Organic electroluminescent material and device made therefrom

Abstract

Metal complex with general formula Ir(L a ) m (L6) n , where L a and L b a first ligand and a second ligand are coordinated with the metal Ir; m is 1 or 2, n is 1 or 2, and m+n corresponds to the oxidation state of Ir; if m is 2, two L a are the same or different; if n is 2, two L b are the same or different; L a , whether the same or different in each occurrence, exhibits a structure represented by formula 1A, and L b , which, whether the same or different in each occurrence, exhibits a structure represented by the formula 1Ba: where Z is selected from the group consisting of O, S and Se; X3 to X8, the same or different in each occurrence, selected from CR x ; Y1 to Y4, the same or different in each occurrence, are selected from CR y or N; U1 to U4, the same or different for each occurrence, are selected from CR u or N; W1 to W4, the same or different for each occurrence, are selected from CR w or N; R x , R y , R u and R w, the same or different in each occurrence, are selected from the group consisting of: hydrogen, deuterium, substituted or unsubstituted alkyl with 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 20 ring carbon atoms, substituted or unsubstituted arylalkyl with 7 to 30 carbon atoms, substituted or unsubstituted alkenyl with 2 to 20 carbon atoms, substituted or unsubstituted aryl with 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl with 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl with 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl with 6 to 20 carbon atoms, a cyano group, an isocyano group and combinations thereof; one of U1 to U4 from CR u are selected and R usubstituted or unsubstituted alkyl with 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 20 ring carbon atoms or a combination thereof, and the total number of carbon atoms in R u at least 4; at least one of R x Cyano is; and neighboring substituents R x , R y , R u , R w They may be connected to form a ring.

Description

Technical field

[0001] The present disclosure relates to compounds for organic electronic devices such as organic light-emitting devices. In particular, the present disclosure relates to a metal complex comprising a ligand L a with a structure of formula 1A and a ligand L b containing a structure of formula 1Ba, as well as an organic electroluminescent device and a compound composition containing the metal complex background

[0002] Organic electronic devices include, but are not limited to, the following types: organic light-emitting diodes (OLEDs), organic field-effect transistors (O-FETs), organic light-emitting transistors (OLETs), organic photovoltaic devices (OPVs), dye-sensitized solar cells (DSSCs), organic optical detectors, organic photoreceptors, organic field-quench devices (OFQDs), light-emitting electrochemical cells (LECs), organic laser diodes, and organic plasmon-emitting devices.

[0003] In 1987, Tang and Van Slyke of Eastman Kodak reported on a two-layer organic electroluminescent device comprising an arylamine hole transport layer and a tris-8-hydroxyquinolato aluminum layer as the electron and emitting layer (Applied Physics Letters, 1987, 51(12): 913–915). When a bias voltage was applied to the device, it emitted green light. This device laid the foundation for the development of modern organic light-emitting diodes (OLEDs). State-of-the-art OLEDs can have multiple layers, such as charge injection and transport layers, charge and exciton blocking layers, and one or more emitting layers between the cathode and anode. Because the OLED is a self-emitting solid-state device, it offers tremendous potential for display and lighting applications.Furthermore, the inherent properties of organic materials, such as their flexibility, make them well-suited for certain applications, such as manufacturing on flexible substrates.

[0004] OLEDs can be classified into three different types according to their emission mechanism. The OLED invented by Tang and van Slyke is a fluorescent OLED. It uses only singlet emission. The triplets generated in the device are wasted via non-radiative decay channels. Therefore, the internal quantum efficiency (IQE) of the fluorescent OLED is only 25%. This limitation hampered the commercialization of OLEDs. In 1997, Forrest and Thompson reported a phosphorescent OLED that uses triplet emission from heavy metal-containing complexes as emitters. This allows both singlets and triplets to be harvested, achieving an IQE of 100%. The discovery and development of phosphorescent OLEDs, due to their high efficiency, directly contributed to the commercialization of active-matrix OLEDs (AMOLEDs).Recently, Adachi achieved high efficiency through thermally activated delayed fluorescence (TADF) of organic compounds. These emitters exhibit a small singlet-triplet gap that allows the transition from triplet back to singlet. In the TADF device, the triplet excitons can undergo reverse intersystem crossing to generate singlet excitons, resulting in a high interquantum emission (IQE).

[0005] OLEDs can also be classified as small-molecule and polymer OLEDs, depending on the shapes of the materials used. A small molecule refers to any organic or organometallic material that is not a polymer. The molecular mass of a small molecule can be large, provided it has a well-defined structure. Dendrimers with well-defined structures are considered small molecules. Polymer OLEDs include conjugated polymers and non-conjugated polymers with emitting side groups. A small-molecule OLED can become a polymer OLED if post-polymerization occurs during the fabrication process.

[0006] There are various methods for manufacturing OLEDs. Low-molecular-weight OLEDs are generally produced by thermal vacuum evaporation. Polymer OLEDs are manufactured using solution-based processes such as spin coating, inkjet printing, and slot printing. If the material can be dissolved or dispersed in a solvent, the low-molecular-weight OLED can also be manufactured using a solution-based process.

[0007] The emission color of an OLED can be achieved through the design of the emitter. An OLED can have one or more emitting layers to achieve the desired spectrum. Phosphorescent emitters have been successfully commercialized for green, yellow, and red OLEDs. Blue phosphorescent devices still suffer from an unsaturated blue color, a short device lifespan, and high operating voltage requirements. Commercially available OLED color displays typically employ a hybrid strategy, using fluorescent blue and phosphorescent yellow or red and green. Currently, the efficiency drop of phosphorescent OLEDs at high brightness levels remains a problem. Furthermore, a more saturated emission color, higher efficiency, and a longer device lifespan are desirable.

[0008] Cyano substitutions are generally not introduced into phosphorescent metal complexes such as iridium complexes. US 2014 / 0 252 333 A1 discloses a number of iridium complexes with cyano and phenyl substitutions and has not shown any clear effect of cyano groups. Additionally, since cyano is a highly electron-withdrawing substituent, it is also used to shift the emission spectrum of a phosphorescent metal complex towards blue, as described in US 2004 / 0 121 184 A1. An earlier application, US 2020 / 0 251 666 A1, of the applicant in the present application discloses a metal complex with a cyano-substituted ligand. The metal complex is applicable to an organic electroluminescence device and can improve the device's performance and color saturation to a relatively high level in industry, but further improvements are needed.

[0009] Alkyl substitutions are generally introduced into phosphorescent metal complexes such as iridium complexes to emit red light. US 2014 / 0231755A1 states that deuterated methyl at position 5 of 2-phenylpyridine can improve the lifetime of a device.

[0010] DE 10 2020 209 376 A1 discloses a series of iridium complexes, wherein the L b exhibit a general structure and R a Generally disclosed as selected from alkyl or cycloalkyl. However, this application does not disclose a compound having a specific alkyl or cycloalkyl substitution on the pyridine ring of phenylpyridine, wherein the number of carbon atoms in the substituent is at least 4. Summary

[0011] The present disclosure aims to provide a series of metal complexes, each comprising a ligand L awith a structure of formula 1A and a ligand L b with a structure of formula 1Ba, in order to solve at least some of the preceding problems. These metal complexes can be used as light-emitting materials in electroluminescent devices. These new compounds can achieve a higher sublimation yield and have a lower evaporation temperature. These metal complexes are suitable for electroluminescent devices and can provide improved device performance, such as an increased device lifetime and a lower full width at half maximum (FWHM).

[0012] According to one embodiment of the present invention, a metal complex with a general formula Ir(L a ) m (L e ) n provided, where L a and L ba first ligand and a second ligand are coordinated with the metal Ir; m is 1 or 2, n is 1 or 2, and m+n corresponds to the oxidation state of Ir; if m is 2, then there are two L a same or different; if n is 2, then two L are the same. b same or different; L a Each occurrence exhibits the same or different structure, represented by the formula of formula 1A, and L b Each occurrence exhibits an identical or different structure, represented by formula 1B: where Z is selected from the group consisting of O, S and Se; X3 to X8, the same or different in each occurrence, selected from CR x ; Y1 to Y4, the same or different in each occurrence, are selected from CR y or N; U1 to U4, the same or different for each occurrence, are selected from CR u or N; W1 to W4, the same or different for each occurrence, are selected from CR w or N; R x , R y , R u and R w , the same or different in each occurrence, are selected from the group consisting of: hydrogen, deuterium, substituted or unsubstituted alkyl with 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 20 ring carbon atoms, substituted or unsubstituted arylalkyl with 7 to 30 carbon atoms, substituted or unsubstituted alkenyl with 2 to 20 carbon atoms, substituted or unsubstituted aryl with 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl with 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl with 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl with 6 to 20 carbon atoms, a cyano group, an isocyano group and combinations thereof; one of U1 to U4 are selected from CR u and R u substituted or unsubstituted alkyl with 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 20 ring carbon atoms or a combination thereof, and the total number of carbon atoms in R u at least 4; at least one of R x a cyanogroup; and neighboring substituents R x , R y , R u , R w They may be connected to form a ring.

[0013] According to another embodiment of the present disclosure, an electroluminescence device is further provided, comprising: an anode a cathode, and an organic layer arranged between the anode and the cathode, wherein at least one layer of the organic layer contains the metal complex of the preceding embodiment.

[0014] According to another embodiment of the present disclosure, a compound composition comprising the metal complex of the preceding embodiment is further provided.

[0015] The present disclosure provides a series of metal complexes, each comprising a ligand L a with a structure of formula 1A and a ligand L b containing a structure of formula 1B, wherein a specific substituent is present in the ligand L a is introduced and cyano in the ligand L bThese new compounds are introduced so that they can achieve a higher sublimation yield during sublimation and exhibit a lower evaporation temperature. These metal complexes can be used as light-emitting materials in electroluminescent devices. These metal complexes are suitable for electroluminescent devices and can improve the device's performance, for example, by increasing its lifetime and reducing its FWHM (Full Wavelength Temperature). Brief description of the drawings Fig. Figure 1 shows a schematic diagram of an organic light-emitting device which may contain a metal complex and a compound composition disclosed herein. Fig. Figure 2 shows a schematic diagram of another organic light-emitting device which may contain a metal complex and a compound composition disclosed herein. Detailed description

[0016] OLEDs can be manufactured on various types of substrates such as glass, plastic and metal foil. Fig.Figure 1 schematically depicts an organic light-emitting device 100 without restriction. The figures are not necessarily drawn to scale. Some of the layers shown in the figures may be omitted if necessary. The device 100 may comprise a substrate 101, an anode 110, a hole injection layer 120, a hole transport layer 130, an electron blocking layer 140, an emitting layer 150, a hole blocking layer 160, an electron transport layer 170, an electron injection layer 180, and a cathode 190. The device 100 can be fabricated by depositing the described layers in this order. The properties and functions of these various layers, as well as exemplary materials, are described in more detail in US 2005 / 0260449A1 in columns 6 to 10.

[0017] Further examples of each of these layers are available. For example, a flexible and transparent substrate-anode combination is disclosed in US 5,844,363 A. An example of a p-doped hole transport layer is m-MTDATA doped with F4-TCNQ in a molar ratio of 50:1, as disclosed in US 2003 / 0230980A1. Examples of host materials are disclosed in US 6,303,238B1 by Thompson et al. An example of an n-doped electron transport layer is BPhen doped with Li in a molar ratio of 1:1, as disclosed in US 2003 / 0230980A1. US patents US 5,703,436 A and US 5,707,745 A disclose examples of cathodes, including composite cathodes, that have a thin metal layer, such as Mg:Ag, with an overlying transparent, electrically conductive ITO layer deposited by sputtering. The theory and use of blocking layers are described in more detail in US 6,097,147 A and US 2003 / 0230,980 A1.Examples of injection layers are provided in US 2004 / 0174116A1. A description of protective layers can be found in US 2004 / 0174116A1.

[0018] The layer structure described above is provided by non-exhaustive examples. Functional OLEDs can be achieved by combining the various described layers in different ways, or layers can be omitted entirely. It can also include other layers not specifically described. Within each layer, a single material or a mixture of several materials can be used to achieve optimal performance. Each functional layer can contain multiple sublayers. For example, the emitting layer can have two layers of different emitting materials to achieve the desired emission spectrum.

[0019] In one embodiment, an OLED can be described as having an "organic layer" arranged between a cathode and an anode. This organic layer can consist of a single layer or multiple layers.

[0020] An OLED can be encapsulated by a barrier layer. Fig. Figure 2 schematically represents an organic light-emitting device 200 without restriction. Fig. 2 differs from Fig.1. The organic light-emitting device includes a barrier layer 102 located above the cathode 190 to protect it from harmful environmental species such as moisture and oxygen. Any material capable of providing the barrier function can be used, for example, glass or organic-inorganic hybrid layers. The barrier layer should be placed directly or indirectly outside the OLED device. A multilayer thin-film encapsulation was described in US 2008 / 0237 181 A1.

[0021] Devices manufactured according to embodiments of the present disclosure can be integrated into a wide variety of consumer products that incorporate one or more modules (or units) of electronic components. Some examples of such consumer products include flat panel displays, monitors, medical monitors, televisions, billboards, indoor or outdoor lighting fixtures and / or signaling devices, field-of-view displays, fully or partially transparent displays, flexible displays, smartphones, tablets, phablets, wearable devices, smartwatches, laptop computers, digital cameras, camcorders, viewfinders, microdisplays, 3D displays, vehicle displays, and vehicle taillights.

[0022] The materials and structures described herein may be used in other organic electronic devices listed above.

[0023] As used here, "above" means furthest from the substrate, whereas "below" means closest to the substrate. When a first layer is described as "arranged above" a second layer, the first layer is arranged farther from the substrate. Other layers may be located between the first and second layers unless it is specified that the first layer is "in contact with" the second layer. For example, a cathode may be described as "arranged above" an anode even though various organic layers are located between them.

[0024] As used herein, “solution-processable” means the ability to be dissolved, dispersed or transported and / or separated from a liquid medium, either in solution or suspension form.

[0025] A ligand can be described as "photoactive" if it is assumed that the ligand directly contributes to the photoactive properties of an emitting material. A ligand can be described as "helper" if it is assumed that the ligand does not contribute to the photoactive properties of an emitting material, although a helper ligand can modify the properties of a photoactive ligand.

[0026] It is assumed that the internal quantum efficiency (IQE) of fluorescent OLEDs can exceed the spin statistics limit of 25% through delayed fluorescence. As used here, two types of delayed fluorescence are present: P-type delayed fluorescence and E-type delayed fluorescence. P-type delayed fluorescence is generated by triplet-triplet annihilation (TTA).

[0027] In contrast, E-type delayed fluorescence is not based on the collision of two triplets, but rather on the transition between triplet states and excited singlet states. Compounds capable of generating E-type delayed fluorescence must have very small singlet-triplet gaps to convert between energy states. Thermal energy can activate the transition from the triplet state back to the singlet state. This type of delayed fluorescence is also known as thermally activated delayed fluorescence (TADF). A special characteristic of TADF is that the delayed component increases with increasing temperature.If the reverse intersystem crossing rate is high enough to minimize non-radiative decay from the triplet state, the fraction of reoccupied excited singlet states can potentially reach 75%. The total singlet fraction can be 100%, far exceeding the 25% spin statistics limit for electrically generated excitons.

[0028] Delayed E-type fluorescence properties can be found in an exciplex system or in a single compound. While not bound to any specific theory, it is generally accepted that delayed E-type fluorescence requires the luminescent material to have a small singlet-triplet energy gap (ΔE). S-TOrganic, non-metallic, luminescent donor-acceptor materials may be able to achieve this. The emission in these materials is generally referred to as donor-acceptor charge transfer (CT) type emission. The spatial separation of the HOMO and LUMO in these donor-acceptor-type compounds generally results in a small ΔE S-T These states can be associated with CT states. In general, luminescent donor-acceptor materials are prepared by combining an electron donor unit, such as amino or carbazole derivatives, with an electron acceptor unit, such as nitrogen-containing six-membered aromatic rings. Definition of terms related to substituents

[0029] Halogen or halide - as it is used here - includes fluorine, chlorine, bromine and iodine.

[0030] Alkyl – as used here – includes both straight-chain and branched-chain alkyl groups. Alkyl can be alkyl with 1 to 20 carbon atoms, preferably alkyl with 1 to 12 carbon atoms, and even more preferably alkyl with 1 to 6 carbon atoms. Examples of alkyl groups include a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, an s-butyl group, an isobutyl group, a t-butyl group, an n-pentyl group, an n-hexyl group, an n-heptyl group, an n-octyl group, an n-nonyl group, an n-decyl group, an n-undecyl group, an n-dodecyl group, an n-tridecyl group, an n-tetradecyl group, an n-pentadecyl group, an n-hexadecyl group, an n-heptadecyl group, an n-octadecyl group, a neopentyl group, a 1-methylpentyl group, a 2-methylpentyl group, a 1-pentylhexyl group, a 1-butylpentyl group, a 1-Heptyloctyl group and a 3-methylpentyl group.Of the above, a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, an s-butyl group, an isobutyl group, a t-butyl group, an n-pentyl group, a neopentyl group, and an n-hexyl group are preferred. Additionally, the alkyl group may optionally be substituted.

[0031] Cycloalkyl – as used here – comprises cyclic alkyl groups. The cycloalkyl groups can be those with 3 to 20 ring carbon atoms, preferably those with 4 to 10 carbon atoms. Examples of cycloalkyl include cyclobutyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4,4-dimethylcyclohexyl, 1-adamantyl, 2-adamantyl, 1-norbornyl, 2-norbornyl, and the like. Of the above, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, and 4,4-dimethylcyclohexyl are preferred. Additionally, the cycloalkyl group may optionally be substituted.

[0032] Heteroalkyl – as used here – comprises a group formed by replacing one or more carbon atoms in an alkyl chain with one or more heteroatoms selected from the group consisting of a nitrogen atom, an oxygen atom, a sulfur atom, a selenium atom, a phosphorus atom, a silicon atom, a germanium atom, and a boron atom. Heteroalkyl may contain 1 to 20 carbon atoms, preferably 1 to 10 carbon atoms, and more preferably 1 to 6 carbon atoms.Examples of heteroalkyl groups include methoxymethyl, ethoxymethyl, ethoxyethyl, methylthiomethyl, ethylthiomethyl, ethylthioethyl, methoxymethoxymethyl, ethoxymethoxymethyl, ethoxyethoxyethyl, hydroxymethyl, hydroxyethyl, hydroxypropyl, mercaptomethyl, mercaptoethyl, mercaptopropyl, aminomethyl, aminoethyl, aminopropyl, dimethylaminomethyl, trimethylsilyl, dimethylethylsilyl, dimethylisopropylsilyl, t-butyldimethylsilyl, triethylsilyl, triisopropylsilyl, trimethylsilylmethyl, trimethylsilylethyl, and trimethylsilylisopropyl. The heteroalkyl group may also be substituted.

[0033] Alkenyl – as used here – comprises both straight-chain and branched-chain alkene groups. Alkenyl groups can have 2 to 20 carbon atoms, preferably those with 2 to 10 carbon atoms. Examples of alkenyl vinyl, 1-propenyl group, 1-butenyl, 2-butenyl, 3-butenyl, 1,3-butanedienyl, 1-methylvinyl, styryl, 2,2-diphenylvinyl, 1,2-diphenylvinyl, 1-methylallyl, 1,1-dimethylallyl, 2-methylallyl, 1-phenylallyl, 2-phenylallyl, 3-phenylallyl, 3,3-diphenylallyl, 1,2-dimethylallyl, 1-phenyl-1-butenyl, 3-phenyl-1-butenyl, cyclopentenyl, cyclopentadienyl, cyclohexenyl, cycloheptenyl, cycloheptatrienyl, cyclooctenyl, cyclooctatetraenyl and norbornenyl. In addition, the alkenyl group may optionally be substituted.

[0034] Alkynyl, as used here, comprises both straight-chain and branched-chain alkyne groups. Alkynyl groups can have 2 to 20 carbon atoms, preferably 2 to 10 carbon atoms. Examples of alkynyl groups include ethynyl, propynyl, propargyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-pentynyl, 2-pentynyl, 3,3-dimethyl-1-butynyl, 3-ethyl-3-methyl-1-pentynyl, 3,3-diisopropyl-1-pentynyl, phenylethynyl, phenylpropynyl, etc. Of the above, ethynyl, propynyl, propargyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-pentynyl, and phenylethynyl are preferred. Additionally, the alkynyl group may be substituted.

[0035] Aryl or aromatic group – as used here – includes non-condensed and condensed systems. Preferred aryl groups are those with 6 to 30 carbon atoms, preferably 6 to 20 carbon atoms, and even more preferably 6 to 12 carbon atoms. Examples of the aryl group include phenyl, biphenyl, terphenyl, triphenylene, tetraphenylene, naphthalene, anthracene, phenalen, phenanthrene, fluorene, pyrene, chrysene, perylene, and azulene, preferably phenyl, biphenyl, terphenyl, triphenylene, fluorene, and naphthalene. Examples of non-fused aryl groups include phenyl, biphenyl-2-yl, biphenyl-3-yl, biphenyl-4-yl, p-terphenyl-4-yl, p-terphenyl-3-yl, p-terphenyl-2-yl, m-terphenyl-4-yl, m-terphenyl-3-yl, m-terphenyl-2-yl, o-tolyl, m-tolyl, p-tolyl, p-(2-phenylpropyl)phenyl, 4'-methylbiphenylyl, 4'-t-butyl-p-terphenyl-4-yl, o-cumenyl, m-cumenyl, p-cumenyl, 2,3-xylyl, 3,4-xylyl, 2,5-xylyl, mesityl, and m-quarterphenyl. Additionally, the aryl group may optionally be substituted.

[0036] Heterocyclic group, or heterocycle as used here, comprises non-aromatic cyclic groups. Non-aromatic heterocyclic groups include saturated heterocyclic groups with 3 to 20 ring atoms and unsaturated non-aromatic heterocyclic groups with 3 to 20 ring atoms, wherein at least one ring atom is selected from the group consisting of a nitrogen atom, an oxygen atom, a sulfur atom, a selenium atom, a silicon atom, a phosphorus atom, a germanium atom, and a boron atom. Preferred non-aromatic heterocyclic groups are those with 3 to 7 ring atoms, each of which contains at least one heteroatom such as nitrogen, oxygen, silicon, or sulfur.Examples of non-aromatic heterocyclic groups are oxiranyl, oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, dioxolanyl, dioxanyl, aziridinyl, dihydropyrrolyl, tetrahydropyrrolyl, piperidinyl, oxazolidinyl, morpholinyl, piperazinyl, oxepinyl, thiepinyl, azepinyl, and tetrahydrosilolyl. The heterocyclic group may also be substituted.

[0037] Heteroaryl – as used here – comprises non-condensed and condensed heteroaromatic groups, comprising 1 to 5 heteroatoms, wherein at least one heteroatom is selected from the group consisting of a nitrogen atom, an oxygen atom, a sulfur atom, a selenium atom, a silicon atom, a phosphorus atom, a germanium atom, and a boron atom. A heteroaromatic group is also referred to as a heteroaryl. A heteroaryl can be a group with 3 to 30 carbon atoms, preferably a group with 3 to 20 carbon atoms, and even more preferably a group with 3 to 12 carbon atoms.Suitable heteroaryl groups include dibenzothiophene, dibenzofuran, dibenzoselenophene, furan, thiophene, benzofuran, benzothiophene, benzoselenophene, carbazole, indolocarbazole, pyridylindole, pyrrolodipyridine, pyrazole, imidazole, triazole, oxazole, thiazole, oxadiazole, oxatriazole, dioxazole, thiadiazole, pyridine, Pyridazine, pyrimidine, pyrazine, triazine, oxazine, oxathiazine, oxadiazine, indole, benzimidazole, indazole, indoxazine, benzoxazole, benzisoxazole, benzothiazole, quinoline, isoquinoline, cinnoline, quinazoline, quinoxaline, naphthyridine, phthalazine, pteridine, xanthene, acridine, phenazine, phenothiazine, benzofuropyridine, furodipyridine, Benzothienopyridine, thienodipyridine, benzoselenophenopyridine and selenophenodipyridine, preferably dibenzothiophene, dibenzofuran, dibenzoselenophene, carbazole, indolocarbazole, imidazole, pyridine, triazine, benzimidazole, 1,2-azaborine, 1,3-azaborine, 1,4-azaborine, borazine and aza analogues thereof. The heteroaryl group may optionally be substituted.

[0038] Alkoxy, as used here, is represented by an -O-alkyl, -O-cycloalkyl, -O-heteroalkyl, or -O-heterocyclic group. Examples and preferred examples of alkyl, cycloalkyl, heteroalkyl, and heterocyclic groups are the same as those described above. Alkoxy groups can be those with 1 to 20 carbon atoms, preferably those with 1 to 6 carbon atoms. Examples of alkoxy groups are methoxy, ethoxy, propoxy, butoxy, pentyloxy, hexyloxy, cyclopropyloxy, cyclobutyloxy, cyclopentyloxy, cyclohexyloxy, tetrahydrofuranyloxy, tetrahydropyranyloxy, methoxypropyloxy, ethoxyethyloxy, methoxymethyloxy, and ethoxymethyloxy. Additionally, the alkoxy group can optionally be substituted.

[0039] Aryloxy – as used here – is represented by -O-aryl or -O-heteroaryl. Examples and preferred examples are the same as those described above. Aryloxy groups can contain 6 to 30 carbon atoms, preferably 6 to 20 carbon atoms. Examples of aryloxy groups are phenoxy and biphenyloxy. Furthermore, the aryloxy group can optionally be substituted.

[0040] Arylalkyl – as used here – comprises alkyl substituted with an aryl group. Arylalkyl can contain 7 to 30 carbon atoms, preferably 7 to 20 carbon atoms, and more preferably 7 to 13 carbon atoms.Beispiele für Arylalkylgruppen umfassen Benzyl, 1-Phenylethyl, 2-Phenylethyl, 1-Phenylisopropyl, 2-Phenylisopropyl, Phenyl-t-butyl, alpha-Naphthylmethyl, 1-alpha-Naphthylethyl, 2-alpha-Naphthylethyl, 1-alpha-Naphthylisopropyl, 2-alpha-Naphthylisopropyl, beta-Naphthylmethyl, 1-beta-Naphthylethyl, 2-beta-Naphthylethyl, 1-beta-Naphthylisopropyl, 2-beta-Naphthylisopropyl, p-Methylbenzyl, m-Methylbenzyl, o-Methylbenzyl, p-Chlorbenzyl, m-Chlorbenzyl, o-Chlorbenzyl, p-Brombenzyl, m-Brombenzyl, o-Brombenzyl, p-Iodbenzyl, m-Iodbenzyl, o-Iodbenzyl, p-Hydroxybenzyl, m-Hydroxybenzyl, o-Hydroxybenzyl, p-Aminobenzyl, m-Aminobenzyl, o-Aminobenzyl, p-Nitrobenzyl, m-Nitrobenzyl, o-Nitrobenzyl, p-Cyanobenzyl, m-Cyanobenzyl, o-Cyanobenzyl, 1-Hydroxy-2-phenylisopropyl, und 1-Chlor-2-phenylisopropyl. Von den oben genannten Gruppen sind Benzyl, p-Cyanobenzyl, m-Cyanobenzyl, o-Cyanobenzyl, 1-Phenylethyl, 2-Phenylethyl, 1-Phenylisopropyl und 2-Phenylisopropyl bevorzugt.Additionally, the arylalkyl group may optionally be substituted.

[0041] Alkylsilyl – as used here – comprises a silyl group substituted with an alkyl group. Alkylsilyl groups can have 3 to 20 carbon atoms, preferably 3 to 10. Examples of alkylsilyl groups include trimethylsilyl, triethylsilyl, methyldiethylsilyl, ethyldimethylsilyl, tripropylsilyl, tributylsilyl, triisopropylsilyl, methyldiisopropylsilyl, dimethylisopropylsilyl, tri-t-butylsilyl, triisobutylsilyl, dimethyl-t-butylsilyl, and methyldi-t-butylsilyl. The alkylsilyl group may optionally be substituted.

[0042] Arylsilyl – as used here – comprises a silyl group substituted with an aryl group. Arylsilyl groups can have 6 to 30 carbon atoms, preferably 8 to 20. Examples of arylsilyl groups include triphenylsilyl, phenyldibiphenylylsilyl, diphenylbiphenylsilyl, phenyldiethylsilyl, diphenylethylsilyl, phenyldimethylsilyl, diphenylmethylsilyl, phenyldiisopropylsilyl, diphenylisopropylsilyl, diphenylbutylsilyl, diphenylisobutylsilyl, and diphenyl-t-butylsilyl. The arylsilyl group may optionally be substituted.

[0043] The term “aza” in azadibenzofuran, azadibenzothiophene, etc., means that one or more of the CH groups in the respective aromatic fragment are replaced by a nitrogen atom. For example, dibenzo[f,h]quinoxaline, dibenzo[f,h]quinoline, and other analogues with two or more nitrogens in the ring system are included. A person skilled in the art can readily imagine other nitrogen analogues of the aza derivatives described above, and all such analogues are intended to be included within the terms set forth herein.

[0044] In the present disclosure, unless otherwise defined, when any term of the group consisting of substituted alkyl, substituted cycloalkyl, substituted heteroalkyl, substituted heterocyclic group, substituted arylalkyl, substituted alkoxy, substituted aryloxy, substituted alkenyl, substituted alkynyl, substituted aryl, substituted heteroaryl, substituted alkylsilyl, substituted arylsilyl, substituted amino, substituted acyl, substituted carbonyl, a substituted carboxylic acid group, a substituted ester group, substituted sulfinyl, substituted sulfonyl, and substituted phosphino is used, it means any group consisting of alkyl, cycloalkyl, heteroalkyl, heterocyclic group, arylalkyl, alkoxy, aryloxy, alkenyl, alkynyl, aryl, heteroaryl, Alkylsilyl, arylsilyl, amine, acyl, carbonyl, a carboxylic acid group, an ester group, sulfinyl,Sulfonyl and phosphino may be substituted with one or more groups, selected from the group consisting of deuterium, halogen, unsubstituted alkyl with 1 to 20 carbon atoms, unsubstituted cycloalkyl with 3 to 20 ring carbon atoms, unsubstituted heteroalkyl with 1 to 20 carbon atoms, an unsubstituted heterocyclic group with 3 to 20 ring atoms, unsubstituted arylalkyl with 7 to 30 carbon atoms, unsubstituted alkoxy with 1 to 20 carbon atoms, unsubstituted aryloxy with 6 to 30 carbon atoms, unsubstituted alkenyl with 2 to 20 carbon atoms, unsubstituted alkynyl with 2 to 20 carbon atoms, unsubstituted aryl with 6 to 30 carbon atoms, unsubstituted heteroaryl with 3 to 30 carbon atoms, unsubstituted alkylsilyl with 3 to 20 carbon atoms, unsubstituted arylsilyl with 6 to 20 carbon atoms, unsubstituted amino with 0 to 20 carbon atoms, an acyl group,a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a sulfanyl group, a sulfinyl group, a sulfonyl group, a phosphino group and combinations thereof.

[0045] It is understood that when a molecular fragment is described as a substituent or otherwise bound to another unit, its name may be written as if it were a fragment (e.g., phenyl, phenylene, naphthyl, dibenzofuryl) or as if it were the entire molecule (e.g., benzene, naphthalene, dibenzofuran). As used herein, these different ways of naming a substituent or a bound fragment are considered equivalent.

[0046] In the compounds mentioned in the present disclosure, the hydrogen atoms can be partially or completely replaced by deuterium. Other atoms, such as carbon and nitrogen, can also be replaced by their other stable isotopes. Replacement by other stable isotopes in the compounds may be preferred due to the improvements in the efficiency and stability of the device.

[0047] In the compounds mentioned in this disclosure, multiple substitutions refer to a range encompassing di-substitution up to the maximum available substitutions. When a substitution in the compounds mentioned in this disclosure represents multiple substitutions (including di-, tri-, tetra-substitutions, etc.), this means that the substituent can be present at a plurality of available substitution positions on its linkage structure, and the substituents present at a plurality of available substitution positions may have the same or different structures.

[0048] In the compounds mentioned in this disclosure, adjacent substituents cannot be linked together to form a ring unless expressly defined otherwise, for example, that adjacent substituents may optionally be linked to form a ring. In the compounds mentioned in this disclosure, the expression that adjacent substituents may optionally be linked to form a ring includes both the case where adjacent substituents may be linked to form a ring and the case where adjacent substituents are not linked to form a ring. If adjacent substituents may optionally be linked to form a ring, the resulting ring may be monocyclic or polycyclic, as well as alicyclic, heteroalicyclic, aromatic, or heteroaromatic.In this context, neighboring substituents can refer to substituents bonded to the same atom, to substituents bonded to carbon atoms that are directly bonded to each other, or to substituents bonded to carbon atoms that are further apart. Preferably, neighboring substituents refer to substituents bonded to the same carbon atom and to substituents bonded to carbon atoms that are directly bonded to each other.

[0049] The expression that neighboring substituents can be linked in such a way as to form a ring is also meant to mean that two substituents bonded to the same carbon atom can be linked together via a chemical bond in such a way as to form a ring, which can be exemplified by the following formula:

[0050] The expression that neighboring substituents can optionally be linked to form a ring is also meant to mean that two substituents bonded to directly adjacent carbon atoms are linked together via a chemical bond, forming a ring, which can be exemplified by the following formula:

[0051] Furthermore, the expression that adjacent substituents can optionally be linked to form a ring is also meant to imply that if one of the two substituents bonded to carbon atoms, which are directly bonded to each other, represents hydrogen, the second substituent is bonded at a position where the hydrogen atom is bonded, thus forming a ring. This is illustrated by the following formula:

[0052] According to one embodiment of the present disclosure, a metal complex with a general formula Ir(L a ) m (L b ) n provided, where L a and L b a first ligand and a second ligand are coordinated with the metal Ir; m is 1 or 2, n is 1 or 2, and m+n corresponds to the oxidation state of Ir; if m is 2, two L a are the same or different; if n is 2, two L b are the same or different; L a , whether the same or different in each occurrence, exhibits a structure represented by formula 1A, and L b , whether the same or different in each occurrence, exhibits a structure represented by formula 1B: where Z is selected from the group consisting of O, S and Se; X3 to X8, the same or different in each occurrence, selected from CR x; Y1 to Y4, the same or different in each occurrence, are selected from CR y or N; U1 to U4, the same or different for each occurrence, are selected from CR u or N; W1 to W4, the same or different for each occurrence, are selected from CR w or N; R x , R y , R u and R w, the same or different in each occurrence, are selected from the group consisting of: hydrogen, deuterium, substituted or unsubstituted alkyl with 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 20 ring carbon atoms, substituted or unsubstituted arylalkyl with 7 to 30 carbon atoms, substituted or unsubstituted alkenyl with 2 to 20 carbon atoms, substituted or unsubstituted aryl with 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl with 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl with 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl with 6 to 20 carbon atoms, a cyano group, an isocyano group and combinations thereof; one of U1 to U4 from CR u are selected and R usubstituted or unsubstituted alkyl with 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 20 ring carbon atoms or a combination thereof, and the total number of carbon atoms in R u at least 4; at least one of R x Cyano is; and neighboring substituents R x , R y , R u , R w They may be connected to form a ring.

[0053] In this embodiment, the expression that “adjacent substituents R” is intended to x , R y , R u , R w “may be connected to form a ring” means that one or more groups of adjacent substituents, such as two substituents R x , two substituents R y , two substituents R u , two substituents R w , two substituents R w and R uand two substituents R y and R x They can be linked together to form a ring. Of course, it is possible that none of these substituents are linked together to form a ring.

[0054] According to one embodiment of the present disclosure, the metal complex has a structure represented by formula 2: wherein m is selected from 2; if m = 2, two L a are the same or different; Z is selected from the group consisting of O, S and Se; X3 to X8, the same or different in each occurrence, selected from CR x ; Y1 to Y4, the same or different in each occurrence, are selected from CR y ; U1 to U4, the same or different for each occurrence, are selected from CR u ; W1 to W4, the same or different for each occurrence, are selected from CR w ; R x , R y , Ru and R w , the same or different in each occurrence, are selected from the group consisting of: hydrogen, deuterium, substituted or unsubstituted alkyl with 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 20 ring carbon atoms, substituted or unsubstituted arylalkyl with 7 to 30 carbon atoms, substituted or unsubstituted alkenyl with 2 to 20 carbon atoms, substituted or unsubstituted aryl with 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl with 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl with 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl with 6 to 20 carbon atoms, a cyano group, an isocyano group and combinations thereof; one of U1 to U4 from CR u are selected and R usubstituted or unsubstituted alkyl with 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 20 ring carbon atoms or a combination thereof, and the total number of carbon atoms in R u at least 4; at least one of R x Cyano is; and neighboring substituents R x , R y , R u , R w They may be connected to form a ring.

[0055] In this embodiment, the expression that “adjacent substituents R” is intended to x , R y , R u “may be connected to form a ring” means that one or more groups of adjacent substituents, such as two substituents R x , two substituents R y , two substituents R u and two substituents R y and R xThey can be connected to form a ring. Of course, it is also possible that none of these substituents are connected to form a ring.

[0056] According to one embodiment of the present disclosure, wherein Z is selected from O or S.

[0057] According to one embodiment of the present disclosure, wherein ZO is.

[0058] According to one embodiment of the present disclosure, wherein one of R x Cyano is; and at least one other of R xselected is from the group consisting of: deuterium, substituted or unsubstituted alkyl with 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 20 ring carbon atoms, substituted or unsubstituted arylalkyl with 7 to 30 carbon atoms, substituted or unsubstituted alkenyl with 2 to 20 carbon atoms, substituted or unsubstituted aryl with 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl with 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl with 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl with 6 to 20 carbon atoms, a cyano group, an isocyano group and combinations thereof.

[0059] According to one embodiment of the present disclosure, wherein one of R x Cyano is; and at least one other of R xselected is from the group consisting of: deuterium, substituted or unsubstituted alkyl with 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 20 ring carbon atoms, substituted or unsubstituted aryl with 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl with 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl with 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl with 6 to 20 carbon atoms, a cyano group and combinations thereof.

[0060] According to one embodiment of the present disclosure, wherein one of R x Cyano is; and at least one other of R xselected is from the group consisting of: deuterium, substituted or unsubstituted alkyl with 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 20 ring carbon atoms, substituted or unsubstituted aryl with 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl with 3 to 30 carbon atoms and combinations thereof.

[0061] According to one embodiment of the present disclosure, one of R x Cyano and at least one other from R x selected is from the group consisting of: substituted or unsubstituted aryl with 6 to 15 carbon atoms, substituted or unsubstituted heteroaryl with 3 to 15 carbon atoms and combinations thereof.

[0062] According to one embodiment of the present disclosure, wherein one of R x Cyano is and at least one other of R xselected from substituted or unsubstituted aryl with 6 to 12 carbon atoms.

[0063] According to one embodiment of the present disclosure, wherein one of R x Cyano is and at least one other of R x is selected from the group consisting of: Deuterium, Methyl, deuterated Methyl, Isopropyl, deuterated Isopropyl, Cyclohexyl, deuterated Cyclohexyl, Phenyl, deuterated Phenyl, Methylphenyl and deuterated Methylphenyl.

[0064] According to one embodiment of the present disclosure, wherein at least one of X5 to X8 CR x and R x It's cyano.

[0065] According to one embodiment of the present disclosure, wherein at least one of X7 and X8 CR x is and R x It's cyano.

[0066] According to one embodiment of the present disclosure, wherein X7 CR x is and R x It's cyano.

[0067] According to one embodiment of the present disclosure, wherein X8 CR x and R x It's cyano.

[0068] According to one embodiment of the present disclosure, wherein U1 to U4 are selected from CR in each occurrence, either the same or different. u , one of R u is selected from substituted or unsubstituted alkyl with 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 20 ring carbon atoms or a combination thereof, and the total number of carbon atoms in R u at least 4.

[0069] According to one embodiment of the present disclosure, wherein U1 to U4 are selected from N or CR, either the same or different, in each occurrence u , one of U1 to U4 CR u is and R usubstituted or unsubstituted alkyl with 1 to 12 carbon atoms, substituted or unsubstituted cycloalkyl with 4 to 10 ring carbon atoms or a combination thereof, and the total number of carbon atoms in R u at least 4.

[0070] According to one embodiment of the present disclosure, wherein at least one of R u The selected compound is a substituted or unsubstituted alkyl with 4 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl with 4 to 20 carbon atoms, or a combination thereof.

[0071] According to one embodiment of the present disclosure, one of R" is selected from the group consisting of the following substituents, which are either substituted or unsubstituted: and combinations thereof, optionally the above groups being partially or completely deuterated; where “*” represents a position in which the substituent is bonded to carbon.

[0072] According to one embodiment of the present disclosure, wherein at least one of R u The selected compound is a substituted or unsubstituted alkyl with 4 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl with 4 to 6 carbon atoms, or a combination thereof.

[0073] According to one embodiment of the present disclosure, wherein U2 or U3 CR u is and R u selected from substituted or unsubstituted alkyl with 4 to 20 carbon atoms, substituted or unsubstituted cycloalkyl with 4 to 20 carbon atoms or a combination thereof.

[0074] According to one embodiment of the present disclosure, wherein U2 or U3 CR u is, R uThe compound selected from substituted or unsubstituted alkyl with 4 to 6 carbon atoms, substituted or unsubstituted cycloalkyl with 4 to 6 carbon atoms, or a combination thereof, may be the same or different in each occurrence.

[0075] According to one embodiment of the present disclosure, wherein U1 and U4 CR u are and R u selected from hydrogen, deuterium, methyl, or deuterated methyl.

[0076] According to one embodiment of the present disclosure, wherein W1 to W4 are selected from CR in each occurrence, either the same or different. w , Y1 to Y4 are selected the same or differently from CR in each occurrence y and R w and R yThe elements selected for each occurrence are the same or different from the group consisting of: hydrogen, deuterium, substituted or unsubstituted alkyl with 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 20 ring carbon atoms, substituted or unsubstituted aryl with 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl with 3 to 30 carbon atoms and combinations thereof.

[0077] According to one embodiment of the present disclosure, wherein R w and R y The elements selected for each occurrence are the same or different from the group consisting of: hydrogen, deuterium, substituted or unsubstituted alkyl with 1 to 10 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 10 ring carbon atoms, substituted or unsubstituted aryl with 6 to 10 carbon atoms and combinations thereof.

[0078] According to one embodiment of the present disclosure, wherein R w and R y The elements, whether the same or different, are selected from the group consisting of: hydrogen, deuterium, substituted or unsubstituted alkyl with 1 to 10 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 10 ring carbon atoms and combinations thereof.

[0079] According to one embodiment of the present disclosure, wherein W1 to W4 are selected from CR in each occurrence, either the same or different. w and at least one R wselected is from the group consisting of: deuterium, substituted or unsubstituted alkyl with 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 20 ring carbon atoms, substituted or unsubstituted aryl with 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl with 3 to 30 carbon atoms and combinations thereof; and / or Y1 to Y4, in each occurrence the same or different, are selected from CR y and at least one R y selected is from the group consisting of: deuterium, substituted or unsubstituted alkyl with 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 20 ring carbon atoms, substituted or unsubstituted aryl with 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl with 3 to 30 carbon atoms and their combinations.

[0080] According to one embodiment of the present disclosure, wherein L a The selection is the same or different for each occurrence, drawn from the group consisting of L a1 to L a206 , where the specific structures of L a1 to L a206 are specified in claim 15.

[0081] According to one embodiment of the present disclosure, wherein L b The selection is the same or different for each occurrence, drawn from the group consisting of L b1 to L b872 , L b909 to L b924 and L b949 to L b972 , where the specific structures of L b1 to L b872 , L b909 to L b924 and L b949 to L b972 as specified in claim 16.

[0082] According to one embodiment of the present disclosure, wherein the metal complex has a structure Ir(L a )2L b exhibits, with the two L a are equal; La selected from the group consisting of L a1 to L a206 , where the specific structures of L a1 to L a206 are specified in claim 15; and L b selected from the group consisting of L b1 to L b872 , L b909 to L b924 and L b949 to L b972 , where the specific structures of L b1 L b872 , L b909 to L b924 and L b949 up to L b972 as specified in claim 16.

[0083] According to an embodiment of the present disclosure, wherein the metal complex is selected from the group consisting of metal complex 1 to metal complex 448, wherein the specific structures of metal complex 1 to metal complex 448 are specified in claim 17.

[0084] According to one embodiment of the present disclosure, an electroluminescent device is further provided. The electroluminescent device comprises an anode, a cathode, and an organic layer arranged between the anode and the cathode, wherein at least one layer of the organic layer contains the metal complex of one of the preceding embodiments.

[0085] According to one embodiment of the present disclosure, wherein in the electroluminescent device the organic layer containing the metal complex is a light-emitting layer.

[0086] According to one embodiment of the present disclosure, wherein the light-emitting layer in the electroluminescent device emits green light.

[0087] According to an embodiment of the present disclosure, wherein the light-emitting layer in the electroluminescent device further comprises at least one first host compound.

[0088] According to an embodiment of the present disclosure, wherein the light-emitting layer in the electroluminescent device further comprises at least one first host compound and at least one second host compound.

[0089] According to an embodiment of the present disclosure, wherein at least one of the host compounds in the electroluminescence device comprises at least one chemical group selected from the group consisting of: benzene, pyridine, pyrimidine, triazine, carbazole, azacarbazole, indolocarbazole, dibenzothiophene, aza-dibenzothiophene, dibenzofuran, azadibenzofuran, dibenzoselenophene, triphenylene, azatriphenylene, fluorene, silafluorene, naphthalene, quinoline, isoquinoline, quinazoline, quinoxaline, phenanthrene, azaphenanthrene and combinations thereof.

[0090] According to one embodiment of the present disclosure, wherein the first host compound has a structure represented by formula 3: wherein L x, the same or different in each occurrence, is selected from a single bond, substituted or unsubstituted alkylene with 1 to 20 carbon atoms, substituted or unsubstituted cycloalkylene with 3 to 20 carbon atoms, substituted or unsubstituted arylene with 6 to 20 carbon atoms, substituted or unsubstituted heteroarylene with 3 to 20 carbon atoms or a combination thereof; V, the same or different in each occurrence, is selected from C, CR v or N, and at least one of VC is and with L x is connected; T, whether the same or different in each occurrence, is selected from C, CRt or N, and at least one of TC is and with L x is connected; R v and R t, the same or different in each occurrence, are selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl with 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl with 1 to 20 carbon atoms, a substituted or unsubstituted heterocyclic group with 3 to 20 ring atoms, substituted or unsubstituted arylalkyl with 7 to 30 carbon atoms, substituted or unsubstituted alkoxy with 1 to 20 carbon atoms, substituted or unsubstituted aryloxy with 6 to 30 carbon atoms, substituted or unsubstituted alkenyl with 2 to 20 carbon atoms, substituted or unsubstituted aryl with 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl with 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl with 3 to 20 carbon atoms,substituted or unsubstituted arylsilyl with 6 to 20 carbon atoms, substituted or unsubstituted amino with 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a sulfanyl group, a sulfinyl group, a sulfonyl group, a phosphino group and combinations thereof; Ar1, whether identical or different in each occurrence, is selected from substituted or unsubstituted aryl with 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl with 3 to 30 carbon atoms, or a combination thereof; and neighboring substituents R v and Rt may be connected to each other to form a ring.

[0091] In this embodiment, the expression that “adjacent substituents R” is intended to vand Rt may be linked to form a ring,” means that one or more groups of adjacent substituents, such as two substituents R v , two substituents Rt and two substituents R v and R t They can be connected to form a ring. Of course, it is also possible that none of these substituents are connected to form a ring.

[0092] According to one embodiment of the present disclosure, the second host compound has a structure represented by one of formulas 3-a to 3-j: wherein L x, identical or different in each occurrence, is selected from a single bond, substituted or unsubstituted alkylene with 1 to 20 carbon atoms, substituted or unsubstituted cycloalkylene with 3 to 20 carbon atoms, substituted or unsubstituted arylene with 6 to 20 carbon atoms, substituted or unsubstituted heteroarylene with 3 to 20 carbon atoms or a combination thereof; V, identical or different in each occurrence, is selected from CR v or N; T, identical or different in each occurrence, is selected from CRt or N; R v and R t, identical or different in each occurrence, are selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl with 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl with 1 to 20 carbon atoms, a substituted or unsubstituted heterocyclic group with 3 to 20 ring atoms, substituted or unsubstituted arylalkyl with 7 to 30 carbon atoms, substituted or unsubstituted alkoxy with 1 to 20 carbon atoms, substituted or unsubstituted aryloxy with 6 to 30 carbon atoms, substituted or unsubstituted alkenyl with 2 to 20 carbon atoms, substituted or unsubstituted aryl with 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl with 3 to 30 carbon atoms,substituted or unsubstituted alkylsilyl with 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl with 6 to 20 carbon atoms, substituted or unsubstituted amino with 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a sulfanyl group, a sulfinyl group, a sulfonyl group, a phosphino group and combinations thereof; Ar1, identical or different in each occurrence, is selected from substituted or unsubstituted aryl with 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl with 3 to 30 carbon atoms, or a combination thereof; and neighboring substituents R v and Rt may be connected to each other to form a ring.

[0093] According to an embodiment of the present disclosure, wherein the metal complex in the electroluminescent device is doped into the first host compound and the second host compound, and the weight of the metal complex constitutes 1 to 30% of the total weight of the light-emitting layer.

[0094] According to an embodiment of the present disclosure, wherein the metal complex in the electroluminescent device is doped into the first host compound and the second host compound, and the weight of the metal complex constitutes 3 to 13% of the total weight of the light-emitting layer.

[0095] According to another embodiment of the present disclosure, wherein a compound composition is further provided comprising a metal complex whose specific structure is shown as in one of the preceding embodiments. Combination with other materials

[0096] The materials described in the present disclosure for a specific layer in an organic light-emitting device can be used in combination with various other materials present in the device. Combinations of these materials are described in US 2016 / 0359122 A1, paragraphs 132 to 161. The materials described or mentioned in the disclosure are non-limiting examples of materials that may be advantageous in combination with the compounds disclosed herein, and a person skilled in the art can readily consult the literature to identify other materials that may be advantageous in combination.

[0097] The materials described herein, which are advantageous for a particular layer in an organic light-emitting device, can be used in combination with a variety of other materials present in the device. For example, the compounds disclosed herein can be used in combination with a variety of host layers, transport layers, barrier layers, injection layers, electrodes, and other layers that may be present. The combination of these materials is described in paragraphs 0080-0101 of US 2015 / 0349273A1. The materials described or mentioned in the disclosure are non-limiting examples of materials that may be useful in combination with the compounds disclosed herein, and a person skilled in the art may readily consult the literature to identify other materials that may be useful in combination.

[0098] In the embodiments of the material synthesis, all reactions were carried out under nitrogen protection unless otherwise specified. All reaction solvents were anhydrous and were obtained from commercial sources. Synthetic products were structurally confirmed and their properties were tested using one or more conventional state-of-the-art instruments (including, but not limited to, a nuclear magnetic resonance instrument manufactured by Bruker, a liquid chromatograph manufactured by Shimadzu, a liquid chromatograph-mass spectrometer manufactured by Shimadzu, a gas chromatograph-mass spectrometer manufactured by Shimadzu, differential scanning calorimeters manufactured by Shimadzu, a fluorescence spectrophotometer manufactured by Shanghai Lengguang Tech., an electrochemical workstation manufactured by Wuhan Corrtest, and a sublimation apparatus manufactured by Anhui Beq, etc.).The device's properties were also tested using conventional prior art equipment (including, but not limited to, an evaporator manufactured by ANGSTROM ENGINEERING, an optical testing system manufactured by SUZHOU FATAR, a lifetime testing system manufactured by SUZHOU FATAR, and an ellipsometer manufactured by BEI-JING ELLITOP, etc.) using methods well known to those skilled in the art. Since the aforementioned uses of the equipment, test methods, and other related content are known to those skilled in the art, the inherent data of the sample can be obtained with certainty and without influence, so the aforementioned related content is not described further in this patent. Example of a material synthesis

[0099] The method of preparation of a compound in the present disclosure is not limited here. Typically, the following compounds are used as examples without limitation, and the synthetic routes and preparation methods are described below. Synthesis example 1: Synthesis of metal complex 13

[0100] Intermediate 1 (1.6 g, 4.6 mmol), iridium complex 1 (3.18 g, 3.8 mmol), 2-ethoxyethanol (30 mL), and DMF (30 mL) were added successively to a dry 250 mL round-bottom flask and heated to 90 °C for 144 hours under nitrogen protection. The reaction was cooled, filtered through Celite, and washed twice separately with methanol and n-hexane. The yellow solids on the Celite were dissolved with dichloromethane. The organic phases were collected, concentrated under reduced pressure, and purified by column chromatography to obtain metal complex 13 as a yellow solid (0.82 g in 22.3% yield). The product was confirmed as the target product with a molecular weight of 958.3. Synthesis example 2: Synthesis of metal complex 7

[0101] Intermediate 2 (1.0 g, 2.9 mmol), iridium complex 1 (2.2 g, 2.6 mmol), 2-ethoxyethanol (40 mL), and DMF (40 mL) were added successively to a dry 250 mL round-bottom flask and heated to 100 °C for 120 hours under nitrogen protection. The reaction was cooled, filtered through Celite, and washed twice separately with methanol and n-hexane. The yellow solids on the Celite were dissolved with dichloromethane. The organic phases were collected, concentrated under reduced pressure, and purified by column chromatography to obtain metal complex 7 as a yellow solid (0.45 g in 18.1% yield). The product was confirmed as the target product with a molecular weight of 958.3. Synthesis example 3: Synthesis of metal complex 17

[0102] Intermediate 3 (1.2 g, 4.5 mmol), iridium complex 1 (2.5 g, 3.0 mmol), 2-ethoxyethanol (30 mL), and DMF (30 mL) were added successively to a dry 250 mL round-bottom flask and heated to 90 °C for 144 hours under nitrogen protection. The reaction was cooled, filtered through Celite, and washed twice separately with methanol and n-hexane. The yellow solids on the Celite were dissolved with dichloromethane. The organic phases were collected, concentrated under reduced pressure, and purified by column chromatography to obtain metal complex 17 as a yellow solid (0.73 g in 25.3% yield). The product was confirmed as the target product with a molecular weight of 963.3. Synthesis example 4: Synthesis of metal complex 163

[0103] Intermediate 1 (1.3 g, 3.7 mmol), iridium complex 2 (2.2 g, 2.6 mmol), 2-ethoxyethanol (30 mL), and DMF (30 mL) were added successively to a dry 250 mL round-bottom flask and heated to 90 °C for 144 hours under nitrogen protection. The reaction was cooled, filtered through Celite, and washed twice separately with methanol and n-hexane. The yellow solids on the Celite were dissolved with dichloromethane. The organic phases were collected, concentrated under reduced pressure, and purified by column chromatography to obtain metal complex 163 as a yellow solid (0.78 g in 30.4% yield). The product was confirmed as the target product with a molecular weight of 986.3. Synthesis example 5: Synthesis of metal complex 43

[0104] Intermediate 1 (1.5 g, 4.9 mmol), iridium complex 3 (3.0 g, 3.6 mmol), 2-ethoxyethanol (30 mL), and DMF (30 mL) were added successively to a dry 250 mL round-bottom flask and heated to 95 °C under nitrogen for 144 hours. The reaction was cooled, filtered through Celite, and washed twice separately with methanol and n-hexane. The yellow solids on the Celite were dissolved with dichloromethane. The organic phases were collected, concentrated under reduced pressure, and purified by column chromatography to obtain metal complex 43 as a yellow solid (1.23 g in 35.4% yield). The product structure was confirmed as the target product with a molecular weight of 964.4.

[0105] Experts will understand that the above manufacturing processes are only examples. Other compound structures of the present disclosure can be obtained by modifying the manufacturing processes. Device example 1

[0106] First, a glass substrate with an 80 nm thick indium tin oxide (ITO) anode was purified and then treated with oxygen plasma and UV ozone. After treatment, the substrate was dried in a glovebox to remove moisture. The substrate was then mounted on a substrate holder and placed in a vacuum chamber. The organic layers listed below were sequentially deposited by thermal vacuum evaporation on the ITO anode at a rate of 0.2 to 2 angstroms per second and a vacuum level of approximately 10⁻⁶. -8The compound HI was used as a hole injection layer (HIL). The compound HT was used as a hole transport layer (HTL). The compound H1 was used as an electron blocking layer (EBL). The metal complex 13 of the present disclosure was doped in compound H1 and compound H2, and the resulting mixture was deposited for use as an emitting layer (EML). On the EML, compound H2 was used as a hole blocking layer (HBL). On the HBL, compound ET and 8-hydroxyquinolinolato-lithium (Liq) were jointly deposited to serve as an electron transport layer (ETL). Finally, 8-hydroxyquinolinolato-lithium (Liq) was deposited as an electron injection layer with a thickness of 1 nm, and Al was deposited as a cathode with a thickness of 120 nm.The device was transferred back into the glovebox and encapsulated with a glass lid and a moisture absorber to complete the device. Device example 3

[0107] The implementation method in device example 3 was the same as in device example 1, except that in the emitting layer (EML) the metal complex 13 of the present disclosure was replaced by the metal complex 17. Device comparison example 1

[0108] The implementation method in Device Comparison Example 1 was the same as in Device Example 1, except that in the emitting layer (EML) the metal complex 13 of the present disclosure was replaced by the compound GD1. Device comparison example 2

[0109] The implementation method in device comparison example 2 was the same as in device example 1, except that in the emitting layer (EML) the metal complex 13 of the present disclosure was replaced by the compound GD2.

[0110] Detailed structures and thicknesses of the device layers are given in the following table. A layer using more than one material is obtained by doping different compounds in their weight ratio, as shown. Table 1: Device structures in Examples 1 and 3 and Comparative Examples 1 and 2 Device no. HIL HTL EBL EML HBL ETL Example 1 HI connection (100 Å) HT connection (350 Å) Connection H1 (50 Å) Compound H1 : Compound H2 : Metal complex 13 (46:46:8) (400 Å) Compound H2 (50 Å) Compound ET:Liq (40:60) (350 Å) Example 3 HI connection (100 Å) HT connection (350 Å) Connection H1 (50 Å) Compound H1 : Compound H2 : Metal complex 17 (46:46:8) (400 Å) Compound H2 (50 Å) Compound ET:Liq (40:60) (350 Å) Comparative example 1 HI connection (100 Å) HT connection (350 Å) Connection H1 (50 Å) Connection H1 : Connection H2 : Connection GD1 (46:46:8) (400 Å) Compound H2 (50 Å) Compound ET:Liq (40:60) (350 Å) Comparative example 2 HI connection (100 Å) HT connection (350 Å) Connection H1 (50 Å) Connection H1 : Connection H2 : Connection GD2 (46:46:8) (400 Å) Compound H2 (50 Å) Compound ET:Liq (40:60) (350 Å)

[0111] The structures of the materials used in the devices are as follows:

[0112] The current-voltage luminance (IVL) characteristics of the devices were measured. The CIE data, the maximum emission wavelengths λ maxand the full width at half maximum (FWHM) of the devices was set to 1000 cd / m² 2 The vaporization temperature (Sub T) of a material is a temperature measured when the metal complex undergoes thermal vacuum vaporization at a rate of 0.2 angstroms per second and a vacuum of approximately 10 degrees. -8 Torr is subjected to this. The lifetime data (LT97) were obtained at a constant current of 80 mA / cm². 2 Tested. The data were recorded and are shown in Table 2. Table 2: Device data of examples 1 and 3 and comparison examples 1 and 2 Device no. Sub T (°C) CIE (x, y) l max (nm) FWHM (nm) LT 97 (h) Example 1 258 (0,349, 0,630) 533 37,6 17,20 Example 3 252 (0,345, 0,633) 532 36,3 21,40 Comparative example 1 291 (0,335, 0,638) 528 40,9 11,35 Comparative example 2 287 (0,346, 0,631) 531 40,6 14,90

[0113] As can be seen from the data in Table 2, the FWHM of Example 1 is 3.3 nm lower than that of Comparative Example 1 and 3.0 nm lower than that of Comparative Example 2. At the same time, the evaporation temperature of Example 1 is almost 33 °C lower than that of Comparative Example 1 and almost 29 °C lower than that of Comparative Example 2. The lower evaporation temperature contributes to the stability of the complex of the present disclosure in an evaporation process, and a low evaporation temperature is advantageous for the industrial application of materials and can reduce energy consumption. In addition, the lifetime of Example 1 is 51.5% longer than that of Comparative Example 1 and 15.4% longer than that of Comparative Example 2. Similarly, the FWHM of Example 3, in which the metal complex 17 is used in the device, is 4.6 nm and 15.4% longer, respectively.Example 3 has a 4.3 nm smaller diameter than comparison examples 1 and 2, an evaporation temperature almost 40 °C and 37 °C lower, and a lifetime 88.5% and 43.6% longer, respectively. This means Example 3 has a lower FWHM, a lower evaporation temperature, and a significantly improved device lifetime. The overall performance of the device is considerably improved.

[0114] The metal complex 13 used in Example 1 contains the same ligand L b like the metal complex GD1 used in comparative example 1 and the metal complex GD2 used in comparative example 2, but with the ligand L a has different substituents. In comparison to the examples without substitution or with only one methyl substitution, example 1, in which the ligand L aWhen used with a specific substitution, a lower FWHM, a lower evaporation temperature, and a longer device lifetime are observed. The metal complex 17 used in Example 3 also contains a deuterium substitution at ligand L. b , which further improves the performance of the device and increases the overall performance of the device. Device example 2

[0115] The implementation method in device example 2 was the same as in device example 1, except that in the emitting layer (EML) the metal complex 13 of the present disclosure was replaced by the metal complex 7. Device comparison example 3

[0116] The implementation method in device comparison example 3 was the same as in device example 1, except that in the emitting layer (EML) the metal complex 13 of the present disclosure was replaced by the compound GD3.

[0117] Detailed structures and thicknesses of the device layers are given in the following table. A layer using more than one material is obtained by doping different compounds in their weight ratio, as shown. Table 3 Device structures in Example 3 and Comparative Example 3 Device no. HIL HTL EBL EML HBL ETL Example 2 HI connection (100 Å) HT connection (350 Å) Connection H1 (50 Å) Compound H1 : Compound H2 : Metal complex 7 (46:46:8) (400 Å) Compound H2 (50 Å) Compound ET:Liq (40:60) (350 Å) Comparative example 3 HI connection (100 Å) HT connection (350 Å) Connection H1 (50 Å) Connection H1 : Connection H2 : Connection GD3 (46:46:8) (400 Å) Compound H2 (50 Å) Compound ET:Liq (40:60) (350 Å)

[0118] The structures of the new materials used in the devices are as follows:

[0119] The IVL properties of the devices were measured. The CIE data, the maximum emission wavelengths λ max and the full width at half maximum (FWHM) of the devices was set to 1000 cd / m² 2The vaporization temperature (Sub T) of a material is the temperature tested when the metal complex undergoes thermal vacuum vaporization at a rate of 0.2 angstroms per second and a vacuum of approximately 10 degrees. -8 Torr is subjected to this. The lifetime data (LT97) were obtained at a constant current of 80 mA / cm². 2 Tested. The data were recorded and are shown in Table 4. Table 4 Device data of Example 2 and Comparative Example 3 Device no. Sub T (°C) CIE (x, y) l max (nm) FWHM (nm) LT 97 (h) Example 2 270 (0,354, 0,626) 534 43,7 17,70 Comparative example 3 296 (0,352, 0,627) 534 46,0 15,20

[0120] As can be seen from the data in Table 4, the FWHM of device Example 2 is 2.3 nm lower than that of device Comparison Example 3, and the evaporation temperature of device Example 2 is almost 26 °C lower than that of Comparison Example 3. Furthermore, the lifetime of Example 2 is 16.4% longer than that of Comparison Example 3. The metal complex 7 used in Example 2 contains the same ligand L. b such as the metal complex GD3 used in comparative example 3, the ligand L a However, it has different substituents. Example 2 has a lower FWHM, a lower evaporation temperature, and a longer lifetime of the device than comparative example 3, which in turn proves the excellent effects of the present disclosure. Sublimation data

[0121] The metal complexes and reference compounds in the present disclosure were sublimated using a sublimation apparatus with model number BOF-A1-3-60, manufactured by Anhui BEQ Equipment Technology Co. Metal complex 13, metal complex 17, metal complex 7, and the reference complexes GD1, GD2, and GD3 in the present disclosure were separately introduced into sublimation tubes of the sublimation apparatus and heated to 300 °C to 370 °C for stable sublimation, yielding the metal complexes. The degree of vacuum in the sublimation tubes was reduced to less than 9.9 × 10⁻⁶ using a molecular pump. -4 Pa was reduced. The data on the sublimation yield of these materials were recorded and are shown in Table 5. The sublimation yield is the ratio of a mass after sublimation to a mass before sublimation. Table 5: Sublimation data Connection number Sublimation yield (%) Metal complex 13 85,3 Metal complex 17 88,8 Metal complex 7 71,1 GD1 connection 32,5 GD2 connection 58,9 GD3 connection 48,8

[0122] As can be seen from the data in Table 5, metal complex 13 and metal complex 17 exhibit certain substitutions on ligand L. a In the present disclosure, an excellent sublimation performance is observed, with the sublimation yields of metal complex 13 and metal complex 17 reaching 85.3% and 88.8%, respectively, which is almost 1.6 and 1.7 times higher than the sublimation yield (32.8%) of the reference compound GD1. Similarly, the sublimation yields of metal complex 13 and metal complex 17 are 44.8% and 50.7% higher, respectively, than the sublimation yield (58.9%) of the reference compound GD2. Furthermore, the sublimation yield of metal complex 7 reaches 71.1%, which is 45.6% higher than the sublimation yield (48.8%) of the reference compound GD3. The results show that the metal complex with a specific (cyclo)alkyl substitution, which is incorporated into the structure of ligand L in the present disclosure, exhibits excellent sublimation performance. aThe introduced substitution yield is higher than that of the metal complex without it. This significant increase in substitution yield is unexpected and of great importance for the mass production of metal complexes in industry. Device example 4

[0123] The implementation method in device example 4 was the same as in device example 1, except that in the emitting layer (EML) compound H2 was replaced by compound H3 and the ratio of compound H1, compound H3 and metal complex 13 was 63:31:6. Device comparison example 4

[0124] The implementation method in Device Comparison Example 4 was the same as in Device Example 4, except that in the emitting layer (EML) the metal complex 13 of the present disclosure was replaced by the compound GD2. Device comparison example 5

[0125] The implementation method in device comparison example 5 was the same as in device example 4, except that in the emitting layer (EML) the metal complex 13 of the present disclosure was replaced by the compound GD4. Device comparison example 6

[0126] The implementation method in device comparison example 6 was the same as in device example 4, except that in the emitting layer (EML) the metal complex 13 of the present disclosure was replaced by the compound GD5. Device comparison example 7

[0127] The implementation method in device comparison example 7 was the same as in device example 4, except that in the emitting layer (EML) the metal complex 13 of the present disclosure was replaced by the compound GD6.

[0128] Detailed structures and thicknesses of the device layers are given in Table 6. A layer using more than one material is obtained by doping different compounds in their weight ratio, as shown. Table 6 Device structures in Example 4 and comparative examples 4 to 7 Device no. HIL HTL EBL EML HBL ETL Example 4 HI connection (100 Å) HT connection (350 Å) Connection H1 (50 Å) Compound H1 : Compound H3 : Metal complex 13 (63:31:6) (400 Å) Compound H2 (50 Å) Compound ET:Liq (40:60) (350 Å) Comparative example 4 HI connection (100 Å) HT connection (350 Å) Connection H1 (50 Å) Connection H1 : Connection H3 : GD2 (63:31:6) (400 Å) Compound H2 (50 Å) Compound ET:Liq (40:60) (350 Å) Comparative example 5 HI connection (100 Å) HT connection (350 Å) Connection H1 (50 Å) Connection H1 : Connection H3 : GD4 (63:31:6) (400 Å) Compound H2 (50 Å) Compound ET:Liq (40:60) (350 Å) Comparative example 6 HI connection (100 Å) HT connection (350 Å) Connection H1 (50 Å) Connection H1 : Connection H3 : GD5 (63:31:6) (400 Å) Compound H2 (50 Å) Compound ET:Liq (40:60) (350 Å) Comparative example 7 HI connection (100 Å) HT connection (350 Å) Connection H1 (50 Å) Connection H1 : Connection H3 : GD6 (63:31:6) (400 Å) Compound H2 (50 Å) Compound ET:Liq (40:60) (350 Å)

[0129] The structures of the new materials used in the devices are as follows:

[0130] The IVL properties of the devices were measured. The CIE data, the maximum emission wavelengths λ max and the full width at half maximum (FWHM) of the devices was set to 1000 cd / m² 2measured. The lifetime (LT95) is the time it takes to maintain an initial luminance of 10000 cd / m². 2 required to decrease to 95% of the original luminance. The data were recorded and are shown in Table 7. Table 7 Device data for Example 4 and comparison examples 4 to 7 Device number CIE (x, y) l max (nm) FWHM (nm) LT95 (h) Example 4 (0,346, 0,632) 531 37,5 1159 Comparative example 4 (0,342, 0,634) 529 37,9 829 Comparative example 5 (0,353, 0,623) 531 58,9 1001 Comparative example 6 (0,352, 0,623 528 60,3 910 Comparative example 7 (0,355, 0,621) 531 59,5 940

[0131] As can be seen from the data in Table 7, the lifetime of example 4 reaches 10000 cd / m². 2 1159 hours, which represents a significant improvement compared to examples 4 to 7. The lifetime of example 4 is 39.8% longer than that of example 4 without special substituents on ligand L. a , almost 15.8% and 23.3% higher respectively than those of comparison examples 5 and 7 without cyanosubstitution at ligand L b and 27.4% longer than that of comparison example 6 without special substituents on the ligands L a and L bFurthermore, the FWHM of Example 4 is only 37.5 nm and is much lower than about 59 nm of the comparison examples 5 and 7, which is very rare for green phosphorescent devices.

[0132] If there is no cyanosubstituent on ligand L b The lifetime of comparison example 5 with a specific substitution at ligand L is given. a only 10% longer than the lifetime of comparison example 6 without a specific substitution at ligand L a , whereas, if there is a cyano substituent on the ligand L b There is a lifetime of example 4 with a specific substitution at ligand L. a 39.8% longer than that of comparison example 4 without a specific substitution at ligand L a Similarly, with the same ligand L a the lifetime of example 4 with a cyanosubstitution at ligand L b15.8% longer than that of comparison example 5 without cyanosubstitution at ligand L b , while the lifetime of comparison example 7 with a fluorine substitution at ligand L b is somewhat shorter than that of comparative example 5. All the above results show that the metal complex containing the ligand L a with the specific substitution and the ligands L b with the cyanosubstitution contained in the present disclosure, excellent device performance, in particular a greatly improved device lifetime, can be achieved.

[0133] In summary, it can be stated that the metal complexes of the present disclosure, the ligands L a and L bWith certain substitutions, these metal complexes can be used as light-emitting materials in light-emitting layers of electroluminescent devices. In combination with host materials of different structures, the metal complexes can all achieve excellent performance. The metal complexes of the present disclosure containing the ligands L a and L b With certain substitutions, the FWHMs of the corresponding devices can be maintained at a high level and the device lifetime can be significantly improved. Furthermore, the metal complexes of the present disclosure can also greatly improve the sublimation yield and the evaporation temperature, exhibiting enormous advantages and a broad perspective in industrial applications.

Claims

[1] Metal complex with a general formula Ir(L a ) m (L6) n , where L a and L b a first ligand and a second ligand are coordinated to the metal Ir; m is 1 or 2, n is 1 or 2 and m+n corresponds to the oxidation state of Ir; if m is 2, two L a are the same or different; if n is 2, two L b are the same or different; L a , identically or differently at each occurrence, has a structure represented by the formula 1A, and L b , identical or different at each occurrence, has a structure represented by the formula 1Ba: where Z is selected from the group consisting of O, S and Se; X3 to X8, the same or different at each occurrence, are selected from CR x ; Y1 to Y4, the same or different at each occurrence, are selected from CR y or N; U1 to U4, the same or different at each occurrence, are selected from CR u or N; W1 to W4, the same or different at each occurrence, are selected from CR w or N; R x , R y , R u and R w, which may be the same or different at each occurrence, are selected from the group consisting of: hydrogen, deuterium, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted arylalkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, a cyano group, an isocyano group, and combinations thereof; one from U1 to U4 from CR u are selected and R usubstituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms or a combination thereof and the total number of carbon atoms in R u is at least 4; at least one of R x Cyano is; and neighboring substituents R x , R y , R u , R w may optionally be connected to form a ring. [2] The metal complex according to claim 1, wherein the metal complex has a structure represented by formula 2: where m is selected from 2; if m = 2, two L a are the same or different; Z is selected from the group consisting of O, S and Se; X3 to X8, the same or different at each occurrence, are selected from CR x ; Y1 to Y4, the same or different at each occurrence, are selected from CR y ; U1 to U4, the same or different at each occurrence, are selected from CR L ,; W1 to W4, the same or different at each occurrence, are selected from CR w ; R x , R y , R u and R w, which may be the same or different at each occurrence, are selected from the group consisting of: hydrogen, deuterium, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted arylalkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, a cyano group, an isocyano group, and combinations thereof; one from U1 to U4 from CR L , are selected and R L, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms or a combination thereof and the total number of carbon atoms in all R u is at least 4; at least one of R x Cyano is; and neighboring substituents R x , R y , R u , R w may optionally be connected to form a ring. [3] Metal complex according to one of claims 1 or 2, wherein Z is selected from O or S; preferably Z is 0. [4] A metal complex according to any one of claims 1 to 3, wherein one of R x Cyano is; and at least one other of R xis selected from the group consisting of: deuterium, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted arylalkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, a cyano group, an isocyano group, and combinations thereof; wherein preferably one of R x Cyano is; and at least one other of R xis selected from the group consisting of: deuterium, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, a cyano group, and combinations thereof; more preferably one of R x Cyano is; and at least one other of R xis selected from the group consisting of: deuterium, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, and combinations thereof. [5] A metal complex according to any one of claims 1 to 4, wherein one of R x Cyano is and at least one other of R x is selected from the group consisting of: substituted or unsubstituted aryl having 6 to 15 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 15 carbon atoms, and combinations thereof. [6] Metal complex according to any one of claims 1 to 4, wherein R x Cyano is and at least one other of R xis selected from the group consisting of: deuterium, methyl, deuterated methyl, isopropyl, deuterated isopropyl, cyclohexyl, deuterated cyclohexyl, phenyl, deuterated phenyl, methylphenyl and deuterated methylphenyl. [7] A metal complex according to any one of claims 1 to 6, wherein at least one of X5 to X8 is CR x and R x Cyano is; preferably X7 CR v is and R x Cyano is; or X8 CR x is and R x Cyano is. [8] Metal complex according to one of claims 1 to 7, wherein U1 to U4, identical or different at each occurrence, are selected from CR'', one of R u is selected from substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, or a combination thereof, and the total number of carbon atoms in R u is at least 4. [9] Metal complex according to one of claims 1 to 7, wherein U1 to U4, identical or different at each occurrence, are selected from N or CR u , one from U1 to U4 CR u and R'' is substituted or unsubstituted alkyl having 1 to 12 carbon atoms, substituted or unsubstituted cycloalkyl having 4 to 10 ring carbon atoms, or a combination thereof, and the total number of carbon atoms in R u is at least 4. [10] A metal complex according to any one of claims 1 to 9, wherein one of R u is selected from substituted or unsubstituted alkyl having 4 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 4 to 20 carbon atoms, or a combination thereof; wherein preferably one of R uis selected from the group consisting of the following substituents, which are either substituted or unsubstituted:and combinations thereof, optionally the above groups are partially or fully deuterated; where “*” represents a position where the substituent is bonded to carbon [11] Metal complex according to any one of claims 1 to 10, wherein U2 or U3 is CR u is and R u is selected from substituted or unsubstituted alkyl having 4 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 4 to 20 carbon atoms, or a combination thereof; preferably R u is selected from substituted or unsubstituted alkyl having 4 to 6 carbon atoms, substituted or unsubstituted cycloalkyl having 4 to 6 carbon atoms, or a combination thereof. [12] Metal complex according to claim 11, wherein U1 and U4 are CR u are and R uis selected from hydrogen, deuterium, methyl or deuterated methyl. [13] Metal complex according to one of claims 1 to 12, wherein W1 to W4, identical or different at each occurrence, are selected from CR w , Y1 to Y4, the same or different at each occurrence, are selected from CR y and R w and R y , which may be the same or different at each occurrence, are selected from the group consisting of: hydrogen, deuterium, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, and combinations thereof; preferably, R w and R y, the same or different at each occurrence, are selected from the group consisting of: hydrogen, deuterium, substituted or unsubstituted alkyl having 1 to 10 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 10 ring carbon atoms, substituted or unsubstituted aryl having 6 to 10 carbon atoms, and combinations thereof; even more preferred R w and R y , identical or different at each occurrence, are selected from the group consisting of: hydrogen, deuterium, substituted or unsubstituted alkyl having 1 to 10 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 10 ring carbon atoms, and combinations thereof. [14] Metal complex according to one of claims 1 to 12, wherein W1 to W4 are selected, identically or differently, at each occurrence from CR w and at least one R wis selected from the group consisting of: deuterium, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, and combinations thereof; and / or Y1 to Y4 are selected, identically or differently at each occurrence, from CR v and at least one R y is selected from the group consisting of: deuterium, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, and combinations thereof. [15] Metal complex according to claim 1, wherein L a, identical or different at each occurrence, is selected from the group consisting of the following: [16] Metal complex according to claim 15, wherein L b , identical or different at each occurrence, is selected from the group consisting of the following: [17] A metal complex according to claim 16, wherein the metal complex has a structure Ir(L a )2L b where the two L a are equal; L a is selected from the group consisting of L a1 to L a206 and L b is selected from the group consisting of L b1 to L b872 , L b909 to L b924 and L b949 to L b972 ; wherein the metal complex is preferably selected from the group consisting of metal complex 1 to metal complex 448, wherein metal complex 1 to metal complex 448 have the structure Ir(L a )2L b where the two L aare equal and L a and L b correspond to the structures shown in the table below: metal complex L a L b metal complex L a L b 1 L a1 L b1 2 L a1 L b2 3 L a1 L b3 4 L a1 L b4 5 L a1 L b221 6 L a1 L b227 7 L a1 L b477 8 L a1 L b481 9 L a1 L b485 10 L a1 L b497 11 L a1 L b501 12 L a1 L b597 13 L a1 L b623 14 L a1 L b624 15 L a1 L b625 16 L a1 L b632 17 L a1 L b680 18 L a1 L b687 19 L a1 L b688 20 L a1 L b689 21 L a1 L b691 22 L a1 L b736 23 L a1 L b737 24 L a1 L b743 25 L a1 L b745 26 L a1 L b750 27 L a1 L b753 28 L a1 L b763 29 L a1 L b764 30 L a1 L b766 31 L a4 L b1 32 L a4 L b2 33 L a4 L b3 34 L a4 L b4 35 L a4 L b221 36 L a4 L b227 37 L a4 L b477 38 L a4 L b481 39 L a4 L b485 40 L a4 L b497 41 L a4 L b501 42 L a4 L b597 43 L a4 L b623 44 L a4 L b624 45 L a4 L b625 46 L a4 L b632 47 L a4 L b680 48 L a4 L b687 49 L a4 L b688 50 L a4 L b689 51 L a4 L b691 52 L a4 L b736 53 L a4 L b737 54 L a4 L b743 55 L a4 L b745 56 L a4 L b750 57 L a4 L b753 58 L a4 L b763 59 L a4 L b764 60 L a4 L b766 61 L a5 L b1 62 L a5 L b2 63 L a5 L b3 64 L a5 L b4 65 L a5 L b221 66 L a5 L b227 67 L a5 L b477 68 L a5 L b481 69 L a5 L b485 70 L a5 L b497 71 L a5 L b501 72 L a5 L b597 73 L a5 L b623 74 L a5 L b624 75 L a5 L b625 76 L a5 L b632 77 L a5 L b680 78 L a5 L b687 79 L a5 L b688 80 L a5 L b689 81 L a5 L b691 82 L a5 L b736 83 L a5 L b737 84 L a5 L b743 85 L a5 L b745 86 L a5 L b750 87 L a5 L b753 88 L a5 L b763 89 L a5 L b764 90 L a5 L b766 91 L a19 L b1 92 L a19 L b2 93 L a19 L b3 94 L a19 L b4 95 L a19 L b221 96 L a19 L b227 97 L a19 L b477 98 L a19 L b481 99 L a19 L b485 100 L a19 L b497 101 L a19 L b501 102 L a19 L b597 103 L a19 L b623 104 L a19 L b624 105 L a19 L b625 106 L a19 L b632 107 L a19 L b680 108 L a19 L b687 109 L a19 L b688 110 L a19 L b689 111 L a19 L b691 112 L a19 L b736 113 L a19 L b737 114 L a19 L b743 115 L a19 L b745 116 L a19 L b750 117 L a19 L b753 118 L a19 L b763 119 L a19 L b764 120 L a19 L b766 121 L a22 L b1 122 L a22 L b2 123 L a22 L b3 124 L a22 L b4 125 L a22 L b221 126 L a22 L b227 127 L a22 L b477 128 L a22 L b481 129 L a22 L b485 130 L a22 L b497 131 L a22 L b501 132 L a22 L b597 133 L a22 L b623 134 L a22 L b624 135 L a22 L b625 136 L a22 L b632 137 L a22 L b680 138 L a22 L b687 139 L a22 L b688 140 L a22 L b689 141 L a22 L b691 142 L a22 L b736 143 L a22 L b737 144 L a22 L b743 145 L a22 L b745 146 L a22 L b750 147 L a22 L b753 148 L a22 L b763 149 L a22 L b764 150 L a22 L b766 151 L a32 L b1 152 L a32 L b2 153 L a32 L b3 154 L a32 L b4 155 L a32 L b221 156 L a32 L b227 157 L a32 L b477 158 L a32 L b481 159 L a32 L b485 160 L a32 L b497 161 L a32 L b501 162 L a32 L b597 163 L a32 L b623 164 L a32 L b624 165 L a32 L b625 166 L a32 L b632 167 L a32 L b680 168 L a32 L b687 169 L a32 L b688 170 L a32 L b689 171 L a32 L b691 172 L a32 L b736 173 L a32 L b737 174 L a32 L b743 175 L a32 L b745 176 L a32 L b750 177 L a32 L b753 178 L a32 L b763 179 L a32 L b764 180 L a32 L b766 181 L a71 L b1 182 L a71 L b2 183 L a71 L b3 184 L a71 L b4 185 L a71 L b221 186 L a71 L b227 187 L a71 L b477 188 L a71 L b481 189 L a71 L b485 190 L a71 L b497 191 L a71 L b501 192 L a71 L b597 193 L a71 L b623 194 L a71 L b624 195 L a71 L b625 196 L a71 L b632 197 L a71 L b680 198 L a71 L b687 199 L a71 L b688 200 L a71 L b689 201 L a71 L b691 202 L a71 L b736 203 L a71 L b737 204 L a71 L b743 205 L a71 L b745 206 L a71 L b750 207 L a71 L b753 208 L a71 L b763 209 L a71 L b764 210 L a71 L b766 211 L a84 L b1 212 L a84 L b2 213 L a84 L b3 214 L a84 L b4 215 L a84 L b221 216 L a84 L b227 217 L a84 L b477 218 L a84 L b481 219 L a84 L b485 220 L a84 L b497 221 L a84 L b501 222 L a84 L b597 223 L a84 L b623 224 L a84 L b624 225 L a84 L b625 226 L a84 L b632 227 L a84 L b680 228 L a84 L b687 229 L a84 L b688 230 L a84 L b689 231 L a84 L b691 232 L a84 L b736 233 L a84 L b737 234 L a84 L b743 235 L a84 L b745 236 L a84 L b750 237 L a84 L b753 238 L a84 L b763 239 L a84 L b764 240 L a84 L b766 241 L a87 L b1 242 L a87 L b2 243 L a87 L b3 244 L a87 L b4 245 L a87 L b221 246 L a87 L b227 247 L a87 L b477 248 L a87 L b481 249 L a87 L b485 250 L a87 L b497 251 L a87 L b501 252 L a87 L b597 253 L a87 L b623 254 L a87 L b624 255 L a87 L b625 256 L a87 L b632 257 L a87 L b680 258 L a87 L b687 259 L a87 L b688 260 L a87 L b689 261 L a87 L b691 262 L a87 L b736 263 L a87 L b737 264 L a87 L b743 265 L a87 L b745 266 L a87 L b750 267 L a87 L b753 268 L a87 L b763 269 L a87 L b764 270 L a87 L b766 271 L a129 L b1 272 L a129 L b2 273 L a129 L b3 274 L a129 L b4 275 L a129 L b221 276 L a129 L b227 277 L a129 L b477 278 L a129 L b481 279 L a129 L b485 280 L a129 L b497 281 L a129 L b501 282 L a129 L b597 283 L a129 L b623 284 L a129 L b624 285 L a129 L b625 286 L a129 L b632 287 L a129 L b680 288 L a129 L b687 289 L a129 L b688 290 L a129 L b689 291 L a129 L b691 292 L a129 L b736 293 L a129 L b737 294 L a129 L b743 295 L a129 L b745 296 L a129 L b750 297 L a129 L b753 298 L a129 L b763 299 L a129 L b764 300 L a129 L b766 301 L a134 L b1 302 L a134 L b2 303 L a134 L b3 304 L a134 L b4 305 L a134 L b221 306 L a134 L b227 307 L a134 L b477 308 L a134 L b481 309 L a134 L b485 310 L a134 L b497 311 L a134 L b501 312 L a134 L b597 313 L a134 L b623 314 L a134 L b624 315 L a134 L b625 316 L a134 L b632 317 L a134 L b680 318 L a134 L b687 319 L a134 L b688 320 L a134 L b689 321 L a134 L b691 322 L a134 L b736 323 L a134 L b737 324 L a134 L b743 325 L a134 L b745 326 L a134 L b750 327 L a134 L b753 328 L a134 L b763 329 L a134 L b764 330 L a134 L b766 331 L a135 L b1 332 L a135 L b2 333 L a135 L b3 334 L a135 L b4 335 L a135 L b221 336 L a135 L b227 337 L a135 L b477 338 L a135 L b481 339 L a135 L b485 340 L a135 L b497 341 L a135 L b501 342 L a135 L b597 343 L a135 L b623 344 L a135 L b624 345 L a135 L b625 346 L a135 L b632 347 L a135 L b680 348 L a135 L b687 349 L a135 L b688 350 L a135 L b689 351 L a135 L b691 352 L a135 L b736 353 L a135 L b737 354 L a135 L b743 355 L a135 L b745 356 L a135 L b750 357 L a135 L b753 358 L a135 L b763 359 L a135 L b764 360 L a135 L b766 361 L a138 L b1 362 L a138 L b2 363 L a138 L b3 364 L a138 L b4 365 L a138 L b221 366 L a138 L b227 367 L a138 L b477 368 L a138 L b481 369 L a138 L b485 370 L a138 L b497 371 L a138 L b501 372 L a138 L b597 373 L a138 L b623 374 L a138 L b624 375 L a138 L b625 376 L a138 L b632 377 L a138 L b680 378 L a138 L b687 379 L a138 L b688 380 L a138 L b689 381 L a138 L b691 382 L a138 L b736 383 L a138 L b737 384 L a138 L b743 385 L a138 L b745 386 L a138 L b750 387 L a138 L b753 388 L a138 L b763 389 L a138 L b764 390 L a138 L b766 391 L a161 L b1 392 L a161 L b2 393 L a161 L b3 394 L a161 L b4 395 L a161 L b221 396 L a161 L b227 397 L a161 L b477 398 L a161 L b481 399 L a161 L b485 400 L a161 L b497 401 L a161 L b501 402 L a161 L b597 403 L a161 L b623 404 L a161 L b624 405 L a161 L b625 406 L a161 L b632 407 L a161 L b680 408 L a161 L b687 409 L a161 L b688 410 L a161 L b689 411 L a161 L b691 412 L a161 L b736 413 L a161 L b737 414 L a161 L b743 415 L a161 L b745 416 L a161 L b750 417 L a161 L b753 418 L a161 L b763 419 L a161 L b764 420 L a161 L b766 421 L a168 L b1 422 L a168 L b2 423 L a168 L b3 424 L a168 L b4 425 L a168 L b221 426 L a168 L b227 427 L a168 L b477 428 L a168 L b481 429 L a168 L b485 430 L a168 L b497 431 L a168 L b501 432 L a168 L b597 433 L a168 L b623 434 L a168 L b624 435 L a168 L b625 436 L a168 L b632 437 L a168 L b680 438 L a168 L b687 439 L a168 L b688 440 L a168 L b689 441 L a168 L b691 442 L a168 L b736 443 L a168 L b737 444 L a168 L b743 445 L a168 L b745 446 L a168 L b750 447 L a168 L b753 448 L a168 L b763 [18] Electroluminescent device comprising: an anode, a cathode and an organic layer disposed between the anode and the cathode, wherein at least one layer of the organic layer contains the metal complex according to any one of claims 1-17. [19] The electroluminescent device according to claim 18, wherein the organic layer containing the metal complex is a light-emitting layer. [20] The electroluminescent device according to claim 19, wherein the light-emitting layer emits green light. [21] The electroluminescent device of claim 19, wherein the light-emitting layer further contains at least a first host compound; preferably the light-emitting layer contains at least two host compounds; more preferably, at least one of the host compounds comprises at least one chemical group selected from the group consisting of: benzene, pyridine, pyrimidine, triazine, carbazole, azacarbazole, indolocarbazole, dibenzothiophene, aza-dibenzothiophene, dibenzofuran, azadibenzofuran, dibenzoselenophene, triphenylene, azatriphenylene, fluorene, silafluorene, naphthalene, quinoline, isoquinoline, quinazoline, quinoxaline, phenanthrene, azaphenanthrene, and combinations thereof. [22] The electroluminescent device of claim 21, wherein the first host compound has a structure represented by formula 3: where L x, which may be the same or different at each occurrence, is selected from a single bond, substituted or unsubstituted alkylene having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkylene having 3 to 20 carbon atoms, substituted or unsubstituted arylene having 6 to 20 carbon atoms, substituted or unsubstituted heteroarylene having 3 to 20 carbon atoms, or a combination thereof; V, the same or different at each occurrence, is selected from C, CR v or N, and at least one of VC and with L x is connected; T, the same or different at each occurrence, is selected from C, CRt or N, and at least one of TC is and with L x is connected; R vand Rt, which may be the same or different at each occurrence, are selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, substituted or unsubstituted arylalkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms,substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a sulfanyl group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof; Ar1 is identical or different at each occurrence and is selected from substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, or a combination thereof; and neighboring substituents R v and Rt may optionally be joined together to form a ring; preferably the first host compound has a structure represented by one of the forms 3-a to 3-j: [23] The electroluminescent device of claim 21, wherein the metal complex is doped into the first host compound and the second host compound, and the weight of the metal complex is 1 to 30% of the total weight of the light-emitting layer; preferably the weight of the metal complex is 3 to 13% of the total weight of the light-emitting layer [24] A compound composition containing the metal complex according to any one of claims 1 to 17.

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