Patent Publication Number: US-2022216410-A1

Title: Organic light emitting device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the priority benefit under 35 U.S.C. § 119(a) of Korean Patent Application No. 10-2020-0184940 filed in the Republic of Korea on Dec. 28, 2020, the entire contents of which are expressly incorporated herein by reference in its entirety into the present application. 
     BACKGROUND 
     Technical Field 
     The present disclosure relates to an organic light emitting device, and more specifically, to an organic light emitting device having excellent luminous efficiency and luminous lifespan. 
     Discussion of the Related Art 
     An organic light emitting diode (OLED) among a flat display device used widely has come into the spotlight as a display device replacing rapidly a liquid crystal display device (LCD). The OLED can be formed as a thin organic film less than 2000 Å and can implement unidirectional or bidirectional images by electrode configurations. Also, the OLED can be formed even on a flexible transparent substrate such as a plastic substrate so that a flexible or a foldable display device can be realized with ease using the OLED. In addition, the OLED can be driven at a lower voltage and the OLED has excellent high color purity compared to the LCD. 
     Since fluorescent material uses only singlet exciton energy in the luminous process, the related art fluorescent material shows low luminous efficiency. On the contrary, phosphorescent material can show high luminous efficiency since it uses triplet exciton energy as well as singlet exciton energy in the luminous process. However, metal complex, representative phosphorescent material, has short luminous lifespan for commercial use. Particularly, blue luminous materials have not showed satisfactory luminous efficiency and luminous lifespan compared to other color luminous materials. Therefore, there is a need to develop a new compound or a device structure that can enhance luminous efficiency and luminous lifespan of the organic light emitting diode. 
     SUMMARY 
     Accordingly, embodiments of the present disclosure are directed to an organic light emitting device that substantially obviates one or more of the problems due to the limitations and disadvantages of the related art. 
     An aspect of the present disclosure is to provide an organic light emitting device with improved luminous efficiency and luminous lifespan. 
     Additional features and aspects will be set forth in the description that follows, and in part will be apparent from the description, or can be learned by practice of the inventive concepts provided herein. Other features and aspects of the inventive concept can be realized and attained by the structure particularly pointed out in the written description, or derivable therefrom, and the claims hereof as well as the appended drawings. 
     To achieve these and other aspects of the inventive concepts, as embodied and broadly described herein, an organic light emitting device comprises a substrate; and an organic light emitting diode over the substrate, the organic light emitting diode including a first electrode, a second electrode facing the first electrode and an emissive layer disposed between the first electrode and the second electrode, wherein the emissive layer comprises a first emitting material layer including a first dopant and a first host and a first electron blocking layer disposed between the first electrode and the first emitting material layer, wherein the first dopant includes a boron-based compound having the following structure of Formula 1A or Formula 1B, wherein the first host includes an anthracene-based compound having the following structure of Formula 3, and wherein the first electron blocking layer includes an amine-based compound having the following structure of Formula 5: 
     
       
         
         
             
             
         
       
         
         
           
             wherein each of R 11  to R 14  and each of R 21  to R 24  is independently selected from the group consisting of hydrogen, a C 1 -C 10  alkyl group, a C 6 -C 30  aryl group, a C 6 -C 30  aryl amino group, a C 5 -C 30  hetero aryl group and a C 3 -C 30  alicyclic group, or adjacent two of R 11  to R 14  and R 21  to R 24  form a fused ring, wherein each of the aryl group, the aryl amino group, the hetero aryl group and the alicyclic group of R 11  to R 14  and R 21  to R 24  is independently unsubstituted or substituted with at least one C 1 -C 10  alkyl group; each of R 31  and R 41  is independently selected from the group consisting of hydrogen, a C 1 -C 10  alkyl group, a C 6 -C 30  aryl group, a C 6 -C 30  aryl amino group, a C 5 -C 30  hetero aryl group and a C 3 -C 30  alicyclic group, wherein each of the aryl group, the aryl amino group, the hetero aryl group and the alicyclic group of R 31  and R 41  is independently unsubstituted or substituted with at least one C 1 -C 10  alkyl group; R 51  is selected form the group consisting of hydrogen, a C 1 -C 10  alkyl group, a C 3 -C 15  cyclo alkyl group, a C 6 -C 30  aryl group, a C 6 -C 30  aryl amino group, a C 5 -C 30  hetero aryl group. a C 3 -C 30  alicyclic group and a C 5 -C 30  hetero cyclic group, wherein each of the cyclo alkyl group, the aryl group, the aryl amino group, the hetero aryl group, the alicyclic group and the hetero cyclic group of R 51  is independently unsubstituted or substituted with at least one C 1 -C 10  alkyl group; when each of R 31 , R 41  and R 51  is a C 6 -C 30  aryl group substituted with at least one C 1 -C 10  alkyl group, the substituted alkyl group is linked to each other to form a fused ring; 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             wherein X is NR 1 , CR 2 R 3 , O, S, Se or SiR 4 R 5 , each of R 1  to R 5  is independently selected from the group consisting of hydrogen, a C 1 -C 10  alkyl group, a C 6 -C 30  aryl group, a C 5 -C 30  hetero aryl group and a C 3 -C 30  alicyclic group; each of R 61  to R 64  is independently selected from the group consisting of hydrogen, a C 1 -C 10  alkyl group, a C 6 -C 30  aryl group, a C 6 -C 30  aryl amino group, a C 5 -C 30  hetero aryl group and a C 3 -C 30  alicyclic group, or adjacent two of R 61  to R 64  form a fused ring, wherein each of the aryl group, the aryl amino group, the hetero aryl group and the alicyclic group of R 61  to R 64  is independently unsubstituted or substituted with at least one C 1 -C 10  alkyl group; each of R 71  to R 74  is independently selected from the group consisting of hydrogen, a C 1 -C 10  alkyl group and a C 3 -C 30  alicyclic group; R 81  is selected from the group consisting of a C 6 -C 30  aryl group, a C 5 -C 30  hetero aryl group and a C 3 -C 30  alicyclic group, or R 81  and R 61  form a fused ring, wherein each of the aryl group, the hetero aryl group and the alicyclic group of R 81  is independently unsubstituted or substituted with at least one C 1 -C 10  alkyl group; R 82  is selected from the group consisting of a C 6 -C 30  aryl group, a C 5 -C 30  hetero aryl group and a C 3 -C 30  alicyclic group, wherein each of the aryl group, the hetero aryl group and the alicyclic group of R 82  is independently unsubstituted or substituted with at least one C 1 -C 10  alkyl group; R 91  is selected from the group consisting of hydrogen, a C 1 -C 10  alkyl group, a C 3 -C 15  cyclo alkyl group, a C 6 -C 30  aryl group, a C 6 -C 30  aryl amino group, a C 5 -C 30  hetero aryl group and a C 3 -C 30  alicyclic group, wherein each of the cyclo alkyl group, the aryl group, the aryl amino group, the hetero aryl group and the alicyclic group of R 91  is independently unsubstituted or substituted with at least one C 1 -C 10  alkyl group; when each of R 81 , R 82  and R 91  is a C 6 -C 30  aryl group substituted with at least one C 1 -C 10  alkyl group, the substituted alkyl group is linked to each other to form a fused ring; 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             wherein each of Ar1 and Ar2 is independently a C 6 -C 30  aryl group or a C 5 -C 30  hetero aryl group; L is a single bond, a C 6 -C 20  arylene group or a C 5 -C 20  hetero arylene group; a is an integer of 0 to 8; each of b, c and d is independently an integer of 0 to 30, wherein at least one of a, b, c and d is a positive integer; 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             wherein L 3  is C 6 -C 30  arylene; o is 0 or 1; each of R 121  and R 122  is independently C 6 -C 30  aryl or C 5 -C 30  hetero aryl, wherein each of the C 6 -C 30  aryl and the C 5 -C 30  hetero aryl is optionally substituted with at least one of C 1 -C 10  alkyl and C 6 -C 30  aryl, respectively. 
           
         
       
    
     As an example, each of R 11  to R 14 , R 21  to R 24 , R 31  and R 41  in Formula 1A may be independently selected from the group consisting of hydrogen, a C 1 -C 10  alkyl group, a C 6 -C 30  aryl group and a C 5 -C 30  hetero aryl group, wherein each of the aryl group and the hetero aryl group of R 11  to R 14 , R 21  to R 24 , R 31  and R 41  may be independently unsubstituted or substituted with a C 1 -C 10  alkyl group, wherein R 51  in Formula 1A may be selected from the group consisting of C 1 -C 10  alkyl group, a C 6 -C 30  aryl amino group, a C 5 -C 30  hetero aryl group and a C 3 -C 30  hetero cyclic group, and wherein each of the hetero aryl group, the aryl amino group and the hetero cyclic group of R 51  may be independently unsubstituted or substituted with a C 1 -C 10  alkyl group. 
     Alternatively, X in Formula 1B may be O or S, wherein each of R 61  to R 64  in Formula 1B may be independently selected from the group consisting of hydrogen, a C 1 -C 10  alkyl group and a C 6 -C 30  aryl amino group, or adjacent two of R 61  to R 64  may form fused ring, wherein each of R 71  to R 74  may be independently selected from the group consisting of hydrogen and a C 1 -C 10  alkyl group, wherein R 81  may be selected from the group consisting of a C 6 -C 30  aryl group and a C 5 -C 30  hetero aryl group, or R 81  and R 61  may form a fused ring, wherein each of the aryl group and the hetero aryl group of R 81  may be independently unsubstituted or substituted with a C 1 -C 10  alkyl group, wherein R 82  may be selected from the group consisting of a C 6 -C 30  aryl group and a C 5 -C 30  hetero aryl group, wherein each of the aryl group and the hetero aryl group of R 82  may be independently unsubstituted or substituted with a C 1 -C 10  alkyl group, and wherein R 91  may be a C 1 -C 10  alkyl group. 
     The emissive layer may further comprise a first hole blocking layer disposed between the first emitting material layer and the second electrode. 
     As an example, the first hole blocking layer may comprise at least one of an azine-based compound having the following structure of Formula 7 and a benzimidazole-based compound having the following structure of Formula 9: 
     
       
         
         
             
             
         
       
         
         
           
             wherein each of Y 1  to Y 5  is independently CR 131  or N, one to three of Y 1  to Y 5  is N, and R 131  is a C 6 -C 30  aryl group; L is a C 6 -C 30  arylene group; R 132  is a C 6 -C 30  aryl group or a C 5 -C 30  hetero aryl group, wherein the C 6 -C 30  aryl group is optionally substituted with another C 6 -C 30  aryl or C 5 -C 30  hetero aryl or forms a spiro structure with a C 10 -C 30  fused aryl ring or a C 10 -C 30  fused hetero aryl ring, wherein the another C 6 -C 30  aryl is optionally further substituted with other C 6 -C 30  aryl or C 5 -C 30  hetero aryl or forms a spiro structure with a C 10 -C 30  fused aryl ring; R 133  is hydrogen or adjacent two of R 133  form a fused aromatic ring; r is 0 or 1; s is 1 or 2; and t is an integer of 0 to 4; 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             wherein Ar is C 10 -C 30  arylene; R 141  is a C 6 -C 30  aryl group or a C 5 -C 30  hetero aryl group, each of the C 6 -C 30  aryl group and the C 5 -C 30  hetero aryl group is optionally substituted with C 1 -C 10  alkyl; and each of R 142  and R 143  is independently hydrogen, a C 1 -C 10  alkyl group or a C 6 -C 30  aryl group. 
           
         
       
    
     Alternatively, the emissive layer may further comprise a second emitting material layer disposed between the first emitting material layer and the second electrode and a first charge generation layer disposed between the first and second emitting material layers. 
     The second emitting material layer may include a second dopant and a second host, wherein the second dopant may include the boron-based compound having the structure of Formula 1A or Formula 1B, and wherein the second host may include the anthracene-based compound having the structure of Formula 3. 
     In addition, the emissive layer may further comprise a second electron blocking layer disposed between the first charge generation layer and the second emitting material layer, and wherein the second electron blocking layer may include the amine-based compound having the structure of Formula 5. 
     The emissive layer may further comprise at least one of a first hole blocking layer disposed between the first emitting material layer and the first charge generation layer and a second hole blocking layer disposed between the second emitting material layer and the second electrode. 
     For example, the emissive layer may further comprise a third emitting material layer disposed between the second emitting material layer and the second electrode and a second charge generation layer disposed between the second and third emitting material layers. 
     The substrate may define a red pixel region, a green pixel region and a blue pixel region and the organic light emitting diode may be located correspondingly to the red pixel region, the green pixel region and the blue pixel region, and the organic light emitting device may further comprise a color conversion layer disposed between the substrate and the organic light emitting diode or over the organic light emitting diode correspondingly to the red pixel region and the green pixel region. 
     In one exemplary aspect, the second emitting material layer may emit yellow-green (YG) light or red-green (RG) light. 
     In this case, the substrate may define a red pixel region, a green pixel region and a blue pixel region and the organic light emitting diode may be located correspondingly to the red pixel region, the green pixel region and the blue pixel region, and the organic light emitting device may further comprise a color filter layer disposed between the substrate and the organic light emitting diode or over the organic light emitting diode correspondingly to the red pixel region, the green pixel region and the blue pixel region. 
     It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the inventive concepts as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the disclosure, are incorporated in and constitute a part of this application, illustrate embodiments of the disclosure and together with the description serve to explain various principles of the disclosure. 
         FIG. 1  is a schematic circuit diagram illustrating an organic light emitting display device in accordance with the present disclosure. 
         FIG. 2  is a cross-sectional view illustrating an organic light emitting display device as an example of an organic light emitting device in accordance with one exemplary aspect of the present disclosure. 
         FIG. 3  is a cross-sectional view illustrating an organic light emitting diode having single emitting part in accordance with an exemplary aspect of the present disclosure. 
         FIG. 4  is a cross-sectional view illustrating an organic light emitting diode having a double stack structure in accordance with another exemplary aspect of the present disclosure. 
         FIG. 5  is a cross-sectional view illustrating an organic light emitting display device in accordance with another exemplary aspect of the present disclosure. 
         FIG. 6  is a cross-sectional view illustrating an organic light emitting diode having a double stack structure in accordance with still another exemplary aspect of the present disclosure. 
         FIG. 7  is a cross-sectional view illustrating an organic light emitting diode having a triple stack structure in accordance with still further another exemplary aspect of the present disclosure. 
         FIG. 8  is a cross-section view illustrating an organic light emitting display device in accordance with still another exemplary aspect of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in detail to embodiments of the disclosure, examples of which are illustrated in the accompanying drawings. 
     The organic light emitting diode of the present disclosure can enhance its luminous efficiency and its luminous lifespan by applying particular organic compounds into an emitting material layer, an electron blocking layer and/or a hole blocking layer. The organic light emitting diode can be applied into an organic light emitting device such as an organic light emitting display device or an organic light emitting illumination device. 
       FIG. 1  is a schematic circuit diagram illustrating an organic light emitting display device of the present disclosure. As illustrated in  FIG. 1 , a gate line GL, a data line DL and power line PL, each of which cross each other to define a pixel region P, are formed in the organic light emitting display device. A switching thin film transistor Ts, a driving thin film transistor Td, a storage capacitor Cst and an organic light emitting diode D are formed within the pixel region P. The pixel region P may include a red (R) pixel region, a green (G) pixel region and a blue (B) pixel region. 
     The switching thin film transistor Ts is connected to the gate line GL and the data line DL, and the driving thin film transistor Td and the storage capacitor Cst are connected between the switching thin film transistor Ts and the power line PL. The organic light emitting diode D is connected to the driving thin film transistor Td. When the switching thin film transistor Ts is turned on by a gate signal applied into the gate line GL, a data signal applied into the data line DL is applied into a gate electrode of the driving thin film transistor Td and one electrode of the storage capacitor Cst through the switching thin film transistor Ts. 
     The driving thin film transistor Td is turned on by the data signal applied into the gate electrode so that a current proportional to the data signal is supplied from the power line PL to the organic light emitting diode D through the driving thin film transistor Td. And then, the organic light emitting diode D emits light having a luminance proportional to the current flowing through the driving thin film transistor Td. In this case, the storage capacitor Cst is charge with a voltage proportional to the data signal so that the voltage of the gate electrode in the driving thin film transistor Td is kept constant during one frame. Therefore, the organic light emitting display device can display a desired image. 
       FIG. 2  is a schematic cross-sectional view illustrating an organic light emitting display device in accordance with an exemplary aspect of the present disclosure. As illustrated in  FIG. 2 , the organic light emitting display device  100  comprises a substrate  102 , a thin-film transistor Tr over the substrate  102 , and an organic light emitting diode D connected to the thin film transistor Tr. As an example, the substrate  102  defines a red pixel region, a green pixel region and a blue pixel region and the organic light emitting diode D is located in each pixel region. In other words, the organic light emitting diode D, each of which emits red, green or blue (B) light, is located correspondingly in the red pixel region, the green pixel region and the blue pixel region. 
     The substrate  102  may include, but is not limited to, glass, thin flexible material and/or polymer plastics. For example, the flexible material may be selected from, but is not limited to, polyimide (PI), polyethersulfone (PES), polyethylenenaphthalate (PEN), polyethylene terephthalate (PET), polycarbonate (PC) and combination thereof. The substrate  102 , over which the thin film transistor Tr and the organic light emitting diode D are arranged, forms an array substrate. 
     A buffer layer  106  may be disposed over the substrate  102 , and the thin film transistor Tr is disposed over the buffer layer  106 . The buffer layer  106  may be omitted. 
     A semiconductor layer  110  is disposed over the buffer layer  106 . In one exemplary aspect, the semiconductor layer  110  may include, but is not limited to, oxide semiconductor materials. In this case, a light-shield pattern may be disposed under the semiconductor layer  110 , and the light-shield pattern can prevent light from being incident toward the semiconductor layer  110 , and thereby, preventing the semiconductor layer  110  from being deteriorated by the light. Alternatively, the semiconductor layer  110  may include polycrystalline silicon. In this case, opposite edges of the semiconductor layer  110  may be doped with impurities. 
     A gate insulating layer  120  including an insulating material is disposed on the semiconductor layer  110 . The gate insulating layer  120  may include, but is not limited to, an inorganic insulating material such as silicon oxide (SiO x ) or silicon nitride (SiN x ). 
     A gate electrode  130  made of a conductive material such as a metal is disposed over the gate insulating layer  120  so as to correspond to a center of the semiconductor layer  110 . While the gate insulating layer  120  is disposed over a whole area of the substrate  102  in  FIG. 2 , the gate insulating layer  120  may be patterned identically as the gate electrode  130 . 
     An interlayer insulating layer  140  including an insulating material is disposed on the gate electrode  130  with covering over an entire surface of the substrate  102 . The interlayer insulating layer  140  may include an inorganic insulating material such as silicon oxide (SiO x ) or silicon nitride (SiN x ), or an organic insulating material such as benzocyclobutene or photo-acryl. 
     The interlayer insulating layer  140  has first and second semiconductor layer contact holes  142  and  144  that expose both sides of the semiconductor layer  110 . The first and second semiconductor layer contact holes  142  and  144  are disposed over opposite sides of the gate electrode  130  with spacing apart from the gate electrode  130 . The first and second semiconductor layer contact holes  142  and  144  are formed within the gate insulating layer  120  in  FIG. 2 . Alternatively, the first and second semiconductor layer contact holes  142  and  144  are formed only within the interlayer insulating layer  140  when the gate insulating layer  120  is patterned identically as the gate electrode  130 . 
     A source electrode  152  and a drain electrode  154 , which are made of conductive material such as a metal, are disposed on the interlayer insulating layer  140 . The source electrode  152  and the drain electrode  154  are spaced apart from each other with respect to the gate electrode  130 , and contact both sides of the semiconductor layer  110  through the first and second semiconductor layer contact holes  142  and  144 , respectively. 
     The semiconductor layer  110 , the gate electrode  130 , the source electrode  152  and the drain electrode  154  constitute the thin film transistor Tr, which acts as a driving element. The thin film transistor Tr in  FIG. 2  has a coplanar structure in which the gate electrode  130 , the source electrode  152  and the drain electrode  154  are disposed over the semiconductor layer  110 . Alternatively, the thin film transistor Tr may have an inverted staggered structure in which a gate electrode is disposed under a semiconductor layer and a source and drain electrodes are disposed over the semiconductor layer. In this case, the semiconductor layer may include amorphous silicon. 
     Although not shown in  FIG. 2 , a gate line and a data line, which cross each other to define a pixel region, and a switching element, which is connected to the gate line and the data line, is may be further formed in the pixel region. The switching element is connected to the thin film transistor Tr, which is a driving element. In addition, a power line is spaced apart in parallel from the gate line or the data line, and the thin film transistor Tr may further include a storage capacitor configured to constantly keep a voltage of the gate electrode for one frame. 
     A passivation layer  160  is disposed on the source and drain electrodes  152  and  154  with covering the thin film transistor Tr over the whole substrate  102 . The passivation layer  160  has a flat top surface and a drain contact hole  162  that exposes the drain electrode  154  of the thin film transistor Tr. While the drain contact hole  162  is disposed on the second semiconductor layer contact hole  144 , it may be spaced apart from the second semiconductor layer contact hole  144 . 
     The organic light emitting diode (OLED) D includes a first electrode  210  that is disposed on the passivation layer  160  and connected to the drain electrode  154  of the thin film transistor Tr. The organic light emitting diode D further includes an emissive layer  230  and a second electrode  220  each of which is disposed sequentially on the first electrode  210 . 
     The first electrode  210  is disposed in each pixel region. The first electrode  210  may be an anode and include conductive material having relatively high work function value. For example, the first electrode  210  may include, but is not limited to, a transparent conductive oxide (TCO). Particularly, the first electrode  210  may include indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), SnO, ZnO, indium cerium oxide (ICO), aluminum doped zinc oxide (AZO), and the like. 
     In one exemplary aspect, when the organic light emitting display device  100  is a bottom-emission type, the first electrode  210  may have a single-layered structure of TCO. Alternatively, when the organic light emitting display device  100  is a top-emission type, a reflective electrode or a reflective layer may be disposed under the first electrode  210 . For example, the reflective electrode or the reflective layer may include, but is not limited to, silver (Ag) or aluminum-palladium-copper (APC) alloy. In the organic light emitting display device  100  of the top-emission type, the first electrode  210  may have a triple-layered structure of ITO/Ag/ITO or ITO/APC/ITO. 
     In addition, a bank layer  164  is disposed on the passivation layer  160  in order to cover edges of the first electrode  210 . The bank layer  164  exposes a center of the first electrode  210 . The bank layer  164  may be omitted. 
     An emissive layer  230  is disposed on the first electrode  210 . In one exemplary embodiment, the emissive layer  230  may have a mono-layered structure of an emitting material layer (EML). Alternatively, the emissive layer  230  may have a multiple-layered structure of a hole injection layer (HIL), a hole transport layer (HTL), an electron blocking layer (EBL), an EML, a hole blocking layer (HBL), an electron transport layer (ETL) and/or an electron injection layer (EIL), as illustrated in  FIGS. 3 and 4 . The emissive layer  230  may have a single emitting part or may have multiple emitting parts to form a tandem structure. 
     The emissive layer  230  may include at least one emitting material layer including an anthracene-based compound in which at least one hydrogen atom is deuterated and a boron-based compound in the blue pixel region, and at least one electron blocking layer including an aryl amine-based compound. Alternatively, the emissive layer  230  may further comprise at least one hole blocking layer including at least one of an azine-based compound and a benzimidazole-based compound. The emissive layer  230  enables the OLED D and the organic light emitting display device  100  to improve their luminous efficiency and luminous lifespan considerably. 
     The second electrode  220  is disposed over the substrate  102  above which the emissive layer  230  is disposed. The second electrode  220  may be disposed over a whole display area, and may include a conductive material with a relatively low work function value compared to the first electrode  210 , and may be a cathode. For example, the second electrode  220  may include, but is not limited to, high-reflective material such as aluminum (Al), magnesium (Mg), calcium (Ca), silver (Ag), alloy thereof or combination thereof such as aluminum-magnesium alloy (Al—Mg). When the organic light emitting display device  100  is a top-emission type, the second electrode  220  is thin so that it has light transmissive (semi-transmissive) property. 
     In addition, an encapsulation film  170  may be disposed over the second electrode  220  in order to prevent outer moisture from penetrating into the organic light emitting diode D. The encapsulation film  170  may have, but is not limited to, a laminated structure of a first inorganic insulating film  172 , an organic insulating film  174  and a second inorganic insulating film  176 . The encapsulation film  170  may be omitted. 
     The organic light emitting display device  100  may further include a polarizing plate to reduce reflection of external light. For example, the polarizing plate may be a circular polarizing plate. When the organic light emitting display device  100  is a bottom-emission type, the polarizing plate may be located under the substrate  102 . Alternatively, when the organic light emitting display device  100  is a top-emission type, the polarizing plate may be attached onto the encapsulation film  170 . Further, a cover window may be attached onto the encapsulation film  170  or the polarizing plate in the organic light emitting display device  100  of the top-emission type. In this case, the substrate  102  and the cover window have flexible properties so that a flexible display device can be constructed. 
     As described above, the emissive layer  230  in the organic light emitting diode D includes particular compounds so that the organic light emitting diode D can enhance its luminous efficiency and its luminous lifespan.  FIG. 3  is a schematic cross-sectional view illustrating an organic light emitting diode having a single emitting part in accordance with an exemplary embodiment of the present disclosure. 
     As illustrated in  FIG. 3 , the organic light emitting diode (OLED) D1 in accordance with the first embodiment of the present disclosure includes first and second electrodes  210  and  220  facing each other and an emissive layer  230  disposed between the first and second electrodes  210  and  220 . In an exemplary embodiment, the emissive layer  230  includes an EML  340 , which may be a first EML, disposed between the first and second electrodes  210  and  220  and an EBL  330 , which may be a first EBL, disposed between the first electrode  210  and the EML  340 . Alternatively, the emissive layer  230  may further include a HBL  350 , which may be a first HBL, disposed between the EML  340  and the second electrode  220 . 
     In addition, the emissive layer  230  may further include an HIL  310  disposed between the first electrode  210  and the EBL  330  and an HTL  320  disposed between the HIL  310  and the EBL  330 . In addition, the emissive layer  230  may further include an EIL  360  disposed between the HBL  350  and the second electrode  220 . In an alternative embodiment, the emissive layer  230  may further include an ETL disposed between the HBL  350  and the EIL  360 . The organic light emitting display device  100  ( FIG. 2 ) includes a red pixel region, a green pixel region and a blue pixel region, and the OLED D1 may be located in the blue pixel region. 
     One of the first and second electrodes  210  and  220  may be an anode and the other of the first and second electrodes  210  and  220  may be a cathode. Also, one of the first and second electrodes  210  and  220  may be a transmissive (semi-transmissive) electrode and the other of the first and second electrodes  210  and  220  may be a reflective electrode. For example, each of the first and second electrodes  210  and  220  may have a thickness of, but is not limited to, about 30 nm to about 300 nm. 
     The EML  340  includes a dopant  342 , which may be a first dopant, of a boron-based compound and a host  344 , which may be a first host, of an anthracene-based compound so that the EML  340  emits blue (B) light. In this case, the dopant  342  of the boron-based compound may not be deuterated or may be partially deuterated, while at least one hydrogen atoms in the host  344  of the anthracene-based compound may be deuterated. Namely, the host  344  in the EML  340  may be partially or fully deuterated, while the dopant  342  may not be deuterated or may be partially deuterated. The dopant  342  of the boron-based compound may have the following structure of Formula 1A or Formula 1B: 
     
       
         
         
             
             
         
       
         
         
           
             wherein each of R 11  to R 14  and each of R 21  to R 24  is independently selected from the group consisting of hydrogen, a C 1 -C 10  alkyl group, a C 6 -C 30  aryl group, a C 6 -C 30  aryl amino group, a C 5 -C 30  hetero aryl group and a C 3 -C 30  alicyclic group, or adjacent two of R 11  to R 14  and R 21  to R 24  form a fused ring, wherein each of the aryl group, the aryl amino group, the hetero aryl group and the alicyclic group of R 11  to R 14  and R 21  to R 24  is independently unsubstituted or substituted with at least one C 1 -C 10  alkyl group; each of R 31  and R 41  is independently selected from the group consisting of hydrogen, a C 1 -C 10  alkyl group, a C 6 -C 30  aryl group, a C 6 -C 30  aryl amino group, a C 5 -C 30  hetero aryl group and a C 3 -C 30  alicyclic group, wherein each of the aryl group, the aryl amino group, the hetero aryl group and the alicyclic group of R 31  and R 41  is independently unsubstituted or substituted with at least one C 1 -C 10  alkyl group; R 51  is selected form the group consisting of hydrogen, a C 1 -C 10  alkyl group, a C 3 -C 15  cyclo alkyl group, a C 6 -C 30  aryl group, a C 6 -C 30  aryl amino group, a C 5 -C 30  hetero aryl group. a C 3 -C 30  alicyclic group and a C 5 -C 30  hetero cyclic group, wherein each of the cyclo alkyl group, the aryl group, the aryl amino group, the hetero aryl group, the alicyclic group and the hetero cyclic group of R 51  is independently unsubstituted or substituted with at least one C 1 -C 10  alkyl group; when each of R 31 , R 41  and R 51  is a C 6 -C 30  aryl group substituted with at least one C 1 -C 10  alkyl group, the substituted alkyl group is linked to each other to form a fused ring. 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             wherein X is NR 1 , CR 2 R 3 , O, S, Se or SiR 4 R 5 , each of R 1  to R 5  is independently selected from the group consisting of hydrogen, a C 1 -C 10  alkyl group, a C 6 -C 30  aryl group, a C 5 -C 30  hetero aryl group and a C 3 -C 30  alicyclic group; each of R 61  to R 64  is independently selected from the group consisting of hydrogen, a C 1 -C 10  alkyl group, a C 6 -C 30  aryl group, a C 6 -C 30  aryl amino group, a C 5 -C 30  hetero aryl group and a C 3 -C 30  alicyclic group, or adjacent two of R 61  to R 64  form a fused ring, wherein each of the aryl group, the aryl amino group, the hetero aryl group and the alicyclic group of R 61  to R 64  is independently unsubstituted or substituted with at least one C 1 -C 10  alkyl group; each of R 71  to R 74  is independently selected from the group consisting of hydrogen, a C 1 -C 10  alkyl group and a C 3 -C 30  alicyclic group; R 81  is selected from the group consisting of a C 6 -C 30  aryl group, a C 5 -C 30  hetero aryl group and a C 3 -C 30  alicyclic group, or R 81  and R 61  form a fused ring, wherein each of the aryl group, the hetero aryl group and the alicyclic group of R 81  is independently unsubstituted or substituted with at least one C 1 -C 10  alkyl group; R 82  is selected from the group consisting of a C 6 -C 30  aryl group, a C 5 -C 30  hetero aryl group and a C 3 -C 30  alicyclic group, wherein each of the aryl group, the hetero aryl group and the alicyclic group of R 82  is independently unsubstituted or substituted with at least one C 1 -C 10  alkyl group; R 91  is selected from the group consisting of hydrogen, a C 1 -C 10  alkyl group, a C 3 -C 15  cyclo alkyl group, a C 6 -C 30  aryl group, a C 6 -C 30  aryl amino group, a C 5 -C 30  hetero aryl group and a C 3 -C 30  alicyclic group, wherein each of the cyclo alkyl group, the aryl group, the aryl amino group, the hetero aryl group and the alicyclic group of R 91  is independently unsubstituted or substituted with at least one C 1 -C 10  alkyl group; when each of R 81 , R 82  and R 91  is a C 6 -C 30  aryl group substituted with at least one C 1 -C 10  alkyl group, the substituted alkyl group is linked to each other to form a fused ring. 
           
         
       
    
     As an example, each of R 11  to R 14 , R 21  to R 24 , R 31  and R 41  in Formula 1A may be independently selected from the group consisting of hydrogen, a C 1 -C 10  alkyl group, a C 6 -C 30  aryl group and a C 5 -C 30  hetero aryl group, wherein each of the aryl group and the hetero aryl group of R 11  to R 14 , R 21  to R 24 , R 31  and R 41  may be independently unsubstituted or substituted with a C 1 -C 10  alkyl group, and R 51  in Formula 1A may be selected from the group consisting of C 1 -C 10  alkyl group, a C 6 -C 30  aryl amino group, a C 5 -C 30  hetero aryl group and a C 3 -C 30  hetero cyclic group, and wherein each of the hetero aryl group, the aryl amino group and the hetero cyclic group of R 51  may be independently unsubstituted or substituted with a C 1 -C 10  alkyl group. 
     For example, one of R 11  to R 14  and/or one of R 21  to R 24  may be a C 1 -C 10  alkyl group and the rest of R 11  to R 14  and/or the rest of R 21  to R 24  may be hydrogen, and each of R 31  and R 41  may be independently phenyl substituted with a C 1 -C 10  alkyl group or a dibenzofuranyl substituted with a C 1 -C 10  alkyl group in Formula 1A. R 51  in Formula 1A may be a C 1 -C 10  alkyl group, a diphenyl amino group, a hetero aryl group including nitrogen atom or a hetero cyclic group including a nitrogen atom. In this case, the alkyl group may be, but is not limited to, tert-butyl. In addition, the fused ring formed by adjacent groups may be, but is not limited to, a C 3 -C 10  alicyclic ring. 
     Alternatively, X in Formula 1B may be O or S, each of R 61  to R 64  in Formula 1B may be independently selected from the group consisting of hydrogen, a C 1 -C 10  alkyl group and a C 6 -C 30  aryl amino group, or adjacent two of R 61  to R 64  may form a fused ring, each of R 71  to R 74  may be independently selected from the group consisting of hydrogen and a C 1 -C 10  alkyl group, R 81  may be selected from the group consisting of a C 6 -C 30  aryl group and a C 5 -C 30  hetero aryl group, or R 81  and R 61  may form a fused ring, wherein each of the aryl group and the hetero aryl group of R 81  may be independently unsubstituted or substituted with a C 1 -C 10  alkyl group, R 82  may be selected from the group consisting of a C 6 -C 30  aryl group and a C 5 -C 30  hetero aryl group, wherein each of the aryl group and the hetero aryl group of R 82  may be independently unsubstituted or substituted with a C 1 -C 10  alkyl group, and wherein R 91  may be a C 1 -C 10  alkyl group. 
     For example, X in Formula 1B may be O. Each of R 61  to R 64  may be independently selected from the group consisting of protium, deuterium, a C 1 -C 10  alkyl group and a diphenyl amino group, or adjacent two of R 61  to R 64  may form a fused ring, and the diphenyl amino group or the fused group may be deuterated. Each of R 71  to R 74  may be independently selected from the group consisting of protium, deuterium and a C 1 -C 10  alkyl group. Each of R 81  and R 82  may be independently selected from the group consisting of phenyl and dibenzofuranyl each of which may be independently unsubstituted or substituted with deuterium and/or a C 1 -C 10  alkyl group. R 91  may be a C 1 -C 10  alkyl group such as tert-butyl, but is not limited thereto. 
     Alternatively, R 73  may be a C 1 -C 10  alkyl group and each of R 71 , R 72  and R 74  may be independently protium or deuterium in Formula 1B. For example, in the boron-based compound having the structure of Formula 1B, at least one protium linked to the aromatic ring and the heteroaromatic ring other than the aromatic ring linked to boron atom and two nitrogen atoms and the aromatic rings fused by those hetero aromatic rings may be substituted with deuterium. Namely, R 91  in Formula 1B may not be deuterated. 
     For example, the dopant  342  of the boron-based compound may be selected from, but is not limited to, the following compounds of Formula 2: 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     In another exemplary aspect, the host  344  of the anthracene-based compound may have the following structure of Formula 3: 
     
       
         
         
             
             
         
       
         
         
           
             wherein each of Ar1 and Ar2 is independently a C 6 -C 30  aryl group or a C 5 -C 30  hetero aryl group; L is a single bond, a C 6 -C 20  arylene group or a C 5 -C 20  hetero arylene group; a is an integer of 0 to 8; each of b, c and d is independently an integer of 0 to 30, wherein at least one of a, b, c and d is a positive integer. 
           
         
       
    
     As an example, each of Ar1 and Ar2 may be independently phenyl, naphthyl, dibenzofuranyl or a fused dibenzofuranyl and L may be a single bond, phenylene or dibenzofuranylene in Formula 3. For example, Ar1 may be naphthyl, dibenzofuranyl or fused dibenzofuranyl and Ar2 may be phenyl or naphthyl in Formula 3. Alternatively, both Ar1 and Ar2 may be naphthyl and L may be a single bond, phenylene or dibenzofuranylene. 
     Particularly, 1-naphtyl moiety is linked directly to the anthracene moiety, 2-naphthyl moiety is linked directly or via phenylene linker (bridging group) to the anthracene moiety, and at least one protium, for example, all protiums, in the molecule may be deuterated. 
     For example, the host  344  of the anthracene-based compound may be selected from, but is not limited to, the following compound of Formula 4. 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     In one exemplary embodiment, the contents of the host  344  may be about 70 wt % to about 99.9 wt % and the contents of the dopant  342  may be about 0.1 wt % to about 30 wt % in the EML  340 . For example, the contents of the dopant  342  in the EML  340  may be about 0.1 wt % to about 10 wt %, for example, about 1 wt % to about 5 wt % so that the EML  340  may implement sufficient luminous efficiency and luminous lifespan. The EML  340  may have a thickness of, but is not limited to, about 10 nm to about 200 nm, for example, about 20 nm to about 100 nm or about 20 nm to about 50 nm. 
     The EML  340  includes the dopant  342  of the boron-based compound and the host  344  of the anthracene-based compound substituted with at least one deuterium so that the OLED D1 and the organic light emitting display device  100  can improve their luminous efficiency and luminous lifespan. When the dopant  342  of the boron-based compound has an asymmetric chemical structure such as Formula 1B, the OLED D1 and the organic light emitting display device  100  can improve their luminous efficiency and luminous lifespan significantly. 
     In addition, when the EML  340  includes the dopant  342  where a part of or all protiums linked to the aromatic rings and the heteroaromatic rings other than the aromatic ring linked to boron atom and two nitrogen atoms may be substituted with deuterium, the OLED D1 and the organic light emitting display device  100  can improve further their luminous efficiency and luminous lifespan. 
     Moreover, when the EML  340  includes the host  344  of the anthracene-based compound where two naphthyl moieties are linked to directly or via a linker to the anthracene moiety and at least one, for example all protiums are deuterated, the luminous efficiency and the luminous lifespan of the OLED D1 and the organic light emitting display device  100  can be further enhanced. 
     The HIL  310  is disposed between the first electrode  210  and the HTL  320  and improves an interface property between the inorganic first electrode  210  and the organic HTL  320 . In one exemplary embodiment, the HIL  310  may include a hole injection material selected from, but is not limited to, the group consisting of 4,4′4″-Tris(3-methylphenylamino)triphenylamine (MTDATA), 4,4′,4″-Tris(N,N-diphenyl-amino)triphenylamine (NATA), 4,4′,4″-Tris(N-(naphthalene-1-yl)-N-phenyl-amino)triphenylamine (1T-NATA), 4,4′,4″-Tris(N-(naphthalene-2-yl)-N-phenyl-amino)triphenylamine (2T-NATA), Copper phthalocyanine (CuPc), Tris(4-carbazoyl-9-yl-phenyl)amine (TCTA), N,N′-Diphenyl-N,N′-bis(1-naphthyl)-1,1′-biphenyl-4,4″-diamine (NPB; NPD), 1,4,5,8,9,11-Hexaazatriphenylenehexacarbonitrile (Dipyrazino[2,3-f:2′3′-h]quinoxaline-2,3,6,7,10,11-hexacarbonitrile; HAT-CN), 1,3,5-tris[4-(diphenylamino)phenyl]benzene (TDAPB), poly(3,4-ethylenedioxythiphene)polystyrene sulfonate (PEDOT/PSS), 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ), N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine and combination thereof. 
     Alternatively, the HIL  340  may comprise a hole injection host and a hole injection dopant. As an example, the hole injection host may comprise a spirofluorene-based compound having the following structure of Formula 11 and the hole injection dopant may comprise a radialene-based compound having the following structure of Formula 12, but is not limited thereto. 
     
       
         
         
             
             
         
       
     
     When the HIL  310  includes the hole injection host and the hole injection dopant, the contents of the hole injection dopant in the HIL  310  may be, but is not limited to, about 1 wt % to about 50 wt %, for example, about 1 wt % to about 30 wt %. The HIL  310  may be omitted in compliance of the OLED D1 property. 
     The HTL  320  is disposed between the HIL  310  and the EBL  330 . In one exemplary embodiment, the HTL  320  may include a hole transport material selected from, but is not limited to, N,N′-Diphenyl-N,N′-bis(3-methylphenyl-1,1′-biphenyl-4,4′-diamine (TPD), NPB (NPD), N,N′-bis[4-[bis(3-methylphenyl)amino]phenyl]-N,N′-diphenyl-[1,1′-biphenyl]-4,4′-diamine (DNTPD), 4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP), Poly[N,N′-bis(4-butylphenyl)-N,N′-bis(phenyl)-benzidine] (Poly-TPD), Poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(4,4′-(N-(4-sec-butylphenyl)diphenylamine))] (TFB), 1,1-bis(4-(N,N′-di(p-tolyl)amino)phenyl)cyclohexane (TAPC), 3,5-Di(9H-carbazol-9-yl)-N,N-diphenylaniline (DCDPA), N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine, N-(biphenyl-4-yl)-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)biphenyl-4-amine, N-([1,1′-Biphenyl]-4-yl)-9,9-dimethyl-N-(4-(9-phenl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine, N4,N4,N4′,N4′-tetrakis([1,1′-biphenyl]-4-yl)-[1,1′-biphenyl]-4,4′-diamine and/or the spirofluorene-based compound having the structure of Formula 11. 
     In an exemplary embodiment, each of the HIL  310  and the HTL  320  may independently have a thickness of, but is not limited to, about 5 nm to about 200 nm, for example, about 5 nm to about 100 nm. 
     The EBL  330  prevents electrons from transporting from the EML  340  to the first electrode  210 . The EBL  330  may include an electron blocking material  332  of a spiroaryl amine-based compound having the following structure of Formula 5: 
     
       
         
         
             
             
         
       
         
         
           
             wherein L 3  is C 6 -C 30  arylene; o is 0 or 1; each of R 121  and R 122  is independently C 6 -C 30  aryl or C 5 -C 30  hetero aryl, wherein each of the C 6 -C 30  aryl and the C 5 -C 30  hetero aryl is optionally substituted with at least one of C 1 -C 10  alkyl and C 6 -C 30  aryl, respectively. 
           
         
       
    
     As an example, L 3  may be phenylene and each of R 121  to R 122  may be independently unsubstituted or substituted with at least one of C 1 -C 10  alkyl and C 6 -C 30  aryl (e.g. phenyl), and may be selected from the group consisting of phenyl, biphenyl, fluorenyl, carbazolyl, phenyl carbazolyl, carbazolyl phenyl, dibenzofuranyl and dibenzothiophenyl. 
     For example, the electron blocking material  332  may be selected from any spiroaryl amine-based compounds having the following structure of Formula 6: 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     Alternatively, the OLED D1 may further include the HBL  350  which prevents holes from transporting from the EML  340  to the second electrode  220 . As an example, the HBL  350  may include a hole blocking material  352  of an azine-based compound having the following structure of Formula 7 and/or a benzimidazole-based compound having the following structure of Formula 9. 
     
       
         
         
             
             
         
       
         
         
           
             wherein each of Y 1  to Y 5  is independently CR 131  or N, one to three of Y 1  to Y 5  is N, and R 131  is a C 6 -C 30  aryl group; L is a C 6 -C 30  arylene group; R 132  is a C 6 -C 30  aryl group or a C 5 -C 30  hetero aryl group, wherein the C 6 -C 30  aryl group is optionally substituted with another C 6 -C 30  aryl or C 5 -C 30  hetero aryl or forms a spiro structure with a C 10 -C 30  fused aryl ring or a C 10 -C 30  fused hetero aryl ring, wherein the another C 6 -C 30  aryl is optionally further substituted with other C 6 -C 30  aryl or C 5 -C 30  hetero aryl or forms a spiro structure with a C 10 -C 30  fused aryl ring; R 133  is hydrogen or adjacent two of R 133  form a fused aromatic ring; r is 0 or 1; s is 1 or 2; and t is an integer of 0 to 4; 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             wherein Ar is C 10 -C 30  arylene; R 141  is a C 6 -C 30  aryl group or a C 5 -C 30  hetero aryl group, each of the C 6 -C 30  aryl group and the C 5 -C 30  hetero aryl group is optionally substituted with C 1 -C 10  alkyl; and each of R 142  and R 143  is independently hydrogen, a C 1 -C 10  alkyl group or a C 6 -C 30  aryl group. 
           
         
       
    
     In one exemplary embodiment, the aryl group constituting R 132  in Formula 7 may be unsubstituted or substituted further with another C 6 -C 30  aryl group or C 5 -C 30  hetero aryl group, or form a spiro structure with other fused aryl ring or fused hetero aryl ring. For example, the aryl or the hetero aryl group that may be substituted to R 132  may be a C 10 -C 30  fused aryl group or a C 10 -C 30  fused hetero aryl group. R 133  in Formula 7 may be fused to form a naphthyl group. In one exemplary embodiment, the azine-based compound as the hole blocking material  352  may be selected from any azine-based compounds having the following structure of Formula 8: 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     As an example, “Ar” in Formula 9 may be a naphthylene group or an anthracenylene group, R 141  in Formula 9 may be a phenyl group or a benzimidazole group, R 142  in Formula 9 may be a methyl group, an ethyl group or a phenyl group and R 143  in Formula 9 may be hydrogen, a methyl group or a phenyl group. In one exemplary embodiment, the benzimidazole compound as the hole blocking material  352  may be selected from any benzimidazole-based compounds having the following structure of Formula 10. 
     
       
         
         
             
             
         
       
     
     In an exemplary embodiment, each of the EBL  330  and the HBL  350  may independently have a thickness of, but is not limited to, about 5 nm to about 200 nm, for example, about 5 nm to about 100 nm. 
     The compound having the structure of Formulae 7 to 10 has good electron transport property as well as excellent hole blocking property. Accordingly, the HBL  350  including the compound having the structure of Formulae 7 to 10 may function as a hole blocking layer and an electron transport layer. 
     In an alternative embodiment, the OLED D1 may further include an ETL disposed between the HBL  350  and the EIL  360 . In one exemplary embodiment, the ETL may include, but is not limited to, oxadiazole-based compounds, triazole-based compounds, phenanthroline-based compounds, benzoxazole-based compounds, benzothiazole-based compounds, benzimidazole-based compounds, triazine-based compounds, and the like. 
     Particularly, the ETL may include an electron transport material selected from, but is not limited to, the group consisting of tris-(8-hydroxyquinoline) aluminum (Alq 3 ), 2-biphenyl-4-yl-5-(4-t-butylphenyl)-1,3,4-oxadiazole (PBD), spiro-PBD, lithium quinolate (Liq), 1,3,5-Tris(N-phenylbenzimidazol-2-yl)benzene (TPBi), Bis(2-methyl-8-quinolinolato-N1,O8)-(1,1′-biphenyl-4-olato)aluminum (BAlq), 4,7-diphenyl-1,10-phenanthroline (Bphen), 2,9-Bis(naphthalene-2-yl)4,7-diphenyl-1,10-phenanthroline (NBphen), 2,9-Dimethyl-4,7-diphenyl-1,10-phenathroline (BCP), 3-(4-Biphenyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole (TAZ), 4-(Naphthalen-1-yl)-3,5-diphenyl-4H-1,2,4-triazole (NTAZ), 1,3,5-Tri(p-pyrid-3-yl-phenyl)benzene (TpPyPB), 2,4,6-Tris(3′-(pyridin-3-yl)biphenyl-3-yl)1,3,5-triazine (TmPPPyTz), Poly[9,9-bis(3′-(N,N-dimethyl)-N-ethylammonium)-propyl)-2,7-fluorene]-alt-2,7-(9,9-dioctylfluorene)] (PFNBr), tris(phenylquinoxaline) (TPQ), Diphenyl-4-triphenylsilyl-phenylphosphine oxide (TSPO1), 2-[4-(9,10-Di-2-naphthalenyl-2-anthracenyl)phenyl]-1-phenyl-1H-benzimdazole (ZADN), 1,3-bis(9-phenyl-1,10-phenathrolin-2-yl)benzene, 1,4-bis(2-phenyl-1,10-phenanthrolin-4-yl)benzene (p-bPPhenB) and/or 1,3-bis(2-phenyl-1,10-phenanthrolin-4-yl)benzene (m-bPPhenB). 
     The EIL  360  is disposed between the HBL  350  and the second electrode  220 , and can improve physical properties of the second electrode  320  and therefore, can enhance the life span of the OLED D1. In one exemplary embodiment, the EIL  360  may include, but is not limited to, an alkali metal halide or alkaline earth metal halide such as LiF, CsF, NaF, BaF 2  and the like, and/or an organic metal compound such as Liq, lithium benzoate, sodium stearate, and the like. 
     In an alternative embodiment, the EIL  360  may be an organic layer doped with the alkali metal such as Li, Na, K and/or Cs and/or the alkaline earth metal such as Mg, Sr, Ba and/or Ra. An organic host used in the EIL  360  may be the electron transport material and the contents of the alkali metal and/or the alkaline earth metal in the EIL  360  may be, but is not limited to, about 1 wt % to about 30 wt %. For example, the EIL  360  may include an electron transport material having the following structure of Formula 13: 
     
       
         
         
             
             
         
       
     
     As an example, each of the ETL and the EIL  360  may independently have a thickness of, but is not limited to, about 10 nm to about 200 nm, for example, about 10 nm to 100 nm. 
     The OLED D1 can maximize its luminous efficiency and luminous lifespan by applying the dopant  342  of the boron-based compound having the structure of Formulae 1A to 2 and the host  344  of the anthracene-based compound having the structure of Formulae 3 to 4 into the EML  340 , the aryl amine-based compound having the structure of Formulae 5 and 6 into the EBL  330 , and optionally the azine-based compound having the structure of Formulae 7 to 8 and/or the benzimidazole-based compound having the structure of Formulae 9 to 10 into the HBL  350 . 
     In the first exemplary embodiment, the OLED D1 may have single emitting part. An OLED in accordance with the present disclosure may have a tandem structure including multiple emitting parts.  FIG. 4  is a schematic cross-sectional view illustrating an organic light emitting diode having two emitting parts in accordance with another exemplary embodiment of the present disclosure. 
     As illustrated in  FIG. 4 , the OLED D2 in accordance with the second embodiment of the present disclosure includes first and second electrodes  210  and  220  facing each other and an emissive layer  230 A disposed between the first and second electrodes  210  and  220 . The emissive layer  230 A includes a first emitting part  400  disposed between the first electrode  210  and the second electrode  220 , a second emitting part  500  disposed between the first emitting part  400  and the second electrode  220  and a charge generation layer (CGL)  470  disposed between the first and second emitting parts  400  and  500 . The organic light emitting display device  100  ( FIG. 2 ) includes the red pixel region, the green pixel region and the blue pixel region, and the OLED D2 may be located in the blue pixel region. 
     One of the first and second electrodes  210  and  220  may be an anode and the other of the first and second electrodes  210  and  220  may be a cathode. Also, one of the first and second electrodes  210  and  220  may be a transmissive (semi-transmissive) electrode and the other of the first and second electrodes  210  and  220  may be a reflective electrode. 
     The first emitting part  400  includes a first emitting material layer (EML 1 )  440  disposed between the first electrode  210  and the CGL  470 . The first emitting part  400  may include a first electron blocking layer (EBL 1 )  430  disposed between the first electrode  210  and the EML 1   440 , and optionally a first hole blocking layer (HBL 1 )  450  disposed between the EML 1   440  and CGL  470 . In addition, the first emitting part  400  may further include an HIL  410  disposed between the first electrode  210  and the EBL 1   430  and a first hole transport layer (HTL 1 )  420  disposed between the HIL  410  and the EBL 1   430 . 
     The second emitting part  500  includes a second emitting material layer (EML 2 )  540  disposed between the CGL  470  and the second electrode  220 . The second emitting part  500  may include a second electron blocking layer (EBL 2 )  530  disposed between the CGL  470  and the EML 2   540 , and optionally a second hole blocking layer (HBL 2 )  550  disposed between the EML 2   540  and the second electrode  220 . In addition, the second emitting part  500  may further include a second hole transport layer (HTL 2 )  520  disposed between the CGL  470  and EBL 2   530  and an EIL  560  disposed between the HBL 2   550  and the second electrode  220 . Each of the HIL  410 , the HTL 1   420 , the HTL 2   520  and the EIL  560  may independently include the same material as described above. The HTL 1   420  may include the same material as or different material from the HTL 2   520 . 
     The EML 1   440  includes a first dopant  442  of a boron-based compound and a first host  444  of an anthracene-based compound so that the EML 1   440  emits blue (B) light. The EML 2   540  includes a second dopant  542  of a boron-based compound and a second host  544  of an anthracene-based compound so that the EML 2   540  emits blue (B) light. 
     Each of the first dopant  442  and the second dopant  542  of the born-based compound may not be deuterated or partially deuterated, and may have independently the structure of Formulae 1A to 2. Each of the first host  444  and the second host  544  of the anthracene-based compound may be at least partially deuterated, and may have independently the structure of Formulae 3 to 4. The first dopant  442  may be identical to or different from the second dopant  542 , and the first host  444  may be identical to or different from the second host  544 . 
     In one exemplary embodiment, each of the contents of the first host  444  and the second host  544  may be independently about 70 wt % to about 99.9 wt % and each of the contents of the first dopant  442  and the second dopant  542  may be independently about 0.1 wt % to about 30 wt % in the EML 1   440  and in the EML 2   540 , respectively. For example, the contents of the first dopant  442  and the second dopant  542  in the EML 1   440  and in the EML 2   540 , respectively, may be about 0.1 wt % to about 10 wt %, for example, about 1 wt % to about 5 wt % so that both the EML 1   440  and the EML 2   540  can implement sufficient luminous efficiency and luminous lifespan. 
     Each of the EBL 1   430  and the EBL 2   530  prevents electrons from transporting from the EML 1   440  or EML 2   540  to the first electrode  210  or the CGL  470 , respectively. Each of the EBL 1   430  and the EBL 2   530  may include a first electron blocking material  432  and a second electron blocking material  532 , respectively. Each of the first electron blocking material  432  and the second electron blocking material  532  may comprise independently the amine-based compound having the structure of Formulae 5 to 6, respectively. The first electron blocking material  432  may be identical to or different from the second electron blocking material  532 . 
     Each of the HBL 1   450  and the HBL 2   550  prevents holes from transporting from the EML 1   440  or EML 2   540  to the CGL  470  or the second electrode  220 , respectively. Each of the HBL 1   450  and the HBL 2   550  may include a first hole blocking material  452  and a second hole blocking material  552 , respectively. Each of the first hole blocking material  452  and the second hole blocking material  552  may comprise independently the azine-based compound having the structure of Formulae 7 to 8 and/or the benzimidazole-based compound having the structure of Formulae 9 to 10, respectively. The first hole blocking material  452  may be identical to or different from the second hole blocking material  552 . 
     As described above, the compound having the structure of Formulae 7 to 10 has excellent electron transport property as well as excellent hole blocking property. Therefore, each of the HBL 1   450  and the HBL 2   550  may function as a hole blocking layer and an electron transport layer. 
     In an alternative embodiment, the first emitting part  400  may further include a first electron transport layer (ETL 1 ) disposed between the HBL 1   450  and the CGL  470  and/or the second emitting part  500  may further include a second electron transport layer (ETL 2 ) disposed between the HBL 2   550  and the EIL  560 . 
     The CGL  470  is disposed between the first emitting part  400  and the second emitting part  500  so that the first emitting part  400  and the second emitting part  500  are connected via the CGL  470 . The CGL  470  may be a PN-junction CGL having an N-type CGL (N-CGL)  480  and a P-type CGL (P-CGL)  490 . The N-CGL  480  is disposed between the HBL 1   450  and the HTL 2   520  and the P-CGL  490  is disposed between the N-CGL  480  and the HTL 2   520 . The N-CGL  480  injects electrons into the first emitting part  400  and the P-CGL  490  injects holes into the second emitting part  500 . 
     As an example, the N-CGL  480  may be an organic layer doped with an alkali metal such as Li, Na, K and/or Cs and/or an alkaline earth metal such as Mg, Sr, Ba and/or Ra. For example, an organic host used in the N-CGL  480  may include, but is not limited to, an organic compound such as Bphen or MTDATA. The alkali metal and/or the alkaline earth metal may be doped by about 0.01 wt % to about 30 wt % in the N-type CGL  480 . 
     The P-CGL  490  may include, but is not limited to, an inorganic material selected from the group consisting of tungsten oxide (WO x ), molybdenum oxide (MoO x ), beryllium oxide (Be 2 O 3 ), vanadium oxide (V 2 O 5 ) and combination thereof, and/or an organic material selected from the group consisting of NPD, HAT-CN, F4TCNQ, TPD, N,N,N′,N′-Tetranaphthalenyl-benzidine (TNB), TCTA, N,N′-dioctyl-3,4,9,10-perylenedicarboximide (PTCDI-C8) and combination thereof. 
     Alternatively, the P-CGL  490  may include a P-type host having the structure of Formula 11 and a P-type dopant having the structure of Formula 12. When the P-CGL  490  includes the P-type host and the P-type dopant, the contents of the P-type dopant in the P-CGL  490  may be, but is not limited to, about 1 wt % to about 50 wt %, for example, about 1 wt % to about 30 wt %. 
     Each of the EML 1   440  and the EML 2   540  includes the first and second dopants  442  and  542  of the boron-based compound and the first and second hosts  444  and  544  of the anthracene-based compound where at least one carbon atoms are deuterated, respectively. Each of the first and second dopants  442  and  542  of the boron-based compound may have independently an asymmetric chemical structure such as Formula 1B and may not be deuterated or partially deuterated. Also, each of the first and second hosts  444  and  544  of the anthracene-based compound may have a structure where two naphthyl moieties are linked directly or via the linker to the anthracene moiety and at least one protium, for example, all protiums are deuterated. Accordingly, the OLED D2 and the organic light emitting display device  100  can improve their luminous efficiency and luminous lifespan. 
     In addition, the OLED D2 and the organic light emitting display device  100  can maximize their luminous efficiency and luminous lifespan by applying the aryl amine-based compound having the structure of Formulae 5 and 6 into the EBL 1   430  and the EBL 2   530  as the first and second electron blocking materials  432  and  532 , respectively, and optionally the azine-based compound having the structure of Formulae 7 to 8 and/or the benzimidazole-based compound having the structure of Formulae 9 to 10 into the HBL 1   450  and the HBL 2   550  as the first and second hole blocking materials  452  and  552 , respectively. In addition, the organic light emitting display device  100  (See,  FIG. 2 ) can implement an image having high color purity by laminating double stack structure of two emitting parts  400  and  500  each of which emits blue color light. 
     In the second embodiment, the OLED D2 has a tandem structure of two emitting parts. Alternatively, an OLED may include three or more emitting parts, for example, may include a second CGL and a third emitting part disposed on the second emitting parts  500  except the EIL  560  (See,  FIG. 7 ). 
     In the above embodiment, the organic light emitting display device  100  and the OLEDs D1 and D2 implement blue (B) emission. Alternatively, an organic light emitting display device and an OLED can implement a full color display device including white (W) emission.  FIG. 5  is a schematic cross-sectional view illustrating an organic light emitting display device in accordance with another exemplary embodiment of the present disclosure. 
     As illustrated in  FIG. 5 , the organic light emitting display device  600  comprises a first substrate  602  that defines each of a red pixel region RP, a green pixel region GP and a blue pixel region BP, a second substrate  604  facing the first substrate  602 , a thin film transistor Tr over the first substrate  602 , an organic light emitting diode D disposed between the first and second substrates  602  and  604  and emitting white (W) light and a color filter layer  680  disposed between the organic light emitting diode D and the second substrate  604 . 
     Each of the first and second substrates  602  and  604  may include, but is not limited to, glass, flexible material and/or polymer plastics. For example, each of the first and second substrates  602  and  604  may be made of PI, PES, PEN, PET, PC and combination thereof. The first substrate  602 , over which a thin film transistor Tr and an organic light emitting diode D are arranged, forms an array substrate. 
     A buffer layer  606  may be disposed over the first substrate  602 , and the thin film transistor Tr is disposed over the buffer layer  606  correspondingly to each of the red pixel region RP, the green pixel region GP and the blue pixel region BP. The buffer layer  606  may be omitted. 
     A semiconductor layer  610  is disposed over the buffer layer  606 . The semiconductor layer  610  may be made of oxide semiconductor material or polycrystalline silicon. 
     A gate insulating layer  620  including an insulating material, for example, inorganic insulating material such as silicon oxide (SiO x ) or silicon nitride (SiN x ) is disposed on the semiconductor layer  610 . 
     A gate electrode  630  made of a conductive material such as a metal is disposed over the gate insulating layer  620  so as to correspond to a center of the semiconductor layer  610 . An interlayer insulting layer  640  including an insulating material, for example, inorganic insulating material such as silicon oxide (SiO x ) or silicon nitride (SiN x ), or an organic insulating material such as benzocyclobutene or photo-acryl, is disposed on the gate electrode  630 . 
     The interlayer insulating layer  640  has first and second semiconductor layer contact holes  642  and  644  that expose both sides of the semiconductor layer  610 . The first and second semiconductor layer contact holes  642  and  644  are disposed over opposite sides of the gate electrode  630  with spacing apart from the gate electrode  630 . 
     A source electrode  652  and a drain electrode  654 , which are made of a conductive material such as a metal, are disposed on the interlayer insulating layer  640 . The source electrode  652  and the drain electrode  654  are spaced apart from each other with respect to the gate electrode  630 , and contact both sides of the semiconductor layer  610  through the first and second semiconductor layer contact holes  642  and  644 , respectively. 
     The semiconductor layer  610 , the gate electrode  630 , the source electrode  652  and the drain electrode  654  constitute the thin film transistor Tr, which acts as a driving element. 
     Although not shown in  FIG. 5 , a gate line and a data line, which cross each other to define a pixel region, and a switching element, which is connected to the gate line and the data line, may be further formed in the pixel region. The switching element is connected to the thin film transistor Tr, which is a driving element. In addition, a power line is spaced apart in parallel from the gate line or the data line, and the thin film transistor Tr may further include a storage capacitor configured to constantly keep a voltage of the gate electrode for one frame. 
     A passivation layer  660  is disposed on the source and drain electrodes  652  and  654  with covering the thin film transistor Tr over the whole first substrate  602 . The passivation layer  660  has a drain contact hole  662  that exposes the drain electrode  654  of the thin film transistor Tr. 
     The organic light emitting diode (OLED) D is located over the passivation layer  660 . The OLED D includes a first electrode  710  that is connected to the drain electrode  654  of the thin film transistor Tr, a second electrode  720  facing from the first electrode  710  and an emissive layer  730  disposed between the first and second electrodes  710  and  720 . 
     The first electrode  710  formed for each pixel region may be an anode and may include a conductive material having relatively high work function value, for example, TCO. As an example, the first electrode  710  may include, ITO, IZO, ITZO, SnO, ZnO, ICO, AZO, and the like. 
     When the organic light emitting display device  600  is a bottom-emission type, the first electrode  710  may have a single-layered structure of TCO. Alternatively, when the organic light emitting display device  600  is a top-emission type, a reflective electrode or a reflective layer may be disposed under the first electrode  710 . For example, the reflective electrode or the reflective layer may include, but is not limited to, Ag or APC alloy. In the organic light emitting display device  600  of the top-emission type, the first electrode  710  may have a triple-layered structure of ITO/Ag/ITO or ITO/APC/ITO. 
     A bank layer  664  is disposed on the passivation layer  660  in order to cover edges of the first electrode  710 . The bank layer  664  exposes a center of the first electrode  710  corresponding to each of the red pixel region RP, the green pixel region GP and the blue pixel region BP. The bank layer  664  may be omitted. 
     An emissive layer  730  including multiple emitting parts is disposed on the first electrode  710 . Since the OLED D emits white light in each of the red, green and blue pixel regions RP, GP and BP, the emissive layer  730  may be formed of a common layer without separating in the red, green and blue pixel regions RP, GP and BP. 
     As illustrated in  FIGS. 6 and 7 , the emissive layer  730  may include multiple emitting parts  800 ,  900 ,  1000 ,  1100  and  1200  and at least one charge generation layer  870 ,  1070  and  1170 . Each of the emitting parts  800 ,  900 ,  1000 ,  1100  and  1200  may include EML and may further include at least one of HIL, HTL, EBL, HBL, ETL and/or EIL. 
     The second electrode  720  is disposed over the first substrate  602  above which the emissive layer  730  is disposed. The second electrode  720  may be disposed over a whole display area, and may include a conductive material with a relatively low work function value compared to the first electrode  710 , and may be a cathode. For example, the second electrode  720  may include, but is not limited to, Al, Mg, Ca, Ag, alloy thereof and combination thereof such as Al—Mg. 
     Since the light emitted from the emissive layer  730  is incident to the color filter layer  680  through the second electrode  720  in the organic light emitting display device  600  in accordance with the second embodiment of the present disclosure, the second electrode  720  has a thin thickness so that the light can be transmitted. 
     The color filter layer  680  is disposed over the OLED D and includes a red color filter  682 , a green color filter  684  and a blue color filter  686  each of which is disposed correspondingly to the red pixel region RP, the green pixel region GP and the blue pixel region BP, respectively. Although not shown in  FIG. 5 , the color filter layer  680  may be attached to the OLED through an adhesive layer. Alternatively, the color filter layer  680  may be disposed directly on the OLED D. 
     In addition, an encapsulation film may be disposed over the second electrode  720  in order to prevent outer moisture from penetrating into the OLED D. The encapsulation film may have, but is not limited to, a laminated structure of a first inorganic insulating film, an organic insulating film and a second inorganic insulating film (See,  170  in  FIG. 2 ). In addition, the organic light emitting display device  600  may further include a polarizing plate.to reduce reflection of external light. For example, the polarizing plate may be a circular polarizing plate. When the organic light emitting display device  600  is a bottom-emission type, the polarizing plate may be located under the first substrate  602 . Alternatively, when the organic light emitting display device  600  is a top emission type, the polarizing plate may be located over the second substrate  604 . 
     In  FIG. 5 , the light emitted from the OLED D is transmitted through the second electrode  720  and the color filter layer  680  is disposed over the OLED D. Alternatively, the light emitted from the OLED D is transmitted through the first electrode  710  and the color filter layer  680  may be disposed between the OLED D and the first substrate  602 . In addition, a color conversion layer may be formed between the OLED D and the color filter layer  680 . The color conversion layer may include a red color conversion layer, a green color conversion layer and a blue color conversion layer each of which is disposed correspondingly to each pixel region (RP, GP and BP), respectively, so as to covert the white (W) color light to each of a red, green and blue color lights, respectively. 
     As described above, the white (W) color light emitted from the OLED D is transmitted through the red color filter  682 , the green color filter  684  and the blue color filter  686  each of which is disposed correspondingly to the red pixel region RP, the green pixel region GP and the blue pixel region BP, respectively, so that red, green and blue color lights are displayed in the red pixel region RP, the green pixel region GP and the blue pixel region BP. 
       FIG. 6  is a schematic cross-sectional view illustrating an organic light emitting diode having a tandem structure of two emitting parts. As illustrated in  FIG. 6 , the organic light emitting diode (OLED) D3 in accordance with the exemplary embodiment includes first and second electrodes  710  and  720  and an emissive layer  730  disposed between the first and second electrodes  710  and  720 . The emissive layer  730  includes a first emitting part  800  disposed between the first and second electrodes  710  and  720 , a second emitting part  900  disposed between the first emitting part  800  and the second electrode  720  and a charge generation layer (CGL)  870  disposed between the first and second emitting parts  800  and  900 . 
     One of the first and second electrodes  710  and  720  may be an anode and the other of the first and second electrodes  710  and  720  may be a cathode. Also, one of the first and second electrodes  710  and  720  may be a transmissive (semi-transmissive) electrode and the other of the first and second electrodes  710  and  720  may be a reflective electrode. 
     In addition, one of the first and second emitting parts  800  and  900  emit blue (B) light and the other of the first and second emitting parts  800  and  900  emits red-green (RG) or yellow-green (YG) light. Hereinafter, the OLED D3 where the first emitting part  800  emits blue (B) light and the second emitting part  900  emits red-green (RG) and/or yellow-green (YG) light will be described in detail. 
     The first emitting part  800  includes an EML 1   840  disposed between the first electrode  710  and the CGL  870 . The first emitting part  800  may include an EBL 1   830  disposed between the first electrode  710  and the EML 1   840 , and optionally an HBL 1   850  disposed between the EML 1   840  and the CGL  870 . In addition, the first emitting part  800  may further include an HIL  810  disposed between the first electrode and the EBL 1   830  and an HTL 1   820  disposed between the HIL  810  and the EBL 1   830 . Alternatively, the first emitting part  800  may further include an ETL 1  disposed between the HBL 1   850  and the CGL  870 . 
     The second emitting part  900  includes an EML 2   940  disposed between the CGL  870  and the second electrode  720 . The second emitting part  900  may include an HTL  920  disposed between the CGL  870  and the EML 2   940  and an ETL 2   950  disposed between the second electrode  720  and the EML 2   940  and an EIL  960  disposed between the second electrode  720  and the ETL 2   950 . Alternatively, the second emitting part  900  may further include an EBL 2  disposed between the HTL 2   920  and the EML 2   940  and/or an HBL 2  disposed between the EML 2   940  and the ETL 2   950 . 
     The CGL  870  is disposed between the first emitting part  800  and the second emitting part  900 . The CGL  870  may be a PN-junction CGL having an N-CGL  870  and a P-CGL  890 . The N-CGL  880  is disposed between the HBL 1   850  and the HTL 2   920  and the P-CGL  890  is disposed between the N-CGL  880  and the HTL 2   920 . 
     Each of the HIL  810 , the HTL 1   820 , the HTL 2   920 , the EIL  560  and the CGL  870  may independently include the same material as described above. The HTL 1   820  may include the same material as or different material from the HTL 2   920 . 
     The EML 1   840  includes a first dopant  842  of a boron-based compound and a first host  844  of an anthracene-based compound so that the EML 1   840  emits blue (B) light. The first dopant  842  of the born-based compound may not be deuterated or partially deuterated, and may have the structure of Formulae 1A to 2. The first host  844  of the anthracene-based compound may be at least partially deuterated, and may have the structure of Formulae 3 to 4. 
     In one exemplary embodiment, the contents of the first host  844  may be about 70 wt % to about 99.9 wt % and the contents of the first dopant  842  may be about 0.1 wt % to about 30 wt % in the EML 1   840 . For example, the contents of the first dopant  844  in the EML 1   840  may be about 0.1 wt % to about 10 wt %, for example, about 1 wt % to about 5 wt % so that the EML 1   840  can implement sufficient luminous efficiency and luminous lifespan. 
     The EBL 1   830  prevents electrons from transporting from the EML 1   840  to the first electrode  710  and may include an electron blocking material  832 . The electron blocking material  832  may include the amine-based compound having the structure of Formulae 5 to 6. 
     The HBL 1   850  prevent holes from transporting form the EML 1   840  to the CGL  870  and may include a hole blocking material  852 . The hole blocking material  852  may include the azine-based compound having the structure of Formulae 7 to 8 and/or the benzimidazole-based compound having the structure of Formulae 9 to 10. As described above, the compound having the structure of Formulae 7 to 10 has excellent electron transport property as well as excellent hole blocking property. Therefore, the HBL 1   850  may function as a hole blocking layer and an electron transport layer. 
     In one exemplary aspect, the EML 2   940  may emit yellow-green (YG) light. For example, the EML 2   940  may include yellow-green (YG) dopant  943  and a host  945 . 
     The host  945  in the EML 2   940  may include, but is not limited to, 9,9′-Diphenyl-9H,9′H-3,3′-bicarbazole (BCzPh), CBP, 1,3,5-Tris(carbazole-9-yl)benzene (TCP), TCTA, 4,4′-Bis(carbazole-9-yl)-2,2′-dimethylbipheyl (CDBP), 2,7-Bis(carbazole-9-yl)-9,9-dimethylfluorene (DMFL-CBP), 2,2′,7,7′-Tetrakis(carbazole-9-yl)-9,9-spirofluorene (Spiro-CBP), Bis[2-(diphenylphosphine)phenyl] ether oxide (DPEPO), 4′-(9H-carbazol-9-yl)biphenyl-3,5-dicarbonitrile (PCzB-2CN), 3′-(9H-carbazol-9-yl)biphenyl-3,5-dicarbonitrile (mCzB-2CN), 3,6-Bis(carbazole-9-yl)-9-(2-ethyl-hexyl)-9H-carbazole (TCz1), Bis(2-hydroxylphenyl)-pyridine)beryllium (Bepp2), Bis(10-hydroxylbenzo[h] quinolinato)beryllium (Bebg2) and/or 1,3,5-Tris(1-pyrenyl)benzene (TPB3). 
     The yellow-green (YG) dopant  943  may include at least one of yellow-green (YG) fluorescent material, yellow-green (YG) phosphorescent material and yellow-green (YG) delayed fluorescent material. As an example, the yellow-green (YG) dopant  943  may include, but is not limited to, 5,6,11,12-Tetraphenylnaphthalene (Rubrene), 2,8-Di-tert-butyl-5,11-bis(4-tert-butylphenyl)-6,12-diphenyltetracene (TBRb), Bis(2-phenylbenzothiazolato)(acetylacetonate)iridium(III) (Ir(BT) 2 (acac)), Bis(2-(9,9-diethytl-fluoren-2-yl)-1-phenyl-1H-benzo[d]imdiazolato)(acetylacetonate)iridium(III) (Ir(fbi) 2 (acac)), Bis(2-phenylpyridine)(3-(pyridine-2-yl)-2H-chromen-2-onate)iridium(III) (fac-Ir(ppy) 2 Pc), Bis(2-(2,4-difluorophenyl)quinoline)(picolinate)iridium(III) (FPQIrpic), and the like. 
     Alternatively, the EML 2   940  may emit red-green (RG) light. In this case, the EML 2   940  may include green (G) and red (R) dopant  943  and a host  945 . In this case, the EML 2   940  may have a single-layered structure including the host, green (G) dopant and red (R) dopant, or may have a double-layered structure comprising a lower layer (first layer) including a host and green (G) dopant (or red (R) dopant) and an upper layer (second layer) including a host and red (R) dopant (or green (G) dopant). 
     The host  945  in the EML 2   940  emitting red-green (RG) light may be the same as the host emitting yellow-green (YG) light. 
     The green (G) dopant  943  in the EML 2   940  may include at least one of green fluorescent material, green phosphorescent material and green delayed fluorescent material. As an example, the green (G) dopant  943  may include, but is not limited to, [Bis(2-phenylpyridine)](pyridyl-2-benzofuro[2,3-b]pyridine)iridium, fac-Tris(2-phenylpyridine)iridium(III) (fac-Ir(ppy) 3 ), Bis(2-phenylpyridine)(acetylacetonate)iridium(III) (Ir(ppy) 2 (acac)), Tris[2-(p-tolyl)pyridine]iridium(III) (Ir(mppy) 3 ), Bis(2-(naphthalene-2-yl)pyridine)(acetylacetonate)iridium(III) (Ir(npy) 2 acac), Tris(2-phenyl-3-methyl-pyridine)iridium (Ir(3mppy) 3 ), fac-Tris(2-(3-p-xylyl)phenyl)pyridine iridium(III) (TEG), and the like 
     The red (R) dopant  943  in the EML 2   940  may include at least one of red fluorescent material, red phosphorescent material and red delayed fluorescent material. As an example, the red (R) dopant  943  may include, but is not limited to, [Bis(2-(4,6-dimethyl)phenylquinoline)](2,2,6,6-tetramethylheptane-3,5-dionate)iridium(III), Bis[2-(4-n-hexylphenyl)quinoline](acetylacetonate)iridium(III) (Hex-Ir(phq) 2 (acac)), Tris[2-(4-n-hexylphenyl)quinoline]iridium(III) (Hex-Ir(phq) 3 ), Tris[2-phenyl-4-methylquinoline]iridium(III) (Ir(Mphq) 3 ), Bis(2-phenylquinoline)(2,2,6,6-tetramethylheptene-3,5-dionate)iridium(III) (Ir(dpm)PQ 2 ), Bis(phenylisoquinoline)(2,2,6,6-tetramethylheptene-3,5-dionate)iridium(III) (Ir(dpm)(piq) 2 ), Bis[(4-n-hexylphenyl)isoquinoline](acetylacetonate)iridium(III) (Hex-Ir(piq) 2 (acac)), Tris[2-(4-n-hexylphenyl)quinoline]iridium(III) (Hex-Ir(piq) 3 ), Tris(2-(3-methylphenyl)-7-methyl-quinolato)iridium (Ir(dmpq) 3 ), Bis[2-(2-methylphenyl)-7-methyl-quinoline](acetylacetonate)iridium(III) (Ir(dmpq) 2 (acac)), Bis[2-(3,5-dimethylphenyl)-4-methyl-quinoline](acetylacetonate)iridium(III) (Ir(mphmq) 2 (acac)), and the like. 
     In an alternative aspect, the EML 2   940  may have a triple-layered structure of a first layer including a host and red (R) dopant, a second layer including a host and yellow-green (YG) dopant and a third layer including a host and green (G) dopant. 
     When the EML 2   940  emits red-green (RG) or yellow-green (YG) light, the contents of the host  945  may be about 70 wt % to about 99.9 wt % and the contents of the dopant  943  may be about 0.01 wt % to about 30 wt %, respectively, in the EML 2   940 . For example, the contents of the dopant  943  in the EML 2   940  may be about 0.1 wt % to about 10 wt %, for example, about 1 wt % to about 5 wt % so that the EML 2   940  can implement sufficient luminous efficiency and luminous lifespan. 
     Each of the ETL 1  and the ETL 2   950  may include independently oxadiazole-based compounds, triazole-based compounds, phenanthroline-based compounds, benzoxazole-based compounds, benzothiazole-based compounds, benzimidazole-based compounds, triazine-based compounds, and the like. For example, each of the ETL 1  and the ETL 2   950  may include independently electron transport material selected from, but is not limited to, Alq 3 , PBD, spiro-PBD, Liq, TPBi, BAlq, Bphen, NBphen, BCP, TAZ, NTAZ, TpPyPB, TmPPPyTz, PFNBr, TPQ, TSPO1, ZADN, 1,3-bis(9-phenyl-1,10-phenathrolin-2-yl)benzene, p-bPPhenB, m-bPPhenB and combination thereof. 
     The EBL 2 , which may be disposed between the HTL 2   920  and the EML 2   940 , may include a second electron blocking material. As an example, the second electron blocking material may include the amine-based compound having the structure of Formulae 5 to 6. 
     Alternatively, the EBL 2  may include, but is not limited to, TCTA, Tris[4-(diethylamino)phenyl]amine, N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluorene-2-amine, TAPC, MTDATA, 1,3-bis(carbazol-9-yl)benzene (mCP), 3,3-di(9H-carbazol-9-yl)biphenyl (mCBP), CuPc, DNTPD, TDAPB, DCDPA, 2,8-bis(9-phneyl-9H-carbazol-3-yl)dibenzo[b,d]thiophene, 3,6-bis(N-carbazolyl)-N-phenyl-carbazole and combination thereof. 
     The HBL 2 , which may be disposed between the EML 2   940  and the ETL 2   960 , may include a second hole blocking material. As an example, the second hole blocking material may include the azine-based compound having the structure of Formulae 7 to 8 and/or the benzimidazole-based compound having the structure of Formulae 9 to 10. Alternatively, the HBL 2  may include oxadiazole-based compounds, triazole-based compounds, phenanthroline-based compounds, benzoxazole-based compounds, benzothiazole-based compounds, benzimidazole-based compounds, triazine-based compounds, and the like, which can be used as the electron transport material in the ETL 2   950 . 
     In the OLED D3, the EML 1   840  includes the dopant  842  of the boron-based compound and the host  844  of the anthracene-based compound in which at least one protium is substituted with deuterium, and the EML 2   940  emits red-green (RG) and/or yellow-green (YG) light. Alternatively, the EML 1   840  may emit red-green (RG) and/or yellow green light and the EML 2   940  may include the dopant  842  of the boron-based compound and the host  844  of the anthracene-based compound to emit blue (B) light. 
     In the OLED D3, the EML 1   840  includes the dopant  842  of the boron-based compound and the host  844  of the anthracene-based compound which is at least partially deuterated. The dopant  842  of the boron-based compound may have an asymmetric chemical structure such as Formula 1B and may not be deuterated or partially deuterated. Also, the host  844  of the anthracene-based compound may have a structure where two naphthyl moieties are linked directly or via the linker to the anthracene moiety and at least one protium, for example, all protiums are deuterated. Accordingly, the OLED D3 and the organic light emitting display device  600  can improve their luminous efficiency and luminous lifespan. 
     In addition, the OLED D3 and the organic light emitting display device  600  can maximize their luminous efficiency and luminous lifespan by applying the aryl amine-based compound having the structure of Formulae 5 and 6 into the EBL 1   830  as the first electron blocking materials  832 , and optionally the azine-based compound having the structure of Formulae 7 to 8 and/or the benzimidazole-based compound having the structure of Formulae 9 to 10 into the HBL 1   850  as the first hole blocking layers  852 . 
     Alternatively, an organic light emitting diode may have three or more emitting parts.  FIG. 7  is a schematic cross-sectional view illustrating an organic light emitting diode in accordance with still another exemplary aspect of the present disclosure. As illustrated in  FIG. 7 , the organic light emitting diode (OLED) D4 includes first and second electrodes  710  and  720  facing each other and an emissive layer  730 A disposed between the first and second electrodes  710  and  720 . The emissive layer  730 A includes a first emitting part  1000  disposed between the first and second electrodes  710  and  720 , a second emitting part  1100  disposed between the first emitting part  1000  and the second electrode  720 , a third emitting part  1200  disposed between the second emitting part  1100  and the second electrode  720 , a first charge generation layer (CGL 1 )  1070  disposed between the first and second emitting parts  1000  and  1100 , and a second charge generation layer (CGL 2 )  1170  disposed between the second and third emitting parts  1100  and  1200 . 
     At least one of the first to third emitting parts  1000 ,  1100  and  1200  may emit blue (B) light and at least another of the first to third emitting parts  1000 ,  1100  and  1200  may emit red green (RG) or yellow green (YG) light. Hereinafter, the OLED D4, where the first and third emitting parts  1000  and  1200  emit blue (B) light and the second emitting part  1100  emits red green (RG) and/or yellow green (YG) light, will be explained in detail. 
     The first emitting part  1000  includes an EML 1   1040  disposed between the first electrode  710  and the CGL 1   1070 . The first emitting part  1000  may include an EBL 1   1030  disposed between the first electrode  710  and the EML 1   1040 , and optionally an HBL 1   1050  disposed between the EML 1   1040  and the CGL 1   1070 . In addition, the first emitting part  1000  may further include an HIL  1010  disposed between the first electrode  710  and the EBL 1   1030 , an HTL 1   1020  disposed between the HIL  1010  and the EBL 1   1030 , and optionally a first electron transport layer (ETL 1 ) disposed between the HBL 1   1050  and the CGL 1   1070 . 
     The second emitting part  1100  includes an EML 2   1140  disposed between the CGL 1   1070  and the CGL 2   1170 . The second emitting part  1100  may include an HTL 2   1120  disposed between the CGL 1   1070  and the EML 2   1140  and an ETL 2   1150  disposed between the EML 2   1140  and the CGL 2   1170 . In addition, the second emitting part  1100  may further include an EBL 2  disposed between the HTL 2   1120  and the EML 2   1140  and/or an HBL 2  disposed between the EML 2   1140  and the ETL 2   1150 . 
     The third emitting part  1200  includes a third emitting material layer (EML 3 )  1240  disposed between the CGL 2   1170  and the second electrode  720 . The third emitting part  1200  may include a third electron blocking layer (EBL 3 )  1230  disposed between the CGL 2   1170  and the EML 3   1240 , and optionally a third hole blocking layer (HBL 3 )  1250  disposed between the EML 3   1240  and the second electrode  720 . In addition, the third emitting part  1200  may further include a third hole transport layer (HTL 3 )  1220  disposed between the CGL 2   1170  and the EBL 3   1230 , an EIL  1260  disposed between the HBL 3   1250  and the second electrode  720 , and optionally a third electron transport layer (ETL 3 ) disposed between the HBL 3   1250  and the EIL  1260 . 
     The CGL 1   1070  is disposed between the first emitting part  1000  and the second emitting part  1100 . The CGL 1   1070  may be a PN-junction CGL having a first N-type CGL (N-CGL 1 )  1080  and a first P-type CGL (P-CGL 1 )  1090 . The N-CGL 1   1080  is disposed between the HBL 1   1050  and the HTL 2   1120  and the P-CGL 1   1090  is disposed between the N-CGL 1   1080  and the HTL 2   1120 . The N-CGL 1   1080  injects electrons into the first emitting part  1000  and the P-CGL 1   1090  injects holes into the second emitting part  1100 . 
     The CGL 2   1170  is disposed between the second emitting part  1100  and the third emitting part  1200 . The CGL 2   1170  may be a PN-junction CGL having a second N-type CGL (N-CGL 2 )  1180  and a second P-type CGL (P-CGL 2 )  1190 . The N-CGL 2   1080  is disposed between the ETL 2   1150  and the HTL 3   1220  and the P-CGL 2   1190  is disposed between the N-CGL 2   1180  and the HTL 3   1220 . The N-CGL 2   1180  injects electrons into the second emitting part  1100  and the P-CGL 2   1190  injects holes into the third emitting part  1200 . 
     Each of the HIL  1010 , the HTL 1   1020 , the HTL 2   1120 , the HTL 3   1130 , the EIL  120 , the CGL 1   1070  and the CGL 2   1170  may independently include the same material as described above. Each of the HTL 1   1020 , the HTL 2   1120  and the HTL 3   1220  may comprise the same material or different material to each other. In addition, the CGL 1   1070  may comprise the same material as or different material from the CGL 2   1170 . 
     The EML 1   1040  includes a first dopant  1042  of a boron-based compound and a first host  1044  of an anthracene-based compound so that the EML 1   1040  emits blue (B) light. The EML 3   1240  includes a second dopant  1242  of a boron-based compound and a second host  1244  of an anthracene-based compound so that the EML 3   1240  emits blue (B) light. 
     Each of the first dopant  1042  and the second dopant  1242  of the born-based compound may not be deuterated or partially deuterated, and may have independently the structure of Formulae 1A to 2. Each of the first host  1044  and the second host  1244  of the anthracene-based compound may be at least partially deuterated, and may have independently the structure of Formulae 3 to 4. The first dopant  1042  may be identical to or different from the second dopant  1242 , and the first host  1044  may be identical to or different from the second host  1244 . 
     In one exemplary embodiment, each of the contents of the first host  1044  and the second host  1244  may be independently about 70 wt % to about 99.9 wt % and each of the contents of the first dopant  1042  and the second dopant  1242  may be independently about 0.1 wt % to about 30 wt % in the EML 1   1040  and in the EML 3   1240 , respectively. For example, the contents of the first dopant  1042  and the second dopant  1242  in the EML 1   1040  and in the EML 3   1240 , respectively, may be about 0.1 wt % to about 10 wt %, for example, about 1 wt % to about 5 wt % so that both the EML 1   1040  and the EML 3   1240  can implement sufficient luminous efficiency and luminous lifespan. 
     Each of the EBL 1   1030  and the EBL 3   1230  prevents electrons from transporting from the EML 1   1040  or EML 3   1240  to the first electrode  710  or the CGL 2   1170 , respectively. Each of the EBL 1   1030  and the EBL 3   1230  may include a first electron blocking material  1032  and a third electron blocking material  1232 , respectively. Each of the first electron blocking material  1032  and the third electron blocking material  1232  may comprise independently the amine-based compound having the structure of Formulae 5 to 6, respectively. The first electron blocking material  1032  may be identical to or different from the third electron blocking material  1232 . 
     Each of the HBL 1   1050  and the HBL 3   1250  prevents holes from transporting from the EML 1   1040  or EML 3   1240  to the CGL 1   1070  or the second electrode  720 , respectively. Each of the HBL 1   1050  and the HBL 3   1250  may include a first hole blocking material  1052  and a third hole blocking material  1252 , respectively. Each of the first hole blocking material  1052  and the third hole blocking material  1252  may comprise independently the azine-based compound having the structure of Formulae 7 to 8 and/or the benzimidazole-based compound having the structure of Formulae 9 to 10, respectively. The first hole blocking material  1052  may be identical to or different from the third hole blocking material  1252 . 
     As described above, the compound having the structure of Formulae 7 to 10 has excellent electron transport property as well as excellent hole blocking property. Therefore, each of the HBL 1   1050  and the HBL 3   1250  may function as a hole blocking layer and an electron transport layer. 
     In one exemplary aspect, the EML 2   1140  may emit yellow-green (YG) light. For example, the EML 2   1140  may include yellow-green (YG) dopant  1143  and a host  1145 . 
     Alternatively, the EML 2   1140  may emit red-green (RG) light and may include red (R) dopant and green (G) dopant  1143  and a host  1145 . In this case, the EML 2   1140  may have a single-layered structure including the host, green (G) dopant and red (R) dopant, or may have a double-layered structure comprising a lower layer (first layer) including a host and green (G) dopant (or red (R) dopant) and an upper layer (second layer) including a host and red (R) dopant (or green (G) dopant). 
     In an alternative aspect, the EML 2   1140  may have a triple-layered structure of a first layer including a host and red (R) dopant, a second layer including a host and yellow-green (YG) dopant and a third layer including a host and green (G) dopant. The dopant  1143  and the host  1145  in the EML 2   1140  may be identical to the corresponding materials as described above referring to  FIG. 6 . 
     Each of the ETL 1 , the ETL 2   1150 , the ETL 3 , the EBL 2  disposed between the HTL 2   1120  and the EML 2   1140  and the HBL 2  disposed between the EML 2   1140  and the ETL 2   1150  may comprise the identical compounds to the corresponding material as described above. 
     Each of the EML 1   1040  and the EML 3   1240  includes the first and second dopants  1042  and  1242  of the boron-based compound and the first and second hosts  1044  and  1244  of the anthracene-based compound where at least one carbon atoms are deuterated, respectively. Each of the first and second dopants  1042  and  1242  of the boron-based compound may have independently an asymmetric chemical structure such as Formula 1B and may not be deuterated or partially deuterated. Also, each of the first and second hosts  1044  and  1244  of the anthracene-based compound may have a structure where two naphthyl moieties are linked directly or via the linker to the anthracene moiety and at least one protium, for example, all protiums are deuterated. Accordingly, the OLED D4 and the organic light emitting display device  600  can improve their luminous efficiency and luminous lifespan. 
     In addition, the OLED D4 and the organic light emitting display device  600  can maximize their luminous efficiency and luminous lifespan by applying the aryl amine-based compound having the structure of Formulae 5 and 6 into the EBL 1   1030  and the EBL 3   1230  as the first and third electron blocking materials  1032  and  1232 , respectively, and optionally the azine-based compound having the structure of Formulae 7 to 8 and/or the benzimidazole-based compound having the structure of Formulae 9 to 10 into the HBL 1   1050  and the HBL 3   1250  as the first and third hole blocking materials  1052  and  1252 , respectively. In addition, the OLED D4 includes the first and third emitting parts  1000  and  1020  each of which emits blue (B) light and the second emitting part  1100  emitting yellow-green (YG) or red-green (RG) light so that the OLED D4 can emit white (W) light 
     In  FIG. 7 , a tandem-structured OLED D4 having three emitting parts are illustrated. Alternatively, an OLED may further include at least one additional emitting parts and at least one additional charge generation layer. 
     In addition, an organic light emitting device in accordance with the present disclosure may include a color conversion layer.  FIG. 8  is a schematic cross-sectional view illustrating an organic light emitting display device in still another exemplary embodiment of the present disclosure. 
     As illustrated in  FIG. 8 , the organic light emitting display device  1300  comprises a first substrate  1302  that defines each of a red pixel region RP, a green pixel region GP and a blue pixel region BP, a second substrate  1304  facing the first substrate  1302 , a thin film transistor Tr over the first substrate  1302 , an organic light emitting diode (OLED) D disposed between the first and second substrates  1302  and  1304  and emitting blue (B) light and a color conversion layer  1380  disposed between the OLED D and the second substrate  1304 . Although not shown in  FIG. 8 , a color filter layer may be disposed between the second substrate  1304  and the respective color conversion layer  1380 . 
     The thin film transistor Tr is disposed over the first substrate  1302  correspondingly to each of the red pixel region RP, the green pixel region GP and the blue pixel region BP. A passivation layer  1360 , which has a drain contact hole  1362  exposing one electrode, for example a drain electrode, constituting the thin film transistor Tr, is formed with covering the thin film transistor Tr over the whole first substrate  1302 . 
     The OLED D, which includes a first electrode  1410 , an emissive layer  1430  and the second electrode  1420 , is disposed over the passivation layer  1360 . The first electrode  1410  may be connected to the drain electrode of the thin film transistor Tr through the drain contact hole  1362 . In addition, a bank layer  1364  covering edges of the first electrode  1410  is formed at the boundary between the red pixel region RP, the green pixel region GP and the blue pixel region BP. In this case, the OLED D may have a structure of  FIG. 3  or  FIG. 4  and can emit blue (B) light. The OLED D is disposed in each of the red pixel region RP, the green pixel region GP and the blue pixel region BP to provide blue (B) light. 
     The color conversion layer  1380  may include a first color conversion layer  1382  corresponding to the red pixel region RP and a second color conversion layer  1384  corresponding to the green pixel region GP. As an example, the color conversion layer  1380  may include an inorganic luminescent material such as quantum dot (QD). 
     The blue (B) light emitted from the OLED D in the red pixel region RP is converted into red (R) color light by the first color conversion layer  1382  and the blue (B) light emitted from the OLED D in the green pixel region GP is converted into green (G) color light by the second color conversion layer  1384 . Accordingly, the organic light emitting display device  1300  can implement a color image. 
     In addition, when the light emitted from the OLED D is displayed through the first substrate  1302 , the color conversion layer  1380  may be disposed between the OLED D and the first substrate  1302 . 
     Synthesis Example 1: Synthesis of Compound 1-1 
     (1) Synthesis of Intermediate 1-1C 
     
       
         
         
             
             
         
       
     
     Compound 1-1A (69.2 g, 98 mmol), Compound 1-1B (27.6 g, 98 mmol), palladium acetate (0.45 g, 2 mmol), sodium tert-butoxide (18.9 g, 196 mmol), tri-tert-butylphosphine (0.8 g, 4 mmol) and toluene (300 ml) were put into a 500 ml reaction vessel, and then the solution was refluxed for 5 hours with stirring. After the reaction was complete, the solution was filtered, and then the filtrate was concentrated. A crude product was purified with column chromatography to give the Intermediate 1-1C (58.1 g, yield: 84%).
         (2) Synthesis of Compound 1-1       

     
       
         
         
             
             
         
       
     
     The Intermediate 1-1C (11.9 g, 12.5 mmol) and tert-butyl benzene (60 ml) were put into a 500 ml reaction vessel. N-butyl lithium (45 ml, 37.5 mmol) was added dropwisely into the reaction vessel at −78° C., and then the solution was stirred at 60° C. for 3 hours. Nitrogen gas was blown into the reaction vessel at 60° C. to remove a byproduct, boron tribromide (6.3 g, 25 mmol) was added dropwisely to the solution at −78° C., and then the solution was stirred at room temperature (RT) for 1 hour. N,N-diisopropyl ethyl amine (3.2 g, 25 mmol) was added dropwisely to the solution at 0° C., and then the solution was stirred at 120° C. for 2 hours. After the reaction was complete, sodium acetate aqueous solution was added into the reaction vessel at RT, and then the solution was stirred. An organic layer was extracted with ethyl acetate and was concentrated, and then a crude product was purified with column chromatography to give Compound 1-1 (2.3 g, yield: 20%). 
     Synthesis Example 2: Synthesis of Compound 1-4 
     (1) Synthesis of Intermediate 1-4C 
     
       
         
         
             
             
         
       
     
     Compound 1-4A (43.1 g, 98 mmol), Compound 1-4B (27.6 g, 98 mmol), palladium acetate (0.45 g, 2 mmol), sodium tert-butoxide (18.9 g, 196 mmol), tri-tert-butylphosphine (0.8 g, 4 mmol) and toluene (300 ml) were put into a 500 ml reaction vessel, and then the solution was refluxed for 5 hours with stirring. After the reaction was complete, the solution was filtered, and then the filtrate was concentrated. A crude product was purified with column chromatography to give the Intermediate 1-4C (57.1 g, yield: 85%). 
     (2) Synthesis of Compound 1-4 
     
       
         
         
             
             
         
       
     
     The Intermediate 1-4C (8.6 g, 12.5 mmol) and tert-butyl benzene (60 ml) were put into a 500 ml reaction vessel. N-butyl lithium (45 ml, 37.5 mmol) was added dropwisely into the reaction vessel at −78° C., and then the solution was stirred at 60° C. for 3 hours. Nitrogen gas was blown into the reaction vessel at 60° C. to remove a byproduct, boron tribromide (6.3 g, 25 mmol) was added dropwisely to the solution at −78° C., and then the solution was stirred at RT for 1 hour. N,N-diisopropyl ethyl amine (3.2 g, 25 mmol) was added dropwisely to the solution at 0° C., and then the solution was stirred at 120° C. for 2 hours. After the reaction was complete, sodium acetate aqueous solution was added into the reaction vessel at RT, and then the solution was stirred. An organic layer was extracted with ethyl acetate and was concentrated, and then a crude product was purified with column chromatography to give Compound 1-4 (1.9 g, yield: 23%). 
     Synthesis Example 3: Synthesis of Compound 1-6 
     (1) Synthesis of Intermediate 1-6C 
     
       
         
         
             
             
         
       
     
     Compound 1-6A (58.9 g, 98 mmol), Compound 1-6B (33.2 g, 98 mmol), palladium acetate (0.45 g, 2 mmol), sodium tert-butoxide (18.9 g, 196 mmol), tri-tert-butylphosphine (0.8 g, 4 mmol) and toluene (300 ml) were put into a 500 ml reaction vessel, and then the solution was refluxed for 5 hours with stirring. After the reaction was complete, the solution was filtered, and then the filtrate was concentrated. A crude product was purified with column chromatography to give the Intermediate 1-6C (59.7 g, yield: 75%). 
     (2) Synthesis of Compound 1-6 
     
       
         
         
             
             
         
       
     
     The Intermediate 1-6C (10.1 g, 12.5 mmol) and tert-butyl benzene (60 ml) were put into a 500 ml reaction vessel. N-butyl lithium (45 ml, 37.5 mmol) was added dropwisely into the reaction vessel at −78° C., and then the solution was stirred at 60° C. for 3 hours. Nitrogen gas was blown into the reaction vessel at 60° C. to remove a byproduct, boron tribromide (6.3 g, 25 mmol) was added dropwisely to the solution at −78° C., and then the solution was stirred at RT for 1 hour. N,N-diisopropyl ethyl amine (3.2 g, 25 mmol) was added dropwisely to the solution at 0° C., and then the solution was stirred at 120° C. for 2 hours. After the reaction was complete, sodium acetate aqueous solution was added into the reaction vessel at RT, and then the solution was stirred. An organic layer was extracted with ethyl acetate and was concentrated, and then a crude product was purified with column chromatography to give Compound 1-6 (1.9 g, yield: 21%). 
     Synthesis Example 4: Synthesis of Compound 1-8 
     (1) Synthesis of Intermediate 1-8C 
     
       
         
         
             
             
         
       
     
     Compound 1-8A (33.0 g, 98 mmol), Compound 1-8B (45.7 g, 98 mmol), palladium acetate (0.45 g, 2 mmol), sodium tert-butoxide (18.9 g, 196 mmol), tri-tert-butylphosphine (0.8 g, 4 mmol) and toluene (300 ml) were put into a 500 ml reaction vessel, and then the solution was refluxed for 5 hours with stirring. After the reaction was complete, the solution was filtered, and then the filtrate was concentrated. A crude product was purified with column chromatography to give the Intermediate 1-8C (54.1 g, yield: 72%). 
     (2) Synthesis of Compound 1-8 
     
       
         
         
             
             
         
       
     
     The Intermediate 1-8C (9.6 g, 12.5 mmol) and tert-butyl benzene (60 ml) were put into a 500 ml reaction vessel. N-butyl lithium (45 ml, 37.5 mmol) was added dropwisely into the reaction vessel at −78° C., and then the solution was stirred at 60° C. for 3 hours. Nitrogen gas was blown into the reaction vessel at 60° C. to remove a byproduct, boron tribromide (6.3 g, 25 mmol) was added dropwisely to the solution at −78° C., and then the solution was stirred at RT for 1 hour. N,N-diisopropyl ethyl amine (3.2 g, 25 mmol) was added dropwisely to the solution at 0° C., and then the solution was stirred at 120° C. for 2 hours. After the reaction was complete, sodium acetate aqueous solution was added into the reaction vessel at RT, and then the solution was stirred. An organic layer was extracted with ethyl acetate and was concentrated, and then a crude product was purified with column chromatography to give Compound 1-8 (2.0 g, yield: 21%). 
     Synthesis Example 5: Synthesis of Compound 1-11 
     (1) Synthesis of Intermediate 1-11C 
     
       
         
         
             
             
         
       
     
     Compound 1-11A (28.4 g, 98 mmol), Compound 1-11B (52.0 g, 98 mmol), palladium acetate (0.45 g, 2 mmol), sodium tert-butoxide (18.9 g, 196 mmol), tri-tert-butylphosphine (0.8 g, 4 mmol) and toluene (300 ml) were put into a 500 ml reaction vessel, and then the solution was refluxed for 5 hours with stirring. After the reaction was complete, the solution was filtered, and then the filtrate was concentrated. A crude product was purified with column chromatography to give the Intermediate 1-11C (39.9 g, yield: 52%). 
     (2) Synthesis of Compound 1-11 
     
       
         
         
             
             
         
       
     
     The Intermediate 1-11C (9.8 g, 12.5 mmol) and tert-butyl benzene (60 ml) were put into a 500 ml reaction vessel. N-butyl lithium (45 ml, 37.5 mmol) was added dropwisely into the reaction vessel at −78° C., and then the solution was stirred at 60° C. for 3 hours. Nitrogen gas was blown into the reaction vessel at 60° C. to remove a byproduct, boron tribromide (6.3 g, 25 mmol) was added dropwisely to the solution at −78° C., and then the solution was stirred at RT for 1 hour. N,N-diisopropyl ethyl amine (3.2 g, 25 mmol) was added dropwisely to the solution at 0° C., and then the solution was stirred at 120° C. for 2 hours. After the reaction was complete, sodium acetate aqueous solution was added into the reaction vessel at RT, and then the solution was stirred. An organic layer was extracted with ethyl acetate and was concentrated, and then a crude product was purified with column chromatography to give Compound 1-11 (1.4 g, yield: 15%). 
     Synthesis Example 6: Synthesis of Compound 1-12 
     (1) Synthesis of Intermediate 1-12C 
     
       
         
         
             
             
         
       
     
     Compound 1-12A (28.0 g, 98 mmol), Compound 1-12B (51.6 g, 98 mmol), palladium acetate (0.45 g, 2 mmol), sodium tert-butoxide (18.9 g, 196 mmol), tri-tert-butylphosphine (0.8 g, 4 mmol) and toluene (300 ml) were put into a 500 ml reaction vessel, and then the solution was refluxed for 5 hours with stirring. After the reaction was complete, the solution was filtered, and then the filtrate was concentrated. A crude product was purified with column chromatography to give the Intermediate 1-12C (44.1 g, yield: 58%). 
     (2) Synthesis of Compound 1-12 
     
       
         
         
             
             
         
       
     
     The Intermediate 1-12C (9.7 g, 12.5 mmol) and tert-butyl benzene (60 ml) were put into a 500 ml reaction vessel. N-butyl lithium (45 ml, 37.5 mmol) was added dropwisely into the reaction vessel at −78° C., and then the solution was stirred at 60° C. for 3 hours. Nitrogen gas was blown into the reaction vessel at 60° C. to remove a byproduct, boron tribromide (6.3 g, 25 mmol) was added dropwisely to the solution at −78° C., and then the solution was stirred at RT for 1 hour. N,N-diisopropyl ethyl amine (3.2 g, 25 mmol) was added dropwisely to the solution at 0° C., and then the solution was stirred at 120° C. for 2 hours. After the reaction was complete, sodium acetate aqueous solution was added into the reaction vessel at RT, and then the solution was stirred. An organic layer was extracted with ethyl acetate and was concentrated, and then a crude product was purified with column chromatography to give Compound 1-12 (1.7 g, yield: 18%). 
     Synthesis Example 7: Synthesis of Compound 1-13 
     (1) Synthesis of Intermediate 1-13C 
     
       
         
         
             
             
         
       
     
     Compound 1-13A (34.8 g, 98 mmol), Compound 1-13B (46.6 g, 98 mmol), palladium acetate (0.45 g, 2 mmol), sodium tert-butoxide (18.9 g, 196 mmol), tri-tert-butylphosphine (0.8 g, 4 mmol) and toluene (300 ml) were put into a 500 ml reaction vessel, and then the solution was refluxed for 5 hours with stirring. After the reaction was complete, the solution was filtered, and then the filtrate was concentrated. A crude product was purified with column chromatography to give the Intermediate 1-13C (41.3 g, yield: 53%). 
     (2) Synthesis of Compound 1-13 
     
       
         
         
             
             
         
       
     
     The Intermediate 1-13C (9.9 g, 12.5 mmol) and tert-butyl benzene (60 ml) were put into a 500 ml reaction vessel. N-butyl lithium (45 ml, 37.5 mmol) was added dropwisely into the reaction vessel at −78° C., and then the solution was stirred at 60° C. for 3 hours. Nitrogen gas was blown into the reaction vessel at 60° C. to remove a byproduct, boron tribromide (6.3 g, 25 mmol) was added dropwisely to the solution at −78° C., and then the solution was stirred at RT for 1 hour. N,N-diisopropyl ethyl amine (3.2 g, 25 mmol) was added dropwisely to the solution at 0° C., and then the solution was stirred at 120° C. for 2 hours. After the reaction was complete, sodium acetate aqueous solution was added into the reaction vessel at RT, and then the solution was stirred. An organic layer was extracted with ethyl acetate and was concentrated, and then a crude product was purified with column chromatography to give Compound 1-13 (1.4 g, yield: 15%). 
     Synthesis Example 8: Synthesis of Compound 1-17 
     (1) Synthesis of Intermediate 1-17C 
     
       
         
         
             
             
         
       
     
     Compound 1-17A (33.4 g, 98 mmol), Compound 1-17B (46.1 g, 98 mmol), palladium acetate (0.45 g, 2 mmol), sodium tert-butoxide (18.9 g, 196 mmol), tri-tert-butylphosphine (0.8 g, 4 mmol) and toluene (300 ml) were put into a 500 ml reaction vessel, and then the solution was refluxed for 5 hours with stirring. After the reaction was complete, the solution was filtered, and then the filtrate was concentrated. A crude product was purified with column chromatography to give the Intermediate 1-17C (47.1 g, yield: 62%). 
     (2) Synthesis of Compound 1-17 
     
       
         
         
             
             
         
       
     
     The Intermediate 1-17C (9.7 g, 12.5 mmol) and tert-butyl benzene (60 ml) were put into a 500 ml reaction vessel. N-butyl lithium (45 ml, 37.5 mmol) was added dropwisely into the reaction vessel at −78° C., and then the solution was stirred at 60° C. for 3 hours. Nitrogen gas was blown into the reaction vessel at 60° C. to remove a byproduct, boron tribromide (6.3 g, 25 mmol) was added dropwisely to the solution at −78° C., and then the solution was stirred at RT for 1 hour. N,N-diisopropyl ethyl amine (3.2 g, 25 mmol) was added dropwisely to the solution at 0° C., and then the solution was stirred at 120° C. for 2 hours. After the reaction was complete, sodium acetate aqueous solution was added into the reaction vessel at RT, and then the solution was stirred. An organic layer was extracted with ethyl acetate and was concentrated, and then a crude product was purified with column chromatography to give Compound 1-17 (1.6 g, yield: 17%). 
     Synthesis Example 9: Synthesis of Compound 2-1 
     
       
         
         
             
             
         
       
     
     Compound 2-1A (2.0 g, 5.2 mmol), Compound 2-1B (1.5 g, 5.7 mmol), tris(dibenzylideneacetone)dipalladium(0) (Pd 2 (dba) 3 , 0.24 g, 0.26 mmol) and toluene (50 ml) were put into a 250 ml reaction vessel in a dry box. The reaction vessel was removed from the dry box, and then sodium carbonate anhydrous (2M, 20 ml) was added into the solution. The reactants were stirred and heated at 90° C. overnight. The reaction was monitored by HPLC (high-performance liquid chromatography). After the solution was cooled to RT, an organic layer was separated. An aqueous layer was washed with dichloromethane and the organic layer was concentrated with rotary evaporation to obtain a gray powder. The gray powder was purified with alumina, precipitated with hexane, and purified with silica-gel column chromatography to give Compound 2-1 (2.3 g, yield: 86%) of white powder. 
     Synthesis Example 10: Synthesis of Compound 2-2 
     
       
         
         
             
             
         
       
     
     Compound 2-2A (2.0 g, 5.2 mmol), Compound 2-2B (1.5 g, 5.7 mmol), Pd 2 (dba) 3  (0.24 g, 0.26 mmol) and toluene (50 ml) were put into a 250 ml reaction vessel in a dry box. The reaction vessel was removed from the dry box, and then sodium carbonate anhydrous (2M, 20 ml) was added into the solution. The reactants were stirred and heated at 90° C. overnight. The reaction was monitored by HPLC. After the solution was cooled to RT, an organic layer was separated. An aqueous layer was washed with dichloromethane and the organic layer was concentrated with rotary evaporation to obtain a gray powder. The gray powder was purified with alumina, precipitated with hexane, and purified with silica-gel column chromatography to give Compound 2-2 (2.0 g, yield: 89%) of white powder. 
     Synthesis Example 11: Synthesis of Compound 2-3 
     
       
         
         
             
             
         
       
     
     Compound 2-3A (2.0 g, 6.0 mmol), Compound 2-3B (1.9 g, 6.6 mmol), Pd 2 (dba) 3  (0.3 g, 0.3 mmol) and toluene (50 ml) were put into a 250 ml reaction vessel in a dry box. The reaction vessel was removed from the dry box, and then sodium carbonate anhydrous (2M, 20 ml) was added into the solution. The reactants were stirred and heated at 90° C. overnight. The reaction was monitored by HPLC. After the solution was cooled to RT, an organic layer was separated. An aqueous layer was washed with dichloromethane and the organic layer was concentrated with rotary evaporation to obtain a gray powder. The gray powder was purified with alumina, precipitated with hexane, and purified with silica-gel column chromatography to give Compound 2-3 (2.0 g, yield: 79%) of white powder. 
     Synthesis Example 12: Synthesis of Compound 2-4 
     
       
         
         
             
             
         
       
     
     Compound 2-4A (2.0 g, 6.0 mmol), Compound 2-4B (2.4 g, 6.6 mmol), Pd 2 (dba) 3  (0.3 g, 0.3 mmol) and toluene (50 ml) were put into a 250 ml reaction vessel in a dry box. The reaction vessel was removed from the dry box, and then sodium carbonate anhydrous (2M, 20 ml) was added into the solution. The reactants were stirred and heated at 90° C. overnight. The reaction was monitored by HPLC. After the solution was cooled to RT, an organic layer was separated. An aqueous layer was washed with dichloromethane and the organic layer was concentrated with rotary evaporation to obtain a gray powder. The gray powder was purified with alumina, precipitated with hexane, and purified with silica-gel column chromatography to give Compound 2-4 (2.0 g, yield: 67%) of white powder. 
     Synthesis Example 13: Synthesis of Compound 2-5 
     
       
         
         
             
             
         
       
     
     Compound 2-5A (2.0 g, 5.2 mmol), Compound 2-5B (2.0 g, 5.7 mmol), Pd 2 (dba) 3  (0.24 g, 0.26 mmol) and toluene (50 ml) were put into a 250 ml reaction vessel in a dry box. The reaction vessel was removed from the dry box, and then sodium carbonate anhydrous (2M, 20 ml) was added into the solution. The reactants were stirred and heated at 90° C. overnight. The reaction was monitored by HPLC. After the solution was cooled to RT, an organic layer was separated. An aqueous layer was washed with dichloromethane and the organic layer was concentrated with rotary evaporation to obtain a gray powder. The gray powder was purified with alumina, precipitated with hexane, and purified with silica-gel column chromatography to give Compound 2-5 (2.0 g, yield: 81%) of white powder. 
     Synthesis Example 14: Synthesis of Compound 2-6 
     
       
         
         
             
             
         
       
     
     Compound 2-6A (2.0 g, 5.2 mmol), Compound 2-6B (2.0 g, 5.7 mmol), Pd 2 (dba) 3  (0.24 g, 0.26 mmol) and toluene (50 ml) were put into a 250 ml reaction vessel in a dry box. The reaction vessel was removed from the dry box, and then sodium carbonate anhydrous (2M, 20 ml) was added into the solution. The reactants were stirred and heated at 90° C. overnight. The reaction was monitored by HPLC. After the solution was cooled to RT, an organic layer was separated. An aqueous layer was washed with dichloromethane and the organic layer was concentrated with rotary evaporation to obtain a gray powder. The gray powder was purified with alumina, precipitated with hexane, and purified with silica-gel column chromatography to give Compound 2-6 (2.0 g, yield: 81%) of white powder. 
     Synthesis Example 15: Synthesis of Compound 2-7 
     
       
         
         
             
             
         
       
     
     Aluminum chloride (0.5 g, 3.6 mmol) was added into a solution of Compound 2-1 (5.0 g, 9.9 mmol) dissolved in perdeuterobenzene (100 ml) under nitrogen atmosphere. Obtained mixture was stirred at RT for 6 hours, and then D 2 O (50 ml) was added into the mixture. After an organic layer was separated from an aqueous layer, the aqueous layer was washed with dichloromethane (30 ml). The obtained organic layer was dried with MgSO 4  and volatile components were removed by rotary evaporation. A crude product was purified with column chromatography to give Compound 2-7 (4.5 g, yield: 85%) of white powder. 
     Synthesis Example 16: Synthesis of Compound 2-8 
     
       
         
         
             
             
         
       
     
     Aluminum chloride (0.9 g, 4.3 mmol) was added into a solution of Compound 2-2 (5.0 g, 11.6 mmol) dissolved in perdeuterobenzene (120 ml) under nitrogen atmosphere. Obtained mixture was stirred at RT for 6 hours, and then D 2 O (70 ml) was added into the mixture. After an organic layer was separated from an aqueous layer, the aqueous layer was washed with dichloromethane (50 ml). The obtained organic layer was dried with MgSO 4  and volatile components were removed by rotary evaporation. A crude product was purified with column chromatography to give Compound 2-8 (4.0 g, yield: 76%) of white powder. 
     Synthesis Example 17: Synthesis of Compound 2-9 
     
       
         
         
             
             
         
       
     
     Aluminum chloride (0.9 g, 4.3 mmol) was added into a solution of Compound 2-3 (5.0 g, 11.9 mmol) dissolved in perdeuterobenzene (120 ml) under nitrogen atmosphere. Obtained mixture was stirred at RT for 6 hours, and then D 2 O (70 ml) was added into the mixture. After an organic layer was separated from an aqueous layer, the aqueous layer was washed with dichloromethane (50 ml). The obtained organic layer was dried with MgSO 4  and volatile components were removed by rotary evaporation. A crude product was purified with column chromatography to give Compound 2-9 (3.0 g, yield: 57%) of white powder. 
     Synthesis Example 18: Synthesis of Compound 2-10 
     
       
         
         
             
             
         
       
     
     Aluminum chloride (0.9 g, 4.3 mmol) was added into a solution of Compound 2-4 (5.0 g, 10.1 mmol) dissolved in perdeuterobenzene (120 ml) under nitrogen atmosphere. Obtained mixture was stirred at RT for 6 hours, and then D 2 O (70 ml) was added into the mixture. After an organic layer was separated from an aqueous layer, the aqueous layer was washed with dichloromethane (50 ml). The obtained organic layer was dried with MgSO 4  and volatile components were removed by rotary evaporation. A crude product was purified with column chromatography to give Compound 2-10 (3.5 g, yield: 67%) of white powder. 
     Synthesis Example 19: Synthesis of Compound 2-11 
     
       
         
         
             
             
         
       
     
     Aluminum chloride (0.9 g, 4.3 mmol) was added into a solution of Compound 2-5 (5.0 g, 10.6 mmol) dissolved in perdeuterobenzene (120 ml) under nitrogen atmosphere. Obtained mixture was stirred at RT for 6 hours, and then D 2 O (70 ml) was added into the mixture. After an organic layer was separated from an aqueous layer, the aqueous layer was washed with dichloromethane (50 ml). The obtained organic layer was dried with MgSO 4  and volatile components were removed by rotary evaporation. A crude product was purified with column chromatography to give Compound 2-11 (4.0 g, yield: 77%) of white powder. 
     Synthesis Example 20: Synthesis of Compound 2-12 
     
       
         
         
             
             
         
       
     
     Aluminum chloride (0.9 g, 4.3 mmol) was added into a solution of Compound 2-6 (5.0 g, 10.6 mmol) dissolved in perdeuterobenzene (120 ml) under nitrogen atmosphere. Obtained mixture was stirred at RT for 6 hours, and then D 2 O (70 ml) was added into the mixture. After an organic layer was separated from an aqueous layer, the aqueous layer was washed with dichloromethane (50 ml). The obtained organic layer was dried with MgSO 4  and volatile components were removed by rotary evaporation. A crude product was purified with column chromatography to give Compound 2-12 (4.3 g, yield: 82%) of white powder. 
     Fabrication of Organic Light Emitting Diode (OLED) 1 
     A glass substrate (40 mm×40 mm×0.5 mm) onto which ITO was coated as a thin film was washed and ultrasonically cleaned by solvent such as isopropyl alcohol, acetone and distilled water for 5 minutes and dried at 100° C. oven. After cleaning the substrate, the substrate was treated with O 2  plasma under vacuum for 2 minutes and then transferred to a vacuum chamber for depositing emission layer. Subsequently, an emissive layer and a cathode were deposited by evaporation from a heating boat under about 5˜7×10 −7  Torr with a deposition rate of 1 Å/s as the following order: 
     An HIL (Formula 11 (97 wt %) and Formula 12 (3 wt %), 100 Å); an HTL (Formula 11, 100 Å); an EBL (H23 in Formula 6, 100 Å); an EML (Host (H, 98 wt %) and Dopant (D, 2 wt %), 200 Å); an HBL (E1 in Formula 8, 100 Å); an EIL (Formula 13 (98 wt %), Li (2 wt %), 200 Å); and a cathode (Al, 500 Å). 
     And then, the OLED was encapsulated with UV-curable epoxy and moisture getter. 
     Comparative Examples 1-8 (Ref.1-8): Fabrication of OLED 
     An OLED where the EML includes Compound 2-1 as a host and each of Compound 1-1 (Ref.1), Compound 1-4 (Ref.2), Compound 1-6 (Ref.3), Compound 1-8 (Ref.4), Compound 1-11 (Ref.5), Compound 1-12 (Ref.6), Compound 1-13 (Ref.7) and Compound 1-17 (Ref.8) in Formula 3 as a dopant, respectively, was fabricated. 
     Comparative Examples 9-16 (Ref.9-16): Fabrication of OLED 
     An OLED where the EML includes Compound 2-2 as a host and each of Compound 1-1 (Ref.9), Compound 1-4 (Ref.10), Compound 1-6 (Ref.11), Compound 1-8 (Ref.12), Compound 1-11 (Ref.13), Compound 1-12 (Ref.14), Compound 1-13 (Ref.15) and Compound 1-17 (Ref.18) in Formula 3 as a dopant, respectively, was fabricated. 
     Experimental Example 1: Measurement of Luminous Properties of OLEDs 
     Each of the OLEDs, having 9 mm 2  of emission area, fabricated in Comparative Examples 1 to 16 connected to an external power source and then luminous properties for all the OLEDs were evaluated using a constant current source (KEITHILEY) and a photometer PR650 at room temperature. In particular, driving voltage (V), current efficiency (cd/A) and CIE color coordinates at a current density of 10 mA/cm 2  and time period (T 95 ) at which the luminance was reduced to 95% from initial luminance at 40° C. and at a current density of 22.5 mA/m 2 . The measurement results are indicated in the following Table 1. 
     
       
         
           
               
             
               
                 TABLE 1 
               
             
            
               
                   
               
               
                 Luminous Properties of OLED 
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Sample 
                 Dopant 
                 Host 
                 V 
                 EQE (%) 
                 CIE(x,y) 
                 T 95  (hr) 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Ref. 1 
                 1-1 
                 2-1 
                 3.99 
                 6.35 
                 (0.140, 0.061) 
                 63 
               
               
                 Ref. 2 
                 1-4 
                 2-1 
                 3.94 
                 6.33 
                 (0.131, 0.089) 
                 68 
               
               
                 Ref. 3 
                 1-6 
                 2-1 
                 3.90 
                 6.61 
                 (0.139, 0.074) 
                 88 
               
               
                 Ref. 4 
                 1-8 
                 2-1 
                 3.88 
                 6.63 
                 (0.137, 0.079) 
                 82 
               
               
                 Ref. 5 
                 1-11 
                 2-1 
                 3.89 
                 6.61 
                 (0.140, 0.074) 
                 101 
               
               
                 Ref. 6 
                 1-12 
                 2-1 
                 3.90 
                 6.59 
                 (0.140, 0.073) 
                 95 
               
               
                 Ref. 7 
                 1-13 
                 2-1 
                 3.91 
                 6.64 
                 (0.137, 0.080) 
                 94 
               
               
                 Ref. 8 
                 1-17 
                 2-1 
                 3.91 
                 6.58 
                 (0.137, 0.079) 
                 89 
               
               
                 Ref. 9 
                 1-1 
                 2-2 
                 4.20 
                 6.24 
                 (0.140, 0.060) 
                 69 
               
               
                 Ref. 10 
                 1-4 
                 2-2 
                 4.20 
                 6.22 
                 (0.131, 0.090) 
                 74 
               
               
                 Ref. 11 
                 1-6 
                 2-2 
                 4.15 
                 6.49 
                 (0.138, 0.074) 
                 96 
               
               
                 Ref. 12 
                 1-8 
                 2-2 
                 4.19 
                 6.51 
                 (0.137, 0.079) 
                 106 
               
               
                 Ref. 13 
                 1-11 
                 2-2 
                 4.20 
                 6.50 
                 (0.140, 0.074) 
                 110 
               
               
                 Ref. 14 
                 1-12 
                 2-2 
                 4.21 
                 6.47 
                 (0.141, 0.074) 
                 103 
               
               
                 Ref. 15 
                 1-13 
                 2-2 
                 4.20 
                 6.53 
                 (0.138, 0.080) 
                 102 
               
               
                 Ref. 16 
                 1-17 
                 2-2 
                 4.19 
                 6.47 
                 (0.137, 0.079) 
                 96 
               
               
                   
               
            
           
         
       
     
     Comparative Examples 17-24 (Ref.17-24): Fabrication of OLED 
     An OLED where the EML includes Compound 2-3 as a host and Compound 1-1 (Ref.17), Compound 1-4 (Ref.18), Compound 1-6 (Ref.19), Compound 1-8 (Ref.20), Compound 1-11 (Ref.21), Compound 1-12 (Ref.22), Compound 1-13 (Ref.23) and Compound 1-17 (Ref.24) in Formula 3 as a dopant, respectively, was fabricated. 
     Comparative Examples 25-32 (Ref.25-32): Fabrication of OLED 
     An OLED where the EML includes Compound 2-4 as a host and Compound 1-1 (Ref.25), Compound 1-4 (Ref.26), Compound 1-6 (Ref.27), Compound 1-8 (Ref.28), Compound 1-11 (Ref.29), Compound 1-12 (Ref.30), Compound 1-13 (Ref.31) and Compound 1-17 (Ref.32) in Formula 3 as a dopant, respectively, was fabricated. 
     Experimental Example 2: Measurement of Luminous Properties of OLEDs 
     Luminous properties for each of the OLEDs fabricated in Comparative Examples 17-32 were measured using the same procedure as in Experimental Example 1. The measurement results are indicated in the following Table 2. 
     
       
         
           
               
             
               
                 TABLE 2 
               
             
            
               
                   
               
               
                 Luminous Properties of OLEDs 
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Sample 
                 Dopant 
                 Host 
                 V 
                 EQE (%) 
                 CIE(x,y) 
                 T 95  (hr) 
               
               
                   
               
               
                 Ref. 17 
                 1-1 
                 2-3 
                 3.80 
                 6.21 
                 (0.140, 0.063) 
                 56 
               
               
                 Ref. 18 
                 1-4 
                 2-3 
                 3.79 
                 6.17 
                 (0.130, 0.092) 
                 61 
               
               
                 Ref. 19 
                 1-6 
                 2-3 
                 3.80 
                 6.45 
                 (0.139, 0.076) 
                 79 
               
               
                 Ref. 20 
                 1-8 
                 2-3 
                 3.78 
                 6.47 
                 (0.138, 0.081) 
                 73 
               
               
                 Ref. 21 
                 1-11 
                 2-3 
                 3.78 
                 6.46 
                 (0.141, 0.075) 
                 90 
               
               
                 Ref. 22 
                 1-12 
                 2-3 
                 3.78 
                 6.44 
                 (0.141, 0.075) 
                 85 
               
               
                 Ref. 23 
                 1-13 
                 2-3 
                 3.80 
                 6.49 
                 (0.136, 0.081) 
                 84 
               
               
                 Ref. 24 
                 1-17 
                 2-3 
                 3.79 
                 6.42 
                 (0.136, 0.081) 
                 79 
               
               
                 Ref. 25 
                 1-1 
                 2-4 
                 3.80 
                 6.22 
                 (0.139, 0.062) 
                 56 
               
               
                 Ref. 26 
                 1-4 
                 2-4 
                 3.79 
                 6.20 
                 (0.131, 0.092) 
                 60 
               
               
                 Ref. 27 
                 1-6 
                 2-4 
                 3.80 
                 6.43 
                 (0.137, 0.081) 
                 80 
               
               
                 Ref. 28 
                 1-8 
                 2-4 
                 3.79 
                 6.42 
                 (0.136, 0.084) 
                 73 
               
               
                 Ref. 29 
                 1-11 
                 2-4 
                 3.81 
                 6.47 
                 (0.139, 0.076) 
                 91 
               
               
                 Ref. 30 
                 1-12 
                 2-4 
                 3.80 
                 6.44 
                 (0.139, 0.077) 
                 84 
               
               
                 Ref. 31 
                 1-13 
                 2-4 
                 3.79 
                 6.50 
                 (0.136, 0.084) 
                 83 
               
               
                 Ref. 32 
                 1-17 
                 2-4 
                 3.80 
                 6.43 
                 (0.135, 0.087) 
                 80 
               
               
                   
               
            
           
         
       
     
     Comparative Examples 33-40 (Ref.33-40): Fabrication of OLED 
     An OLED where the EML includes Compound 2-5 as a host and Compound 1-1 (Ref.33), Compound 1-4 (Ref.34), Compound 1-6 (Ref.35), Compound 1-8 (Ref.36), Compound 1-11 (Ref.37), Compound 1-12 (Ref.38), Compound 1-13 (Ref.39) and Compound 1-17 (Ref.40) in Formula 3 as a dopant, respectively, was fabricated. 
     Comparative Examples 41-48 (Ref.41-48): Fabrication of OLED 
     An OLED where the EML includes Compound 2-6 as a host and Compound 1-1 (Ref.41), Compound 1-4 (Ref.42), Compound 1-6 (Ref.43), Compound 1-8 (Ref.44), Compound 1-11 (Ref.45), Compound 1-12 (Ref.46), Compound 1-13 (Ref.47) and Compound 1-17 (Ref.48) in Formula 3 as a dopant, respectively, was fabricated. 
     Experimental Example 3: Measurement of Luminous Properties of OLEDs 
     Luminous properties for each of the OLEDs fabricated in Comparative Examples 33-48 were measured using the same procedure as in Experimental Example 1. The measurement results are indicated in the following Table 3. 
     
       
         
           
               
             
               
                 TABLE 3 
               
             
            
               
                   
               
               
                 Luminous Properties of OLEDs 
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Sample 
                 Dopant 
                 Host 
                 V 
                 EQE (%) 
                 CIE(x,y) 
                 T 95  (hr) 
               
               
                   
               
               
                 Ref. 33 
                 1-1 
                 2-5 
                 3.65 
                 6.15 
                 (0.140, 0.064) 
                 51 
               
               
                 Ref. 34 
                 1-4 
                 2-5 
                 3.61 
                 6.12 
                 (0.130, 0.094) 
                 55 
               
               
                 Ref. 35 
                 1-6 
                 2-5 
                 3.62 
                 6.10 
                 (0.138, 0.082) 
                 75 
               
               
                 Ref. 36 
                 1-8 
                 2-5 
                 3.60 
                 6.12 
                 (0.138, 0.085) 
                 68 
               
               
                 Ref. 37 
                 1-11 
                 2-5 
                 3.62 
                 6.10 
                 (0.141, 0.080) 
                 86 
               
               
                 Ref. 38 
                 1-12 
                 2-5 
                 3.63 
                 6.15 
                 (0.141, 0.080) 
                 79 
               
               
                 Ref. 39 
                 1-13 
                 2-5 
                 3.62 
                 6.15 
                 (0.136, 0.085) 
                 78 
               
               
                 Ref. 40 
                 1-17 
                 2-5 
                 3.63 
                 6.16 
                 (0.136, 0.088) 
                 75 
               
               
                 Ref. 41 
                 1-1 
                 2-6 
                 3.65 
                 6.16 
                 (0.140, 0.064) 
                 50 
               
               
                 Ref. 42 
                 1-4 
                 2-6 
                 3.60 
                 6.13 
                 (0.130, 0.094) 
                 54 
               
               
                 Ref. 43 
                 1-6 
                 2-6 
                 3.61 
                 6.11 
                 (0.138, 0.082) 
                 76 
               
               
                 Ref. 44 
                 1-8 
                 2-6 
                 3.59 
                 6.11 
                 (0.138, 0.085) 
                 69 
               
               
                 Ref. 45 
                 1-11 
                 2-6 
                 3.61 
                 6.11 
                 (0.141, 0.080) 
                 85 
               
               
                 Ref. 46 
                 1-12 
                 2-6 
                 3.62 
                 6.14 
                 (0.141, 0.080) 
                 80 
               
               
                 Ref. 47 
                 1-13 
                 2-6 
                 3.61 
                 6.14 
                 (0.136, 0.085) 
                 79 
               
               
                 Ref. 48 
                 1-17 
                 2-6 
                 3.62 
                 6.15 
                 (0.136, 0.088) 
                 76 
               
               
                   
               
            
           
         
       
     
     Examples 1-8 (Ex.1-8): Fabrication of OLED 
     An OLED where the EML includes Compound 2-7 as a host and Compound 1-1 (Ex.1), Compound 1-4 (Ex.2), Compound 1-6 (Ex.3), Compound 1-8 (Ex.4), Compound 1-11 (Ex.5), Compound 1-12 (Ex.6), Compound 1-13 (Ex.7) and Compound 1-17 (Ex.8) in Formula 3 as a dopant, respectively, was fabricated. 
     Examples 9-16 (Ref.9-16): Fabrication of OLED 
     An OLED where the EML includes Compound 2-8 as a host and Compound 1-1 (Ex.9), Compound 1-4 (Ex.10), Compound 1-6 (Ex.11), Compound 1-8 (Ex.12), Compound 1-11 (Ex.13), Compound 1-12 (Ex.14), Compound 1-13 (Ex.15) and Compound 1-17 (Ex.16) in Formula 3 as a dopant, respectively, was fabricated. 
     Experimental Example 4: Measurement of Luminous Properties of OLEDs 
     Luminous properties for each of the OLEDs fabricated in Examples 1-16 were measured using the same procedure as in Experimental Example 1. The measurement results are indicated in the following Table 4. 
     
       
         
           
               
             
               
                 TABLE 4 
               
             
            
               
                   
               
               
                 Luminous Properties of OLEDs 
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Sample 
                 Dopant 
                 Host 
                 V 
                 EQE (%) 
                 CIE(x,y) 
                 T 95  (hr) 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Ex. 1 
                 1-1 
                 2-7 
                 3.98 
                 6.28 
                 (0.140, 0.060) 
                 95 
               
               
                 Ex. 2 
                 1-4 
                 2-7 
                 3.95 
                 6.30 
                 (0.131, 0.089) 
                 102 
               
               
                 Ex. 3 
                 1-6 
                 2-7 
                 3.91 
                 6.57 
                 (0.140, 0.074) 
                 133 
               
               
                 Ex. 4 
                 1-8 
                 2-7 
                 3.88 
                 6.59 
                 (0.137, 0.080) 
                 123 
               
               
                 Ex. 5 
                 1-11 
                 2-7 
                 3.89 
                 6.60 
                 (0.139, 0.074) 
                 151 
               
               
                 Ex. 6 
                 1-12 
                 2-7 
                 3.89 
                 6.54 
                 (0.140, 0.072) 
                 142 
               
               
                 Ex. 7 
                 1-13 
                 2-7 
                 3.90 
                 6.62 
                 (0.137, 0.079) 
                 141 
               
               
                 Ex. 8 
                 1-17 
                 2-7 
                 3.91 
                 6.55 
                 (0.137, 0.079) 
                 133 
               
               
                 Ex. 9 
                 1-1 
                 2-8 
                 4.21 
                 6.19 
                 (0.140, 0.061) 
                 103 
               
               
                 Ex. 10 
                 1-4 
                 2-8 
                 4.20 
                 6.20 
                 (0.131, 0.089) 
                 111 
               
               
                 Ex. 11 
                 1-6 
                 2-8 
                 4.16 
                 6.47 
                 (0.139, 0.074) 
                 144 
               
               
                 Ex. 12 
                 1-8 
                 2-8 
                 4.20 
                 6.48 
                 (0.137, 0.078) 
                 159 
               
               
                 Ex. 13 
                 1-11 
                 2-8 
                 4.20 
                 6.45 
                 (0.140, 0.074) 
                 165 
               
               
                 Ex. 14 
                 1-12 
                 2-8 
                 4.20 
                 6.32 
                 (0.141, 0.073) 
                 154 
               
               
                 Ex. 15 
                 1-13 
                 2-8 
                 4.19 
                 6.51 
                 (0.138, 0.079) 
                 153 
               
               
                 Ex. 16 
                 1-17 
                 2-8 
                 4.20 
                 6.33 
                 (0.137, 0.078) 
                 144 
               
               
                   
               
            
           
         
       
     
     Examples 17-24 (Ex.17-24): Fabrication of OLED 
     An OLED where the EML includes Compound 2-9 as a host and Compound 1-1 (Ex.17), Compound 1-4 (Ex.18), Compound 1-6 (Ex.19), Compound 1-8 (Ex.20), Compound 1-11 (Ex.21), Compound 1-12 (Ex.22), Compound 1-13 (Ex.23) and Compound 1-17 (Ex.24) in Formula 3 as a dopant, respectively, was fabricated. 
     Examples 25-32 (Ref.25-32): Fabrication of OLED 
     An OLED where the EML includes Compound 2-10 as a host and Compound 1-1 (Ex.25), Compound 1-4 (Ex.26), Compound 1-6 (Ex.27), Compound 1-8 (Ex.28), Compound 1-11 (Ex.29), Compound 1-12 (Ex.30), Compound 1-13 (Ex.31) and Compound 1-17 (Ex.32) in Formula 3 as a dopant, respectively, was fabricated. 
     Experimental Example 5: Measurement of Luminous Properties of OLEDs 
     Luminous properties for each of the OLEDs fabricated in Examples 17-32 were measured using the same procedure as in Experimental Example 1. The measurement results are indicated in the following Table 5. 
     
       
         
           
               
             
               
                 TABLE 5 
               
             
            
               
                   
               
               
                 Luminous Properties of OLEDs 
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Sample 
                 Dopant 
                 Host 
                 V 
                 EQE (%) 
                 CIE(x,y) 
                 T 95  (hr) 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Ex. 17 
                 1-1 
                 2-9 
                 3.81 
                 6.21 
                 (0.139, 0.062) 
                 84 
               
               
                 Ex. 18 
                 1-4 
                 2-9 
                 3.80 
                 6.19 
                 (0.131, 0.092) 
                 90 
               
               
                 Ex. 19 
                 1-6 
                 2-9 
                 3.79 
                 6.42 
                 (0.137, 0.081) 
                 120 
               
               
                 Ex. 20 
                 1-8 
                 2-9 
                 3.78 
                 6.41 
                 (0.136, 0.084) 
                 109 
               
               
                 Ex. 21 
                 1-11 
                 2-9 
                 3.80 
                 6.45 
                 (0.139, 0.076) 
                 136 
               
               
                 Ex. 22 
                 1-12 
                 2-9 
                 3.81 
                 6.42 
                 (0.139, 0.077) 
                 126 
               
               
                 Ex. 23 
                 1-13 
                 2-9 
                 3.80 
                 6.49 
                 (0.136, 0.084) 
                 124 
               
               
                 Ex. 24 
                 1-17 
                 2-9 
                 3.80 
                 6.41 
                 (0.135, 0.087) 
                 120 
               
               
                 Ex. 25 
                 1-1 
                 2-10 
                 3.80 
                 6.21 
                 (0.139, 0.062) 
                 84 
               
               
                 Ex. 26 
                 1-4 
                 2-10 
                 3.79 
                 6.22 
                 (0.131, 0.092) 
                 90 
               
               
                 Ex. 27 
                 1-6 
                 2-10 
                 3.80 
                 6.42 
                 (0.137, 0.081) 
                 120 
               
               
                 Ex. 28 
                 1-8 
                 2-10 
                 3.79 
                 6.41 
                 (0.136, 0.084) 
                 109 
               
               
                 Ex. 29 
                 1-11 
                 2-10 
                 3.81 
                 6.45 
                 (0.139, 0.076) 
                 136 
               
               
                 Ex. 30 
                 1-12 
                 2-10 
                 3.80 
                 6.45 
                 (0.139, 0.077) 
                 126 
               
               
                 Ex. 31 
                 1-13 
                 2-10 
                 3.79 
                 6.49 
                 (0.136, 0.084) 
                 124 
               
               
                 Ex. 32 
                 1-17 
                 2-10 
                 3.80 
                 6.42 
                 (0.135, 0.087) 
                 120 
               
               
                   
               
            
           
         
       
     
     Examples 33-40 (Ex.33-40): Fabrication of OLED 
     An OLED where the EML includes Compound 2-11 as a host and Compound 1-1 (Ex.33), Compound 1-4 (Ex.34), Compound 1-6 (Ex.35), Compound 1-8 (Ex.36), Compound 1-11 (Ex.37), Compound 1-12 (Ex.38), Compound 1-13 (Ex.39) and Compound 1-17 (Ex.40) in Formula 3 as a dopant, respectively, was fabricated. 
     Examples 41-48 (Ref.41-48): Fabrication of OLED 
     An OLED where the EML includes Compound 2-12 as a host and Compound 1-1 (Ex.41), Compound 1-4 (Ex.42), Compound 1-6 (Ex.43), Compound 1-8 (Ex.44), Compound 1-11 (Ex.45), Compound 1-12 (Ex.46), Compound 1-13 (Ex.47) and Compound 1-17 (Ex.48) in Formula 3 as a dopant, respectively, was fabricated. 
     Experimental Example 6: Measurement of Luminous Properties of OLEDs 
     Luminous properties for each of the OLEDs fabricated in Examples 33-48 were measured using the same procedure as in Experimental Example 1. The measurement results are indicated in the following Table 6. 
     
       
         
           
               
             
               
                 TABLE 6 
               
             
            
               
                   
               
               
                 Luminous Properties of OLEDs 
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Sample 
                 Dopant 
                 Host 
                 V 
                 EQE (%) 
                 CIE(x,y) 
                 T 95  (hr) 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Ex. 33 
                 1-1 
                 2-11 
                 3.64 
                 6.14 
                 (0.140, 0.064) 
                 76 
               
               
                 Ex. 34 
                 1-4 
                 2-11 
                 3.62 
                 6.11 
                 (0.130, 0.094) 
                 82 
               
               
                 Ex. 35 
                 1-6 
                 2-11 
                 3.61 
                 6.09 
                 (0.138, 0.082) 
                 112 
               
               
                 Ex. 36 
                 1-8 
                 2-11 
                 3.61 
                 6.11 
                 (0.138, 0.085) 
                 102 
               
               
                 Ex. 37 
                 1-11 
                 2-11 
                 3.61 
                 6.11 
                 (0.141, 0.080) 
                 129 
               
               
                 Ex. 38 
                 1-12 
                 2-11 
                 3.62 
                 6.14 
                 (0.141, 0.080) 
                 119 
               
               
                 Ex. 39 
                 1-13 
                 2-11 
                 3.63 
                 6.13 
                 (0.136, 0.085) 
                 117 
               
               
                 Ex. 40 
                 1-17 
                 2-11 
                 3.64 
                 6.15 
                 (0.136, 0.088) 
                 112 
               
               
                 Ex. 41 
                 1-1 
                 2-12 
                 3.64 
                 6.15 
                 (0.140, 0.064) 
                 75 
               
               
                 Ex. 42 
                 1-4 
                 2-12 
                 3.61 
                 6.14 
                 (0.130, 0.094) 
                 81 
               
               
                 Ex. 43 
                 1-6 
                 2-12 
                 3.60 
                 6.12 
                 (0.138, 0.082) 
                 114 
               
               
                 Ex. 44 
                 1-8 
                 2-12 
                 3.58 
                 6.12 
                 (0.138, 0.085) 
                 103 
               
               
                 Ex. 45 
                 1-11 
                 2-12 
                 3.60 
                 6.12 
                 (0.141, 0.080) 
                 127 
               
               
                 Ex. 46 
                 1-12 
                 2-12 
                 3.61 
                 6.13 
                 (0.141, 0.080) 
                 120 
               
               
                 Ex. 47 
                 1-13 
                 2-12 
                 3.60 
                 6.15 
                 (0.136, 0.085) 
                 118 
               
               
                 Ex. 48 
                 1-17 
                 2-12 
                 3.61 
                 6.14 
                 (0.136, 0.088) 
                 114 
               
               
                   
               
            
           
         
       
     
     Summarizing the results in Tables 1 to 6, compared to the OLEDs fabricated in Ref.1 to Ref.48 where the EML includes a non-deuterated anthracene-based compound (Compounds 2-1 to Compound 2-6) as the host, the OLEDs fabricated in Ex.1 to Ex.48 where the EML includes a deuterated anthracene-based compound (Compounds 2-7 to Compound 2-12) as the host improved their luminous efficiency and luminous lifespan. 
     In addition, compared to the OLEDs fabricated in Ex.17-48, the OLEDs fabricated in Ex.1-8 where the EML includes the Compound 2-7 as the host and the OLEDs fabricated in Ex. 9-16 wherein the EML includes the Compound 2-9 as the host improved their luminous efficiency and luminous lifespan. In other words, when the anthracene-based compound, where a naphthyl moiety (1-naphthyl) is linked directly to one side of an anthracene moiety and other naphthyl moiety (2-naphthyl) is linked directly or via a bridging group (linker) to the other side of the anthracene moiety and is deuterated, are used as the host in the EML, the luminous efficiency and the luminous lifespan of the OLEDs are further increased. 
     Also, compared to the OLEDs fabricated in Ex.1-8 where the EML includes the Compound 2-7 as the host, the OLEDs fabricated in Ex.9-16 where the EML includes the Compound 2-8 as the host showed sufficient luminous lifespan. On the contrary, the OLEDs where the EML includes the Compound 2-7 as the host lowered their driving voltages. In other words, the OLEDs where the EML includes the anthracene-based compound, where a naphthyl moiety (1-naphthyl) is linked to directly to one side of the anthracene moiety and the other naphthyl moiety (2-naphthyl) is linked directly or via the bridging group and is deuterated, lowered its driving voltage and improved their luminous efficiency and luminous lifespan. 
     Also, compared to the OLEDs where the EML includes the boron-based compound having symmetrical chemical structure (Compounds 1-1 and 1-4) as the dopant, the OLEDs where the EML includes the boron-based compound having asymmetrical chemical structure (Compounds 1-6 and 1-8) as the dopant improved their luminous efficiency and luminous lifespan. 
     In addition, the OLEDs where the EML includes the boron-based compound which is deuterated and having the asymmetric structure (Compounds, 1-11, 1-12, 1-13 and 1-17) as the dopant enhanced their luminous efficiency and luminous lifespan further. Particularly, when the HIL and the HTL includes the compound in Formula 11 and the EBL includes the amine-based compound of Formula 5, the OLED can improve its luminous properties. 
     Fabrication of Organic Light Emitting Diode (OLED) 2 
     A glass substrate (40 mm×40 mm×0.5 mm) onto which ITO was coated as a thin film was washed and ultrasonically cleaned by solvent such as isopropyl alcohol, acetone and distilled water for 5 minutes and dried at 100° C. oven. After cleaning the substrate, the substrate was treated with O 2  plasma under vacuum for 2 minutes and then transferred to a vacuum chamber for depositing emission layer. Subsequently, an emissive layer and a cathode were deposited by evaporation from a heating boat under about 5˜7×10 −7  Torr with a deposition rate of 1 Λ/s as the following order: 
     An HIL (Formula 11 (97 wt %) and Formula 12 (3 wt %), 100 Å); an HTL (Formula 11, 100 Å); an EBL (100 Å); an EML (Host (H, 98 wt %) and Dopant (D, 2 wt %), 200 Å); an HBL (100 Å); an EIL (Formula 13 (98 wt %), Li (2 wt %), 200 Å); and a cathode (Al, 500 Å). 
     And then, the OLED was encapsulated with UV-curable epoxy and moisture getter. 
     Comparative Example 49 (Ref.49): Fabrication of OLED 
     An OLED where the EBL includes the following Ref.EBL, the EML includes Compound 1-1 (dopant) in Formula 2 and Compound 2-1 (host) and the HBL includes the following Ref.HBL was fabricated. 
     Examples 49-56 (Ex.49-56): Fabrication of OLEDs 
     An OLED where the EML includes the Compound 1-1 (dopant) in Formula 2 and Compound 2-7 (host) in Formula 4, the EBL includes the following Ref.EBL (Ex.49-51), H4 in Formula 6 (Ex.52-54) or H3 in Formula 6 (Ex.55-57), and the HBL includes the following Ref.HBL (Ex.49, 52 and 55), E1 in Formula 8 (Ex.50, 53 and 56) or F1 in Formula 10 (Ex.51, 54 and 57), respectively, were fabricated. 
     
       
         
         
             
             
         
       
     
     Experimental Example 7: Measurement of Luminous Properties of OLEDs 
     Luminous properties for each of the OLEDs fabricated in Examples 49-57 and Comparative Example 49 were measured using the same procedure as in Experimental Example 1. The measurement results are indicated in the following Table 7. 
     
       
         
           
               
             
               
                 TABLE 7 
               
             
            
               
                   
               
               
                 Luminous Properties of OLEDs 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
            
               
                 Sample 
                 EBL 
                 D 
                 H 
                 HBL 
                 V 
                 EQE (%) 
                 CIE(x) 
                 CIE(y) 
                 T 95  (hr) 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
               
            
               
                 Ref. 49 
                 Ref.  
                 1-1 
                 2-1 
                 Ref.  
                 4.00 
                 3.00 
                 0.140 
                 0.063 
                 22 
               
               
                 Ex. 49 
                 Ref.  
                 1-1 
                 2-7 
                 Ref.  
                 4.02 
                 2.97 
                 0.140 
                 0.062 
                 30 
               
               
                 Ex. 50 
                 Ref.  
                 1-1 
                 2-7 
                 E1 
                 4.01 
                 2.99 
                 0.140 
                 0.061 
                 38 
               
               
                 Ex. 51 
                 Ref.  
                 1-1 
                 2-7 
                 F1 
                 3.96 
                 3.04 
                 0.140 
                 0.060 
                 46 
               
               
                 Ex. 52 
                 H4 
                 1-1 
                 2-7 
                 Ref.  
                 4.01 
                 5.85 
                 0.139 
                 0.060 
                 87 
               
               
                 Ex. 53 
                 H4 
                 1-1 
                 2-7 
                 E1 
                 3.98 
                 5.99 
                 0.140 
                 0.060 
                 115 
               
               
                 Ex. 54 
                 H4 
                 1-1 
                 2-7 
                 F1 
                 3.98 
                 6.17 
                 0.140 
                 0.060 
                 133 
               
               
                 Ex. 55 
                 H3 
                 1-1 
                 2-7 
                 Ref.  
                 4.01 
                 6.20 
                 0.139 
                 0.62 
                 85 
               
               
                 Ex. 56 
                 H3 
                 1-1 
                 2-7 
                 E1 
                 4.00 
                 6.31 
                 0.141 
                 0.059 
                 114 
               
               
                 Ex. 57 
                 H3 
                 1-1 
                 2-7 
                 F1 
                 3.96 
                 6.48 
                 0.141 
                 0.060 
                 124 
               
               
                   
               
            
           
         
       
     
     Comparative Example 50 (Ref.50): Fabrication of OLED 
     An OLED where the EBL includes the Ref.EBL, the EML includes Compound 1-1 (dopant) in Formula 2 and Compound 2-3 (host) and the HBL includes the Ref.HBL was fabricated. 
     Examples 58-66 (Ex.58-66): Fabrication of OLEDs 
     An OLED where the EML includes the Compound 1-1 (dopant) in Formula 2 and Compound 2-9 (host) in Formula 4, the EBL includes the Ref.EBL (Ex.58-60), H4 in Formula 6 (Ex.61-63) or H3 in Formula 6 (Ex.64-66), respectively, and the HBL includes the Ref.HBL (Ex.58, 61 and 64), E1 in Formula 8 (Ex.59, 62 and 65) or F1 in Formula 10 (Ex.60, 63 and 66), respectively, were fabricated. 
     Experimental Example 8: Measurement of Luminous Properties of OLEDs 
     Luminous properties for each of the OLEDs fabricated in Examples 58-66 and Comparative Example 50 were measured using the same procedure as in Experimental Example 1. The measurement results are indicated in the following Table 8. 
     
       
         
           
               
             
               
                 TABLE 8 
               
             
            
               
                   
               
               
                 Luminous Properties of OLEDs 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
            
               
                 Sample 
                 EBL 
                 D 
                 H 
                 HBL 
                 V 
                 EQE (%) 
                 CIE(x) 
                 CIE(y) 
                 T 95  (hr) 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
               
            
               
                 Ref 50 
                 Ref.  
                 1-1 
                 2-3 
                 Ref.  
                 3.86 
                 2.92 
                 0.139 
                 0.064 
                 21 
               
               
                 Ex. 58 
                 Ref.  
                 1-1 
                 2-9 
                 Ref.  
                 3.87 
                 2.93 
                 0.140 
                 0.063 
                 28 
               
               
                 Ex. 59 
                 Ref.  
                 1-1 
                 2-9 
                 E1 
                 3.83 
                 2.98 
                 0.139 
                 0.062 
                 36 
               
               
                 Ex. 60 
                 Ref.  
                 1-1 
                 2-9 
                 F1 
                 3.90 
                 3.08 
                 0.141 
                 0.062 
                 39 
               
               
                 Ex. 61 
                 H4 
                 1-1 
                 2-9 
                 Ref.  
                 3.86 
                 5.81 
                 0.140 
                 0.063 
                 83 
               
               
                 Ex. 62 
                 H4 
                 1-1 
                 2-9 
                 E1 
                 3.81 
                 5.93 
                 0.139 
                 0.062 
                 102 
               
               
                 Ex. 63 
                 H4 
                 1-1 
                 2-9 
                 F1 
                 3.90 
                 6.11 
                 0.140 
                 0.063 
                 116 
               
               
                 Ex. 64 
                 H3 
                 1-1 
                 2-9 
                 Ref.  
                 3.89 
                 6.15 
                 0.139 
                 0.064 
                 79 
               
               
                 Ex. 65 
                 H3 
                 1-1 
                 2-9 
                 E1 
                 3.82 
                 6.22 
                 0.139 
                 0.062 
                 97 
               
               
                 Ex. 66 
                 H3 
                 1-1 
                 2-9 
                 F1 
                 3.89 
                 6.41 
                 0.140 
                 0.061 
                 115 
               
               
                   
               
            
           
         
       
     
     Comparative Example 51 (Ref.51): Fabrication of OLED 
     An OLED where the EBL includes the Ref.EBL, the EML includes Compound 1-4 (dopant) in Formula 2 and Compound 2-1 (host) and the HBL includes the Ref.HBL was fabricated. 
     Examples 67-75 (Ex.67-75): Fabrication of OLEDs 
     An OLED where the EML includes the Compound 1-4 (dopant) in Formula 2 and Compound 2-7 (host) in Formula 4, the EBL includes the Ref.EBL (Ex.67-69), H4 in Formula 6 (Ex.70-72) or H3 in Formula 6 (Ex.73-75), respectively, and the HBL includes the Ref.HBL (Ex.67, 70 and 73), E1 in Formula 8 (Ex.68, 71 and 74) or F1 in Formula 10 (Ex.69, 72 and 75), respectively, were fabricated. 
     Experimental Example 9: Measurement of Luminous Properties of OLEDs 
     Luminous properties for each of the OLEDs fabricated in Examples 67-75 and Comparative Example 51 were measured using the same procedure as in Experimental Example 1. The measurement results are indicated in the following Table 9. 
     
       
         
           
               
             
               
                 TABLE 9 
               
             
            
               
                   
               
               
                 Luminous Properties of OLEDs 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
            
               
                 Sample 
                 EBL 
                 D 
                 H 
                 HBL 
                 V 
                 EQE (%) 
                 CIE(x) 
                 CIE(y) 
                 T 95  (hr) 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
               
            
               
                 Ref. 51 
                 Ref.  
                 1-4 
                 2-1 
                 Ref.  
                 3.99 
                 2.95 
                 0.132 
                 0.062 
                 23 
               
               
                 Ex. 67 
                 Ref.  
                 1-4 
                 2-7 
                 Ref.  
                 4.00 
                 2.96 
                 0.131 
                 0.091 
                 34 
               
               
                 Ex. 68 
                 Ref.  
                 1-4 
                 2-7 
                 E1 
                 3.92 
                 3.01 
                 0.132 
                 0.090 
                 44 
               
               
                 Ex. 69 
                 Ref.  
                 1-4 
                 2-7 
                 F1 
                 3.92 
                 3.10 
                 0.130 
                 0.090 
                 49 
               
               
                 Ex. 70 
                 H4 
                 1-4 
                 2-7 
                 Ref.  
                 3.99 
                 5.88 
                 0.131 
                 0.090 
                 92 
               
               
                 Ex. 71 
                 H4 
                 1-4 
                 2-7 
                 E1 
                 3.95 
                 6.01 
                 0.131 
                 0.089 
                 123 
               
               
                 Ex. 72 
                 H4 
                 1-4 
                 2-7 
                 F1 
                 3.95 
                 6.19 
                 0.130 
                 0.090 
                 148 
               
               
                 Ex. 73 
                 H3 
                 1-4 
                 2-7 
                 Ref.  
                 3.95 
                 6.18 
                 0.131 
                 0.090 
                 88 
               
               
                 Ex. 74 
                 H3 
                 1-4 
                 2-7 
                 E1 
                 3.97 
                 6.31 
                 0.130 
                 0.090 
                 121 
               
               
                 Ex. 75 
                 H3 
                 1-4 
                 2-7 
                 F1 
                 3.92 
                 6.55 
                 0.130 
                 0.089 
                 138 
               
               
                   
               
            
           
         
       
     
     Comparative Example 52 (Ref.52): Fabrication of OLED 
     An OLED where the EBL includes the Ref.EBL, the EML includes Compound 1-4 (dopant) in Formula 2 and Compound 2-3 (host) and the HBL includes the Ref.HBL was fabricated. 
     Examples 76-84 (Ex.76-84): Fabrication of OLEDs 
     An OLED where the EML includes the Compound 1-4 (dopant) in Formula 2 and Compound 2-9 (host) in Formula 4, the EBL includes the Ref.EBL (Ex.76-78), H4 in Formula 6 (Ex.79-81) or H3 in Formula 6 (Ex.82-84), respectively, and the HBL includes the Ref.HBL (Ex.76, 79 and 82), E1 in Formula 8 (Ex.77, 80 and 83) or F1 in Formula 10 (Ex.78, 81 and 84), respectively, were fabricated. 
     Experimental Example 10: Measurement of Luminous Properties of OLEDs 
     Luminous properties for each of the OLEDs fabricated in Examples 76-84 and Comparative Example 52 were measured using the same procedure as in Experimental Example 1. The measurement results are indicated in the following Table 10. 
     
       
         
           
               
             
               
                 TABLE 10 
               
             
            
               
                   
               
               
                 Luminous Properties of OLEDs 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
            
               
                 Sample 
                 EBL 
                 D 
                 H 
                 HBL 
                 V 
                 EQE (%) 
                 CIE(x) 
                 CIE(y) 
                 T 95  (hr) 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
               
            
               
                 Ref. 52 
                 Ref.  
                 1-4 
                 2-3 
                 Ref.  
                 3.82 
                 2.89 
                 0.131 
                 0.092 
                 20 
               
               
                 Ex. 76 
                 Ref.  
                 1-4 
                 2-9 
                 Ref.  
                 3.87 
                 2.89 
                 0.131 
                 0.092 
                 29 
               
               
                 Ex. 77 
                 Ref.  
                 1-4 
                 2-9 
                 E1 
                 3.80 
                 2.97 
                 0.131 
                 0.091 
                 36 
               
               
                 Ex. 78 
                 Ref.  
                 1-4 
                 2-9 
                 F1 
                 3.87 
                 3.08 
                 0.132 
                 0.091 
                 44 
               
               
                 Ex. 79 
                 H4 
                 1-4 
                 2-9 
                 Ref.  
                 3.85 
                 5.77 
                 0.130 
                 0.092 
                 84 
               
               
                 Ex. 80 
                 H4 
                 1-4 
                 2-9 
                 E1 
                 3.80 
                 5.91 
                 0.131 
                 0.092 
                 109 
               
               
                 Ex. 81 
                 H4 
                 1-4 
                 2-9 
                 F1 
                 3.82 
                 6.09 
                 0.131 
                 0.091 
                 133 
               
               
                 Ex. 82 
                 H3 
                 1-4 
                 2-9 
                 Ref.  
                 3.85 
                 6.09 
                 0.131 
                 0.091 
                 83 
               
               
                 Ex. 83 
                 H3 
                 1-4 
                 2-9 
                 E1 
                 3.77 
                 6.23 
                 0.131 
                 0.092 
                 110 
               
               
                 Ex. 84 
                 H3 
                 1-4 
                 2-9 
                 F1 
                 3.85 
                 6.39 
                 0.130 
                 0.092 
                 131 
               
               
                   
               
            
           
         
       
     
     Comparative Example 53 (Ref.53): Fabrication of OLED 
     An OLED where the EBL includes the Ref.EBL, the EML includes Compound 1-6 (dopant) in Formula 2 and Compound 2-1 (host) and the HBL includes the Ref.HBL was fabricated. 
     Examples 85-93 (Ex.85-93): Fabrication of OLEDs 
     An OLED where the EML includes the Compound 1-6 (dopant) in Formula 2 and Compound 2-7 (host) in Formula 4, the EBL includes the Ref.EBL (Ex.85-87), H4 in Formula 6 (Ex.88-90) or H3 in Formula 6 (Ex.91-93), respectively, and the HBL includes the Ref.HBL (Ex.85, 88 and 91), E1 in Formula 8 (Ex.86, 89 and 92) or F1 in Formula 10 (Ex.87, 90 and 93), respectively, were fabricated. 
     Experimental Example 11: Measurement of Luminous Properties of OLEDs 
     Luminous properties for each of the OLEDs fabricated in Examples 85-93 and Comparative Example 53 were measured using the same procedure as in Experimental Example 1. The measurement results are indicated in the following Table 11. 
     
       
         
           
               
             
               
                 TABLE 11 
               
             
            
               
                   
               
               
                 Luminous Properties of OLEDs 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
            
               
                 Sample 
                 EBL 
                 D 
                 H 
                 HBL 
                 V 
                 EQE (%) 
                 CIE(x) 
                 CIE(y) 
                 T 95  (hr) 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
               
            
               
                 Ref. 53 
                 Ref.  
                 1-6 
                 2-1 
                 Ref.  
                 3.93 
                 3.11 
                 0.140 
                 0.076 
                 26 
               
               
                 Ex. 85 
                 Ref.  
                 1-6 
                 2-7 
                 Ref.  
                 3.95 
                 3.09 
                 0.140 
                 0.075 
                 45 
               
               
                 Ex. 86 
                 Ref.  
                 1-6 
                 2-7 
                 E1 
                 3.95 
                 3.14 
                 0.141 
                 0.074 
                 54 
               
               
                 Ex. 87 
                 Ref.  
                 1-6 
                 2-7 
                 F1 
                 3.91 
                 3.19 
                 0.140 
                 0.075 
                 61 
               
               
                 Ex. 88 
                 H4 
                 1-6 
                 2-7 
                 Ref.  
                 3.96 
                 6.13 
                 0.140 
                 0.076 
                 122 
               
               
                 Ex. 89 
                 H4 
                 1-6 
                 2-7 
                 E1 
                 3.91 
                 6.27 
                 0.140 
                 0.074 
                 161 
               
               
                 Ex. 90 
                 H4 
                 1-6 
                 2-7 
                 F1 
                 3.91 
                 6.38 
                 0.140 
                 0.074 
                 190 
               
               
                 Ex. 91 
                 H3 
                 1-6 
                 2-7 
                 Ref.  
                 3.93 
                 6.45 
                 0.139 
                 0.077 
                 110 
               
               
                 Ex. 92 
                 H3 
                 1-6 
                 2-7 
                 E1 
                 3.92 
                 6.58 
                 0.140 
                 0.074 
                 150 
               
               
                 Ex. 93 
                 H3 
                 1-6 
                 2-7 
                 F1 
                 3.92 
                 6.70 
                 0.140 
                 0.074 
                 177 
               
               
                   
               
            
           
         
       
     
     Comparative Example 54 (Ref.54): Fabrication of OLED 
     An OLED where the EBL includes the Ref.EBL, the EML includes Compound 1-6 (dopant) in Formula 2 and Compound 2-3 (host) and the HBL includes the Ref.HBL was fabricated. 
     Examples: 94-102 (Ex.94-102): Fabrication of OLEDs 
     An OLED where the EML includes the Compound 1-6 (dopant) in Formula 2 and Compound 2-9 (host) in Formula 4, the EBL includes the Ref.EBL (Ex.94-96), H4 in Formula 6 (Ex.97-99) or H3 in Formula 6 (Ex.100-102), respectively, and the HBL includes the Ref.HBL (Ex.94, 97 and 100), E1 in Formula 8 (Ex.95, 98 and 101) or F1 in Formula 10 (Ex.96, 99 and 102), respectively, were fabricated. 
     Experimental Example 12: Measurement of Luminous Properties of OLEDs 
     Luminous properties for each of the OLEDs fabricated in Examples 94-102 and Comparative Example 54 were measured using the same procedure as in Experimental Example 1. The measurement results are indicated in the following Table 12. 
     
       
         
           
               
             
               
                 TABLE 12 
               
             
            
               
                   
               
               
                 Luminous Properties of OLEDs 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
            
               
                 Sample 
                 EBL 
                 D 
                 H 
                 HBL 
                 V 
                 EQE (%) 
                 CIE(x) 
                 CIE(y) 
                 T 95  (hr) 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
               
            
               
                 Ref. 54 
                 Ref.  
                 1-6 
                 2-3 
                 Ref.  
                 3.82 
                 3.01 
                 0.139 
                 0.076 
                 28 
               
               
                 Ex. 94 
                 Ref.  
                 1-6 
                 2-9 
                 Ref.  
                 3.84 
                 3.03 
                 0.138 
                 0.081 
                 38 
               
               
                 Ex. 95 
                 Ref.  
                 1-6 
                 2-9 
                 E1 
                 3.81 
                 3.09 
                 0.137 
                 0.080 
                 49 
               
               
                 Ex. 96 
                 Ref.  
                 1-6 
                 2-9 
                 F1 
                 3.82 
                 3.19 
                 0.138 
                 0.081 
                 58 
               
               
                 Ex. 97 
                 H4 
                 1-6 
                 2-9 
                 Ref.  
                 3.85 
                 6.05 
                 0.138 
                 0.081 
                 112 
               
               
                 Ex. 98 
                 H4 
                 1-6 
                 2-9 
                 E1 
                 3.79 
                 6.13 
                 0.137 
                 0.081 
                 145 
               
               
                 Ex. 99 
                 H4 
                 1-6 
                 2-9 
                 F1 
                 3.80 
                 6.31 
                 0.137 
                 0.082 
                 174 
               
               
                 Ex. 100 
                 H3 
                 1-6 
                 2-9 
                 Ref.  
                 3.83 
                 6.36 
                 0.138 
                 0.081 
                 106 
               
               
                 Ex. 101 
                 H3 
                 1-6 
                 2-9 
                 E1 
                 3.79 
                 6.41 
                 0.138 
                 0.079 
                 136 
               
               
                 Ex. 102 
                 H3 
                 1-6 
                 2-9 
                 F1 
                 3.80 
                 6.60 
                 0.137 
                 0.082 
                 169 
               
               
                   
               
            
           
         
       
     
     Comparative Example 55(Ref.55): Fabrication of OLED 
     An OLED where the EBL includes the Ref.EBL, the EML includes Compound 1-8 (dopant) in Formula 2 and Compound 2-1 (host) and the HBL includes the Ref.HBL was fabricated. 
     Examples: 103-111 (Ex.103-111): Fabrication of OLEDs 
     An OLED where the EML includes the Compound 1-8 (dopant) in Formula 2 and Compound 2-7 (host) in Formula 4, the EBL includes the Ref.EBL (Ex.103-105), H4 in Formula 6 (Ex.106-108) or H3 in Formula 6 (Ex.109-111), respectively, and the HBL includes the Ref.HBL (Ex.103, 106 and 109), E1 in Formula 8 (Ex.104, 107 and 110) or F1 in Formula 10 (Ex.105, 108 and 111), respectively, were fabricated. 
     Experimental Example 13: Measurement of Luminous Properties of OLEDs 
     Luminous properties for each of the OLEDs fabricated in Examples 103-111 and Comparative Example 55 were measured using the same procedure as in Experimental Example 1. The measurement results are indicated in the following Table 13. 
     
       
         
           
               
             
               
                 TABLE 13 
               
             
            
               
                   
               
               
                 Luminous Properties of OLEDs 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
            
               
                 Sample 
                 EBL 
                 D 
                 H 
                 HBL 
                 V 
                 EQE (%) 
                 CIE(x) 
                 CIE(y) 
                 T 95  (hr) 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
               
            
               
                 Ref. 55 
                 Ref.  
                 1-8 
                 2-1 
                 Ref.  
                 3.92 
                 3.12 
                 0.136 
                 0.081 
                 28 
               
               
                 Ex. 103 
                 Ref.  
                 1-8 
                 2-7 
                 Ref.  
                 3.93 
                 3.08 
                 0.139 
                 0.082 
                 42 
               
               
                 Ex. 104 
                 Ref.  
                 1-8 
                 2-7 
                 E1 
                 3.87 
                 3.17 
                 0.137 
                 0.081 
                 50 
               
               
                 Ex. 105 
                 Ref.  
                 1-8 
                 2-7 
                 F1 
                 3.91 
                 3.22 
                 0.137 
                 0.082 
                 59 
               
               
                 Ex. 106 
                 H4 
                 1-8 
                 2-7 
                 Ref.  
                 3.92 
                 6.17 
                 0.138 
                 0.081 
                 119 
               
               
                 Ex. 107 
                 H4 
                 1-8 
                 2-7 
                 E1 
                 3.88 
                 6.29 
                 0.137 
                 0.080 
                 149 
               
               
                 Ex. 108 
                 H4 
                 1-8 
                 2-7 
                 F1 
                 3.89 
                 6.44 
                 0.137 
                 0.081 
                 175 
               
               
                 Ex. 109 
                 H3 
                 1-8 
                 2-7 
                 Ref.  
                 3.90 
                 6.48 
                 0.138 
                 0.081 
                 118 
               
               
                 Ex. 110 
                 H3 
                 1-8 
                 2-7 
                 E1 
                 3.88 
                 6.67 
                 0.138 
                 0.081 
                 142 
               
               
                 Ex. 111 
                 H3 
                 1-8 
                 2-7 
                 F1 
                 3.89 
                 6.72 
                 0.136 
                 0.082 
                 167 
               
               
                   
               
            
           
         
       
     
     Comparative Example 56 (Ref.56): Fabrication of OLED 
     An OLED where the EBL includes the Ref.EBL, the EML includes Compound 1-8 (dopant) in Formula 2 and Compound 2-3 (host) and the HBL includes the Ref.HBL was fabricated. 
     Examples: 112-120 (Ex.112-120): Fabrication of OLEDs 
     An OLED where the EML includes the Compound 1-8 (dopant) in Formula 2 and Compound 2-9 (host) in Formula 4, the EBL includes the Ref.EBL (Ex.112-114), H4 in Formula 6 (Ex.115-117) or H3 in Formula 6 (Ex.118-120), respectively, and the HBL includes the Ref.HBL (Ex.112, 115 and 118), E1 in Formula 8 (Ex.113, 116 and 119) or F1 in Formula 10 (Ex.114, 117 and 120), respectively, were fabricated. 
     Experimental Example 14: Measurement of Luminous Properties of OLEDs 
     Luminous properties for each of the OLEDs fabricated in Examples 112-120 and Comparative Example 56 were measured using the same procedure as in Experimental Example 1. The measurement results are indicated in the following Table 14. 
     
       
         
           
               
             
               
                 TABLE 14 
               
             
            
               
                   
               
               
                 Luminous Properties of OLEDs 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
            
               
                 Sample 
                 EBL 
                 D 
                 H 
                 HBL 
                 V 
                 EQE (%) 
                 CIE(x) 
                 CIE(y) 
                 T 95  (hr) 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
               
            
               
                 Ref. 56 
                 Ref.  
                 1-8 
                 2-3 
                 Ref.  
                 3.80 
                 3.05 
                 0.137 
                 0.081 
                 27 
               
               
                 Ex. 112 
                 Ref.  
                 1-8 
                 2-9 
                 Ref.  
                 3.81 
                 3.07 
                 0.138 
                 0.083 
                 36 
               
               
                 Ex. 113 
                 Ref.  
                 1-8 
                 2-9 
                 E1 
                 3.76 
                 3.06 
                 0.137 
                 0.083 
                 42 
               
               
                 Ex. 114 
                 Ref.  
                 1-8 
                 2-9 
                 F1 
                 3.80 
                 3.18 
                 0.137 
                 0.083 
                 52 
               
               
                 Ex. 115 
                 H4 
                 1-8 
                 2-9 
                 Ref.  
                 3.82 
                 6.05 
                 0.137 
                 0.083 
                 107 
               
               
                 Ex. 116 
                 H4 
                 1-8 
                 2-9 
                 E1 
                 3.78 
                 6.12 
                 0.136 
                 0.084 
                 132 
               
               
                 Ex. 117 
                 H4 
                 1-8 
                 2-9 
                 F1 
                 3.79 
                 6.30 
                 0.136 
                 0.084 
                 156 
               
               
                 Ex. 118 
                 H3 
                 1-8 
                 2-9 
                 Ref.  
                 3.84 
                 6.38 
                 0.137 
                 0.083 
                 102 
               
               
                 Ex. 119 
                 H3 
                 1-8 
                 2-9 
                 E1 
                 3.76 
                 6.42 
                 0.136 
                 0.084 
                 129 
               
               
                 Ex. 120 
                 H3 
                 1-8 
                 2-9 
                 F1 
                 3.81 
                 6.62 
                 0.136 
                 0.083 
                 144 
               
               
                   
               
            
           
         
       
     
     Summarizing the results in Tables 7 to 14, compared to the OLEDs fabricated in Ref.49 to Ref.56 where the EML includes a non-deuterated anthracene-based compound (Compound 2-1 or Compound 2-3) as the host, the OLEDs fabricated in Ex.49 to Ex.120 where the EML includes a deuterated anthracene-based compound (Compound 2-7 or Compound 2-9) as the host improved luminous efficiency and luminous lifespan. 
     In addition, compared to the OLEDs fabricated in Ex.58-66, 76-84, 94-102 and 112-120 where the EML includes the Compound 2-9 as the host, the OLEDs fabricated in Ex.49-57, 67-75, 85-93 and 103-111 where the EML includes the Compound 2-7 as the host improved their luminous efficiency and luminous lifespan. In other words, when the anthracene-based compound, where a naphthyl moiety (1-naphthyl) is linked directly to one side of an anthracene moiety and other naphthyl moiety (2-naphthyl) is linked directly or via a bridging group (linker) to the other side of the anthracene moiety and is deuterated, are used as the host in the EML, the luminous efficiency and the luminous lifespan of the OLEDs are further increased. 
     Also, when the boron-based compound (Compound 1-6 or Compound 1-8) having an asymmetric chemical structure was used as the dopant in the EML, the luminous efficiency and the luminous lifespan of the OLEDs are further improved. Particularly, when the Compound 1-6 (R 91  is alkyl (tert-butyl), each of R 81  and R 82  is aryl (phenyl) substituted with alkyl (tert-butyl) in Formula 1B), is used as the dopant in the EML, the luminous efficiency and the luminous lifespan of the OLEDs are improved significantly. 
     Moreover, when the HBL includes the azine-based compound of Formula 8 or the benzimidazole-based compound of Formula 10, the OLEDs showed very excellent luminous efficiency and luminous lifespan. Also, when the HBL includes the amine-based compound of Formula 6, the luminous efficiency and the luminous lifespan of the OLED can be maximized. 
     In addition, when the EML includes the deuterated anthracene-based compound (Compound 2-7 or Compound 2-9) and the boron-based compound of Formula 1B, the EBL includes the amine-based compound of Formula 5 and the HBL includes the azine-based compound of Formula 7 or the benzimidazole-based compound of Formula 9, the luminous efficiency and the luminous lifespan of the OLED are remarkably improved. 
     It will be apparent to those skilled in the art that various modifications and variations can be made in the organic light emitting device of the present disclosure without departing from the scope of the disclosure. Thus, it is intended that the present disclosure cover the modifications and variations of the present disclosure provided they come within the scope of the appended claims.