Organic light emitting diode comprising organometallic compound and multiple types of host materials

Abstract

The present disclosure relates to an organic light emitting diode comprising an organometallic compound and a plurality of types of host materials, and more particularly, to a light emitting layer and an organic light emitting diode comprising the same, the light emitting layer comprising a dopant material and a host material, the dopant material comprising an organometallic compound represented by Chemical Formula 1, and the host material includes a mixture of a compound represented by Chemical Formula 4 and a compound represented by Chemical Formula 5. Characteristics of the organic light emitting diode, such as high luminous efficiency and long lifetime, can be achieved. Lt; chemical formula 1gt; m (LA) m (LB) nlt; the chemical formula is 4gt; # imgabs0 # lt; the chemical formula is 5gt; # imgabs1 #

Description

Technical Field

[0001] The present disclosure relates to an organic light emitting diode including an organometallic compound and a plurality of types of host materials. Background Art

[0002] According to applications in various fields, the interest in display devices is increasing. As one of the display devices, the technology of an organic light emitting display device including an organic light emitting diode (OLED) is rapidly developing.

[0003] An OLED is an element for emitting the energy of an exciton as light after forming an electron and a hole in pairs to form an exciton when charge is injected into a light emitting layer formed between an anode and a cathode. Compared with conventional display technologies, an OLED can achieve a low voltage, consume relatively less power, have excellent colors, be applied to a flexible substrate to be used diversely, and allow the size of the display device to be freely adjusted.

[0004] Compared with a liquid crystal display (LCD) device, an OLED can have a wide viewing angle and a high contrast ratio, and does not require a backlight, making it lightweight and ultrathin. An OLED is formed by arranging a plurality of intermediate layers, such as a hole injection layer, a hole transport layer, a hole transport auxiliary layer, an electron blocking layer, a light emitting layer, an electron transport layer, and an electron injection layer, between a cathode (electron injection electrode) and an anode (hole injection electrode).

[0005] In the structure of an OLED, when a voltage is applied between two electrodes, electrons and holes are respectively injected from the cathode and the anode, and the exciton generated by the light emitting layer falls to the ground state to emit light.

[0006] The organic materials used in an OLED can be roughly classified into light emitting materials and charge transport materials. The light emitting materials are important factors determining the light emitting efficiency of an OLED. The light emitting materials should have a high quantum efficiency, excellent electron and hole mobilities, and be uniformly and stably present in the light emitting layer. According to colored light, the light emitting materials are classified into light emitting materials such as blue, red, and green, and are used as hosts and dopants to improve color purity and light emitting efficiency as colored materials through energy transfer.

[0007] In the case of a fluorescent material, although only about 25% of the singlet states among the excitons formed in the light emitting layer are used to generate light, and 75% of the triplet states are mostly lost as heat, a phosphorescent material has a light emitting mechanism that converts both singlet and triplet states into light.

[0008] To date, organometallic compounds have been used as phosphorescent materials used in OLEDs. There is still a technical need to improve the performance of OLEDs by obtaining highly efficient phosphorescent dopant materials and applying hosts with optimal photophysical properties to improve the efficiency and lifetime of the device compared to conventional OLEDs. Summary of the Invention

[0009] Accordingly, the present disclosure relates to providing an organic light-emitting diode in which an organometallic compound and various types of host materials capable of improving driving voltage, efficiency, and lifetime are applied to an organic light-emitting layer.

[0010] The objectives of the present disclosure are not limited to the above objectives, and other objectives and advantages not mentioned in the present disclosure can be understood from the following description and can be more clearly understood from the embodiments of the present disclosure. In addition, it can be easily seen that the objectives and advantages of the present disclosure can be achieved by the means described in the claims and their combinations.

[0011] To achieve the above objectives, an embodiment of the present disclosure can provide an organic light-emitting diode including: a first electrode; a second electrode facing the first electrode; and an intermediate layer disposed between the first electrode and the second electrode, wherein the intermediate layer includes a light-emitting layer, the light-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 mixture of a compound represented by Chemical Formula 4 below and a compound represented by Chemical Formula 5 below:

[0012] <Chemical Formula 1>

[0013] M(L A ) m (L B ) n

[0014] In Chemical Formula 1,

[0015] M is a central coordination metal and is one selected from the following: molybdenum (Mo); tungsten (W); rhenium (Re); ruthenium (Ru); osmium (Os); rhodium (Rh); iridium (Ir); palladium (Pd); platinum (Pt); and gold (Au),

[0016] L A is a ligand represented by Chemical Formula 2,

[0017] L B is a bidentate ligand,

[0018] m is 1, 2, or 3, n is 0, 1, or 2, and (m + n) is the oxidation number of the central coordination metal M,

[0019] <Chemical Formula 2>

[0020]

[0021] In Chemical Formula 2,

[0022] A has a ring structure selected from substituted or unsubstituted pyridine and substituted or unsubstituted pyrimidine, and optionally, A is partially or fully deuterated,

[0023] R 1 to R 8 are each independently one selected from the following: hydrogen; deuterium; substituted or unsubstituted C1-C20 linear alkyl; substituted or unsubstituted C3-C20 branched alkyl; and substituted or unsubstituted C4-C20 bicyclic alkyl, and optionally, R 1 to R 8 is partially or fully deuterated,

[0024] R 9 are each independently one selected from the following: hydrogen; deuterium; substituted or unsubstituted C1-C20 linear alkyl; substituted or unsubstituted C3-C20 branched alkyl; substituted or unsubstituted C3-C20 cycloalkyl; halogen; nitrile; substituted or unsubstituted C1-C20 alkoxy; and a group formed by connecting two or more of the above groups; and their combinations, and optionally, R 9 is partially or fully deuterated,

[0025] When any one of R 1 to R 9 is substituted, the substituents of R 1 to R 9 are each independently at least one selected from deuterium, halogen, C3-C10 cycloalkyl, and a group formed by connecting two or more of the above groups; and when there are plural substituents of R 1 to R 9 each substituent is the same as or different from each other,

[0026] Y is one selected from the following: BR 10 ; CR 10 R 11 ; C=O; CNR 10 ; SiR 10 R 11 ; NR 10 ; PR 10 ; AsR 10 ; SbR 10 ; P(O)R 10 ; P(S)R 10 ; P(Se)R 10 ; As(O)R 10 ; As(S)R10 ; As(Se)R 10 ; Sb(O)R 10 ; Sb(S)R 10 ; Sb(Se)R 10 ; O; S; Se; Te; SO; SO 2 ; SeO; SeO 2 ; TeO; and TeO 2 ,

[0027] X 1 to X 4 are each independently at least one selected from CR 12 and nitrogen (N),

[0028] When any two adjacent ones of X 1 to X 4 are CR 12 , the two Rs 12 do not bond, or bond to form a 5- or 6-membered substituted or unsubstituted aromatic or aromatic heterocyclic structure; when any two adjacent ones of X 1 to X 4 are one CR 12 and the other is nitrogen (N), R 12 does not bond to nitrogen, or bonds to nitrogen to form a 5- or 6-membered aromatic heterocyclic structure; and the aromatic or aromatic heterocyclic structure to which R 12 bonds is unsubstituted or substituted with at least one deuterium,

[0029] R 10 to R 12 are each independently at least one selected from the following: hydrogen; deuterium; halogen; hydroxyl; nitro; amidino; hydrazino; hydrazono; substituted or unsubstituted C1-C20 linear alkyl; substituted or unsubstituted C3-C20 branched alkyl; substituted or unsubstituted C3-C20 cycloalkyl; substituted or unsubstituted C1-C20 heteroalkyl; substituted or unsubstituted C7-C20 arylalkyl; substituted or unsubstituted C2-C20 alkenyl; substituted or unsubstituted C3-C20 cycloalkenyl; substituted or unsubstituted C2-C20 heteroalkenyl; substituted or unsubstituted C2-C20 alkynyl; substituted or unsubstituted C6-C30 aryl; substituted or unsubstituted C2-C30 heteroaryl; substituted or unsubstituted C1-C20 alkoxy; amino; silyl; C2-C30 acyl; carboxyl; nitrile; isonitrile; thiol; and phosphino,

[0030] When any one of R 10 to R 12 is substituted, R 10 to R 12The substituents are each independently at least one selected from deuterium and halogen; and when there are plural substituents of R 10 to R 12 , the substituents are the same as or different from each other,

[0031] p is 2, and

[0032] the dashed line represents the connection position to the central coordinating metal M,

[0033] <Chemical Formula 4>

[0034]

[0035] In Chemical Formula 4,

[0036] X is O or S,

[0037] Any one of the plural Rs 15 is represented by the following Chemical Formula 21, and the rest are each independently hydrogen or deuterium,

[0038] <Chemical Formula 21>

[0039]

[0040] In Chemical Formula 21,

[0041] Ar 1 and Ar 2 are each independently a substituted or unsubstituted C6-C60 aryl group; or a substituted or unsubstituted C2-C60 heteroaryl group; and

[0042] L 4 , L 5 and L 6 are each independently a single bond; a substituted or unsubstituted C6-C60 arylene group; or a substituted or unsubstituted C2-C60 heteroarylene group;

[0043] <Chemical Formula 5>

[0044]

[0045] In Chemical Formula 5,

[0046] Q is O or S,

[0047] W is each independently N or CH, provided that at least one of W is N,

[0048] L 1 is a single bond; or a substituted or unsubstituted C6-C60 arylene group; and

[0049] Ar 3 and Ar4 Each independently is a substituted or unsubstituted C6-C60 aryl, a substituted or unsubstituted C2-C60 heteroaryl, a substituted or unsubstituted C3-C60 cycloalkyl, or a substituted or unsubstituted C2-C60 heterocycloalkyl, and when Ar 3 and Ar 4 are heteroaryl or heterocycloalkyl, Ar 3 and Ar 4 contain at least one heteroatom selected from N, O, S, and combinations thereof.

[0050] According to an embodiment of the present disclosure, an organic light-emitting diode can be provided, which includes: a first electrode; a second electrode facing the first electrode; and one or more light-emitting parts positioned between the first electrode and the second electrode, wherein at least one of the light-emitting parts includes a red phosphorescent light-emitting layer, the red phosphorescent light-emitting layer contains a dopant material and a host material, the dopant material contains an organometallic compound represented by the following Chemical Formula 1, and the host material contains a compound represented by the following Chemical Formula 4 and a compound represented by the following Chemical Formula 5. The definitions of Chemical Formulas 1 to 3 are the same as those defined in an embodiment of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 is a cross-sectional view schematically showing an organic light-emitting diode (OLED) according to an embodiment of the present disclosure.

[0052] Figure 2 is a cross-sectional view schematically showing an OLED having a tandem structure with two light-emitting parts according to an embodiment of the present disclosure.

[0053] Figure 3 is a cross-sectional view schematically showing an OLED having a tandem structure with three light-emitting parts according to an embodiment of the present disclosure.

[0054] Figure 4 is a cross-sectional view schematically showing an OLED display device applying an OLED according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0055] Hereinafter, the above objects, features, and advantages will be described in detail with reference to the accompanying drawings, so that those skilled in the art to which the present disclosure pertains will be able to easily implement the technical spirit of the present disclosure. When determining that the detailed description of known technologies related to the present disclosure may unnecessarily obscure the gist of the present disclosure, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to denote the same or similar components.

[0056] In the specification, unless the term "only" is used, when terms such as "comprising", "having", "consisting of", "arranged", "disposed" are used, other parts may be added. Unless otherwise specifically stated, when a component is expressed in the singular, this includes cases where the component is provided as a plurality of components.

[0057] When interpreting components in the specification, even when there is no separate explicit description, the components are interpreted to include a margin of error.

[0058] In the specification, the arrangement of any component on the "upper (or lower) part" of a component or "above (or below)" a component not only means that any component is arranged in contact with the upper surface (or lower surface) of the component, but also means that another component may be interposed between the component and any component arranged above (or below) the component.

[0059] The terms "halo" or "halogen" used herein include fluorine, chlorine, bromine, and iodine.

[0060] The term "alkyl" used herein means both linear alkyls and branched alkyls. Unless otherwise specified, linear alkyls contain 1 to 60 carbon atoms, 1 to 30 carbon atoms, 1 to 20 carbon atoms, or 1 to 10 carbon atoms, and branched alkyls contain 3 to 60 carbon atoms, 3 to 30 carbon atoms, 3 to 20 carbon atoms, or 3 to 10 carbon atoms, and may include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, etc. In addition, the alkyl may be arbitrarily substituted.

[0061] The term "cycloalkyl" used herein means a cyclic alkyl. Unless otherwise specified, cycloalkyls contain 3 to 60 carbon atoms, 3 to 30 carbon atoms, 3 to 20 carbon atoms, or 3 to 10 carbon atoms, and may include cyclopropyl, cyclopentyl, cyclohexyl, etc. In addition, the cycloalkyl may be arbitrarily substituted.

[0062] The term "alkenyl" used herein means both linear alkenyls and branched alkenyls. Unless otherwise specified, alkenyls contain 2 to 60 carbon atoms, 2 to 30 carbon atoms, 2 to 20 carbon atoms, or 2 to 10 carbon atoms. In addition, the alkenyl may be arbitrarily substituted.

[0063] The term "cycloalkenyl" used herein means a cyclic alkenyl. Unless otherwise specified, cycloalkenyls contain 3 to 60 carbon atoms, 3 to 30 carbon atoms, 3 to 20 carbon atoms, or 3 to 10 carbon atoms. In addition, the cycloalkenyl may be arbitrarily substituted.

[0064] As used herein, the term "alkynyl" refers to both linear and branched alkynyl groups. Unless otherwise specified, alkynyl groups contain from 2 to 60 carbon atoms, from 2 to 30 carbon atoms, from 2 to 20 carbon atoms, or from 2 to 10 carbon atoms. Additionally, alkynyl groups may be optionally substituted.

[0065] As used herein, the term "cycloalkynyl" refers to cyclic alkynyl groups. Unless otherwise specified, cycloalkynyl groups contain from 3 to 60 carbon atoms, from 3 to 30 carbon atoms, from 3 to 20 carbon atoms, or from 3 to 10 carbon atoms. Additionally, cycloalkynyl groups may be optionally substituted.

[0066] As used herein, the terms "aralkyl" and "arylalkyl" are used interchangeably and refer to an alkyl group having an aromatic group as a substituent. Unless otherwise specified, aralkyl groups contain from 7 to 60 carbon atoms, from 7 to 30 carbon atoms, or from 7 to 20 carbon atoms. Additionally, aralkyl groups may be optionally substituted.

[0067] As used herein, the terms "aryl", "aromatic group", "aromatic ring", "carbocyclic aromatic group", and "heterocyclic aromatic group" include conjugated structures and may include monocyclic or polycyclic rings. Polycyclic rings may include "fused rings" of two or more rings where two adjacent rings share two carbons. Unless otherwise specified, aryl groups contain from 6 to 60 carbon atoms, from 6 to 30 carbon atoms, or from 6 to 20 carbon atoms. Monocyclic aryl groups include, but are not limited to, phenyl, biphenyl, terphenyl, etc. Polycyclic aryl groups include, but are not limited to, naphthyl, anthracenyl, phenanthrenyl, triphenylenyl, fluorenyl, etc. Additionally, aryl groups may be optionally substituted. The above description of aryl groups may be applied to arylene groups, with the difference that arylene groups are divalent groups.

[0068] Unless otherwise specified, the term "carbocyclic group" may be used as a term encompassing all "cycloalkyl", "cycloalkenyl", and "cycloalkynyl" (which are alicyclic ring groups) and "aryl (aromatic group)" (which is an aromatic ring group).

[0069] The term "heterocyclic group" may mean that at least one carbon atom constituting aryl, cycloalkyl, cycloalkenyl, cycloalkynyl, aralkyl (arylalkyl), arylamino, etc. is replaced by a heteroatom such as oxygen (O), nitrogen (N), sulfur (S), etc., and referring to the above definitions, includes heteroaryl, heterocycloalkyl, heterocycloalkenyl, heterocycloalkynyl, heteroaralkyl (heteroarylalkyl), heteroarylamino, etc. Unless otherwise specified, the heterocyclic group contains 2 to 60 carbon atoms, 2 to 30 carbon atoms, or 2 to 20 carbon atoms. Examples of heteroaryl include thienyl, furyl, pyridyl, pyrimidinyl, triazinyl, quinolinyl, quinazolinyl, quinoxalinyl, benzothienopyrimidinyl, benzofuropyrimidinyl, carbazolyl, N-phenylcarbazolyl, benzothienyl, dibenzothienyl, benzofuryl, dibenzofuryl, etc., but are not limited thereto. In addition, the heterocyclic group may be arbitrarily substituted. The above description of heteroaryl can be applied to heteroarylene, with the difference that heteroarylene is a divalent group.

[0070] As used herein, the terms "heteroalkyl", "heteroalkenyl", "heteroalkynyl" and "heteroaralkyl (heteroarylalkyl)" mean that at least one carbon atom constituting the corresponding "alkyl", "alkenyl", "alkynyl" and "aralkyl (arylalkyl)" is replaced by a heteroatom such as oxygen (O), nitrogen (N) and sulfur (S). In addition, heteroalkyl, heteroalkenyl, heteroalkynyl and heteroaralkyl (heteroarylalkyl) may be arbitrarily substituted.

[0071] As used herein, the terms "alkylamino", "aralkylamino", "arylamino" and "heteroarylamino" mean that the amino group is substituted by alkyl, aralkyl, aryl and heteroaryl as a heterocycle, and include all primary amines, secondary amines and tertiary amines. In addition, alkylamino, aralkylamino, arylamino and heteroarylamino may be arbitrarily substituted.

[0072] The terms "alkylsilyl", "arylsilyl", "alkoxy", "aryloxy", "alkylthio" and "arylthio" mean that silyl, oxy or thio is substituted by alkyl and aryl respectively. In addition, alkylsilyl, arylsilyl, alkoxy, aryloxy, alkylthio and arylthio may be arbitrarily substituted.

[0073] As used herein, the term "substituted" means that instead of a hydrogen atom (H) bonded to a carbon atom, another substituent is bonded to the corresponding carbon atom. The case of "substituted" may have a single substituent or plural substituents. When there are plural substituents, each substituent may be the same as or different from each other.

[0074] Unless otherwise specified herein, a substituent in the case of "substituted" may be at least one selected from the following: deuterium; halogen; C1-C20 alkyl; C3-C30 cycloalkyl; C1-C20 heteroalkyl; C2-C30 heterocycloalkyl; C7-C30 arylalkyl; C1-C20 alkoxy; C6-C30 aryloxy; amino; silyl; C1-C20 alkylsilyl; C6-C20 arylsilyl; C7-C20 alkylarylsilyl; C2-C20 alkenyl; C3-C20 cycloalkenyl; C2-C20 heteroalkenyl; C2-C20 alkynyl; C6-C30 aryl; C2-C30 heteroaryl; C2-C20 acyl; carboxyl; nitrile; isonitrile; thiol; phosphino; and a group formed by linking two or more of the above groups; and combinations thereof, and may include the case where at least one hydrogen of the substituent is replaced by deuterium. For example, the substituent is partially or fully deuterated.

[0075] The term "combinations thereof" in the definition of the substituent means that there may be multiple substituents, and a plurality of substituents are defined as a combination from the defined list.

[0076] Substituents other than those defined above as mentioned herein follow the known definitions of substituents.

[0077] As used herein, the case where any two of the substituents defined to contain hydrogen are bonded to form a ring includes the case where one of the two substituents is hydrogen and the other is not hydrogen and hydrogen is removed while the two substituents are bonded.

[0078] As used herein, "deuterated" may mean that deuterium is substituted for light hydrogen in a compound.

[0079] As used herein, the term "bidentate ligand" refers to a ligand having two coordination sites that can simultaneously bind to a metal atom such as iridium. In some embodiments, the bidentate ligand includes bidentate carboxylate / ester, bidentate amine, bidentate thiocarboxylate / ester, bidentate diphosphine, bidentate mercaptopyrimidine or bidentate dithiocarboxylate / ester.

[0080] Unless otherwise specified herein, there is no limitation on the position to be substituted as long as it is a position where a hydrogen atom is substituted (i.e., a position where a substituent can be substituted), and when there are two or more substituents, each substituent may be the same as or different from each other.

[0081] Unless otherwise specified, the objects and substituents defined herein may be the same as or different from each other.

[0082] Hereinafter, the structures of the organometallic compounds and the organic light-emitting diodes containing the same according to the present disclosure will be described in detail.

[0083] Generally, organometallic compounds are used as dopants in the phosphorescent light-emitting layer. For example, a structure such as 2-phenylpyridine is considered to be the main ligand structure of organometallic compounds. However, since conventional light-emitting dopants have limitations in improving the efficiency and lifespan of OLEDs, there is a need to develop new light-emitting dopant materials. The present disclosure was completed by experimentally verifying the following: By mixing a hole-transporting host and an electron-transporting host, which are host materials, with a dopant material, the efficiency and lifespan of OLEDs can be further improved and the driving voltage can be reduced, thereby improving the characteristics of OLEDs.

[0084] According to one embodiment of the present disclosure, there is provided an organic light-emitting diode, comprising:

[0085] a first electrode;

[0086] a second electrode facing the first electrode; and

[0087] an intermediate layer disposed between the first electrode and the second electrode,

[0088] wherein the intermediate layer includes a light-emitting layer, and the light-emitting layer contains a dopant material and a host material. The dopant material contains an organometallic compound represented by the following Chemical Formula 1, and

[0089] the host material contains a mixture of a compound represented by the following Chemical Formula 4 and a compound represented by Chemical Formula 5:

[0090] <Chemical Formula 1>

[0091] M(L A ) m (L B ) n

[0092] In Chemical Formula 1,

[0093] M is a central coordinating metal and is one selected from the following: molybdenum (Mo); tungsten (W); rhenium (Re); ruthenium (Ru); osmium (Os); rhodium (Rh); iridium (Ir); palladium (Pd); platinum (Pt); and gold (Au),

[0094] L A is a ligand represented by Chemical Formula 2,

[0095] L B is a bidentate ligand,

[0096] m is 1, 2, or 3, n is 0, 1, or 2, and (m + n) is the oxidation number of the central coordinating metal M,

[0097] <Chemical Formula 2>

[0098]

[0099] In Chemical Formula 2,

[0100] A has a ring structure selected from substituted or unsubstituted pyridine and substituted or unsubstituted pyrimidine, and optionally, A is partially or fully deuterated,

[0101] R 1 to R 8 are each independently one selected from the following: hydrogen; deuterium; substituted or unsubstituted C1-C20 linear alkyl; substituted or unsubstituted C3-C20 branched alkyl; and substituted or unsubstituted C4-C20 bicyclic alkyl, and optionally, R 1 to R 8 is partially or fully deuterated,

[0102] R 9 are each independently one selected from the following: hydrogen; deuterium; substituted or unsubstituted C1-C20 linear alkyl; substituted or unsubstituted C3-C20 branched alkyl; substituted or unsubstituted C3-C20 cycloalkyl; halogen; nitrile; substituted or unsubstituted C1-C20 alkoxy; and a group formed by connecting two or more of the above groups; and their combinations, and optionally, R 9 is partially or fully deuterated,

[0103] When any one of R 1 to R 9 is substituted, the substituents of R 1 to R 9 are each independently at least one selected from deuterium, halogen, C3-C10 cycloalkyl, and a group formed by connecting two or more of the above groups; and when there are plural substituents of R 1 to R 9 each substituent is the same as or different from each other,

[0104] Y is one selected from the following: BR 10 ; CR 10 R 11 ; C=O; CNR 10 ; SiR 10 R 11 ; NR 10 ; PR 10 ; AsR 10 ; SbR 10 ; P(O)R 10 ; P(S)R 10 ; P(Se)R 10 ; As(O)R 10 ; As(S)R 10; As(Se)R 10 ; Sb(O)R 10 ; Sb(S)R 10 ; Sb(Se)R 10 ; O; S; Se; Te; SO; SO 2 ; SeO; SeO 2 ; TeO; and TeO 2 ,

[0105] X 1 to X 4 are each independently at least one selected from CR 12 and nitrogen (N),

[0106] When any two adjacent ones among X 1 to X 4 are CR 12 two Rs 12 do not bond, or bond to form a 5- or 6-membered substituted or unsubstituted aromatic ring (such as a benzene ring) or aromatic heterocyclic ring (such as a pyridine ring) structure; when any two adjacent ones among X 1 to X 4 one of any two adjacent ones is CR 12 and the other is nitrogen (N), R 12 does not bond to nitrogen, or bonds to nitrogen to form a 5- or 6-membered aromatic heterocyclic ring structure (such as a pyridine ring); and the aromatic ring or aromatic heterocyclic ring structure to which R 12 bonds is unsubstituted or substituted with at least one deuterium,

[0107] R 10 to R 12 are each independently at least one selected from the following: hydrogen; deuterium; halogen; hydroxy; nitro; amidino; hydrazino; hydrazono; substituted or unsubstituted C1-C20 linear alkyl; substituted or unsubstituted C3-C20 branched alkyl; substituted or unsubstituted C3-C20 cycloalkyl; substituted or unsubstituted C1-C20 heteroalkyl; substituted or unsubstituted C7-C20 arylalkyl; substituted or unsubstituted C2-C20 alkenyl; substituted or unsubstituted C3-C20 cycloalkenyl; substituted or unsubstituted C2-C20 heteroalkenyl; substituted or unsubstituted C2-C20 alkynyl; substituted or unsubstituted C6-C30 aryl; substituted or unsubstituted C2-C30 heteroaryl; substituted or unsubstituted C1-C20 alkoxy; amino; silyl; C2-C30 acyl; carboxy; cyano; isocyano; mercapto; and phosphino,

[0108] When any one of R 10 to R 12 is substituted, R 10 to R12 The substituents are each independently at least one selected from deuterium and halogen; and when there are plural substituents of R 10 to R 12 the substituents are the same as or different from each other,

[0109] p is 2, and

[0110] the dashed line indicates the connection position to the central coordinating metal M.

[0111] <Chemical Formula 4>

[0112]

[0113] In Chemical Formula 4,

[0114] X is O or S, and

[0115] any one of the plural R 15 is represented by the following Chemical Formula 21, and the rest are each independently hydrogen or deuterium,

[0116] <Chemical Formula 21>

[0117]

[0118] In Chemical Formula 21,

[0119] Ar 1 and Ar 2 are each independently a substituted or unsubstituted C6-C60 aryl group; or a substituted or unsubstituted C2-C60 heteroaryl group; and

[0120] L 4 , L 5 and L 6 are each independently a single bond; a substituted or unsubstituted C6-C60 arylene group; or a substituted or unsubstituted C2-C60 heteroarylene group.

[0121] <Chemical Formula 5>

[0122]

[0123] In Chemical Formula 5,

[0124] Q is O or S,

[0125] W is each independently N or CH, provided that at least one of W is N,

[0126] L 1 is a single bond; or a substituted or unsubstituted C6-C60 arylene group; and

[0127] Ar 3and Ar 4 each independently is a substituted or unsubstituted C6-C60 aryl, a substituted or unsubstituted C2-C60 heteroaryl, a substituted or unsubstituted C3-C60 cycloalkyl, or a substituted or unsubstituted C2-C60 heterocycloalkyl, and when Ar 3 and Ar 4 are heteroaryl or heterocycloalkyl, Ar 3 and Ar 4 contain at least one heteroatom selected from N, O, S, and combinations thereof.

[0128] In one embodiment of the present disclosure, the compound represented by Chemical Formula 1, the compound represented by Chemical Formula 4, or the compound represented by Chemical Formula 5 may be partially or fully deuterated.

[0129] In one embodiment of the present disclosure, the organometallic compound represented by Chemical Formula 1 may have a homoleptic ligand or heteroleptic ligand structure. For example, it may have a homoleptic ligand structure where n is 0 in Chemical Formula 1, a heteroleptic ligand structure where n is 1, or a heteroleptic ligand structure where n is 2, and n may be, for example, 2.

[0130] In one embodiment of the present disclosure, n in Chemical Formula 1 may be one of the integers from 0 to 2, and n may be, for example, 2.

[0131] In one embodiment of the present disclosure, m in Chemical Formula 1 may be 1 or greater, for example, an integer from 1 to 3, and for example, an integer of 1 or 2.

[0132] In Chemical Formula 1, when m is 2 or 3 or n is 2, a plurality of substituents represented by the same symbol may be the same as or different from each other.

[0133] In some embodiments, L in Chemical Formula 1 B may contain an electron donor moiety to act as an electron donor auxiliary ligand. L as an electron donor auxiliary ligand B may serve to increase the electron density of the central coordinating metal M in Chemical Formula 1, thereby reducing the energy of MLCT (metal to ligand charge transfer) and increasing 3 the contribution rate of MLCT to the T 1 state. As a result, an organic light-emitting diode containing the organometallic compound represented by Chemical Formula 1 can achieve improved light-emitting characteristics, such as high luminous efficiency and high external quantum efficiency.

[0134] In one embodiment, L in Chemical Formula 1 B may be represented by at least one selected from the following Chemical Formula 3-1 and Chemical Formula 3-2:

[0135] <Chemical Formula 3-1>

[0136]

[0137] <Chemical Formula 3-2>

[0138]

[0139] In Chemical Formula 3-1 and Chemical Formula 3-2,

[0140] Z 3 to Z 5 each independently is one selected from the following: hydrogen; deuterium; halogen; hydroxyl; nitro; amidino; hydrazino; hydrazono; substituted or unsubstituted C1-C20 linear alkyl; substituted or unsubstituted C3-C20 branched alkyl; substituted or unsubstituted C3-C20 cycloalkyl; substituted or unsubstituted C1-C20 heteroalkyl; substituted or unsubstituted C7-C20 arylalkyl; substituted or unsubstituted C2-C20 alkenyl; substituted or unsubstituted C3-C20 cycloalkenyl; substituted or unsubstituted C2-C20 heteroalkenyl; substituted or unsubstituted C2-C20 alkynyl; substituted or unsubstituted C6-C30 aryl; substituted or unsubstituted C2-C30 heteroaryl; substituted or unsubstituted C1-C20 alkoxy; amino; silyl; acyl; carboxyl; nitrile; isonitrile; thiol; and phosphino,

[0141] Z 6 and Z 7 each independently is one selected from oxygen (O) and nitrogen (NR z ), and R z each independently is one selected from hydrogen, substituted or unsubstituted C1-C20 linear alkyl, and substituted or unsubstituted C3-C20 branched alkyl, and

[0142] The dashed line indicates the connection position to the central coordinating metal M.

[0143] In some embodiments, Z 3 and Z 5 can have the same structure. In some embodiments, at least one of Z 3 or Z 5 can be unsubstituted C4 branched alkyl, unsubstituted C5 branched alkyl, or unsubstituted C6 branched alkyl.

[0144] In some embodiments, Z 6 and Z 7 can have the same structure. In some embodiments, Z 6 or Z 7At least one of them can be NR z , and R z can be isobutyl. In some embodiments, Z 4 can be isobutyl.

[0145] In one embodiment, the compound represented by Chemical Formula 1 can be represented by one selected from Chemical Formula 1-1-(1), Chemical Formula 1-1-(2), Chemical Formula 1-1-(3), Chemical Formula 1-1-(4), Chemical Formula 1-1-(5), Chemical Formula 1-1-(6), Chemical Formula 1-2-(1), Chemical Formula 1-2-(2), Chemical Formula 1-2-(3), Chemical Formula 1-2-(4), Chemical Formula 1-2-(5), Chemical Formula 1-2-(6), Chemical Formula 1-3-(1), Chemical Formula 1-3-(2), Chemical Formula 1-3-(3), Chemical Formula 1-3-(4), Chemical Formula 1-3-(5), and Chemical Formula 1-3-(6),

[0146] <Chemical Formula 1-1-(1)>

[0147]

[0148] <Chemical Formula 1-1-(2)>

[0149]

[0150] <Chemical Formula 1-1-(3)>

[0151]

[0152] <Chemical Formula 1-1-(4)>

[0153]

[0154] <Chemical Formula 1-1-(5)>

[0155]

[0156] <Chemical Formula 1-1-(6)>

[0157]

[0158] <Chemical Formula 1-2-(1)>

[0159]

[0160] <Chemical Formula 1-2-(2)>

[0161]

[0162] <Chemical Formula 1-2-(3)>

[0163]

[0164] <Chemical Formula 1-2-(4)>

[0165]

[0166] <Chemical Formula 1-2-(5)>

[0167]

[0168] <Chemical Formula 1-2-(6)>

[0169]

[0170] <Chemical Formula 1-3-(1)>

[0171]

[0172] <Chemical Formula 1-3-(2)>

[0173]

[0174] <Chemical Formula 1-3-(3)>

[0175]

[0176] <Chemical Formula 1-3-(4)>

[0177]

[0178] <Chemical Formula 1-3-(5)>

[0179]

[0180] <Chemical Formula 1-3-(6)>

[0181]

[0182] In Chemical Formula 1-1-(1), Chemical Formula 1-1-(2), Chemical Formula 1-1-(3), Chemical Formula 1-1-(4), Chemical Formula 1-1-(5), Chemical Formula 1-1-(6), Chemical Formula 1-2-(1), Chemical Formula 1-2-(2), Chemical Formula 1-2-(3), Chemical Formula 1-2-(4), Chemical Formula 1-2-(5), Chemical Formula 1-2-(6), Chemical Formula 1-3-(1), Chemical Formula 1-3-(2), Chemical Formula 1-3-(3), Chemical Formula 1-3-(4), Chemical Formula 1-3-(5) and Chemical Formula 1-3-(6),

[0183] M, X 1 to X 4, Y, R 1 to R 9 , p, m and n are defined the same as in Chemical Formula 1, and

[0184] Z 3 to Z 7 are defined the same as in Chemical Formula 3-1 and Chemical Formula 3-2.

[0185] In one embodiment of the present disclosure, in Chemical Formula 2, A may have a pyridine ring structure.

[0186] In one embodiment of the present disclosure, M in Chemical Formula 1 may be iridium (Ir).

[0187] In one embodiment of the present disclosure, Y in Chemical Formula 2 may be any one of oxygen (O), sulfur (S), and selenium (Se).

[0188] In one embodiment of the present disclosure, R in Chemical Formula 2 9 at least one of them may not be hydrogen.

[0189] In one embodiment of the present disclosure, R in Chemical Formula 2 10 to R 12 may each independently be at least one selected from the following: hydrogen; deuterium; halogen; nitrile; nitro; substituted or unsubstituted C1-C20 alkoxy; amino; substituted or unsubstituted C1-C10 linear alkyl; substituted or unsubstituted C3-C10 branched alkyl; and substituted or unsubstituted C3-C10 cycloalkyl.

[0190] According to one embodiment of the present disclosure, the organometallic compound represented by Chemical Formula 1 may be one of the following compounds RD-1 to RD-20, but not limited thereto, as long as it is included in the chemical

[0191] limitation of Formula 1.

[0192]

[0193]

[0194]

[0195]

[0196] In one embodiment of the present disclosure, the compound represented by Chemical Formula 4 may be represented by any one of the following Chemical Formulas 4-1 to 4-10:

[0197]

[0198]

[0199] In Chemical Formulas 4-1 to 4-10,

[0200] X, R 15 , Ar 1 , Ar 2 , L 4 , L 5 and L 6 are the same as those defined in Chemical Formula 4.

[0201] In one embodiment, Ar 1 and Ar 2 are each independently phenyl, biphenyl, terphenyl, naphthyl, phenanthryl, (naphthyl)phenyl, (phenyl)naphthyl, fluorenyl, dimethylfluorenyl, dibenzofuranyl, dibenzothiophenyl, carbazolyl, 9-phenylcarbazolyl, benzonaphthofuranyl, or benzonaphthothiophenyl.

[0202] In one embodiment, L 4 can be a single bond, phenylene, biphenyldiyl, naphthalenediyl, or binaphthyldiyl.

[0203] In one embodiment of the present disclosure, the compound represented by Chemical Formula 4 can be one selected from the following compounds RHH-1 to RHH-20, and is not limited thereto as long as it falls within the definition of Chemical

[0204] Formula 4.

[0205]

[0206]

[0207] In one embodiment, at least one of Ar 3 and Ar 4 in Chemical Formula 5 can be a deuterium-substituted aryl, a deuterium-substituted heteroaryl, a deuterium-substituted cycloalkyl, or a deuterium-substituted heterocycloalkyl.

[0208] In one embodiment, Ar 3 and Ar 4 can both be aryls.

[0209] In one embodiment, one of Ar 3 and Ar 4 in Chemical Formula 5 can be an aryl, and the other can be a heteroaryl.

[0210] In one embodiment, one of Ar 3 and Ar 4 can be a deuterium-substituted aryl, and the other can be an aryl or a heteroaryl.

[0211] In one embodiment, Ar 3 and Ar 4 are each independently phenyl, biphenyl, terphenyl, naphthyl, phenanthryl, (phenyl)naphthyl, (naphthyl)phenyl, dimethylfluorenyl, diphenylfluorenyl, dibenzofuranyl, dibenzothiophenyl, carbazol-9-yl, or 9-phenyl-9H-carbazolyl, and Ar 3 and Ar 4 are each independently unsubstituted or substituted with one or more deuteriums.

[0212] In one embodiment, Ar 4 are each independently phenyl, biphenyl, terphenyl, naphthyl, phenanthryl, (phenyl)naphthyl, (naphthyl)phenyl, dimethylfluorenyl, diphenylfluorenyl, dibenzofuranyl, dibenzothiophenyl, carbazol-9-yl, or 9-phenyl-9H-carbazolyl, and Ar 3 and Ar 4 are each unsubstituted or substituted with one or more deuteriums.

[0213] In one embodiment of the present disclosure, the compound represented by Chemical Formula 5 may be one selected from the following compounds REH-1 to REH-20, and is not limited thereto as long as it falls within the definition of Chemical Formula 5.

[0214]

[0215]

[0216] Specifically, with reference to Figure 1 according to one embodiment of the present disclosure, an OLED 100 can be provided, which includes a first electrode 110, a second electrode 120 facing the first electrode 110, and an intermediate layer 130 disposed between the first electrode 110 and the second electrode 120. The intermediate layer 130 may include a light-emitting layer 160, the light-emitting layer 160 may contain a dopant material 160' and host materials 160'' and 160''', and contain an organometallic compound represented by Chemical Formula 1 as the dopant material 160', and the host materials may include the following two types: a compound represented by Chemical Formula 4 as a hole-transporting host 160'' and a compound represented by Chemical Formula 5 as an electron-transporting host 160'''.

[0217] In addition, in the OLED 100, the intermediate layer 130 disposed between the first electrode 110 and the second electrode 120 may have a structure sequentially including a hole injection layer (HIL) 140, a hole transport layer (HTL) 150, a light-emitting layer (EML) 160, an electron transport layer (ETL) 170, and an electron injection layer (EIL) 180 starting from the first electrode 110. The second electrode 120 may be formed on the electron injection layer 180, and a protective film (not shown) may be formed on the second electrode 120.

[0218] In addition, although Figure 1 not shown in [reference], one or more of a hole transport assisting layer and an electron blocking layer may be further added between the hole transport layer 150 and the light-emitting layer 160.

[0219] The hole transport assisting layer may contain a compound having good hole transport characteristics and regulate the hole injection characteristics by reducing the HOMO energy level difference between the hole transport layer 150 and the light-emitting layer 160, thereby reducing the hole accumulation at the interface between the hole transport assisting layer and the light-emitting layer 160. Therefore, the quenching phenomenon of excitons being polarized and annihilated at the interface can be reduced. Therefore, the deterioration phenomenon of the device can be reduced, thereby stabilizing the device and improving its efficiency and lifespan.

[0220] The electron blocking layer can prevent electrons from being introduced into the hole transport layer by regulating the movement of electrons and the recombination with holes, thereby improving the efficiency and lifespan of the OLED. The material for forming the electron blocking layer may be selected from TCTA, tris[4-(diethylamino)phenyl]amine, N-(biphenyl-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluorene-2-amine, TAPC, MTDATA, mCP, mCBP, CuPC, DNTPD, TDAPB, DCDPA, 2,8-bis(9-phenyl-9H-carbazol-3-yl)dibenzothiophene, etc. In addition, the electron blocking layer may contain an inorganic compound. The inorganic compound may be selected from halide compounds such as LiF, NaF, KF, RbF, CsF, FrF, MgF 2 , CaF 2 , SrF 2 , BaF 2 , LiCl, NaCl, KCl, RbCl, CsCl, and FrCl; and oxides such as Li 2 O, Li 2 O 2 , Na 2 O, K 2 , Rb 2 , Rb 2 O 2 , Cs 2O, Cs 2 O 2 , LiAlO 2 , LiBO 2 , LiTaO 3 , LiNbO 3 , LiWO 4 , Li 2 CO, NaWO 4 , KAlO 2 , K 2 SiO 3 , B 2 O 5 , Al 2 O 3 and SiO 2 , but not limited thereto.

[0221] The first electrode 110 can be an anode and can be made of ITO, IZO, tin oxide, or zinc oxide, which are conductive materials having a relatively high work function value, but not limited thereto.

[0222] The second electrode 120 can be a cathode and can include Al, Mg, Ca, Ag, or an alloy or combination thereof, which are conductive materials having a relatively low work function value, but not limited thereto.

[0223] The hole injection layer 140 can be positioned between the first electrode 110 and the hole transport layer 150. The hole injection layer 140 can have the function of improving the interfacial characteristics between the first electrode 110 and the hole transport layer 150 and can be selected as a material having appropriate conductivity. The hole injection layer 140 can include compounds 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 N1,N1'-([1,1'-biphenyl]-4,4'-diyl)bis(N1,N4,N4-triphenylbenzene-1,4-diamine), but not limited thereto.

[0224] The hole transport layer 150 can be positioned adjacent to the light-emitting layer between the first electrode 110 and the light-emitting layer 160. The hole transport layer 150 can include compounds such as: TPD, NPB, CBP, N-(biphenyl-4-yl)-9,9-dimethyl-N-((4-9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluorene-2-amine, or N-(biphenyl-4-yl)-N-(((4-9-phenyl-9H-carbazol-3-yl)phenyl)biphenyl)-4-amine, preferably NPB, but not limited thereto.

[0225] According to an embodiment of the present disclosure, the light-emitting layer 160 can be formed by doping an organometallic compound represented by Chemical Formula 1 as a dopant 160' to improve the light-emitting efficiency of the hosts 160" and 160"', and the device, etc. The dopant 160' can be used as a material for emitting green light or red light. For example, it can be used as a red phosphorescent material.

[0226] According to an embodiment of the present disclosure, based on the total weight of the two types of hosts 160" and 160"', the doping concentration of the dopant 160' can be adjusted within the range of 1 wt% to 30 wt%, and is not limited thereto. For example, the doping concentration can be 2 wt% to 20 wt%, for example 3 wt% to 15 wt%, for example 5 wt% to 10 wt%, for example 3 wt% to 8 wt%, for example 2 wt% to 7 wt%, for example 5 wt% to 7 wt%, for example 5 wt% to 6 wt%.

[0227] According to an embodiment of the present disclosure, the mixing ratio of the two types of hosts 160" and 160"' is not particularly limited. The host 160" represented by Chemical Formula 4 can have hole-transporting properties, and the host 160"' represented by Chemical Formula 5 can have electron-transporting properties. Therefore, when the two types of hosts are mixed, the lifetime characteristics can be increased, and the mixing ratio of the two types of hosts can be appropriately adjusted. Thus, the mixing ratio of the two hosts in which the compound represented by Chemical Formula 4 and the compound represented by Chemical Formula 5 are mixed is not particularly limited, and the ratio (by weight) of the compound represented by Chemical Formula 4 to the compound represented by Chemical Formula 5 can be, for example, in the range of 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, for example 8:2.

[0228] In addition, the electron-transporting layer 170 and the electron-injecting layer 180 can be sequentially stacked between the light-emitting layer 160 and the second electrode 120. The material of the electron-transporting layer requires high electron mobility, and electrons can be stably supplied to the light-emitting layer through smooth electron transport.

[0229] For example, the material of the electron-transporting layer 170 is used in the art and can include, for example, compounds such as: Alq 3 (aluminum tris(8-hydroxyquinoline)), Liq (lithium 8-hydroxyquinoline), PBD (2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4- diazole), TAZ (3-(4-biphenyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole), spiro-PBD, BAlq (bis(2-methyl-8-hydroxyquinolinato)-4-(phenylphenolato)aluminum), SAlq, TPBi (2,2’,2-(1,3,5-benzenetriyl)-tris(1-phenyl-1H-benzoimidazole), diazole, triazole, phenanthroline, benzo azole, benzothiazole, or 2-(4-(9,10-di(naphthalen-2-yl)anthracen-2-yl)phenyl)-1-phenyl-1H-benzo[d]imidazole, preferably 2-(4-(9,10-di(naphthalen-2-yl)anthracen-2-yl)phenyl)-1-phenyl-1H-benzo[d]imidazole, but not limited thereto.

[0230] The electron injection layer 180 is used to enable smooth injection of electrons, and the material of the electron injection layer is used in the art and may include, for example, Alq 3 (aluminum tris(8-hydroxyquinoline)), PBD, TAZ, spiro-PBD, BAlq, SAlq, etc., but not limited thereto. Alternatively, the electron injection layer 180 may be made of a metal compound, and the metal compound may include, for example, Liq, LiF, NaF, KF, RbF, CsF, FrF, BeF 2 , MgF 2 , CaF 2 , SrF 2 , BaF 2 , RaF 2 etc., but not limited thereto.

[0231] The OLED according to the present disclosure may be a white OLED having a tandem structure. In a tandem OLED according to an embodiment of the present disclosure, a single light-emitting stack (or light-emitting part) may be formed in a structure in which two or more light-emitting stacks (or light-emitting parts) are connected by a charge generation layer CGL. The organic light-emitting diode may include a first electrode and a second electrode facing each other on a substrate, and two or more light-emitting stacks (light-emitting parts) stacked between the first electrode and the second electrode and including a light-emitting layer to emit light of a specific wavelength band. A plurality of light-emitting stacks (light-emitting parts) may be used to emit the same color or different colors. In addition, one light-emitting stack (light-emitting part) may include one or more light-emitting layers, and a plurality of light-emitting layers may be light-emitting layers of the same color or different colors.

[0232] In this case, one or more of the light-emitting layers included in the plurality of light-emitting parts may contain the organometallic compound represented by Chemical Formula 1 according to the present disclosure as a dopant material. A plurality of light-emitting parts having a tandem structure may be connected to a charge generation layer CGL formed of an N-type charge generation layer and a P-type charge generation layer.

[0233] According to an embodiment of the present disclosure, there is provided an organic light emitting diode, which includes:

[0234] a first electrode;

[0235] a second electrode facing the first electrode; and

[0236] one or more light emitting units positioned between the first electrode and the second electrode,

[0237] wherein at least one of the light emitting units includes a red phosphorescent light emitting layer,

[0238] the red phosphorescent light emitting layer includes a dopant material and a host material,

[0239] the dopant material includes an organometallic compound represented by Chemical Formula 1, and

[0240] the host material includes a mixture of a compound represented by Chemical Formula 4 and a compound represented by Chemical Formula 5.

[0241] The detailed descriptions of the first electrode, the second electrode, the organometallic compound represented by Chemical Formula 1, the compound represented by Chemical Formula 4, and the compound represented by Chemical Formula 5 are as described above.

[0242] The organic light emitting diode may have a plurality of light emitting units present between the first electrode and the second electrode, and form a structure connected by a charge generation layer disposed between the plurality of light emitting units.

[0243] For the exemplary embodiment of the present disclosure Figure 2 and Figure 3 are cross-sectional views schematically showing OLEDs in a series structure respectively having two light emitting units and three light emitting units.

[0244] As Figure 2 shown, the OLED 100 of the present disclosure includes a first electrode 110 and a second electrode 120 facing each other, and an intermediate layer 230 positioned between the first electrode 110 and the second electrode 120. The intermediate layer 230 includes a first light emitting unit ST1 positioned between the first electrode 110 and the second electrode 120 and including a first light emitting layer 261, a second light emitting unit ST2 positioned between the first light emitting unit ST1 and the second electrode 120 and including a second light emitting layer 262, and a charge generation layer CGL positioned between the first light emitting unit ST1 and the second light emitting unit ST2. The charge generation layer CGL may include an N-type charge generation layer 291 and a P-type charge generation layer 292. One or more 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 disclosure as a dopant 262'. For example, as Figure 2As shown, the second light-emitting layer 262 of the second light-emitting unit ST2 may include a compound represented by Chemical Formula 1 as a dopant 262', a compound represented by Chemical Formula 4 as a hole-transporting host 262", and a compound represented by Chemical Formula 5 as an electron-transporting host 262'". Although Figure 2 is not shown, each of the first light-emitting unit ST1 and the second light-emitting unit ST2 may further include additional light-emitting layers other than the first light-emitting layer 261 and the second light-emitting layer 262. The above description of Figure 1 the hole-transporting layer 150 may be applied in the same or similar manner to Figure 2 the first hole-transporting layer 251 and the second hole-transporting layer 252. In addition, the above description of Figure 1 the electron-transporting layer 170 may be applied in the same or similar manner to Figure 2 the first electron-transporting layer 271 and the second electron-transporting layer 272.

[0245] As Figure 3 shown, the OLED 100 of the present disclosure includes a first electrode 110 and a second electrode 120 facing each other, and an intermediate layer 330 positioned between the first electrode 110 and the second electrode 120. The intermediate layer 330 includes a first light-emitting unit ST1 positioned between the first electrode 110 and the second electrode 120 and including a first light-emitting layer 261, a second light-emitting unit ST2 including a second light-emitting layer 262, a third light-emitting unit ST3 including a third light-emitting layer 263, a first charge generation layer CGL1 positioned between the first light-emitting unit ST1 and the second light-emitting unit ST2, and a second charge generation layer CGL2 positioned between the second light-emitting unit ST2 and the third light-emitting unit ST3. The first charge generation layer CGL1 and the second charge generation layer CGL2 may include an N-type charge generation layer 291 and 293, and a P-type charge generation layer 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 include an organometallic compound represented by Chemical Formula 1 according to the present disclosure as a dopant. For example, as Figure 3 shown, the second light-emitting layer 262 of the second light-emitting unit ST2 may include a compound represented by Chemical Formula 1 as a dopant 262', a compound represented by Chemical Formula 4 as a hole-transporting host 262", and a compound represented by Chemical Formula 5 as an electron-transporting host 262'". Although Figure 3 is not shown, in addition to the first light-emitting layer 261, the second light-emitting layer 262, and the third light-emitting layer 263, each of the first light-emitting unit ST1, the second light-emitting unit ST2, and the third light-emitting unit ST3 may be formed as a plurality of light-emitting layers by including additional light-emitting layers. The above description of Figure 1 the hole-transporting layer 150 may be applied in the same or similar manner toFigure 3 The first hole transport layer 251, the second hole transport layer 252, and the third hole transport layer 253. In addition, the content described above regarding Figure 1 the electron transport layer 170 can be applied to Figure 3 the first electron transport layer 271, the second electron transport layer 272, and the third electron transport layer 273 in the same or similar manner.

[0246] In addition, an OLED according to an embodiment of the present disclosure may include a tandem structure in which four or more light-emitting units and three or more charge generation layers are disposed between a first electrode and a second electrode.

[0247] The OLED according to the present disclosure can be used in an OLED display device and a lighting device using an OLED.

[0248] According to an embodiment of the present disclosure, there is provided an organic light-emitting diode display device, including:

[0249] A substrate;

[0250] A driving element positioned on the substrate; and

[0251] An organic light-emitting diode positioned on the substrate and connected to the driving element.

[0252] In one embodiment, Figure 4 is a cross-sectional view schematically showing an OLED display device to which an OLED according to an exemplary embodiment of the present disclosure is applied.

[0253] As Figure 4 shown, the OLED display device 3000 may include a substrate 3010, an OLED 4000, and a encapsulation film 3900 covering the OLED 4000. On the substrate 3010, a driving thin film transistor Td for a driving element and an OLED 4000 connected to the driving thin film transistor Td are positioned.

[0254] Although Figure 4 not clearly shown in, on the substrate 3010, gate lines and data lines that cross each other to define a pixel region, a power line spaced apart from any one of the gate lines and the data lines and extending in parallel, a switching thin film transistor connected to the gate lines and the data lines, and a storage capacitor connected to one electrode of the switching thin film transistor and the power line are also formed.

[0255] 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.

[0256] The semiconductor layer 3100 may be formed on the substrate 3010 and may be made of an oxide semiconductor material or polysilicon. When the semiconductor layer 3100 is made of an oxide semiconductor material, a light-blocking pattern (not shown) may be formed under the semiconductor layer 3100, and the light-blocking pattern prevents light from incident on the semiconductor layer 3100, thereby preventing deterioration of the semiconductor layer 3100 caused by light. Alternatively, the semiconductor layer 3100 may be made of polysilicon, and in this case, two edges of the semiconductor layer 3100 may be doped with impurities.

[0257] A gate insulating film 3200 made of an insulating material is formed on the entire surfaces of the substrate 3010 and the semiconductor layer 3100. The gate insulating film 3200 may be made of an inorganic insulating material such as silicon oxide or silicon nitride.

[0258] A gate electrode 3300 made of a conductive material (such as a metal) is formed above the gate insulating film 3200 corresponding to the center of the semiconductor layer 3100. The gate electrode 3300 is connected to the switching thin film transistor.

[0259] An interlayer insulating film 3400 made of an insulating material is formed on the entire surfaces of the substrate 3010 and 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 photoacrylic).

[0260] The interlayer insulating film 3400 has a first semiconductor layer contact hole 3420 and a second semiconductor layer contact hole 3440 that expose both sides of the semiconductor layer 3100. The first semiconductor layer contact hole 3420 and the second semiconductor layer contact hole 3440 are positioned to be spaced apart from the gate electrode 3300 on both sides of the gate electrode 3300.

[0261] A source electrode 3520 and a drain electrode 3540 made of a conductive material (such as a metal) are formed on the interlayer insulating film 3400. The source electrode 3520 and the drain electrode 3540 are positioned to be spaced apart from each other with respect to the gate electrode 3300, and contact both sides of the semiconductor layer 3100 through the first semiconductor layer contact hole 3420 and the second semiconductor layer contact hole 3440, respectively. The source electrode 3520 is connected to a power line (not shown).

[0262] The semiconductor layer 3100, the gate electrode 3300, the source electrode 3520, and the drain electrode 3540 form 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 positioned above the semiconductor layer 3100.

[0263] Alternatively, the driving thin film transistor Td may have an inverted staggered structure in which the gate electrode is positioned below the semiconductor layer and the source and drain electrodes are positioned 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.

[0264] Meanwhile, the OLED display device 3000 may include a color filter 3600 that absorbs light generated by the OLED 4000. For example, the color filter 3600 may absorb light of red (R), green (G), blue (B), and white (W). In this case, the red color filter pattern, green color filter pattern, and blue color filter pattern that absorb light may be separately formed in each pixel region, and each color filter pattern may be arranged to overlap with each intermediate layer 4300 of the OLED 4000 that emits light within the wavelength band to be absorbed. By employing the color filter 3600, the OLED display device 3000 can achieve full color.

[0265] For example, when the OLED display device 3000 is a bottom emission type, the color filter 3600 that absorbs light may be positioned above the interlayer insulating film 3400 corresponding to the OLED 4000. In an exemplary embodiment, when the OLED display device 3000 is a top emission type, the color filter may be positioned above the OLED 4000, i.e., above the second electrode 4200. For example, the color filter 3600 may be formed to have a thickness of 2 μm to 5 μm.

[0266] Meanwhile, a planarization layer 3700 having a drain contact hole 3720 that exposes the drain electrode 3540 of the driving thin film transistor Td is formed to cover the driving thin film transistor Td.

[0267] 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 separately formed in each pixel region.

[0268] The first electrode 4100 may be an anode and may be made of a conductive material having a relatively high work function value. For example, the first electrode 4100 may be made of a transparent conductive material such as ITO, IZO, or ZnO.

[0269] Meanwhile, when the OLED display device 3000 is a top emission type, a reflective electrode or reflective layer may also be formed below the first electrode 4100. For example, the reflective electrode or reflective layer may be made of any one of aluminum (Al), silver (Ag), nickel (Ni), or an aluminum-palladium-copper (APC) alloy.

[0270] On the planarization layer 3700, a bank layer 3800 is formed to cover the edge of the first electrode 4100. The bank layer 3800 exposes the first electrode 4100 corresponding to the center of the pixel region.

[0271] An intermediate layer 4300 is formed on the first electrode 4100. If necessary, the OLED 4000 may have a tandem structure. For the tandem structure, refer to the Figures 2 to 3 description above and the following.

[0272] Above the substrate 3010 on which the intermediate layer 4300 is formed, a second electrode 4200 is formed. The second electrode 4200 may be positioned on the entire surface of the display area and may be made of a conductive material having a relatively low work function value to serve as a cathode. For example, the second electrode 4200 may be made of any one of aluminum (Al), magnesium (Mg), and an aluminum - magnesium alloy (Al - Mg).

[0273] The first electrode 4100, the intermediate layer 4300, and the second electrode 4200 form the OLED 4000.

[0274] On the second electrode 4200, a encapsulation film 3900 is formed to prevent external moisture from infiltrating into the OLED 4000. Although Figure 4 not clearly shown in the figure, the encapsulation film 3900 may have a three - layer structure in which a first inorganic layer, an intermediate layer, and a second inorganic layer are sequentially stacked, but is not limited thereto.

[0275] Hereinafter, embodiments of the present disclosure will be described. However, the following embodiments are only examples of the present disclosure, and the present disclosure is not limited thereto.

[0276] (Embodiment)

[0277] Example 1

[0278] Before use, the ITO substrate is cleaned with UV ozone and then loaded into the evaporation system. Then, the substrate is transferred to a vacuum deposition chamber for depositing all other layers above the substrate. Under a vacuum of about 10 -7 torr, the following layers are deposited in the following order by evaporation from a heated boat.

[0279] HATCN (see the following structure), which is a hole injection material, is thermally deposited in vacuum on the provided ITO transparent electrode to form a hole injection layer with a thickness of and then HTL (see the following structure), which is a hole transport material, is thermally deposited in vacuum to form a thickness of hole transport layer. Subsequently, a mixture of RD1 as a dopant and RHH1 and REH1 as hosts (RHH1:REH1 = 1:1, by weight) was used to form a light-emitting layer with a thickness of 3 (see the following structure) and LiF as an electron injection material to form a thickness of electron transport layer and a thickness of electron injection layer, and then deposit aluminum with a thickness of to form a cathode, to fabricate an OLED having a structure of ITO / hole injection layer / hole transport layer / light-emitting layer / electron transport layer / electron injection layer / cathode. After depositing the layers, the layers were transferred from the deposition chamber to a drying oven to form films, and then encapsulated using a UV-cured epoxy resin and a moisture absorbent.

[0280] Examples 2 to 144 and Comparative Examples 1 to 4

[0281] OLEDs of Comparative Examples 1 to 4 and Examples 2 to 144 were fabricated in the same manner as in Example 1, except that the dopant materials and host materials shown in Tables 1 to 8 below were used in Example 1. In Examples 2 to 144, the mixing ratio of the host materials was 1:1 (by weight). Each of Comparative Examples 1 to 4 used a "CBP" type having the following structure as the host of the light-emitting layer.

[0282] The materials used in Examples 1 to 144 and Comparative Examples 1 to 4 are as follows:

[0283]

[0284]

[0285]

[0286] Experimental Example

[0287] The light-emitting area of the OLEDs fabricated in Examples 1 to 144 and Comparative Examples 1 to 4 was 9 mm 2 . Each OLED was connected to an external power supply, and the device characteristics were evaluated at room temperature using a current source (KEITHLEY) and a photometer (PR 650), and the results are shown in Tables 1 to 8 below. When a DC voltage was applied, light emission with the characteristics shown in Tables 1 to 8 below was confirmed.

[0288] Specifically, at 10 mA / cm 2The current measurement drive voltage (V), external quantum efficiency (EQE), and lifetime (LT95) characteristics, and the measured values of Examples 1 to 144 were calculated as relative values (percentage, %) with respect to one of Comparative Examples 1 to 4, and the results are shown in Tables 1 to 8 below.

[0289] The LT95 lifetime represents the time it takes for the OLED to lose 5% of its initial brightness (the lifetime decreases from 100% to 95%) at 40 °C and 40 mA / cm 2 . LT95 is the most difficult component characteristic specification to meet, and LT95 is used to determine whether an image burn-in phenomenon occurs in the OLED.

[0290] [Table 1]

[0291]

[0292] [Table 2]

[0293]

[0294] [Table 3]

[0295]

[0296] [Table 4]

[0297]

[0298] [Table 5]

[0299]

[0300] [Table 6]

[0301]

[0302] [Table 7]

[0303]

[0304] [Table 8]

[0305]

[0306] As can be seen from the results in Tables 1 to 8, Examples 1 to 144 provide OLEDs that use an organometallic compound satisfying the structure represented by Chemical Formula 1 as a dopant in the light-emitting layer and a mixture of the compound represented by Chemical Formula 4 and the compound represented by Chemical Formula 5 as a host. Compared with the OLEDs of Comparative Examples 1 to 4 that use a single material as a host, the OLEDs have a low drive voltage and increased external quantum efficiency (EQE) and lifetime (LT95).

[0307] In an organic light-emitting diode (OLED) according to the present disclosure, by using an organometallic compound represented by Chemical Formula 1 as a phosphorescent dopant and using a mixture of a compound represented by Chemical Formula 4 and a compound represented by Chemical Formula 5 as a phosphorescent host, the efficiency and lifetime characteristics of the OLED can be improved and low-power characteristics can be ensured by reducing the driving voltage.

[0308] The effects obtainable from the present disclosure are not limited to the above effects, and other effects not mentioned will be clearly understood by those skilled in the art to which the present disclosure pertains based on the above description.

[0309] Although the embodiments of the present specification have been described in more detail with reference to the accompanying drawings, the present specification is not necessarily limited to these embodiments, and various modifications can be made without departing from the technical spirit of the present specification. Therefore, the embodiments disclosed in the present specification are not intended to limit the technical spirit of the present specification, but are intended to describe the technical spirit of the present specification, and the scope of the technical spirit of the present specification is not limited by these embodiments. Therefore, it should be understood that the above embodiments are illustrative in all respects and not restrictive. The scope of the present specification should be construed according to the appended claims, and all technical spirits within the equivalent scope should be construed as being included within the scope of the present specification.

[0310] Description of Reference Numerals

[0311] 100, 4000: Organic light-emitting diode (OLED)

[0312] 110, 4100: First electrode

[0313] 120, 4200: Second electrode

[0314] 130, 230, 330, 4300: Intermediate layer

[0315] 140: Hole injection layer

[0316] 150: Hole transport layer, 251: First hole transport layer, 252: Second hole transport layer, 253: Third hole transport layer

[0317] 160: Light-emitting layer, 261: First light-emitting layer, 262: Second light-emitting layer, 263: Third light-emitting layer 160’, 262’: Dopant

[0318] 160”, 262”: Hole transport type host

[0319] 160”’, 262”’: Electron transport type host

[0320] 170: Electron transport layer, 271: First electron transport layer, 272: Second electron transport layer, 273: Third electron transport layer

[0321] 180: Electron injection layer

[0322] 291, 293: N-type charge generation layer

[0323] 292, 294: P-type charge generation layer

[0324] 3000: OLED display device

[0325] 3010: Substrate

[0326] 3100: Semiconductor layer

[0327] 3200: Gate insulating film

[0328] 3300: Gate electrode

[0329] 3400: Interlayer insulating film

[0330] 3420, 3440: First semiconductor layer contact hole and second semiconductor layer contact hole

[0331] 3520: Source electrode

[0332] 3540: Drain electrode

[0333] 3600: Color filter

[0334] 3700: Planarization layer

[0335] 3720: Drain contact hole

[0336] 3800: Bank layer

[0337] 3900: Encapsulation film

Claims

1. An organic light emitting diode, comprising: a first electrode; a second electrode facing the first electrode; and an intermediate layer disposed between the first electrode and the second electrode, wherein the intermediate layer comprises a light-emitting layer, and the light-emitting layer comprises a dopant material and a host material, The dopant material includes an organic metal compound represented by the following Chemical Formula 1, and The host material includes a mixture of a compound represented by the following Chemical Formula 4 and a compound represented by the following Chemical Formula 5: <Chemical Formula 1> M(L A ) m (L B ) n In Chemical Formula 1, M is a central coordination metal and is one selected from the following: molybdenum (Mo); tungsten (W); rhenium (Re); ruthenium (Ru); osmium (Os); rhodium (Rh); iridium (Ir); palladium (Pd); platinum (Pt); and gold (Au), L A is a ligand represented by Chemical Formula 2, L B is a bidentate ligand, m is 1, 2 or 3, n is 0, 1 or 2, and (m+n) is the oxidation number of the central coordination metal M, <Chemical Formula 2> In chemical formula 2, A has a ring structure selected from substituted or unsubstituted pyridine and substituted or unsubstituted pyrimidine, and optionally, A is partially or fully deuterated, R1 to R8 are each independently one selected from the following: hydrogen; deuterium; substituted or unsubstituted C1-C20 linear alkyl; substituted or unsubstituted C3-C20 branched alkyl; and substituted or unsubstituted C4-C20 bicycloalkyl, and optionally, R1 to R8 are partially or fully deuterated, R9 is each independently one selected from the following: hydrogen; deuterium; substituted or unsubstituted C1-C20 linear alkyl; substituted or unsubstituted C3-C20 branched alkyl; substituted or unsubstituted C3-C20 cycloalkyl; halogen; nitrile; substituted or unsubstituted C1-C20 alkoxy; and a group formed by connecting two or more of the above groups; and combinations thereof, and optionally, R9 is partially or fully deuterated, When any one of R1 to R9 is substituted, the substituents of R1 to R9 are each independently at least one selected from deuterium, halogen, C3-C10 cycloalkyl and a group formed by connecting two or more of the above groups; and when there are plural substituents of R1 to R9, each substituent is the same as or different from each other, Y is one selected from the following: BR 10 CR 10 R 11 ; C=O; CNR 10 ;SiR 10 R 11 NR 10 PR 10 ;AsR 10 ;SbR 10 ;P(O)R 10 ;P(S)R 10 ; P(Se)R 10 ;As(O)R 10 ;As(S)R 10 ;As(Se)R 10 ;Sb(O)R 10 ;Sb(S)R 10 ;Sb(Se)R 10 ;O;S;Se;Te;SO;SO2;SeO;SeO2;TeO; and TeO2, X1 to X4 are each independently selected from CR 12 and nitrogen (N), When any two adjacent ones of X1 to X4 are CR 12 When two R 12 are not bonded, or are bonded to form a 5-membered or 6-membered substituted or unsubstituted aromatic ring or aromatic heterocyclic structure; when any two adjacent ones of X1 to X4 are CR 12 and the other is nitrogen (N), R 12 is not bonded to nitrogen, or is bonded to nitrogen to form a 5-membered or 6-membered aromatic heterocyclic structure; and R 12 The aromatic ring or aromatic heterocyclic structure to which it is bonded is unsubstituted or substituted with at least one deuterium, R 10 To R 12 Each is independently at least one selected from the following: hydrogen; deuterium; halogen; hydroxyl; nitro; amidino; hydrazine; hydrazone; substituted or unsubstituted C1-C20 linear alkyl; substituted or unsubstituted C3-C20 branched alkyl; substituted or unsubstituted C3-C20 cycloalkyl; substituted or unsubstituted C1-C20 heteroalkyl; substituted or unsubstituted C7-C20 arylalkyl; substituted or unsubstituted C2-C2 0 alkenyl; substituted or unsubstituted C3-C20 cycloalkenyl; substituted or unsubstituted C2-C20 heteroalkenyl; substituted or unsubstituted C2-C20 alkynyl; substituted or unsubstituted C6-C30 aryl; substituted or unsubstituted C2-C30 heteroaryl; substituted or unsubstituted C1-C20 alkoxy; amino; silyl; C2-C30 acyl; carboxyl; nitrile; isonitrile; thiol; and phosphino, When R 10 To R 12 When any one of R is substituted, 10 To R 12 The substituents of are each independently selected from at least one of deuterium and halogen; and when R 10 To R 12 When there are multiple substituents, the substituents are the same or different from each other. p is 2, and The dotted line indicates the connection position with the central coordination metal M. <Chemical Formula 4> In chemical formula 4, X is O or S, and Plural R 15 Any one of them is represented by the following Chemical Formula 21, and the others are each independently hydrogen or deuterium, <Chemical Formula 21> In Chemical Formula 21, Ar1 and Ar2 are each independently a substituted or unsubstituted C6-C60 aryl group; or a substituted or unsubstituted C2-C60 heteroaryl group; and L4, L5 and L6 are each independently a single bond; a substituted or unsubstituted C6-C60 arylene group; or a substituted or unsubstituted C2-C60 heteroarylene group; <Chemical Formula 5> In Chemical Formula 5, Q is O or S, W are each independently N or CH, provided that at least one of W is N, L1 is a single bond; or a substituted or unsubstituted C6-C60 arylene group; and Ar3 and Ar4 are each independently a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C2-C60 heteroaryl group, a substituted or unsubstituted C3-C60 cycloalkyl group, or a substituted or unsubstituted C2-C60 heterocycloalkyl group, and when Ar3 and Ar4 are each independently a heteroaryl group or a heterocycloalkyl group, Ar3 and Ar4 contain at least one heteroatom selected from N, O, S and combinations thereof.

2. The organic light emitting diode according to claim 1, wherein L in Chemical Formula 1 B It is represented by at least one selected from the following Chemical Formula 3-1 and Chemical Formula 3-2: <Chemical Formula 3-1> <Chemical Formula 3-2> In Chemical Formula 3-1 and Chemical Formula 3-2, Z3 to Z5 are each independently one selected from the following: hydrogen; deuterium; halogen; hydroxyl; nitro; amidino; hydrazine; hydrazone; substituted or unsubstituted C1-C20 linear alkyl; substituted or unsubstituted C3-C20 branched alkyl; substituted or unsubstituted C3-C20 cycloalkyl; substituted or unsubstituted C1-C20 heteroalkyl; substituted or unsubstituted C7-C20 arylalkyl; substituted or unsubstituted C2-C20 alkenyl; substituted or unsubstituted C3-C20 cycloalkenyl; substituted or unsubstituted C2-C20 heteroalkenyl; substituted or unsubstituted C2-C20 alkynyl; substituted or unsubstituted C6-C30 aryl; substituted or unsubstituted C2-C30 heteroaryl; substituted or unsubstituted C1-C20 alkoxy; amino; silyl; acyl; carboxyl; nitrile; isonitrile; thiol; and phosphino, Z6 and Z7 are each independently selected from oxygen (O) and NR z One of them, and R z are each independently one selected from hydrogen, a substituted or unsubstituted C1-C20 linear alkyl group, and a substituted or unsubstituted C3-C20 branched alkyl group, and The dotted line indicates the connection position with the central coordination metal M.

3. The organic light emitting diode according to claim 2, wherein the compound represented by Chemical Formula 1 is a compound represented by one selected from Chemical Formula 1-1-(1), Chemical Formula 1-1-(2), Chemical Formula 1-1-(3), Chemical Formula 1-1-(4), Chemical Formula 1-1-(5), Chemical Formula 1-1-(6), Chemical Formula 1-2-(1), Chemical Formula 1-2-(2), Chemical Formula 1-2-(3), Chemical Formula 1-2-(4), Chemical Formula 1-2-(5), Chemical Formula 1-2-(6), Chemical Formula 1-3-(1), Chemical Formula 1-3-(2), Chemical Formula 1-3-(3), Chemical Formula 1-3-(4), Chemical Formula 1-3-(5), and Chemical Formula 1-3-(6), <Chemical formula 1-1-(1)> <Chemical formula 1-1-(2)> <Chemical formula 1-1-(3)> <Chemical formula 1-1-(4)> <Chemical formula 1-1-(5)> <Chemical formula 1-1-(6)> <Chemical formula 1-2-(1)> <Chemical formula 1-2-(2)> <Chemical formula 1-2-(3)> <Chemical formula 1-2-(4)> <Chemical formula 1-2-(5)> <Chemical formula 1-2-(6)> <Chemical formula 1-3-(1)> <Chemical formula 1-3-(2)> <Chemical formula 1-3-(3)> <Chemical formula 1-3-(4)> <Chemical formula 1-3-(5)> <Chemical formula 1-3-(6)> In Chemical Formula 1-1-(1), Chemical Formula 1-1-(2), Chemical Formula 1-1-(3), Chemical Formula 1-1-(4), Chemical Formula 1-1-(5), Chemical Formula 1-1-(6), Chemical Formula 1-2-(1), Chemical Formula 1-2-(2), Chemical Formula 1-2-(3), Chemical Formula 1-2-(4), Chemical Formula 1-2-(5), Chemical Formula 1-2-(6), Chemical Formula 1-3-(1), Chemical Formula 1-3-(2), Chemical Formula 1-3-(3), Chemical Formula 1-3-(4), Chemical Formula 1-3-(5), and Chemical Formula 1-3-(6), M, X1 to X4, Y, R1 to R9, p, m and n are the same as those in Chemical Formula 1, and Definitions of Z3 to Z7 are the same as those in Chemical Formula 3-1 and Chemical Formula 3-2. The organic light emitting diode according to claim 1 , wherein A in Chemical Formula 2 has a pyridine ring structure. The organic light emitting diode according to claim 1 , wherein M in Chemical Formula 1 is iridium (Ir). 6 . The organic light emitting diode according to claim 1 , wherein Y in Chemical Formula 2 is any one of oxygen (O), sulfur (S) and selenium (Se). 7 . The organic light emitting diode according to claim 1 , wherein at least one of R 9 in Chemical Formula 2 is not hydrogen.

8. The organic light emitting diode according to claim 1, wherein R in Chemical Formula 2 10 To R 12 each independently represents at least one selected from the following: hydrogen, deuterium, halogen, nitrile, nitro, substituted or unsubstituted C1-C20 alkoxy, amino, substituted or unsubstituted C1-C10 linear alkyl, substituted or unsubstituted C3-C10 branched alkyl, and substituted or unsubstituted C3-C10 cycloalkyl.

9. The organic light emitting diode according to claim 1, wherein the organometallic compound represented by Chemical Formula 1 is one selected from the following compounds RD-1 to RD-20:

10. The organic light emitting diode according to claim 1, wherein the compound represented by Chemical Formula 4 is represented by any one of the following Chemical Formulas 4-1 to 4-10: In Chemical Formulas 4-1 to 4-10, X, R 15 , Ar1, Ar2, L4, L5 and L6 are the same as defined in Chemical Formula 4.

11. The organic light emitting diode according to claim 1, wherein Ar1 and Ar2 are each independently phenyl, biphenyl, terphenyl, naphthyl, phenanthryl, (naphthyl)phenyl, (phenyl)naphthyl, fluorenyl, dimethylfluorenyl, dibenzofuranyl, dibenzothiophenyl, carbazolyl, 9-phenylcarbazolyl, benzonaphthofuranyl, or benzonaphthothiophenyl. 12 . The organic light emitting diode according to claim 1 , wherein in Chemical Formula 4, L4 is a single bond, a phenylene group, a biphenyl diyl group, a naphthalene diyl group, or a binaphthyl diyl group.

13. The organic light emitting diode according to claim 1, wherein the compound represented by Chemical Formula 4 is one selected from the following compounds RHH-1 to RHH-20: 14 . The organic light emitting diode according to claim 1 , wherein at least one of Ar3 and Ar4 in Chemical Formula 5 is a deuterium-substituted aryl group, a deuterium-substituted heteroaryl group, a deuterium-substituted cycloalkyl group, or a deuterium-substituted heterocycloalkyl group.

15. The organic light emitting diode according to claim 1, wherein Ar3 and Ar4 are each independently phenyl, biphenyl, terphenyl, naphthyl, phenanthryl, (phenyl)naphthyl, (naphthyl)phenyl, dimethylfluorenyl, diphenylfluorenyl, dibenzofuranyl, dibenzothienyl, carbazole-9-yl, or 9-phenyl-9H-carbazole, and Ar3 and Ar4 are each independently unsubstituted or substituted with at least one deuterium.

16. The organic light emitting diode according to claim 1, wherein the compound represented by Chemical Formula 5 is one selected from the following compounds REH-1 to REH-20: 17 . The organic light emitting diode according to claim 1 , wherein the intermediate layer further comprises at least one selected from the group consisting of a hole injection layer, a hole transport layer, a hole transport auxiliary layer, an electron blocking layer, an electron transport layer, and an electron injection layer.

18. An organic light emitting diode, comprising: a first electrode; a second electrode facing the first electrode; and one or more light emitting portions positioned between the first electrode and the second electrode, wherein at least one of the light-emitting portions comprises a red phosphorescent light-emitting layer, The red phosphorescent light-emitting layer comprises a dopant material and a host material, The dopant material includes an organic metal compound represented by the following Chemical Formula 1, and The host material includes a compound represented by the following Chemical Formula 4 and a compound represented by the following Chemical Formula 5: <Chemical Formula 1> M(L A ) m (L B ) n In Chemical Formula 1, M is a central coordination metal and is one selected from the following: molybdenum (Mo); tungsten (W); rhenium (Re); ruthenium (Ru); osmium (Os); rhodium (Rh); iridium (Ir); palladium (Pd); platinum (Pt); and gold (Au), L A is a ligand represented by Chemical Formula 2, L B is a bidentate ligand, m is 1, 2 or 3, n is 0, 1 or 2, and (m+n) is the oxidation number of the central coordination metal M, <Chemical Formula 2> In chemical formula 2, A has a ring structure selected from substituted or unsubstituted pyridine and substituted or unsubstituted pyrimidine, and optionally, A is partially or fully deuterated, R1 to R8 are each independently one selected from the following: hydrogen; deuterium; substituted or unsubstituted C1-C20 linear alkyl; substituted or unsubstituted C3-C20 branched alkyl; and substituted or unsubstituted C4-C20 bicycloalkyl, and optionally, R1 to R8 are partially or fully deuterated, R9 is each independently one selected from the following: hydrogen; deuterium; substituted or unsubstituted C1-C20 linear alkyl; substituted or unsubstituted C3-C20 branched alkyl; substituted or unsubstituted C3-C20 cycloalkyl; halogen; nitrile; substituted or unsubstituted C1-C20 alkoxy; and a group formed by connecting two or more of the above groups; and combinations thereof, and optionally, R9 is partially or fully deuterated, When any one of R1 to R9 is substituted, the substituents of R1 to R9 are each independently at least one selected from deuterium, halogen, C3-C10 cycloalkyl and a group formed by connecting two or more of the above groups; and when there are plural substituents of R1 to R9, each substituent is the same as or different from each other, Y is one selected from the following: BR 10 CR 10 R 11 ; C=O; CNR 10 ;SiR 10 R 11 NR 10 PR 10 ;AsR 10 ;SbR 10 ;P(O)R 10 ;P(S)R 10 ; P(Se)R 10 ;As(O)R 10 ;As(S)R 10 ;As(Se)R 10 ;Sb(O)R 10 ;Sb(S)R 10 ;Sb(Se)R 10 ;O;S;Se;Te;SO;SO2;SeO;SeO2;TeO; and TeO2, X1 to X4 are each independently selected from CR 12 and nitrogen (N), When any two adjacent ones of X1 to X4 are CR 12 When two R 12 are not bonded, or are bonded to form a 5-membered or 6-membered substituted or unsubstituted aromatic ring or aromatic heterocyclic structure; when any two adjacent ones of X1 to X4 are CR 12 and the other is nitrogen (N), R 12 is not bonded to nitrogen, or is bonded to nitrogen to form a 5-membered or 6-membered aromatic heterocyclic structure; and R 12 The aromatic ring or aromatic heterocyclic structure to which it is bonded is unsubstituted or substituted with at least one deuterium, R 10 To R 12 Each is independently at least one selected from the following: hydrogen; deuterium; halogen; hydroxyl; nitro; amidino; hydrazine; hydrazone; substituted or unsubstituted C1-C20 linear alkyl; substituted or unsubstituted C3-C20 branched alkyl; substituted or unsubstituted C3-C20 cycloalkyl; substituted or unsubstituted C1-C20 heteroalkyl; substituted or unsubstituted C7-C20 arylalkyl; substituted or unsubstituted C2-C2 0 alkenyl; substituted or unsubstituted C3-C20 cycloalkenyl; substituted or unsubstituted C2-C20 heteroalkenyl; substituted or unsubstituted C2-C20 alkynyl; substituted or unsubstituted C6-C30 aryl; substituted or unsubstituted C2-C30 heteroaryl; substituted or unsubstituted C1-C20 alkoxy; amino; silyl; C2-C30 acyl; carboxyl; nitrile; isonitrile; thiol; and phosphino, When R 10 To R 12 When any one of R is substituted, 10 To R 12 The substituents of are each independently selected from at least one of deuterium and halogen; and when R 10 To R 12 When there are multiple substituents, the substituents are the same or different from each other. p is 2, and The dotted line indicates the connection position with the central coordination metal M. <Chemical Formula 4> In chemical formula 4, X is O or S, and Plural R 15 Any one of them is represented by the following Chemical Formula 21, and the others are each independently hydrogen or deuterium, <Chemical Formula 21> In Chemical Formula 21, Ar1 and Ar2 are each independently a substituted or unsubstituted C6-C60 aryl group; or a substituted or unsubstituted C2-C60 heteroaryl group; and L4, L5 and L6 are each independently a single bond; a substituted or unsubstituted C6-C60 arylene group; or a substituted or unsubstituted C2-C60 heteroarylene group; <Chemical Formula 5> In Chemical Formula 5, Q is O or S, W are each independently N or CH, provided that at least one of W is N, L1 is a single bond; or a substituted or unsubstituted C6-C60 arylene group; and Ar3 and Ar4 are each independently a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C2-C60 heteroaryl group, a substituted or unsubstituted C3-C60 cycloalkyl group, or a substituted or unsubstituted C2-C60 heterocycloalkyl group, and when Ar3 and Ar4 are heteroaryl groups or heterocycloalkyl groups, Ar3 and Ar4 contain at least one heteroatom selected from N, O, S and combinations thereof.

19. The organic light emitting diode according to claim 18, wherein a plurality of light emitting portions are present between the first electrode and the second electrode, and The plurality of light-emitting sections form a structure connected by a charge generation layer provided between the plurality of light-emitting sections.

20. An organic light emitting diode display device, comprising: substrate; a drive element positioned on the substrate; as well as An organic light emitting diode according to any one of claims 1 to 19 positioned on the substrate and connected to the driving element.

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