Patent Publication Number: US-2022213127-A1

Title: Emitting compound and organic light emitting device including the same

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     The present application claims the benefit of Korean Patent Application No. 10-2020-0186022 filed on Dec. 29, 2020, which is hereby incorporated by reference in its entirety. 
     BACKGROUND 
     Field of the Disclosure 
     The present disclosure relates to an emitting compound, and more specifically, to an emitting compound having high emitting efficiency and lifespan and an organic light emitting device including the same. 
     Description of the Background 
     As requests for a flat panel display device having a small occupied area have been increased, an organic light emitting display device including an organic light emitting diode (OLED) has been the subject of recent research and development. 
     The OLED emits light by injecting electrons from a cathode as an electron injection electrode and holes from an anode as a hole injection electrode into an emitting material layer (EML), combining the electrons with the holes, generating an exciton, and transforming the exciton from an excited state to a ground state. A flexible substrate, for example, a plastic substrate, can be used as a base substrate where elements are formed. In addition, the organic light emitting display device can be operated at a voltage (e.g., 10V or below) lower than a voltage required to operate other display devices. Moreover, the organic light emitting display device has advantages in the power consumption and the color sense. 
     For example, the organic light emitting display device may include a red pixel region, a green pixel region and a blue pixel region, and the OLED may be formed in each of the red, green and blue pixel regions. 
     However, the OLED in the blue pixel does not provide sufficient emitting efficiency and lifespan such that the organic light emitting display device has a limitation in the emitting efficiency and the lifespan. 
     SUMMARY 
     The present disclosure is directed to an emitting compound and an organic light emitting device including the emitting compound that substantially obviate one or more of the problems associated with the limitations and disadvantages of the related conventional art. 
     Additional features and advantages of the present disclosure are set forth in the description which follows, and will be apparent from the description, or evident by practice of the present disclosure. The features and other advantages of the present disclosure are realized and attained by the features described herein as well as in the appended drawings. 
     To achieve these and other advantages in accordance with the purpose of the aspects of the present disclosure, as described herein, an aspect of the present disclosure is an emitting compound represented by Formula 1: 
     
       
         
         
             
             
         
       
     
     wherein n is 0 or 1, and X is one of B, P═O and P═S, wherein each of Y 1  and Y 2  is independently selected from the group consisting of NR 1 , C(R 2 ) 2 , O, S, Se and Si(R 3 ) 2 , and Y 3  is O or S, wherein each of Z 1  to Z 4  is independently N or CR 4 , and at least three of Z 1  to Z 4  are CR 4 , wherein each of R 1  to R 3  is independently selected from the group consisting of hydrogen, deuterium, C1 to C10 alkyl group unsubstituted or substituted with deuterium, C6 to C30 arylamine group unsubstituted or substituted with deuterium or C1 to C10 alkyl, C6 to C30 aryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl, and C5 to C30 heteroaryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl, wherein each of R 4  to R 6  is independently selected from the group consisting of hydrogen, deuterium, C1 to C10 alkyl group unsubstituted or substituted with deuterium, C6 to C30 arylamine group unsubstituted or substituted with deuterium or C1 to C10 alkyl, C6 to C30 aryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl, and C5 to C30 heteroaryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl, or adjacent two of R 4  to R 6  are connected to each other to form a fused ring, and at least one of R 4  to R 6  is C1 to C10 alkyl substituted with deuterium, and wherein each of A and B rings is independently selected from the group consisting of substituted or unsubstituted six-membered cycloalkyl ring, substituted or unsubstituted six-membered aromatic ring and substituted or unsubstituted six-membered heteroaromatic ring. 
     Another aspect of the present disclosure is an organic light emitting device comprising a substrate; and an organic light emitting diode positioned on the substrate and including a first electrode; a second electrode facing the first electrode; and a first emitting material layer including a first compound and positioned between the first and second electrodes, wherein the first compound is the above emitting compound. 
     It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to further explain the present disclosure as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate aspects of the present disclosure and together with the description serve to explain the principles of the present disclosure. 
         FIG. 1  is a schematic circuit diagram illustrating an organic light emitting display device of the present disclosure; 
         FIG. 2  is a schematic cross-sectional view illustrating an organic light emitting display device according to a first aspect of the present disclosure; 
         FIG. 3  is a schematic cross-sectional view illustrating an OLED having a single emitting part for the organic light emitting display device according to the first aspect of the present disclosure; 
         FIG. 4  is a schematic cross-sectional view illustrating an OLED having a tandem structure of two emitting parts for the organic light emitting display device according to the first aspect of the present disclosure; 
         FIG. 5  is a schematic cross-sectional view illustrating an organic light emitting display device according to a second aspect of the present disclosure; 
         FIG. 6  is a schematic cross-sectional view illustrating an OLED having a tandem structure of two emitting parts for the organic light emitting display device according to the second aspect of the present disclosure; 
         FIG. 7  is a schematic cross-sectional view illustrating an OLED having a tandem structure of three emitting parts for the organic light emitting display device according to the second aspect of the present disclosure; and 
         FIG. 8  is a schematic cross-sectional view illustrating an organic light emitting display device according to a third aspect of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in detail to some of the examples and aspects, which are illustrated in the accompanying drawings. 
       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 and a data line DL, which cross each other to define a pixel (pixel region) P, and a power line PL are formed in an organic light emitting display device. A switching thin film transistor (TFT) Ts, a driving TFT Td, a storage capacitor Cst and an OLED D are formed in the pixel region P. The pixel region P may include a red pixel, a green pixel and a blue pixel. 
     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 OLED D is connected to the driving thin film transistor Td. When the switching thin film transistor Ts is turned on by the gate signal applied through the gate line GL, the data signal applied through the data line DL is applied 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 OLED D through the driving thin film transistor Td. The OLED 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 according to a first aspect of the present disclosure. 
     As illustrated in  FIG. 2 , the organic light emitting display device  100  includes a substrate  110 , a TFT Tr and an OLED D connected to the TFT Tr. For example, the organic light emitting display device  100  may include a red pixel, a green pixel and a blue pixel, and the OLED D may be formed in each of the red, green and blue pixels. Namely, the OLEDs D emitting red light, green light and blue light may be provided in the red, green and blue pixels, respectively. 
     The substrate  110  may be a glass substrate or a flexible substrate. For example, the flexible substrate may be a polyimide (PI) substrate, a polyethersulfone (PES) substrate, a polyethylenenaphthalate (PEN) substrate, a polyethylene terephthalate (PET) substrate or a polycarbonate (PC) substrate. 
     A buffer layer  120  is formed on the substrate, and the TFT Tr is formed on the buffer layer  120 . The buffer layer  120  may be omitted. 
     A semiconductor layer  122  is formed on the buffer layer  120 . The semiconductor layer  122  may include an oxide semiconductor material or polycrystalline silicon. 
     When the semiconductor layer  122  includes the oxide semiconductor material, a light-shielding pattern (not shown) may be formed under the semiconductor layer  122 . The light to the semiconductor layer  122  is shielded or blocked by the light-shielding pattern such that thermal degradation of the semiconductor layer  122  can be prevented. On the other hand, when the semiconductor layer  122  includes polycrystalline silicon, impurities may be doped into both sides of the semiconductor layer  122 . 
     A gate insulating layer  124  is formed on the semiconductor layer  122 . The gate insulating layer  124  may be formed of an inorganic insulating material such as silicon oxide or silicon nitride. 
     A gate electrode  130 , which is formed of a conductive material, e.g., metal, is formed on the gate insulating layer  124  to correspond to a center of the semiconductor layer  122 . 
     In  FIG. 2 , the gate insulating layer  124  is formed on an entire surface of the substrate  110 . Alternatively, the gate insulating layer  124  may be patterned to have the same shape as the gate electrode  130 . 
     An interlayer insulating layer  132 , which is formed of an insulating material, is formed on the gate electrode  130 . The interlayer insulating layer  132  may be formed of an inorganic insulating material, e.g., silicon oxide or silicon nitride, or an organic insulating material, e.g., benzocyclobutene or photo-acryl. 
     The interlayer insulating layer  132  includes first and second contact holes  134  and  136  exposing both sides of the semiconductor layer  122 . The first and second contact holes  134  and  136  are positioned at both sides of the gate electrode  130  to be spaced apart from the gate electrode  130 . 
     The first and second contact holes  134  and  136  are formed through the gate insulating layer  124 . Alternatively, when the gate insulating layer  124  is patterned to have the same shape as the gate electrode  130 , the first and second contact holes  134  and  136  is formed only through the interlayer insulating layer  132 . 
     A source electrode  140  and a drain electrode  142 , which are formed of a conductive material, e.g., metal, are formed on the interlayer insulating layer  132 . 
     The source electrode  140  and the drain electrode  142  are spaced apart from each other with respect to the gate electrode  130  and respectively contact both sides of the semiconductor layer  122  through the first and second contact holes  134  and  136 . 
     The semiconductor layer  122 , the gate electrode  130 , the source electrode  140  and the drain electrode  142  constitute the TFT Tr. The TFT Tr serves as a driving element. Namely, the TFT Tr may correspond to the driving TFT Td (of  FIG. 1 ). 
     In the TFT Tr, the gate electrode  130 , the source electrode  140 , and the drain electrode  142  are positioned over the semiconductor layer  122 . Namely, the TFT Tr has a coplanar structure. 
     Alternatively, in the TFT Tr, the gate electrode may be positioned under the semiconductor layer, and the source and drain electrodes may be positioned over the semiconductor layer such that the TFT Tr may have an inverted staggered structure. In this instance, the semiconductor layer may include amorphous silicon. 
     Although not shown, the gate line and the data line cross each other to define the pixel, and the switching TFT is formed to be connected to the gate and data lines. The switching TFT is connected to the TFT Tr as the driving element. 
     In addition, the power line, which may be formed to be parallel to and spaced apart from one of the gate and data lines, and the storage capacitor for maintaining the voltage of the gate electrode of the TFT Tr in one frame may be further formed. 
     A passivation layer  150 , which includes a drain contact hole  152  exposing the drain electrode  142  of the TFT Tr, is formed to cover the TFT Tr. 
     A first electrode  160 , which is connected to the drain electrode  142  of the TFT Tr through the drain contact hole  152 , is separately formed in each pixel and on the passivation layer  150 . The first electrode  160  may be an anode and may be formed of a conductive material, e.g., a transparent conductive oxide (TCO), having a relatively high work function. For example, the first electrode  160  may be formed of indium-tin-oxide (ITO), indium-zinc-oxide (IZO), indium-tin-zinc-oxide (ITZO), tin oxide (SnO), zinc oxide (ZnO), indium-copper-oxide (ICO) or aluminum-zinc-oxide (Al:ZnO, AZO). 
     When the organic light emitting display device  100  is operated in a bottom-emission type, the first electrode  160  may have a single-layered structure of the transparent conductive material layer. When the Organic light emitting display device  100  is operated in a top-emission type, a reflection electrode or a reflection layer may be formed under the first electrode  160 . For example, the reflection electrode or the reflection layer may be formed of silver (Ag) or aluminum-palladium-copper (APC) alloy. In this instance, the first electrode  160  may have a triple-layered structure of ITO/Ag/ITO or ITO/APC/ITO. 
     A bank layer  166  is formed on the passivation layer  150  to cover an edge of the first electrode  160 . Namely, the bank layer  166  is positioned at a boundary of the pixel and exposes a center of the first electrode  160  in the pixel. 
     An organic emitting layer  162  is formed on the first electrode  160 . The organic emitting layer  162  may have a single-layered structure of an emitting material layer including an emitting material. To increase an emitting efficiency of the OLED D and/or the organic light emitting display device  100 , the organic emitting layer  162  may have a multi-layered structure. 
     The organic emitting layer  162  is separated in each of the red, green and blue pixels. As illustrated below, the organic emitting layer  162  in the blue pixel includes an emitting compound of Formula 1 such that the emitting efficiency and the lifespan of the OLED D in the blue pixel are improved. 
     A second electrode  164  is formed over the substrate  110  where the organic emitting layer  162  is formed. The second electrode  164  covers an entire surface of the display area and may be formed of a conductive material having a relatively low work function to serve as a cathode. For example, the second electrode  164  may be formed of aluminum (Al), magnesium (Mg), calcium (Ca), silver (Ag) or their alloy or combination. In the top-emission type organic light emitting display device  100 , the second electrode  164  may have a thin profile (small thickness) to provide a light transmittance property (or a semi-transmittance property). 
     The first electrode  160 , the organic emitting layer  162  and the second electrode  164  constitute the OLED D. 
     An encapsulation film  170  is formed on the second electrode  164  to prevent penetration of moisture into the OLED D. The encapsulation film  170  includes a first inorganic insulating layer  172 , an organic insulating layer  174  and a second inorganic insulating layer  176  sequentially stacked, but it is not limited thereto. The encapsulation film  170  may be omitted. 
     The Organic light emitting display device  100  may further include a polarization plate (not shown) for reducing an ambient light reflection. For example, the polarization plate may be a circular polarization plate. In the bottom-emission type organic light emitting display device  100 , the polarization plate may be disposed under the substrate  110 . In the top-emission type organic light emitting display device  100 , the polarization plate may be disposed on or over the encapsulation film  170 . 
     In addition, in the top-emission type organic light emitting display device  100 , a cover window (not shown) may be attached to the encapsulation film  170  or the polarization plate. In this instance, the substrate  110  and the cover window have a flexible property such that a flexible organic light emitting display device may be provided. 
       FIG. 3  is a schematic cross-sectional view illustrating an OLED having a single emitting unit for the organic light emitting display device according to the first aspect of the present disclosure. 
     As illustrated in  FIG. 3 , the OLED D includes the first and second electrodes  160  and  164 , which face each other, and the organic emitting layer  162  therebetween. The organic emitting layer  162  includes an emitting material layer (EML)  240  between the first and second electrodes  160  and  164 . The organic light emitting display device  100  (of  FIG. 2 ) may include a red pixel, a green pixel and a blue pixel, and the OLED D may be positioned in the blue pixel. 
     One of the first and second electrodes  160  and  164  is an anode, and the other one of the first and second electrodes  160  and  164  is cathode. In addition, one of the first and second electrodes  160  and  164  may be a transparent (or a semi-transparent) electrode, and the other one of the first and second electrodes  160  and  164  may be a reflection electrode. 
     The organic emitting layer  162  may further include an electron blocking layer (EBL)  230  between the first electrode  160  and the EML  240  and a hole blocking layer (HBL)  250  between the EML  240  and the second electrode  164 . 
     In addition, the organic emitting layer  162  may further include a hole transporting layer (HTL)  220  between the first electrode  160  and the EBL  230 . 
     Moreover, the organic emitting layer  162  may further include a hole injection layer (HIL)  210  between the first electrode  160  and the HTL  220  and an electron injection layer (EIL)  260  between the second electrode  164  and the HBL  250 . 
     The EML  240  includes an emitting compound  242  as a first compound. The emitting compound is a polycyclic aromatic compound and is represented by Formula 1. 
     
       
         
         
             
             
         
       
     
     In Formula 1, n is 0 or 1, and X is one of B, P═O and P═S. Each of Y 1  and Y 2  is independently selected from the group consisting of NR 1 , C(R 2 ) 2 , O, S, Se and Si(R 3 ) 2 , and Y 3  is O or S. Each of Z 1  to Z 4  is independently N or CR 4 , and at least three of Z 1  to Z 4  are CR 4 . Each of R 1  to R 3  is independently selected from the group consisting of hydrogen, deuterium (D), C1 to C10 alkyl group unsubstituted or substituted with deuterium, C6 to C30 arylamine group unsubstituted or substituted with deuterium or C1 to C10 alkyl, C6 to C30 aryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl, and C5 to C30 heteroaryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl. In addition, each of R 4  to R 6  is independently selected from the group consisting of hydrogen, deuterium, C1 to C10 alkyl group unsubstituted or substituted with deuterium, C6 to C30 arylamine group unsubstituted or substituted with deuterium or C1 to C10 alkyl, C6 to C30 aryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl, and C5 to C30 heteroaryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl, or adjacent two of R 4  to R 6  are connected (combined) to each other to form a fused ring. At least one of R 4  to R 6  is C1 to C10 alkyl substituted with deuterium. 
     Each of A and B rings is independently selected from the group consisting of substituted or unsubstituted six-membered cycloalkyl ring, substituted or unsubstituted six-membered aromatic ring and substituted or unsubstituted six-membered heteroaromatic ring. 
     The fused ring may be C6 to C30 aromatic ring or C5 to C30 heteroaromatic (fused) ring. For example, the fused ring of C6 to C30 aromatic ring may be benzene ring or naphthalene ring. 
     In each of the A and B rings, hydrogen may be substituted by at least one of D, C1 to C10 alkyl group unsubstituted or substituted with deuterium, C6 to C30 aryl group and C5 to C30 heteroaryl group. 
     For example, in Formula 1, n may be 0. Namely, the five-membered ring including Y 3  may be directly connected to X and Y 2 , and the emitting compound in Formula 1 may be represented by Formula 2-1. 
     
       
         
         
             
             
         
       
     
     In addition, in Formula 2-1, X may be B, each of Y 1  and Y 2  may be NR 1 , and each of the A and B rings may be a benzene ring. Namely, the emitting compound in Formula 1 may be represented by Formula 2-2. 
     
       
         
         
             
             
         
       
     
     In Formula 2-2, one of Z 1  to Z 4  is N, and three of Z 1  to Z 4  are CR 4 . At least one of three R 4  is D-substituted C1 to C10 alkyl group. Each of R 11  to R 17  is independently selected from the group consisting of hydrogen, deuterium (D), C1 to C10 alkyl group unsubstituted or substituted with deuterium, C6 to C30 arylamine group unsubstituted or substituted with deuterium or C1 to C10 alkyl, C6 to C30 aryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl, and C5 to C30 heteroaryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl. 
     For example, in Formula 2-2, R 1  may be C6 to C30 aryl, e.g., phenyl. One of three R 4  may be D-substituted C1 to C10 alkyl, e.g., CD3, and the other two of three R 4  may be hydrogen. In addition, R 11  to R 17  may be hydrogen. The compound of Formula 2-1 or Formula 2-2 may be one of the compounds 1-1 to 1-10 in Formula 6. 
     Alternatively, in Formula 1, n may be O, and Z 1  to Z 4  may be CR 4 . Namely, the emitting compound in Formula 1 may be represented by Formula 3-1. 
     
       
         
         
             
             
         
       
     
     In addition, in Formula 3-1, X may be B, each of Y 1  and Y 2  may be NR 1 , and each of the A and B rings may be a benzene ring. Namely, the emitting compound in Formula 1 may be represented by Formula 3-2. 
     
       
         
         
             
             
         
       
     
     In Formula 3-2, adjacent two of R 4  are connected to each other to form a fused ring, and at least one of the other two R 4  is D-substituted C1 to C10 alkyl. In addition, each of R 21  to R 27  is independently selected from the group consisting of hydrogen, D, C1 to C10 alkyl group unsubstituted or substituted with deuterium, C6 to C30 arylamine group unsubstituted or substituted with deuterium or C1 to C10 alkyl, C6 to C30 aryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl, and C5 to C30 heteroaryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl. 
     For example, in Formula 3-2, R 1  may be C6 to C30 aryl, e.g., phenyl. One of the other two R 4  may be CD 3 , and the other one of the other two R 4  may be hydrogen. In addition, the fused ring formed by adjacent two of R 4  may be C6 to C30 aromatic ring, e.g., benzene ring, and R 21  to R 27  may be hydrogen. The compound of Formula 3-1 or Formula 3-2 may be one of the compounds 2-1 to 2-6 in Formula 6. 
     Alternatively, in Formula 1, n may be 1. Namely, the emitting compound in Formula 1 may be represented by Formula 4-1. 
     
       
         
         
             
             
         
       
     
     In addition, in Formula 4-1, X may be B, each of Y 1  and Y 2  may be NR 1 , and each of the A and B rings may be a benzene ring. In this instance, depending on a combing position of the five-membered ring including Y 3 , the emitting compound in Formula 4-1 may be represented by one of Formulas 4-2 to 4-4. 
     
       
         
         
             
             
         
       
     
     In Formulas 4-2 to 4-4, one of Z 1  to Z 4  is N, and three of Z 1  to Z 4  are CR 4 . At least one of three R 4  is D-substituted C1 to C10 alkyl group. Each of R 31  to R 37  is independently selected from the group consisting of hydrogen, deuterium (D), C1 to C10 alkyl group unsubstituted or substituted with deuterium, C6 to C30 arylamine group unsubstituted or substituted with deuterium or C1 to C10 alkyl, C6 to C30 aryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl, and C5 to C30 heteroaryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl. 
     For example, in Formulas 4-2 to 4-4, R 1  may be C6 to C30 aryl, e.g., phenyl. One of three R 4  may be D-substituted C1 to C10 alkyl, e.g., CD3, and the other two of three R 4  may be hydrogen. In addition, R 31  to R 37  may be hydrogen. The compound of Formulas 4-1 to Formula 4-4 may be one of the compounds 3-1 to 3-9 in Formula 6. 
     Alternatively, in each of Formulas 4-2 to 4-4, adjacent two of R 31  to R 34  may be connected to each other to form a hetero-fused ring. Namely, the emitting compound of the present disclosure may be represented by one of Formulas 4-5 to 4-7. 
     
       
         
         
             
             
         
       
     
     In each of Formulas 4-5 to 4-7, Y 4  is O or S. One of Z 5  to Z 8  is N, and the other three of Z 5  to Z 8  are CR 7 . Each of three R 7  is independently selected from the group consisting of hydrogen, deuterium, C1 to C10 alkyl group unsubstituted or substituted with deuterium, C6 to C30 arylamine group unsubstituted or substituted with deuterium or C1 to C10 alkyl, C6 to C30 aryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl, and C5 to C30 heteroaryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl, and at least one of three R 7  is D-substituted C1 to C10 alkyl group. 
     Each of R 35  to R 37  is independently selected from the group consisting of hydrogen, deuterium (D), C1 to C10 alkyl group unsubstituted or substituted with deuterium, C6 to C30 arylamine group unsubstituted or substituted with deuterium or C1 to C10 alkyl, C6 to C30 aryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl, and C5 to C30 heteroaryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl. 
     For example, in each of Formulas 4-5 to 4-7, R 1  may be C6 to C30 aryl, e.g., phenyl. One of three R 7  may be D-substituted C1 to C10 alkyl, e.g., CD3, and the other two of three R 7  may be hydrogen. In addition, R 35  to R 37  may be hydrogen. 
     Alternatively, in Formula 1, n may be 1, and Z 1  to Z 4  are CR 4 . Namely, the emitting compound in Formula 1 may be represented by Formula 5-1. 
     
       
         
         
             
             
         
       
     
     In addition, in Formula 5-1, X may be B, each of Y 1  and Y 2  may be NR 1 , and each of the A and B rings may be a benzene ring. Namely, the emitting compound in Formula 1 may be represented by one of Formula 5-2. 
     
       
         
         
             
             
         
       
     
     In Formula 5-2, adjacent two of four R 4  or R 5  and R 6  is connected to form a fused ring, and at least one of the other four of R 4 , R 5  and R 6  is D-substituted C1 to C10 alkyl group. Each of R 41  to R 47  is independently selected from the group consisting of hydrogen, deuterium (D), C1 to C10 alkyl group unsubstituted or substituted with deuterium, C6 to C30 arylamine group unsubstituted or substituted with deuterium or C1 to C10 alkyl, C6 to C30 aryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl, and C5 to C30 heteroaryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl. 
     For example, in Formula 5-2, R 1  may be C6 to C30 aryl, e.g., phenyl. One of the other four of R 4 , R 5  and R 6  may be D-substituted C1 to C10 alkyl, e.g., CD3, and the other of the other four of R 4 , R 5  and R 6  may be hydrogen. The fused ring formed by adjacent two of four R 4  or R 5  and R 6  may be C6 to C30 aromatic ring, e.g., benzene ring, and R 41  to R 47  may be hydrogen. The compound of Formula 5-1 or Formula 5-2 may be one of the compounds 4-1 to 4-4 in Formula 6. 
     Alternatively, in Formula 5-1, the A ring may be benzene ring, and the B ring may be heteroaromatic fused ring. Namely, the emitting compound in Formula 5-1 may be represented by Formula 5-3. 
     
       
         
         
             
             
         
       
     
     In Formula 5-3, Y 5  is O or S. Adjacent two of four R 4  or R 5  and R 6  is connected to form a fused ring, and at least one of the other four of R 4 , R 5  and R 6  is D-substituted C1 to C10 alkyl group. Each of R 8 , R 9  and R 51  to R 54  is independently selected from the group consisting of hydrogen, deuterium (D), C1 to C10 alkyl group unsubstituted or substituted with deuterium, C6 to C30 arylamine group unsubstituted or substituted with deuterium or C1 to C10 alkyl, C6 to C30 aryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl, and C5 to C30 heteroaryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl, or adjacent two of R 51  to R 54  or R 8  and R 9  is connected to form a fused ring. At least one of the other four of R 8 , R 9  and R 51  to R 54  is D-substituted C1 to C10 alkyl group. Each of R 55  to R 57  is independently selected from the group consisting of hydrogen, deuterium (D), C1 to C10 alkyl group unsubstituted or substituted with deuterium, C6 to C30 arylamine group unsubstituted or substituted with deuterium or C1 to C10 alkyl, C6 to C30 aryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl, and C5 to C30 heteroaryl group unsubstituted or substituted with deuterium or C1 to C10 alkyl. 
     In Formula 5-3, X may be B, each of Y 1  and Y 2  may be NR 1 . Namely, the emitting compound in Formula 5-3 may be represented by Formula 5-4. 
     
       
         
         
             
             
         
       
     
     For example, in Formula 5-4, R 1  may be C6 to C30 aryl, e.g., phenyl. One of the other four of R 4 , R 5  and R 6  may be D-substituted C1 to C10 alkyl, e.g., CD3, and the other of the other four of R 4 , R 5  and R 6  may be hydrogen. Each of the fused ring formed by adjacent two of four R 4  or R 5  and R 6  and the fused ring formed by adjacent two of R 51  to R 54  or R 8  and R 9  may be C6 to C30 aromatic ring, e.g., benzene ring, and R 55  to R 57  may be hydrogen. The compound of Formula 5-3 or Formula 5-4 may be one of the compounds 4-5 to 4-8 in Formula 6. 
     The emitting compound of the present disclosure may be one of compounds in Formula 6. 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     The emitting compound in Formulas 1 to 6 provides blue emission and is used for the EML  240  in the OLED D. As a result, the lifespan of the OLED D and the organic light emitting device  100  is significantly increased. 
     Synthesis of the Host 
     1. Synthesis of Compound 1-1 
     (1) Compound I1-1c 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I1-1a 8.5 g (50 mmol), the compound I1-1b 18.6 g (50 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 300 mL of toluene were added and stirred/refluxed for 5 hours. After completion of the reaction, the resultant was filtered and concentrated. The mixture was separated by column chromatography to obtain 17.2 g of the compound I1-1c. (Yield 68%) 
     (2) Compound 1-1 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I1-1c 6.3 g (12.5 mmol) and tert-butylbenzene 60 mL were added. 45 mL (37.5 mmol) of n-butyllithium was dropwisely added at −78° C. After dropwise addition, the mixture was stirred at 60° C. for 3 hours. Then, nitrogen was blown at 60° C. to remove heptane. Boron tribromide 6.3 g (25 mmol) was dropwisely added at −78° C. After the dropwise addition, the mixture was stirred at room temperature for 1 hour, and 3.2 g (25 mmol) of N,N-diisopropylethylamine was dropwisely added at 0° C. After dropwise addition, the mixture was stirred at 120° C. for 2 hours. After the reaction was completed, an aqueous sodium acetate solution was added thereto and stirred at room temperature. The mixture was extracted with ethyl acetate, the organic layer was concentrated, and separated by column chromatography to obtain 1.3 g of the compound 1-1. (Yield 21%) 
     2. Synthesis of Compound 1-2 
     (1) Compound I1-2c 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I1-2a 8.5 g (50 mmol), the compound I1-2b 18.6 g (50 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 300 mL of toluene were added and stirred/refluxed for 5 hours. After the reaction was completed, the resultant was filtered and concentrated. The mixture was separated by column chromatography to obtain 16.9 g of the compound I1-2c. (Yield 67%) 
     (2) Compound 1-2 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I1-2c 6.3 g (12.5 mmol) and tert-butylbenzene 60 mL were added to a 500 mL reactor. 45 mL (37.5 mmol) of n-butyllithium was dropwisely added at −78° C. After dropwise addition, the mixture was stirred at 60° C. for 3 hours. Then, nitrogen was blown at 60° C. to remove heptane. Boron tribromide 6.3 g (25 mmol) was dropwisely added at −78° C. After the dropwise addition, the mixture was stirred at room temperature for 1 hour, and 3.2 g (25 mmol) of N,N-diisopropylethylamine was dropwisely added at 0° C. After dropwise addition, the mixture was stirred at 120° C. for 2 hours. After the reaction was completed, an aqueous sodium acetate solution was added thereto and stirred at room temperature. The mixture was extracted with ethyl acetate, the organic layer was concentrated, and separated by column chromatography to obtain 1.1 g of the compound 1-2. (Yield 19%) 
     3. Synthesis of Compound 1-4 
     (1) Compound I1-4c 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I1-4a 8.5 g (50 mmol), the compound I1-4b 19.4 g (50 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 300 mL of toluene were added and stirred/refluxed for 5 hours. After completion of the reaction, the resultant was filtered and concentrated. The mixture was separated by column chromatography to obtain 13.5 g of the compound I1-4c. (Yield 52%) 
     (2) Compound 1-4 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I1-4c 6.5 g (12.5 mmol) and tert-butylbenzene 60 mL were added. 45 mL (37.5 mmol) of n-butyllithium was dropwisely added at −78° C. After dropwise addition, the mixture was stirred at 60° C. for 3 hours. Then, nitrogen was blown at 60° C. to remove heptane. Boron tribromide 6.3 g (25 mmol) was dropwisely added at −78° C. After the dropwise addition, the mixture was stirred at room temperature for 1 hour, and 3.2 g (25 mmol) of N,N-diisopropylethylamine was dropwisely added at 0° C. After dropwise addition, the mixture was stirred at 120° C. for 2 hours. After the reaction was completed, an aqueous sodium acetate solution was added thereto and stirred at room temperature. The mixture was extracted with ethyl acetate, the organic layer was concentrated, and separated by column chromatography to obtain 0.9 g of the compound 1-4. (Yield 15%) 
     4. Synthesis of Compound 1-7 
     (1) Compound I1-7c 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I1-7a 8.5 g (50 mmol), the compound I1-7b 19.4 g (50 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 300 mL of toluene were added and stirred/refluxed for 5 hours. After completion of the reaction, the resultant was filtered and concentrated. The mixture was separated by column chromatography to obtain 16.9 g of the compound I1-7c. (Yield 65%) 
     (2) Compound 1-7 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I1-7c 6.5 g (12.5 mmol) and tert-butylbenzene 60 mL were added. 45 mL (37.5 mmol) of n-butyllithium was dropwisely added at −78° C. After dropwise addition, the mixture was stirred at 60° C. for 3 hours. Then, nitrogen was blown at 60° C. to remove heptane. Boron tribromide 6.3 g (25 mmol) was dropwisely added at −78° C. After the dropwise addition, the mixture was stirred at room temperature for 1 hour, and 3.2 g (25 mmol) of N,N-diisopropylethylamine was dropwisely added at 0° C. After dropwise addition, the mixture was stirred at 120° C. for 2 hours. After the reaction was completed, an aqueous sodium acetate solution was added thereto and stirred at room temperature. The mixture was extracted with ethyl acetate, the organic layer was concentrated, and separated by column chromatography to obtain 1.2 g of the compound 1-7. (Yield 20%) 
     5. Synthesis of Compound 1-8 
     (1) Compound I1-8c 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I1-8a 8.5 g (50 mmol), the compound I1-8b 18.6 g (50 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 300 mL of toluene were added and stirred/refluxed for 5 hours. After completion of the reaction, the resultant was filtered and concentrated. The mixture was separated by column chromatography to obtain 16.7 g of the compound I1-8c. (Yield 66%) 
     (2) Compound 1-8 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I1-8c 6.3 g (12.5 mmol) and tert-butylbenzene 60 mL were added. 45 mL (37.5 mmol) of n-butyllithium was dropwisely added at −78° C. After dropwise addition, the mixture was stirred at 60° C. for 3 hours. Then, nitrogen was blown at 60° C. to remove heptane. Boron tribromide 6.3 g (25 mmol) was dropwisely added at −78° C. After the dropwise addition, the mixture was stirred at room temperature for 1 hour, and 3.2 g (25 mmol) of N,N-diisopropylethylamine was dropwisely added at 0° C. After dropwise addition, the mixture was stirred at 120° C. for 2 hours. After the reaction was completed, an aqueous sodium acetate solution was added thereto and stirred at room temperature. The mixture was extracted with ethyl acetate, the organic layer was concentrated, and separated by column chromatography to obtain 1.1 g of the compound 1-8. (Yield 18%) 
     6. Synthesis of Compound 1-9 
     (1) Compound I1-9c 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I1-9a 8.5 g 50 mmol), t e compound I1-9b 19.4 g (50 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 300 mL of toluene were added and stirred under reflux for 5 hours. After the reaction was completed, the resultant was filtered and concentrated. The mixture was separated by column chromatography to obtain 18.5 g of the compound I1-9c. (Yield 71%) 
     (2) Compound 1-9 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I1-9c 6.5 g (12.5 mmol) and tert-butylbenzene 60 mL were added. 45 mL (37.5 mmol) of n-butyllithium was dropwisely added at −78° C. After dropwise addition, the mixture was stirred at 60° C. for 3 hours. Then, nitrogen was blown at 60° C. to remove heptane. Boron tribromide 6.3 g (25 mmol) was dropwisely added at −78° C. After the dropwise addition, the mixture was stirred at room temperature for 1 hour, and 3.2 g (25 mmol) of N,N-diisopropylethylamine was dropwisely added at 0° C. After dropwise addition, the mixture was stirred at 120° C. for 2 hours. After the reaction was completed, an aqueous sodium acetate solution was added thereto and stirred at room temperature. The mixture was extracted with ethyl acetate, the organic layer was concentrated, and separated by column chromatography to obtain 1.4 g of the compound 1-9. (Yield 23%) 
     7. Synthesis of Compound 2-1 
     (1) Compound I2-1c 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I2-1a 8.5 g (50 mmol), the compound I2-1b 21.1 g (50 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 300 mL of toluene were added and stirred under reflux for 5 hours. After completion of the reaction, the resultant was filtered and concentrated. The mixture was separated by column chromatography to obtain 17.7 g of the compound I2-1c. (Yield 64%) 
     (2) Compound 2-1 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound 12-1c 6.9 g (12.5 mmol) and tert-butylbenzene 60 mL were added. 45 mL (37.5 mmol) of n-butyllithium was dropwisely added at −78° C. After dropwise addition, the mixture was stirred at 60° C. for 3 hours. Then, nitrogen was blown at 60° C. to remove heptane. Boron tribromide 6.3 g (25 mmol) was dropwisely added at −78° C. After the dropwise addition, the mixture was stirred at room temperature for 1 hour, and 3.2 g (25 mmol) of N,N-diisopropylethylamine was dropwisely added at 0° C. After dropwise addition, the mixture was stirred at 120° C. for 2 hours. After the reaction was completed, an aqueous sodium acetate solution was added thereto and stirred at room temperature. The mixture was extracted with ethyl acetate, the organic layer was concentrated, and separated by column chromatography to obtain 1.2 g of the compound 2-1. (Yield 18%) 
     8. Synthesis of Compound 2-2 
     (1) Compound 12-2c 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound 12-2a 8.5 g (50 mmol), the compound 12-2b 21.1 g (50 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 300 mL of toluene were added and stirred under reflux for 5 hours. After the reaction was completed, the resultant was filtered and concentrated. The mixture was separated by column chromatography to obtain 18.0 g of the compound 12-2c. (Yield 65%) 
     (2) Compound 2-2 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound 12-2c 6.9 g (12.5 mmol) and tert-butylbenzene 60 mL were added to. 45 mL (37.5 mmol) of n-butyllithium was dropwisely added at −78° C. After dropwise addition, the mixture was stirred at 60° C. for 3 hours. Then, nitrogen was blown at 60° C. to remove heptane. Boron tribromide 6.3 g (25 mmol) was dropwisely added at −78° C. After the dropwise addition, the mixture was stirred at room temperature for 1 hour, and 3.2 g (25 mmol) of N,N-diisopropylethylamine was dropwisely added at 0° C. After dropwise addition, the mixture was stirred at 120° C. for 2 hours. After the reaction was completed, an aqueous sodium acetate solution was added thereto and stirred at room temperature. The mixture was extracted with ethyl acetate, the organic layer was concentrated, and separated by column chromatography to obtain 1.1 g of the compound 2-2. (Yield 16%) 
     9. Synthesis of Compound 2-3 
     (1) Compound 12-3c 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound 12-3a 8.5 g (50 mmol), the compound 12-3b 21.1 g (50 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 300 mL of toluene were added and stirred under reflux for 5 hours. After the reaction was completed, the resultant was filtered and concentrated. The mixture was separated by column chromatography to obtain 18.3 g of the compound 12-3c. (Yield 66%) 
     (2) Compound 2-3 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound 12-3c 6.9 g (12.5 mmol) and tert-butylbenzene 60 mL were added. 45 mL (37.5 mmol) of n-butyllithium was dropwisely added at −78° C. After dropwise addition, the mixture was stirred at 60° C. for 3 hours. Then, nitrogen was blown at 60° C. to remove heptane. Boron tribromide 6.3 g (25 mmol) was dropwisely added at −78° C. After the dropwise addition, the mixture was stirred at room temperature for 1 hour, and 3.2 g (25 mmol) of N,N-diisopropylethylamine was dropwisely added at 0° C. After dropwise addition, the mixture was stirred at 120° C. for 2 hours. After the reaction was completed, an aqueous sodium acetate solution was added thereto and stirred at room temperature. The mixture was extracted with ethyl acetate, the organic layer was concentrated, and separated by column chromatography to obtain 1.3 g of the compound 2-3. (Yield 19%) 
     10. Synthesis of Compound 2-4 
     (1) Compound 12-4c 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound 12-4a 8.5 g (50 mmol), the compound 12-4b 21.9 g (50 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 300 mL of toluene were added and stirred under reflux for 5 hours. After the reaction was completed, the resultant was filtered and concentrated. The mixture was separated by column chromatography to obtain 18.5 g of the compound 12-4c. (Yield 65%) 
     (2) Compound 2-4 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound 12-4c 7.1 g (12.5 mmol) and tert-butylbenzene 60 mL were added. 45 mL (37.5 mmol) of n-butyllithium was dropwisely added at −78° C. After dropwise addition, the mixture was stirred at 60° C. for 3 hours. Then, nitrogen was blown at 60° C. to remove heptane. Boron tribromide 6.3 g (25 mmol) was dropwisely added at −78° C. After the dropwise addition, the mixture was stirred at room temperature for 1 hour, and 3.2 g (25 mmol) of N,N-diisopropylethylamine was dropwisely added at 0° C. After dropwise addition, the mixture was stirred at 120° C. for 2 hours. After the reaction was completed, an aqueous sodium acetate solution was added thereto and stirred at room temperature. The mixture was extracted with ethyl acetate, the organic layer was concentrated, and separated by column chromatography to obtain 1.4 g of the compound 2-4. (Yield 20%) 
     11. Synthesis of Compound 2-6 
     (1) Compound 12-6c 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound 12-6a 8.5 g (50 mmol), the compound 12-6b 21.9 g (50 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 300 mL of toluene were added and stirred under reflux for 5 hours. After the reaction was completed, the resultant was filtered and concentrated. The mixture was separated by column chromatography to obtain 18.5 g of the compound 12-6c. (Yield 65%) 
     (2) Compound 2-6 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I2-6c 7.1 g (12.5 mmol) and tert-butylbenzene 60 mL were added. 45 mL (37.5 mmol) of n-butyllithium was dropwisely added at −78° C. After dropwise addition, the mixture was stirred at 60° C. for 3 hours. Then, nitrogen was blown at 60° C. to remove heptane. Boron tribromide 6.3 g (25 mmol) was dropwisely added at −78° C. After the dropwise addition, the mixture was stirred at room temperature for 1 hour, and 3.2 g (25 mmol) of N,N-diisopropylethylamine was dropwisely added at 0° C. After dropwise addition, the mixture was stirred at 120° C. for 2 hours. After the reaction was completed, an aqueous sodium acetate solution was added thereto and stirred at room temperature. The mixture was extracted with ethyl acetate, the organic layer was concentrated, and separated by column chromatography to obtain 1.6 g of the compound 2-6. (Yield 24%) 
     12. Synthesis of Compound 3-1 
     (1) Compound I3-1c 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I3-1a 8.5 g (50 mmol), the compound I3-1b 21.1 g (50 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 300 mL of toluene were added and stirred under reflux for 5 hours. After the reaction was completed, the resultant was filtered and concentrated. The mixture was separated by column chromatography to obtain 17.5 g of the compound I3-1c. (Yield 63%) 
     (2) Compound 3-1 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I3-1c 6.9 g (12.5 mmol) and tert-butylbenzene 60 mL were added. 45 mL (37.5 mmol) of n-butyllithium was dropwisely added at −78° C. After dropwise addition, the mixture was stirred at 60° C. for 3 hours. Then, nitrogen was blown at 60° C. to remove heptane. Boron tribromide 6.3 g (25 mmol) was dropwisely added at −78° C. After the dropwise addition, the mixture was stirred at room temperature for 1 hour, and 3.2 g (25 mmol) of N,N-diisopropylethylamine was dropwisely added at 0° C. After dropwise addition, the mixture was stirred at 120° C. for 2 hours. After the reaction was completed, an aqueous sodium acetate solution was added thereto and stirred at room temperature. The mixture was extracted with ethyl acetate, the organic layer was concentrated, and separated by column chromatography to obtain 1.4 g of the compound 3-1. (Yield 21%) 
     13. Synthesis of Compound 3-4 
     (1) Compound I3-4c 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I3-4a 8.5 g (50 mmol), the compound I3-4b 21.1 g (50 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 300 mL of toluene were added and stirred under reflux for 5 hours. After the reaction was completed, the resultant was filtered and concentrated. The mixture was separated by column chromatography to obtain 18.6 g of the compound I3-4c. (Yield 67%) 
     (2) Compound 3-4 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I3-4c 6.9 g (12.5 mmol) and tert-butylbenzene 60 mL were added. 45 mL (37.5 mmol) of n-butyllithium was dropwisely added at −78° C. After dropwise addition, the mixture was stirred at 60° C. for 3 hours. Then, nitrogen was blown at 60° C. to remove heptane. Boron tribromide 6.3 g (25 mmol) was dropwisely added at −78° C. After the dropwise addition, the mixture was stirred at room temperature for 1 hour, and 3.2 g (25 mmol) of N,N-diisopropylethylamine was dropwisely added at 0° C. After dropwise addition, the mixture was stirred at 120° C. for 2 hours. After the reaction was completed, an aqueous sodium acetate solution was added thereto and stirred at room temperature. The mixture was extracted with ethyl acetate, the organic layer was concentrated, and separated by column chromatography to obtain 1.3 g of the compound 3-4. (Yield 19%) 
     14. Synthesis of Compound 3-7 
     (1) Compound I3-7c 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I3-7a 8.5 g (50 mmol), the compound I3-7b 21.1 g (50 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 300 mL of toluene were added and stirred under reflux for 5 hours. After the reaction was completed, the resultant was filtered and concentrated. The mixture was separated by column chromatography to obtain 17.8 g of the compound I3-7c. (Yield 64%) 
     (2) Compound 3-7 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I3-7c 6.9 g (12.5 mmol) and tert-butylbenzene 60 mL were added. 45 mL (37.5 mmol) of n-butyllithium was dropwisely added at −78° C. After dropwise addition, the mixture was stirred at 60° C. for 3 hours. Then, nitrogen was blown at 60° C. to remove heptane. Boron tribromide 6.3 g (25 mmol) was dropwisely added at −78° C. After the dropwise addition, the mixture was stirred at room temperature for 1 hour, and 3.2 g (25 mmol) of N,N-diisopropylethylamine was dropwisely added at 0° C. After dropwise addition, the mixture was stirred at 120° C. for 2 hours. After the reaction was completed, an aqueous sodium acetate solution was added thereto and stirred at room temperature. The mixture was extracted with ethyl acetate, the organic layer was concentrated, and separated by column chromatography to obtain 1.4 g of the compound 3-7. (Yield 21%) 
     15. Synthesis of Compound 3-8 
     (1) Compound I3-8c 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I3-8a 8.5 g (50 mmol), the compound I3-8b 21.1 g (50 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 300 mL of toluene were added and stirred under reflux for 5 hours. After the reaction was completed, the resultant was filtered and concentrated. The mixture was separated by column chromatography to obtain 18.3 g of the compound I3-8c. (Yield 66%) 
     (2) Compound 3-8 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I3-8c 6.9 g (12.5 mmol) and tert-butylbenzene 60 mL were added. 45 mL (37.5 mmol) of n-butyllithium was dropwisely added at −78° C. After dropwise addition, the mixture was stirred at 60° C. for 3 hours. Then, nitrogen was blown at 60° C. to remove heptane. Boron tribromide 6.3 g (25 mmol) was dropwisely added at −78° C. After the dropwise addition, the mixture was stirred at room temperature for 1 hour, and 3.2 g (25 mmol) of N,N-diisopropylethylamine was dropwisely added at 0° C. After dropwise addition, the mixture was stirred at 120° C. for 2 hours. After the reaction was completed, an aqueous sodium acetate solution was added thereto and stirred at room temperature. The mixture was extracted with ethyl acetate, the organic layer was concentrated, and separated by column chromatography to obtain 1.3 g of the compound 3-8. (Yield 20%) 
     16. Synthesis of Compound 3-9 
     (1) Compound I3-9c 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I3-9a 8.5 g (50 mmol), the compound I3-9b 21.1 g (50 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 300 mL of toluene were added and stirred under reflux for 5 hours. After the reaction was completed, the resultant was filtered and concentrated. The mixture was separated by column chromatography to obtain 19.1 g of the compound I3-9c. (Yield 69%) 
     (2) Compound 3-9 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I3-9c 6.9 g (12.5 mmol) and tert-butylbenzene 60 mL were added. 45 mL (37.5 mmol) of n-butyllithium was dropwisely added at −78° C. After dropwise addition, the mixture was stirred at 60° C. for 3 hours. Then, nitrogen was blown at 60° C. to remove heptane. Boron tribromide 6.3 g (25 mmol) was dropwisely added at −78° C. After the dropwise addition, the mixture was stirred at room temperature for 1 hour, and 3.2 g (25 mmol) of N,N-diisopropylethylamine was dropwisely added at 0° C. After dropwise addition, the mixture was stirred at 120° C. for 2 hours. After the reaction was completed, an aqueous sodium acetate solution was added thereto and stirred at room temperature. The mixture was extracted with ethyl acetate, the organic layer was concentrated, and separated by column chromatography to obtain 1.1 g of the compound 3-9. (Yield 17%) 
     17. Synthesis of Compound 4-1 
     (1) Compound I4-1c 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I4-1a 8.5 g (50 mmol), the compound I4-1b 23.6 g (50 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 300 mL of toluene were added and stirred under reflux for 5 hours. After the reaction was completed, the resultant was filtered and concentrated. The mixture was separated by column chromatography to obtain 17.8 g of the compound I4-1c. (Yield 59%) 
     (2) Compound 4-1 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I4-1c 7.6 g (12.5 mmol) and tert-butylbenzene 60 mL were added. 45 mL (37.5 mmol) of n-butyllithium was dropwisely added at −78° C. After dropwise addition, the mixture was stirred at 60° C. for 3 hours. Then, nitrogen was blown at 60° C. to remove heptane. Boron tribromide 6.3 g (25 mmol) was dropwisely added at −78° C. After the dropwise addition, the mixture was stirred at room temperature for 1 hour, and 3.2 g (25 mmol) of N,N-diisopropyl ethyl amine was dropwisely added at 0° C. After dropwise addition, the mixture was stirred at 120° C. for 2 hours. After the reaction was completed, an aqueous sodium acetate solution was added thereto and stirred at room temperature. The mixture was extracted with ethyl acetate, the organic layer was concentrated, and separated by column chromatography to obtain 1.4 g of the compound 4-1. (Yield 19%) 
     18. Synthesis of Compound 4-3 
     (1) Compound I4-3c 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I4-3a 8.5 g (50 mmol), the compound I4-3b 23.6 g (50 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 300 mL of toluene were added and stirred under reflux for 5 hours. After the reaction was completed, the resultant was filtered and concentrated. The mixture was separated by column chromatography to obtain 20.5 g of the compound I4-3c. (Yield 68%) 
     (2) Compound 4-3 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I4-3c 7.6 g (12.5 mmol) and tert-butylbenzene 60 mL were added. 45 mL (37.5 mmol) of n-butyllithium was dropwisely added at −78° C. After dropwise addition, the mixture was stirred at 60° C. for 3 hours. Then, nitrogen was blown at 60° C. to remove heptane. Boron tribromide 6.3 g (25 mmol) was dropwisely added at −78° C. After the dropwise addition, the mixture was stirred at room temperature for 1 hour, and 3.2 g (25 mmol) of N,N-diisopropylethylamine was dropwisely added at 0° C. After dropwise addition, the mixture was stirred at 120° C. for 2 hours. After the reaction was completed, an aqueous sodium acetate solution was added thereto and stirred at room temperature. The mixture was extracted with ethyl acetate, the organic layer was concentrated, and separated by column chromatography to obtain 1.6 g of the compound 4-3. (Yield 22%) 
     19. Synthesis of Compound 4-4 
     (1) Compound I4-4c 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I4-4a 8.5 g (50 mmol), the compound I4-4b 23.6 g (50 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 300 mL of toluene were added and stirred under reflux for 5 hours. After the reaction was completed, the resultant was filtered and concentrated. The mixture was separated by column chromatography to obtain 20.8 g of the compound I4-4c. (Yield 69%) 
     (2) Compound 4-4 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I4-4c 7.6 g (12.5 mmol) and tert-butylbenzene 60 mL were added. 45 mL (37.5 mmol) of n-butyllithium was dropwisely added at −78° C. After dropwise addition, the mixture was stirred at 60° C. for 3 hours. Then, nitrogen was blown at 60° C. to remove heptane. Boron tribromide 6.3 g (25 mmol) was dropwisely added at −78° C. After the dropwise addition, the mixture was stirred at room temperature for 1 hour, and 3.2 g (25 mmol) of N,N-diisopropylethylamine was dropwisely added at 0° C. After dropwise addition, the mixture was stirred at 120° C. for 2 hours. After the reaction was completed, an aqueous sodium acetate solution was added thereto and stirred at room temperature. The mixture was extracted with ethyl acetate, the organic layer was concentrated, and separated by column chromatography to obtain 1.4 g of the compound 4-4. (Yield 19%) 
     20. Synthesis of Compound 4-7 
     (1) Compound I4-7c 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I4-7a 35.9 g (110 mmol), the compound I4-7b 9.1 g (50 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 300 mL of toluene were added and stirred under reflux for 5 hours. After the reaction was completed, the resultant was filtered and concentrated. The mixture was separated by column chromatography to obtain 26.6 g of the compound I4-7c. (Yield 70%) 
     (2) Compound 4-7 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I4-7c 9.5 g (12.5 mmol) and tert-butylbenzene 60 mL were added. 45 mL (37.5 mmol) of n-butyllithium was dropwisely added at −78° C. After dropwise addition, the mixture was stirred at 60° C. for 3 hours. Then, nitrogen was blown at 60° C. to remove heptane. Boron tribromide 6.3 g (25 mmol) was dropwisely added at −78° C. After the dropwise addition, the mixture was stirred at room temperature for 1 hour, and 3.2 g (25 mmol) of N,N-diisopropylethylamine was dropwisely added at 0° C. After dropwise addition, the mixture was stirred at 120° C. for 2 hours. After the reaction was completed, an aqueous sodium acetate solution was added thereto and stirred at room temperature. The mixture was extracted with ethyl acetate, the organic layer was concentrated, and separated by column chromatography to obtain 1.5 g of the compound 4-7. (Yield 16%) 
     21. Synthesis of Compound 4-8 
     (1) Compound I4-8c 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I4-8a 35.9 g (110 mmol), the compound I4-8b 9.1 g (50 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 300 mL of toluene were added and stirred under reflux for 5 hours. After the reaction was completed, the resultant was filtered and concentrated. The mixture was separated by column chromatography to obtain 25.9 g of the compound I4-8c. (Yield 68%) 
     (2) Compound 4-8 
     
       
         
         
             
             
         
       
     
     In the 500 mL reactor, the compound I4-8c 9.5 g (12.5 mmol) and tert-butylbenzene 60 mL were added. 45 mL (37.5 mmol) of n-butyllithium was dropwisely added at −78° C. After dropwise addition, the mixture was stirred at 60° C. for 3 hours. Then, nitrogen was blown at 60° C. to remove heptane. Boron tribromide 6.3 g (25 mmol) was dropwisely added at −78° C. After the dropwise addition, the mixture was stirred at room temperature for 1 hour, and 3.2 g (25 mmol) of N,N-diisopropylethylamine was dropwisely added at 0° C. After dropwise addition, the mixture was stirred at 120° C. for 2 hours. After the reaction was completed, an aqueous sodium acetate solution was added thereto and stirred at room temperature. The mixture was extracted with ethyl acetate, the organic layer was concentrated, and separated by column chromatography to obtain 1.4 g of the compound 4-8. (Yield 15%) 
     In the EML  240 , the first compound  242  acts as a dopant (emitter) to emit the blue light. 
     In addition, the EML  240  may further include a second compound  244  as a host. In this instance, in the EML  240 , the first compound  242  may have a weight % of about 0.1 to 30, or about 0.1 to 10, and alternatively about 1 to 5. The EML  240  may have a thickness of about 10 to 500 Å, or about 50 to 400 Å, and alternatively about 100 to 300 Å. 
     The second compound  244  as the host may be an anthracene derivative. For example, the second compound  244  may be represented by Formula 7. 
     
       
         
         
             
             
         
       
     
     In Formula 7, each of Ar 1  and Ar 2  is independently C6 to C30 aryl group or C5 to C30 heteroaryl group. L is a single bond or C6 to C30 arylene group. In this instance, hydrogens in the anthracene derivative are not deuterated or partially or wholly deuterated. Namely, none, a part or all of the hydrogens in the anthracene derivative is substituted by deuterium. 
     In Formula 7, each of Ar 1  and Ar 2  may be selected from the group consisting of phenyl, naphthyl, dibenzofuranyl and fused dibenzofuranyl, and L may be the single bond or phenylene. 
     For example, Ar 1  may be selected from the group consisting of naphthyl, dibenzofuranyl, phenyl-dibenzofuranyl and fused dibenzofuranyl, and Ar 2  may be selected from the group consisting of phenyl and naphthyl. In an aspect, Ar 1  and Ar 2  may be naphthyl, and L may be the single bond or phenylene. 
     In Formula 7, the anthracene core may be partially or wholly deuterated, or each of Ar 1 , Ar 2 , L may be partially or wholly deuterated. Alternatively, each of the anthracene core, Ar 1 , Ar 2 , L may be partially or wholly deuterated. 
     The second compound  244  in Formula 7 may be one of compounds in Formula 8. 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     The HIL  210  may include at least one compound selected from 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 or NPD), 1,4,5,8,9,11-hexaazatriphenylenehexacarbonitrile(dipyrazino2,3-f:2′3′-hquinoxaline-2,3,6,7,10,11-hexacarbonitrile (HAT-CN), 1,3,5-tris4-(diphenylamino)phenylbenzene (TDAPB), poly(3,4-ethylenedioxythiphene)polystyrene sulfonate (PEDOT/PSS), and N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine. Alternatively, the HIL  210  may include a compound in Formula 15 as a host and a compound in Formula 16 as a dopant. 
     The HTL  220  may include at least one compound selected from the group consisting of N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine (TPD), NPB (or NPD), 4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP), polyN,N′-bis(4-butylpnehyl)-N,N′-bis(phenyl)-benzidine (poly-TPD), (poly(9,9-dioctylfluorenyl-2,7-diyl)-co-(4,4′-(N-(4-sec-butylphenyl)diphenylamine)) (TFB), di-4-(N,N-di-p-tolyl-amino)-phenylcyclohexane (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, and N-(biphenyl-4-yl)-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)biphenyl-4-amine. Alternatively, the HTL  220  may include a compound of Formula 15. 
     The EBL  230 , which is disposed between the HTL  220  and the EML  240 , is formed to prevent the electron toward the HTL  220 . The EBL  230  includes the electron blocking material of the amine derivative. The electron blocking material is represented by Formula 9. 
     
       
         
         
             
             
         
       
     
     In Formula 9, L is C6 to C30 arylene group, and a is 0 or 1. Each of R 1  and R 2  is independently selected from the group consisting of C6 to C30 aryl group and C5 to C30 heteroaryl group. 
     For example, L may be phenylene, and each of R 1  and R 2  may be selected from the group consisting of biphenyl, fluorenyl, carbazolyl, phenylcarbazolyl, carbazolylphenyl, dibenzothiophenyl and dibenzofuranyl. 
     Namely, the electron blocking material may be an amine derivative substituted by spirofluorene (e.g., “spirofluorene-substituted amine derivative”). 
     The electron blocking material of Formula 9 may be one of the followings of Formula 10: 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     The HBL  250 , which is disposed between the EML  240  and the EIL,  260 , is formed to prevent the hole toward the EIL,  260 . The HBL  250  includes the hole blocking material of the azine derivative. The azine derivative as the hole blocking material is represented by Formula 11. 
     
       
         
         
             
             
         
       
     
     In Formula 11, each of Y 1  to Y 5  is independently CR 1  or N, and one to three of Y 1  to Y 5  is N. R 1  is independently C6˜C 30  aryl group. L is C6˜C 30  arylene group, and R 2  is C6˜C 30  aryl group or C5˜C 30  hetero aryl group. R 3  is hydrogen, or adjacent two of R 3  form a fused ring. “a” is 0 or 1, “b” is 1 or 2, and “c” is an integer of 0 to 4. 
     The hole blocking material of Formula 11 may be one of the followings of Formula 12. 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     Alternatively, the HBL  250  may include the benzimidazole derivative as the hole blocking material. For example, the benzimidazole derivative as the hole blocking material is represented by Formula 13. 
     
       
         
         
             
             
         
       
     
     In Formula 13, Ar is C 10 ˜C 30  arylene group, R 1  is C 6 ˜C 30  aryl group or C 5 ˜C 30  hetero aryl group, and R 2  is hydrogen, C 1 ˜C 10  alkyl group or C 6 ˜C 30  aryl group. 
     For example, Ar may be naphthylene or anthracenylene, R 1  may be benzimidazole or phenyl, and R 2  may be methyl, ethyl or phenyl. 
     The hole blocking material of Formula 13 may be one of the followings of Formula 14. 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     The HBL  250  may include at least one of the hole blocking material in Formula 11 and the hole blocking material in Formula 13. 
     In this instance, a thickness of EML  240  may be greater than each of that of the EBL  230  and the HBL  250  and may be smaller than that of the HTL  220 . For example, the EML  240  may have a thickness of about 150 to 250 Å, each of the EBL  230  and the HBL  250  may have a thickness of about 50 to 150 Å, and the HTL  220  may have a thickness of about 900 to 1100 Å. The EBL  230  and the HBL  250  may have the same thickness. 
     The HBL  250  may include the compound in Formula 11 and the compound in Formula 13. For example, in the HBL  250 , the compound in Formula 11 and the compound in Formula 13 may have the same weight %. 
     In this instance, a thickness of the EML  240  may be greater than that of the EBL  250  and may be smaller than that of the HBL  250 . In addition, the thickness of the HBL  250  may be smaller than that of the HTL  220 . For example, the EML  240  may have a thickness of about 200 to 300 Å, and the EBL may have a thickness of about 50 to 150 Å. The HBL  250  may have a thickness of about 250 to 350 Å, and the HTL  220  may have a thickness of about 800 to 1000 Å. 
     The electron blocking material in Formula 11 and/or Formula 13 has excellent hole blocking property and excellent electron transporting property. Accordingly, an electron transporting layer may be presented, and the HBL  250  may directly contact the HIL  260  or the second electrode  164 . 
     The EIL  260  may include at least one of an alkali metal, such as Li, an alkali halide compound, such as LiF, CsF, NaF, or BaF 2 , and an organo-metallic compound, such as Liq, lithium benzoate, or sodium stearate, but it is not limited thereto. Alternatively, the EIL  260  may include a compound of Formula 17 as a host and an alkali metal as a dopant. 
     In the OLED D, the EML  240  includes the emitting compound  242  in Formula 1 such that the lifespan of the OLED D and the organic light emitting display device  100  is significantly improved. 
     [Organic Light Emitting Diode] 
     The anode (ITO, 0.5 mm), the HIL (Formula 15 (97 wt %) and Formula 16 (3 wt %), 100 Å), the HTL (Formula 15, 1000 Å), the EBL (the compound EBL-11 in Formula 10, 100 Å), the EML (the compound H-1 in Formula 8 (host, 98 wt %) and dopant (2 wt %), 200 Å), the HBL (the compound E1 in Formula 12, 100 Å), the EIL (Formula 17 (98 wt %) and Li (2 wt %), 200 Å) and the cathode (Al, 500 Å) was sequentially deposited. An encapsulation film is formed by using an UV curable epoxy and a moisture getter to form the OLED. 
     
       
         
         
             
             
         
       
     
     (1) Comparative Examples 1 and 2 (Ref1 and Ref2) 
     The compound “Ref-1” in Formula 18 and the compound “Ref-2” in Formula 19 are respectively used as the dopant to form the EML. 
     (2) Examples 1 to 2l (Ex1 to Ex21) 
     The compounds 1-1, 1-2, 1-4, 1-7 to 1-9, 2-1 to 2-4, 2-6, 3-1, 3-4, 3-7 to 3-9, 4-1, 4-3, 4-4, 4-7 and 4-9 in Formula 6 are respectively used as the dopant to form the EML. 
     
       
         
         
             
             
         
       
     
     The properties, i.e., voltage (V), external quantum efficiency (EQE), color coordinate (CIE) and lifespan (T 95 ), of the OLEDs manufactured in Comparative Examples 1 and 2 and Examples 1 to 21 are measured and listed in Tables 1 and 2. The properties of the OLED were measured at the room temperature using a current source (KEITHLEY) and a photometer (PR 650). The driving voltage, the external quantum efficiency, and the color coordinate were measured under the condition of a current density of 10 mA/cm 2 , and the lifespan was measured at 40° C. and the time to reach 95% of the lifespan under the 22.5 mA/cm 2  condition. 
     
       
         
           
               
               
               
               
               
               
             
               
                 TABLE 1 
               
               
                   
               
               
                   
                 Dopant 
                 V 
                 EQE (%) 
                 CIE(x, y) 
                 T 95  (hr) 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Ref1 
                 Ref-1 
                 3.95 
                 6.31 
                 (0.140, 0.060) 
                 76 
               
               
                 Ref2 
                 Ref-2 
                 3.94 
                 6.28 
                 (0.140, 0.075) 
                 72 
               
               
                 Ex1 
                 1-1 
                 3.93 
                 6.42 
                 (0.141, 0.128) 
                 115 
               
               
                 Ex2 
                 1-2 
                 3.94 
                 6.25 
                 (0.140, 0.121) 
                 109 
               
               
                 Ex3 
                 1-4 
                 3.91 
                 6.21 
                 (0.140, 0.120) 
                 114 
               
               
                 Ex4 
                 1-7 
                 3.91 
                 6.35 
                 (0.140, 0.123) 
                 120 
               
               
                 Ex5 
                 1-8 
                 3.90 
                 5.99 
                 (0.141, 0.120) 
                 115 
               
               
                 Ex6 
                 1-9 
                 3.97 
                 6.08 
                 (0.140, 0.119) 
                 103 
               
               
                 Ex7 
                 2-1 
                 3.95 
                 6.15 
                 (0.140, 0.078) 
                 105 
               
               
                 Ex8 
                 2-2 
                 3.96 
                 6.32 
                 (0.140, 0.186) 
                 111 
               
               
                 Ex9 
                 2-3 
                 3.92 
                 6.75 
                 (0.141, 0.129) 
                 117 
               
               
                 Ex10 
                 2-4 
                 3.88 
                 6.66 
                 (0.140, 0.079) 
                 101 
               
               
                 Ex11 
                 2-6 
                 3.90 
                 6.49 
                 (0.142, 0.125) 
                 105 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
               
               
               
             
               
                 TABLE 2 
               
               
                   
               
               
                   
                 Dopant 
                 V 
                 EQE (%) 
                 CIE(x, y) 
                 T 95  (hr) 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Ex12 
                 3-1 
                 3.99 
                 6.38 
                 (0.141, 0.071) 
                 110 
               
               
                 Ex13 
                 3-4 
                 3.98 
                 6.47 
                 (0.140, 0.178) 
                 106 
               
               
                 Ex14 
                 3-7 
                 3.96 
                 5.72 
                 (0.140, 0.046) 
                 108 
               
               
                 Ex15 
                 3-8 
                 3.98 
                 5.44 
                 (0.141, 0.045) 
                 102 
               
               
                 Ex16 
                 3-9 
                 4.01 
                 5.51 
                 (0.140, 0.046) 
                 99 
               
               
                 Ex17 
                 4-1 
                 3.88 
                 6.28 
                 (0.140, 0.055) 
                 111 
               
               
                 Ex18 
                 4-3 
                 3.89 
                 6.29 
                 (0.140, 0.087) 
                 114 
               
               
                 Ex19 
                 4-4 
                 3.92 
                 6.45 
                 (0.141, 0.115) 
                 109 
               
               
                 Ex20 
                 4-7 
                 3.91 
                 6.50 
                 (0.140, 0.095) 
                 102 
               
               
                 Ex21 
                 4-8 
                 3.91 
                 6.42 
                 (0.140, 0.127) 
                 118 
               
               
                   
               
            
           
         
       
     
     As shown in Tables 1 and 2, in comparison to the OLED of Ref1 and Ref2, the lifespan of the OLED in Ex1 to Ex21 using the emitting compound of the present disclosure as the dopant is significantly improved. 
     Particularly, as seen from Examples 1, 3 to 5, and 12 to 14, when the compounds 1-1, 1-4, 1-7, 1-8, 3-1, 3-4 and 3-7, in which the carbon atom being adjacent to the nitrogen atom is substituted by D-substituted alkyl group, e.g., CD 3 , are used as the dopant, the lifespan of the OLED is further increased. 
     In addition, as seen from Examples 8, 9 and 11, when the compounds 2-2, 2-3 and 2-6, in which the carbon atom being adjacent to the hetero-atom in the five-membered ring is substituted by D-substituted alkyl group, e.g., CD 3 , are used as the dopant, the lifespan of the OLED is further increased. 
       FIG. 4  is a schematic cross-sectional view illustrating an OLED having a tandem structure of two emitting units for the organic light emitting display device according to the first aspect of the present disclosure. 
     As shown in  FIG. 4 , the OLED D includes the first and second electrodes  160  and  164  facing each other and the organic emitting layer  162  between the first and second electrodes  160  and  164 . The organic emitting layer  162  includes a first emitting part  310  including a first EML  320 , a second emitting part  330  including a second EML  340  and a charge generation layer (CGL)  350  between the first and second emitting parts  310  and  330 . The organic light emitting display device  100  (of  FIG. 2 ) includes a red pixel, a green pixel and a blue pixel, and the OLED D is positioned in the blue pixel. 
     One of the first and second electrodes  160  and  164  is an anode, and the other one of the first and second electrodes  160  and  164  is cathode. In addition, one of the first and second electrodes  160  and  164  may be a transparent (or a semi-transparent) electrode, and the other one of the first and second electrodes  160  and  164  may be a reflection electrode. 
     The CGL  350  is positioned between the first and second emitting parts  310  and  330 , and the first emitting part  310 , the CGL  350  and the second emitting part  330  are sequentially stacked on the first electrode  160 . Namely, the first emitting part  310  is positioned between the first electrode  160  and the CGL  350 , and the second emitting part  320  is positioned between the second electrode  160  and the CGL  350 . 
     The first emitting part  310  includes a first EML  320 . In addition, the first emitting part  310  may further include a first EBL  316  between the first electrode  160  and the first EML  320  and a first HBL  318  between the first EML  320  and the CGL  350 . 
     In addition, the first emitting part  310  may further include a first HTL  314  between the first electrode  160  and the first EBL  316  and an HIL  312  between the first electrode  160  and the first HTL  314 . 
     The first EML  320  includes the emitting compound in Formula 1 as a first compound  322  and provides blue emission. For example, the first compound  322  in the first EML  320  may be one of the compounds in Formula 6. 
     The EML  320  may further include a second compound  324 . For example, the second compound  324  may be represented by Formula 7 and may be one of the compounds in Formula 8. 
     In the first EML  320 , the first compound  322  has a weight % being smaller than the second compound  324 . The first compound  322  may act as a dopant (an emitter), and the second compound  324  may act as a host. For example, in the first EML  320 , the first compound  322  may have a weight % of about 0.1 to 30. To provide sufficient emitting efficiency and lifespan, the weight % of the first compound  322  may be about 0.1 to 10, or about 1 to 5. 
     The first EBL  316  may include the compound in Formula 9 as the electron blocking material. In addition, the first HBL  318  may include at least one of the compounds in Formula 11 and Formula 13 as the hole blocking material. 
     The second emitting part  330  includes the second EML  340 . In addition, the second emitting part  330  may further include a second EBL  334  between the CGL  350  and the second EML  340  and a second HBL  336  between the second EML  340  and the second electrode  164 . 
     In addition, the second emitting part  330  may further include a second HTL  332  between the CGL  350  and the second EBL  334  and an EIL  338  between the second HBL  336  and the second electrode  164 . 
     The second EML  340  includes the emitting compound in Formula 1 as a third compound  342  and provides blue emission. For example, the third compound  342  in the second EML  340  may be one of the compounds in Formula 6. 
     The second EML  340  may further include a fourth compound  344 . For example, the fourth compound  344  may be represented by Formula 7 and may be one of the compounds in Formula 8. 
     In the second EML  340 , the third compound  342  may have a weight % being less than the fourth compound  344 . In the second EML  340 , the third compound  342  may act as a dopant (an emitter), and the fourth compound  344  may act as a host. For example, in the second EML  340 , the third compound  342  has a weight % of about 0.1 to 30. To provide sufficient emitting efficiency and lifespan, the weight % of the third compound  342  may be about 0.1 to 10, or about 1 to 5. 
     The third compound  342  in the second EML  340  and the first compound  322  in the first EML  320  may be same or different, and the fourth compound  344  in the second EML  340  and the second compound  324  in the first EML  320  may be same or different. In addition, the weight % of the first compound  322  in the first EML  320  and the weight % of the third compound  342  in the second EML  340  may be same or different. 
     The second EBL  334  may include the electron blocking material in Formula 9. In addition, the second HBL  336  may include at least one of the hole blocking material in Formula 11 and the hole blocking material in Formula 13. 
     The CGL  350  is positioned between the first and second emitting parts  310  and  330 . Namely, the first and second emitting parts  310  and  330  are connected through the CGL  350 . The CGL  350  may be a P-N junction CGL of an N-type CGL  352  and a P-type CGL  354 . 
     The N-type CGL  352  is positioned between the first HBL  318  and the second HTL  332 , and the P-type CGL  354  is positioned between the N-type CGL  352  and the second HTL  332 . 
     In the OLED D, since each of the first and second EMLs  320  and  340  includes the emitting compound in Formula 1 as the first and third compounds  322  and  342 , respectively, the emitting efficiency and the lifespan of the OLED D and the organic light emitting display device  100  are improved. 
     In addition, since the first and second emitting parts  310  and  330  for emitting blue light are stacked, the organic light emitting display device  100  provides an image having high color temperature. 
       FIG. 5  is a schematic cross-sectional view illustrating an organic light emitting display device according to a second aspect of the present disclosure, and  FIG. 6  is a schematic cross-sectional view illustrating an OLED having a tandem structure of two emitting parts for the organic light emitting display device according to the second aspect of the present disclosure.  FIG. 7  is a schematic cross-sectional view illustrating an OLED having a tandem structure of three emitting parts for the organic light emitting display device according to the second aspect of the present disclosure. 
     As shown in  FIG. 5 , the organic light emitting display device  400  includes a first substrate  410 , where a red pixel BP, a green pixel GP and a blue pixel BP are defined, a second substrate  470  facing the first substrate  410 , an OLED D, which is positioned between the first and second substrates  410  and  470  and providing white emission, and a color filter layer  480  between the OLED D and the second substrate  470 . 
     Each of the first and second substrates  410  and  470  may be a glass substrate or a flexible substrate. For example, each of the first and second substrates  410  and  470  may be a polyimide (PI) substrate, a polyethersulfone (PES) substrate, a polyethylenenaphthalate (PEN) substrate, a polyethylene terephthalate (PET) substrate or a polycarbonate (PC) substrate. 
     A buffer layer  420  is formed on the substrate, and the TFT Tr corresponding to each of the red, green and blue pixels RP, GP and BP is formed on the buffer layer  420 . The buffer layer  420  may be omitted. 
     A semiconductor layer  422  is formed on the buffer layer  420 . The semiconductor layer  422  may include an oxide semiconductor material or polycrystalline silicon. 
     A gate insulating layer  424  is formed on the semiconductor layer  422 . The gate insulating layer  424  may be formed of an inorganic insulating material such as silicon oxide or silicon nitride. 
     A gate electrode  430 , which is formed of a conductive material, e.g., metal, is formed on the gate insulating layer  424  to correspond to a center of the semiconductor layer  422 . 
     An interlayer insulating layer  432 , which is formed of an insulating material, is formed on the gate electrode  430 . The interlayer insulating layer  432  may be formed of an inorganic insulating material, e.g., silicon oxide or silicon nitride, or an organic insulating material, e.g., benzocyclobutene or photo-acryl. 
     The interlayer insulating layer  432  includes first and second contact holes  434  and  436  exposing both sides of the semiconductor layer  422 . The first and second contact holes  434  and  436  are positioned at both sides of the gate electrode  430  to be spaced apart from the gate electrode  430 . 
     A source electrode  440  and a drain electrode  442 , which are formed of a conductive material, e.g., metal, are formed on the interlayer insulating layer  432 . 
     The source electrode  440  and the drain electrode  442  are spaced apart from each other with respect to the gate electrode  430  and respectively contact both sides of the semiconductor layer  422  through the first and second contact holes  434  and  436 . 
     The semiconductor layer  422 , the gate electrode  430 , the source electrode  440  and the drain electrode  442  constitute the TFT Tr. The TFT Tr serves as a driving element. Namely, the TFT Tr may correspond to the driving TFT Td (of  FIG. 1 ). 
     Although not shown, the gate line and the data line cross each other to define the pixel, and the switching TFT is formed to be connected to the gate and data lines. The switching TFT is connected to the TFT Tr as the driving element. 
     In addition, the power line, which may be formed to be parallel to and spaced apart from one of the gate and data lines, and the storage capacitor for maintaining the voltage of the gate electrode of the TFT Tr in one frame may be further formed. 
     A passivation layer  450 , which includes a drain contact hole  452  exposing the drain electrode  442  of the TFT Tr, is formed to cover the TFT Tr. 
     A first electrode  460 , which is connected to the drain electrode  442  of the TFT Tr through the drain contact hole  452 , is separately formed in each pixel and on the passivation layer  450 . The first electrode  460  may be an anode and may be formed of a conductive material, e.g., a transparent conductive oxide (TCO), having a relatively high work function. For example, the first electrode  460  may be formed of indium-tin-oxide (ITO), indium-zinc-oxide (IZO), indium-tin-zinc-oxide (ITZO), tin oxide (SnO), zinc oxide (ZnO), indium-copper-oxide (ICO) or aluminum-zinc-oxide (Al:ZnO, AZO). 
     When the organic light emitting display device  400  is operated in a bottom-emission type, the first electrode  460  may have a single-layered structure of the transparent conductive material layer. When the Organic light emitting display device  400  is operated in a top-emission type, a reflection electrode or a reflection layer may be formed under the first electrode  160 . For example, the reflection electrode or the reflection layer may be formed of silver (Ag) or aluminum-palladium-copper (APC) alloy. In this instance, the first electrode  460  may have a triple-layered structure of ITO/Ag/ITO or ITO/APC/ITO. 
     A bank layer  466  is formed on the passivation layer  450  to cover an edge of the first electrode  460 . Namely, the bank layer  466  is positioned at a boundary of the pixel and exposes a center of the first electrode  460  in the pixel. Since the OLED D emits the white light in the red, green and blue pixels RP, GP and BP, the organic emitting layer  162  may be formed as a common layer in the red, green and blue pixels RP, GP and BP without separation. The bank layer  466  may be formed to prevent a current leakage at an edge of the first electrode  460  and may be omitted. 
     An organic emitting layer  462  is formed on the first electrode  460 . 
     Referring to  FIG. 6 , the OLED D includes the first and second electrodes  460  and  464  facing each other and the organic emitting layer  462  between the first and second electrodes  460  and  464 . The organic emitting layer  462  includes a first emitting part  710  including a first EML  720 , a second emitting part  730  including a second EML  740  and a charge generation layer (CGL)  750  between the first and second emitting parts  710  and  730 . 
     The first electrode  460  may be formed of a conductive material having a relatively high work function to serve as an anode for injecting a hole into the organic emitting layer  462 . The second electrode  464  may be formed of a conductive material having a relatively low work function to serve as a cathode for injecting an electron into the organic emitting layer  462 . 
     The CGL  750  is positioned between the first and second emitting parts  710  and  730 , and the first emitting part  710 , the CGL  750  and the second emitting part  730  are sequentially stacked on the first electrode  460 . Namely, the first emitting part  710  is positioned between the first electrode  460  and the CGL  750 , and the second emitting part  720  is positioned between the second electrode  460  and the CGL  750 . 
     The first emitting part  710  includes a first EML  720 . In addition, the first emitting part  710  may further include a first EBL  716  between the first electrode  460  and the first EML  720  and a first HBL  718  between the first EML  720  and the CGL  750 . 
     In addition, the first emitting part  710  may further include a first HTL  714  between the first electrode  460  and the first EBL  716  and an HIL  712  between the first electrode  460  and the first HTL  714 . 
     The first EML  720  includes the emitting compound in Formula 1 as a first compound  722  and provides blue emission. For example, the first compound  722  in the first EML  720  may be one of the compounds in Formula 6. 
     The EML  720  may further include a second compound  724 . For example, the second compound  724  may be represented by Formula 7 and may be one of the compounds in Formula 8. 
     In the first EML  720 , the first compound  722  has a weight % being smaller than the second compound  724 . The first compound  722  may act as a dopant (an emitter), and the second compound  724  may act as a host. For example, in the first EML  720 , the first compound  722  may have a weight % of about 0.1 to 30. To provide sufficient emitting efficiency and lifespan, the weight % of the first compound  722  may be about 0.1 to 10, or about 1 to 5. 
     The first EBL  716  may include the compound in Formula 9 as the electron blocking material. In addition, the first HBL  718  may include at least one of the compounds in Formula 11 and Formula 13 as the hole blocking material. 
     The second emitting part  730  includes the second EML  740 . In addition, the second emitting part  730  may further include a second EBL  734  between the CGL  750  and the second EML  740  and a second HBL  736  between the second EML  740  and the second electrode  464 . 
     In addition, the second emitting part  730  may further include a second HTL  732  between the CGL  750  and the second EBL  734  and an EIL  738  between the second HBL  736  and the second electrode  464 . 
     The second EML  740  may be a yellow-green EML. For example, the second EML  740  may include a yellow-green dopant  743  and a host  745 . The yellow-green dopant  743  may be one of a yellow-green fluorescent compound, a yellow-green phosphorescent compound and a yellow-green delayed fluorescent compound. 
     In the second EML  740 , the host  745  may have a weight % of about 70 to 99.9, and the yellow-green dopant  743  may have a weight % of about 0.1 to 30. To provide sufficient emitting efficiency, the yellow-green dopant  744  may have a weight % of about 0.1 to 10, or about 1 to 5. 
     The second EBL  734  may include the compound in Formula 9 as the electron blocking material. In addition, the second HBL  736  may include at least one of the compounds in Formula 11 and Formula 13 as the hole blocking material. 
     The CGL  750  is positioned between the first and second emitting parts  710  and  730 . Namely, the first and second emitting parts  710  and  730  are connected through the CGL  750 . The CGL  750  may be a P-N junction CGL of an N-type CGL  752  and a P-type CGL  754 . 
     The N-type CGL  752  is positioned between the first HBL  718  and the second HTL  732 , and the P-type CGL  754  is positioned between the N-type CGL  752  and the second HTL  732 . 
     In  FIG. 6 , the first EML  720 , which is positioned between the first electrode  460  and the CGL  750 , includes the first compound  722  being the emitting compound of the present disclosure and the second compound  724  being the anthracene derivative, and the second EML  740 , which is positioned between the second electrode  464  and the CGL  750 , is the yellow-green EML. Alternatively, the first EML  720 , which is positioned between the first electrode  460  and the CGL  750 , may be the yellow-green EML, and the second EML  740 , which is positioned between the second electrode  464  and the CGL  750 , may include the emitting compound of the present disclosure and the anthracene derivative to be a blue EML. 
     In the OLED D, since the first EML  720  includes the emitting compound  722  of the present disclosure such that the emitting efficiency and the lifespan of the OLED D and the organic light emitting display device  400  are significantly improved. 
     The OLED D including the first emitting part  710  providing the blue emission and the second emitting part  730  providing the yellow-green emission, emits a white light. 
     Referring to  FIG. 7 , the organic emitting layer  462  includes a first emitting part  530  including a first EML  520 , a second emitting part  550  including a second EML  540 , a third emitting part  570  including a third EML  560 , a first CGL  580  between the first and second emitting parts  530  and  550  and a second CGL  590  between the second and third emitting parts  550  and  570 . 
     The first CGL  580  is positioned between the first and second emitting parts  530  and  550 , and the second CGL  590  is positioned between the second and third emitting parts  550  and  570 . Namely, the first emitting part  530 , the first CGL  580 , the second emitting part  550 , the second CGL  590  and the third emitting part  570  are sequentially stacked on the first electrode  460 . In other words, the first emitting part  530  is positioned between the first electrode  460  and the first CGL  570 , the second emitting part  550  is positioned between the first and second CGLs  580  and  590 , and the third emitting part  570  is positioned between the second electrode  460  and the second CGL  590 . 
     The first emitting part  530  may include an HIL  532 , a first HTL  534 , a first EBL  536 , the first EML  520  and a first HBL  538  sequentially stacked on the first electrode  460 . For example, the HIL  532 , the first HTL  534  and the first EBL  536  are positioned between the first electrode  460  and the first EML  520 , and the first HBL  538  is positioned between the first EML  520  and the first CGL  580 . 
     The first EML  520  includes the emitting compound in Formula 1 as a first compound  522  and provides blue emission. For example, the first compound  522  in the first EML  520  may be one of the compounds in Formula 6. 
     The EML  520  may further include a second compound  524 . For example, the second compound  524  may be represented by Formula 7 and may be one of the compounds in Formula 8. 
     In the first EML  520 , the first compound  522  has a weight % being smaller than the second compound  524 . The first compound  522  may act as a dopant (an emitter), and the second compound  524  may act as a host. For example, in the first EML  520 , the first compound  522  may have a weight % of about 0.1 to 30. To provide sufficient emitting efficiency and lifespan, the weight % of the first compound  522  may be about 0.1 to 10, or about 1 to 5. 
     The first EBL  536  may include the compound in Formula 9 as the electron blocking material. In addition, the first HBL  538  may include at least one of the compounds in Formula 11 and Formula 13 as the hole blocking material. 
     The second EML  550  may include a second HTL  552 , the second EML  540  and an electron transporting layer (ETL)  554 . The second HTL  552  is positioned between the first CGL  580  and the second EML  540 , and the ETL  554  is positioned between the second EML  540  and the second CGL  590 . 
     The second EML  540  may be a yellow-green EML. For example, the second EML  540  may include a host and a yellow-green dopant. 
     Alternatively, the second EML  540  may include a host, a red dopant and a green dopant. In this instance, the second EML  540  may has a single-layered structure or a double-layered structure of a lower layer including the host and the red dopant (or the green dopant) and an upper layer including the host and the green dopant (or the red dopant). 
     The second EML  540  may have a triple-layered structure of a first layer, which includes a host and a red dopant, a second layer, which includes a host and a yellow-green dopant, and a third layer, which includes a host and a green dopant. 
     The third emitting part  570  may include a third HTL  572 , a second EBL  574 , the third EML  560 , a second HBL  576  and an EIL  578 . 
     The third EML  560  includes the emitting compound in Formula 1 as a third compound  562  and provides blue emission. For example, the third compound  562  in the third EML  560  may be one of the compounds in Formula 6. 
     The third EML  560  may further include a fourth compound  564 . For example, the fourth compound  564  may be represented by Formula 7 and may be one of the compounds in Formula 8. 
     In the third EML  560 , the third compound  562  may have a weight % being less than the fourth compound  564 . In the third EML  560 , the third compound  562  may act as a dopant (an emitter), and the fourth compound  564  may act as a host. For example, in the third EML  560 , the third compound  562  has a weight % of about 0.1 to 30. To provide sufficient emitting efficiency and lifespan, the weight % of the third compound  562  may be about 0.1 to 10, or about 1 to 5. 
     The third compound  562  in the third EML  560  and the first compound  522  in the first EML  520  may be same or different, and the fourth compound  564  in the third EML  560  and the second compound  524  in the first EML  520  may be same or different. In addition, the weight % of the first compound  522  in the first EML  520  and the weight % of the third compound  562  in the third EML  560  may be same or different. 
     The second EBL  574  may include the electron blocking material in Formula 9. In addition, the second HBL  576  may include at least one of the hole blocking material in Formula 11 and the hole blocking material in Formula 13. 
     The first CGL  580  is positioned between the first emitting part  530  and the second emitting part  550 , and the second CGL  590  is positioned between the second emitting part  550  and the third emitting part  570 . Namely, the first and second emitting stacks  530  and  550  are connected through the first CGL  580 , and the second and third emitting stacks  550  and  570  are connected through the second CGL  590 . The first CGL  580  may be a P-N junction CGL of a first N-type CGL  582  and a first P-type CGL  584 , and the second CGL  590  may be a P-N junction CGL of a second N-type CGL  592  and a second P-type CGL  594 . 
     In the first CGL  580 , the first N-type CGL  582  is positioned between the first HBL  538  and the second HTL  552 , and the first P-type CGL  584  is positioned between the first N-type CGL  582  and the second HTL  552 . 
     In the second CGL  590 , the second N-type CGL  592  is positioned between the ETL  554  and the third HTL  572 , and the second P-type CGL  594  is positioned between the second N-type CGL  592  and the third HTL  572 . 
     In the OLED D, since each of the first and third EMLs  520  and  560  includes the emitting compound in Formula 1 as the first and third compounds  522  and  562 , respectively, the emitting efficiency and the lifespan of the OLED D and the organic light emitting display device  400  are improved. 
     In addition, the OLED D including the first and third emitting parts  530  and  570  with the second emitting part  550 , which emits yellow-green light or red/green light, can emit white light. 
     In  FIG. 7 , the OLED D has a triple-stack structure of the first, second and third emitting parts  530 ,  550  and  570 . Alternatively, the OLED D may further include additional emitting part and CGL. 
     Referring to  FIG. 5  again, a second electrode  464  is formed over the substrate  410  where the organic emitting layer  462  is formed. 
     In the organic light emitting display device  400 , since the light emitted from the organic emitting layer  462  is incident to the color filter layer  480  through the second electrode  464 , the second electrode  464  has a thin profile for transmitting the light. 
     The first electrode  460 , the organic emitting layer  462  and the second electrode  464  constitute the OLED D. 
     The color filter layer  480  is positioned over the OLED D and includes a red color filter  482 , a green color filter  484  and a blue color filter  486  respectively corresponding to the red, green and blue pixels RP, GP and BP. The red color filter  482  may include at least one of red dye and red pigment, the green color filter  482  may include at least one of green dye and green pigment, and the blue color filter  482  may include at least one of blue dye and blue pigment. 
     Although not shown, the color filter layer  480  may be attached to the OLED D by using an adhesive layer. Alternatively, the color filter layer  480  may be formed directly on the OLED D. 
     An encapsulation film (not shown) may be formed to prevent penetration of moisture into the OLED D. For example, the encapsulation film may include a first inorganic insulating layer, an organic insulating layer and a second inorganic insulating layer sequentially stacked, but it is not limited thereto. The encapsulation film may be omitted. 
     A polarization plate (not shown) for reducing an ambient light reflection may be disposed over the top-emission type OLED D. For example, the polarization plate may be a circular polarization plate. 
     In the OLED of  FIG. 5 , the first and second electrodes  460  and  464  are a reflection electrode and a transparent (or semi-transparent) electrode, respectively, and the color filter layer  480  is disposed over the OLED D. Alternatively, when the first and second electrodes  460  and  464  are a transparent (or semi-transparent) electrode and a reflection electrode, respectively, the color filter layer  480  may be disposed between the OLED D and the first substrate  410 . 
     A color conversion layer (not shown) may be formed between the OLED D and the color filter layer  480 . The color conversion layer may include a red color conversion layer, a green color conversion layer and a blue color conversion layer respectively corresponding to the red, green and blue pixels RP, GP and BP. The white light from the OLED D is converted into the red light, the green light and the blue light by the red, green and blue color conversion layer, respectively. For example, the color conversion layer may include a quantum dot. Accordingly, the color purity of the organic light emitting display device  400  may be further improved. 
     The color conversion layer may be included instead of the color filter layer  480 . 
     As described above, in the organic light emitting display device  400 , the OLED D in the red, green and blue pixels RP, GP and BP emits the white light, and the white light from the organic light emitting diode D passes through the red color filter  482 , the green color filter  484  and the blue color filter  486 . As a result, the red light, the green light and the blue light are provided from the red pixel RP, the green pixel GP and the blue pixel BP, respectively. 
     In  FIGS. 5 to 7 , the OLED D emitting the white light is used for a display device. Alternatively, the OLED D may be formed on an entire surface of a substrate without at least one of the driving element and the color filter layer to be used for a lightening device. The display device and the lightening device each including the OLED D of the present disclosure may be referred to as an organic light emitting device. 
       FIG. 8  is a schematic cross-sectional view illustrating an organic light emitting display device according to a third aspect of the present disclosure. 
     As shown in  FIG. 8 , the organic light emitting display device  600  includes a first substrate  610 , where a red pixel BP, a green pixel GP and a blue pixel BP are defined, a second substrate  670  facing the first substrate  610 , an OLED D, which is positioned between the first and second substrates  610  and  670  and providing white emission, and a color conversion layer  680  between the OLED D and the second substrate  670 . 
     Although not shown, a color filter may be formed between the second substrate  670  and each color conversion layer  680 . 
     Each of the first and second substrates  610  and  670  may be a glass substrate or a flexible substrate. For example, each of the first and second substrates  410  and  470  may be a polyimide (PI) substrate, a polyethersulfone (PES) substrate, a polyethylenenaphthalate (PEN) substrate, a polyethylene terephthalate (PET) substrate or a polycarbonate (PC) substrate. 
     A TFT Tr, which corresponding to each of the red, green and blue pixels RP, GP and BP, is formed on the first substrate  610 , and a passivation layer  650 , which has a drain contact hole  652  exposing an electrode, e.g., a drain electrode, of the TFT Tr is formed to cover the TFT Tr. 
     The OLED D including a first electrode  660 , an organic emitting layer  662  and a second electrode  664  is formed on the passivation layer  650 . In this instance, the first electrode  660  may be connected to the drain electrode of the TFT Tr through the drain contact hole  652 . 
     A bank layer  666  is formed on the passivation layer  650  to cover an edge of the first electrode  660 . Namely, the bank layer  666  is positioned at a boundary of the pixel and exposes a center of the first electrode  460  in the pixel. Since the OLED D emits the blue light in the red, green and blue pixels RP, GP and BP, the organic emitting layer  162  may be formed as a common layer in the red, green and blue pixels RP, GP and BP without separation. The bank layer  466  may be formed to prevent a current leakage at an edge of the first electrode  460  and may be omitted. 
     The OLED D emits a blue light and may have a structure shown in  FIG. 3  or  FIG. 4 . Namely, the OLED D is formed in each of the red, green and blue pixels RP, GP and BP and provides the blue light. 
     The color conversion layer  680  includes a first color conversion layer  682  corresponding to the red pixel RP and a second color conversion layer  684  corresponding to the green pixel GP. For example, the color conversion layer  680  may include an inorganic color conversion material such as a quantum dot. The color conversion layer  680  is not presented in the blue pixel BP such that the OLED D in the blue pixel BP may directly face the second substrate  670 . 
     The blue light from the OLED D is converted into the red light by the first color conversion layer  682  in the red pixel RP, and the blue light from the OLED D is converted into the green light by the second color conversion layer  684  in the green pixel GP. 
     Accordingly, the organic light emitting display device  600  can display a full-color image. 
     On the other hand, when the light from the OLED D passes through the first substrate  610 , the color conversion layer  680  is disposed between the OLED D and the first substrate  610 . 
     It will be apparent to those skilled in the art that various modifications and variations can be made in the aspects of the present disclosure without departing from the spirit or scope of the present disclosure. Thus, it is intended that the modifications and variations cover this disclosure provided they come within the scope of the appended claims and their equivalents.