Organic light emitting diode and organic light emitting device comprising the same

Abstract

An organic light emitting diode and an organic light emitting device including the same are disclosed. The organic light emitting diode includes a first electrode, a second electrode facing the first electrode, a first light emitting material layer between the first electrode and the second electrode, and a first intermediate organic layer between the first light emitting material layer and the second electrode and including a first organic layer and a second organic layer between the first organic layer and the second electrode, wherein the first organic layer comprises a first compound represented by Formula 1-1: [Formula 1-1]

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit and priority of Korean Patent Application No. 10-2021-0178382, filed on December 14, 2021 in the Republic of Korea, which is incorporated herein by reference in its entirety. Technical Field

[0003] This disclosure relates to organic light-emitting diodes, and more particularly, to organic light-emitting diodes having low drive voltage, high luminous efficiency and long lifetime, and organic light-emitting devices including said organic light-emitting diodes. Background Technology

[0004] Recently, there has been an increased demand for flat panel display devices with a small footprint. Among flat panel display devices, organic light-emitting diode (OLED) and organic electroluminescent devices (OLEDs) technologies are developing rapidly.

[0005] OLEDs emit light by injecting electrons from the cathode (which acts as the electron injection electrode) and holes from the anode (which acts as the hole injection electrode) into the light-emitting material layer, causing the electrons and holes to combine, generate excitons, and transition the excitons from the excited state to the ground state.

[0006] The related OLED technology suffers from increased power consumption and reduced lifespan due to high driving voltage. Summary of the Invention

[0007] Therefore, some embodiments of this disclosure relate to OLEDs and organic light-emitting devices, which substantially eliminate one or more of the problems associated with the limitations and disadvantages of related technologies.

[0008] One object of this disclosure is to provide OLEDs and organic light-emitting devices with low driving voltage, high luminous efficiency and long lifetime.

[0009] Further features and aspects will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practicing the present disclosure as provided herein. Other features and aspects of the present disclosure may be realized and obtained by means of structures particularly pointed out in or derived from the draft specification, its claims, and the accompanying drawings.

[0010] To achieve these and other advantages and in accordance with the purposes of this disclosure, as described herein, one aspect of this disclosure is an organic light-emitting diode (OLED) comprising: a first electrode; a second electrode facing the first electrode; a first light-emitting material layer between the first electrode and the second electrode; and a first intermediate organic layer between the first light-emitting material layer and the second electrode and comprising a first organic layer and a second organic layer between the first organic layer and the second electrode, wherein the first organic layer comprises a first compound represented by Formula 1-1:

[0011] [Equation 1-1] Ar1 and Ar2 are each independently selected from substituted or unsubstituted C6 to C50 aryl and substituted or unsubstituted C5 to C50 heteroaryl, and R1 to R6 are each independently selected from hydrogen, deuterium, substituted or unsubstituted C1 to C10 alkyl, substituted or unsubstituted C6 to C30 aryl and substituted or unsubstituted C5 to C30 heteroaryl.

[0012] In another aspect of this disclosure, an organic light-emitting device includes: a substrate; and an organic light-emitting diode positioned above the substrate, the organic light-emitting diode including: a first electrode; a second electrode facing the first electrode; a first light-emitting material layer between the first electrode and the second electrode; and a first intermediate organic layer, the first intermediate organic layer being between the first light-emitting material layer and the second electrode and including a first organic layer and a second organic layer between the first organic layer and the second electrode, wherein the first organic layer comprises a first compound represented by Formula 1-1:

[0013] [Equation 1-1] Ar1 and Ar2 are each independently selected from substituted or unsubstituted C6 to C50 aryl and substituted or unsubstituted C5 to C50 heteroaryl, and R1 to R6 are each independently selected from hydrogen, deuterium, substituted or unsubstituted C1 to C10 alkyl, substituted or unsubstituted C6 to C30 aryl and substituted or unsubstituted C5 to C30 heteroaryl.

[0014] It should be understood that the foregoing general description and the following detailed description are merely examples and are intended to provide further illustration of the claimed inventive concept. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of this disclosure and are incorporated into and constitute a part of this application, illustrate embodiments of this disclosure and, together with the description, serve to illustrate the principles of this disclosure.

[0016] Figure 1 This is a schematic circuit diagram of the organic light-emitting display device disclosed herein.

[0017] Figure 2 This is a schematic cross-sectional view of an organic light-emitting display device according to a first embodiment of the present disclosure.

[0018] Figure 3 This is a schematic cross-sectional view of an OLED according to a second embodiment of the present disclosure.

[0019] Figure 4 This is a schematic cross-sectional view of an OLED according to a third embodiment of the present disclosure.

[0020] Figure 5 This is a schematic cross-sectional view of an organic light-emitting display device according to the fourth embodiment of this disclosure.

[0021] Figure 6 This is a schematic cross-sectional view of an OLED according to the fifth embodiment of this disclosure.

[0022] Figure 7 This is a schematic cross-sectional view of an OLED according to the sixth embodiment of this disclosure. Detailed Implementation

[0023] Reference will now be made in detail to some examples and embodiments of this disclosure illustrated in the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings to indicate the same or similar parts.

[0024] This disclosure provides OLEDs and organic light-emitting devices. For example, an organic light-emitting device can be an organic light-emitting display device or an organic light-emitting lighting device. The following explanation focuses on organic light-emitting display devices that include the OLED.

[0025] Figure 1 This is a schematic circuit diagram of the organic light-emitting display device disclosed herein.

[0026] like Figure 1 As shown, the organic light-emitting display device includes a gate line GL, a data line DL, a power line PL, a switching thin-film transistor (TFT) Ts, a driving TFT Td, a storage capacitor Cst, and an OLED D. The gate line GL and the data line DL intersect each other to define a pixel region P. The pixel region may include a red pixel region, a green pixel region, and a blue pixel region.

[0027] The switching TFT Ts is connected to the gate line GL and the data line DL, while the driving TFT Td and the storage capacitor Cst are connected to the switching TFT Ts and the power line PL. The OLED D is connected to the driving TFT Td.

[0028] In an organic light-emitting display device, when the switch TFT Ts is turned on by a gate signal applied via the gate line GL, a data signal from the data line DL is applied to the gate electrode of the driving TFT Td and one electrode of the storage capacitor Cst.

[0029] When the driving TFT Td is turned on by a data signal, current is supplied from the power line PL to the OLED D. As a result, the OLED D emits light. In this case, when the driving TFT Td is turned on, the level of current applied from the power line PL to the OLED D is determined so that the OLED D can produce grayscale levels.

[0030] The storage capacitor Cst is used to maintain the voltage of the gate electrode of the driving TFT Td when the switching TFT Ts is off. Therefore, even if the switching TFT Ts is off, the level of current applied from the power line PL to the OLED D is maintained until the next frame.

[0031] As a result, the organic light-emitting display device displays the desired image.

[0032] Figure 2 This is a schematic cross-sectional view of an organic light-emitting display device according to a first embodiment of the present disclosure.

[0033] like Figure 2 As shown, the organic light-emitting display device 100 includes a substrate 110, a TFT Tr on or above the substrate, a planarization layer 150 covering the TFT Tr, and an OLED D on the planarization layer 150 and connected to the TFT Tr.

[0034] The substrate 110 can be a glass substrate or a flexible substrate. For example, the flexible substrate can be one of a polyimide (PI) substrate, a polyethersulfone (PES) substrate, a polyethylene naphthalate (PEN) substrate, a polyethylene terephthalate (PET) substrate, and a polycarbonate (PC) substrate.

[0035] A buffer layer 122 is formed on the substrate, and a TFT Tr is formed on the buffer layer 122. The buffer layer 122 can be omitted. For example, the buffer layer 122 can be formed of an inorganic insulating material such as silicon oxide or silicon nitride.

[0036] A semiconductor layer 120 is formed on the buffer layer 122. The semiconductor layer 120 may contain an oxide semiconductor material or polysilicon.

[0037] When the semiconductor layer 120 contains an oxide semiconductor material, a light-shielding pattern (not shown) can be formed beneath the semiconductor layer 120. Light reaching the semiconductor layer 120 is blocked or blocked by the light-shielding pattern, thereby preventing thermal degradation of the semiconductor layer 120. On the other hand, when the semiconductor layer 120 contains polysilicon, impurities can be doped into both sides of the semiconductor layer 120.

[0038] A gate insulating layer 124 of insulating material is formed on the semiconductor layer 120. The gate insulating layer 124 may be formed of an inorganic insulating material such as silicon oxide or silicon nitride.

[0039] A gate electrode 130 made of a conductive material (e.g., metal) is formed on the gate insulating layer 124 corresponding to the center of the semiconductor layer 120. Figure 2 In this case, the gate insulating layer 124 is formed over the 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.

[0040] An interlayer insulating layer 132 of insulating material is formed on the gate electrode 130 and above the entire surface of the substrate 110. The interlayer insulating layer 132 may be formed of inorganic insulating material (e.g., silicon oxide or silicon nitride) or organic insulating material (e.g., benzocyclobutene or photo-acryl).

[0041] The interlayer insulating layer 132 includes a first contact hole 134 and a second contact hole 136 that expose both sides of the semiconductor layer 120. The first contact hole 134 and the second contact hole 136 are positioned on both sides of the gate electrode 130 to be spaced apart from the gate electrode 130.

[0042] The first contact hole 134 and the second contact hole 136 are formed to pass 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 contact hole 134 and the second contact hole 136 are formed to pass through only the interlayer insulating layer 132.

[0043] A source electrode 144 and a drain electrode 146 made of a conductive material (e.g., metal) are formed on the interlayer insulating layer 132.

[0044] The source electrode 144 and the drain electrode 146 are spaced apart from each other relative to the gate electrode 130 and contact both sides of the semiconductor layer 120 through the first contact hole 134 and the second contact hole 136, respectively.

[0045] Semiconductor layer 120, gate electrode 130, source electrode 144, and drain electrode 146 constitute TFT Tr. TFT Tr is used as a driving element. That is, TFT Tr is ( Figure 1 (The) drive TFT Td.

[0046] In the TFT Tr, the gate electrode 130, the source electrode 144, and the drain electrode 146 are positioned above the semiconductor layer 120. That is, the TFT Tr has a coplanar structure.

[0047] Alternatively, in the TFT Tr, the gate electrode can be positioned below the semiconductor layer, and the source and drain electrodes can be positioned above the semiconductor layer, allowing the TFT Tr to have an anti-interleaved structure. In this case, the semiconductor layer can comprise amorphous silicon.

[0048] Although not shown, gate lines and data lines intersect each other to define pixel areas, and a switching TFT is formed to connect to the gate lines and data lines. The switching TFT is connected to a TFT Tr, which serves as a driving element. Furthermore, power lines and storage capacitors for maintaining the voltage of the gate electrode of the TFT Tr in a frame may be formed; the power lines may be formed parallel to and spaced apart from one of the gate lines and data lines.

[0049] A planarization layer 150 is formed on the entire surface of the substrate 110 to cover the source electrode 144 and the drain electrode 146. The planarization layer 150 provides a flat top surface and has a drain contact hole 152 that exposes the drain electrode 146 of the TFT Tr.

[0050] The OLED D is disposed on the planarization layer 150 and includes a first electrode 210 connected to the drain electrode 146 of the TFT Tr, an emissive layer 220, and a second electrode 230. The emissive layer 220 and the second electrode 230 are sequentially stacked on the first electrode 210. The OLED D is positioned in each of the red pixel region, the green pixel region, and the blue pixel region and emits red light, green light, and blue light, respectively.

[0051] A first electrode 210 is formed individually in each pixel region. The first electrode 210 can be an anode and may include a transparent conductive oxide material layer. The first electrode 210 can be formed of a conductive material with a relatively high work function, such as a transparent conductive oxide (TCO). For example, the first electrode 210 can be formed of one of the following: indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), tin oxide (SnO), zinc oxide (ZnO), indium copper oxide (ICO), and aluminum zinc oxide (Al:ZnO, AZO).

[0052] When the organic light-emitting display device 100 operates in a bottom-emitting mode, the first electrode 210 may have a single-layer structure with a transparent conductive oxide material layer. When the organic light-emitting display device 100 operates in a top-emitting mode, the first electrode 210 may also include a reflective electrode or a reflective layer. For example, the reflective electrode or reflective layer may be formed of silver (Ag) or an aluminum-palladium-copper (APC) alloy. In the top-emitting organic light-emitting display device 100, the first electrode 210 may have a three-layer structure of ITO / Ag / ITO or ITO / APC / ITO.

[0053] Furthermore, a dam layer 160 is formed on the planarization layer 150 to cover the edge of the first electrode 210. That is, the dam layer 160 is positioned at the boundary of the pixel region and exposes the center of the first electrode 210 in the pixel region.

[0054] A light-emitting layer 220, serving as a light-emitting unit, is formed on the first electrode 210. The light-emitting layer 220 includes a light-emitting material layer (EML) and an intermediate organic layer. For example, the intermediate organic layer may have a bilayer structure comprising a first organic layer as a hole blocking layer (HBL) and a second organic layer as an electron transport layer (ETL). Furthermore, the light-emitting layer 220 may also include at least one of a hole injection layer (HIL), a hole transport layer (HTL), an electron blocking layer (EBL), and an electron injection layer (EIL). Additionally, two or more light-emitting layers may be spaced apart from each other, allowing the OLED D to have a series structure.

[0055] A second electrode 230 is formed above the substrate 110 on which the light-emitting layer 220 is formed. The second electrode 230 covers the entire surface of the display area and can be formed of a conductive material with a relatively low work function to serve as a cathode. For example, the second electrode 230 can be formed of aluminum (Al), magnesium (Mg), calcium (Ca), silver (Ag), or alloys thereof, such as Mg-Ag alloy (MgAg). In the top-emitting type organic light-emitting display device 100, the second electrode 230 can have a thin profile to be transparent (or translucent).

[0056] Although not shown, the organic light-emitting display device 100 may also include a color filter. In a bottom-emitting organic light-emitting display device 100, the color filter may be positioned between the OLED D and the substrate 110, for example, between the interlayer insulating layer 132 and the planarization layer 150. Alternatively, in a top-emitting organic light-emitting display device 100, the color filter may be positioned on or above the second electrode 230 of the OLED D.

[0057] An encapsulation film (or encapsulation layer) 170 is formed on the second electrode 230 to prevent moisture from penetrating into the OLED D. The encapsulation film 170 includes, but is not limited to, a first inorganic insulating layer 172, an organic insulating layer 174, and a second inorganic insulating layer 176 stacked in sequence.

[0058] The organic light-emitting display device 100 may also include a polarizing plate (not shown) for reducing ambient light reflection. For example, the polarizing plate may be a circular polarizing plate. In a bottom-emitting organic light-emitting display device 100, the polarizing plate may be disposed below the substrate 110. In a top-emitting organic light-emitting display device 100, the polarizing plate may be disposed on or above the encapsulation film 170.

[0059] Furthermore, in the top-emitting organic light-emitting display device 100, a cover window (not shown) can be attached to the encapsulation film 170 or the polarizing plate. In this case, the substrate 110 and the cover window have flexible properties, enabling the provision of a flexible organic light-emitting display device.

[0060] Figure 3 This is a schematic cross-sectional view of an OLED according to a second embodiment of the present disclosure.

[0061] like Figure 3 As shown, OLED D1 includes a first electrode 210, a second electrode 230 facing the first electrode 210, and a light-emitting layer 220 therebetween. The light-emitting layer 220 includes an emissive layer (EML) 240 and an intermediate organic layer 260 between the EML 240 and the second electrode 230. The intermediate organic layer 260 includes a first organic layer 270 and a second organic layer 280. Figure 2 The organic light-emitting display device 100 includes a red pixel region, a green pixel region, and a blue pixel region, and the OLED D1 is positioned in each of the red pixel region, the green pixel region, and the blue pixel region.

[0062] The first electrode 210 can be an anode, and the second electrode 230 can be a cathode. One of the first electrode 210 and the second electrode 230 is a transparent electrode (semi-transparent electrode), and the other of the first electrode 210 and the second electrode 230 is a reflective electrode.

[0063] The light-emitting layer 220 may also include at least one of HTL 250 between the first electrode 210 and EML 240 and EBL 255 between HTL 250 and EML 240.

[0064] The light-emitting layer 220 may also include at least one of HIL245 between the first electrode 210 and HTL 250 and EIL290 between the second organic layer 280 of the intermediate organic layer 260 and the second electrode 230.

[0065] HTL 250 may contain at least one compound selected from the following: 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 (NPB or 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)-copolymer- (4,4'-(N-(4-sec-butylphenyl)diphenylamine))](TFB), di-[4-(N,N-di-p-tolyl-amino)-phenyl]cyclohexane (TAPC), 3,5-bis(9H-carbazole-9-yl)-N,N-diphenylaniline (DCDPA), N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazole-3-yl)phenyl)-9H-fluorene-2-amine and N-(biphenyl-4-yl)-N-(4-(9-phenyl-9H-carbazole-3-yl)phenyl)biphenyl-4-amine, but not limited to these. For example, the thickness of HTL 250 can be... to

[0066] HIL 245 may contain at least one compound selected from the following: 4,4',4”-tris(3-methylphenylamino)triphenylamine (MTDATA), 4,4',4”-tris(N,N-diphenylamino)triphenylamine (NATA), 4,4',4”-tris(N-(naphthyl-1-yl)-N-phenylamino)triphenylamine (1T-NATA), 4,4',4”-tris(N-(naphthyl-2-yl)-N-phenylamino)triphenylamine (2T-NATA), copper phthalocyanine (CuPc), tris(4-carbazolyl-9-ylphenyl)amine (TCTA), N PB (or NPD), 1,4,5,8,9,11-hexaazabenzophenanthrene hexanitrile (dipyrazino[2,3-f:2'3'-h]quinoxaline-2,3,6,7,10,11-hexanitrile (HAT-CN)), 1,3,5-tris[4-(diphenylamino)phenyl]benzene (TDAPB), poly(3,4-ethylenedioxythiophene)polystyrene sulfonate (PEDOT / PSS), and N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluorene-2-amine, but not limited to these. Alternatively, HIL245 may comprise materials of HTL250 and p-type dopants such as HAT-CN in Formula 4-1. The thickness of HIL245 can be... to

[0067] EBL 255 may contain at least one of the following compounds: TCTA, tris[4-(diethylamino)phenyl]amine, N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazole-3-yl)phenyl)-9H-fluorene-2-amine, TAPC, MTDATA, 1,3-bis(carbazole-9-yl)phenyl (mCP), 3,3'-bis(N-carbazole)-1,1'-biphenyl (mCBP), CuPc, N,N'-bis[4-[bis(3-methylphenyl)amino]phenyl]-N,N'-diphenyl-[1,1'-biphenyl]-4,4'-diamine (DNTPD), TDAPB, DCDPA, 2,8-bis(9-phenyl-9H-carbazole-3-yl)dibenzo[b,d]thiophene, and compounds of formula 4-3, but not limited thereto. The thickness of EBL 255 can be to

[0068] EIL 290 may contain Yb, LiF, CsF, NaF, BaF2, or alloys thereof. The thickness of EIL 290 can be... to

[0069] OLED D1 may also include a capping layer (not shown) below the first electrode 210 or on the second electrode 230. The capping layer may contain anthracene derivatives (compounds) and may have... to The thickness. For example, the anthracene derivative of the capping layer can be a compound of formulas 4-6.

[0070] EML 240 comprises a host and a dopant (emitter). The EML 240 in the red pixel region comprises a first host and a red dopant, the EML 240 in the green pixel region comprises a second host and a green dopant, and the EML 240 in the blue pixel region comprises a third host and a blue dopant. Each of the red, green, and blue dopants can be at least one of a phosphorescent compound, a fluorescent compound, and a delayed fluorescence compound. The thickness of EML 240 can be [missing information]. to

[0071] The first and second subjects can each be independently selected from 9,9'-diphenyl-9H,9'H-3,3'-bicarbazole (BCzPh), CBP, 1,3,5-tris(carbazole-9-yl)phenyl (TCP), TCTA, 4,4'-bis(carbazole-9-yl)-2,2'-dimethylbiphenyl (CDBP), 2,7-bis(carbazole-9-yl)-9,9-dimethylfluorene (DMFL-CBP), and 2,2',7,7'-tetra(carbazole-9-yl)-9,9-spirofluorene (spiro-CBP). DPEPO, 4'-(9H-carbazole-9-yl)biphenyl-3,5-dionitrile (PCzB-2CN), 3'-(9H-carbazole-9-yl)biphenyl-3,5-dionitrile (mCzB-2CN), 3,6-bis(carbazole-9-yl)-9-(2-ethylhexyl)-9H-carbazole (TCz1), bis(2-hydroxyphenyl)pyridine)beryllium (Bepp2), bis(10-hydroxybenzo[h]quinoline)beryllium (Bebq2) and 1,3,5-tris(1-pyrene)benzene (TPB3).

[0072] The red dopant can be selected from [bis(2-(4,6-dimethyl)phenylquinoline)](2,2,6,6-tetramethylheptane-3,5-diketoic acid)iridium(III), bis[2-(4-n-hexylphenyl)quinoline](acetylacetone)iridium(III))(Hex-Ir(phq)2(acac)), tris[2-(4-n-hexylphenyl)quinoline]iridium(III))(Hex-Ir(phq)3), tris[2-phenyl-4-methylquinoline]iridium(III))(Ir(Mphq)3, bis(2-phenylquinoline)(2,2,6,6-tetramethylheptane-3,5-diketoic acid)iridium(III))(Ir(dpm)PQ2, bis(phenylisoquinoline)(2,2,6,6-tetramethylheptane-3, 5-Diketoic acid)iridium(III)(Ir(dpm)(piq)2), bis[(4-n-hexylphenyl)isoquinoline](acetylacetone)iridium(III)(Hex-Ir(piq)2(acac)), tri[2-(4-n-hexylphenyl)quinoline]iridium(III)(Hex-Ir(piq)3), tri(2-(3-methylphenyl)-7-methyl-quinoline)iridium(Ir(dmpq)3), bis[2-(2-methylphenyl)-7-methyl-quinoline](acetylacetone)iridium(III)(Ir(dmpq)2(acac)) and bis[2-(3,5-dimethylphenyl)-4-methyl-quinoline](acetylacetone)iridium(III)(Ir(mphmq)2(acac)).

[0073] Green dopants can be selected from [bis(2-phenylpyridine)](pyridyl-2-benzofurano[2,3-b]pyridine)iridium, faceted-tris(2-phenylpyridine)iridium(III) (faceted-Ir(ppy)3), bis(2-phenylpyridine)(acetylacetone)iridium(III) (Ir(ppy)2(acac)), tris[2-(p-tolyl)pyridine]iridium(III) (Ir(mppy)3), bis(2-(naphthyl-2-yl)pyridine)(acetylacetone)iridium(III) (Ir(npy)2acac), tris(2-phenyl-3-methyl-pyridine)iridium (Ir(3mppy)3) and faceted-tris(2-(3-p-xylyl)phenyl)pyridineiridium(III) (TEG).

[0074] The third component can be selected from mCP, 9-(3-(9H-carbazole-9-yl)phenyl)-9H-carbazole-3-onitrile (mCP-CN), mCBP, CBP-CN, 9-(3-(9H-carbazole-9-yl)phenyl)-3-(diphenylphosphoyl)-9H-carbazole (mCPPO1), 3,5-bis(9H-carbazole-9-yl)biphenyl (Ph-mCP), TSPO1, 9-(3'-(9H-carbazole-9-yl)-[1,1'-biphenyl]-3-yl)-9H β-pyrido[2,3-b]indole (CzBPCb), bis(2-methylphenyl)diphenylsilane (UGH-1), 1,4-bis(triphenylsilyl)benzene (UGH-2), 1,3-bis(triphenylsilyl)benzene (UGH-3), 9,9-spirodifluorene-2-yl-diphenyl-phosphine oxide (SPPO1), 9,9'-(5-(triphenylsilyl)-1,3-phenylene)bis(9H-carbazole) (SimCP) and anthracene derivatives such as compounds of formulas 4-4. In addition, the blue dopant can be selected from perylene, 4,4'-bis[4-(di-p-tolylamino)styryl]biphenyl (DPAVBi), 4-(di-p-tolylamino)-4-4'-[(di-p-tolylamino)styryl]piperylene (DPAVB), 4,4'-bis[4-(diphenylamino)styryl]biphenyl (BDAVBi), 2,7-bis(4-diphenylamino)styryl-9,9-spirofluorene (spiro-DPVBi), [1,4-bis[2-[4-[N,N-di(p-tolyl)amino]phenyl]vinyl]benzene (DSB), 1,4-bis-[4-(N,N-diphenyl)amino]styryl-benzene (DSA), 2,5,8,11-tetratert-butylperylene (TBPe), bis(2-hydroxyphenyl-pyridine)beryllium (Bepp2), 9 -(9-phenylcarbazo-3-yl)-10-(naphth-1-yl)anthracene (PCAN), mer-tris(1-phenyl-3-methylimidazoline-2-ylidene-C,C(2)'iridium(III))(mer-Ir(pmi)3), facet-tris(1,3-diphenyl-benzimidazolin-2-ylidene-C,C(2)'iridium(III))(facet-Ir(dpbic)3), bis(3,4,5-trifluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl)iridium(III))(Ir(tfpd)2pic), tris(2-(4,6-difluorophenyl)pyridine)iridium(III))(Ir(Fppy)3), bis[2-(4,6-difluorophenyl)pyridine-C2,N](pyridinecarboxyl)iridium(III))(FIrpic) and pyrene derivatives such as compounds of formulas 4-5.

[0075] In the intermediate organic layer 260, the first organic layer 270 is positioned between EML 240 and EIL 290 or between EML 240 and the second electrode 230, and the second organic layer 280 is positioned between the first organic layer 270 and EIL 290 or between the first organic layer 270 and the second electrode 230. The first organic layer 270 and the second organic layer 280 are in contact with each other.

[0076] For example, the first organic layer 270 can be HBL, and the second organic layer 280 can be ETL.

[0077] The intermediate organic layer 260 comprises a first compound 272 having a structure in which the pyrimidine moiety and the quinoline moiety are directly connected (linked, bound, or joined) to each other. For example, the first organic layer 270 comprises the first compound 272. The first compound 272 is represented by Formula 1-1.

[0078] [Equation 1-1]

[0079]

[0080] In Formula 1-1, Ar1 and Ar2 are each independently selected from substituted or unsubstituted C6 to C50 aryl and substituted or unsubstituted C5 to C50 heteroaryl. R1 to R6 are each independently selected from hydrogen, deuterium, substituted or unsubstituted C1 to C10 alkyl, substituted or unsubstituted C6 to C30 aryl and substituted or unsubstituted C5 to C30 heteroaryl.

[0081] In this disclosure, unless otherwise specified, C6 to C50 aryl and / or C6 to C30 aryl groups may be selected from phenyl, biphenyl, terphenyl, naphthyl, anthracene, pentenyl, indene, indo-indene, hepta-enyl, biphenylene, indacenyl, phenanthrene, benzo[a]phenanthrene, dibenzo[a]phenanthrene, azulel, pyrene, fluoranyl, triphenylene, etc. yl, tetraphenyl, benzotetraphenyl, fenyl, pentaphenyl, benzopentaphenyl, fluorenyl, indofluorenyl and spirofluorenyl.

[0082] In this disclosure, unless otherwise specified, C5 to C50 heteroaryl groups and / or C5 to C30 heteroaryl groups may be selected from pyrroloyl, pyridyl, pyrimidinyl, pyrazinyl, pyridazinyl, triazinyl, tetraazinyl, imidazolyl, pyrazolyl, indoleyl, isoindoleyl, indazoleyl, indazinyl, pyrroloazinyl, carbazoleyl, benzo[carbazoleyl], dibenzo[carbazoleyl], indole[carbazoleyl], indo[carbazoleyl], benzo[furan[carbazoleyl], benzo[thiophene[carbazoleyl], quinolinyl, isoquinolinyl, phthalazinyl, quinoxalinyl, cinolinyl, quinazolinyl, quinazinyl, purineyl, benzo[quinolinyl], benzo[isoquinolinyl], benzo[quinazolinyl], benzo[quinoxalinyl], acridineyl, phenanthrene-rholineyl, vodiyl, phenanthrene-diyl, pteridineyl, naphridinyl, furanyl, etc. azino, azole group, diazole group, triazole group, di Ingyl, benzofuranyl, dibenzofuranyl, thiaranyl, xanthanyl, chromenyl, isochromenyl, thiazinyl, thiophenyl, benzothiophenyl, dibenzothiophenyl, difuran-pyrazinyl, benzofuran-dibenzofuranyl, benzothiophene-benzothiophenyl, benzothiophene-dibenzothiophenyl, benzothiophene-benzofuranyl and benzothiophene-dibenzofuranyl.

[0083] In this disclosure, unless otherwise specified, the substituents in the alkyl, aryl and / or heteroaryl groups may be at least one of deuterium, tritium, halogen, cyano, C1 to C20 alkyl, arylphosphine oxide, substituted or unsubstituted C6 to C30 aryl and substituted or unsubstituted C5 to C30 heteroaryl groups.

[0084] For example, in Formula 1-1, one of Ar1 and Ar2 can be an unsubstituted or C6 to C50 aryl such as phenyl substituted with a C1 to C20 alkyl such as tert-butyl, and the other of Ar1 and Ar2 can be a C6 to C50 aryl such as phenyl, naphthyl, biphenyl, fluorene substituted with at least one of an unsubstituted or substituted or substituted C6 to C30 aryl or a substituted or unsubstituted C5 to C30 heteroaryl.

[0085] The first compound 272 can be one of the compounds in formula 1-2.

[0086] [Equation 1-2]

[0087]

[0088]

[0089]

[0090]

[0091]

[0092]

[0093]

[0094]

[0095] The intermediate organic layer 260 further comprises a second compound 282, which is a pyrimidine derivative, a triazine derivative, or anthracene derivative. For example, the second organic layer 280 may comprise a second compound 282. The second compound 282 is represented by one of formulas 2-1, 2-2, and 2-3.

[0096] [Equation 2-1]

[0097]

[0098] In Formula 2-1, two of Ar11 to Ar13 are independently selected from substituted or unsubstituted C6 to C30 aryl groups, and the third is selected from substituted or unsubstituted C5 to C30 heteroaryl groups, which are substituted C6 to C30 aryl groups and substituted or unsubstituted C5 to C30 heteroaryl groups.

[0099] [Equation 2-2]

[0100]

[0101] In Formula 2-2, Ar21 and Ar22 are each independently selected from substituted or unsubstituted C6 to C30 aryl groups, and Ar23 is selected from unsubstituted or substituted C5 to C30 heteroaryl groups and substituted or unsubstituted C5 to C30 heteroaryl groups.

[0102] [Equation 2-3]

[0103]

[0104] In Formulas 2-3, Ar31 and Ar32 are each independently selected from hydrogen, substituted or unsubstituted C6 to C30 aryl groups and substituted or unsubstituted C5 to C30 heteroaryl groups, and Ar33 and Ar34 are each independently selected from substituted or unsubstituted C6 to C30 aryl groups and substituted or unsubstituted C5 to C30 heteroaryl groups.

[0105] The second compound 282 can be one of the compounds in formula 2-4.

[0106] [Equation 2-4]

[0107]

[0108]

[0109] The second organic layer 280 may also contain a third compound (not shown) that is a lithium (Li) derivative. For example, the lithium derivative may be lithium quinoline (Liq) of Formula 3.

[0110] [Formula 3]

[0111]

[0112] The volume percentage of the third compound relative to the second compound 282 can be 10 to 200, preferably 50 to 150.

[0113] The first organic layer 270 has a first thickness, and the second organic layer 280 has a second thickness greater than the first thickness. For example, the first thickness can be... to And the second thickness can be to

[0114] As shown above, the OLED D1 of this disclosure includes an intermediate organic layer 260 between an EML 240 and a second electrode 230 serving as a cathode. The intermediate organic layer 260 includes a first organic layer 270 and a second organic layer 280, and the first organic layer 270 contains a first compound 272 represented by Formula 1-1. Therefore, the reduced on-state voltage and driving voltage of the OLED D1 give the OLED D1 and the organic light-emitting display device 100 including the OLED D1 the advantages of reduced power consumption, improved luminous efficiency, and increased lifetime.

[0115] Furthermore, since the second organic layer 280 contains a second compound 282 represented by one of Formulas 2-1 to 2-3, the OLED D1 and the organic light-emitting display device 100 including the OLED D1 have significant advantages in reducing power consumption, improving luminous efficiency, and increasing lifespan.

[0116] Furthermore, since the second organic layer 280 contains a third compound that is a Li derivative, the characteristics of the OLED D1 and the organic light-emitting display device 100 including the OLED D1 are further improved.

[0117] [OLED]

[0118] Sequential deposition of the anode (ITO), HIL (compound in Formula 4-1 (12 vol%)) and the compound in Formula 4-2, HTL (the compound in formula 4-2), ), EBL (the compound in formula 4-3, EML (the compound in Formula 4-4 (the host) and the compound in Formula 4-5 (the dopant, 3 vol%)) HBL ETL EIL(Yb:LiF, ), cathode (Ag:Mg, ) and the capping layer (the compounds in Formula 4-6, To form OLED.

[0119] [Equation 4-1]

[0120]

[0121] [Equation 4-2]

[0122]

[0123] [Equation 4-3]

[0124]

[0125] [Equation 4-4]

[0126]

[0127] [Equation 4-5]

[0128]

[0129] [Equation 4-6]

[0130]

[0131] 1. Comparative Example

[0132] (1) Comparative Example 1 (Ref 1)

[0133] HBL is formed using compound E-1 from Formula 5, and ETL is formed using compound ET from Formula 6 and compound (Liq) from Formula 3. (Volume ratio (volume%), ET:Liq = 1:1)

[0134] (2) Comparative Example 2 (Ref 2)

[0135] HBL is formed using compound E-2 from Formula 5, and ETL is formed using compound ET from Formula 6 and compound (Liq) from Formula 3. (Volume ratio (volume%), ET:Liq = 1:1)

[0136] (3) Comparative Example 3 (Ref 3)

[0137] HBL is formed using compound E-3 from Formula 5, and ETL is formed using compound ET from Formula 6 and compound (Liq) from Formula 3. (Volume ratio (volume%), ET:Liq = 1:1)

[0138] 2. Example 1 (Ex1)

[0139] HBL is formed using compound A-3 from formulas 1-2, and ETL is formed using compound ET from formula 6 and compound (Liq) from formula 3. (Volume ratio (volume%), ET:Liq = 1:1)

[0140] [Formula 5]

[0141]

[0142] [Formula 6]

[0143]

[0144] The luminescence characteristics of the OLEDs in Comparative Examples 1 to 3 and Example 1, namely driving voltage (V), quantum efficiency (QE), blue index (cd / A / CIEy), and lifetime (T95), are measured and listed in Table 1.

[0145] Table 1

[0146]

[0147] The first compound in Formula 1-1 of this disclosure has a structure in which the second position of the pyrimidine moiety and the second position of the quinoline moiety are directly connected to each other, while compounds E-1, E-2 and E-3 used in the first organic layer (i.e., HBL) of the OLEDs of Ref1 to Ref3 have structures different from the first compound of this disclosure.

[0148] As shown in Table 1, compared with OLEDs of Ref1 to Ref3, in OLEDs in which the first organic layer comprises the first compound of Formula 1-1, the driving voltage is reduced and the quantum efficiency, blue index and lifetime are improved.

[0149] 3. Comparative Example 4 (Ref 4)

[0150] HBL is formed using compound HB from Formula 7, and ETL is formed using compound ET from Formula 6 and compound (Liq) from Formula 3. (Volume ratio (volume%), ET:Liq = 1:1)

[0151] 4. Example

[0152] (1) Example 2 (Ex2)

[0153] HBL is formed using compound A-3 from formulas 1-2, and ETL is formed using compound ET from formula 6 and compound (Liq) from formula 3. (Volume ratio (volume%), ET:Liq = 1:1)

[0154] (2) Example 3 (Ex3)

[0155] HBL is formed using compound A-3 from formula 1-2, and ETL is formed using compound D-5 from formula 2-4 and compound (Liq) from formula 3. (Volume ratio (volume%), D-5:Liq = 2:1)

[0156] (3) Example 4 (Ex4)

[0157] HBL is formed using compound A-20 from Formula 1-2, and ETL is formed using compound D-5 from Formula 2-4 and compound (Liq) from Formula 3. (Volume ratio (volume%), D-5:Liq = 2:1)

[0158] (4) Example 5 (Ex5)

[0159] HBL is formed using compound A-83 from Formula 1-2, and ETL is formed using compound D-5 from Formula 2-4 and compound (Liq) from Formula 3. (Volume ratio (volume%), D-5:Liq = 2:1)

[0160] (5) Example 6 (Ex6)

[0161] HBL is formed using compound A-83 from formula 1-2, and ETL is formed using compound D-5 from formula 2-4 and compound (Liq) from formula 3. (Volume ratio (volume%), D-5:Liq = 1:1)

[0162] (6) Example 7 (Ex7)

[0163] HBL is formed using compound A-3 from formula 1-2, and ETL is formed using compound B-2 from formula 2-4 and compound (Liq) from formula 3. (Volume ratio (volume%), B-2:Liq = 1:1)

[0164] (7) Example 8 (Ex8)

[0165] HBL is formed using compound A-20 from Formula 1-2, and ETL is formed using compound B-2 from Formula 2-4 and compound (Liq) from Formula 3. (Volume ratio (volume%), B-2:Liq = 1:1)

[0166] (8) Example 9 (Ex9)

[0167] HBL is formed using compound A-20 from Formula 1-2, and ETL is formed using compound B-2 from Formula 2-4 and compound (Liq) from Formula 3. (Volume ratio (volume%), B-2:Liq = 1:2)

[0168] (9) Example 10 (Ex10)

[0169] HBL is formed using compound A-83 from Formula 1-2, and ETL is formed using compound B-2 from Formula 2-4 and compound (Liq) from Formula 3. (Volume ratio (volume%), B-2:Liq = 1:1)

[0170] (10) Example 11 (Ex11)

[0171] HBL is formed using compound A-3 from formula 1-2, and ETL is formed using compound C-7 from formula 2-4 and compound (Liq) from formula 3. (Volume ratio (volume%), C-7:Liq = 1:2)

[0172] (11) Example 12 (Ex12)

[0173] HBL is formed using compound A-3 from formula 1-2, and ETL is formed using compound C-7 from formula 2-4 and compound (Liq) from formula 3. (Volume ratio (volume%), C-7:Liq = 1:1)

[0174] (12) Example 13 (Ex13)

[0175] HBL is formed using compound A-20 from formula 1-2, and ETL is formed using compound C-7 from formula 2-4 and compound (Liq) from formula 3. (Volume ratio (volume%), C-7:Liq = 1:2)

[0176] (13) Example 14 (Ex14)

[0177] HBL is formed using compound A-83 from formula 1-2, and ETL is formed using compound C-7 from formula 2-4 and compound (Liq) from formula 3. (Volume ratio (volume%), C-7:Liq = 1:2)

[0178] [Formula 7]

[0179]

[0180] The luminescence characteristics of the OLEDs in Comparative Example 4 and Examples 2 to 14, namely driving voltage (V), luminance (cd / A), quantum efficiency (QE), blue index (cd / A / CIEy), and lifetime (T95), are measured and listed in Table 2.

[0181] Table 2

[0182]

[0183]

[0184] As shown in Table 2, compared with OLEDs of Ref2 in which the first organic layer contains compounds of formula 7, OLEDs of Ex2 to Ex14 in which the first organic layer contains compounds of formula 1-1 have lower driving voltages and improved quantum efficiency, blue index and lifetime.

[0185] Furthermore, compared to OLEDs in which the second organic layer (i.e., ETL) comprises a compound of formula 6, OLEDs in which the second organic layer comprises a compound of formula 2-1 to formula 2-3 have a lower driving voltage and improved quantum efficiency, blue index and lifetime.

[0186] Figure 4 This is a schematic cross-sectional view of an OLED according to a third embodiment of the present disclosure.

[0187] like Figure 4 As shown, OLED D2 includes a first electrode 210, a second electrode 230 facing the first electrode 210, and a light-emitting layer 220 therebetween. The light-emitting layer 220 includes a first light-emitting portion 310 and a second light-emitting portion 350. The first light-emitting portion 310 includes a first EML 318 and a first intermediate organic layer 320, and the second light-emitting portion 350 includes a second EML 356 and a second intermediate organic layer 360. The second light-emitting portion 350 is positioned between the first light-emitting portion 310 and the second electrode 230. The first intermediate organic layer 320 is positioned between the first EML 318 and the second light-emitting portion 350 and includes a first organic layer 330 and a second organic layer 340. The second intermediate organic layer 360 is positioned between the second EML 356 and the second electrode 230 and includes a third organic layer 370 and a fourth organic layer 380. Furthermore, OLED D2 may also include a charge-generating layer (CGL) 390 between the first light-emitting portion 310 and the second light-emitting portion 350.

[0188] ( Figure 2 The organic light-emitting display device 100 includes a red pixel region, a green pixel region, and a blue pixel region, and the OLED D2 is positioned in each of the red pixel region, the green pixel region, and the blue pixel region.

[0189] The first electrode 210 can be an anode, and the second electrode 230 can be a cathode. One of the first electrode 210 and the second electrode 230 is a transparent electrode (semi-transparent electrode), and the other of the first electrode 210 and the second electrode 230 is a reflective electrode.

[0190] The first light-emitting part 310 may further include at least one of a first HTL 314 between the first electrode 210 and the first EML 318 and a first EBL 316 between the first HTL 314 and the first EML 318.

[0191] In addition, the first light-emitting part 310 may also include a HIL 312 between the first electrode 210 and the first HTL 314.

[0192] The second light-emitting part 350 may also include at least one of a second HTL 352 below the second EML 356 and a second EBL 354 between the second EML 356 and the second HTL 352.

[0193] In addition, the second light-emitting part 350 may also include EIL358 between the second intermediate organic layer 360 and the second electrode 230.

[0194] The first EML 318 and the second EML 356 are each one of a red EML, a green EML, and a blue EML. That is, light of the same color is emitted from the first light-emitting part 310 and the second light-emitting part 350. For example, the difference between the emission wavelength range of the first light-emitting part 310 or the first EML 318 and the emission wavelength range of the second light-emitting part 350 or the second EML 356 can be 0 nm to 20 nm.

[0195] CGL 390 is positioned between the first light-emitting part 310 and the second light-emitting part 350, and the first light-emitting part 310, CGL 390, and second light-emitting part 350 are sequentially stacked on the first electrode 210. That is, the first light-emitting part 310 is positioned between the first electrode 210 and CGL 390, and the second light-emitting part 350 is positioned between the second electrode 230 and CGL 390.

[0196] The first light-emitting part 310 and the second light-emitting part 350 are connected by a CGL 390. The CGL 390 can be a PN junction CGL of N-type CGL 392 and P-type CGL 394.

[0197] An N-type CGL 392 is positioned between the first intermediate organic layer 320 and the second light-emitting portion 350, and a P-type CGL 394 is positioned between the N-type CGL 392 and the second light-emitting portion 350. The N-type CGL 392 provides electrons to the first EML 318 of the first light-emitting portion 310, and the P-type CGL 394 provides holes to the second EML 356 of the second light-emitting portion 350.

[0198] At least one of the first intermediate organic layer 320 and the second intermediate organic layer 360 contains a compound represented by Formula 1-1. For example, the first organic layer 330 of the first intermediate organic layer 320 contains a first compound 332 represented by Formula 1-1, and / or the third organic layer 370 of the second intermediate organic layer 360 contains a fourth compound 372 represented by Formula 1-1.

[0199] The first organic layer 330 of the first intermediate organic layer 320 may contain a first compound 332 represented by Formula 1-1, and the third organic layer 370 of the second intermediate organic layer 360 may contain a fourth compound 372 represented by Formula 1-1. In this case, the first compound 332 contained in the first organic layer 330 of the first intermediate organic layer 320 and the fourth compound 372 contained in the third organic layer 370 of the second intermediate organic layer 360 may be the same or different.

[0200] The second organic layer 340, comprising a first intermediate organic layer 320 containing a compound represented by Formula 1-1, and / or the fourth organic layer 380, comprising a second intermediate organic layer 360 containing a compound represented by Formula 1-1, comprising a compound represented by one of Formulas 2-1 to 2-3.

[0201] When the first organic layer 330 of the first intermediate organic layer 320 contains a first compound 332 represented by Formula 1-1, the second organic layer 340 of the first intermediate organic layer 320 contains a second compound 342 represented by one of Formulas 2-1 to 2-3. In this case, the second organic layer 340 of the first intermediate organic layer 320 may also contain a third compound (not shown) that is a Li derivative. The volume percentage of the third compound relative to the second compound 342 is 10 to 200, preferably 50 to 150.

[0202] When the third organic layer 370 of the second intermediate organic layer 360 contains a fourth compound 372 represented by Formula 1-1, the fourth organic layer 380 of the second intermediate organic layer 360 contains a fifth compound 382 represented by one of Formulas 2-1 to 2-3. In this case, the fourth organic layer 380 of the second intermediate organic layer 360 may also contain a sixth compound (not shown) that is a Li derivative. The volume percentage of the sixth compound relative to the fifth compound 382 is 10 to 200, preferably 50 to 150.

[0203] When the first organic layer 330 and the third organic layer 370 of the first intermediate organic layer 320 respectively contain a first compound 332 represented by Formula 1-1 and a fourth compound 372 represented by Formula 1-1, the second organic layer 340 of the first intermediate organic layer 320 and the fourth organic layer 380 of the second intermediate organic layer 360 respectively contain a second compound 342 represented by one of Formulas 2-1 to 2-3 and a fifth compound 382 represented by one of Formulas 2-1 to 2-3. In this case, the second organic layer 340 of the first intermediate organic layer 320 and the fourth organic layer 380 of the second intermediate organic layer 360 may each further contain a sixth compound (not shown) that is a Li derivative. In the second organic layer 340 of the first intermediate organic layer 320, the volume percentage of the third compound relative to the second compound 342 is 10 to 200, preferably 50 to 150. In the fourth organic layer 380 of the second intermediate organic layer 360, the volume percentage of the sixth compound is 10 to 200, preferably 50 to 150, relative to the fifth compound 382.

[0204] When the second organic layer 340 of the first intermediate organic layer 320 and the fourth organic layer 380 of the second intermediate organic layer 360 respectively contain a second compound 342 represented by one of Formulas 2-1 to 2-3 and a fifth compound 382 represented by one of Formulas 2-1 to 2-3, the second compound 342 contained in the second organic layer 340 of the first intermediate organic layer 320 and the fifth compound 382 contained in the fourth organic layer 380 of the second intermediate organic layer 360 may be the same or different.

[0205] In the first intermediate organic layer 320, the thickness of the first organic layer 330 may be less than that of the second organic layer 340. In the second intermediate organic layer 360, the thickness of the third organic layer 370 may be less than that of the fourth organic layer 380.

[0206] As shown above, in the OLED D2 of this disclosure, the first light-emitting portion 310 includes a first intermediate organic layer 320 disposed on a first EML 318 and including a first organic layer 330 and a second organic layer 340, and the second light-emitting portion 350 includes a second intermediate organic layer 360 disposed on a second EML 356 and including a third organic layer 370 and a fourth organic layer 380. In this case, at least one of the first organic layer 330 in the first intermediate organic layer 320 and the third organic layer 370 in the second intermediate organic layer 360 contains first compounds 332 and 372 represented by Formula 1-1. Therefore, the on-state voltage and driving voltage of the OLED D2 are reduced, giving the OLED D2 and the organic light-emitting display device 100 including the OLED D2 the advantages of reduced power consumption, improved luminous efficiency, and increased lifetime.

[0207] Furthermore, since at least one of the second organic layer 340 in the first intermediate organic layer 320 and the fourth organic layer 380 in the second intermediate organic layer 360 contains the second compound 342 and 382 represented by one of Formulas 2-1 to 2-3, the OLED D2 and the organic light-emitting display device 100 including the OLED D2 have significant advantages in reducing power consumption, improving luminous efficiency and increasing lifespan.

[0208] Furthermore, since at least one of the second organic layer 340 in the first intermediate organic layer 320 and the fourth organic layer 380 in the second intermediate organic layer 360 also contains a sixth compound that is a Li derivative, the characteristics of OLED D2 and the organic light-emitting display device 100 including OLED D2 are further improved.

[0209] Furthermore, since the OLED D2 has a series structure and includes intermediate organic layers 320 and 360, the luminous efficiency of the OLED D2 and the organic light-emitting display device 100 including the OLED D2 is significantly improved while preventing or minimizing the increase in driving voltage.

[0210] Figure 5 This is a schematic cross-sectional view of an organic light-emitting display device according to the fourth embodiment of this disclosure.

[0211] like Figure 5 As shown, the organic light-emitting display device 400 includes: a substrate 410 defining a first pixel region P1, a second pixel region P2, and a third pixel region P3; a TFT Tr on or above the substrate 410; an OLED D above and connected to the TFT Tr; and a color filter layer 420 corresponding to the first pixel region P1, the second pixel region P2, and the third pixel region P3. For example, the first pixel region P1 can be a red pixel region, the second pixel region P2 can be a green pixel region, and the third pixel region P3 can be a blue pixel region. The first pixel region P1, the second pixel region P2, and the third pixel region P3 constitute a pixel unit.

[0212] The substrate 410 can be a glass substrate or a flexible substrate. For example, the flexible substrate can be one of a polyimide (PI) substrate, a polyethersulfone (PES) substrate, a polyethylene naphthalate (PEN) substrate, a polyethylene terephthalate (PET) substrate, and a polycarbonate (PC) substrate.

[0213] The TFT Tr is positioned on the substrate 410. Alternatively, a buffer layer (not shown) may be formed on the substrate 410, and the TFT Tr may be formed on the buffer layer.

[0214] For reference Figure 2As described, the TFT Tr includes a semiconductor layer, a gate electrode, a source electrode, and a drain electrode, and acts as a driving element. That is, the TFT Tr can be ( Figure 1 (The) drive TFT Td.

[0215] The color filter layer 420 is positioned on or above the substrate 410. For example, the color filter layer 420 may include a first color filter layer 422 corresponding to a first pixel region P1, a second color filter layer 424 corresponding to a second pixel region P2, and a third color filter layer 426 corresponding to a third pixel region P3. The first color filter layer 422 may be a red color filter layer, the second color filter layer 424 may be a green color filter layer, and the third color filter layer 426 may be a blue color filter layer. For example, the first color filter layer 422 may contain at least one of a red dye and a red pigment, the second color filter layer 424 may contain at least one of a green dye and a green pigment, and the third color filter layer 426 may contain at least one of a blue dye and a blue pigment.

[0216] A planarization layer 450 is disposed on the TFT Tr and the color filter layer 420. The planarization layer 450 has a flat top surface and includes a drain contact hole 452 that exposes the drain electrode of the TFT Tr.

[0217] OLED D is disposed on planarization layer 450 and corresponds to color filter layer 420. OLED D includes a first electrode 470, an emissive layer 480, and a second electrode 490. The first electrode 470 is connected to the drain electrode of TFT Tr through drain contact hole 452, and the emissive layer 480 and the second electrode 490 are sequentially stacked on the first electrode 470. OLED D is positioned in each of the first pixel region P1, the second pixel region P2, and the third pixel region P3, and emits white light in each of the first pixel region P1, the second pixel region P2, and the third pixel region P3.

[0218] The first electrode 470 may be formed separately in each of the first pixel region P1, the second pixel region P2 and the third pixel region P3, and the second electrode 490 may be formed integrally to correspond to the first pixel region P1, the second pixel region P2 and the third pixel region P3.

[0219] The first electrode 470 is one of the anode and the cathode, and the second electrode 490 is the other of the anode and the cathode. The first electrode 470 is a transparent (or semi-transparent) electrode, and the second electrode 490 is a reflective electrode.

[0220] For example, the first electrode 470 can be an anode and may include a layer of transparent conductive oxide material formed of a conductive material with a relatively high work function (e.g., a transparent conductive oxide material). The second electrode 490 can be a cathode and may include a layer of metallic material formed of a conductive material with a relatively low work function (e.g., a low-resistance metal). For example, the transparent conductive oxide material layer of the first electrode 470 may include one of indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), tin oxide (SnO), zinc oxide (ZnO), indium copper oxide (ICO), and aluminum zinc oxide (Al:ZnO, AZO), and the second electrode 490 may be formed of aluminum (Al), magnesium (Mg), calcium (Ca), silver (Ag), alloys thereof such as magnesium-silver alloy (MgAg), or combinations thereof.

[0221] A light-emitting layer 480, serving as a light-emitting unit, is formed on the first electrode 470. The light-emitting layer 480 includes at least two light-emitting portions that emit light of different colors. Each light-emitting portion includes an EML and an intermediate organic layer. For example, the intermediate organic layer may have a bilayer structure comprising a first organic layer of type HBL and a second organic layer of type ETL. Furthermore, each light-emitting portion may also include at least one of HIL, HTL, EBL, and EIL. Additionally, the light-emitting layer 480 may include a CGL between the light-emitting portions.

[0222] In this case, at least one of the intermediate organic layers comprises a first compound represented by Formula 1-1. For example, the first organic layer of the intermediate organic layer may comprise a first compound represented by Formula 1-1. Furthermore, the second organic layer of the intermediate organic layer may comprise a second compound represented by one of Formulas 2-1 to 2-3. Additionally, the second organic layer of the intermediate organic layer may also comprise a third compound that is a Li derivative.

[0223] A dam layer 460 is formed on the planarization layer 450, covering the edge of the first electrode 470. The dam layer 460 exposes the center of the first electrode 470 corresponding to the first pixel region P1, the second pixel region P2, and the third pixel region P3. As shown above, since the OLED D emits white light at the first pixel region P1, the second pixel region P2, and the third pixel region P3, the light-emitting layer 480 can be continuously formed as a common layer through the first pixel region P1, the second pixel region P2, and the third pixel region P3. The dam layer 460 is formed to prevent current leakage at the edge of the first electrode 470, and the dam layer 460 can be omitted.

[0224] The organic light-emitting display device 400 may also include an encapsulation film (or encapsulation layer) formed on the second electrode 490 to prevent moisture from penetrating into the OLED D. Furthermore, the organic light-emitting display device 400 may also include a polarizing plate beneath the substrate 410 to reduce ambient light reflection.

[0225] In the organic light-emitting display device 400, the first electrode 470 is a transparent electrode, the second electrode 470 is a reflective electrode, and the color filter layer 420 is disposed between the substrate 410 and the OLED D. That is, the organic light-emitting display device 400 is a bottom-emitting organic light-emitting display device.

[0226] Alternatively, in the organic light-emitting display device 400, the first electrode 470 can be a reflective electrode, the second electrode 470 can be a transparent electrode, and the color filter layer 420 can be disposed on or above the OLED D.

[0227] In the organic light-emitting display device 400, the OLEDs in the first pixel region P1, the second pixel region P2, and the third pixel region P3 emit white light, and the white light passes through the first color filter layer 422, the second color filter layer 424, and the third color filter layer 426. Therefore, red, green, and blue are displayed in the first pixel region P1, the second pixel region P2, and the third pixel region P3, respectively.

[0228] Although not shown, a color conversion layer may be provided between the OLED D and the color filter layer 420. The color conversion layer may include a red color conversion layer, a green color conversion layer, and a blue color conversion layer corresponding to the first pixel region P1, the second pixel region P2, and the third pixel region P3, respectively, and may convert white light into red light, green light, and blue light through the red, green, and blue color conversion layers, respectively. For example, the color conversion layer may contain quantum dots. The color purity of the organic light-emitting display device 400 can be further improved by the color conversion layer.

[0229] In addition, a color conversion layer may be included instead of color filter layer 420.

[0230] Figure 6 This is a schematic cross-sectional view of an OLED according to the fifth embodiment of this disclosure.

[0231] like Figure 6As shown, OLED D3 includes a first electrode 470, a second electrode 490 facing the first electrode 470, and a light-emitting layer 480 therebetween. The light-emitting layer 480 includes a first light-emitting portion 510, a second light-emitting portion 530, and a third light-emitting portion 550. The first light-emitting portion 510 includes a first EML 518 and a first intermediate organic layer 520. The second light-emitting portion 530 includes a second EML 536 and a second intermediate organic layer 540. The third light-emitting portion 550 includes a third EML 556 and a third intermediate organic layer 560. The second light-emitting portion 530 is positioned between the first light-emitting portion 510 and the second electrode 490. The third light-emitting portion 550 is positioned between the second light-emitting portion 530 and the second electrode 490. The first intermediate organic layer 520 is positioned between the first EML 518 and the second light-emitting portion 530, and includes a first organic layer 522 and a second organic layer 526. The second intermediate organic layer 540 is positioned between the second EML 536 and the third light-emitting portion 550, and includes a third organic layer 542 and a fourth organic layer 546. The third intermediate organic layer 560 is positioned between the third EML 556 and the second electrode 490, and includes a fifth organic layer 562 and a sixth organic layer 566. Furthermore, the OLED D3 may also include a first CGL 570 between the first light-emitting portion 510 and the second light-emitting portion 530, and a second CGL 580 between the second light-emitting portion 530 and the third light-emitting portion 550.

[0232] ( Figure 5 The organic light-emitting display device 400 includes a red pixel area, a green pixel area and a blue pixel area, and the OLED D3 is positioned in each of the red pixel area, the green pixel area and the blue pixel area.

[0233] The first electrode 470 can be an anode, and the second electrode 490 can be a cathode. One of the first electrode 470 and the second electrode 490 is a transparent electrode (semi-transparent electrode), and the other of the first electrode 470 and the second electrode 490 is a reflective electrode.

[0234] The first light-emitting part 510 may further include at least one of a first HTL 514 between the first electrode 470 and the first EML 518 and a first EBL 516 between the first HTL 514 and the first EML 518.

[0235] In addition, the first light-emitting part 510 may also include a HIL 512 between the first electrode 470 and the first HTL 514.

[0236] The second light-emitting part 530 may also include at least one of a second HTL 532 below the second EML 536 and a second EBL 534 between the second EML 536 and the second HTL 532.

[0237] The third light-emitting part 550 may also include at least one of the third HTL 552 below the third EML 556 and the third EBL 554 between the third EML 556 and the third HTL 552.

[0238] In addition, the third light-emitting part 550 may also include EIL558 between the third intermediate organic layer 560 and the second electrode 490.

[0239] One of the first EML 518, the second EML 536, and the third EML 556 is a green EML, another of the first EML 518, the second EML 536, and the third EML 556 is a blue EML, and the remaining of the first EML 518, the second EML 536, and the third EML 556 is a red EML.

[0240] For example, the first EML 518 can be a red EML, the second EML 536 can be a green EML, and the third EML 556 can be a blue EML. Alternatively, the first EML 518 can be a blue EML, the second EML 536 can be a green EML, and the third EML 556 can be a red EML.

[0241] The first light-emitting portion 570 is positioned between the first light-emitting portion 510 and the second light-emitting portion 530, and the second light-emitting portion 580 is positioned between the second light-emitting portion 530 and the third light-emitting portion 550. That is, the first light-emitting portion 510, the first light-emitting portion 570, the second light-emitting portion 530, the second light-emitting portion 580, and the third light-emitting portion 550 are sequentially stacked on the first electrode 470. In other words, the first light-emitting portion 510 is positioned between the first electrode 470 and the first light-emitting portion 570, the second light-emitting portion 530 is positioned between the first light-emitting portion 570 and the second light-emitting portion 580, and the third light-emitting portion 550 is positioned between the second electrode 490 and the second light-emitting portion 580.

[0242] The first light-emitting part 510 and the second light-emitting part 530 are connected by a first CGL 570, and the second light-emitting part 530 and the third light-emitting part 550 are connected by a second CGL 580. The first CGL 570 can be a first PN junction CGL of a first N-type CGL 572 and a first P-type CGL 574, and the second CGL 580 can be a second PN junction CGL of a second N-type CGL 582 and a second P-type CGL 584.

[0243] A first N-type CGL 572 is positioned between the first intermediate organic layer 520 and the second light-emitting portion 530, and a first P-type CGL 574 is positioned between the first N-type CGL 572 and the second light-emitting portion 530. The first N-type CGL 572 provides electrons to the first EML 518 of the first light-emitting portion 510, and the first P-type CGL 574 provides holes to the second EML 536 of the second light-emitting portion 530.

[0244] The second N-type CGL 582 is positioned between the second intermediate organic layer 540 and the third light-emitting portion 550, and the second P-type CGL 584 is positioned between the second N-type CGL 582 and the third light-emitting portion 550. The second N-type CGL 582 provides electrons to the second EML 536 of the second light-emitting portion 530, and the second P-type CGL 584 provides holes to the third EML 556 of the third light-emitting portion 550.

[0245] At least one of the first intermediate organic layer 520, the second intermediate organic layer 540, and the third intermediate organic layer 560 contains a compound represented by Formula 1-1. For example, at least one of the first compound 524 contained in the first organic layer 522 of the first intermediate organic layer 520, the fourth compound 544 contained in the third organic layer 542 of the second intermediate organic layer 540, and the seventh compound 564 contained in the fifth organic layer 562 of the third intermediate organic layer 560 is the first compound represented by Formula 1-1.

[0246] When two or more of the following are first compounds represented by Formula 1-1: first compound 524 contained in first organic layer 522 of first intermediate organic layer 520, fourth compound 544 contained in third organic layer 542 of second intermediate organic layer 540, and seventh compound 564 contained in fifth organic layer 562 of third intermediate organic layer 560, first compound 524, fourth compound 544 and seventh compound 564 may be the same or different.

[0247] The second organic layer 526 comprising a first intermediate organic layer 520 of a first compound represented by Formula 1-1, the fourth organic layer 546 comprising a second intermediate organic layer 540 of a first compound represented by Formula 1-1, and / or the sixth organic layer 566 comprising a third intermediate organic layer 560 of a first compound represented by Formula 1-1 comprising a second compound represented by one of Formulas 2-1 to 2-3.

[0248] When the first organic layer 522 of the first intermediate organic layer 520 contains a first compound 524 represented by Formula 1-1, the second organic layer 526 of the first intermediate organic layer 520 contains a second compound 528 represented by one of Formulas 2-1 to 2-3. In this case, the second organic layer 526 of the first intermediate organic layer 520 may also contain a third compound (not shown) that is a Li derivative. The volume percentage of the third compound relative to the second compound 528 is 10 to 200, preferably 50 to 150.

[0249] When the third organic layer 542 of the second intermediate organic layer 540 contains a fourth compound 544 represented by Formula 1-1, the fourth organic layer 546 of the second intermediate organic layer 540 contains a fifth compound 548 represented by one of Formulas 2-1 to 2-3. In this case, the fourth organic layer 546 of the second intermediate organic layer 540 may also contain a sixth compound (not shown) that is a Li derivative. The volume percentage of the sixth compound relative to the fifth compound 548 is 10 to 200, preferably 50 to 150.

[0250] When the fifth organic layer 562 of the third intermediate organic layer 560 contains a seventh compound 564 represented by Formula 1-1, the sixth organic layer 566 of the third intermediate organic layer 560 contains an eighth compound 568 represented by one of Formulas 2-1 to 2-3. In this case, the sixth organic layer 566 of the third intermediate organic layer 560 may also contain a ninth compound (not shown) that is a Li derivative. The volume percentage of the ninth compound relative to the eighth compound 568 is 10 to 200, preferably 50 to 150.

[0251] When the first organic layer 522 of the first intermediate organic layer 520, the third organic layer 542 of the second intermediate organic layer 540, and the fifth organic layer 562 of the third intermediate organic layer 560 respectively contain a first compound 524 represented by Formula 1-1, a fourth compound 544 represented by Formula 1-1, and a seventh compound 564 represented by Formula 1-1, the second organic layer 526 of the first intermediate organic layer 520, the fourth organic layer 546 of the second intermediate organic layer 540, and the sixth organic layer 566 of the third intermediate organic layer 560 respectively contain a second compound 528 represented by one of Formulas 2-1 to 2-3, a fifth compound 548 represented by one of Formulas 2-1 to 2-3, and an eighth compound 568 represented by one of Formulas 2-1 to 2-3. In this configuration, the second organic layer 526 of the first intermediate organic layer 520, the fourth organic layer 546 of the second intermediate organic layer 540, and the sixth organic layer 566 of the third intermediate organic layer 560 may each further comprise a ninth compound (not shown) that is a Li derivative. In the second organic layer 526 of the first intermediate organic layer 520, the volume percentage of the third compound relative to the second compound 528 is 10 to 200, preferably 50 to 150. In the fourth organic layer 546 of the second intermediate organic layer 540, the volume percentage of the sixth compound relative to the fifth compound 548 is 10 to 200, preferably 50 to 150. In the sixth organic layer 566 of the third intermediate organic layer 560, the volume percentage of the ninth compound relative to the eighth compound 568 is 10 to 200, preferably 50 to 150.

[0252] When the second organic layer 526 of the first intermediate organic layer 520, the fourth organic layer 546 of the second intermediate organic layer 540, and the sixth organic layer 566 of the third intermediate organic layer 560 respectively contain a second compound 528 represented by one of Formulas 2-1 to 2-3, a fifth compound 548 represented by one of Formulas 2-1 to 2-3, and an eighth compound 568 represented by one of Formulas 2-1 to 2-3, the second compound 528 contained in the second organic layer 526 of the first intermediate organic layer 520, the fifth compound 548 contained in the fourth organic layer 546 of the second intermediate organic layer 540, and the eighth compound 568 contained in the sixth organic layer 566 of the third intermediate organic layer 560 may be the same or different.

[0253] In the first intermediate organic layer 520, the thickness of the first organic layer 522 may be less than that of the second organic layer 526. In the second intermediate organic layer 540, the thickness of the third organic layer 542 may be less than that of the fourth organic layer 546. In the third intermediate organic layer 560, the thickness of the fifth organic layer 562 may be less than that of the sixth organic layer 566.

[0254] As shown above, in the OLED D3 of this disclosure, the first light-emitting portion 510 includes a first intermediate organic layer 520 disposed on a first EML 518 and including a first organic layer 522 and a second organic layer 526; the second light-emitting portion 530 includes a second intermediate organic layer 540 disposed on a second EML 536 and including a third organic layer 542 and a fourth organic layer 546; and the third light-emitting portion 550 includes a third intermediate organic layer 560 disposed on a third EML 556 and including a fifth organic layer 562 and a sixth organic layer 566. In this case, at least one of the first organic layer 522 in the first intermediate organic layer 520, the third organic layer 542 in the second intermediate organic layer 540, and the fifth organic layer 562 in the third intermediate organic layer 560 contains a compound represented by Formula 1-1. Therefore, the on-state voltage and driving voltage of the OLED D3 are reduced, giving the OLED D3 and the organic light-emitting display device 400 including the OLED D3 the advantages of reduced power consumption, improved luminous efficiency, and increased lifetime.

[0255] Furthermore, since at least one of the second organic layer 526 in the first intermediate organic layer 520, the fourth organic layer 546 in the second intermediate organic layer 540, and the sixth organic layer 566 in the third intermediate organic layer 560 contains a compound represented by one of Formulas 2-1 to 2-3, the OLED D3 and the organic light-emitting display device 400 including the OLED D3 have significant advantages in reducing power consumption, improving luminous efficiency, and increasing lifespan.

[0256] Furthermore, since at least one of the second organic layer 526 in the first intermediate organic layer 520, the fourth organic layer 546 in the second intermediate organic layer 540, and the sixth organic layer 566 in the third intermediate organic layer 560 also contains a compound that is a Li derivative, the characteristics of the OLED D3 and the organic light-emitting display device 400 including the OLED D3 are further improved.

[0257] Furthermore, since the OLED D3 has a series structure and includes intermediate organic layers 520, 540 and 560, the luminous efficiency of the OLED D3 and the organic light-emitting display device 400 including the OLED D3 is significantly improved while preventing or minimizing the increase in driving voltage.

[0258] In the organic light-emitting display device 400, the OLEDs D3 in the first pixel region P1, the second pixel region P2, and the third pixel region P3 emit white light, and the white light passes through the first color filter layer 422, the second color filter layer 424, and the third color filter layer 426. Therefore, red, green, and blue are displayed in the first pixel region P1, the second pixel region P2, and the third pixel region P3, respectively.

[0259] Figure 7 This is a schematic cross-sectional view of an OLED according to the sixth embodiment of this disclosure.

[0260] like Figure 7 As shown, OLED D4 includes a first electrode 470, a second electrode 490 facing the first electrode 470, and a light-emitting layer 480 therebetween. The light-emitting layer 480 includes a first light-emitting portion 610, a second light-emitting portion 630, and a third light-emitting portion 650. The first light-emitting portion 610 includes a first EML 618 and a first intermediate organic layer 620. The second light-emitting portion 630 includes a second EML 636 and a second intermediate organic layer 640. The third light-emitting portion 650 includes a third EML 656 and a third intermediate organic layer 660. The second light-emitting portion 630 is positioned between the first light-emitting portion 610 and the second electrode 490. The third light-emitting portion 650 is positioned between the second light-emitting portion 630 and the second electrode 490. The first intermediate organic layer 620 is positioned between the first EML 618 and the second light-emitting portion 630, and includes a first organic layer 622 and a second organic layer 626. The second intermediate organic layer 640 is positioned between the second EML 636 and the third light-emitting portion 650, and includes a third organic layer 642 and a fourth organic layer 646. The third intermediate organic layer 660 is positioned between the third EML 656 and the second electrode 490, and includes a fifth organic layer 662 and a sixth organic layer 666. Furthermore, the OLED D4 may also include a first CGL 670 between the first light-emitting portion 610 and the second light-emitting portion 630, and a second CGL 680 between the second light-emitting portion 630 and the third light-emitting portion 650.

[0261] ( Figure 5 The organic light-emitting display device 400 includes a red pixel region, a green pixel region, and a blue pixel region, and the OLED D4 is positioned in each of the red pixel region, the green pixel region, and the blue pixel region.

[0262] The first electrode 470 can be an anode, and the second electrode 490 can be a cathode. One of the first electrode 470 and the second electrode 490 is a transparent electrode (semi-transparent electrode), and the other of the first electrode 470 and the second electrode 490 is a reflective electrode.

[0263] The first light-emitting part 610 may further include at least one of a first HTL 614 between the first electrode 470 and the first EML 618 and a first EBL 616 between the first HTL 614 and the first EML 618.

[0264] In addition, the first light-emitting part 610 may also include a HIL 612 between the first electrode 470 and the first HTL 614.

[0265] The second light-emitting part 630 may further include at least one of a second HTL 632 below the second EML 636 and a second EBL 634 between the second EML 636 and the second HTL 632.

[0266] In the second light-emitting part 630, the second EML 636 includes a first layer 636a, a second layer 636b above the first layer 636a, and a third layer 636c between the first layer 636a and the second layer 636b.

[0267] The third light-emitting part 650 may also include at least one of a third HTL 652 below the third EML 656 and a third EBL 654 between the third EML 656 and the third HTL 652.

[0268] In addition, the third light-emitting part 650 may also include EIL658 between the third intermediate organic layer 660 and the second electrode 490.

[0269] The first EML 618 and the third EML 656 are each blue EMLs. In the second EML 636, one of the first layer 636a and the second layer 636b is a red EML, and the other of the first layer 636a and the second layer 636b is a green EML. The third layer 636c is a yellow-green EML. Alternatively, the third layer 636c can be omitted so that the second EML 636 can have a two-layer structure including the first layer 636a and the second layer 636b.

[0270] The first light-emitting portion 670 is positioned between the first light-emitting portion 610 and the second light-emitting portion 630, and the second light-emitting portion 680 is positioned between the second light-emitting portion 630 and the third light-emitting portion 650. That is, the first light-emitting portion 610, the first light-emitting portion 670, the second light-emitting portion 630, the second light-emitting portion 680, and the third light-emitting portion 650 are sequentially stacked on the first electrode 470. In other words, the first light-emitting portion 610 is positioned between the first electrode 470 and the first light-emitting portion 670, the second light-emitting portion 630 is positioned between the first light-emitting portion 670 and the second light-emitting portion 680, and the third light-emitting portion 650 is positioned between the second electrode 490 and the second light-emitting portion 680.

[0271] The first light-emitting part 610 and the second light-emitting part 630 are connected by a first CGL 670, and the second light-emitting part 630 and the third light-emitting part 650 are connected by a second CGL 680. The first CGL 670 can be the first PN junction CGL of a first N-type CGL 672 and a first P-type CGL 674, and the second CGL 680 can be the second PN junction CGL of a second N-type CGL 682 and a second P-type CGL 684.

[0272] A first N-type CGL 672 is positioned between the first intermediate organic layer 620 and the second light-emitting portion 630, and a first P-type CGL 674 is positioned between the first N-type CGL 672 and the second light-emitting portion 630. The first N-type CGL 672 provides electrons to the first EML 618 of the first light-emitting portion 610, and the first P-type CGL 674 provides holes to the second EML 636 of the second light-emitting portion 630.

[0273] A second N-type CGL 682 is positioned between the second intermediate organic layer 640 and the third light-emitting portion 650, and a second P-type CGL 684 is positioned between the second N-type CGL 682 and the third light-emitting portion 650. The second N-type CGL 682 provides electrons to the second EML 636 of the second light-emitting portion 630, and the second P-type CGL 684 provides holes to the third EML 656 of the third light-emitting portion 650.

[0274] At least one of the first intermediate organic layer 620, the second intermediate organic layer 640, and the third intermediate organic layer 660 contains a compound represented by Formula 1-1. For example, at least one of the first compound 624 contained in the first organic layer 622 of the first intermediate organic layer 620, the fourth compound 644 contained in the third organic layer 642 of the second intermediate organic layer 640, and the seventh compound 664 contained in the fifth organic layer 662 of the third intermediate organic layer 660 is the first compound represented by Formula 1-1.

[0275] When two or more of the following compounds are represented by Formula 1-1: the first compound 624 contained in the first organic layer 622 of the first intermediate organic layer 620, the fourth compound 644 contained in the third organic layer 642 of the second intermediate organic layer 640, and the seventh compound 664 contained in the fifth organic layer 662 of the third intermediate organic layer 660, the first compound 624, the fourth compound 644, and the seventh compound 664 may be the same or different.

[0276] The second organic layer 626, which contains a first intermediate organic layer 620 of a compound represented by Formula 1-1, the fourth organic layer 646, which contains a second intermediate organic layer 640 of a compound represented by Formula 1-1, and / or the sixth organic layer 666, which contains a third intermediate organic layer 660 of a compound represented by Formula 1-1, contain a compound represented by one of Formulas 2-1 to 2-3.

[0277] When the first organic layer 622 of the first intermediate organic layer 620 contains a first compound 624 represented by Formula 1-1, the second organic layer 626 of the first intermediate organic layer 620 contains a second compound 628 represented by one of Formulas 2-1 to 2-3. In this case, the second organic layer 626 of the first intermediate organic layer 620 may also contain a third compound (not shown) that is a Li derivative. The volume percentage of the third compound relative to the second compound 628 is 10 to 200, preferably 50 to 150.

[0278] When the third organic layer 642 of the second intermediate organic layer 640 contains a fourth compound 644 represented by Formula 1-1, the fourth organic layer 646 of the second intermediate organic layer 640 contains a fifth compound 648 represented by one of Formulas 2-1 to 2-3. In this case, the fourth organic layer 646 of the second intermediate organic layer 640 may also contain a sixth compound (not shown) that is a Li derivative. The volume percentage of the sixth compound relative to the fifth compound 648 is 10 to 200, preferably 50 to 150.

[0279] When the fifth organic layer 662 of the third intermediate organic layer 660 contains the seventh compound 664 represented by Formula 1-1, the sixth organic layer 666 of the third intermediate organic layer 660 contains the eighth compound 668 represented by one of Formulas 2-1 to 2-3. In this case, the sixth organic layer 666 of the third intermediate organic layer 660 may also contain a ninth compound (not shown) that is a Li derivative. The volume percentage of the ninth compound relative to the eighth compound 668 is 10 to 200, preferably 50 to 150.

[0280] When the first organic layer 622 of the first intermediate organic layer 620, the third organic layer 642 of the second intermediate organic layer 640, and the fifth organic layer 662 of the third intermediate organic layer 660 respectively contain a first compound 624 represented by Formula 1-1, a fourth compound 644 represented by Formula 1-1, and a seventh compound 664 represented by Formula 1-1, the second organic layer 626 of the first intermediate organic layer 620, the fourth organic layer 646 of the second intermediate organic layer 640, and the sixth organic layer 666 of the third intermediate organic layer 660 respectively contain a second compound 628 represented by one of Formulas 2-1 to 2-3, a fifth compound 648 represented by one of Formulas 2-1 to 2-3, and an eighth compound 668 represented by one of Formulas 2-1 to 2-3. In this case, the second organic layer 626 of the first intermediate organic layer 620, the fourth organic layer 646 of the second intermediate organic layer 640, and the sixth organic layer 666 of the third intermediate organic layer 660 may each further comprise a compound (not shown) that is a Li derivative. In the second organic layer 626 of the first intermediate organic layer 620, the volume percentage of the third compound relative to the second compound 628 is 10 to 200, preferably 50 to 150. In the fourth organic layer 646 of the second intermediate organic layer 640, the volume percentage of the sixth compound relative to the fifth compound 648 is 10 to 200, preferably 50 to 150. In the sixth organic layer 666 of the third intermediate organic layer 660, the volume percentage of the ninth compound relative to the eighth compound 668 is 10 to 200, preferably 50 to 150.

[0281] When the second organic layer 626 of the first intermediate organic layer 620, the fourth organic layer 646 of the second intermediate organic layer 640, and the sixth organic layer 666 of the third intermediate organic layer 660 respectively contain a second compound 628 represented by one of Formulas 2-1 to 2-3, a fifth compound 648 represented by one of Formulas 2-1 to 2-3, and an eighth compound 668 represented by one of Formulas 2-1 to 2-3, the second compound 628 contained in the second organic layer 626 of the first intermediate organic layer 620, the fifth compound 648 contained in the fourth organic layer 646 of the second intermediate organic layer 640, and the eighth compound 668 contained in the sixth organic layer 666 of the third intermediate organic layer 660 may be the same or different.

[0282] In the first intermediate organic layer 620, the thickness of the first organic layer 622 may be less than that of the second organic layer 626. In the second intermediate organic layer 640, the thickness of the third organic layer 642 may be less than that of the fourth organic layer 646. In the third intermediate organic layer 660, the thickness of the fifth organic layer 662 may be less than that of the sixth organic layer 666.

[0283] As shown above, in the OLED D4 of this disclosure, the first light-emitting portion 610 includes a first intermediate organic layer 620 disposed on a first EML 618 and including a first organic layer 622 and a second organic layer 624; the second light-emitting portion 630 includes a second intermediate organic layer 640 disposed on a second EML 636 and including a third organic layer 642 and a fourth organic layer 646; and the third light-emitting portion 650 includes a third intermediate organic layer 660 disposed on a third EML 656 and including a fifth organic layer 662 and a sixth organic layer 666. In this case, at least one of the first organic layer 622 in the first intermediate organic layer 620, the third organic layer 642 in the second intermediate organic layer 640, and the fifth organic layer 662 in the third intermediate organic layer 660 contains a compound represented by Formula 1-1. Therefore, the on-state voltage and driving voltage of the OLED D4 are reduced, giving the OLED D4 and the organic light-emitting display device 400 including the OLED D4 the advantages of reduced power consumption, improved luminous efficiency, and increased lifetime.

[0284] Furthermore, since at least one of the second organic layer 626 in the first intermediate organic layer 620, the fourth organic layer 646 in the second intermediate organic layer 640, and the sixth organic layer 666 in the third intermediate organic layer 660 contains a compound represented by one of Formulas 2-1 to 2-3, the OLED D4 and the organic light-emitting display device 400 including the OLED D4 have significant advantages in reducing power consumption, improving luminous efficiency, and increasing lifespan.

[0285] Furthermore, since at least one of the second organic layer 626 in the first intermediate organic layer 620, the fourth organic layer 646 in the second intermediate organic layer 640, and the sixth organic layer 666 in the third intermediate organic layer 660 further comprises a third compound that is a Li derivative, the characteristics of the OLED D4 and the organic light-emitting display device 400 including the OLED D4 are further improved.

[0286] Furthermore, since the OLED D4 has a series structure and includes intermediate organic layers 620, 640 and 660, the luminous efficiency of the OLED D4 and the organic light-emitting display device 400 including the OLED D4 is significantly improved while preventing or minimizing the increase in driving voltage.

[0287] In the organic light-emitting display device 400, OLEDs D4 in the first pixel region P1, the second pixel region P2, and the third pixel region P3 emit white light, and the white light passes through the first color filter layer 422, the second color filter layer 424, and the third color filter layer 426. Therefore, red, green, and blue are displayed in the first pixel region P1, the second pixel region P2, and the third pixel region P3, respectively.

[0288] exist Figure 7 In this design, OLED D4 includes a second EML 636 and two EMLs, a first EML 618 and a third EML 656, each a blue EML, giving OLED D4 a three-layer structure. Alternatively, one of the first EML 618 and the third EML 656 can be omitted, allowing OLED D4 to have a two-layer structure.

[0289] It will be apparent to those skilled in the art that various modifications and variations may be made to this disclosure without departing from its spirit or scope. Therefore, this disclosure is intended to cover modifications and variations thereof, provided they fall within the scope of the appended claims and their equivalents.

Claims

1. An organic light-emitting diode, comprising: First electrode; The second electrode facing the first electrode; A first light-emitting material layer between the first electrode and the second electrode; and A first intermediate organic layer is located between the first luminescent material layer and the second electrode, and includes a first organic layer and a second organic layer between the first organic layer and the second electrode. The first organic layer contains a first compound. The first compound is one of the compounds in Formula 1-2: [Equation 1-2] 。 2. The organic light-emitting diode according to claim 1, wherein the second organic layer comprises a second compound represented by one of formulas 2-1 to 2-3: [Equation 2-1] ， [Equation 2-2] ,and [Equation 2-3] ， In Formula 2-1, two of Ar11 to Ar13 are independently selected from substituted or unsubstituted C6 to C30 aryl groups, and the third is selected from substituted or unsubstituted C5 to C30 heteroaryl-substituted C6 to C30 aryl groups and substituted or unsubstituted C5 to C30 heteroaryl groups. In Formula 2-2, Ar21 and Ar22 are each independently selected from substituted or unsubstituted C6 to C30 aryl groups, and Ar23 is selected from unsubstituted or C5 to C30 heteroaryl groups and substituted or unsubstituted C5 to C30 heteroaryl groups. In Formulas 2-3, Ar31 and Ar32 are each independently selected from hydrogen, substituted or unsubstituted C6 to C30 aryl groups and substituted or unsubstituted C5 to C30 heteroaryl groups, and Ar33 and Ar34 are each independently selected from substituted or unsubstituted C6 to C30 aryl groups and substituted or unsubstituted C5 to C30 heteroaryl groups.

3. The organic light-emitting diode according to claim 2, wherein the second compound is one of the compounds in formulas 2-4: [Equation 2-4] 。 4. The organic light-emitting diode according to claim 2, wherein the second organic layer further comprises a third compound that is a Li derivative.

5. The organic light-emitting diode according to claim 4, wherein the volume percentage of the third compound is 10 to 200 relative to the second compound.

6. The organic light-emitting diode according to claim 1, further comprising: A second light-emitting material layer between the first intermediate organic layer and the second electrode; and A second intermediate organic layer, situated between the second luminescent material layer and the second electrode, and comprising a third organic layer and a fourth organic layer situated between the third organic layer and the second electrode. The third organic layer contains a fourth compound represented by formula 1-2.

7. The organic light-emitting diode of claim 6, wherein the fourth organic layer comprises a fifth compound represented by one of formulas 2-1 to 2-3.

8. The organic light-emitting diode according to claim 7, wherein the fourth organic layer further comprises a sixth compound being a Li derivative.

9. The organic light-emitting diode according to claim 8, wherein the volume percentage of the sixth compound is 10 to 200 relative to the fifth compound.

10. The organic light-emitting diode according to claim 6, wherein the difference between the emission wavelength range of the first light-emitting material layer and the emission wavelength range of the second light-emitting material layer is 0 nm to 20 nm.

11. The organic light-emitting diode according to claim 6, wherein one of the first light-emitting material layer and the second light-emitting material layer is a blue light-emitting material layer, and the other of the first light-emitting material layer and the second light-emitting material layer includes a red light-emitting material layer and / or a green light-emitting material layer.

12. The organic light-emitting diode according to claim 6, further comprising: A third light-emitting material layer between the second intermediate organic layer and the second electrode; and A third intermediate organic layer, situated between the third luminescent material layer and the second electrode, and comprising a fifth organic layer and a sixth organic layer situated between the fifth organic layer and the second electrode. The fifth organic layer contains a seventh compound represented by formula 1-2.

13. The organic light-emitting diode of claim 12, wherein the sixth organic layer comprises an eighth compound represented by one of formulas 2-1 to 2-3.

14. The organic light-emitting diode according to claim 13, wherein the sixth organic layer further comprises a ninth compound being a Li derivative.

15. The organic light-emitting diode of claim 14, wherein the volume percentage of the ninth compound is 10 to 200 relative to the eighth compound.

16. The organic light-emitting diode of claim 12, wherein one of the first light-emitting material layer to the third light-emitting material layer is a red light-emitting material layer, and the other of the first light-emitting material layer to the third light-emitting material layer is a green light-emitting material layer, and wherein the remainder of the first light-emitting material layer to the third light-emitting material layer is a blue light-emitting material layer.

17. The organic light-emitting diode of claim 12, wherein two of the first to third light-emitting material layers are blue light-emitting material layers, and the remainder of the first to third light-emitting material layers includes a red light-emitting material layer and a green light-emitting material layer.

18. An organic light-emitting device, comprising: substrate; and An organic light-emitting diode positioned above the substrate, the organic light-emitting diode comprising: First electrode; The second electrode facing the first electrode; A first light-emitting material layer between the first electrode and the second electrode; and A first intermediate organic layer is located between the first luminescent material layer and the second electrode, and includes a first organic layer and a second organic layer between the first organic layer and the second electrode. The first organic layer contains a first compound. The first compound is one of the compounds in Formula 1-2: [Equation 1-2] 。 19. The organic light-emitting device according to claim 18, further comprising: A color filter layer between the substrate and the organic light-emitting diode or above the organic light-emitting diode. The substrate is defined with red pixel regions, green pixel regions, and blue pixel regions. The organic light-emitting diodes (OLEDs) correspond to each of the red pixel region, the green pixel region, and the blue pixel region, and The color filter layer corresponds to each of the red pixel region, the green pixel region, and the blue pixel region.

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