Organic light-emitting device comprising an organometallic compound and multiple host materials

Abstract

To provide an organic light emitting element in which an organometallic compound and multiple host materials are applied to an organic light emitting layer, which can improve a drive voltage, efficiency and a lifetime.SOLUTION: It has a light emitting layer 160 that includes a dopant substance 160' containing a specific organometallic compound, a host substance 160'' that is a specific compound, and another host substance 160''' that is another specific compound.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an organic light-emitting device comprising an organometallic compound and a plurality of host materials. [Background technology]

[0002] 2. Description of the Related Art Display devices are gaining increasing attention as they are applied to various fields. As one of the display devices, the technology of organic light emitting display devices including organic light emitting diodes (OLEDs) is rapidly developing.

[0003] An organic light-emitting device is a device in which, when electric charges are injected into an emissive layer formed between a positive electrode and a negative electrode, electrons and holes combine to form excitons, which then emit the exciton energy as light.Compared to existing display technologies, organic light-emitting diodes can be driven at a lower voltage, consume less power, and have excellent color reproduction.They also have the advantage of being applicable to flexible substrates, making them versatile and allowing the size of display devices to be freely adjusted.

[0004] Organic light emitting diodes (OLEDs) have superior viewing angles and brightness ratios compared to liquid crystal displays (LCDs), do not require backlighting, and are lightweight and ultra-thin. Organic light emitting devices are formed by arranging multiple organic layers, such as a hole injection layer, a hole transport layer, a hole transport auxiliary layer, an electron blocking layer, a light emitting layer, and an electron transport layer, between a negative electrode (electron injection electrode; cathode) and a positive electrode (hole injection electrode; anode).

[0005] In the structure of these organic light-emitting devices, when a voltage is applied between the two electrodes, electrons and holes are injected from the negative and positive electrodes, respectively, and excitons generated in the light-emitting layer emit light as they fall to the ground state.

[0006] Organic materials used in organic light-emitting devices can be broadly classified into emissive materials and charge transport materials. Emitting materials are an important factor in determining the luminous efficiency of organic light-emitting devices. They must have high quantum efficiency and excellent electron and hole mobility, and must be uniformly and stably present in the emitting layer. Emitting materials are classified into blue, red, green, and other emitting materials depending on the color they emit. Color-emitting materials are used as hosts or dopants to increase color purity and luminous efficiency through energy transfer.

[0007] In the case of fluorescent materials, only about 25% of the excitons formed in the light-emitting layer (singlet) are used to generate light, and the remaining 75% (triplet) are mostly lost to heat. In contrast, phosphorescent materials have a light-emitting mechanism that converts both singlet and triplet excitons into light.

[0008] To date, organometallic compounds have been used as phosphorescent materials in organic light-emitting devices. To improve the efficiency and lifetime of existing organic light-emitting devices, there remains a technical need to improve the performance of organic light-emitting devices by deriving highly efficient phosphorescent dopant materials and applying hosts with optimal optical properties. Summary of the Invention [Problem to be solved by the invention]

[0009] SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an organic light-emitting device in which an organometallic compound and a plurality of host materials are applied to an organic light-emitting layer, which can improve driving voltage, efficiency, and lifespan.

[0010] The objects of the present invention are not limited to those mentioned above, and other unmentioned objects and advantages of the present invention can be understood from the following description and can be more clearly understood from the examples of the present invention. Furthermore, it will be easily understood that the objects and advantages of the present invention can be achieved by the means and combinations thereof set forth in the claims. [Means for solving the problem]

[0011] In order to achieve the above object, the present invention provides an organic light-emitting device including: a first electrode; a second electrode facing the first electrode; and an organic layer disposed between the first electrode and the second electrode; wherein the organic layer includes an emitting layer, the emitting layer includes a dopant material and a host material, the dopant material includes an organometallic compound represented by Chemical Formula 1 below, and the host material includes a compound represented by Chemical Formula 2 below and a compound represented by Chemical Formula 3 below.

[0012] [ka]

[0013] In the above formula 1, X may be one selected from the group consisting of oxygen (O), sulfur (S) and selenium (Se); X1, X2, and X3 may each independently be nitrogen (N) or CR'; R1, R2, R3, R4, R7, R8, and R' may each independently be one selected from the group consisting of hydrogen, deuterium, halogen, halide, alkyl group, cycloalkyl group, heteroalkyl group, arylalkyl group, alkoxy group, aryloxy group, amino group, silyl group, alkenyl group, cycloalkenyl group, heteroalkenyl group, alkynyl group, aryl group, heteroaryl group, acyl group, carbonyl group, carboxylic acid group, ester group, nitrile group, isonitrile group, sulfanyl group, sulfinyl group, sulfonyl group, phosphino group, and combinations thereof, wherein at least one of the hydrogen atoms of R1, R2, R3, R4, R7, R8, and R' may be substituted with deuterium; R5 and R6 are each independently one selected from the group consisting of halogen, halide, alkyl group, cycloalkyl group, heteroalkyl group, arylalkyl group, alkoxy group, aryloxy group, amino group, silyl group, alkenyl group, cycloalkenyl group, heteroalkenyl group, alkynyl group, aryl group, heteroaryl group, acyl group, carbonyl group, carboxylic acid group, ester group, nitrile group, isonitrile group, sulfanyl group, sulfinyl group, sulfonyl group, phosphino group, and combinations thereof, wherein one or more hydrogen atoms of R5 and R6 may be substituted with deuterium; n may be a constant from 0 to 2; p, q, and w are independently constants from 1 to 4;

[0014] [ka]

[0015] In the above formula 2, R a and R b may be one selected from the group consisting of a C3-C40 monocyclic aryl group, a polycyclic aryl group, a monocyclic heteroaryl group, and a polycyclic heteroaryl group, a and R b and each C3-C40 aryl group can be independently substituted with one or more substituents selected from the group consisting of an alkyl group, an aryl group, a heteroaryl group, a cyano group, an alkylsilyl group, and an arylsilyl group; R c and R d may each be one selected from the group consisting of hydrogen, deuterium, halogen, cyano group, and alkyl group, r and s are each independently a constant from 0 to 7, and when r is 2 or more, R c may be the same or different, and when s is 2 or more, R d may be the same or different from each other,

[0016] [ka]

[0017] In the above formula 3, N-Het may be a substituted or unsubstituted monocyclic or polycyclic heteroaryl group containing one or more N; L may be one selected from the group consisting of a single bond; a substituted or unsubstituted C6-C60 arylene group; and a substituted or unsubstituted C2-C60 heteroarylene group; g may be a constant of 1 to 3, and when g is 2 or more, L may be the same or different from each other; R9~R 18 each independently may be one selected from the group consisting of hydrogen; deuterium; halogen; cyano group; substituted or unsubstituted C1-C60 alkyl group; substituted or unsubstituted C2-C60 alkenyl group; substituted or unsubstituted C2-C60 alkynyl group; substituted or unsubstituted C2-C60 alkoxy group; substituted or unsubstituted C3-C60 cycloalkyl group; substituted or unsubstituted C2-C60 heterocycloalkyl group; substituted or unsubstituted C6-C60 aryl group; substituted or unsubstituted C2-C60 heteroaryl group; substituted or unsubstituted phosphine oxide group; and substituted or unsubstituted amine group; R9~R 18 two or more adjacent groups may be bonded to each other to form a substituted or unsubstituted C6-C60 aryl group or a substituted or unsubstituted C2-C60 heteroaryl group; h and i may each be a constant of 0 to 3, and when h is 2 or more, R 17 may be the same or different, and when i is 2 or more, R 18 may be the same as or different from each other.

[0018] The organic light emitting device according to the present invention uses an organometallic compound represented by Chemical Formula 1 as a phosphorescent dopant, and a mixture of a compound represented by Chemical Formula 2 and a compound represented by Chemical Formula 3 as a phosphorescent host, thereby improving the driving voltage, efficiency, and lifespan of the organic light emitting device and achieving low power consumption.

[0019] The effects of this specification are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those having ordinary skill in the technical field to which the present invention pertains from the description below. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a cross-sectional view schematically illustrating an organic light emitting device according to an embodiment of the present invention. [Figure 2] 1 is a cross-sectional view schematically illustrating an organic light emitting device having a tandem structure including two light emitting portions according to an embodiment of the present invention. [Figure 3] 1 is a cross-sectional view schematically illustrating an organic light emitting device having a tandem structure and including three light emitting units according to an embodiment of the present invention. [Figure 4] 1 is a cross-sectional view schematically illustrating an organic light emitting display device to which an organic light emitting device according to an exemplary embodiment of the present invention is applied; DETAILED DESCRIPTION OF THE INVENTION

[0021] The above-mentioned objects, features, and advantages will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can easily implement the technical concept of the present invention. In describing the present invention, if a detailed description of known technologies relating to the present invention is deemed to obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings are used to indicate the same or similar components.

[0022] In describing this specification, if a detailed description of related publicly known technology is deemed to obscure the gist of this specification, that detailed description will be omitted.

[0023] In this specification, when an element is described as "comprising," "having," "consisting," "disposed," or "comprising," other parts can be added unless "only" is used. When an element is referred to in the singular, it also includes the plural unless expressly stated otherwise.

[0024] When interpreting the elements in this specification, unless otherwise expressly stated, they are to be interpreted as including a margin of error.

[0025] In this specification, when an arbitrary structure is arranged "on (or under)" a component or "above (or below)" a component, it means that the arbitrary structure is arranged in contact with the upper surface (or lower surface) of the component, and that other structures may be interposed between the component and the arbitrary structure arranged above (or below) the component.

[0026] The term "halo" or "halogen" as used herein includes fluorine, chlorine, bromine, and iodine.

[0027] As used herein, the term "alkyl group" refers to both straight-chain and branched-chain alkyl radicals. Unless otherwise specified, alkyl groups contain 1 to 20 carbon atoms and include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, and the like, and further, alkyl groups can be optionally substituted.

[0028] As used herein, the term "cycloalkyl group" refers to a cyclic alkyl radical. Unless otherwise specified, cycloalkyl groups contain 3 to 20 carbon atoms and include cyclopropyl, cyclopentyl, cyclohexyl, and the like, and further include cycloalkyl groups that can be optionally substituted.

[0029] As used herein, the term "alkenyl group" refers to both straight-chain and branched-chain alkene radicals. Unless otherwise specified, alkenyl groups contain 2 to 20 carbon atoms, and further, alkenyl groups can be optionally substituted.

[0030] As used herein, the term "cycloalkenyl group" refers to a cyclic alkene radical. Unless otherwise specified, cycloalkenyl groups contain 3 to 20 carbon atoms, and further, cycloalkenyl groups can be optionally substituted.

[0031] As used herein, the term "alkynyl group" refers to both straight-chain and branched-chain alkyne radicals. Unless otherwise specified, alkynyl groups contain 2 to 20 carbon atoms. Furthermore, alkynyl groups can be optionally substituted.

[0032] As used herein, the terms "aralkyl group" or "arylalkyl group" are used interchangeably and refer to an alkyl group having an aromatic group as a substituent, and further the alkylaryl group may be optionally substituted.

[0033] As used herein, the terms "aryl group" and "aromatic group" are used interchangeably, and aryl groups include both monocyclic and polycyclic groups. Polycyclic groups may include "fused rings," which are two or more rings in which two adjacent carbon atoms are common to both rings. Unless otherwise specified, aryl groups contain 6 to 60 carbon atoms, and further, aryl groups can be optionally substituted.

[0034] The term "heterocyclic group" as used herein means an aryl group, a cycloalkyl group, or an aralkyl group (arylalkyl group) in which one or more carbon atoms constituting the group are substituted with a heteroatom such as oxygen (O), nitrogen (N), or sulfur (S), and the heterocycle can be optionally substituted.

[0035] Unless otherwise specified, the term "carbon ring" used in this specification can be used to include both a "cycloalkyl group" which is a ring group and an "aryl group (aromatic group)" which is an aromatic ring group.

[0036] As used herein, the terms "heteroalkyl group" and "heteroalkenyl group" refer to groups in which one or more of the carbon atoms constituting the group have been substituted with a heteroatom such as oxygen (O), nitrogen (N), or sulfur (S), and the heteroalkyl group and heteroalkenyl group can be optionally substituted.

[0037] As used herein, the term "substituted" means that a substituent other than hydrogen (H) is bonded to the carbon, and the substituent may be one selected from hydrogen, halogen, cyano, alkyl, alkoxy, fluoroalkoxy, heteroaryl, heterocyclyl, alkylheterocyclyl, -NH, -NH(alkyl), -N(alkyl), -NHC(O)(alkyl), -S(alkyl), -SONH, -SONH(alkyl), -SON(alkyl), -SONH(cycloalkyl), -SON(cycloalkyl), -C(O)NH, -C(O)NH(alkyl), -C(O)N(alkyl), -O-(heterocyclyl), -O-(heterocyclyl)-alkylaryl, -SONH(cycloalkyl), and -CO(alkyl).

[0038] Unless otherwise defined herein, substituents with an undefined carbon number may contain up to 60 carbon atoms, with the minimum number of carbon atoms contained within each substituent being as known.

[0039] Each object and substituent defined herein may be the same or different unless otherwise specified.

[0040] The structure of the organometallic compound according to the present invention and the organic light-emitting device containing the same will be described in detail below.

[0041] Conventionally, organometallic compounds have been used as dopants in phosphorescent light-emitting layers, and 2-phenylpyridine is known as a typical ligand structure for organometallic compounds. However, these conventional light-emitting dopants have limitations in improving the efficiency and lifetime of organic light-emitting devices, necessitating the development of new light-emitting dopant materials. Experiments have confirmed that by mixing a hole transport host and an electron transport host as host materials with the dopant material, the efficiency and lifetime of organic light-emitting devices can be further increased, and the driving voltage can be reduced, thereby improving the properties of the organic light-emitting devices. This has led to the completion of the present invention.

[0042] 1 , an organic light emitting device 100 may be provided that includes a first electrode 110, a second electrode 120 facing the first electrode 110, and an organic layer 130 disposed between the first electrode 110 and the second electrode 120. The organic layer 130 may include an emitting layer 160, which may include a dopant material 160′ and a host material 160″, 160′″. The dopant material may include an organometallic compound 160′ represented by Chemical Formula 1 below. The host material may include a two-host mixture of a hole-transporting host compound 160″ represented by Chemical Formula 2 below and an electron-transporting host compound 160′″ represented by Chemical Formula 3 below.

[0043] [ka]

[0044] In the above formula 1, X may be one selected from the group consisting of oxygen (O), sulfur (S) and selenium (Se); X1, X2, and X3 may each independently be nitrogen (N) or CR'; R1, R2, R3, R4, R7, R8, and R' may each independently be one selected from the group consisting of hydrogen, deuterium, halogen, halide, alkyl group, cycloalkyl group, heteroalkyl group, arylalkyl group, alkoxy group, aryloxy group, amino group, silyl group, alkenyl group, cycloalkenyl group, heteroalkenyl group, alkynyl group, aryl group, heteroaryl group, acyl group, carbonyl group, carboxylic acid group, ester group, nitrile group, isonitrile group, sulfanyl group, sulfinyl group, sulfonyl group, phosphino group, and combinations thereof, wherein at least one of the hydrogen atoms of R1, R2, R3, R4, R7, R8, and R' may be substituted with deuterium; R5 and R6 are each independently one selected from the group consisting of halogen, halide, alkyl group, cycloalkyl group, heteroalkyl group, arylalkyl group, alkoxy group, aryloxy group, amino group, silyl group, alkenyl group, cycloalkenyl group, heteroalkenyl group, alkynyl group, aryl group, heteroaryl group, acyl group, carbonyl group, carboxylic acid group, ester group, nitrile group, isonitrile group, sulfanyl group, sulfinyl group, sulfonyl group, phosphino group, and combinations thereof, wherein one or more hydrogen atoms of R5 and R6 may be substituted with deuterium; n may be a constant from 0 to 2; p, q, and w are independently constants from 1 to 4;

[0045] [ka]

[0046] In the above formula 2, R a and R b may be one selected from the group consisting of a C3-C40 monocyclic aryl group, a polycyclic aryl group, a monocyclic heteroaryl group, and a polycyclic heteroaryl group, a and R band each C3-C40 aryl group can be independently substituted with one or more substituents selected from the group consisting of an alkyl group, an aryl group, a heteroaryl group, a cyano group, an alkylsilyl group, and an arylsilyl group; R c and R d may each independently be one selected from the group consisting of hydrogen, deuterium, halogen, cyano group, and alkyl group, r and s are each independently a constant from 0 to 7, and when r is 2 or greater, R c may be the same or different, and when s is 2 or more, R d may be the same or different from each other,

[0047] [ka]

[0048] In the above formula 3, N-Het may be a substituted or unsubstituted monocyclic or polycyclic heteroaryl group containing one or more N; L may be one selected from the group consisting of a single bond; a substituted or unsubstituted C6-C60 arylene group; and a substituted or unsubstituted C2-C60 heteroarylene group; g may be a constant of 1 to 3, and when g is 2 or more, L may be the same or different from each other; R9~R 18 each independently may be one selected from the group consisting of hydrogen; deuterium; halogen; cyano group; substituted or unsubstituted C1-C60 alkyl group; substituted or unsubstituted C2-C60 alkenyl group; substituted or unsubstituted C2-C60 alkynyl group; substituted or unsubstituted C2-C60 alkoxy group; substituted or unsubstituted C3-C60 cycloalkyl group; substituted or unsubstituted C2-C60 heterocycloalkyl group; substituted or unsubstituted C6-C60 aryl group; substituted or unsubstituted C2-C60 heteroaryl group; substituted or unsubstituted phosphine oxide group; and substituted or unsubstituted amine group; R9~R 18 two or more adjacent groups may be bonded to each other to form a substituted or unsubstituted C6-C60 aryl group or a substituted or unsubstituted C2-C60 heteroaryl group; h and i may each be a constant of 0 to 3, and when h is 2 or more, R 17 may be the same or different, and when i is 2 or more, R 18 may be the same as or different from each other.

[0049] In this specification, the organometallic compound represented by Chemical Formula 1, the compound represented by Chemical Formula 2, and the compound represented by Chemical Formula 3 may each include a case in which some or all of the hydrogen atoms are substituted with deuterium.

[0050] According to one embodiment of the present invention, the organometallic compound represented by Chemical Formula 1 may have a homoleptic or heteroleptic structure, for example, a homoleptic structure in which n in Chemical Formula 1 is 0; a heteroleptic structure in which n is 1; or a heteroleptic structure in which n is 2; for example, n may be 2.

[0051] According to one embodiment of the present invention, X in the above formula 1 may be, for example, oxygen (O).

[0052] According to one embodiment of the present invention, the organometallic compound represented by Chemical Formula 1 above may be one selected from the group consisting of Compounds GD-1 to GD-10 below, but is not limited thereto as long as it falls within the definition of Chemical Formula 1 above.

[0053] TIFF0007777574000007.tif151170

[0054] According to one embodiment of the present invention, R a and R b R may be a C3-C40 monocyclic or polycyclic aryl or heteroaryl group.a and R b Each of the C3-C40 aryl groups represented by the formula (I) can be independently substituted with one or more substituents selected from the group consisting of an alkyl group, an aryl group, a cyano group, an alkylsilyl group, and an arylsilyl group.

[0055] According to one embodiment of the present invention, R a and R b The C3-C40 aryl groups represented by the formula (I) may each independently be one selected from the group consisting of a phenyl group, a naphthyl group, an anthracene group (a monovalent radical derived from anthracene), a chrysene group (a monovalent radical derived from chrysene), a pyrene group (a monovalent radical derived from pyrene), a phenanthrene group (a monovalent radical derived from phenanthrene), a triphenylene group (a monovalent radical derived from triphenylene), a fluorene group (a monovalent radical derived from fluorene), and a 9,9'-spirofluorene group (a monovalent radical derived from 9,9'-spirofluorene).

[0056] According to one embodiment of the present invention, R c and R d may each independently be one selected from the group consisting of hydrogen, deuterium, halogen, cyano group, and alkyl group, which may be the same or different from each other, and preferably, R c and R d may both be hydrogen.

[0057] According to one embodiment of the present invention, the organometallic compound represented by Chemical Formula 2 above may be one selected from the group consisting of Compounds GHH-1 to GHH-20 below, but is not limited thereto as long as it falls within the definition of Chemical Formula 2 above.

[0058] TIFF0007777574000008.tif195170TIFF0007777574000009.tif184170TIFF0007777574000010.tif64170

[0059] According to one embodiment of the present invention, N-Het in the above formula (3) may be a substituted or unsubstituted triazine (a monovalent radical derived from triazine).

[0060] According to one embodiment of the present invention, N-Het in the above formula (3) is a substituent selected from the group consisting of a phenyl group, a biphenyl group, and a naphthyl group, and may be a mono- or di-substituted triazinyl.

[0061] According to one embodiment of the present invention, L in the above formula 3 may be a single bond.

[0062] According to one embodiment of the present invention, the organometallic compound represented by Chemical Formula 3 above may be one selected from the group consisting of the following compounds GEH-1 to GEH-20, but is not limited thereto as long as it falls within the definition of Chemical Formula 3 above.

[0063] TIFF0007777574000011.tif255170TIFF0007777574000012.tif158170TIFF0007777574000013.tif165170

[0064] In addition, in the organic light emitting device 100, the organic layer 130 disposed between the first electrode 110 and the second electrode 120 may have a structure including, in order from the first electrode 110, a hole injection layer 140 (HIL), a hole transfer layer 150 (HTL), an emission layer 160 (EML), an electron transfer layer 170 (ETL), and an electron injection layer 180 (EIL). The second electrode 120 may be formed on the electron injection layer 180, and a protective film (not shown) may be formed thereon.

[0065] 1, a hole transport auxiliary layer may be further added between the hole transport layer 150 and the light emitting layer 160. The hole transport auxiliary layer includes a compound with good hole transport properties and reduces the HOMO energy level difference between the hole transport layer 150 and the light emitting layer 160, thereby adjusting the hole injection characteristics and reducing hole accumulation at the interface between the hole transport auxiliary layer and the light emitting layer 160. This reduces quenching, which is the annihilation of excitons due to polarons at the interface. This reduces degradation of the device, stabilizes the device, and improves its efficiency and lifespan.

[0066] The first electrode 110 may be a positive electrode and may be made of a conductive material having a relatively large work function, such as ITO, IZO, tin oxide, or zinc oxide, but is not limited thereto.

[0067] The second electrode 120 may be a negative electrode and may include, but is not limited to, Al, Mg, Ca, Ag, or alloys or combinations thereof, which are conductive materials with relatively low work function values.

[0068] The hole injection layer 140 may be located between the first electrode 110 and the hole transport layer 150. The hole injection layer 140 functions to improve the interfacial properties between the first electrode 110 and the hole transport layer 150 and may be selected from materials having appropriate conductivity. The hole injection layer 140 may contain a compound such as MTDATA, CuPc, TCTA, HATCN, TDAPB, PEDOT / PSS, or N1,N1'-([1,1'-biphenyl]-4,4'-diyl)bis(N1,N4,N4-triphenylbenzene-1,4-diamine), preferably, but not limited to, N1,N1'-([1,1'-biphenyl]-4,4'-diyl)bis(N1,N4,N4-triphenylbenzene-1,4-diamine).

[0069] The hole transport layer 150 is located adjacent to the light emitting layer between the first electrode 110 and the light emitting layer 160. The hole transport layer 150 may contain a compound such as TPD, NPB, CBP, N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine, N-(biphenyl-4-yl)-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)biphenyl)-4-amine, and preferably, NPB, but is not limited to this.

[0070] According to an embodiment of the present invention, the light-emitting layer 160 may be formed by doping an organometallic compound represented by Chemical Formula 1 with a dopant 160′ to improve the luminous efficiency of the host 160″, 160′″, and the dopant 160′ may be a material that emits green or red light, and preferably a green phosphorescent material.

[0071] According to an embodiment of the present invention, the doping concentration of the dopant 160′ may be adjusted within a range of 1 to 30 wt % based on the total weight of the two hosts 160″ and 160′″. Although not limited thereto, the doping concentration may be, for example, 2 to 20 wt %, for example, 3 to 15 wt %, for example, 5 to 10 wt %, for example, 3 to 8 wt %, for example, 2 to 7 wt %, for example, 5 to 7 wt %, or for example, 5 to 6 wt %.

[0072] According to an embodiment of the present invention, the mixing ratio of the two hosts 160'', 160''', is not particularly limited. The host 160'', which is a compound represented by Chemical Formula 2, has hole transport properties, and the host 160'', which is a compound represented by Chemical Formula 3, has electron transport properties. Therefore, mixing the two hosts can advantageously improve the lifetime characteristics, and the mixing ratio of the two hosts can be appropriately adjusted. Therefore, the mixing ratio of the two hosts, which is a mixture of the compound represented by Chemical Formula 2 and the compound represented by Chemical Formula 3, is not particularly limited. The ratio (by weight) of the compound represented by Chemical Formula 2 to the compound represented by Chemical Formula 3 may be, for example, 1:9 to 9:1, for example, 2:8, for example, 3:7, for example, 4:6, for example, 5:5, for example, 6:4, for example, 7:3, or for example, 8:2.

[0073] Furthermore, an electron transport layer 170 and an electron injection layer 180 may be sequentially stacked between the light-emitting layer 160 and the second electrode 120. The material of the electron transport layer 170 is required to have high electron mobility, and smooth electron transport enables a stable supply of electrons to the light-emitting layer.

[0074] For example, the material of the electron transport layer 170 is one used in the art, such as Alq3 (tris(8-hydroxyquinolino)aluminum), Liq (8-hydroxyquinolinolatolithium), PBD (2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4oxadiazole), TAZ (3-(4-biphenyl)4-phenyl-5-tert-butylphenyl-1,2,4-triazole), spiro-PBD, BAlq (bis(2-methyl-8-quinolinolate)-4-(phenylphenolato)aluminum), SAlq, TPBi(2,2',2-(1,3,5-benzinetriyl)-tri The compound may include a compound such as s(1-phenyl-1-H-benzimidazole), oxadiazole, triazole, phenanthroline, benzoxazole, benzothiazole, or 2-(4-(9,10-di(naphthalen-2-yl)anthracen-2-yl)phenyl)-1-phenyl-1H-benzo[d]imidazole, and preferably includes 2-(4-(9,10-di(naphthalen-2-yl)anthracen-2-yl)phenyl)-1-phenyl-1H-benzo[d]imidazole, but is not limited thereto.

[0075] The electron injection layer 180 facilitates electron injection and may be made of any material commonly used in the art, including, but not limited to, compounds such as Alq3 (tris(8-hydroxyquinolino)aluminum), PBD, TAZ, spiro-PBD, BAlq, and SAlq. Alternatively, the electron injection layer 180 may be made of a metal compound, including, but not limited to, Liq, LiF, NaF, KF, RbF, CsF, FrF, BeF2, MgF2, CaF2, SrF2, BaF2, and RaF2.

[0076] The organic light emitting device of the present invention may be a white organic light emitting device having a tandem structure. In the case of a tandem organic light emitting device according to an embodiment of the present invention, two or more single light emitting stacks (or light emitting portions) may be formed by connecting two or more single light emitting stacks (or light emitting portions) via a charge generation layer (CGL). The organic light emitting device may include a first electrode and a second electrode facing each other on a substrate, and two or more light emitting stacks (light emitting portions) having an emitting layer stacked between the first and second electrodes and emitting light of a specific wavelength band. The multiple light emitting stacks (light emitting portions) may be configured to emit the same color or different colors. Furthermore, one light emitting stack (light emitting portion) may also include one or more light emitting layers, and the multiple light emitting layers may be the same or different colors.

[0077] In this case, one or more of the light-emitting layers included in the plurality of light-emitting units may contain, as a dopant material, the organometallic compound represented by Chemical Formula 1 according to the present invention. The plurality of light-emitting units in the tandem structure may be connected to a charge generation layer (CGL) consisting of an N-type charge generation layer and a P-type charge generation layer.

[0078] 2 and 3 are cross-sectional views schematically illustrating organic light emitting devices having a tandem structure each having two light emitting portions and three light emitting portions, respectively, according to illustrative embodiments of the present invention.

[0079] As shown in FIG. 2, the organic light emitting device 100 of the present invention includes a first electrode 110 and a second electrode 120 facing each other, and an organic layer 230 located between the first electrode 110 and the second electrode 120. The organic layer 230 includes a first light emitting portion (ST1) located between the first electrode 110 and the second electrode 120 and including a first light emitting layer 261, a second light emitting portion (ST2) located between the first light emitting portion (ST1) and the second electrode 120 and including a second light emitting layer 262, and a charge generation layer (CGL) located between the first and second light emitting portions (ST1 and ST2). The charge generation layer (CGL) may include an N-type charge generation layer 291 and a P-type charge generation layer 292. At least one of the first light emitting layer 261 and the second light emitting layer 262 may include an organometallic compound represented by Chemical Formula 1 according to the present invention as a dopant 262′. For example, as shown in FIG. 2, the second light-emitting layer 262 of the second light-emitting unit (ST2) may include a compound 262' represented by Chemical Formula 1 as a dopant, a compound 262" represented by Chemical Formula 2 as a hole-transporting host, and a compound 262'" represented by Chemical Formula 3 as an electron-transporting host. Although not shown in FIG. 2, each of the first and second light-emitting units (ST1 and ST2) may further include an additional light-emitting layer in addition to the first light-emitting layer 261 and the second light-emitting layer 262. The first hole-transporting layer 251 and the second hole-transporting layer 252 in FIG. 2 may be applied in the same or similar manner as described above for the hole-transporting layer 150 in FIG. 1. Furthermore, the first electron-transporting layer 271 and the second electron-transporting layer 272 in FIG. 2 may be applied in the same or similar manner as described above for the electron-transporting layer 170 in FIG. 1.

[0080] 3, the organic light emitting device 100 of the present invention includes a first electrode 110 and a second electrode 120 facing each other, and an organic layer 330 located between the first electrode 110 and the second electrode 120. The organic layer 330 includes a first light emitting portion (ST1) located between the first electrode 110 and the second electrode 120 and including a first light emitting layer 261; a second light emitting portion (ST2) including a second light emitting layer 262; a third light emitting portion (ST3) including a third light emitting layer 263; a first charge generation layer (CGL1) located between the first and second light emitting portions (ST1 and ST2); and a second charge generation layer (CGL2) located between the second and third light emitting portions (ST2 and ST3). The first and second charge generation layers (CGL1 and CGL2) may include N-type charge generation layers 291 and 293 and P-type charge generation layers 292 and 294, respectively. One or more of the first light-emitting layer 261, the second light-emitting layer 262, and the third light-emitting layer 263 may contain an organometallic compound represented by Chemical Formula 1 according to the present invention as a dopant. For example, as shown in FIG. 3, the second light-emitting layer 262 of the second light-emitting portion (ST2) may contain a compound 262' represented by Chemical Formula 1 as a dopant, a compound 262'' represented by Chemical Formula 2 as a hole-transporting host, and a compound 262''' represented by Chemical Formula 3 as an electron-transporting host. Although not shown in FIG. 3, each of the first, second, and third light-emitting portions (ST1, ST2, and ST3) may further include an additional light-emitting layer in addition to the first light-emitting layer 261, the second light-emitting layer 262, and the third light-emitting layer 263, and thus may be formed of a plurality of light-emitting layers. The first hole-transporting layer 251, the second hole-transporting layer 252, and the third hole-transporting layer 253 in FIG. 3 may be the same as or similar to the hole-transporting layer 150 in FIG. 1. 1. The first electron transport layer 271, the second electron transport layer 272, and the third electron transport layer 273 in FIG. 3 may be the same as or similar to the electron transport layer 170 in FIG.

[0081] Furthermore, the organic light emitting device according to an embodiment of the present invention may have a tandem structure in which four or more light emitting portions and three or more charge generating layers are disposed between the first electrode and the second electrode.

[0082] The organic light emitting device according to the present invention can be used in an organic light emitting display device, a lighting device using the organic light emitting device, etc. As an embodiment, Figure 4 is a cross-sectional view schematically illustrating an organic light emitting display device using the organic light emitting device according to an exemplary embodiment of the present invention.

[0083] 4, an organic light emitting display device 3000 may include a substrate 3010, an organic light emitting element 4000, and an encapsulation film 3900 covering the organic light emitting element 4000. A driving thin film transistor (Td) serving as a driving element and the organic light emitting element 4000 connected to the driving thin film transistor (Td) are located on the substrate 3010.

[0084] Although not explicitly shown in FIG. 4, the substrate 3010 further includes gate lines and data lines that intersect with each other to define pixel regions, power lines that extend parallel to and spaced apart from either the gate lines or the data lines, switching thin film transistors connected to the gate lines and the data lines, and storage capacitors connected to the power lines and one electrode of the switching thin film transistors.

[0085] The driving thin film transistor (Td) is connected to the switching thin film transistor and includes a semiconductor layer 3100, a gate electrode 3300, a source electrode 3520, and a drain electrode 3540.

[0086] The semiconductor layer 3100 is formed on the substrate 3010 and may be made of an oxide semiconductor material or polycrystalline silicon. When the semiconductor layer 3100 is made of an oxide semiconductor material, a light-shielding pattern (not shown) may be formed under the semiconductor layer 3100. The light-shielding pattern prevents light from entering the semiconductor layer 3100, thereby preventing deterioration of the semiconductor layer 3100 due to light. Alternatively, the semiconductor layer 3100 may be made of polycrystalline silicon, in which case both edges of the semiconductor layer 3100 may be doped with impurities.

[0087] On top of the semiconductor layer 3100, a gate insulating layer 3200 made of an insulating material is formed on the front surface of the substrate 3010. The gate insulating layer 3200 may be made of an inorganic insulating material such as silicon oxide or silicon nitride.

[0088] A gate electrode 3300 made of a conductive material such as metal is formed on the gate insulating layer 3200, corresponding to the center of the semiconductor layer 3100. The gate electrode 3300 is connected to a switching thin film transistor.

[0089] An interlayer insulating film 3400 made of an insulating material is formed on the front surface of the substrate 3010 above the gate electrode 3300. The interlayer insulating film 3400 may be made of an inorganic insulating material such as silicon oxide or silicon nitride, or an organic insulating material such as benzocyclobutene or photo-acryl.

[0090] The interlayer insulating film 3400 has first and second semiconductor layer contact holes 3420 and 3440 exposing both sides of the semiconductor layer 3100. The first and second semiconductor layer contact holes 3420 and 3440 are located on both sides of the gate electrode 3300 and spaced apart from the gate electrode 3300.

[0091] A source electrode 3520 and a drain electrode 3540 made of a conductive material such as metal are formed on the interlayer insulating film 3400. The source electrode 3520 and the drain electrode 3540 are spaced apart from each other around the gate electrode 3300 and contact both sides of the semiconductor layer 3100 through first and second semiconductor layer contact holes 3420 and 3440, respectively. The source electrode 3520 is connected to a power wiring (not shown).

[0092] The semiconductor layer 3100, the gate electrode 3300, the source electrode 3520, and the drain electrode 3540 constitute a driving thin film transistor (Td), and the driving thin film transistor (Td) has a coplanar structure in which the gate electrode 3300, the source electrode 3520, and the drain electrode 3540 are located on top of the semiconductor layer 3100.

[0093] Alternatively, the driving thin film transistor (Td) may have an inverted staggered structure in which a gate electrode is located below a semiconductor layer and a source electrode and a drain electrode are located above the semiconductor layer. In this case, the semiconductor layer may be made of amorphous silicon. Meanwhile, the switching thin film transistor (not shown) may have substantially the same structure as the driving thin film transistor (Td).

[0094] Meanwhile, the organic light emitting display device 3000 may include a color filter 3600 that absorbs light generated by the organic light emitting element 4000. For example, the color filter 3600 may absorb red (R), green (G), blue (B), and white (W) light. In this case, red, green, and blue color filter patterns that absorb light may be formed separately for each pixel region, and each color filter pattern may be disposed to overlap with an organic layer 4300 of the organic light emitting element 4000 that emits light in a wavelength band to be absorbed. By employing the color filter 3600, the organic light emitting display device 3000 may implement full color.

[0095] For example, if the organic light emitting display device 3000 is a bottom-emission type, the color filter 3600 that absorbs light may be located on the interlayer insulating film 3400 corresponding to the organic light emitting element 4000. In an exemplary embodiment, if the organic light emitting display device 3000 is a top-emission type, the color filter may be located on the organic light emitting element 4000, i.e., on the second electrode 4200. For example, the color filter 3600 may be formed to a thickness of 2 to 5 μm.

[0096] Meanwhile, a planarization layer 3700 having a drain contact hole 3720 exposing the drain electrode 3540 of the driving thin film transistor (Td) is formed covering the driving thin film transistor (Td).

[0097] On the planarization layer 3700, a first electrode 4100 connected to the drain electrode 3540 of the driving thin film transistor (Td) through the drain contact hole 3720 is formed separately for each pixel region.

[0098] The first electrode 4100 may be an anode and may be made of a conductive material with a relatively high work function, for example, a transparent conductive material such as ITO, IZO, or ZnO.

[0099] Meanwhile, when the organic light emitting display device 3000 is a top-emission type, a reflective electrode or a reflective layer may be further formed under the first electrode 4100. For example, the reflective electrode or the reflective layer may be made of aluminum (Al), silver (Ag), nickel (Ni), or an aluminum-palladium-copper (APC) alloy.

[0100] A bank layer 3800 is formed on the planarization layer 3700 to cover the edges of the first electrodes 4100. The bank layer 3800 exposes the centers of the first electrodes 4100 in correspondence with the pixel regions.

[0101] An organic layer 4300 is formed on the first electrode 4100, and if necessary, the organic light-emitting device 4000 may have a tandem structure. For the tandem structure, refer to Figures 2 to 4 showing exemplary embodiments of the present invention and the above description thereof.

[0102] A second electrode 4200 is formed on the substrate 3010 on which the organic layer 4300 is formed. The second electrode 4200 is located in front of the display area and is made of a conductive material with a relatively low work function, and can be used as a cathode. For example, the second electrode 4200 may be made of aluminum (Al), magnesium (Mg), or an aluminum-magnesium alloy (Al-Mg).

[0103] The first electrode 4100 , the organic layer 4300 and the second electrode 4200 form an organic light emitting element 4000 .

[0104] An encapsulation film 3900 is formed on second electrode 4200 to prevent external moisture from penetrating into organic light emitting device 4000. Although not explicitly shown in FIG. 4, encapsulation film 3900 may have a triple-layer structure in which a first inorganic layer, an organic layer, and an inorganic layer are sequentially stacked, but is not limited thereto.

[0105] The following examples of the present invention will be described. However, the following examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention.

[0106] Example 1 A glass substrate coated with a thin film of ITO (indium tin oxide) at a thickness of 1,000 Å was washed, then ultrasonically cleaned with a solvent such as isopropyl alcohol, acetone, or methanol, and then dried.

[0107] On the prepared ITO transparent electrode, HI-1 was thermally vacuum deposited to a thickness of 100 nm as a hole injection material, followed by HT-1 to a thickness of 350 nm as a hole transport material. The emissive layer then contained GD-1 as the dopant and a mixture of GHH-1 and GEH-1 (GHH-1:GEH-1 = 7:3, by weight) as the host. The dopant concentration was 10% and the emissive layer was 400 nm thick. Next, ET-1 and Liq compounds were thermally vacuum deposited as electron transport layer and electron injection layer materials, respectively, followed by deposition of 100 nm of aluminum to form the anode, completing the fabrication of an organic light-emitting device.

[0108] The materials used in Example 1 above are as follows: HI-1 is NPNPB, and ET-1 is ZADN.

[0109] TIFF0007777574000014.tif116170

[0110] Comparative Examples 1 to 5 and Examples 2 to 200 Organic light-emitting devices of Comparative Examples 1 to 5 and Examples 2 to 200 were fabricated in the same manner as in Example 1, except that the dopant materials and host materials used in Example 1 were those listed in Tables 1 to 15 below. In Comparative Examples 1 to 5, one type of CBP having the following structure was used as the host.

[0111] TIFF0007777574000015.tif37170

[0112] Experimental example The organic light emitting devices manufactured in Examples 1 to 200 and Comparative Examples 1 to 5 were connected to an external power supply, and the device characteristics were evaluated at room temperature using a current supply and a photometer.

[0113] Specifically, 10mA / cm 2 The driving voltage (V), external quantum efficiency (EQE;%) and life characteristics (LT95;%) were measured at a current of 100 Ω / s, and were calculated as relative values ​​to those of any of Comparative Examples 1 to 5. The results are shown in Tables 1 to 15 below.

[0114] LT95 lifetime is the time it takes for a display element to lose 5% of its initial brightness. LT95 is the most difficult customer specification to meet and determines whether a display will experience image burn-in.

[0115] [Table 1]

[0116] [Table 2]

[0117] [Table 3]

[0118] [Table 4]

[0119] [Table 5]

[0120] [Table 6]

[0121] [Table 7]

[0122] [Table 8]

[0123] [Table 9]

[0124] [Table 10]

[0125] [Table 11]

[0126] [Table 12]

[0127] [Table 13]

[0128] [Table 14]

[0129] [Table 15]

[0130] As can be seen from the results of Tables 1 to 15 above, the organic light-emitting devices in which the organometallic compound satisfying the structure represented by Chemical Formula 1 of the present invention used in Examples 1 to 200 was used as a dopant in the light-emitting layer, and a mixed material of the compound represented by Chemical Formula 2 and the compound represented by Chemical Formula 3 was used as a host, had lower driving voltages and improved external quantum efficiency (EQE) and lifetime (LT95) compared to the organic light-emitting devices in Comparative Examples 1 to 5 in which a single material was used as a host.

[0131] Although the embodiments of the present specification have been described in more detail above with reference to the accompanying drawings, the present specification is not necessarily limited to these embodiments, and various modifications may be made within the scope of the technical concept of the present specification. Therefore, the embodiments disclosed in the present specification are for illustrative purposes only, and do not limit the scope of the technical concept of the present specification. Therefore, the above-described embodiments should be understood to be illustrative in all respects and not limiting. The scope of protection of the present specification should be interpreted by the scope of the claims, and all technical concepts within the scope equivalent thereto should be interpreted as being included in the scope of the present specification. [Explanation of symbols]

[0132] 100,4000 organic light-emitting devices 110,4100 1st electrode 120,4200 2nd electrode 130,230,330,4300 organic layer 140 Hole injection layer 150 Hole transport layer 251 First hole transport layer 252 Second hole transport layer 253 Third hole transport layer 160 luminescent layer 261 First light-emitting layer 262 Second light-emitting layer 263 Third luminous layer 160',262' Dopant 160'', 262'' Hole transporting host 160''',262''' electron transport host 170 Electron transport layer 271 First hole transport layer 272 Second hole transport layer 273 Third hole transport layer 180 Electron injection layer 3000 Organic Light Emitting Display Device 3010 board 3100 Semiconductor layer 3200 Gate insulating film 3300 gate electrode 3400 Interlayer insulating film 3420 First semiconductor layer contact hole 3440 Second semiconductor layer contact hole 3520 Source Electrode 3540 Drain electrode 3600 color filters 3700 Planarization layer 3720 Drain contact hole 3800 bank layer 3900 Encapsulating Film

Claims

1. first electrode; a second electrode facing the first electrode; and an organic layer disposed between the first electrode and the second electrode; the organic layer includes an emitting layer, the emitting layer including a dopant material and a host material; The dopant material includes an organometallic compound represented by the following Chemical Formula 1: The host material comprises a mixture of a compound represented by the following Chemical Formula 2 and a compound represented by the following Chemical Formula 3: 【Chemistry 1】 In the above formula 1, X is oxygen (O); X １ , X ２ and X ３ are each independently CR′; R １ , R ２ , R ３ , R ４ , R ７ , R ８ and R' are each independently one selected from the group consisting of hydrogen, deuterium, halogen, alkyl group, cycloalkyl group, heteroalkyl group, arylalkyl group, alkoxy group, aryloxy group, amino group, silyl group, alkenyl group, cycloalkenyl group, heteroalkenyl group, alkynyl group, aryl group, heteroaryl group, acyl group, carbonyl group, carboxylic acid group, ester group, nitrile group, isonitrile group, sulfanyl group, sulfinyl group, sulfonyl group, phosphino group, and combinations thereof, wherein said R １ , R ２ , R ３ , R ４ , R ７ , R ８ and one or more of the hydrogen atoms of R′ can be substituted with deuterium; R １ , R ２ , R ３ , R ４ , R ７ , R ８ and R′ are each an alkyl group, a cycloalkyl group, a heteroalkyl group, an arylalkyl group, an alkoxy group, an aryloxy group, an amino group, a silyl group, an alkenyl group, a cycloalkenyl group, a heteroalkenyl group, an alkynyl group, an aryl group, a heteroaryl group, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a nitrile group, an isonitrile group, a sulfanyl group, a sulfinyl group, a sulfonyl group, or a phosphino group, １ , R ２ , R ３ , R ４ , R ７ , R ８ and one or more of the hydrogen atoms of R′ can be substituted with deuterium; R ５ and R ６ are each independently one selected from the group consisting of a halogen, an alkyl group, a cycloalkyl group, a heteroalkyl group, an arylalkyl group, an alkoxy group, an aryloxy group, an amino group, a silyl group, an alkenyl group, a cycloalkenyl group, a heteroalkenyl group, an alkynyl group, an aryl group, a heteroaryl group, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a nitrile group, an isonitrile group, a sulfanyl group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof, ５ and R ６ One or more of the hydrogen atoms in the formula (I) can be replaced with deuterium atoms. R ５ and R ６ is an alkyl group, a cycloalkyl group, a heteroalkyl group, an arylalkyl group, an alkoxy group, an aryloxy group, an amino group, a silyl group, an alkenyl group, a cycloalkenyl group, a heteroalkenyl group, an alkynyl group, an aryl group, a heteroaryl group, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a nitrile group, an isonitrile group, a sulfanyl group, a sulfinyl group, a sulfonyl group, or a phosphino group, ５ and R ６ One or more of the hydrogen atoms in the formula (I) can be replaced with deuterium atoms. n is a constant from 0 to 2, p, q, and w are independently constants from 1 to 4; 【Chemistry 2】 In the above formula 2, R ａ and R ｂ are each independently a C6-C40 aryl group, and each C6-C40 aryl group can be substituted with one or more substituents selected from the group consisting of an alkyl group, an aryl group, a heteroaryl group, a cyano group, an alkylsilyl group, and an arylsilyl group; R ｃ and R ｄ are each independently one selected from the group consisting of hydrogen, deuterium, halogen, cyano group, and alkyl group; r and s are each independently a constant from 0 to 7; when r is 2, 3, 4, 5, 6, or 7, each R ｃ are the same or different from each other, and when s is 2, 3, 4, 5, 6, or 7, each R ｄ are identical or different from each other, 【Transformation 3】 In the above formula 3, N-Het is triazinyl mono- or di-substituted with one or more substituents selected from the group consisting of phenyl, biphenyl, and naphthyl; L is one selected from the group consisting of a single bond; a substituted or unsubstituted C6-C60 arylene group; and a substituted or unsubstituted C2-C60 heteroarylene group; g is a constant of 1 to 3, and when g is 2 or 3, L's are the same or different from each other; R ９ ~R １８ are each independently one selected from the group consisting of hydrogen; deuterium; halogen; cyano group; substituted or unsubstituted C1-C60 alkyl group; substituted or unsubstituted C2-C60 alkenyl group; substituted or unsubstituted C2-C60 alkynyl group; substituted or unsubstituted C2-C60 alkoxy group; substituted or unsubstituted C3-C60 cycloalkyl group; substituted or unsubstituted C2-C60 heterocycloalkyl group; substituted or unsubstituted C6-C60 aryl group; substituted or unsubstituted C2-C60 heteroaryl group; substituted or unsubstituted phosphine oxide group; and substituted or unsubstituted amine group; R ９ ~R １８ two or more adjacent groups may be bonded to each other to form a substituted or unsubstituted C6-C60 aryl group or a substituted or unsubstituted C2-C60 heteroaryl group; h and i are each a constant from 0 to 3, and when h is 2 or 3, R １７ are the same or different from each other, and when i is 2 or 3, R １８ are identical or different from each other, The organometallic compound represented by Chemical Formula 1 includes one selected from the group consisting of Compounds GD-1 to GD-5 below: 【change】 The compound represented by Chemical Formula 2 includes one selected from the group consisting of Compounds GHH-1 to GHH-10 shown below: 【change】 【change】 The compound represented by the above formula 3 includes one selected from the group consisting of the following compounds GEH-1 to GEH-10. 【change】 【change】

2. In the above formula 1, n is 2. The organic light-emitting device according to claim 1 .

3. In the above formula 3, L is a single bond. The organic light-emitting device according to claim 1 .

4. The organic layer further includes one or more layers selected from the group consisting of a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer. The organic light-emitting device according to claim 1 .

5. first electrode; a second electrode facing the first electrode; and a first light emitting portion and a second light emitting portion located between the first electrode and the second electrode; the first light-emitting unit and the second light-emitting unit each include one or more light-emitting layers; at least one of the light-emitting layers includes a green phosphorescent light-emitting layer; the green phosphorescent light-emitting layer includes a dopant material and a host material, The dopant material includes an organometallic compound represented by the following Chemical Formula 1: The host material comprises a mixture containing a compound represented by the following Chemical Formula 2 and a compound represented by the following Chemical Formula 3: 【Chemistry 1】 In the above formula 1, X is oxygen (O); X １ , X ２ and X ３ are each independently CR′; R １ , R ２ , R ３ , R ４ , R ７ , R ８ and R' are each independently one selected from the group consisting of hydrogen, deuterium, halogen, alkyl group, cycloalkyl group, heteroalkyl group, arylalkyl group, alkoxy group, aryloxy group, amino group, silyl group, alkenyl group, cycloalkenyl group, heteroalkenyl group, alkynyl group, aryl group, heteroaryl group, acyl group, carbonyl group, carboxylic acid group, ester group, nitrile group, isonitrile group, sulfanyl group, sulfinyl group, sulfonyl group, phosphino group, and combinations thereof, wherein said R １ , R ２ , R ３ , R ４ , R ７ , R ８ and one or more of the hydrogen atoms of R′ can be substituted with deuterium; R １ , R ２ , R ３ , R ４ , R ７ , R ８ and R′ are each an alkyl group, a cycloalkyl group, a heteroalkyl group, an arylalkyl group, an alkoxy group, an aryloxy group, an amino group, a silyl group, an alkenyl group, a cycloalkenyl group, a heteroalkenyl group, an alkynyl group, an aryl group, a heteroaryl group, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a nitrile group, an isonitrile group, a sulfanyl group, a sulfinyl group, a sulfonyl group, or a phosphino group, １ , R ２ , R ３ , R ４ , R ７ , R ８ and one or more of the hydrogen atoms of R′ can be substituted with deuterium; R ５ and R ６ are each independently one selected from the group consisting of a halogen, an alkyl group, a cycloalkyl group, a heteroalkyl group, an arylalkyl group, an alkoxy group, an aryloxy group, an amino group, a silyl group, an alkenyl group, a cycloalkenyl group, a heteroalkenyl group, an alkynyl group, an aryl group, a heteroaryl group, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a nitrile group, an isonitrile group, a sulfanyl group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof, ５ and R ６ One or more of the hydrogen atoms in the formula (I) can be replaced with deuterium atoms. R ５ and R ６ is an alkyl group, a cycloalkyl group, a heteroalkyl group, an arylalkyl group, an alkoxy group, an aryloxy group, an amino group, a silyl group, an alkenyl group, a cycloalkenyl group, a heteroalkenyl group, an alkynyl group, an aryl group, a heteroaryl group, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a nitrile group, an isonitrile group, a sulfanyl group, a sulfinyl group, a sulfonyl group, or a phosphino group, ５ and R ６ One or more of the hydrogen atoms in the formula (I) can be replaced with deuterium atoms. n is a constant from 0 to 2, p, q, and w are independently constants from 1 to 4; 【Chemistry 2】 In the above formula 2, R ａ and R ｂ are each independently a C6-C40 aryl group, and each C6-C40 aryl group can be substituted with one or more substituents selected from the group consisting of an alkyl group, an aryl group, a heteroaryl group, a cyano group, an alkylsilyl group, and an arylsilyl group; R ｃ and R ｄ are each independently one selected from the group consisting of hydrogen, deuterium, halogen, cyano group, and alkyl group; r and s are each independently a constant from 0 to 7; when r is 2, 3, 4, 5, 6, or 7, each R ｃ are the same or different from each other, and when s is 2, 3, 4, 5, 6, or 7, each R ｄ are identical or different from each other, 【Transformation 3】 In the above formula 3, N-Het is triazinyl mono- or di-substituted with one or more substituents selected from the group consisting of phenyl, biphenyl, and naphthyl; L is one selected from the group consisting of a single bond; a substituted or unsubstituted C6-C60 arylene group; and a substituted or unsubstituted C2-C60 heteroarylene group; g is a constant of 1 to 3, and when g is 2 or 3, L's are the same or different from each other; R ９ ~R １８ are each independently one selected from the group consisting of hydrogen; deuterium; halogen; cyano group; substituted or unsubstituted C1-C60 alkyl group; substituted or unsubstituted C2-C60 alkenyl group; substituted or unsubstituted C2-C60 alkynyl group; substituted or unsubstituted C2-C60 alkoxy group; substituted or unsubstituted C3-C60 cycloalkyl group; substituted or unsubstituted C2-C60 heterocycloalkyl group; substituted or unsubstituted C6-C60 aryl group; substituted or unsubstituted C2-C60 heteroaryl group; substituted or unsubstituted phosphine oxide group; and substituted or unsubstituted amine group; R ９ ~R １８ two or more adjacent groups may be bonded to each other to form a substituted or unsubstituted C6-C60 aryl group or a substituted or unsubstituted C2-C60 heteroaryl group; h and i are each a constant from 0 to 3, and when h is 2 or 3, R １７ are the same or different from each other, and when i is 2 or 3, R １８ are identical or different from each other, The organometallic compound represented by Chemical Formula 1 includes one selected from the group consisting of Compounds GD-1 to GD-5 below: 【change】 The compound represented by Chemical Formula 2 includes one selected from the group consisting of Compounds GHH-1 to GHH-10 shown below: 【change】 【change】 The compound represented by the above formula 3 includes one selected from the group consisting of the following compounds GEH-1 to GEH-10. 【change】 【change】

6. first electrode; a second electrode facing the first electrode; and a first light emitting portion, a second light emitting portion, and a third light emitting portion located between the first electrode and the second electrode; each of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit includes one or more light-emitting layers; at least one of the light-emitting layers includes a green phosphorescent light-emitting layer; the green phosphorescent light-emitting layer includes a dopant material and a host material, The dopant material includes an organometallic compound represented by the following Chemical Formula 1: The host material comprises a mixture of a compound represented by the following Chemical Formula 2 and a compound represented by the following Chemical Formula 3: 【Chemistry 1】 In the above formula 1, X is oxygen (O); X １ , X ２ and X ３ are each independently CR′; R １ , R ２ , R ３ , R ４ , R ７ , R ８ and R' are each independently one selected from the group consisting of hydrogen, deuterium, halogen, alkyl group, cycloalkyl group, heteroalkyl group, arylalkyl group, alkoxy group, aryloxy group, amino group, silyl group, alkenyl group, cycloalkenyl group, heteroalkenyl group, alkynyl group, aryl group, heteroaryl group, acyl group, carbonyl group, carboxylic acid group, ester group, nitrile group, isonitrile group, sulfanyl group, sulfinyl group, sulfonyl group, phosphino group, and combinations thereof, wherein said R １ , R ２ , R ３ , R ４ , R ７ , R ８ and one or more of the hydrogen atoms of R′ can be substituted with deuterium; R １ , R ２ , R ３ , R ４ , R ７ , R ８ and R′ are each an alkyl group, a cycloalkyl group, a heteroalkyl group, an arylalkyl group, an alkoxy group, an aryloxy group, an amino group, a silyl group, an alkenyl group, a cycloalkenyl group, a heteroalkenyl group, an alkynyl group, an aryl group, a heteroaryl group, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a nitrile group, an isonitrile group, a sulfanyl group, a sulfinyl group, a sulfonyl group, or a phosphino group, １ , R ２ , R ３ , R ４ , R ７ , R ８ and one or more of the hydrogen atoms of R′ can be substituted with deuterium; R ５ and R ６ are each independently one selected from the group consisting of a halogen, an alkyl group, a cycloalkyl group, a heteroalkyl group, an arylalkyl group, an alkoxy group, an aryloxy group, an amino group, a silyl group, an alkenyl group, a cycloalkenyl group, a heteroalkenyl group, an alkynyl group, an aryl group, a heteroaryl group, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a nitrile group, an isonitrile group, a sulfanyl group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof, ５ and R ６ One or more of the hydrogen atoms in the formula (I) can be replaced with deuterium atoms. R ５ and R ６ is an alkyl group, a cycloalkyl group, a heteroalkyl group, an arylalkyl group, an alkoxy group, an aryloxy group, an amino group, a silyl group, an alkenyl group, a cycloalkenyl group, a heteroalkenyl group, an alkynyl group, an aryl group, a heteroaryl group, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a nitrile group, an isonitrile group, a sulfanyl group, a sulfinyl group, a sulfonyl group, or a phosphino group, ５ and R ６ One or more of the hydrogen atoms in the formula (I) can be replaced with deuterium atoms. n is a constant from 0 to 2, p, q, and w are independently constants from 1 to 4; 【Chemistry 2】 In the above formula 2, R ａ and R ｂ are each independently a C6-C40 aryl group, and each C6-C40 aryl group can be substituted with one or more substituents selected from the group consisting of an alkyl group, an aryl group, a heteroaryl group, a cyano group, an alkylsilyl group, and an arylsilyl group; R ｃ and R ｄ are each independently one selected from the group consisting of hydrogen, deuterium, halogen, cyano group, and alkyl group; r and s are each independently a constant from 0 to 7; when r is 2, 3, 4, 5, 6, or 7, each R ｃ are the same or different from each other, and when s is 2, 3, 4, 5, 6, or 7, each R ｄ are identical or different from each other, 【Transformation 3】 In the above formula 3, N-Het is triazinyl mono- or di-substituted with one or more substituents selected from the group consisting of phenyl, biphenyl, and naphthyl; L is one selected from the group consisting of a single bond; a substituted or unsubstituted C6-C60 arylene group; and a substituted or unsubstituted C2-C60 heteroarylene group; g is a constant of 1 to 3, and when g is 2 or 3, L's are the same or different from each other; R ９ ~R １８ are each independently one selected from the group consisting of hydrogen; deuterium; halogen; cyano group; substituted or unsubstituted C1-C60 alkyl group; substituted or unsubstituted C2-C60 alkenyl group; substituted or unsubstituted C2-C60 alkynyl group; substituted or unsubstituted C2-C60 alkoxy group; substituted or unsubstituted C3-C60 cycloalkyl group; substituted or unsubstituted C2-C60 heterocycloalkyl group; substituted or unsubstituted C6-C60 aryl group; substituted or unsubstituted C2-C60 heteroaryl group; substituted or unsubstituted phosphine oxide group; and substituted or unsubstituted amine group; R ９ ~R １８ two or more adjacent groups may be bonded to each other to form a substituted or unsubstituted C6-C60 aryl group or a substituted or unsubstituted C2-C60 heteroaryl group; h and i are each a constant from 0 to 3, and when h is 2 or 3, R １７ are the same or different from each other, and when i is 2 or 3, R １８ are identical or different from each other, The organometallic compound represented by Chemical Formula 1 includes one selected from the group consisting of Compounds GD-1 to GD-5 below: 【change】 The organometallic compound represented by Chemical Formula 2 includes one selected from the group consisting of Compounds GHH-1 to GHH-10 shown below: 【change】 【change】 The compound represented by the above formula 3 includes one selected from the group consisting of the following compounds GEH-1 to GEH-10. 【change】 【change】

7. substrate; an actuation element located on the substrate; and An organic light-emitting display device comprising: the organic light-emitting element according to any one of claims 1 to 6, located on the substrate and connected to the driving element.

Images