Patent Publication Number: US-2022216417-A1

Title: Organic light emitting diode and organic light emitting device including the same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application claims the benefit of Korean Patent Application No. 10-2020-0179673 filed in the Republic of Korea on Dec. 21, 2020, which is hereby incorporated by reference in its entirety. 
     BACKGROUND 
     Technical Field 
     The present disclosure relates to an organic light emitting diode (OLED), and more particularly, to an OLED having low driving voltage and high emitting efficiency and lifespan and an organic light emitting device including the OLED. 
     Discussion of the Related Art 
     Recently, requirement for flat panel display devices having small occupied area is increased. Among the flat panel display devices, a technology of an organic light emitting display device, which includes an OLED, is rapidly developed. 
     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 organic emitting layer, combining the electrons with the holes, generating an exciton, and transforming the exciton from an excited state to a ground state. A flexible transparent substrate, for example, a plastic substrate, can be used as a base substrate where elements are formed. In addition, the OLED can be operated at a voltage (e.g., 10V or below) lower than a voltage required to operate other display devices and has low power consumption. Moreover, the light from the OLED has excellent color purity. 
     The OLED may include a first electrode as an anode, a second electrode as cathode facing the first electrode and an organic emitting layer between the first and second electrodes. 
     To improve the emitting efficiency of the OLED, the organic emitting layer may include a hole injection layer (HIL), a hole transporting layer (HTL), an emitting material layer (EML), an electron transporting layer (ETL) and an electron injection layer (EIL) sequentially stacked on the first electrode. 
     In the OLED, the hole from the first electrode as the anode is transferred into the EML through the HIL and the HTL, and the electron from the second electrode as the cathode is transferred into the EML through the EIL and the ETL. The hole and the electron are combined in the EML to form the exciton, and the exciton is transformed from an excited state to a ground state to emit the light. 
     To provide low driving voltage and sufficient emitting efficiency and lifespan of the OLED, sufficient hole injection efficiency and sufficient hole transporting efficiency are required. 
     SUMMARY 
     Accordingly, embodiments of the present disclosure are directed to an OLED and an organic light emitting device that substantially obviate one or more of the problems associated with the limitations and disadvantages of the related conventional art. 
     Additional features and aspects will be set forth in the description that follows, and in part will be apparent from the description, or may be learned by practice of the inventive concepts provided herein. Other features and aspects of the inventive concepts may be realized and attained by the structure particularly pointed out in the written description, or derivable therefrom, and the claims hereof as well as the appended drawings. 
     To achieve these and other aspects of the inventive concepts, as embodied and broadly described herein, an organic light emitting diode comprises a first electrode; a second electrode facing the first electrode; and a first emitting part including a first emitting material layer and a hole injection layer and positioned between the first and second electrodes, wherein the hole injection layer includes a first hole injection material and a second hole injection material and is positioned between the first electrode and the first emitting material layer, wherein the first hole injection material is an organic compound in Formula 1-1: [Formula 1-1] 
     
       
         
         
             
             
         
       
     
     wherein each of R1 and R2 is independently selected from the group consisting of hydrogen (H), deuterium (D), halogen and cyano, wherein each of R3 to R6 is independently selected from the group consisting of halogen, cyano, malononitrile, C1 to C10 haloalkyl group and C1 to C10 haloalkoxy group, and at least one of R3 and R4 and at least one of R5 and R6 are malononitrile, wherein each of X and Y is independently phenyl substituted with at least one of C1 to C10 alkyl group, halogen, cyano, malononitrile, C1 to C10 haloalkyl group and C1 to C10 haloalkoxy group, wherein the second hole injection material include at least one of a first compound in Formula 2 and a second compound in Formula 3: 
     
       
         
         
             
             
         
       
     
     wherein in Formula 2, each of X1 and X2 is independently selected from the group consisting of C6 to C30 aryl group and C5 to C30 heteroaryl group, and L1 is selected from the group consisting of C6 to C30 arylene group and C5 to C30 heteroarylene group, wherein a is 0 or 1, wherein each of R1 to R14 is independently selected from the group consisting of H, D, C1 to C10 alkyl group, C6 to C30 aryl group and C5 to C30 heteroaryl group, or adjacent two of R1 to R14 are connected to each other to form a fused ring, wherein in Formula 3, each of Y1 and Y2 is independently selected from the group consisting of C6 to C30 aryl group and C5 to C30 heteroaryl group, L1 is selected from the group consisting of C6 to C30 arylene group and C5 to C30 heteroarylene group, wherein b is 0 or 1, and wherein each of R21 to R34 is independently selected from the group consisting of H, D, C1 to C10 alkyl group, C6 to C30 aryl group and C5 to C30 heteroaryl group, or adjacent two of R21 to R34 are connected to each other to form a fused ring. 
     In another aspect, an organic light emitting diode comprises a first electrode; a second electrode facing the first electrode; a first emitting part including a first emitting material layer and positioned between the first and second electrodes; a second emitting part including a second emitting material layer and positioned between the first emitting part and the second electrode; and a first p-type charge generation layer including a first charge generation material and a second charge generation material and positioned between the first and second emitting parts, wherein the first charge generation material is an organic compound in Formula 1-1: 
     
       
         
         
             
             
         
       
     
     wherein each of R1 and R2 is independently selected from the group consisting of hydrogen (H), deuterium (D), halogen and cyano, wherein each of R3 to R6 is independently selected from the group consisting of halogen, cyano, malononitrile, C1 to C10 haloalkyl group and C1 to C10 haloalkoxy group, and at least one of R3 and R4 and at least one of R5 and R6 are malononitrile, wherein each of X and Y is independently phenyl substituted with at least one of C1 to C10 alkyl group, halogen, cyano, malononitrile, C1 to C10 haloalkyl group and C1 to C10 haloalkoxy group, wherein the second charge generation material include at least one of a first compound in Formula 2 and a second compound in Formula 3: 
     
       
         
         
             
             
         
       
     
     wherein in Formula 2, each of X1 and X2 is independently selected from the group consisting of C6 to C30 aryl group and C5 to C30 heteroaryl group, and L1 is selected from the group consisting of C6 to C30 arylene group and C5 to C30 heteroarylene group, wherein a is 0 or 1, wherein each of R1 to R14 is independently selected from the group consisting of H, D, C1 to C10 alkyl group, C6 to C30 aryl group and C5 to C30 heteroaryl group, or adjacent two of R1 to R14 are connected to each other to form a fused ring, wherein in Formula 3, each of Y1 and Y2 is independently selected from the group consisting of C6 to C30 aryl group and C5 to C30 heteroaryl group, L1 is selected from the group consisting of C6 to C30 arylene group and C5 to C30 heteroarylene group, wherein b is 0 or 1, and wherein each of R21 to R34 is independently selected from the group consisting of H, D, C1 to C10 alkyl group, C6 to C30 aryl group and C5 to C30 heteroaryl group, or adjacent two of R21 to R34 are connected to each other to form a fused ring. 
     In another aspect, an organic light emitting device comprises a substrate; the above organic light emitting diode positioned on the substrate; and an encapsulation film covering the organic light emitting diode. 
     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 embodiments of the present disclosure and together with the description serve to explain various principles of the present disclosure. 
         FIG. 1  is a schematic circuit diagram of an organic light emitting display device of the present disclosure. 
         FIG. 2  is a schematic cross-sectional view of an organic light emitting device according to a first embodiment of the present disclosure. 
         FIG. 3  is a schematic cross-sectional view of an OLED according to a second embodiment of the present disclosure. 
         FIG. 4  is a schematic cross-sectional view of an organic light emitting device according to a third embodiment of the present disclosure. 
         FIG. 5  is a schematic cross-sectional view of an OLED according to a fourth embodiment of the present disclosure. 
         FIG. 6  is a schematic cross-sectional view of an OLED according to a fifth embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in detail to examples and embodiments of the disclosure, which are illustrated in the accompanying drawings. 
     The present disclosure relates an OLED and an organic light emitting device including the OLED. For example, the organic light emitting device may be an organic light emitting display device or an organic lightening device. As an example, an organic light emitting display device, which is a display device including the OLED of the present disclosure, will be mainly described. 
       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) P, and a power line PL are formed in an organic light 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 P. The pixel P may include a red pixel, a green pixel and a blue pixel. In addition, the pixel P may further include a white 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 into a gate electrode of the driving thin film transistor Td and one electrode of the storage capacitor Cst through the switching thin film transistor Ts. 
     The driving thin film transistor Td is turned on by the data signal applied into the gate electrode so that a current proportional to the data signal is supplied from the power line PL to the OLED D through the driving thin film transistor Tr. 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 charged 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 embodiment 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 disposed on a planarization layer  150  and 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  are 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 planarization 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 planarization 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 oxide. 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 planarization 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  includes an emitting material layer (EML) including a light emitting material and a hole injection layer (HIL) under the EML. In addition, the organic emitting layer  162  may further include at least one of a hole transporting layer (HTL), an electron blocking layer (EBL), a hole blocking layer (HBL), an electron transporting layer (ETL) and an electron injection layer (EIL). 
     As described below, the HIL includes an indacene derivative (e.g., indacene compound) substituted with malononitrile group as a hole injection dopant and a fluorene derivative as a hole injection host. As a result, the hole is efficiently injected and/or transported from the anode into the EML. 
     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), silver (Ag) or their alloy, e.g., Al—Mg alloy (AlMg) or Ag—Mg alloy (MgAg). 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). 
     Namely, one of the first and second electrodes  160  and  164  is a transparent (or semi-transparent) electrode, and the other one of the first and second electrodes  160  and  164  is a reflection electrode. 
     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 color filter layer (not shown). The color filter layer may include a red color filter, a green color filter and a blue color filter respectively corresponding to the red pixel, the green pixel and the blue pixel. The color purity of the organic light emitting display device  100  may be improved by the color filter layer. 
     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 according to a second embodiment. 
     As shown in  FIG. 3 , 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 an EML  240  between the first and second electrodes  160  and  164  and an HIL  210  between the first electrode  160  and the EML  240 . 
     The first electrode  160  is an anode, and the second electrode  164  is a cathode. One of the first and second electrodes  160  and  164  is a transparent electrode (or a semi-transparent electrode), and the other one of the first and second electrodes  160  and  164  is a reflection electrode. 
     The hole is injected and/or transported from the first electrode  160  into the EML  240  through the HIL  210 , and the electron is transported from the second electrode  164  into the EML. 
     The organic emitting layer  162  may further include an HTL  220  between the HIL  210  and the EML  240 . In addition, the organic emitting layer  162  may further include at least one of the EIL  260  between the second electrode  164  and the EML  240  and the ETL  250  between the EML  240  and the EIL  260 . 
     Although not shown, the organic emitting layer  162  may further include at least one of the EBL between the HTL  220  and the EML  240  and the HBL between the ETL  250  and the EML  240 . 
     For example, 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), N,N′-diphenyl-N,N′-bis(1-naphthyl)-1,1′-biphenyl-4,4″-diamine (NPD), 4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP), poly[N,N′-bis(4-butylphenyl)-N,N′-bis(phenyl)-benzidine] (poly-TPD), (poly [(9,9-dioctylfluorenyl-2,7-diyl)-co-(4,4′ -(N-(4-sec-butylphenyl)diphenylamine))] (TFB), di-[4-(N,N-di-p-tolyl-amino)-phenyl]cyclohexane (TAPC), 3,5-di(9H-carbazol-9-yl)-N,N-diphenylaniline (DCDPA), N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine, and N-(biphenyl-4-yl)-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)biphenyl-4-amine, but it is not limited thereto. For example, the HTL  220  may include NPD and may have a thickness of 500 to 1500 Å, preferably 800 to 1200 Å. 
     The EBL may include at least one compound selected from the group consisting of tris(4-carbazoyl-9-yl-phenyl)amine (TCTA), tris[4-(diethylamino)phenyl]amine, N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine, TAPC, 4,4′,4″-tris(3-methylphenylamino)triphenylamine (MTDATA), 1,3-bis(carbazol-9-yl)benzene (mCP), 3,3′-bis(N-carbazolyl)-1,1′-biphenyl (mCBP), copper phthalocyanine (CuPc), N,N′-bis[4-[bis(3-methylphenyl)amino]phenyl]-N,N′-diphenyl-[1,1′-biphenyl]-4,4′-diamine (DNTPD), 1,3,5-tris[4-(diphenylamino)phenyl]benzene (TDAPB), DCDPA, and 2,8-bis(9-phenyl-9H-carbazol-3-yl)dibenzo[b,d]thiophene), but it is not limited thereto. The EBL may have a thickness of 10 to 350 Å, preferably 100 to 200 Å. 
     The HBL may include at least one compound selected from the group consisting of tris-(8-hydroxyquinoline) aluminum (Alq 3 ), 2-biphenyl-4-yl-5-(4-t-butylphenyl)-1,3,4-oxadiazole (PBD), spiro-PBD, lithium quinolate (Liq), 2,2′,2″-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H benzimidazole) (TPBi), bis(2-methyl-8-quinolinolato-N1,O8)-(1,1′-biphenyl-4-olato)aluminum (BAlq), 4,7-diphenyl-1,10-phenanthroline (Bphen), 2,9-bis(naphthalene-2-yl)4,7-diphenyl-1,10-phenanthroline (NBphen), 2,9-dimethyl-4,7-diphenyl-1,10-phenathroline (BCP), 3-(4-biphenyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole (TAZ), 4-(naphthalen-1-yl)-3,5-diphenyl-4H-1,2,4-triazole (NTAZ), 1,3,5-trip-pyrid-3-yl-phenyl)benzene (TpPyPB), 2,4,6-tris(3′-(pyridin-3-yl)biphenyl-3-yl)1,3,5-triazine (TmPPPyTz), Poly[9,9-bis3′-((N,N-dimethyl)-N-ethylammonium)-propyl)-2,7-fluorene]-alt-2,7-(9,9-dioctylfluorene)] (PFNBr), tris(phenylquinoxaline (TPQ), and diphenyl-4-triphenylsilyl-phenylphosphine oxide (TSPO1), but it is not limited thereto. For example, the HBL may have a thickness of 10 to 350 Å, preferably 100 to 200 Å. 
     The ETL  250  may include at least one compound selected from the group consisting of 1,3,5-tri(m-pyridin-3-ylphenyl)benzene (TmPyPB), 2,2′,2″-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H benzimidazole)(TPBi), tris(8-hydroxy-quinolinato)aluminum (Alq 3 ), 2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD), 3-(4-biphenyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole (TAZ), 2-biphenyl-4-yl-4,6-bis-(4′-pyridin-2-yl-biphenyl-4-yl)-[1,3,5]triazine (DPT), and bis(2-methyl-8-quinolinolate)-4-(phenylphenolato)aluminum (BAlq), but it is not limited thereto. For example, the ETL  250  may include an azine-based compound, e.g., TmPyPB, or an imidazole-based compound, e.g., TPBi, and may have a thickness of 50 to 350 Å, preferably 100 to 300 Å. 
     The EIL  260  may include at least one of an alkali metal, e.g., 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. For example, the EIL  260  may have a thickness of 1 to 50 Å, preferably 5 to 20 Å. 
     The EML  240  in the red pixel includes a host and a red dopant, the EML  240  in the green pixel includes a host and a green dopant, and the EML  240  in the blue pixel includes a host and a blue dopant. Each of the red, green and blue dopants may be one of a fluorescent compound, a phosphorescent compound and a delayed fluorescent compound. 
     For example, in the EML  240  in the red pixel, the host may be 4,4′-bis(carbazol-9-yl)biphenyl (CBP), and the red dopant may be selected from the group consisting of bis(1-phenylisoquinoline)acetylacetonate iridium (PIQIr(acac)), bis(1-phenylquinoline)acetylacetonate iridium (PQIr(acac)), tris(1-phenylquinoline)iridium (PQIr), and octaethylporphyrin platinum (PtOEP). The EML  240  in the red pixel may provide the light having a wavelength range (e.g., an emission wavelength range) of about 600 to 650 nm. 
     In the EML  240  in the green pixel, the host may be CBP, and the green dopant may be fac-tris(2-phenylpyridine)iridium (Ir(ppy) 3 ) or tris(8-hydroxyquinolino)aluminum (Alq 3 ). However, it is not limited thereto. The EML  240  in the green pixel may provide the light having a wavelength range of about 510 to 570 nm. 
     In the EML  240  in the blue pixel, the host may be an anthracene derivative, and the blue dopant may be a pyrene derivative. However, it is not limited thereto. For example, the host may be 9,10-di(naphtha-2-yl)anthracene, and the blue dopant may be 1,6-bis(diphenylamino)pyrene. In the EML  240  in the blue pixel, the blue dopant may have a weight % of 0.1 to 20, preferably 1 to 10. The EML  240  in the blue pixel may have a thickness of 50 to 350 Å, preferably 100 to 300 Å and may provide the light having a wavelength range of about 440 to 480 nm. 
     The HIL  210  includes a first hole injection material  212  being an indacene derivative (e.g., an indacene-based organic compound) substituted with malononitrile and a second hole injection material  214  being a fluorene derivative (e.g., a fluorene-based organic compound). A highest occupied molecular orbital (HOMO) energy level of the second hole injection material  214  is higher than that of the first hole injection material  212 . 
     The first hole injection material  212  is represented by Formula 1-1. 
     
       
         
         
             
             
         
       
     
     In Formula 1-1, each of R1 and R2 is independently selected from the group consisting of hydrogen (H), deuterium (D), halogen and cyano. Each of R3 to R6 is independently selected from the group consisting of halogen, cyano, malononitrile, C1 to C10 haloalkyl group and C1 to C10 haloalkoxy group, and at least one of R3 and R4 and at least one of R5 and R6 are malononitrile. Each of X and Y is independently phenyl substituted with at least one of C1 to C10 alkyl group, halogen, cyano, malononitrile, C1 to C10 haloalkyl group and C1 to C10 haloalkoxy group. 
     For example, the C1 to C10 haloalkyl group may be trifluoromethyl, and the C1 to C10 haloalkoxy group may be trifluoromethoxy. In addition, halogen may be one of F, Cl, Br and I. 
     In Formula 1-1, one of R3 and R4 and one of R5 and R6 may be malononitrile, and the other one of R3 and R4 and the other one of R5 and R6 maybe cyano. 
     For example, in Formula 1-1, R3 and R6 may be malononitrile. Alternatively, in Formula 1-1, R4 and R6 may be malononitrile. Namely, the first hole injection material  212  in Formula 1-1 may be represented by Formula 1-2 or 1-3. 
     
       
         
         
             
             
         
       
     
     In Formula 1-1, the substituents at a first side of the indacene core may be different from the substituents at a second side of the indacene core so that the first hole injection material  212  in Formula 1-1 may have an asymmetric structure. 
     For example, each of X and Y may be independently phenyl substituted with at least one of C1 to C10 alkyl group, halogen, cyano, malononitrile, C1 to C10 haloalkyl group and C1 to C10 haloalkoxy group, and X and Y may have a difference in at least one of the substituent and the position of the substituent. Namely, a phenyl moiety being X and a phenyl moiety being Y may have different substituents and/or may have same substituent or different substituents at different positions. 
     For example, the first hole injection material  212  in Formula 1-1 may be represented by Formula 1-4. 
     
       
         
         
             
             
         
       
     
     In Formula 1-4, each of X1 to X3 and each of Y1 to Y3 are independently selected from the group consisting of H, C1 to C10 alkyl group, halogen, cyano, malononitrile, C1 to C10 haloalkyl group and C1 to C10 haloalkoxy group and satisfy at least one of i) X1 and Y1 are different and ii) X2 is different from Y2 and Y3 or X3 is different from Y2 and Y3. 
     The second hole injection material  214  includes at least one of a first compound  216 , where an amine moiety (or an amino group) is combined (connected, linked or joined) to a second position of a fluorene moiety (or a spiro-fluorene moiety) directly or through a linker L1, and a second compound  218 , where an amine moiety is combined to a third position of a fluorene moiety directly or through a linker L1. 
     The HOMO energy level of the first compound  216  is higher than that of the second compound  218 . For example, the HOMO energy level of the first compound  216  may be equal to or higher than −5.50 eV, and the HOMO energy level of the second compound  218  may be lower than −5.50 eV. A difference between the HOMO energy level of the first compound  216  and the HOMO energy level of the second compound  218  may be 0.3 eV or less. 
     The first compound  216  is represented by Formula 2. 
     
       
         
         
             
             
         
       
     
     In Formula 2, each of X1 and X2 is independently selected from the group consisting of C6 to C30 aryl group and C5 to C30 heteroaryl group, L1 is selected from the group consisting of C6 to C30 arylene group and C5 to C30 heteroarylene group, and a is 0 or 1. Each of R1 to R14 is independently selected from the group consisting of H, D, C1 to C10 alkyl group, C6 to C30 aryl group and C5 to C30 heteroaryl group, or adjacent two of R1 to R14 are connected (combined or joined) to each other to form a fused ring. 
     In Formula 2 above and in Formula 3 below, C6 to C30 aryl (or arylene) may be selected from the group consisting of phenyl, biphenyl, terphenyl, naphthyl, anthracenyl, pentanenyl, indenyl, indenoindenyl, heptalenyl, biphenylenyl, indacenyl, phenanthrenyl, benzophenanthrenyl, dibenzophenanthrenyl, azulenyl, pyrenyl, fluoranthenyl, triphenylenyl, chrysenyl, tetraphenyl, tetrasenyl, picenyl, pentaphenyl, pentacenyl, fluorenyl, indenofluorenyl and spiro-fluorenyl. 
     In Formula 2 above and in Formula 3 below, C5 to C30 heteroaryl (or heteroarylene) may be selected from the group consisting of pyrrolyl, pyridinyl, pyrimidinyl, pyrazinyl, pyridazinyl, triazinyl, tetrazinyl, imidazolyl, pyrazolyl, indolyl, isoindolyl, indazolyl, indolizinyl, pyrrolizinyl, carbazolyl, benzocarbazolyl, dibenzocarbazolyl, indolocarbazolyl, indenocarbazolyl, benzofurocarbazolyl, benzothienocarbazolyl, quinolinyl, isoquinolinyl, phthalazinyl, quinoxalinyl, cinnolinyl, quinazolinyl, quinozolinyl, quinolinyl, purinyl, phthalazinyl, quinoxalinyl, benzoquinolinyl, benzoisoquinolinyl, benzoquinazolinyl, benzoquinoxalinyl, acridinyl, phenanthrolinyl, perimidinyl, phenanthridinyl, pteridinyl, cinnolinyl, naphtharidinyl, furanyl, oxazinyl, oxazolyl, oxadiazolyl, triazolyl, dioxynyl, benzofuranyl, dibenzofuranyl, thiopyranyl, xantenyl, chromanyl, isochromanyl, thioazinyl, thiophenyl, benzothiophenyl, dibenzothiophenyl, difuropyrazinyl, benzofurodibenzofuranyl, benzothienobenzothiophenyl, benzothienodibenzothiophenyl, benzothienobenzofuranyl, and benzothienodibenzofuranyl. 
     In Formula 2 above and in Formula 3 below, each of C6 to C30 aryl and C5 to C30 heteroaryl may include substituted one and unsubstituted one. Namely, each of C6 to C30 aryl and C5 to C30 heteroaryl may be unsubstituted or substituted with C1 to C10 alkyl group, e.g., methyl, ethyl or tert-butyl. 
     In Formula 2, X1 and X2 may be same or different. Each of X1 and X2 may be selected from fluorenyl, spiro-fluorenyl, phenyl, biphenyl, terphenyl, tert-butyl phenyl, fluorenylphenyl, carbazolyl and carbazolylphenyl, and L1 may be phenylene. Each of R1 to R14 may be selected from H, D, C1 to C10 alkyl group, e.g., tert-butyl, and C6 to C30 aryl group, e.g., phenyl, and adjacent two of R1 to R14, e.g., R1 and R6, may be connected to form a fused ring. The fused ring may be one of aromatic ring, alicyclic ring and heteroaromatic ring. 
     The second compound  218  is represented by Formula 3. 
     
       
         
         
             
             
         
       
     
     In Formula 3, each of Y1 and Y2 is independently selected from the group consisting of C6 to C30 aryl group and C5 to C30 heteroaryl group, L1 is selected from the group consisting of C6 to C30 arylene group and C5 to C30 heteroarylene group, and b is 0 or 1. Each of R21 to R34 is independently selected from the group consisting of H, D, C1 to C10 alkyl group, C6 to C30 aryl group and C5 to C30 heteroaryl group, or adjacent two of R21 to R34 are connected (combined or joined) to each other to form a fused ring. 
     In Formula 3, Y1 and Y2 may be same or different. Each of Y1 and Y2 may be selected from fluorenyl, spiro-fluorenyl, phenyl, biphenyl, terphenyl, tert-butyl phenyl, fluorenylphenyl, carbazolyl and carbazolylphenyl, and L1 may be phenylene. Each of R21 to R34 may be selected from H, D, C1 to C10 alkyl group, e.g., tert-butyl, and C6 to C30 aryl group, e.g., phenyl, and adjacent two of R21 to R34, e.g., R21 and R26, may be connected to form a fused ring. The fused ring may be one of aromatic ring, alicyclic ring and heteroaromatic ring. 
     In the HIL  210 , a weight % of the first hole injection material  212  may be smaller than that of the second hole injection material  214 . Namely, in the HIL  210 , the second hole injection material  214  may be referred as a host, and the first hole injection material  212  may be referred to as a dopant. For example, in the HIL  210 , the first hole injection material  212  may have a weight % of about 1 to 25, and the second hole injection material  214  may have a weight % of about 75 to 99. 
     In the OLED D of the present disclosure, the HIL  210  includes the first hole injection material  212 , which may be a host, and at least one of the first and second compounds  216  and  218 , each of which may be a dopant, such that the HIL  210  provides excellent hole injection property. As a result, the hole injection efficiency from the first electrode  160  as the anode is improved. 
     In more detail, the hole injection property from the first electrode  160  is improved by the first compound  216  having high HOMO energy level, and the barrier between the HIL  210  and the HTL  220  is reduced by the second compound  218  having low HOMO energy level. 
     When the HIL  210  includes all of the first hole injection material  212 , the first compound  216  and the second compound  218 , a weight % of the first hole injection material  212  may be smaller than that of each of the first and second compounds  216  and  218 . In addition, the weight % of the first compound  216  may be equal to or greater than that of the second compound  218 . For example, a weight % ratio of the first compound  216  to the second compound  218  may be about 5:5 to 6:4. When the weight % of the first compound  216  is smaller than the weight % range of the present disclosure, the hole injection property from the first electrode  160  is degraded. When the weight % of the first compound  216  is greater than the weight % range of the present disclosure, the barrier between adjacent layers, e.g., the HIL  210  and the HTL  220 , is increased such that a hole transporting property is degraded. 
     The first hole injection material  212  in Formula 1-1 may be one of the compounds in Formula 4. 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     The first compound  216  in Formula 2 may be one of the compounds in Formula 5. 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     The second compound  218  in Formula 3 may be one of the compounds in Formula 6. 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     [Synthesis] 
     1. Synthesis of the Compound A04 
     (1) Compound 4-A 
     
       
         
         
             
             
         
       
     
     2,2′-(4,6-dibromo-1,3-phenylene)diacetonitrile (180 g, 573 mmol), toluene (6 L), copperiodide (CuI, 44 mmol), tetrakis(triphenylphosphine)palladium (44 mmol), diisopropylamine (2885 mmol) and 1-ethynyl-4-(trifluoromethyl)benzene (637 mmol) were mixed and heated to 100° C. After the reaction, the solvent (5 L) was distilled off. The mixture was cooled to room temperature and filtered to obtain a solid. After the solid was dissolved in chloroform and extracted with water, magnesium sulfate and acid clay were added and stirred for 1 hour. The mixture was filtered and the solvent was distilled again. The mixture was recrystallized using ethanol to obtain the compound 4-A (104 g). (yield 45%, MS[M+H]+=403) 
     (2) Compound 4-B 
     
       
         
         
             
             
         
       
     
     The compound 4-A (104 g, 258 mmol), toluene (3 L), CuI (21 mmol), tetrakis(triphenylphosphine)palladium (21 mmol), diisopropylamine (1290 mmol) and 1-ethynyl-4-(trifluoromethoxy)benzene (258 mmol) were mixed, heated to 100° C., and stirred for 2 hours. After the reaction, the solvent (2 L) was distilled off. The mixture was cooled to room temperature and filtered to obtain a solid. After the solid was dissolved in chloroform and extracted with water, magnesium sulfate and acid clay were added and stirred for 1 hour. After filtering the mixture, the solvent was distilled again. The mixture was recrystallized using tetrahydrofuran and ethanol to obtain the compound 4-B (39.3 g). (yield 30%, MS[M+H]+=509). 
     (3) Compound 4-C 
     
       
         
         
             
             
         
       
     
     The compound 4-B (39 g, 77 mmol), 1,4-dioxane (520 mL), diphenyl sulfoxide (462 mmol), copperbromide (II) (CuBr(II), 15 mmol), palladium acetate (15 mmol) were mixed, heated to 100° C. , and stirred for 5 hours. After the reaction, the solvent was distilled off. After dissolving the mixture in chloroform, acid clay was added and stirred for 1 hour. After filtering the mixture, the solvent was distilled again. The mixture was reverse-precipitated using hexane to obtain a solid. The solid was recrystallized using tetrahydrofuran and hexane and filtered to obtain the compound 4-C (7 g). (yield 17%, MS[M+H]+=537) 
     (4) Compound A04 
     
       
         
         
             
             
         
       
     
     The compound 4-C (7 g, 13 mmol), dichloromethane (220 mL), and malononitrile (96 mmol) were added and cooled to 0° C. Titanium chloride (IV) (65 mmol) was slowly added and stirred for 1 hour while maintaining at 0° C. Pyridine (97.5 mmol) dissolved in dichloromethane (75 mL) was slowly added into the mixture at 0° C. and stirred for 1 hour. After the reaction was completed, acetic acid (130 mmol) was added and additionally stirred for 30 minutes. After the reaction solution was extracted with water, the organic layer was reverse-precipitated in hexane to obtain a solid. After filtering the solid through acetonitrile, magnesium sulfate and acid clay were added and stirred for 30 minutes. The solution was filtered, recrystallized using acetonitrile and toluene, and washed with toluene. The solid was recrystallized using acetonitrile and tert-butylmethylether and purified by sublimation to obtain the compound A04 (1.6 g). (yield 20%, MS[M+H]+=633) 
     2. Synthesis of the Compound A13 
     (1) Compound 13-A 
     
       
         
         
             
             
         
       
     
     2,2′-(4,6-dibromo-1,3-phenylene)diacetonitrile (200 g, 637 mmol), toluene (6 L), copperiodide (CuI, 51 mmol), tetrakis(triphenylphosphine)palladium (51 mmol), diisopropylamine (3185 mmol) and 1-ethynyl-3,5-bis(trifluoromethyl)benzene (637 mmol) were mixed and heated to 100° C. After the reaction, the solvent (5 L) was distilled off. The mixture was cooled to room temperature and filtered to obtain a solid. After the solid was dissolved in chloroform and extracted with water, magnesium sulfate and acid clay were added and stirred for 1 hour. The mixture was filtered and the solvent was distilled again. The mixture was recrystallized using ethanol to obtain the compound 13-A (105 g). (yield 35%, MS[M+H]+=471) 
     (2) Compound 13-B 
     
       
         
         
             
             
         
       
     
     The compound 13-A (105 g, 223 mmol), toluene (3 L), CuI (18 mmol), tetrakis(triphenylphosphine)palladium (18 mmol), diisopropylamine (1115 mmol) and 4-ethynyl-2-(trifluoromethyl)benzonitrile (223 mmol) were mixed, heated to 100° C., and stirred for 2 hours. After the reaction, the solvent (2 L) was distilled off. The mixture was cooled to room temperature and filtered to obtain a solid. After the solid was dissolved in chloroform and extracted with water, magnesium sulfate and acid clay were added and stirred for 1 hour. After filtering the mixture, the solvent was distilled again. The mixture was recrystallized using tetrahydrofuran and ethanol to obtain the compound 13-B (32.6 g). (yield 25%, MS[M+H]+=586) 
     (3) Compound 13-C 
     
       
         
         
             
             
         
       
     
     The compound 13-B (32 g, 55 mmol), 1,4-dioxane (480 mL), diphenyl sulfoxide (330 mmol), CuBr(II) (11 mmol), palladium acetate (11 mmol) were mixed, heated to 100° C., and stirred for 5 hours. After the reaction, the solvent was distilled off. After dissolving the mixture in chloroform, acid clay was added and stirred for 1 hour. After filtering the mixture, the solvent was distilled again. The mixture was reverse-precipitated using hexane to obtain a solid. The solid was recrystallized using tetrahydrofuran and hexane and filtered to obtain the compound 13-C (5 g). (yield 15%, MS[M+H]+=614) 
     (4) Compound A13 
     
       
         
         
             
             
         
       
     
     The compound 13-C (5 g, 8.2 mmol), dichloromethane (150 mL), and malononitrile (49.2 mmol) were added and cooled to 0° C. Titanium chloride (IV) (41 mmol) was slowly added and stirred for 1 hour while maintaining at 0° C. Pyridine (61.5 mmol) dissolved in dichloromethane (50 mL) was slowly added into the mixture at 0° C. and stirred for 1 hour. After the reaction was completed, acetic acid (82 mmol) was added and additionally stirred for 30 minutes. After the reaction solution was extracted with water, the organic layer was reverse-precipitated in hexane to obtain a solid. After filtering the solid through acetonitrile, magnesium sulfate and acid clay were added and stirred for 30 minutes. The solution was filtered, recrystallized using acetonitrile and toluene, and washed with toluene. The solid was recrystallized using acetonitrile and tert-butylmethylether and purified by sublimation to obtain the compound A13 (1 g). (yield 18%, MS[M+H]+=710) 
     3. Synthesis of the Compound A37 
     (1) Compound 37-A 
     
       
         
         
             
             
         
       
     
     2,2′-(4,6-dibromo-2-fluoro-1,3-phenylene)diacetonitrile (300 g, 903.7 mmol), toluene (9 L), CuI (72.3 mmol), tetrakis(triphenylphosphine)palladium (72.3 mmol), diisopropylamine (4518 mmol) and 1-ethynyl-3,5-bis(trifluoromethyl)benzene (903.7 mmol) were mixed and heated to 100° C. After the reaction, the solvent (8 L) was distilled off. The mixture was cooled to room temperature and filtered to obtain a solid. After the solid was dissolved in chloroform and extracted with water, magnesium sulfate and acid clay were added and stirred for 1 hour. The mixture was filtered and the solvent was distilled again. The mixture was recrystallized using ethanol to obtain the compound 37-A (137 g). (yield 31%, MS[M+H]+=489) 
     (2) Compound 37-B 
     
       
         
         
             
             
         
       
     
     The compound 37-A (137 g, 280 mmol), toluene (4.1 L), CuI (22 mmol), tetrakis(triphenylphosphine)palladium (22 mmol), diisopropylamine (1400 mmol) and 4-ethynyl-2-(trifluoromethyl)benzonitrile (280 mmol) were mixed, heated to 100° C., and stirred for 2 hours. After the reaction, the solvent (3 L) was distilled off. The mixture was cooled to room temperature and filtered to obtain a solid. After the solid was dissolved in chloroform and extracted with water, magnesium sulfate and acid clay were added and stirred for 1 hour. After filtering the mixture, the solvent was distilled again. The mixture was recrystallized using tetrahydrofuran and ethanol to obtain the compound 37-B (33.8 g). (yield 20%, MS[M+H]+=603) 
     (3) Compound 37-C 
     
       
         
         
             
             
         
       
     
     The compound 37-B (33 g, 54.7 mmol), 1,4-dioxane (500 mL), diphenyl sulfoxide (328.2 mmol), CuBr(II) (10.9 mmol), palladium acetate (10.9 mmol) were mixed, heated to 100° C., and stirred for 5 hours. After the reaction, the solvent was distilled off. After dissolving the mixture in chloroform, acid clay was added and stirred for 1 hour. After filtering the mixture, the solvent was distilled again. The mixture was reverse-precipitated using hexane to obtain a solid. The solid was recrystallized using tetrahydrofuran and hexane and filtered to obtain the compound 37-C (4.8 g). (yield 14%, MS[M+H]+=632) 
     (4) Compound 37 
     
       
         
         
             
             
         
       
     
     The compound 37-C (4.8 g, 7.6 mmol), dichloromethane (145 mL), and malononitrile (45.6 mmol) were added and cooled to 0° C. Titanium chloride (IV) (38 mmol) was slowly added and stirred for 1 hour while maintaining at 0° C. Pyridine (57 mmol) dissolved in dichloromethane (48 mL) was slowly added into the mixture at 0° C. and stirred for 1 hour. After the reaction was completed, acetic acid (76 mmol) was added and additionally stirred for 30 minutes. After the reaction solution was extracted with water, the organic layer was reverse-precipitated in hexane to obtain a solid. After filtering the solid through acetonitrile, magnesium sulfate and acid clay were added and stirred for 30 minutes. The solution was filtered, recrystallized using acetonitrile and toluene, and washed with toluene. The solid was recrystallized using acetonitrile and tert-butylmethylether and purified by sublimation to obtain the compound A37 (1.1 g). (yield 20%, MS[M+H]+=728) 
     As described above, in the OLED D of the present disclosure, the HIL  210  includes the first hole injection material  212  being the organic compound in Formula 1-1 and the second hole injection material  214  including at least one of the first compound  216  being the organic compound in Formula 2 and the second compound  218  being the organic compound in Formula 3 such that the hole is efficiently injected and/or transported from the first electrode  160  into the EML  240 . Accordingly, the driving voltage of the OLED D is reduced, and the emitting efficiency and the lifespan of the OLED D are improved. 
       FIG. 4  is a schematic cross-sectional view of an organic light emitting device according to a third embodiment of the present disclosure.  FIG. 5  is a schematic cross-sectional view of an OLED according to a fourth embodiment of the present disclosure, and  FIG. 6  is a schematic cross-sectional view of an OLED according to a fifth embodiment of the present disclosure. 
     As shown in  FIG. 4 , the organic light emitting display device  300  includes a first substrate  310 , where a red pixel BP, a green pixel GP and a blue pixel BP are defined, a second substrate  370  facing the first substrate  310 , an OLED D, which is positioned between the first and second substrates  310  and  370  and providing white emission, and a color filter layer  380  between the OLED D and the second substrate  370 . 
     Each of the first and second substrates  310  and  370  may be a glass substrate or a flexible substrate. For example, each of the first and second substrates  310  and  370  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  320  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  320 . The buffer layer  320  may be omitted. 
     A semiconductor layer  322  is formed on the buffer layer  320 . The semiconductor layer  322  may include an oxide semiconductor material or polycrystalline silicon. 
     A gate insulating layer  324  is formed on the semiconductor layer  322 . The gate insulating layer  324  may be formed of an inorganic insulating material such as silicon oxide or silicon nitride. 
     A gate electrode  330 , which is formed of a conductive material, e.g., metal, is formed on the gate insulating layer  324  to correspond to a center of the semiconductor layer  322 . 
     An interlayer insulating layer  332 , which is formed of an insulating material, is formed on the gate electrode  330 . The interlayer insulating layer  332  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  332  includes first and second contact holes  334  and  336  exposing both sides of the semiconductor layer  322 . The first and second contact holes  334  and  336  are positioned at both sides of the gate electrode  330  to be spaced apart from the gate electrode  330 . 
     A source electrode  340  and a drain electrode  342 , which are formed of a conductive material, e.g., metal, are formed on the interlayer insulating layer  332 . 
     The source electrode  340  and the drain electrode  342  are spaced apart from each other with respect to the gate electrode  330  and respectively contact both sides of the semiconductor layer  322  through the first and second contact holes  334  and  336 . 
     The semiconductor layer  322 , the gate electrode  330 , the source electrode  340  and the drain electrode  342  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 planarization layer  350 , which includes a drain contact hole  352  exposing the drain electrode  342  of the TFT Tr, is formed to cover the TFT Tr. 
     A first electrode  360 , which is connected to the drain electrode  342  of the TFT Tr through the drain contact hole  352 , is separately formed in each pixel and on the planarization layer  350 . The first electrode  360  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. The first electrode  360  may further include a reflection electrode or a reflection layer. For example, the reflection electrode or the reflection layer may be formed of silver (Ag) or aluminum-palladium-copper (APC) alloy. In the top-emission type organic light emitting display device  300 , the first electrode  360  may have a triple-layered structure of ITO/Ag/ITO or ITO/APC/ITO. 
     A bank layer  366  is formed on the planarization layer  350  to cover an edge of the first electrode  360 . Namely, the bank layer  366  is positioned at a boundary of the pixel and exposes a center of the first electrode  360  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  366  may be formed to prevent a current leakage at an edge of the first electrode  360  and may be omitted. 
     An organic emitting layer  362  is formed on the first electrode  360 . 
     Referring to  FIG. 5 , the organic emitting layer  362  includes a first emitting part  410 , which includes a first EML  416  and an HIL  420 , a second emitting part  430 , which includes a second EML  434 , and a charge generation layer (CGL)  450  between the first and second emitting parts  410  and  430 . 
     The CGL  450  is positioned between the first and second emitting parts  410  and  430 , and the first emitting part  410 , the CGL  450  and the second emitting part  430  are sequentially stacked on the first electrode  360 . Namely, the first emitting part  410  is positioned between the first electrode  360  and the CGL  450 , and the second emitting part  430  is positioned between the second electrode  364  and the CGL  450 . 
     In the first emitting part  410 , the HIL  420  is positioned under the first EML  416 . Namely, the HIL  420  is positioned between the first electrode  360  and the first EML  416 . 
     The first emitting part  410  may further include at least one of a first HTL  414  positioned between the HIL  420  and the first EML  416  and a first ETL  418  over the first EML  416 . 
     Although not shown, the first emitting part  410  may further include at least one of an EBL between the first HTL  414  and the first EML  416  and an HBL between the first EML  416  and the first ETL  418 . 
     The second emitting part  430  may further include at least one of an EIL  436  over the second EML  434 . In addition, the second emitting part  430  may further include at least one of a second HTL  432  under the second EML  434  and a second ETL  440  between the second EML  434  and the EIL  436 . 
     Although not shown, the second emitting part  430  may further include at least one of an EBL between the second HTL  432  and the second EML  434  and an HBL between the second EML  434  and the second ETL  440 . 
     One of the first and second EMLs  416  and  434  provides a light having a wavelength range of about 440 to 480 nm, and the other one of the first and second EMLs  416  and  434  provides a light having a wavelength range of about 500 to 550 nm. For example, the first EML  416  may provide the light having a wavelength range of about 440 to 480 nm, and the second EML  434  may provide the light having a wavelength range of about 500 to 550 nm. Alternatively, the second EML  434  may have a double-layered structure of a first layer emitting red light and a second layer emitting green light. In this instance, the first layer emitting the red light may include a host and a red dopant, and the second layer emitting the green light may include a host and a green dopant. 
     In the first EML  416  having the wavelength range of 440 to 480 nm, a host may be an anthracene derivative, and a dopant may be a pyrene derivative. For example, in the first EML  416 , the host may be 9,10-di(naphtha-2-yl)anthracene, and the dopant may be 1,6-bis(diphenylamino)pyrene. In the second EML  434  having the wavelength range of 500 to 550 nm, a host may be carbazole derivative, and the dopant may be iridium derivative (complex). For example, in the second EML  434 , the host may be 4,4′-bis(N-Carbazolyl)-1,1′-biphenyl (CBP), and the dopant may be tris(2-phenylpyridine) Iridium(III) (Ir(ppy) 3 ). 
     The CGL  450  includes an n-type CGL  452  and a p-type CGL  454 . The n-type CGL  452  is positioned between the first ETL  418  and the second HTL  432 , and the p-type CGL  454  is positioned between the n-type CGL  452  and the second HTL  432 . 
     The n-type CGL  452  provides the electron toward the first ETL  418 , and the electron is transferred into the first EML  416  through the first ETL  418 . The p-type CGL  454  provides the hole toward the second HTL  432 , and the hole is transferred into the second EML  434  through the second HTL  432 . As a result, in the OLED D having a two-stack (double-stack) structure, the driving voltage is reduced, and the emitting efficiency is improved. 
     The n-type CGL  452  includes an n-type charge generation material and may have a thickness of 100 to 200 Å. For example, the n-type charge generation material may be selected from the group consisting of tris-(8-hydroxyquinoline) aluminum (Alq3), 2-biphenyl-4-yl-5-(4-t-butylphenyl)-1,3,4-oxadiazole (PBD), spiro-PBD, lithium quinolate (Liq), 1,3,5-tris(N-phenylbenzimidazol-2-yl)benzene (TPBi), bis(2-methyl-8-quinolinolato-N1,O8)-(1,1′-biphenyl-4-olato)aluminum (BAlq), 4,7-diphenyl-1,10-phenanthroline (Bphen), 2,9-bis(naphthalene-2-yl)4,7-diphenyl-1,10-phenanthroline (NBphen), 2,9-dimethyl-4,7-diphenyl-1,10-phenathroline (BCP), 3-(4-biphenyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole (TAZ), 4-(naphthalen-1-yl)-3,5-diphenyl-4H-1,2,4-triazole (NTAZ), 1,3,5-tri(p-pyrid-3-yl-phenyl)benzene (TpPyPB), 2,4,6-tris(3′-(pyridin-3-yl)biphenyl-3-yl)1,3,5-triazine (TmPPPyTz), poly[9,9-bis(3′-((N,N-dimethyl)-N-ethylammonium)-propyl)-2,7-fluorene]-alt-2,7-(9,9-dioctylfluorene)] (PFNBr), tris(phenylquinoxaline (TPQ), and diphenyl-4-triphenylsilyl-phenylphosphine oxide (TSPO1). In one embodiment of the present disclosure, the n-type charge generation material may be phenanthroline derivative, e.g., bathophenanthroline (Bphen). 
     In addition, the n-type CGL  452  may further include an auxiliary n-type charge generation material. For example, the auxiliary n-type charge generation material may be alkali metal, e.g., Li, Cs, K, Rb, Na or Fr, or alkali earth metal, e.g., Be, Mg, Ca, Sr, Ba or Ra. In the n-type CGL  452 , the auxiliary n-type charge generation material may have a weight % of about 0.1 to 20, preferably about 1 to 10. 
     At least one of the HIL  420  and the p-type CGL  454  includes the organic compound in Formula 1-1 and at least one of the organic compound in Formula 2 and the organic compound in Formula 3. For example, the HIL  420  may include a first hole injection material  422  and a second hole injection material  424 . In this instance, the first hole injection material  422  is the organic compound in Formula 1-1, and the second hole injection material  424  includes at least one of a first compound  426  being the organic compound in Formula 2 and a second compound  428  being the organic compound in Formula 3. The p-type CGL  454  may include a first p-type charge generation material  456  and a second p-type charge generation material  457 . In this instance, the first p-type charge generation material  456  is the organic compound in Formula 1-1, and the second p-type charge generation material  457  includes at least one of a third compound  458  being the organic compound in Formula 2 and a fourth compound  459  being the organic compound in Formula 3. 
     The first hole injection material  422  in the HIL  420  and the first p-type charge generation material  456  in the p-type CGL  454  may be same or different. Each of the first and second compounds  426  and  428  in the HIL  420  and each of the third and fourth compounds  458  and  459  in the p-type CGL  454  may be same or different, respectively. 
     In the HIL  420 , a weight % of the first hole injection material  422  may be smaller than that of the second hole injection material  424 . Namely, in the HIL  420 , the second hole injection material  424  may be referred as a host, and the first hole injection material  422  may be referred to as a dopant. For example, in the HIL  420 , the first hole injection material  422  may have a weight % of about 1 to 25, and the second hole injection material  424  may have a weight % of about 75 to 99. 
     When the HIL  420  includes all of the first hole injection material  422 , the first compound  426  and the second compound  428 , a weight % of the first hole injection material  422  may be smaller than that of each of the first and second compounds  426  and  428 . In addition, the weight % of the first compound  426  may be equal to or greater than that of the second compound  428 . For example, a weight % ratio of the first compound  426  to the second compound  428  may be about 5:5 to 6:4. The HIL  420  may have a thickness of about 50 to 200 Å. 
     In the p-type CGL  454 , a weight % of the first p-type charge generation material  456  may be smaller than that of the second p-type charge generation material  457 . Namely, in the p-type CGL  454 , the second p-type charge generation material  457  may be referred as a host, and the first p-type charge generation material  456  may be referred to as a dopant. For example, in the p-type CGL  454 , the first p-type charge generation material  456  may have a weight % of about 1 to 25, and the second p-type charge generation material  457  may have a weight % of about 75 to 99. 
     When the p-type CGL  454  includes all of the first p-type charge generation material  456 , the third compound  458  and the fourth compound  459 , a weight % of the first p-type charge generation material  456  may be smaller than that of each of the third and fourth compounds  458  and  459 . In addition, the weight % of the third compound  458  may be equal to or greater than that of the fourth compound  459 . For example, a weight % ratio of the third compound  458  to the fourth compound  459  may be about 5:5 to 6:4. The p-type CGL  454  may have a thickness of about 100 to 200 Å. 
     When the HIL  420  includes the first hole injection material  422 , the first compound  426  and the second compound  428 , and the p-type CGL  454  includes the first p-type charge generation material  456 , the third compound  458  and the fourth compound  459 , a weight % ratio of the first compound  426  with respect to the second compound  428  in the HIL  420  may be smaller than a weight % ratio of the third compound  458  with respect to the fourth compound  459  in the p-type CGL  454 . For example, the first and second compounds  426  and  428  may have the same weight % in the HIL  420 , and the weight % of the third compound  458  may be greater than that of the fourth compound  459  in the p-type CGL  454 . 
     As described above, the first compound  426  and the third compound  458  being the organic compound in Formula 2 has relatively high HOMO energy level and excellent hole injection property. The HIL  420  has a function injecting the hole from the first electrode  360  as the anode into the first HTL  414 , and the p-type CGL  454  has a function directly injecting the hole into the second emitting part  430 . As a result, a ratio of the third compound  458  being the organic compound in formula 2 in the p-type CGL  454  is relatively high such that the hole injection property of the p-type CGL  454  can be further improved. 
     For example, when the HIL  420  and the p-type CGL  454  respectively include the first hole injection material  422  being the organic compound in Formula 1-1 and the first p-type charge generation material  456  being the organic compound in Formula 1-1, a weight % of the first p-type charge generation material  456  in the p-type CGL  454  may be equal to or greater than that of the first hole injection material  422  in the HIL  420 . 
     The OLED D including the first emitting part  410  having the wavelength range of 440 to 480 nm and the second emitting part  430  having the wavelength range of 500 to 550 nm provides the white emission, and the CGL  450  including the first p-type charge generation material  456  and the second p-type charge generation material  457  is provided between the first and second emitting parts  410  and  430 . As a result, the OLED D has advantages in the driving voltage, the emitting efficiency and the lifespan. 
     Referring to  FIG. 6 , the organic emitting layer  362  includes a first emitting part  510  including a first EML  516  and an HIL  520 , a second emitting part  530  including a second EML  534 , a third emitting part  550  including a third EML  554 , a first CGL  570  between the first and second emitting parts  510  and  530  and a second CGL  580  between the second and third emitting parts  530  and  550 . 
     The first CGL  570  is positioned between the first and second emitting parts  510  and  530 , and the second CGL  580  is positioned between the second and third emitting parts  530  and  550 . Namely, the first emitting part  510 , the first CGL  570 , the second emitting part  530 , the second CGL  580  and the third emitting part  550  are sequentially stacked on the first electrode  360 . In other words, the first emitting part  510  is positioned between the first electrode  360  and the first CGL  570 , the second emitting part  530  is positioned between the first and second CGLs  570  and  580 , and the third emitting part  550  is positioned between the second electrode  364  and the second CGL  580 . 
     In the first emitting part  510 , the HIL  520  is positioned under the first EML  516 . Namely, the HIL  520  is positioned between the first electrode  360  and the first EML  516 . 
     The first emitting part  510  may further include at least one of a first HTL  514  positioned between the HIL  520  and the first EML  516  and a first ETL  518  over the first EML  516 . 
     Although not shown, the first emitting part  510  may further include at least one of an EBL between the first HTL  514  and the first EML  516  and an HBL between the first EML  516  and the first ETL  518 . 
     The second emitting part  530  may further include at least one of a second HTL  532  under the second EML  534  and a second ETL  540  over the second EML  534 . 
     Although not shown, the second emitting part  530  may further include at least one of an EBL between the second HTL  532  and the second EML  534  and an HBL between the second EML  534  and the second ETL  540 . 
     The third emitting part  550  may further include an EIL  556 . In addition, the third emitting part  550  may further include at least one of a third HTL  552  under the third EML  554  and a third ETL  560  between the third EML  554  and the EIL  556 . 
     Although not shown, the third emitting part  550  may further include at least one of an EBL between the third HTL  552  and the third EML  554  and an HBL between the third EML  554  and the third ETL  560 . 
     Each of the first and third EMLs  516  and  554  provides a light having a wavelength range of about 440 to 480 nm, and the second EML  534  provides a light having a wavelength range of about 500 to 550 nm. Alternatively, the second EML  534  may have a double-layered structure of a first layer emitting red light and a second layer emitting green light. In addition, the second EML  534  may have a triple-layered structure of a first layer including a host and a red dopant, a second layer including a host and a yellow-green dopant and a third layer including a host and a green dopant. 
     In each of the first and third EMLs  516  and  554 , a host may be an anthracene derivative, and a dopant may be a pyrene derivative. For example, in each of the first and third EMLs  516  and  554 , the host may be 9,10-di(naphtha-2-yl)anthracene, and the dopant may be 1,6-bis(diphenylamino)pyrene. 
     In the second EML  534 , a host may be carbazole derivative, and the dopant may be iridium derivative (complex). For example, in the second EML  534 , the host may be 4,4′-bis(N-Carbazolyl)-1,1′-biphenyl (CBP), and the dopant may be tris(2-phenylpyridine) Iridium(III) (Ir(ppy) 3 ). 
     The first CGL  570  includes a first n-type CGL  572  and a first p-type CGL  574 . The first n-type CGL  572  is positioned between the first ETL  518  and the second HTL  532 , and the first p-type CGL  574  is positioned between the first n-type CGL  572  and the second HTL  532 . 
     The second CGL  580  includes a second n-type CGL  582  and a second p-type CGL  584 . The second n-type CGL  582  is positioned between the second ETL  540  and the third HTL  552 , and the second p-type CGL  584  is positioned between the second n-type CGL  582  and the third HTL  552 . 
     The first n-type CGL  572  provides the electron toward the first ETL  518 , and the electron is transferred into the first EML  516  through the first ETL  518 . The first p-type CGL  574  provides the hole toward the second HTL  532 , and the hole is transferred into the second EML  534  through the second HTL  532 . 
     The second n-type CGL  582  provides the electron toward the second ETL  540 , and the electron is transferred into the second EML  534  through the second ETL  540 . The second p-type CGL  584  provides the hole toward the third HTL  552 , and the hole is transferred into the third EML  554  through the third HTL  552 . 
     As a result, in the OLED D having a three-stack (triple-stack) structure, the driving voltage is reduced, and the emitting efficiency is improved. 
     Each of the first and second n-type CGLs  572  and  582  includes an n-type charge generation material and may have a thickness of 100 to 200 Å. For example, the n-type charge generation material may be Bphen. In addition, each of the first and second n-type CGLs  572  and  582  may further include an auxiliary n-type charge generation material. For example, the auxiliary n-type charge generation material may be alkali metal or alkali earth metal. 
     At least one of the HIL  520 , the first p-type CGL  574  and the second p-type CGL  584  includes the organic compound in Formula 1-1 and at least one of the organic compound in Formula 2 and the organic compound in Formula 3. For example, the HIL  520  may include a first hole injection material  522  and a second hole injection material  524 . In this instance, the first hole injection material  522  is the organic compound in Formula 1-1, and the second hole injection material  524  includes at least one of a first compound  526  being the organic compound in Formula 2 and a second compound  528  being the organic compound in Formula 3. The first p-type CGL  574  may include a first p-type charge generation material  576  and a second p-type charge generation material  577 . In this instance, the first p-type charge generation material  576  is the organic compound in Formula 1-1, and the second p-type charge generation material  577  includes at least one of a third compound  578  being the organic compound in Formula 2 and a fourth compound  579  being the organic compound in Formula 3. The second p-type CGL  584  may include a third p-type charge generation material  586  and a fourth p-type charge generation material  587 . In this instance, the third p-type charge generation material  586  is the organic compound in Formula 1-1, and the fourth p-type charge generation material  587  includes at least one of a fifth compound  588  being the organic compound in Formula 2 and a sixth compound  589  being the organic compound in Formula 3. 
     The first hole injection material  522  in the HIL  520 , and the first p-type charge generation material  576  in the first p-type CGL  574 , and the third p-type charge generation material  586  in the second p-type CGL  584  may be same or different. Each of the first and second compounds  526  and  528  in the HIL  520  and each of the third and fourth compounds  578  and  579  in the first p-type CGL  574  may be same or different, respectively. Each of the first and second compounds  526  and  528  in the HIL  520  and each of the fifth and sixth compounds  588  and  589  in the second p-type CGL  584  may be same or different, respectively. Each of the third and fourth compounds  578  and  579  in the first p-type CGL  574  and each of the fifth and sixth compounds  588  and  589  in the second p-type CGL  584  may be same or different, respectively. 
     In the HIL  520 , a weight % of the first hole injection material  522  may be smaller than that of the second hole injection material  524 . Namely, in the HIL  520 , the second hole injection material  524  may be referred as a host, and the first hole injection material  522  may be referred to as a dopant. For example, in the HIL  520 , the first hole injection material  522  may have a weight % of about 1 to 25, and the second hole injection material  524  may have a weight % of about 75 to 99. 
     When the HIL  520  includes all of the first hole injection material  522 , the first compound  526  and the second compound  528 , a weight % of the first hole injection material  522  may be smaller than that of each of the first and second compounds  526  and  528 . In addition, the weight % of the first compound  526  may be equal to or greater than that of the second compound  528 . For example, a weight % ratio of the first compound  526  to the second compound  528  may be about 5:5 to 6:4. The HIL  520  may have a thickness of about 50 to 200 Å. 
     In the first p-type CGL  574 , a weight % of the first p-type charge generation material  576  may be smaller than that of the second p-type charge generation material  577 . Namely, in the first p-type CGL  574 , the second p-type charge generation material  577  may be referred as a host, and the first p-type charge generation material  576  may be referred to as a dopant. For example, in the first p-type CGL  574 , the first p-type charge generation material  576  may have a weight % of about 1 to 25, and the second p-type charge generation material  577  may have a weight % of about 75 to 99. 
     When the first p-type CGL  574  includes all of the first p-type charge generation material  576 , the third compound  578  and the fourth compound  579 , a weight % of the first p-type charge generation material  576  may be smaller than that of each of the third and fourth compounds  578  and  579 . In addition, the weight % of the third compound  578  may be equal to or greater than that of the fourth compound  579 . For example, a weight % ratio of the third compound  578  to the fourth compound  579  may be about 5:5 to 6:4. The first p-type CGL  574  may have a thickness of about 100 to 200 Å. 
     In the second p-type CGL  584 , a weight % of the third p-type charge generation material  586  may be smaller than that of the fourth p-type charge generation material  587 . Namely, in the second p-type CGL  584 , the fourth p-type charge generation material  587  may be referred as a host, and the third p-type charge generation material  586  may be referred to as a dopant. For example, in the second p-type CGL  584 , the third p-type charge generation material  586  may have a weight % of about 1 to 25, and the fourth p-type charge generation material  587  may have a weight % of about 75 to 99. 
     When the second p-type CGL  584  includes all of the third p-type charge generation material  586 , the fifth compound  588  and the sixth compound  589 , a weight % of the third p-type charge generation material  586  may be smaller than that of each of the fifth and sixth compounds  588  and  589 . In addition, the weight % of the fifth compound  588  may be equal to or greater than that of the sixth compound  589 . For example, a weight % ratio of the fifth compound  588  to the sixth compound  589  may be about 5:5 to 6:4. The second p-type CGL  584  may have a thickness of about 100 to 200 Å. 
     When the HIL  520  includes the first hole injection material  522 , the first compound  526  and the second compound  528 , the first p-type CGL  574  includes the first p-type charge generation material  576 , the third compound  578  and the fourth compound  579 , and the second p-type CGL  584  includes the third p-type charge generation material  586 , the fifth compound  588  and the sixth compound  589 , a weight % ratio of the first compound  726  with respect to the second compound  528  in the HIL  520  may be smaller than each of a weight % ratio of the third compound  578  with respect to the fourth compound  579  in the first p-type CGL  574  and a weight % ratio of the fifth compound  588  with respect to the sixth compound  589  in the second p-type CGL  584 . For example, the first and second compounds  526  and  528  may have the same weight % in the HIL  520 , the weight % of the third compound  578  may be greater than that of the fourth compound  579  in the first p-type CGL  574 , and the weight % of the fifth compound  588  may be greater than that of the sixth compound  589  in the second p-type CGL  584 . 
     For example, when the HIL  520 , the first p-type CGL  574  and the second p-type CGL  584  respectively include the first hole injection material  522  being the organic compound in Formula 1-1, the first p-type charge generation material  576  being the organic compound in Formula 1-1 and the third p-type charge generation material  586  being the organic compound in Formula 1-1, a weight % of each of the first and third p-type charge generation materials  576  and  586  in the first and second p-type CGLs  574  and  584  may be equal to or greater than that of the first hole injection material  522  in the HIL  520 . 
     The OLED D including the first and third emitting parts  510  and  550  having the wavelength range of 440 to 480 nm and the second emitting part  430  having the wavelength range of 500 to 550 nm provides the white emission. In addition, the first CGL  570  including the first p-type charge generation material  576  and the second p-type charge generation material  577  is provided between the first and second emitting parts  510  and  530 , and the second CGL  580  including the third p-type charge generation material  586  and the fourth p-type charge generation material  587  is provided between the second and third emitting parts  530  and  550 . As a result, the OLED D has advantages in the driving voltage, the emitting efficiency and the lifespan. 
     Referring  FIG. 4 , a second electrode  364  is formed over the first substrate  310  where the organic emitting layer  362  is formed. 
     In the organic light emitting display device  300 , since the light emitted from the organic emitting layer  362  is incident to the color filter layer  380  through the second electrode  364 , the second electrode  364  has a thin profile for transmitting the light. 
     The first electrode  360 , the organic emitting layer  362  and the second electrode  364  constitute the OLED D. 
     The color filter layer  380  is positioned over the OLED D and includes a red color filter  382 , a green color filter  384  and a blue color filter  386  respectively corresponding to the red, green and blue pixels RP, GP and BP. The red color filter  382  may include at least one of red dye and red pigment, the green color filter  384  may include at least one of green dye and green pigment, and the blue color filter  386  may include at least one of blue dye and blue pigment. 
     Although not shown, the color filter layer  380  may be attached to the OLED D by using an adhesive layer. Alternatively, the color filter layer  380  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. 4 , the first and second electrodes  360  and  364  are a reflection electrode and a transparent (or semi-transparent) electrode, respectively, and the color filter layer  380  is disposed over the OLED D. Alternatively, when the first and second electrodes  360  and  364  are a transparent (or semi-transparent) electrode and a reflection electrode, respectively, the color filter layer  380  may be disposed between the OLED D and the first substrate  310 . 
     A color conversion layer (not shown) may be formed between the OLED D and the color filter layer  380 . 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  300  may be further improved. 
     The color conversion layer may be included instead of the color filter layer  380 . 
     As described above, in the organic light emitting display device  300 , 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  382 , the green color filter  384  and the blue color filter  386 . 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  FIG. 4 , 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. 
     In the OLED D and the organic light emitting display device  300 , at least one of the HIL and the p-type CGL includes the organic compound in Formula 1-1 and at least one of the organic compound in Formula 2 and the organic compound in Formula 3 such that the hole injection/transporting property toward the EML is improved. Accordingly, in the OLED D and the organic light emitting display device  300 , the driving voltage is decreased, and the emitting efficiency and the lifespan are improved. 
     [OLED1] 
     On the anode (ITO), the HIL (HIL, 100 Å, NPD+HATCN(10 wt %)), the first HTL (HTL1, 1000 Å, NPD), the first EML (EML1, 200 Å, the host (9,10-di(naphtha-2-yl)anthracene) and the dopant (1,6-bis(diphenylamino)pyrene, 3 wt %), the first ETL (ETL1, 200 Å, 1,3,5-tri(m-pyridin-3-ylphenyl)benzene(TmPyPB)), the n-type CGL (N-CGL, 150 Å, Bphen+Li (2 wt %)), the p-type CGL (P-CGL, 150 Å), the second HTL (HTL2, 300 Å, NPD), the second EML (EML2, 250 Å, the host (CBP) and the dopant (Ir(ppy) 3 , 8 wt %)), the second ETL (ETL2, 220 Å, 2,2′,2″-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H benzimidazole) (TPBi)), the EIL (LiF, 10 Å) and the cathode (Al, 1500 Å) were sequentially deposited to form the OLED. 
     1. COMPARATIVE EXAMPLES 
     (1) Comparative Example 1 (Ref1) 
     The p-type CGL is formed by using NPD and HATCN (20 wt %). 
     (2) Comparative Example 2 (Ref2) 
     The p-type CGL is formed by using the compound H1-1 in Formula 5 and HATCN (20 wt %). 
     (3) Comparative Example 3 (Ref3) 
     The p-type CGL is formed by using the compound H2-8 in Formula 6 and HATCN (20 wt %). 
     (3) Comparative Example 3 (Ref3) 
     The p-type CGL is formed by using the compound H1-1 (40 wt %) in Formula 5, the compound H2-8 (40 wt %) in Formula 6 and HATCN (20 wt %). 
     2. EXAMPLES 
     (1) Example 1 (Ex1) 
     The p-type CGL is formed by using the compound H1-1 in Formula 5 and the compound S07 (20 wt %) in Formula 4. 
     (2) Example 2 (Ex2) 
     The p-type CGL is formed by using the compound H2-8 in Formula 5 and the compound S07 (20 wt %) in Formula 4. 
     (3) Example 3 (Ex3) 
     The p-type CGL is formed by using the compound H1-1 (40 wt %) in Formula 5, the compound H2-8 (40 wt %) in Formula  6  and the compound S07 (20 wt %) in Formula 4. 
     (4) Example 4 (Ex4) 
     The p-type CGL is formed by using the compound H1-1 in Formula 5 and the compound S20 (20 wt %) in Formula 4. 
     (5) Example 5 (Ex5) 
     The p-type CGL is formed by using the compound H2-8 in Formula 5 and the compound S20 (20 wt %) in Formula 4. 
     (6) Example 6 (Ex6) 
     The p-type CGL is formed by using the compound H1-1 (40 wt %) in Formula 5, the compound H2-8 (40 wt %) in Formula  6  and the compound S20 (20 wt %) in Formula 4. 
     (7) Example 7 (Ex7) 
     The p-type CGL is formed by using the compound H1-1 in Formula 5 and the compound A13 (20 wt %) in Formula 4. 
     (8) Example 9 (Ex9) 
     The p-type CGL is formed by using the compound H2-8 in Formula 5 and the compound A13 (20 wt %) in Formula 4. 
     (9) Example 9 (Ex9) 
     The p-type CGL is formed by using the compound H1-1 (40 wt %) in Formula 5, the compound H2-8 (40 wt %) in Formula 6 and the compound A13 (20 wt %) in Formula 4. 
     (10) Example 10 (Ex10) 
     The p-type CGL is formed by using the compound H1-15 (40 wt %) in Formula 5, the compound H2-1 (40 wt %) in Formula 6 and the compound A13 (20 wt %) in Formula 4. 
     In the OLEDs of Comparative Examples 1 to 4 (Ref1 to Ref4) and Examples 1 to 10 (Ex1 to Ex10), the properties, i.e., the driving voltage (V), the efficiency (Cd/A), and the lifespan (hr), are measured and listed in Table 1. The HOMO energy level and the LUMO energy level of the organic compounds used in the p-type CGL are measured and listed in Table 2. 
     
       
         
           
               
               
               
               
               
             
               
                 TABLE 1 
               
             
            
               
                   
               
               
                   
                 P-CGL 
                   
                   
                 Lifespan 
               
            
           
           
               
               
               
               
               
               
               
            
               
                   
                 D 
                 H1 
                 H2 
                 V 
                 Cd/A 
                 [hr] 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Ref1 
                 HATCN 
                 NPD 
                 — 
                 11.53 
                 40.15 
                 70 
               
               
                 Ref2 
                 HATCN 
                 H1-1 
                 — 
                 11.40 
                 40.52 
                 72 
               
               
                 Ref3 
                 HATCN 
                 — 
                 H2-8 
                 12.05 
                 39.57 
                 64 
               
               
                 Ref4 
                 HATCN 
                 H1-1 
                 H2-8 
                 11.36 
                 41.20 
                 80 
               
               
                 Ex1 
                 S07 
                 H1-1 
                 — 
                 8.94 
                 50.64 
                 164 
               
               
                 Ex2 
                 S07 
                 — 
                 H2-8 
                 9.02 
                 50.18 
                 153 
               
               
                 Ex3 
                 S07 
                 H1-1 
                 H2-8 
                 8.83 
                 51.25 
                 175 
               
               
                 Ex4 
                 S20 
                 H1-1 
                 — 
                 8.70 
                 52.32 
                 184 
               
               
                 Ex5 
                 S20 
                 — 
                 H2-8 
                 8.76 
                 51.77 
                 180 
               
               
                 Ex6 
                 S20 
                 H1-1 
                 H2-8 
                 8.63 
                 52.95 
                 190 
               
               
                 Ex7 
                 A13 
                 H1-1 
                 — 
                 8.49 
                 53.51 
                 192 
               
               
                 Ex8 
                 A13 
                 — 
                 H2-8 
                 8.52 
                 53.24 
                 188 
               
               
                 Ex9 
                 A13 
                 H1-1 
                 H2-8 
                 8.36 
                 55.98 
                 215 
               
               
                 Ex10 
                 A13 
                 H1-15 
                 H2-1 
                 8.31 
                 56.49 
                 226 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
               
             
               
                   
                 TABLE 2 
               
               
                   
                   
               
               
                   
                   
                 HOMO (eV) 
                 LUMO (eV) 
               
               
                   
                   
               
             
            
               
                   
                 HATCN 
                 −8.55 
                 −6.07 
               
               
                   
                 S07 
                 −8.21 
                 −6.34 
               
               
                   
                 S20 
                 −8.27 
                 −6.46 
               
               
                   
                 A13 
                 −8.22 
                 −6.32 
               
               
                   
                 NPD 
                 −5.45 
                 −2.18 
               
               
                   
                 H1-1 
                 −5.46 
                 −2.19 
               
               
                   
                 H1-15 
                 −5.38 
                 −2.12 
               
               
                   
                 H2-1 
                 −5.51 
                 −2.25 
               
               
                   
                 H2-8 
                 −5.59 
                 −2.28 
               
               
                   
                 H2-21 
                 −5.56 
                 −2.27 
               
               
                   
                   
               
            
           
         
       
     
     As shown in Table 1, in comparison to the OLED of Ref1, where NPD and HATCN are used to form the p-type CGL, the OLEDs of Ref2 to Ref5, where the organic compound in Formula 2 and/or the organic compound in Formula 3 are used with HAT-CN to form the p-type CGL, still have a limitation in the driving voltage, the emitting efficiency and the lifespan. Namely, even though the organic compound in Formula 2 and/or the organic compound in Formula 3 are used in the p-type CGL, the energy level of the organic compound and HATCN (e.g., a dopant) is not matched such that there is a limitation in the properties of the OLEDs of Ref2 to Ref4. 
     On the other hand, in the OLEDs of Ex1 to Ex10, where the compound in Formula 1-1, i.e., the compound S07, the compound S20 or the compound A13 and at least one of the compound in Formula 2, i.e., the compound H1-1 or the compound H1-15, and the compound in Formula 3, i.e., the compound H2-1 or the compound H2-8, are included in the p-type CGL, the driving voltage is significantly decreased, and the emitting efficiency and the lifespan are significantly increased. 
     In addition, in the OLEDs of Ex3, Ex6, Ex9 and Ex10, where the compound in Formula 2 and the compound in Formula 3 with the compound in Formula 1-1 are included in the p-type CGL, the driving voltage is further decreased, and the emitting efficiency and the lifespan are further increased. Moreover, in the OLEDs of Ex 7 to Ex10, where the indacene derivative having an asymmetric structure is included in the p-type CGL, the driving voltage is remarkably decreased, and the emitting efficiency and the lifespan are remarkably increased. 
     [OLED2] 
     On the anode (ITO), the HIL (HIL, 100 Å), the HTL (HTL, 1000 Å, NPD), the EML (EML, 200 Å, the host (9,10-di(naphtha-2-yl)anthracene) and the dopant (1,6-bis(diphenylamino)pyrene, 3 wt %), the ETL (ETL, 200 Å, TmPyPB), the EIL (LiF, 10 Å) and the cathode (Al, 1500 Å) were sequentially deposited to form the OLED. 
     3. COMPARATIVE EXAMPLES 
     (1) Comparative Example 5 (Ref5) 
     The HIL is formed by using NPD and HATCN (20 wt %). 
     (2) Comparative Example 6 (Ref6) 
     The HIL is formed by using the compound H1-1 in Formula 5 and HATCN (20 wt %). 
     (3) Comparative Example 7 (Ref7) 
     The HIL is formed by using the compound H2-8 in Formula 6 and HATCN (20 wt %). 
     (3) Comparative Example 8 (Ref8) 
     The HIL is formed by using the compound H1-1 (40 wt %) in Formula 5, the compound H2-8 (40 wt %) in Formula 6 and HATCN (20 wt %). 
     4. EXAMPLES 
     (1) Example 11 (Ex11) 
     The HIL is formed by using the compound H1-1 in Formula 5 and the compound A13 (20 wt %) in Formula 4. 
     (2) Example 12 (Ex12) 
     The HIL is formed by using the compound H2-8 in Formula 5 and the compound A13 (20 wt %) in Formula 4. 
     (3) Example 13 (Ex13) 
     The HIL is formed by using the compound H1-1 (40 wt %) in Formula 5, the compound H2-8 (40 wt %) in Formula 5 and the compound A13 (20 wt %) in Formula 4. 
     (4) Example 14 (Ex14) 
     The HIL is formed by using the compound H1-15 (40 wt %) in Formula 5, the compound H2-1 (40 wt %) in Formula 5 and the compound A13 (20 wt %) in Formula 4. 
     In the OLEDs of Comparative Examples 5 to 8 (Ref5 to Ref8) and Examples 11 to 14 (Ex11 to Ex14), the properties, i.e., the driving voltage (V), the efficiency (Cd/A), and the lifespan (hr), are measured and listed in Table 3. 
     
       
         
           
               
               
               
               
               
             
               
                 TABLE 3 
               
             
            
               
                   
               
               
                   
                 HIL 
                   
                   
                 Lifespan 
               
            
           
           
               
               
               
               
               
               
               
            
               
                   
                 D 
                 H1 
                 H2 
                 V 
                 Cd/A 
                 [hr] 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Ref5 
                 HATCN 
                 NPD 
                 — 
                 11.53 
                 40.15 
                 70 
               
               
                 Ref6 
                 HATCN 
                 H1-1 
                 — 
                 11.47 
                 40.34 
                 68 
               
               
                 Ref7 
                 HATCN 
                 — 
                 H2-8 
                 12.12 
                 39.26 
                 62 
               
               
                 Ref8 
                 HATCN 
                 H1-1 
                 H2-8 
                 11.42 
                 40.17 
                 74 
               
               
                 Ex11 
                 A13 
                 H1-1 
                 — 
                 8.56 
                 53.04 
                 185 
               
               
                 Ex12 
                 A13 
                 — 
                 H2-8 
                 8.63 
                 52.89 
                 180 
               
               
                 Ex13 
                 A13 
                 H1-1 
                 H2-8 
                 8.41 
                 55.10 
                 206 
               
               
                 Ex14 
                 A13 
                 H1-15 
                 H2-1 
                 8.35 
                 55.76 
                 218 
               
               
                   
               
            
           
         
       
     
     As shown in Table 3, in comparison to the OLEDs of Ref4 to Ref8, in the OLEDs of Ex11 to Ex14, where the compound in Formula 1-1, i.e., the compound A13, and at least one of the compound in Formula 2, i.e., the compound H1-1 or the compound H1-15, and the compound in Formula 3, i.e., the compound H2-1 or the compound H2-8, are included in the p-type CGL, the driving voltage is significantly decreased, and the emitting efficiency and the lifespan are significantly increased. 
     In addition, in the OLEDs of Ex13 and Ex14, where the compound in Formula 2 and the compound in Formula 3 with the compound in Formula 1-1 are included in the p-type CGL, the driving voltage is further decreased, and the emitting efficiency and the lifespan are further increased. 
     It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present disclosure without departing from the spirit or scope of the present disclosure. Thus, it is intended that the modifications and variations are covered in this disclosure provided they come within the scope of the appended claims and their equivalents.