Organic electroluminescent material and device thereof

Abstract

Organic electroluminescent materials and devices thereof are disclosed. The organic electroluminescent material is a metal complex containing a La ligand with a structure shown in a formula 1, and the metal complex can be used as a luminescent material in an electroluminescent device. The novel compounds can be applied to electroluminescent devices, show more excellent performance, can reduce driving voltage, improve device efficiency, especially improve EQE, and finally can obviously improve the comprehensive performance of the devices. The invention also discloses an electroluminescent device containing the metal complex and a compound combination containing the metal complex.

Description

[0001] This application is a divisional application of the application with the filing date of February 6, 2021, application number: CN202110165117.5, and invention title "Organic Electroluminescent Materials and Devices". The entire content of the application CN202110165117.5 is incorporated herein by reference. Technical Field

[0002] The present invention relates to compounds for use in organic electronic devices, such as organic light-emitting devices. More particularly, it relates to a metal complex containing a ligand having the structure of Formula 1, and an electroluminescent device and a compound combination containing the metal complex. a Background Art

[0003] 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-effect quantum dots (OFQDs), light-emitting electrochemical cells (LECs), organic laser diodes, and organic electroluminescent devices.

[0004] In 1987, Tang and Van Slyke of Eastman Kodak reported a bilayer organic electroluminescent device, which included an arylamine hole transport layer and a tris-8-hydroxyquinoline-aluminum layer as an electron transport layer and a light-emitting layer (Applied Physics Letters, 1987, 51(12): 913-915). Once a bias voltage was applied to the device, green light was emitted from the device. This invention laid the foundation for the development of modern organic light-emitting diodes (OLEDs). The most advanced OLEDs can include multiple layers, such as charge injection and transport layers, charge and exciton blocking layers, and one or more light-emitting layers between the cathode and the anode. Since OLEDs are a self-luminous solid-state device, they offer great potential for display and lighting applications. In addition, the inherent properties of organic materials, such as their flexibility, can make them very suitable for special applications, such as in the fabrication of flexible substrates.

[0005] ​OLEDs can be classified into three different types according to their emission mechanisms. The OLED invented by Tang and van Slyke is a fluorescent OLED. It only uses singlet emission. The triplets generated in the device are wasted through non-radiative decay channels. Therefore, the internal quantum efficiency (IQE) of fluorescent OLEDs is only 25%. This limitation has hindered the commercialization of OLEDs. In 1997, Forrest and Thompson reported phosphorescent OLEDs, which use triplet emission from heavy metals in complexes as emitters. Therefore, it is able to harvest both singlet and triplet states, achieving 100% IQE. Due to its high efficiency, the discovery and development of phosphorescent OLEDs have 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 have a small singlet-triplet gap, making it possible for excitons to return from the triplet state to the singlet state. In TADF devices, triplet excitons can generate singlet excitons through reverse intersystem crossing, resulting in high IQE.

[0006] OLEDs can also be classified into small molecule and polymer OLEDs according to the form of the materials used. Small molecules refer to any organic or organometallic materials that are not polymers. As long as they have a precise structure, the molecular weight of small molecules can be very large. Dendrimers with a well-defined structure are considered small molecules. Polymer OLEDs include conjugated polymers and non-conjugated polymers with side-chain emitting groups. If post-polymerization occurs during the manufacturing process, small molecule OLEDs can turn into polymer OLEDs.

[0007] There are various methods for manufacturing OLEDs. Small molecule OLEDs are usually manufactured by vacuum thermal evaporation. Polymer OLEDs are manufactured by solution methods such as spin coating, inkjet printing, and nozzle printing. If the materials can be dissolved or dispersed in a solvent, small molecule OLEDs can also be manufactured by solution methods.

[0008] The emission color of OLEDs can be achieved through the structural design of the emitting materials. An OLED can include one or more emitting layers to achieve the desired spectrum. For green, yellow, and red OLEDs, phosphorescent materials have been successfully commercialized. Blue phosphorescent devices still have problems such as blue unsaturation, short device lifetime, and high operating voltage. Commercial full-color OLED displays usually adopt a hybrid strategy, using blue fluorescence and phosphorescent yellow, or red and green. Currently, the rapid reduction of the efficiency of phosphorescent OLEDs at high brightness is still a problem. In addition, more saturated emission spectra, higher efficiency, and longer device lifetimes are desired.

[0009] The applicant has disclosed a ligand structure as shown below in the previous US20200251666A1 where X1 -X 8 At least one of them is selected from C-CN. Further disclosed is an iridium complex having the following structure When it is applied to an organic electroluminescent device, it can improve the device performance and color saturation. Although it has reached a relatively high level in the industry, there is still room for improvement. In this application, only the metal complex with an aryl substituent where R 4 is phenyl and its application in the device are disclosed, and the effect of introducing a (hetero)aryl group specific to this application at a specific position in the metal complex on the device performance is not disclosed or taught.

[0010] In the previous US20200091442A1 of the present applicant, a ligand structure having the following structure is disclosed Further disclosed is an iridium complex having the following structure In this application, fluorine at a specific position of the ligand can improve the material performance, including improving the device lifetime, increasing the thermal stability, etc., and there is still room for improvement. In this application, only the metal complex with an aryl substituent where R 4 is phenyl and its application in the device are disclosed, and the effect of introducing a (hetero)aryl group specific to this application at a specific position in the metal complex on the device performance is not disclosed or taught.

[0011] US2013119354A1 discloses a metal complex having the following general formula structure: , where R 1 -R 4 is selected from hydrogen, deuterium, alkyl, cycloalkyl, aryl, heteroaryl, and combinations thereof. In this application, only the metal complex with an aryl substituent where R 1 is phenyl and its application in the device are disclosed, and the effect of introducing a (hetero)aryl group specific to this application at a specific position in the metal complex on the device performance is not disclosed or taught.

[0012] US20200287144A1 discloses a metal complex containing a ligand structure having the following structure where X 1 is selected from silicon and germanium. Further disclosed is an iridium complex having the following general formula structure: This application mainly focuses on the effect of introducing a silicon group or a germanium group into the metal complex on the device performance, and does not disclose or teach the effect of introducing a (hetero)aryl group specific to this application at a specific position in the metal complex on the device performance. Summary of the Invention

[0013] The present invention aims to provide a series of metal complexes containing the ligand L having the structure of Formula 1 to solve at least part of the above problems. a ​

[0014] According to an embodiment of the present invention, a metal complex is disclosed, which comprises a metal M and a ligand L coordinated with the metal M a , wherein L a has a structure represented by Formula 1:

[0015]

[0016] In Formula 1,

[0017] the metal M is selected from metals with a relative atomic mass greater than 40;

[0018] Cy is the same or different each time it appears and is selected from a substituted or unsubstituted aromatic ring having 6 - 24 ring atoms, a substituted or unsubstituted heteroaromatic ring having 5 - 24 ring atoms, or a combination thereof;

[0019] X is selected from the group consisting of O, S, Se, NR’, SiR’R’ and GeR’R’; when two R’s are present simultaneously, the two R’s are the same or different;

[0020] X 1 -X 5 is the same or different each time it appears and is selected from CR x or N;

[0021] Ar has a structure represented by Formula 2:

[0022]

[0023] a is selected from 0, 1, 2, 3, 4 or 5;

[0024] R a1 and R a2 are the same or different each time they appear and represent mono - substitution, multi - substitution or no substitution;

[0025] ring Ar 1 and ring Ar 2 are the same or different each time they appear and are selected from an aromatic ring having 6 - 30 ring atoms, a heteroaromatic ring having 5 - 30 ring atoms, or a combination thereof; and the total number of ring atoms of ring Ar 1 and ring Ar 2 is greater than or equal to 8;

[0026] R’, R x , R a1 and R a2Each occurrence is the same as or different from and is selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclic group having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted alkynyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermyl having 3-20 carbon atoms, substituted or unsubstituted arylgermyl having 6-20 carbon atoms, substituted or unsubstituted amino group having 0-20 carbon atoms, acyl group, carbonyl group, carboxyl group, ester group, cyano group, isocyano group, hydroxyl group, mercapto group, sulfinyl group, sulfonyl group, phosphino group, and combinations thereof;

[0027] "*" represents the connecting position of Formula 2;

[0028] Adjacent substituents R’, R x , R a1 , R a2 can optionally be connected to form a ring.

[0029] According to another embodiment of the present invention, an electroluminescent device is also disclosed, which includes:

[0030] An anode,

[0031] A cathode,

[0032] And an organic layer disposed between the anode and the cathode, and the organic layer contains the metal complex described in the foregoing embodiment.

[0033] According to another embodiment of the present invention, a compound combination is also disclosed, which contains the metal complex described in the foregoing embodiment.

[0034] A series of metal complexes containing a ligand L having the structure of Formula 1 disclosed by the present invention a can be used as a light-emitting material in an electroluminescent device. These novel compounds can be applied to an electroluminescent device to exhibit more excellent performance, can reduce the driving voltage, improve the device efficiency, especially the improvement of EQE, and ultimately can significantly improve the comprehensive performance of the device. Description of the Drawings

[0035] Figure 1 Schematic diagram of an organic light-emitting device that can contain the combination of metal complexes and compounds disclosed herein.

[0036] Figure 2 Schematic diagram of another organic light-emitting device that can contain the combination of metal complexes and compounds disclosed herein. Detailed Description of the Invention

[0037] OLEDs can be fabricated on various substrates such as glass, plastic, and metal. Figure 1 Schematically and non-limitingly shows an organic light-emitting device 100. The figures are not necessarily drawn to scale, and some layer structures in the figures can also be omitted as needed. The device 100 can include a substrate 101, an anode 110, a hole injection layer 120, a hole transport layer 130, an electron blocking layer 140, a light-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 sequentially depositing the described layers. The properties and functions of each layer and exemplary materials are described in more detail in columns 6-10 of U.S. Patent No. 7,279,704B2, the entire content of which is incorporated herein by reference.

[0038] There are more examples of each of these layers. For example, U.S. Patent No. 5,844,363, which is incorporated herein by reference in its entirety, discloses a flexible and transparent substrate-anode combination. An example of a p-doped hole transport layer is m-MTDATA doped with F 4 -TCNQ at a molar ratio of 50:1, as disclosed in U.S. Patent Application Publication No. 2003 / 0230980, which is incorporated herein by reference in its entirety. Examples of host materials are disclosed in U.S. Patent No. 6,303,238, issued to Thompson et al., which is incorporated herein by reference in its entirety. An example of an n-doped electron transport layer is BPhen doped with Li at a molar ratio of 1:1, as disclosed in U.S. Patent Application Publication No. 2003 / 0230980, which is incorporated herein by reference in its entirety. Examples of cathodes are disclosed in U.S. Patents Nos. 5,703,436 and 5,707,745, which are incorporated herein by reference in their entirety, and include a composite cathode having a thin metal layer such as Mg:Ag and an overlying transparent, conductive, sputter-deposited ITO layer. The principles and use of blocking layers are described in more detail in U.S. Patent No. 6,097,147 and U.S. Patent Application Publication No. 2003 / 0230980, which are incorporated herein by reference in their entirety. Examples of injection layers are provided in U.S. Patent Application Publication No. 2004 / 0174116, which is incorporated herein by reference in its entirety. A description of the protective layer can be found in U.S. Patent Application Publication No. 2004 / 0174116, which is incorporated herein by reference in its entirety.

[0039] The above-described layered structure is provided by way of non-limiting examples. The functions of the OLED can be achieved by combining the various layers described above, or some layers can be completely omitted. It can also include other layers not explicitly described. Within each layer, a single material or a mixture of multiple materials can be used to achieve optimal performance. Any functional layer can include several sub-layers. For example, the light-emitting layer can have two layers of different light-emitting materials to achieve the desired emission spectrum.

[0040] In one embodiment, the OLED can be described as having an "organic layer" disposed between the cathode and the anode. The organic layer can include one or more layers.

[0041] The OLED also requires a encapsulation layer, such as Figure 2 Schematically and non-limitingly shows the organic light-emitting device 200, which Figure 1 Differently, an encapsulation layer 102 can also be included above the cathode 190 to prevent harmful substances from the environment, such as moisture and oxygen. Any material capable of providing an encapsulation function can be used as the encapsulation layer, such as glass or an organic-inorganic hybrid layer. The encapsulation layer should be placed directly or indirectly outside the OLED device. Multilayer thin film encapsulation is described in U.S. Patent US7,968,146B2, the entire content of which is incorporated herein by reference.

[0042] Devices manufactured according to embodiments of the present invention can be incorporated into various consumer products having one or more electronic component modules (or units) with the device. Some examples of these consumer products include flat panel displays, monitors, medical monitors, televisions, billboards, lights for indoor or outdoor lighting and / or signaling, head-up displays, fully or partially transparent displays, flexible displays, smart phones, tablet computers, phablets, wearable devices, smart watches, laptop computers, digital cameras, portable video cameras, viewfinders, microdisplays, 3-D displays, vehicle displays, and taillights.

[0043] The materials and structures described herein can also be used in other organic electronic devices listed above.

[0044] As used herein, "top" means farthest from the substrate, and "bottom" means closest to the substrate. In the case where the first layer is described as being "disposed" "on" the second layer, the first layer is disposed farther from the substrate. Unless it is specified that the first layer "contacts" the second layer, there can be other layers between the first and second layers. For example, even though there are various organic layers between the cathode and the anode, the cathode can still be described as being "disposed" "on" the anode.

[0045] As used herein, "solution processable" means capable of being dissolved, dispersed or transported in a liquid medium in the form of a solution or suspension and / or deposited from a liquid medium.

[0046] When a ligand is believed to directly contribute to the photosensitive properties of an emissive material, the ligand can be termed "photosensitive". When a ligand is believed not to contribute to the photosensitive properties of an emissive material, the ligand can be termed "auxiliary", but an auxiliary ligand can modify the properties of a photosensitive ligand.

[0047] It is believed that the internal quantum efficiency (IQE) of a fluorescent OLED can exceed the 25% spin statistics limit by delayed fluorescence. Delayed fluorescence can generally be divided into two types, namely P-type delayed fluorescence and E-type delayed fluorescence. P-type delayed fluorescence is generated by triplet-triplet annihilation (TTA).

[0048] On the other hand, E-type delayed fluorescence does not rely on the collision of two triplets, but rather on the conversion between a triplet and a singlet excited state. Compounds capable of generating E-type delayed fluorescence need to have a very small singlet-triplet gap for the energy state conversion. Thermal energy can activate the transition from the triplet state back to the singlet state. This type of delayed fluorescence is also called thermally activated delayed fluorescence (TADF). A remarkable feature of TADF is that the delayed component increases with increasing temperature. If the reverse intersystem crossing (RISC) rate is fast enough to minimize the non-radiative decay of the triplet state, then the fraction of the singlet excited state refilled can reach 75%. The total singlet fraction can be 100%, far exceeding the 25% spin statistics of electro-generated excitons.

[0049] The characteristics of E-type delayed fluorescence can be seen in an exciplex system or a single compound. Without being bound by theory, it is believed that E-type delayed fluorescence requires the luminescent material to have a small singlet-triplet energy gap (ΔE S-T ). Organic non-metal-containing donor-acceptor luminescent materials may be able to achieve this. The emission of these materials is usually characterized as donor-acceptor charge transfer (CT) type emission. The spatial separation of the HOMO and LUMO in these donor-acceptor type compounds usually results in a small ΔE S-T . These states can include CT states. Generally, donor-acceptor luminescent materials are constructed by connecting an electron donor moiety (such as an amino or carbazole derivative) with an electron acceptor moiety (such as an N-containing six-membered aromatic ring).

[0050] Definition of substituent terms

[0051] Halogen or halide - as used herein, includes fluorine, chlorine, bromine and iodine.

[0052] Alkyl – As used herein, includes straight-chain and branched-chain alkyls. The alkyl can be an alkyl having 1 to 20 carbon atoms, preferably an alkyl having 1 to 12 carbon atoms, more preferably an alkyl having 1 to 6 carbon atoms. Examples of alkyls include methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, n-hexyl, n-heptyl, n-octyl, n-nonyl, n-decyl, n-undecyl, n-dodecyl, n-tridecyl, n-tetradecyl, n-pentadecyl, n-hexadecyl, n-heptadecyl, n-octadecyl, neopentyl, 1-methylpentyl, 2-methylpentyl, 1-pentylhexyl, 1-butylpentyl, 1-heptyloctyl, 3-methylpentyl. Among the above, methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, neopentyl and n-hexyl are preferred. Additionally, the alkyl can be optionally substituted.

[0053] Cycloalkyl – As used herein, includes cyclic alkyls. The cycloalkyl can be a cycloalkyl having 3 to 20 ring carbon atoms, preferably a cycloalkyl having 4 to 10 carbon atoms. Examples of cycloalkyls include cyclobutyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4,4-dimethylcyclohexyl, 1-adamantyl, 2-adamantyl, 1-norbornyl, 2-norbornyl, etc. Among the above, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4,4-dimethylcyclohexyl are preferred. Additionally, the cycloalkyl can be optionally substituted.

[0054] Heteroalkyl – As used herein, heteroalkyl is formed by substituting one or more carbons in the alkyl chain with heteroatoms selected from the group consisting of nitrogen atom, oxygen atom, sulfur atom, selenium atom, phosphorus atom, silicon atom, germanium atom and boron atom. The heteroalkyl can be a heteroalkyl having 1 to 20 carbon atoms, preferably a heteroalkyl having 1 to 10 carbon atoms, more preferably a heteroalkyl having 1 to 6 carbon atoms. Examples of heteroalkyls include methoxymethyl, ethoxymethyl, ethoxyethyl, methylthiomethyl, ethylthiomethyl, ethylthioethyl, methoxymethoxymethyl, ethoxymethoxymethyl, ethoxyethoxyethyl, hydroxymethyl, hydroxyethyl, hydroxypropyl, mercaptomethyl, mercaptoethyl, mercaptopropyl, aminomethyl, aminoethyl, aminopropyl, dimethylaminomethyl, trimethylgermylmethyl, trimethylgermylethyl, trimethylgermylisopropyl, dimethylethylgermylmethyl, dimethylisopropylgermylmethyl, tert-butyldimethylgermylmethyl, triethylgermylmethyl, triethylgermylethyl, triisopropylgermylmethyl, triisopropylgermylethyl, trimethylsilylmethyl, trimethylsilylethyl, trimethylsilylisopropyl, triisopropylsilylmethyl, triisopropylsilylethyl. Additionally, the heteroalkyl can be optionally substituted.

[0055] Alkenyl - As used herein, it encompasses straight-chain, branched-chain, and cyclic olefin groups. The alkenyl can be an alkenyl group having 2 to 20 carbon atoms, preferably an alkenyl group having 2 to 10 carbon atoms. Examples of alkenyl include vinyl, propenyl, 1-butenyl, 2-butenyl, 3-butenyl, 1,3-butadienyl, 1-methylethenyl, styryl, 2,2-diphenylethene-1,1-diyl, 1,2-diphenylethene-1,1-diyl, 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. Additionally, the alkenyl can be optionally substituted.

[0056] Alkynyl - As used herein, it encompasses straight-chain alkynyl groups. The alkynyl can be an alkynyl group having 2 to 20 carbon atoms, preferably an alkynyl group having 2 to 10 carbon atoms. Examples of alkynyl 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, phenylacetylenyl, phenylpropynyl, etc. Among the above, ethynyl, propynyl, propargyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-pentynyl, and phenylacetylenyl are preferred. Additionally, the alkynyl can be optionally substituted.

[0057] Aryl or aromatic group - As used herein, non-fused and fused systems are considered. The aryl can be an aryl group having 6 to 30 carbon atoms, preferably an aryl group having 6 to 20 carbon atoms, more preferably an aryl group having 6 to 12 carbon atoms. Examples of aryl include phenyl, biphenyl, terphenyl, triphenylene, tetraphenylene, naphthalene, anthracene, fluoranthene, phenanthrene, fluorene, pyrene, perylene, and azulene, preferably phenyl, biphenyl, terphenyl, triphenylene, fluorene, and naphthalene. Examples of non-fused aryl include phenyl, 2-biphenylyl, 3-biphenylyl, 4-biphenylyl, 4-p-terphenyl, 3-p-terphenyl, 2-p-terphenyl, 4-m-terphenyl, 3-m-terphenyl, 2-m-terphenyl, o-tolyl, m-tolyl, p-tolyl, p-(2-phenylpropyl)phenyl, 4'-methylbiphenyl-4-yl, 4''-tert-butyl-4-p-terphenyl, o-cumyl, m-cumyl, p-cumyl, 2,3-dimethylphenyl, 3,4-dimethylphenyl, 2,5-dimethylphenyl, mesityl, and m-quaterphenyl. Additionally, the aryl can be optionally substituted.

[0058] Heterocyclic group or heterocycle - As used herein, non-aromatic cyclic groups are contemplated. Non-aromatic heterocyclic groups include saturated heterocyclic groups having 3 to 20 ring atoms and unsaturated non-aromatic heterocyclic groups having 3 to 20 ring atoms, wherein at least one ring atom is selected from the group consisting of nitrogen atom, oxygen atom, sulfur atom, selenium atom, silicon atom, phosphorus atom, germanium atom and boron atom. Preferred non-aromatic heterocyclic groups are those having 3 to 7 ring atoms, which include at least one heteroatom such as nitrogen, oxygen, silicon or sulfur. Examples of non-aromatic heterocyclic groups include oxiranyl, oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, dioxolanyl, dioxanyl, aziridinyl, dihydropyrrolyl, tetrahydropyrrolyl, piperidinyl, oxazolidinyl, morpholinyl, piperazinyl, oxepinyl, thiepinyl, azepinyl and tetrahydrothienyl. Additionally, the heterocyclic group may be optionally substituted.

[0059] Heteroaryl - As used herein, non-fused and fused heteroaromatic groups that may contain 1 to 5 heteroatoms, wherein at least one heteroatom is selected from the group consisting of nitrogen atom, oxygen atom, sulfur atom, selenium atom, silicon atom, phosphorus atom, germanium atom and boron atom. Heteroaryl also refers to heteroaromatic group. Heteroaryl may be a heteroaryl having 3 to 30 carbon atoms, preferably a heteroaryl having 3 to 20 carbon atoms, more preferably a heteroaryl having 3 to 12 carbon atoms. Suitable heteroaryls include dibenzothiophene, dibenzofuran, dibenzoselenophene, furan, thiophene, benzofuran, benzothiophene, benzoselenophene, carbazole, indolocarbazole, pyridoindole, pyrrolopyridine, pyrazole, imidazole, triazole, oxazole, thiazole, oxadiazole, oxatriazole, dioxazole, thiadiazole, pyridine, pyridazine, pyrimidine, pyrazine, triazine, oxazine, oxathiazine, oxadiazine, indole, benzimidazole, indazole, indenoazine, benzoxazole, benzisoxazole, benzothiazole, quinoline, isoquinoline, cinnoline, quinazoline, quinoxaline, naphthyridine, phthalazine, pteridine, xanthene, acridine, phenazine, phenothiazine, benzofuranopyridine, furanodipyridine, benzothiophenopyridine, thiophenodipyridine, benzoselenophenopyridine, selenobenzodipyridine, preferably dibenzothiophene, dibenzofuran, dibenzoselenophene, carbazole, indolocarbazole, imidazole, pyridine, triazine, benzimidazole, 1,2-azaborole, 1,3-azaborole, 1,4-azaborole, borazole and their nitrogen analogs. Additionally, the heteroaryl may be optionally substituted.

[0060] Alkoxy - As used herein, it is represented by -O-alkyl, -O-cycloalkyl, -O-heteroalkyl or -O-heterocycloalkyl. Examples and preferred examples of alkyl, cycloalkyl, heteroalkyl and heterocycloalkyl are the same as those described above. The alkoxy can be an alkoxy having 1 to 20 carbon atoms, preferably an alkoxy having 1 to 6 carbon atoms. Examples of alkoxy include methoxy, ethoxy, propoxy, butoxy, pentyloxy, hexyloxy, cyclopropyloxy, cyclobutyloxy, cyclopentyloxy, cyclohexyloxy, tetrahydrofuryloxy, tetrahydropyranyloxy, methoxypropyl-oxy, ethoxyethyl-oxy, methoxymethyl-oxy and ethoxymethyl-oxy. Additionally, the alkoxy can be optionally substituted.

[0061] Aryloxy - As used herein, it is represented by -O-aryl or -O-heteroaryl. Examples and preferred examples of aryl and heteroaryl are the same as those described above. The aryloxy can be an aryloxy having 6 to 30 carbon atoms, preferably an aryloxy having 6 - 20 carbon atoms. Examples of aryloxy include phenoxy and biphenyloxy. Additionally, the aryloxy can be optionally substituted.

[0062] Aralkyl - As used herein, it encompasses aryl-substituted alkyl. The aralkyl can be an aralkyl having 7 to 30 carbon atoms, preferably an aralkyl having 7 to 20 carbon atoms, more preferably an aralkyl having 7 to 13 carbon atoms. Examples of aralkyl include benzyl, 1-phenylethyl, 2-phenylethyl, 1-phenylisopropyl, 2-phenylisopropyl, phenyl tert-butyl, α-naphthylmethyl, 1-α-naphthyl-ethyl, 2-α-naphthylethyl, 1-α-naphthylisopropyl, 2-α-naphthylisopropyl, β-naphthylmethyl, 1-β-naphthyl-ethyl, 2-β-naphthyl-ethyl, 1-β-naphthylisopropyl, 2-β-naphthylisopropyl, p-methylbenzyl, m-methylbenzyl, o-methylbenzyl, p-chlorobenzyl, m-chlorobenzyl, o-chlorobenzyl, p-bromobenzyl, m-bromobenzyl, o-bromobenzyl, p-iodobenzyl, m-iodobenzyl, o-iodobenzyl, 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 and 1-chloro-2-phenylisopropyl. Among the above, benzyl, p-cyanobenzyl, m-cyanobenzyl, o-cyanobenzyl, 1-phenylethyl, 2-phenylethyl, 1-phenylisopropyl and 2-phenylisopropyl are preferred. Additionally, the aralkyl can be optionally substituted.

[0063] Alkylsilyl - As used herein, alkyl substituted silicon groups are contemplated. The alkylsilyl group may be an alkylsilyl group having 3-20 carbon atoms, preferably an alkylsilyl group having 3 to 10 carbon atoms. Examples of alkylsilyl groups include trimethylsilyl, triethylsilyl, methyldiethylsilyl, ethyldimethylsilyl, tripropylsilyl, tributylsilyl, triisopropylsilyl, methyldiisopropylsilyl, dimethylisopropylsilyl, tri-tert-butylsilyl, triisobutylsilyl, dimethyltert-butylsilyl, methyldi-tert-butylsilyl. In addition, the alkylsilyl group may be optionally substituted.

[0064] Arylsilyl - as used herein, encompasses at least one aryl-substituted silicon group. The arylsilyl group may be an arylsilyl group having 6 to 30 carbon atoms, preferably an arylsilyl group having 8 to 20 carbon atoms. Examples of arylsilyl groups include triphenylsilyl, phenyldiphenylsilyl, diphenylbiphenylsilyl, phenyldiethylsilyl, diphenylethylsilyl, phenyldimethylsilyl, diphenylmethylsilyl, phenyldiisopropylsilyl, diphenylisopropylsilyl, diphenylbutylsilyl, diphenylisobutylsilyl, diphenyltert-butylsilyl. In addition, the arylsilyl group may be optionally substituted.

[0065] Alkylgermanyl - As used herein, alkyl substituted germanyl is contemplated. The alkylgermanyl may be an alkylgermanyl having 3-20 carbon atoms, preferably an alkylgermanyl having 3 to 10 carbon atoms. Examples of alkylgermanyl include trimethylgermanyl, triethylgermanyl, methyldiethylgermanyl, ethyldimethylgermanyl, tripropylgermanyl, tributylgermanyl, triisopropylgermanyl, methyldiisopropylgermanyl, dimethylisopropylgermanyl, tri-tert-butylgermanyl, triisobutylgermanyl, dimethyltert-butylgermanyl, methyldi-tert-butylgermanyl. In addition, the alkylgermanyl may be optionally substituted.

[0066] Arylgermanyl - as used herein, encompasses germanyl substituted with at least one aryl or heteroaryl group. The arylgermanyl may be an arylgermanyl having 6 to 30 carbon atoms, preferably an arylgermanyl having 8 to 20 carbon atoms. Examples of arylgermanyl include triphenylgermanyl, phenyldibiphenylgermanyl, diphenylbiphenylgermanyl, phenyldiethylgermanyl, diphenylethylgermanyl, phenyldimethylgermanyl, diphenylmethylgermanyl, phenyldiisopropylgermanyl, diphenylisopropylgermanyl, diphenylbutylgermanyl, diphenylisobutylgermanyl, diphenyltert-butylgermanyl. In addition, the arylgermanyl may be optionally substituted.

[0067] In terms such as azadibenzofuran and azadibenzothiophene, the term "aza" means that one or more C-H groups in the corresponding aromatic moiety are replaced by nitrogen atoms. For example, azatriphenylene includes dibenzo[f,h]quinoxaline, dibenzo[f,h]quinoline, and other analogs having two or more nitrogens in the ring system. Those of ordinary skill in the art can readily envision other nitrogen analogs of the above-described aza derivatives, and all such analogs are determined to be included within the terms described herein.

[0068] In the present disclosure, unless otherwise defined, when any one of the terms in the following group is used: substituted alkyl, substituted cycloalkyl, substituted heteroalkyl, substituted heterocyclic group, substituted aralkyl, substituted alkoxy, substituted aryloxy, substituted alkenyl, substituted alkynyl, substituted aryl, substituted heteroaryl, substituted alkylsilyl, substituted arylsilyl, substituted alkylgermyl, substituted arylgermyl, substituted amino, substituted acyl, substituted carbonyl, substituted carboxyl group, substituted ester group, substituted sulfinyl, it means that any one of the groups alkyl, cycloalkyl, heteroalkyl, heterocyclic group, aralkyl, alkoxy, aryloxy, alkenyl, alkynyl, aryl, heteroaryl, alkylsilyl, arylsilyl, alkylgermyl, arylgermyl, amino, acyl, carbonyl, carboxyl group, ester group, sulfinyl, sulfonyl, and phosphino can be substituted by one or more selected from deuterium, halogen, unsubstituted alkyl having 1-20 carbon atoms, unsubstituted cycloalkyl having 3-20 ring carbon atoms, unsubstituted heteroalkyl having 1-20 carbon atoms, unsubstituted heterocyclic group having 3-20 ring atoms, unsubstituted aralkyl having 7-30 carbon atoms, unsubstituted alkoxy having 1-20 carbon atoms, unsubstituted aryloxy having 6-30 carbon atoms, unsubstituted alkenyl having 2-20 carbon atoms, unsubstituted alkynyl having 2-20 carbon atoms, unsubstituted aryl having 6-30 carbon atoms, unsubstituted heteroaryl having 3-30 carbon atoms, unsubstituted alkylsilyl having 3-20 carbon atoms, unsubstituted arylsilyl having 6-20 carbon atoms, unsubstituted alkylgermyl having 3-20 carbon atoms, unsubstituted arylgermyl having 6-20 carbon atoms, unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxyl group, ester group, cyano, isocyano, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof.

[0069] It should be understood that when a molecular fragment is described as a substituent or otherwise attached to another moiety, its name can be written according to whether it is a fragment (e.g., phenyl, phenylene, naphthyl, dibenzofuranyl) or according to whether it is the entire molecule (such as benzene, naphthalene, dibenzofuran). As used herein, these different ways of specifying a substituent or linking fragment are considered equivalent.

[0070] In the compounds mentioned in the present disclosure, hydrogen atoms can be partially or fully replaced by deuterium. Other atoms such as carbon and nitrogen can also be replaced by their other stable isotopes. Due to enhancing the efficiency and stability of the device, the replacement of other stable isotopes in the compounds may be preferred.

[0071] In the compounds mentioned in the present disclosure, multiple substitution refers to the range including double substitution up to the maximum available substitution. When a certain substituent in the compounds mentioned in the present disclosure indicates multiple substitution (including disubstitution, trisubstitution, tetrasubstitution, etc.), it means that the substituent can be present at multiple available substitution positions on its connecting structure, and the substituent present at multiple available substitution positions can be of the same structure or different structures.

[0072] In the compounds mentioned in the present disclosure, unless explicitly defined, for example, adjacent substituents can optionally connect to form a ring, adjacent substituents in the compounds cannot connect to form a ring. In the compounds mentioned in the present disclosure, adjacent substituents can optionally connect to form a ring, which includes both the case where adjacent substituents can connect to form a ring and the case where adjacent substituents do not connect to form a ring. When adjacent substituents can optionally connect to form a ring, the formed ring can be a monocyclic or polycyclic ring (including spiro ring, bridged ring, fused ring, etc.), and an alicyclic ring, heteroalicyclic ring, aromatic ring or heteroaromatic ring. In this expression, adjacent substituents can refer to substituents bonded to the same atom, substituents bonded to carbon atoms directly bonded to each other, or substituents bonded to carbon atoms further away. Preferably, adjacent substituents refer to substituents bonded to the same carbon atom and substituents bonded to carbon atoms directly bonded to each other.

[0073] The expression that adjacent substituents can optionally connect to form a ring is also intended to be considered as referring to two substituents bonded to the same carbon atom connecting to each other through a chemical bond to form a ring, which can be exemplified by the following formula:

[0074]

[0075] The expression that adjacent substituents can optionally connect to form a ring is also intended to be considered as referring to two substituents bonded to carbon atoms directly bonded to each other connecting to each other through a chemical bond to form a ring, which can be exemplified by the following formula:

[0076]

[0077] The expression that adjacent substituents can optionally connect to form a ring is also intended to be considered as referring to two substituents bonded to carbon atoms further away connecting to each other through a chemical bond to form a ring, which can be exemplified by the following formula:

[0078]

[0079] In addition, the statement that adjacent substituents can optionally be linked to form a ring is also intended to be construed as meaning that, when one of the two adjacent substituents represents hydrogen, the second substituent is bonded at the position to which the hydrogen atom is bonded, thereby forming a ring. This is illustrated by the following formula:

[0080]

[0081] According to one embodiment of the present invention, there is disclosed a metal complex comprising a metal M and a ligand L coordinated with the metal M a , wherein L a has a structure represented by Formula 1:

[0082]

[0083] In Formula 1,

[0084] the metal M is selected from metals having a relative atomic mass greater than 40;

[0085] Cy is the same or different each time it appears and is selected from a substituted or unsubstituted aromatic ring having 6 - 24 ring atoms, a substituted or unsubstituted heteroaromatic ring having 5 - 24 ring atoms, or a combination thereof;

[0086] X is selected from the group consisting of O, S, Se, NR', SiR'R' and GeR'R'; when two R's are present simultaneously, the two R's are the same or different;

[0087] X 1 -X 5 is the same or different each time it appears and is selected from CR x or N;

[0088] Ar has a structure represented by Formula 2:

[0089]

[0090] a is selected from 0, 1, 2, 3, 4 or 5;

[0091] R a1 and R a2 are the same or different each time they appear and represent mono - substituted, multi - substituted or unsubstituted;

[0092] The ring Ar 1 and the ring Ar 2 are the same or different each time they appear and are selected from an aromatic ring having 6 - 30 ring atoms, a heteroaromatic ring having 5 - 30 ring atoms, or a combination thereof; and the total number of ring atoms of the ring Ar 1 and the ring Ar 2 is greater than or equal to 8;

[0093] R', R x, R a1 and R a2 each occurrence is independently 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, substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, substituted or unsubstituted aralkyl 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 alkynyl 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 alkylgermyl having 3 to 20 carbon atoms, substituted or unsubstituted arylgermyl having 6 to 20 carbon atoms, substituted or unsubstituted amino group having 0 to 20 carbon atoms, acyl group, carbonyl group, carboxyl group, ester group, cyano group, isocyano group, hydroxyl group, mercapto group, sulfinyl group, sulfonyl group, phosphino group, and combinations thereof;

[0094] "*" represents the linking position of Formula 2;

[0095] adjacent substituents R', R x , R a1 , R a2 can optionally be linked to form a ring.

[0096] As used herein, "adjacent substituents R', R x , R a1 , R a2 can optionally be linked to form a ring" is intended to mean that among adjacent substituent groups, for example, between two substituents R', between two substituents R x , between two substituents R a1 , between two substituents R a2 , between two substituents R a1 and R a2 , any one or more of these substituent groups can be linked to form a ring. Obviously, these substituents may also not be linked to form a ring at all.

[0097] In this text, the "ring atoms" in aromatic rings and heteroaromatic rings refer to the atoms that are bonded to form an aromatic ring structure (e.g., monocyclic (hetero)aromatic rings, fused (hetero)aromatic rings). The carbon atoms and heteroatoms (including but not limited to O, S, N, Se, or Si, etc.) in the ring are all counted in the number of ring atoms. When the ring is substituted by substituents, the atoms contained in the substituents are not included in the number of ring atoms. For example, the number of ring atoms in phenyl, pyridyl, and triazinyl is 6; the number of ring atoms in dibenzothiophene and dibenzofuran is 8; the number of ring atoms in benzothienyl and benzofuryl is 9; the number of ring atoms in naphthyl, quinolinyl, isoquinolinyl, quinazolinyl, and quinoxalinyl is 10; the number of ring atoms in dibenzothiophene, dibenzofuran, fluorene, azadibenzothiophene, azadibenzofuran, and azafluorene is 13; the various examples described here are only for illustration, and other cases can be inferred by analogy. When a is 0 in Formula 2, it means that Ar has the structure represented, and at this time, "ring Ar 1 and ring Ar 2 have a total number of ring atoms greater than or equal to 8" means that ring Ar 1 is an aromatic ring or heteroaromatic ring with a total number of ring atoms greater than or equal to 8; when a is 1 in Formula 2, it means that Ar has the structure represented by ; for example, at this time, both ring Ar 1 and ring Ar 2 are phenyl, and when both R a1 and R a2 are hydrogen, the total number of ring atoms in ring Ar 1 and ring Ar 2 is equal to 12; another example is that at this time, both ring Ar 1 and ring Ar 2 are phenyl, both R a1 are hydrogen, and when R a2 is monosubstituted and is phenyl, the total number of ring atoms in ring Ar 1 and ring Ar 2 is equal to 12. Other cases can be inferred by analogy.

[0098] According to an embodiment of the present invention, Cy is selected from any one of the structures consisting of:

[0099]

[0100] Wherein,

[0101] R, each time it appears, represents monosubstitution, polysubstitution, or no substitution, the same or different; when there are multiple Rs in any one of the structures, the Rs are the same or different;

[0102] Each occurrence of R is the same as or different from each other and is selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclic group having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted alkynyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermyl having 3-20 carbon atoms, substituted or unsubstituted arylgermyl having 6-20 carbon atoms, substituted or unsubstituted amino group having 0-20 carbon atoms, acyl group, carbonyl group, carboxyl group, ester group, cyano group, isocyano group, hydroxyl group, mercapto group, sulfinyl group, sulfonyl group, phosphino group, and combinations thereof;

[0103] Adjacent substituents R can optionally be joined to form a ring;

[0104] wherein, ‘#’ represents the position connected to metal M, represents the position connected to X 1 , X 2 , X 3 or X 4 connected position.

[0105] In this article, "adjacent substituents R can optionally be joined to form a ring" is intended to mean that in the substituent group formed by any two adjacent substituents R, any one or more of them can be joined to form a ring. Obviously, these substituents may also not be joined to form a ring.

[0106] According to one embodiment of the present invention, wherein L a each occurrence is the same as or different from each other and is selected from the group consisting of:

[0107]

[0108]

[0109] X is selected from the group consisting of O, S, Se, NR', SiR'R' and GeR'R'; when two R's are present simultaneously, the two R's are the same as or different from each other;

[0110] Ar has the structure represented by Formula 2:

[0111]

[0112] a is selected from 0, 1, 2, 3, 4 or 5;

[0113] ring Ar 1 and ring Ar 2 each occurrence is the same or different and is selected from an aromatic ring having 6 - 30 ring atoms, a heteroaromatic ring having 5 - 30 ring atoms, or a combination thereof; and the total number of ring atoms of ring Ar 1 and ring Ar 2 is greater than or equal to 8;

[0114] R, R x , R a1 and R a2 each occurrence is the same or different and represents mono - substitution, multi - substitution, or no substitution;

[0115] R, R’, R x , R a1 and R a2 each occurrence is the same or different and is selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 - 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 - 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 - 20 carbon atoms, substituted or unsubstituted heterocyclic group having 3 - 20 ring atoms, substituted or unsubstituted aralkyl having 7 - 30 carbon atoms, substituted or unsubstituted alkoxy having 1 - 20 carbon atoms, substituted or unsubstituted aryloxy having 6 - 30 carbon atoms, substituted or unsubstituted alkenyl having 2 - 20 carbon atoms, substituted or unsubstituted alkynyl having 2 - 20 carbon atoms, substituted or unsubstituted aryl having 6 - 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 - 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 - 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 - 20 carbon atoms, substituted or unsubstituted alkylgermyl having 3 - 20 carbon atoms, substituted or unsubstituted arylgermyl having 6 - 20 carbon atoms, substituted or unsubstituted amino having 0 - 20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0116] adjacent substituents R, R’, R x , R a1 and R a2 can optionally be linked to form a ring;

[0117] “*” represents the linking position of formula 2.

[0118] In this text, “adjacent substituents R, R’, R x, R a1 and R a2 "can optionally be linked to form a ring", which is intended to indicate adjacent substituent groups, for example, between two substituents R, between two substituents R', between two substituents R x between, between two substituents R a1 between, between two substituents R a2 between, between two substituents R a1 and R a2 between, any one or more of these substituent groups can be linked to form a ring. Obviously, these substituents may also not be linked to form a ring at all.

[0119] According to one embodiment of the present invention, wherein the metal complex has the general formula M(L a ) m (L b ) n (L c ) q ;

[0120] Wherein,

[0121] M is the same or different each time it appears and is selected from the group consisting of Cu, Ag, Au, Ru, Rh, Pd, Os, Ir and Pt; preferably, M is the same or different each time it appears and is selected from Pt or Ir;

[0122] L a , L b and L c are the first, second and third ligands coordinated to the metal M respectively, and L c and the said L a or L b are the same or different; wherein, L a , L b and L c can optionally be linked to form a polydentate ligand;

[0123] m is selected from 1, 2 or 3, n is selected from 0, 1 or 2, q is selected from 0, 1 or 2, and m + n + q is equal to the oxidation state of the metal M; when m is greater than or equal to 2, the plurality of L a are the same or different; when n is equal to 2, the two L b are the same or different; when q is equal to 2, the two L c are the same or different;

[0124] L b and L c are the same or different each time they appear and are each selected from any one of the structures shown in the group consisting of:

[0125]

[0126]

[0127] Wherein,

[0128] R a ,R b each occurrence independently represents a single substitution, multiple substitutions, or no substitution;

[0129] X b each occurrence independently is selected from the group consisting of: O, S, Se, NR N1 ,CR C1 R C2 ;

[0130] R a ,R b ,R c ,R N1 ,R C1 and R C2 each occurrence independently is selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 - 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 - 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 - 20 carbon atoms, substituted or unsubstituted heterocyclic group having 3 - 20 ring atoms, substituted or unsubstituted aralkyl having 7 - 30 carbon atoms, substituted or unsubstituted alkoxy having 1 - 20 carbon atoms, substituted or unsubstituted aryloxy having 6 - 30 carbon atoms, substituted or unsubstituted alkenyl having 2 - 20 carbon atoms, substituted or unsubstituted alkynyl having 2 - 20 carbon atoms, substituted or unsubstituted aryl having 6 - 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 - 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 - 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 - 20 carbon atoms, substituted or unsubstituted alkylgermyl having 3 - 20 carbon atoms, substituted or unsubstituted arylgermyl having 6 - 20 carbon atoms, substituted or unsubstituted amino group having 0 - 20 carbon atoms, acyl group, carbonyl group, carboxyl group, ester group, cyano group, isocyano group, hydroxyl group, mercapto group, sulfinyl group, sulfonyl group, phosphino group, and combinations thereof;

[0131] Adjacent substituents R a ,R b ,R c ,R N1 ,R C1 and R C2 can optionally be linked to form a ring.

[0132] As used herein, "adjacent substituents R a ,R b ,R c ,RN1 , R C1 and R C2 may optionally be linked to form a ring”, is intended to indicate adjacent substituent groups, for example, between two substituents R a s, between two substituents R b s, between two substituents R c s, between the substituent R a and R b s, between the substituent R a and R c s, between the substituent R b and R c s, between the substituent R a and R N1 s, between the substituent R b and R N1 s, between the substituent R a and R C1 s, between the substituent R a and R C2 s, between the substituent R b and R C1 s, between the substituent R b and R C2 s, and between R C1 and R C2 s, any one or more of these substituent groups may be linked to form a ring. Obviously, these substituents may also not be linked to form a ring at all.

[0133] According to an embodiment of the present invention, wherein the metal M is the same or different each time it appears and is selected from the group consisting of Cu, Ag, Au, Ru, Rh, Pd, Os, Ir, and Pt.

[0134] According to an embodiment of the present invention, wherein the metal M is the same or different each time it appears and is selected from Pt or Ir.

[0135] According to an embodiment of the present invention, wherein the metal complex Ir(L a ) m (L b ) 3-m has a structure represented by Formula 3:

[0136]

[0137] wherein,

[0138] X is selected from the group consisting of O, S, Se, NR’, SiR’R’, and GeR’R’; when two R’s are present simultaneously, the two R’s are the same or different;

[0139] m is selected from 1, 2, or 3; when m is selected from 1, the two Lb identical or different; when m is selected from 2 or 3, multiple Ls a identical or different;

[0140] Y 1 -Y 4 each occurrence is independently selected from CR y or N;

[0141] X 1 -X 5 each occurrence is independently selected from CR x or N;

[0142] Ar has a structure represented by Formula 2:

[0143]

[0144] a is selected from 0, 1, 2, 3, 4 or 5;

[0145] R a1 and R a2 each occurrence is independently mono-substituted, multi-substituted or unsubstituted;

[0146] ring Ar 1 and ring Ar 2 each occurrence is independently selected from an aromatic ring having 6 - 30 ring atoms, a heteroaromatic ring having 5 - 30 ring atoms, or a combination thereof; and the total number of ring atoms of ring Ar 1 and ring Ar 2 is greater than or equal to 8;

[0147] "*" represents the connection position of Formula 2;

[0148] R', R x , R y , R 1 -R 8 , R a1 and R a2Each occurrence is the same as or different from and is selected from the group consisting of: hydrogen, deuterium, a halogen, a substituted or unsubstituted alkyl having 1-20 carbon atoms, a substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, a substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3-20 ring atoms, a substituted or unsubstituted aralkyl having 7-30 carbon atoms, a substituted or unsubstituted alkoxy having 1-20 carbon atoms, a substituted or unsubstituted aryloxy having 6-30 carbon atoms, a substituted or unsubstituted alkenyl having 2-20 carbon atoms, a substituted or unsubstituted alkynyl having 2-20 carbon atoms, a substituted or unsubstituted aryl having 6-30 carbon atoms, a substituted or unsubstituted heteroaryl having 3-30 carbon atoms, a substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, a substituted or unsubstituted arylsilyl having 6-20 carbon atoms, a substituted or unsubstituted alkylgermyl having 3-20 carbon atoms, a substituted or unsubstituted arylgermyl having 6-20 carbon atoms, a substituted or unsubstituted amino group having 0-20 carbon atoms, an acyl group, a carbonyl group, a carboxyl group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof;

[0149] The adjacent substituents R', R x , R y , R a1 , R a2 can optionally be linked to form a ring;

[0150] The adjacent substituents R 1 -R 8 can optionally be linked to form a ring.

[0151] As used herein, "the adjacent substituents R', R x , R y , R a1 , R a2 can optionally be linked to form a ring" is intended to mean that among the adjacent substituent groups, for example, between two substituents R', between two substituents R x , between two substituents R y , between two substituents R a1 , between two substituents R a2 , between two substituents R a1 and R a2 , between two substituents R' and R x , any one or more of these substituent groups can be linked to form a ring. Obviously, these substituents may also not be linked to form a ring at all. "The adjacent substituents R 1 -R 8"optionally connected to form a ring", which is intended to indicate adjacent substituent groups, for example, adjacent substituents R 1 and R 2 between, adjacent substituents R 3 and R 2 between, adjacent substituents R 3 and R 4 between, adjacent substituents R 5 and R 4 between, adjacent substituents R 5 and R 6 between, adjacent substituents R 7 and R 6 between, adjacent substituents R 7 and R 8 between, any one or more of these substituent groups can be connected to form a ring. Obviously, these substituents can also not be connected to form a ring at all.

[0152] According to an embodiment of the present invention, wherein the metal complex Ir(L a ) m (L b ) 3-m has a structure represented by Formula 3A:

[0153]

[0154] X is selected from the group consisting of O, S, Se, NR', SiR'R', and GeRR'R'; when two R's are present simultaneously, the two R's are the same or different;

[0155] m is selected from 1, 2, or 3; when m is selected from 1, the two L b are the same or different; when m is selected from 2 or 3, the multiple L a are the same or different;

[0156] R x and R y each occurrence being the same or different represents mono-substitution, multi-substitution, or no substitution;

[0157] Ar has a structure represented by Formula 2:

[0158]

[0159] a is selected from 0, 1, 2, 3, 4, or 5;

[0160] R a1 and R a2 each occurrence being the same or different represents mono-substitution, multi-substitution, or no substitution;

[0161] ring Ar 1 and ring Ar2 each occurrence is the same as or different from an aromatic ring having 6 to 30 ring atoms, a heteroaromatic ring having 5 to 30 ring atoms, or a combination thereof; and the ring Ar 1 and the ring Ar 2 have a total number of ring atoms greater than or equal to 8;

[0162] * indicates the linking position of formula 2;

[0163] R', R x , R y , R 1 -R 8 , R a1 and R a2 each occurrence is the same as or different 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, substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, substituted or unsubstituted aralkyl 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 alkynyl 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 alkylgermyl having 3 to 20 carbon atoms, substituted or unsubstituted arylgermyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0164] adjacent substituents R', R x , R y , R a1 , R a2 can optionally be linked to form a ring;

[0165] adjacent substituents R 1 -R 8 can optionally be linked to form a ring.

[0166] According to one embodiment of the present invention, wherein X 1 -X 5 each occurrence is the same as or different from CR x .

[0167] According to one embodiment of the present invention, wherein Y1 -Y 4 the same or different each time it appears and selected from CR y 。

[0168] According to an embodiment of the present invention, wherein X 1 -X 5 at least one of which is N, for example X 1 -X 8 has one N or two Ns.

[0169] According to an embodiment of the present invention, wherein Y 1 -Y 4 at least one of which is N, for example Y 1 -Y 4 has one N or two Ns.

[0170] According to an embodiment of the present invention, wherein X is selected from O or S.

[0171] According to an embodiment of the present invention, wherein X is selected from O.

[0172] According to an embodiment of the present invention, wherein a is selected from 0, 1, 2 or 3.

[0173] According to an embodiment of the present invention, wherein a is selected from 1.

[0174] According to an embodiment of the present invention, wherein R a1 and R a2 the same or different each time it appears and selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, cyano, isocyano, hydroxyl, mercapto, and combinations thereof.

[0175] According to an embodiment of the present invention, wherein R a1 and R a2 the same or different each time it appears and selected from the group consisting of: hydrogen, deuterium, substituted or unsubstituted alkyl having 1-6 carbon atoms, substituted or unsubstituted cycloalkyl having 3-6 ring carbon atoms, substituted or unsubstituted aryl having 6-18 carbon atoms, substituted or unsubstituted heteroaryl having 3-18 carbon atoms, substituted or unsubstituted alkylsilyl having 3-15 carbon atoms, and combinations thereof.

[0176] According to one embodiment of the present invention, wherein R a1 and R a2 are each independently selected, each time they appear, from the group consisting of: hydrogen, deuterium, methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, tert-butyl, cyclopentyl, cyclohexyl, deuterated methyl, deuterated ethyl, deuterated propyl, deuterated isopropyl, deuterated n-butyl, deuterated isobutyl, deuterated tert-butyl, deuterated cyclopentyl, deuterated cyclohexyl, phenyl, pyridyl, trimethylsilyl, and combinations thereof.

[0177] According to one embodiment of the present invention, wherein in Ar, ring Ar 1 and ring Ar 2 are each independently selected, each time they appear, from aromatic rings having 6 - 18 ring atoms, heteroaromatic rings having 5 - 18 ring atoms, or combinations thereof; and the total number of ring atoms of ring Ar 1 and ring Ar 2 is greater than or equal to 8 and less than or equal to 30.

[0178] According to one embodiment of the present invention, in Ar, the total number of ring atoms of ring Ar 1 and ring Ar 2 is greater than or equal to 8 and less than or equal to 24.

[0179] According to one embodiment of the present invention, in Ar, the total number of ring atoms of ring Ar 1 and ring Ar 2 is greater than or equal to 8 and less than or equal to 18.

[0180] According to one embodiment of the present invention, in Ar, ring Ar 1 and ring Ar 2 are each independently selected, each time they appear, from aromatic rings having 6 ring atoms, heteroaromatic rings having 5 or 6 ring atoms, or combinations thereof.

[0181] According to one embodiment of the present invention, in Ar, ring Ar 1 and ring Ar 2 are each independently selected, each time they appear, from aromatic rings or heteroaromatic rings having 6 ring atoms.

[0182] According to one embodiment of the present invention, in Ar, ring Ar 1 and ring Ar 2 are each independently selected, each time they appear, from aromatic rings having 6 ring atoms.

[0183] According to one embodiment of the present invention, in Ar, ring Ar 1 and ring Ar 2Each occurrence is the same as or different from and is selected from the group consisting of: a benzene ring, a pyridine ring, a pyrimidine ring, a naphthalene ring, a triazine ring, a phenanthrene ring, an anthracene ring, a silafluorene ring, a quinoline ring, an isoquinoline ring, a benzofuran ring, a bithiophene ring, a bifuran ring, a benzothiophene ring, an indene ring, a dibenzofuran ring, a dibenzothiophene ring, a triphenylene ring, a carbazole ring, an azacarbazole ring, an azadibenzofuran ring, an azadibenzothiophene ring, an azasilafluorene ring, and combinations thereof; and the ring Ar 1 and the ring Ar 2 The total number of ring atoms of is greater than or equal to 8 and less than or equal to 30.

[0184] According to one embodiment of the present invention, wherein Ar is the same as or different from and is selected from the group consisting of:

[0185]

[0186]

[0187] and combinations thereof;

[0188] Optionally, the above groups may be partially or fully deuterated; wherein "*" represents the connection position of the Ar.

[0189] According to one embodiment of the present invention, wherein R x Each occurrence is the same as or different from and is selected from the group consisting of: hydrogen, deuterium, halogen, a substituted or unsubstituted alkyl group having 1-20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3-20 ring carbon atoms, a substituted or unsubstituted aryl group having 6-30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3-30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3-20 carbon atoms, a cyano group, and combinations thereof.

[0190] According to one embodiment of the present invention, wherein R x Each occurrence is the same as or different from and is selected from the group consisting of: hydrogen, deuterium, fluorine, a substituted or unsubstituted alkyl group having 1-6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3-6 ring carbon atoms, a substituted or unsubstituted aryl group having 6-12 carbon atoms, a substituted or unsubstituted heteroaryl group having 3-11 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3-6 carbon atoms, a cyano group, and combinations thereof.

[0191] According to one embodiment of the present invention, wherein the R xat least one is selected from the group consisting of: deuterium, a halogen, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a cyano group, and combinations thereof.

[0192] According to one embodiment of the present invention, wherein R x at least one is selected from the group consisting of: deuterium, fluorine, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 6 ring carbon atoms, a substituted or unsubstituted aryl group having 6 to 12 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 12 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 6 carbon atoms, a cyano group, and combinations thereof.

[0193] According to one embodiment of the present invention, wherein R x at least one is selected from the group consisting of: deuterium, fluorine, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 6 ring carbon atoms, a cyano group, and combinations thereof.

[0194] According to one embodiment of the present invention, wherein X 1 -X 5 at least one of which is selected from CR x , and said R x is a cyano group or fluorine.

[0195] According to one embodiment of the present invention, wherein X 3 -X 5 at least one of which is selected from CR x , and said R x is a cyano group or fluorine.

[0196] According to one embodiment of the present invention, wherein X 5 is CR x , and said R x is a cyano group or fluorine.

[0197] According to one embodiment of the present invention, wherein R y is the same or different each time it appears and is selected from the group consisting of: hydrogen, deuterium, a halogen, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, and combinations thereof.

[0198] According to one embodiment of the present invention, wherein R y is the same or different each time it appears and is selected from the group consisting of: hydrogen, deuterium, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 6 ring carbon atoms, a substituted or unsubstituted aryl group having 6 to 18 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 18 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 15 carbon atoms, and combinations thereof.

[0199] According to one embodiment of the present invention, wherein at least one R y is selected from the group consisting of: deuterium, halogen, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, and combinations thereof.

[0200] According to one embodiment of the present invention, wherein R 2 , R 3 , R 6 , R 7 at least one or at least two or at least three or all are selected from the group consisting of: deuterium, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, and combinations thereof.

[0201] According to one embodiment of the present invention, wherein R 2 , R 3 , R 6 , R 7 at least one or at least two or at least three or all are selected from the group consisting of: deuterium, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, and combinations thereof.

[0202] According to one embodiment of the present invention, wherein R 2 , R 3 , R 6 , R 7 at least one or at least two or at least three or all are selected from the group consisting of: deuterium, methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, tert-butyl, cyclopentyl, cyclohexyl, neopentyl, tert-pentyl, and combinations thereof; optionally, the hydrogen in the above groups is partially or completely deuterated.

[0203] According to one embodiment of the present invention, wherein R' is selected from substituted or unsubstituted alkyl having 1-20 carbon atoms, or substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms.

[0204] According to one embodiment of the present invention, wherein R' is methyl or deuterated methyl.

[0205] According to one embodiment of the present invention, wherein R 7 is the same or different each time it appears and is selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclic group having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl group, carbonyl group, carboxylic acid group, ester group, cyano group, isocyano group, hydroxyl group, mercapto group, sulfinyl group, sulfonyl group, phosphino group, and combinations thereof.

[0206] According to one embodiment of the present invention, wherein L a is the same or different each time it appears and is selected from the group consisting of L a1 to L a1177 wherein the specific structures of L a1 to L a1177 are shown as follows:

[0207]

[0208]

[0209]

[0210]

[0211]

[0212]

[0213]

[0214]

[0215]

[0216]

[0217]

[0218]

[0219]

[0220]

[0221]

[0222]

[0223]

[0224]

[0225]

[0226]

[0227]

[0228]

[0229]

[0230]

[0231]

[0232]

[0233]

[0234]

[0235]

[0236]

[0237]

[0238]

[0239]

[0240]

[0241]

[0242]

[0243]

[0244]

[0245]

[0246]

[0247]

[0248]

[0249]

[0250]

[0251]

[0252]

[0253]

[0254]

[0255]

[0256]

[0257]

[0258]

[0259]

[0260]

[0261] According to one embodiment of the present invention, wherein, L b is the same or different each time it appears and is selected from the group consisting of L b1 to L b128 wherein L b1 to L b128 has the following specific structure:

[0262]

[0263]

[0264]

[0265] According to one embodiment of the present invention, wherein, L c is the same or different each time and is selected from the group consisting of L c1 to L c360 wherein L c1 to L c360 has the following specific structure:

[0266]

[0267]

[0268]

[0269]

[0270]

[0271]

[0272]

[0273] According to one embodiment of the present invention, wherein the metal complex has the structure of Ir(L a ) 2 (L b ), L a is the same or different each time and is selected from any one or any two of the group consisting of L a1 to L a1177 , and L b is selected from any one of the group consisting of L b1 to L b128 .

[0274] According to one embodiment of the present invention, wherein the metal complex has the structure of Ir(L a )(L b ), 2 L a is the same or different each time and is selected from any one of the group consisting of L a1 to L a1177 , and L b is selected from any one or any two of the group consisting of L b1 to L b128 .

[0275] According to one embodiment of the present invention, wherein the metal complex has the structure of Ir(L a ), 3 L aEach occurrence is the same or different and is selected from any one or any two or any three of the group consisting of L a1 to L a1177 .

[0276] According to an embodiment of the present invention, wherein the metal complex has the structure of Ir(L a )(L 2 ), where L c Each occurrence is the same or different and is selected from any one or any two of the group consisting of L a to L a1 to L a1177 , and L c is selected from any one of the group consisting of L c1 to L c360 .

[0277] According to an embodiment of the present invention, wherein the metal complex has the structure of Ir(L a )(L c ), where L 2 Each occurrence is the same or different and is selected from any one of the group consisting of L a to L a1 to L a1177 , and L c is selected from any one or any two of the group consisting of L c1 to L c360 .

[0278] According to an embodiment of the present invention, wherein the metal complex has the structure of Ir(L a )(L b )(L c ), wherein L a Each occurrence is the same or different and is selected from any one of the group consisting of L a1 to L a1177 , L b is selected from any one of the group consisting of L b1 to L b128 , and L c is selected from any one of the group consisting of L c1 to L c360 .

[0279] According to an embodiment of the present invention, wherein the metal complex is selected from the group consisting of metal complexes 1 to 1008, wherein metal complexes 1 to 1008 have the structure of IrL a (L b ), where the two L 2 are the same, and wherein L b and L a and L b correspond to the structures represented in the following table respectively:

[0280]

[0281]

[0282]

[0283]

[0284]

[0285]

[0286]

[0287]

[0288]

[0289]

[0290]

[0291]

[0292]

[0293]

[0294] According to an embodiment of the present invention, an electroluminescent device is disclosed, which includes:

[0295] An anode,

[0296] A cathode,

[0297] And an organic layer disposed between the anode and the cathode, the organic layer containing the metal complex described in any of the foregoing embodiments.

[0298] According to an embodiment of the present invention, the organic layer containing the metal complex in the electroluminescent device is a light-emitting layer.

[0299] According to an embodiment of the present invention, the light-emitting layer of the electroluminescent device emits green light.

[0300] According to an embodiment of the present invention, the light-emitting layer of the electroluminescent device emits white light.

[0301] According to an embodiment of the present invention, the light-emitting layer of the electroluminescent device contains a first host compound.

[0302] According to an embodiment of the present invention, the light-emitting layer of the electroluminescent device contains a first host compound and a second host compound.

[0303] According to an embodiment of the present invention, at least one of the host compounds in the electroluminescent device contains at least one chemical group selected from the group consisting of benzene, pyridine, pyrimidine, triazine, carbazole, azacarbazole, indolocarbazole, dibenzothiophene, azadibenzothiophene, dibenzofuran, azadibenzofuran, dibenzoselenophene, triphenylene, azatriphenylene, fluorene, silafluorene, naphthalene, quinoline, isoquinoline, quinazoline, quinoxaline, phenanthrene, azaphenanthrene, and combinations thereof.

[0304] According to an embodiment of the present invention, the first host compound has a structure represented by Formula 4:

[0305]

[0306] Wherein,

[0307] E 1 -E 6 Each occurrence is the same or different and is selected from C, CR e or N, and E 1 -E 6 At least two of them are N, and E 1 -E 6 At least one of them is C and is connected to Formula A;

[0308]

[0309] Wherein,

[0310] Q is the same or different each occurrence and is selected from the group consisting of O, S, Se, N, NR”, CR”R”, SiR”R”, GeR”R” and R”C=CR”; when two R” are present simultaneously, the two R” can be the same or different;

[0311] p is 0 or 1; r is 0 or 1;

[0312] When Q is selected from N, p is 0 and r is 1;

[0313] When Q is selected from the group consisting of O, S, Se, NR”, CR”R”, SiR”R”, GeR”R” and R”C=CR”, p is 1 and r is 0;

[0314] L is the same or different each occurrence and is selected from a single bond, a substituted or unsubstituted alkylene having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkylene having 3 to 20 carbon atoms, a substituted or unsubstituted arylene having 6 to 20 carbon atoms, a substituted or unsubstituted heteroarylene having 3 to 20 carbon atoms, or a combination thereof;

[0315] Q 1 -Q 8 is the same or different each occurrence and is selected from C, CR q or N;

[0316] R e , R” and R q is the same or different each occurrence and is selected from the group consisting of: hydrogen, deuterium, halogen, a substituted or unsubstituted alkyl having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, a substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, a substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, a substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, a substituted or unsubstituted alkynyl having 2 to 20 carbon atoms, a substituted or unsubstituted aryl having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, a substituted or unsubstituted alkylgermyl having 3 to 20 carbon atoms, a substituted or unsubstituted arylgermyl having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0317] “*” represents the connecting position of Formula A and Formula 4;

[0318] Adjacent substituents R e , R”, R q can optionally be joined to form a ring.

[0319] As used herein, “adjacent substituents R e , R”, R q can optionally be joined to form a ring” is intended to mean that among adjacent substituent groups, for example, between two substituents R e , between two substituents R”, between two substituents R q , between two substituents R” and R qAmong them, any one or more of these substituent groups may be connected to form a ring. Obviously, none of these substituents may be connected to form a ring either.

[0320] According to one embodiment of the present invention, wherein, E 1 -E 6 is the same or different each time it appears and is selected from C, CR e or N, and in E 1 -E 6 three are N, and in E 1 -E 6 at least one is CR e and the R e is the same or different each time it appears and is selected from the group consisting of: substituted or unsubstituted aryl having 6 - 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 - 30 carbon atoms, and combinations thereof.

[0321] According to one embodiment of the present invention, wherein, E 1 -E 6 is the same or different each time it appears and is selected from C, CR e or N, and in E 1 -E 6 three are N, and in E 1 -E 6 at least one is CR e and the R e is the same or different each time it appears and is selected from the group consisting of: substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted terphenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted phenanthryl, substituted or unsubstituted triphenylene, substituted or unsubstituted fluorene, substituted or unsubstituted dibenzofuran, substituted or unsubstituted dibenzothiophene, substituted or unsubstituted carbazole, and combinations thereof.

[0322] According to one embodiment of the present invention, wherein Q is the same or different each time it appears and is selected from O, S, N or NR”.

[0323] According to one embodiment of the present invention, wherein, Q 1 -Q 8 at least one or at least two of them are selected from CR q and the R q is selected from substituted or unsubstituted aryl having 6 - 30 carbon atoms, substituted or unsubstituted heteroaryl having 5 - 30 carbon atoms, or combinations thereof.

[0324] According to one embodiment of the present invention, wherein, Q 1 -Q 8 at least one or at least two of them are selected from CR q, and the R q is selected from a substituted or unsubstituted phenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted terphenyl group, a substituted or unsubstituted pyridyl group, or a combination thereof.

[0325] According to one embodiment of the present invention, wherein L is the same or different each time it appears and is selected from a single bond, a substituted or unsubstituted arylene group having 6-20 carbon atoms, a substituted or unsubstituted heteroarylene group having 3-20 carbon atoms, or a combination thereof.

[0326] According to one embodiment of the present invention, wherein L is the same or different each time it appears and is selected from a single bond, a substituted or unsubstituted phenylene group, a substituted or unsubstituted biphenylene group, a substituted or unsubstituted carbazolylene group, a substituted or unsubstituted dibenzofuranylene group, a substituted or unsubstituted dibenzothiophenylene group, a substituted or unsubstituted fluorenylene group.

[0327] According to one embodiment of the present invention, wherein L is the same or different each time it appears and is selected from a single bond, a substituted or unsubstituted phenylene group, a substituted or unsubstituted biphenylene group.

[0328] According to one embodiment of the present invention, wherein the first host compound is selected from the group consisting of H-1 to H-243, and the specific structures of H-1 to H-243 are shown as follows:

[0329]

[0330]

[0331]

[0332]

[0333]

[0334]

[0335]

[0336]

[0337]

[0338]

[0339]

[0340]

[0341]

[0342]

[0343]

[0344]

[0345]

[0346]

[0347]

[0348] According to an embodiment of the present invention, the second host compound in the electroluminescent device has a structure represented by Formula 5:

[0349]

[0350] wherein,

[0351] L x is the same or different each time it appears and is selected from a single bond, a substituted or unsubstituted alkylene having 1-20 carbon atoms, a substituted or unsubstituted cycloalkylene having 3-20 carbon atoms, a substituted or unsubstituted arylene having 6-20 carbon atoms, a substituted or unsubstituted heteroarylene having 3-20 carbon atoms, or a combination thereof;

[0352] V is the same or different each time it appears and is selected from C, CR v or N, and at least one of V is C and is connected to L x ;

[0353] U is the same or different each time it appears and is selected from C, CR u or N, and at least one of U is C and is connected to L x ;

[0354] R v and R uEach occurrence is the same as or different from each other and is selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclic group having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted alkynyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermyl having 3-20 carbon atoms, substituted or unsubstituted arylgermyl having 6-20 carbon atoms, substituted or unsubstituted amino group having 0-20 carbon atoms, acyl group, carbonyl group, carboxyl group, ester group, cyano group, isocyano group, hydroxyl group, mercapto group, sulfinyl group, sulfonyl group, phosphino group, and combinations thereof;

[0355] Ar 6 Each occurrence is the same as or different from each other and is selected from substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, or combinations thereof;

[0356] Adjacent substituents R v and R u can optionally be connected to form a ring;

[0357] In this embodiment, "adjacent substituents R v and R u can optionally be connected to form a ring" is intended to mean that among adjacent substituent groups, for example, between two substituents R v between two substituents R u between two substituents R v and R u any one or more of these substituent groups can be connected to form a ring. Obviously, these substituents may also not be connected to form a ring with each other.

[0358] According to one embodiment of the present invention, the second host compound in the electroluminescent device has a structure represented by one of Formula 5-a to Formula 5-j:

[0360]

[0361]

[0362] Wherein,

[0363] L x is the same or different each time it appears and is selected from a single bond, a substituted or unsubstituted alkylene having 1 - 20 carbon atoms, a substituted or unsubstituted cycloalkylene having 3 - 20 carbon atoms, a substituted or unsubstituted arylene having 6 - 20 carbon atoms, a substituted or unsubstituted heteroarylene having 3 - 20 carbon atoms, or a combination thereof;

[0364] V is the same or different each time it appears and is selected from C, CR v or N, and at least one of V is C and is connected to L x ;

[0365] U is the same or different each time it appears and is selected from C, CR u or N, and at least one of U is C and is connected to L x ;

[0366] R v and R u are the same or different each time they appear and are selected from the group consisting of: hydrogen, deuterium, halogen, a substituted or unsubstituted alkyl having 1 - 20 carbon atoms, a substituted or unsubstituted cycloalkyl having 3 - 20 ring carbon atoms, a substituted or unsubstituted heteroalkyl having 1 - 20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3 - 20 ring atoms, a substituted or unsubstituted aralkyl having 7 - 30 carbon atoms, a substituted or unsubstituted alkoxy having 1 - 20 carbon atoms, a substituted or unsubstituted aryloxy having 6 - 30 carbon atoms, a substituted or unsubstituted alkenyl having 2 - 20 carbon atoms, a substituted or unsubstituted alkynyl having 2 - 20 carbon atoms, a substituted or unsubstituted aryl having 6 - 30 carbon atoms, a substituted or unsubstituted heteroaryl having 3 - 30 carbon atoms, a substituted or unsubstituted alkylsilyl having 3 - 20 carbon atoms, a substituted or unsubstituted arylsilyl having 6 - 20 carbon atoms, a substituted or unsubstituted alkylgermyl having 3 - 20 carbon atoms, a substituted or unsubstituted arylgermyl having 6 - 20 carbon atoms, a substituted or unsubstituted amino group having 0 - 20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0367] Ar 6 is the same or different each time it appears and is selected from a substituted or unsubstituted aryl having 6 - 30 carbon atoms, a substituted or unsubstituted heteroaryl having 3 - 30 carbon atoms, or a combination thereof;

[0368] Adjacent substituents R v and R u can optionally be connected to form a ring;

[0369] According to an embodiment of the present invention, the second host compound is selected from the group consisting of compounds X-1 to X-128, and the specific structures of compounds X-1 to X-128 are shown as follows:

[0370]

[0371]

[0372]

[0373]

[0374]

[0375]

[0376]

[0377]

[0378]

[0379]

[0380]

[0381] According to an embodiment of the present invention, in the electroluminescent device, the metal complex is doped in the first host compound and the second host compound, and the weight of the metal complex accounts for 1% to 30% of the total weight of the light-emitting layer.

[0382] According to an embodiment of the present invention, in the electroluminescent device, the metal complex is doped in the first host compound and the second host compound, and the weight of the metal complex accounts for 3% - 13% of the total weight of the light-emitting layer.

[0383] According to another embodiment of the present invention, a compound combination is disclosed, and the compound combination includes the metal complex described in any of the foregoing embodiments.

[0384] Combined with other materials

[0385] The materials for specific layers in the organic light-emitting devices described in the present invention can be used in combination with various other materials present in the devices. The combinations of these materials are described in detail in paragraphs 0132-0161 of US Patent Application US2016 / 0359122A1, the entire content of which is incorporated herein by reference. The materials described or mentioned therein are non-limiting examples of materials that can be used in combination with the compounds disclosed herein, and those skilled in the art can easily consult the literature to identify other materials that can be used in combination.

[0386] The materials described herein as being useful for specific layers in organic light-emitting devices can be used in combination with a variety of other materials present in the devices. For example, the luminescent dopants disclosed herein can be used in combination with a variety of hosts, transport layers, blocking layers, injection layers, electrodes, and other layers that may be present. The combinations of these materials are described in detail in paragraphs 0080-0101 of US Patent Application US2015 / 0349273A1, the entire content of which is incorporated herein by reference. The materials described or mentioned therein are non-limiting examples of materials that can be used in combination with the compounds disclosed herein, and those skilled in the art can easily consult the literature to identify other materials that can be used in combination.

[0387] In the examples of material synthesis, unless otherwise stated, all reactions were carried out under nitrogen protection. All reaction solvents were anhydrous and used as received from commercial sources. The synthesized products were structurally confirmed and characterized using one or more conventional devices in the art (including but not limited to nuclear magnetic resonance spectrometers from Bruker, liquid chromatographs, liquid chromatography-mass spectrometers, gas chromatography-mass spectrometers, differential scanning calorimeters from Shimadzu, fluorescence spectrophotometers from Shanghai Lingguang Technology, electrochemical workstations from Wuhan Koster, sublimators from Anhui Beike, etc.) by methods well-known to those skilled in the art. In the examples of devices, the characteristics of the devices were also tested using conventional devices in the art (including but not limited to evaporation coaters produced by AngstromEngineering, optical test systems, lifetime test systems produced by Suzhou FushiDa, ellipsometers produced by Beijing Liangtuo, etc.) by methods well-known to those skilled in the art. Since those skilled in the art are familiar with the use of the above-mentioned devices, testing methods, etc., and can obtain the inherent data of the samples determinately and without interference, the above-related content will not be elaborated further in this patent.

[0388] Examples of material synthesis:

[0389] The preparation method of the compounds of the present invention is not limited. Typically but not restrictively, the following compounds are taken as examples, and their synthetic routes and preparation methods are as follows:

[0390] Synthesis Example 1: Synthesis of Metal Complex 127

[0391] Step 1:

[0392]

[0393] In a dried 500 mL round-bottom flask, 5-methyl-2-phenylpyridine (10.0 g, 59.2 mmol), iridium(III) chloride trihydrate (5.0 g, 14.2 mmol), 300 mL of 2-ethoxyethanol, and 100 mL of water were successively added. The flask was purged with nitrogen three times and then protected by nitrogen. The mixture was heated with stirring at 130 °C for 24 h. After cooling, it was filtered, rinsed three times with methanol and n-hexane respectively, and then dried by suction to obtain 7.5 g of yellow solid intermediate 1 (97% yield).

[0394] Step 2:

[0395]

[0396] In a dried 500 mL round-bottom flask, intermediate 1 (7.5 g, 6.8 mmol), 250 mL of anhydrous dichloromethane, 10 mL of methanol, and silver trifluoromethanesulfonate (3.8 g, 14.8 mmol) were successively added. The flask was purged with nitrogen three times and then protected by nitrogen. The mixture was stirred overnight at room temperature. It was filtered through diatomaceous earth, rinsed twice with dichloromethane, the organic phase below was collected and concentrated under reduced pressure to obtain 9.2 g of intermediate 2 (93% yield).

[0397] Step 3:

[0398]

[0399] In a dried 500 mL round-bottom flask, intermediate 2 (1.3 g, 1.7 mmol), intermediate 3 (0.9 g, 2.3 mmol), and 250 mL of ethanol were successively added. The flask was purged with nitrogen three times and then protected by nitrogen. The mixture was heated and reacted at 100 °C for 18 h. After the reaction cooled down, it was filtered through diatomaceous earth. It was washed twice with methanol and n-hexane respectively. The yellow solid above the diatomaceous earth was dissolved in dichloromethane, the organic phase was collected, concentrated under reduced pressure, and purified by column chromatography to obtain 0.75 g of yellow solid product metal complex 127 (47.7% yield). The product was determined to be the target product with a molecular weight of 925.3.

[0400] Synthesis Example 2: Synthesis of Metal Complex 505

[0401] Step 1:

[0402]

[0403] In a dry 500 mL round-bottom flask, 5-tert-butyl-2-phenylpyridine (13.2 g, 62.9 mmol), iridium(III) chloride trihydrate (5.5 g, 15.7 mmol), 300 mL of 2-ethoxyethanol, and 100 mL of water were added successively. The mixture was purged with nitrogen three times and then protected by nitrogen. It was heated and stirred at 130 °C for 24 h. After cooling, it was filtered, rinsed three times with methanol and n-hexane respectively, and dried to obtain 9.7 g of intermediate 4 (97% yield).

[0404] Step 2:

[0405]

[0406] In a dry 500 mL round-bottom flask, intermediate 4 (9.7 g, 7.7 mmol), 250 mL of anhydrous dichloromethane, 10 mL of methanol, and silver trifluoromethanesulfonate (4.3 g, 16.7 mmol) were added successively. The mixture was purged with nitrogen three times and then protected by nitrogen. It was stirred overnight at room temperature. It was filtered through diatomaceous earth and rinsed twice with dichloromethane. The lower organic phase was collected and concentrated under reduced pressure to obtain 13.2 g of yellow solid intermediate 5 (93% yield).

[0407] Step 3:

[0408]

[0409] In a dry 500 mL round-bottom flask, intermediate 5 (1.4 g, 1.8 mmol), intermediate 3 (0.9 g, 2.2 mmol), and 300 mL of ethanol were added successively. The mixture was purged with nitrogen three times and then protected by nitrogen. It was heated and reacted at 100 °C for 24 h. After the reaction cooled, it was filtered through diatomaceous earth. It was washed twice with methanol and n-hexane respectively. The yellow solid above the diatomaceous earth was dissolved in dichloromethane. The organic phase was collected, concentrated under reduced pressure, and purified by column chromatography to obtain 0.75 g of yellow solid product metal complex 505 (41.3% yield). The product was determined to be the target product with a molecular weight of 1009.4.

[0410] Synthesis Example 3: Synthesis of Metal Complex 520

[0411] Step 1:

[0412]

[0413] In a 250 mL dry round-bottom flask, intermediate 6 (2.0 g, 4.9 mmol), intermediate 5 (2.7 g, 3.3 mmol), 50 mL of 2-ethoxyethanol and 50 mL of N,N-dimethylformamide were successively added. After purging with nitrogen three times and protecting with nitrogen, the reaction was heated at 100 °C for 96 h. After the reaction cooled, it was filtered through diatomaceous earth. It was washed twice with methanol and n-hexane respectively. The yellow solid above the diatomaceous earth was dissolved in dichloromethane, the organic phase was collected, concentrated under reduced pressure, and purified by column chromatography to obtain the yellow solid product metal complex 520 (1.74 g, 51.5% yield). The product was determined to be the target product with a molecular weight of 1023.4.

[0414] Synthesis Example 4: Synthesis of Metal Complex 532

[0415] Step 1:

[0416]

[0417] In a 500 mL dry round-bottom flask, intermediate 7 (1.8 g, 4.5 mmol), intermediate 5 (2.5 g, 3.0 mmol), and 300 mL of ethanol were successively added. After purging with nitrogen three times and protecting with nitrogen, the reaction was heated at 100 °C for 24 h. After the reaction cooled, it was filtered through diatomaceous earth. It was washed twice with methanol and n-hexane respectively. The yellow solid above the diatomaceous earth was dissolved in dichloromethane, the organic phase was collected, concentrated under reduced pressure, and purified by column chromatography to obtain the yellow solid product metal complex 532 (0.55 g, 18.2% yield). The product was determined to be the target product with a molecular weight of 1009.4.

[0418] Synthesis Example 5: Synthesis of Metal Complex 181

[0419] Step 1:

[0420]

[0421] In a 500 mL dry round-bottom flask, intermediate 2 (2.6 g, 3.5 mmol), intermediate 8 (2.2 g, 5.3 mmol), and 250 mL of ethanol were successively added. After purging with nitrogen three times and protecting with nitrogen, the reaction was heated at 100 °C for 18 h. After the reaction cooled, it was filtered through diatomaceous earth. It was washed twice with methanol and n-hexane respectively. The yellow solid above the diatomaceous earth was dissolved in dichloromethane, the organic phase was collected, concentrated under reduced pressure, and purified by column chromatography to obtain the yellow solid product metal complex 181 (1.1 g, 33.3% yield). The product was determined to be the target product with a molecular weight of 943.2.

[0422] Synthesis Example 6: Synthesis of Metal Complex 559

[0423] Step 1:

[0424]

[0425] In a dried 500 mL round-bottom flask, intermediate 5 (2.1 g, 2.6 mmol), intermediate 8 (1.5 g, 3.6 mmol), and 300 mL of ethanol were successively added. The flask was purged with nitrogen three times and then protected by nitrogen. The reaction was heated at 100 °C for 24 h. After the reaction cooled down, it was filtered through diatomaceous earth. The filter cake was washed twice with methanol and twice with n-hexane respectively. The yellow solid above the diatomaceous earth was dissolved in dichloromethane, and the organic phase was collected, concentrated under reduced pressure, and purified by column chromatography to obtain a yellow solid product, metal complex 559 (1.30 g, 48.7% yield). The product was confirmed to be the target product with a molecular weight of 1027.3.

[0426] Synthesis Example 7: Synthesis of Metal Complex 197

[0427] Step 1:

[0428]

[0429] In a dried 250 mL round-bottom flask, intermediate 2 (2.0 g, 2.8 mmol), intermediate 9 (1.8 g, 3.9 mmol), 50 mL of 2-ethoxyethanol, and 50 mL of N,N-dimethylformamide were successively added. The flask was purged with nitrogen three times and then protected by nitrogen. The reaction was heated at 100 °C for 72 h. After the reaction cooled down, it was filtered through diatomaceous earth. The filter cake was washed twice with methanol and twice with n-hexane respectively. The yellow solid above the diatomaceous earth was dissolved in dichloromethane, and the organic phase was collected, concentrated under reduced pressure, and purified by column chromatography to obtain a yellow solid product, metal complex 197 (1.2 g, 43.4% yield), which was a yellow solid. The product was confirmed to be the target product with a molecular weight of 1006.3.

[0430] Synthesis Example 8: Synthesis of Metal Complex 460

[0431] Step 1:

[0432]

[0433] 4-(Methyl-d 3 )-2-phenylpyridine-5-d (5.0 g, 28.9 mmol), iridium(III) chloride (2.6 g, 7.4 mmol), 2-ethoxyethanol (60 mL), and water (20 mL) were successively added to a dried 250 mL round-bottom flask. Under nitrogen protection, the mixture was heated to reflux and stirred for 24 h. After cooling, it was filtered under reduced pressure, and the filter cake was washed three times with methanol and three times with n-hexane respectively to obtain 4.0 g of a yellow solid intermediate 10 (94.8% yield).

[0434] Step 2:

[0435]

[0436] In a dry 500 mL round-bottom flask, successively add intermediate 10 (4.0 g, 3.5 mmol), anhydrous dichloromethane (250 mL), methanol (10 mL), silver trifluoromethanesulfonate (1.9 g, 7.6 mmol), displace the air with nitrogen three times and protect with nitrogen, and stir overnight at room temperature. Filter through diatomaceous earth, wash twice with dichloromethane, collect the lower organic phase and concentrate under reduced pressure to obtain 5.1 g of intermediate 11 (97.4% yield).

[0437] Step 3:

[0438]

[0439] In a dry 250 mL round-bottom flask, successively add intermediate 12 (1.5 g, 3.7 mmol), intermediate 11 (2.1 g, 2.2 mmol), 50 mL of N,N-dimethylformamide, 50 mL of 2-ethoxyethanol, N 2 Protect, heat to reflux, and react for 96 h. After the reaction is cooled, filter through diatomaceous earth. Wash twice with methanol and n-hexane respectively. Dissolve the yellow solid above the diatomaceous earth with dichloromethane, collect the organic phase, concentrate under reduced pressure, and purify by column chromatography to obtain the yellow solid product metal complex 460 (0.82 g, 40.0% yield). This product is determined to be the target product with a molecular weight of 932.3.

[0440] Synthesis Example 9: Synthesis of Metal Complex 571

[0441] Step 1:

[0442]

[0443] In a dry 250 mL round-bottom flask, successively add intermediate 13 (1.4 g, 1.7 mmol), intermediate 5 (1.0 g, 2.4 mmol), 50 mL each of 2-ethoxyethanol and N,N-dimethylformamide, displace the air with nitrogen three times and protect with nitrogen, and heat and react at 100 °C for 72 h. After the reaction is cooled, filter through diatomaceous earth. Wash twice with methanol and n-hexane respectively. Dissolve the yellow solid above the diatomaceous earth with dichloromethane, collect the organic phase, concentrate under reduced pressure, and purify by column chromatography to obtain the yellow solid product metal complex 571 (0.5 g, 28.4% yield). The product is determined to be the target product with a molecular weight of 1034.3.

[0444] Synthesis Example 10: Synthesis of Metal Complex 572

[0445] Step 1:

[0446]

[0447] In a dried 250 mL round-bottom flask, 5 (2.4 g, 2.9 mmol), 14 (1.5 g, 3.4 mmol), 50 mL of 2-ethoxyethanol and 50 mL of N,N-dimethylformamide were successively added. The flask was purged with nitrogen three times and protected with nitrogen, and then heated at 100 °C for reaction for 72 h. After the reaction cooled down, it was filtered through diatomaceous earth. It was washed twice with methanol and n-hexane respectively. The yellow solid above the diatomaceous earth was dissolved in dichloromethane, the organic phase was collected, concentrated under reduced pressure, and purified by column chromatography to obtain the yellow solid product metal complex 572 (0.7 g, 23.0% yield). The product was determined to be the target product with a molecular weight of 1048.4.

[0448] Synthesis Example 11: Synthesis of Metal Complex 579

[0449] Step 1:

[0450]

[0451] In a dried 250 mL round-bottom flask, 5 (2.2 g, 2.7 mmol), 15 (1.5 g, 3.6 mmol), 50 mL of 2-ethoxyethanol and 50 mL of N,N-dimethylformamide were successively added. The flask was purged with nitrogen three times and protected with nitrogen, and then heated at 100 °C for reaction for 72 h. After the reaction cooled down, it was filtered through diatomaceous earth. It was washed twice with methanol and n-hexane respectively. The yellow solid above the diatomaceous earth was dissolved in dichloromethane, the organic phase was collected, concentrated under reduced pressure, and purified by column chromatography to obtain the yellow solid product metal complex 579 (0.8 g, 30.7% yield). The product was determined to be the target product with a molecular weight of 1034.3.

[0452] Synthesis Example 12: Synthesis of Metal Complex 697

[0453] Step 1:

[0454]

[0455] In a dried 500 mL round-bottom flask, 5-neopentyl-2-phenylpyridine (13.4 g, 59.1 mmol), iridium(III) chloride trihydrate (5.2 g, 14.8 mmol), 300 mL of 2-ethoxyethanol and 100 mL of water were successively added. The flask was purged with nitrogen three times and protected with nitrogen, and then heated and stirred at 130 °C for 24 h. After cooling, it was filtered, rinsed three times with methanol and n-hexane respectively, and dried to obtain 8.5 g of intermediate 16 (88% yield).

[0456] Step 2:

[0457]

[0458] In a dry 500 mL round-bottom flask, intermediate 16 (9.7 g, 7.7 mmol), 250 mL of anhydrous dichloromethane, 10 mL of methanol, and silver trifluoromethanesulfonate (4.3 g, 16.7 mmol) were successively added. The flask was purged with nitrogen three times and protected with nitrogen, and stirred overnight at room temperature. The mixture was filtered through diatomaceous earth and rinsed twice with dichloromethane. The lower organic phase was collected and concentrated under reduced pressure to obtain 11.8 g of yellow solid intermediate 17 (100% yield).

[0459] Step 3:

[0460]

[0461] In a dry 250 mL round-bottom flask, intermediate 17 (2.0 g, 2.3 mmol), intermediate 13 (1.4 g, 3.2 mmol), 50 mL each of 2-ethoxyethanol and N,N-dimethylformamide were successively added. The flask was purged with nitrogen three times and protected with nitrogen, and heated at 100 °C for 72 h. After the reaction cooled, it was filtered through diatomaceous earth. It was washed twice with methanol and n-hexane respectively. The yellow solid above the diatomaceous earth was dissolved in dichloromethane, the organic phase was collected, concentrated under reduced pressure, and purified by column chromatography to obtain 0.8 g of yellow solid product metal complex 697 (32.7% yield). The product was confirmed to be the target product with a molecular weight of 1062.4.

[0462] Those skilled in the art should be aware that the above preparation method is only an exemplary example, and those skilled in the art can obtain other compound structures of the present invention by improving it.

[0463] Device Example 1-1

[0464] First, a glass substrate with an 80 nm thick indium tin oxide (ITO) anode was cleaned and then treated with oxygen plasma and UV ozone. After treatment, the substrate was dried in a glove box to remove moisture. Then the substrate was mounted on a substrate holder and loaded into a vacuum chamber. The organic layers specified below were deposited at a vacuum of about 10 -8Under the condition of the substrate, evaporation was sequentially carried out on the ITO anode by thermal vacuum evaporation at a rate of 0.2 - 2 Å / second. Compound HI was used as the hole injection layer (HIL). Compound HT was used as the hole transport layer (HTL). Compound X-4 was used as the electron blocking layer (EBL). Then, the metal complex 127 of the present invention was doped in compounds X-4 and H-91 and co-deposited as the emitting layer (EML). On the EML, compound H-1 was used as the hole blocking layer (HBL). On the HBL, compounds ET and lithium 8-hydroxyquinoline (Liq) were co-deposited as the electron transport layer (ETL). Finally, 1 nm thickness of lithium 8-hydroxyquinoline (Liq) was evaporated as the electron injection layer, and 120 nm of aluminum was evaporated as the cathode. Then, the device was transferred back to the glove box and encapsulated with a glass cover and a desiccant to complete the device.

[0465] Device Example 2-1

[0466] The implementation of Device Example 2-1 is the same as that of Device Example 1-1, except that the metal complex 505 of the present invention is used instead of the metal complex 127 of the present invention in the emitting layer.

[0467] Device Example 2-2

[0468] The implementation of Device Example 2-2 is the same as that of Device Example 1-1, except that the metal complex 520 of the present invention is used instead of the metal complex 127 of the present invention in the emitting layer.

[0469] Device Example 2-3

[0470] The implementation of Device Example 2-3 is the same as that of Device Example 1-1, except that the metal complex 532 of the present invention is used instead of the metal complex 127 of the present invention in the emitting layer.

[0471] Device Comparative Example 1-1

[0472] The implementation of Device Comparative Example 1-1 is the same as that of Device Example 1-1, except that compound GD1 is used instead of the metal complex 127 of the present invention in the emitting layer (EML).

[0473] Device Comparative Example 2-1

[0474] The implementation of Device Comparative Example 2-1 is the same as that of Device Example 1-1, except that compound GD2 is used instead of the metal complex 127 of the present invention in the emitting layer (EML).

[0475] Device Comparative Example 2-2

[0476] The implementation of Device Comparative Example 2-2 is the same as that of Device Example 1-1, except that compound GD3 is used instead of the metal complex 127 of the present invention in the emitting layer (EML).

[0477] Device Comparative Example 2-3

[0478] The implementation of Device Comparative Example 2-3 is the same as that of Device Example 1-1, except that compound GD4 is used to replace the metal complex 127 of the present invention in the light-emitting layer (EML).

[0479] Device Comparative Example 2-4

[0480] The implementation of Device Comparative Example 2-4 is the same as that of Device Example 1-1, except that compound GD5 is used to replace the metal complex 127 of the present invention in the light-emitting layer (EML).

[0481] The detailed device layer structures and thicknesses are shown in the following table. For the layers in which more than one material is used, they are doped with different compounds in the weight ratios as described.

[0482] Table 1 Device Structures of Example 1-1, 2-1 to 2-3 and Comparative Example 1-1, 2-1 to 2-4

[0483]

[0484]

[0485] The material structures used in the devices are shown as follows:

[0486]

[0487]

[0488] The IVL characteristics of the devices were measured. The CIE data of the devices were measured at 1000 cd / m 2 , the maximum emission wavelength λ max , full width at half maximum (FWHM), voltage (V), current efficiency (CE), power efficiency (PE). The external quantum efficiency (EQE) data were tested at a constant current of 15 mA / cm 2 . These data were recorded and shown in Table 2.

[0489] Table 2 Device Data of Example 1-1, 2-1 to 2-3 and Comparative Example 1-1, 2-1 to 2-4

[0490]

[0491]

[0492] Discussion:

[0493] Table 2 shows the device performances of the examples and comparative examples. Comparing Example 1-1 with Comparative Example 1-1, and Examples 2-1 to 2-3 with Comparative Example 2-1, the difference lies in that the specific Ar substituents of the metal complexes are replaced by phenyl groups. When the full width at half maximum and the maximum emission wavelength are comparable and the driving voltage is slightly reduced, the CE, PE, and EQE of the devices are significantly improved. Comparing Example 1-1 with Comparative Example 1-1, the EQE is increased by about 8.3%, the PE is increased by about 8.6%, and the CE is increased by about 7.4%. Comparing Examples 2-1 to 2-3 with Comparative Example 2-1, the EQE is increased by about 10.2%, 8.2%, and 6.7% respectively, the PE is increased by 14.7%, 16.8%, and 10.5% respectively, and the CE is increased by 9.6%, 7.4%, and 5.3% respectively. This shows that the metal complexes of the present invention with specific Ar substituents replaced by phenyl groups are superior to the comparative examples in multiple device performances and can significantly improve the comprehensive performance of the devices.

[0494] Metal complexes GD3, GD4, and GD5 with specific Ar substitutions at other positions were synthesized for comparison, namely Comparative Examples 2-2 to 2-4. Comparing Example 2-1 with Comparative Examples 2-2 to 2-4, the difference lies in the L a biphenyl groups of the ligand at different substitution sites. When the driving voltages are comparable, the CE, PE, and EQE of the devices are significantly improved. Comparing Example 2-1 with Comparative Examples 2-2 to 2-4, the EQE is increased by 12.5%, 29.7%, and 21.7% respectively; the PE is increased by 10.1%, 37.9%, and 23.8% respectively; the CE is increased by 7.2%, 32%, and 22.6% respectively. This shows that the metal complexes of the L a ligand with specific Ar substituents at specific positions of the present invention are superior to the complexes of the comparative examples in multiple device performances and can significantly improve the comprehensive performance of the devices. The advantages of introducing specific substituents at specific positions observed in the compounds of the present invention are completely unexpected. It is impossible to predict such a situation even for those skilled in the art.

[0495] Device Example 3-1

[0496] The implementation of Device Example 3-1 is the same as that of Device Example 1-1, except that in the light-emitting layer, Metal Complex 181 of the present invention is used instead of Metal Complex 127 of the present invention.

[0497] Device Example 3-2

[0498] The implementation of Device Example 3-2 is the same as that of Device Example 1-1, except that in the light-emitting layer, Metal Complex 559 of the present invention is used instead of Metal Complex 127 of the present invention.

[0499] Device Example 4-1

[0500] The implementation of Device Example 4-1 is the same as that of Device Example 1-1, except that in the light-emitting layer, Metal Complex 197 of the present invention is used instead of Metal Complex 127 of the present invention.

[0501] Device Example 4-2

[0502] The implementation of Device Example 4-2 is the same as that of Device Example 1-1, except that in the light-emitting layer, Metal Complex 460 of the present invention is used instead of Metal Complex 127 of the present invention.

[0503] Device Example 4-3

[0504] The implementation of Device Example 4-3 is the same as that of Device Example 1-1, except that in the light-emitting layer, Metal Complex 571 of the present invention is used instead of Metal Complex 127 of the present invention.

[0505] Device Example 4-4

[0506] The implementation of Device Example 4-4 is the same as that of Device Example 1-1, except that in the light-emitting layer, Metal Complex 572 of the present invention is used instead of Metal Complex 127 of the present invention.

[0507] Device Example 4-5

[0508] The implementation of Device Example 4-5 is the same as that of Device Example 1-1, except that in the light-emitting layer, Metal Complex 579 of the present invention is used instead of Metal Complex 127 of the present invention.

[0509] Device Example 4-6

[0510] The implementation of Device Example 4-6 is the same as that of Device Example 1-1, except that in the light-emitting layer, Metal Complex 697 of the present invention is used instead of Metal Complex 127 of the present invention.

[0511] The detailed device layer structures and thicknesses are shown in the following table. For the layers where more than one material is used, they are obtained by doping different compounds in the recorded weight ratios.

[0512] Table 3 Device Structures of Examples 3-1 to 3-2 and 4-1 to 4-6

[0513]

[0514] The structures of the newly used materials in the device are shown as follows:

[0515]

[0516] The IVL characteristics of the device were measured. The CIE data of the device were measured at 1000 cd / m 2 and the maximum emission wavelength λ max, full width at half maximum (FWHM), voltage (V), current efficiency (CE), power efficiency (PE). The external quantum efficiency (EQE) data was tested at a constant current of 15 mA / cm 2 and these data were recorded and presented in Table 4.

[0517] Table 4 Device data of Examples 3-1 to 3-2 and 4-1 to 4-6

[0518]

[0519]

[0520] Discussion:

[0521] Table 4 shows the device performance of Examples 3-1 to 3-2 and 4-1 to 4-6 of the present invention. The metal complexes of Examples 3-1 to 3-2 have further fluorine substitution in addition to having specific Ar substituents at specific positions of the L a ligand, and the EQE, CE and PE are all slightly improved compared with Examples 1-1 and 2-1 without fluorine substitution.

[0522] Meanwhile, the metal complexes of Examples 4-1 to 4-6 have further cyano substitution in addition to having specific Ar substituents at specific positions of the L a ligand, and all show further significant improvements compared with Examples 1-1, 2-1 to 2-3 without cyano substitution. For example, the driving voltage is significantly reduced, and the narrowing range of the full width at half maximum is between 21.7 nm and 26.9 nm. At the maximum emission wavelength λ max being comparable, the narrowing of the full width at half maximum is beneficial to obtaining more saturated luminescence. The EQE can all reach a level greater than 24%, especially 26.35% for Example 4-1.

[0523] The above results show that the metal complex of the present invention containing specific Ar substitution at a specific position of the L a ligand further has at least one substituent on the L a ligand, such as fluorine or cyano substitution, and is superior to the complexes of the comparative examples in many device performances, can significantly improve the comprehensive performance of the device, and the device performance can be further improved compared with the metal complexes only containing specific Ar substitution.

[0524] Meanwhile, using the metal complex 505 of the present invention as the light-emitting dopant, it was paired with the first host compounds with different structures and applied to the light-emitting layer of the organic electroluminescent device, and the devices of Device Examples 5-1 to 5-5 were prepared and their performances were characterized.

[0525] Device Example 5-1

[0526] The implementation of Device Example 5-1 is the same as that of Device Example 2-1, except that the ratio of Compound X-4, Compound H-91, and Metal Complex 505 in the light-emitting layer is 66:28:6.

[0527] Device Example 5-2

[0528] The implementation of Device Example 5-2 is the same as that of Device Example 5-1, except that Compound H-1 is used instead of H-91 in the light-emitting layer.

[0529] Device Example 5-3

[0530] The implementation of Device Example 5-3 is the same as that of Device Example 5-1, except that Compound H-141 is used instead of H-91 in the light-emitting layer.

[0531] Device Example 5-4

[0532] The implementation of Device Example 5-4 is the same as that of Device Example 5-1, except that Compound H-171 is used instead of H-91 in the light-emitting layer.

[0533] Device Example 5-5

[0534] The implementation of Device Example 5-5 is the same as that of Device Example 5-1, except that Compound H-172 is used instead of H-91 in the light-emitting layer.

[0535] The detailed device layer structures and thicknesses are shown in the following table. For the layers with more than one material used, they are doped with different compounds in the recorded weight ratios.

[0536] Table 5 Device Structures of Device Examples 5-1 to 5-5

[0537]

[0538]

[0539] The structures of the newly used materials in the device are as follows:

[0540]

[0541] The IVL characteristics of the device were measured. The CIE data of the device were measured at 1000 cd / m 2 , the maximum emission wavelength λ max , full width at half maximum (FWHM), voltage (V), current efficiency (CE), power efficiency (PE). The external quantum efficiency (EQE) data were tested at a constant current of 15 mA / cm 2 . These data were recorded and shown in Table 6.

[0542] Device data of Device Examples 5-1 to 5-5

[0543]

[0544] As can be seen from the above data, Examples 5-1 to 5-5 are comparable in performance to Example 2-1, and their EQEs are all around 24%. In particular, the EQE of Example 5-2 reaches 25.03%. The above shows that in the case of the metal complex of the present invention with a specific Ar-substituted L a ligand can be used as a luminescent material in the light-emitting layer of an electroluminescent device, and excellent device performance can be achieved when it is combined with host materials of different structures.

[0545] In summary, the metal complex of the present invention containing an L a ligand with a specific Ar substitution at a specific position shows more excellent performance in the device compared to existing metal complexes with Ar substituents at other substitution positions in the La ligand. It can reduce the driving voltage and improve the device efficiency, especially the improvement of EQE, and ultimately significantly improve the comprehensive performance of the device. The advantages observed for the compounds of the present invention are completely unexpected, and it is impossible to predict such a situation even for those skilled in the art.

[0546] It should be understood that the various embodiments described herein are only examples and are not intended to limit the scope of the present invention. Therefore, as will be apparent to those skilled in the art, the claimed invention may include variations of the specific and preferred embodiments described herein. Many of the materials and structures described herein may be replaced with other materials and structures without departing from the spirit of the present invention. It should be understood that the various theories as to why the present invention works are not intended to be limiting.

Claims

1. An electroluminescent device, which comprises: An anode, a cathode, and an organic layer disposed between the anode and the cathode, the organic layer containing a metal complex, the metal complex comprising a metal M and a ligand L coordinated to the metal M a , wherein L a has a structure represented by Formula 1: In Formula 1, the metal M is selected from metals with a relative atomic mass greater than 40; Cy is the same or different each time it appears and is selected from a substituted or unsubstituted aromatic ring having 6 - 24 ring atoms, a substituted or unsubstituted heteroaromatic ring having 5 - 24 ring atoms, or a combination thereof; X is selected from the group consisting of O, S, Se, NR’, SiR’R’ and GeR’R’; when two R’s are present simultaneously, the two R’s are the same or different; X 1 -X 5 each occurrence independently selected from CR x or N; Ar has the structure represented by Formula 2: a is selected from 0, 1, 2, 3, 4 or 5; R a1 and R a2 each occurrence independently represents mono-substituted, poly-substituted or unsubstituted, identically or differently; Ring Ar 1 and Ring Ar 2 are each independently selected, each time they appear, from an aromatic ring having 6 to 30 ring atoms, a heteroaromatic ring having 5 to 30 ring atoms, or a combination thereof; and the total number of ring atoms of Ring Ar 1 and Ring Ar 2 is greater than or equal to 8; R’, R x , R a1 and R a2 each occurrence is independently 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, substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, substituted or unsubstituted aralkyl 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 alkynyl 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 alkylgermyl having 3 to 20 carbon atoms, substituted or unsubstituted arylgermyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxy, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof; "*" represents the connection position of Formula 2; Adjacent substituents R', R x , R a1 , R a2 can optionally be linked to form a ring.

2. The electroluminescent device according to claim 1, wherein, Cy is selected from any one of the structures consisting of: where R is the same or different each time it appears and represents single substitution, multiple substitution, or no substitution; when there are multiple R’s in any one structure, the R’s are the same or different; R is the same or different each time it appears and is selected from the group consisting of: hydrogen, deuterium, halogen, a substituted or unsubstituted alkyl having 1 - 20 carbon atoms, a substituted or unsubstituted cycloalkyl having 3 - 20 ring carbon atoms, a substituted or unsubstituted heteroalkyl having 1 - 20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3 - 20 ring atoms, a substituted or unsubstituted aralkyl having 7 - 30 carbon atoms, a substituted or unsubstituted alkoxy having 1 - 20 carbon atoms, a substituted or unsubstituted aryloxy having 6 - 30 carbon atoms, a substituted or unsubstituted alkenyl having 2 - 20 carbon atoms, a substituted or unsubstituted alkynyl having 2 - 20 carbon atoms, a substituted or unsubstituted aryl having 6 - 30 carbon atoms, a substituted or unsubstituted heteroaryl having 3 - 30 carbon atoms, a substituted or unsubstituted alkylsilyl having 3 - 20 carbon atoms, a substituted or unsubstituted arylsilyl having 6 - 20 carbon atoms, a substituted or unsubstituted alkylgermyl having 3 - 20 carbon atoms, a substituted or unsubstituted arylgermyl having 6 - 20 carbon atoms, a substituted or unsubstituted amino group having 0 - 20 carbon atoms, acyl group, carbonyl group, carboxyl group, ester group, cyano group, isocyano group, hydroxyl group, mercapto group, sulfinyl group, sulfonyl group, phosphino group, and combinations thereof; adjacent substituents R can optionally be connected to form a ring; Among them, '#' represents the position connected to metal M. represents the connection with X 1 , X 2 , X 3 or X 4 connection position.

3. The electroluminescent device according to claim 1 or 2, wherein, The metal complex has the general formula M(L a ) m (L b ) n (L c ) q ; wherein, M is the same or different each time it appears and is selected from the group consisting of Cu, Ag, Au, Ru, Rh, Pd, Os, Ir and Pt; preferably, M is the same or different each time it appears and is selected from Pt or Ir; L a 、 L b and L c are the first, second, and third ligands coordinated to the metal M, respectively, and L c and said L a or L b are the same or different; wherein, L a 、 L b and L c can optionally be linked to form a polydentate ligand; m is selected from 1, 2 or 3, n is selected from 0, 1 or 2, q is selected from 0, 1 or 2, and m + n + q is equal to the oxidation state of metal M; when m is greater than or equal to 2, a plurality of Ls a are the same or different; when n is equal to 2, two Ls b are the same or different; when q is equal to 2, two Ls c are the same or different; L a the same or different each occurrence and selected from the group consisting of: X is selected from the group consisting of O, S, Se, NR’, SiR’R’ and GeR’R’; when two R’s are present simultaneously, the two R’s are the same or different; Ar has the structure represented by Formula 2: a is selected from 0, 1, 2, 3, 4 or 5; Ring Ar 1 and Ring Ar 2 each occurrence is the same or different and is selected from an aromatic ring having 6 - 30 ring atoms, a heteroaromatic ring having 5 - 30 ring atoms, or a combination thereof; and the total number of ring atoms of Ring Ar 1 and Ring Ar 2 is greater than or equal to 8; "*" represents the connection position of Formula 2; R, R x , R a1 and R a2 each independently represents, when it appears, mono-substitution, poly-substitution, or no substitution; L b and L c each time it appears, is the same as or different from any one of the structures shown in the group consisting of the following: wherein, X b each occurrence is independently selected from the group consisting of O, S, Se, NR N1 , CR C1 R C2 ; R a and R b each independently represents, when it appears, mono-substitution, poly-substitution, or no substitution; R, R’, R x , R a , R b , R c , R N1 , R C1 , R C2 , R a1 and R a2 each occurrence is independently selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclic group having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted alkynyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermyl having 3-20 carbon atoms, substituted or unsubstituted arylgermyl having 6-20 carbon atoms, substituted or unsubstituted amino group having 0-20 carbon atoms, acyl group, carbonyl group, carboxyl group, ester group, cyano group, isocyano group, hydroxyl group, mercapto group, sulfinyl group, sulfonyl group, phosphino group, and combinations thereof; Adjacent substituents R, R', R x , R a1 and R a2 may optionally be linked to form a ring; Adjacent substituents R a ,R b ,R c ,R N1 ,R C1 ,R C2 may optionally be linked to form a ring.

4. The electroluminescent device according to claim 1, wherein, Metal complex Ir(L a ) m (L b ) 3-m has a structure represented by Formula 3: wherein, X is selected from the group consisting of O, S, Se, NR’, SiR’R’ and GeR’R’; when two R’s are present simultaneously, the two R’s are the same or different; m is selected from 1, 2 or 3; when m is selected from 1, the two Ls b are the same or different; when m is selected from 2 or 3, the multiple Ls a are the same or different; Y 1 -Y 4 each occurrence is independently selected from CR y or N; X 1 -X 5 each occurrence independently selected from CR x or N; Ar has the structure represented by Formula 2: a is selected from 0, 1, 2, 3, 4 or 5; R a1 and R a2 Each occurrence, which may be the same or different, represents mono-substitution, multi-substitution or no substitution; Ring Ar 1 and Ring Ar 2 are each independently selected, each time they appear, from an aromatic ring having 6 to 30 ring atoms, a heteroaromatic ring having 5 to 30 ring atoms, or a combination thereof; and the total number of ring atoms of Ring Ar 1 and Ring Ar 2 is greater than or equal to 8; R’, R x , R y , R 1 -R 8 , R a1 and R a2 each occurrence is independently selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclic group having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted alkynyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermyl having 3-20 carbon atoms, substituted or unsubstituted arylgermyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof; "*" represents the connection position of Formula 2; Adjacent substituents R', R x , R y , R a1 , R a2 can optionally be linked to form a ring; Adjacent substituents R 1 -R 8 can optionally be linked to form a ring.

5. The electroluminescent device according to claim 1 or 4, wherein, X 1 -X 5 the same or different each time it appears and selected from CR x , and / or Y 1 -Y 4 the same or different each time it appears and selected from CR y .

6. The electroluminescent device according to claim 1 or 4, wherein, X 1 -X 5 at least one of them is N, and / or Y 1 -Y 4 at least one of them is N.

7. The electroluminescent device according to any one of claims 1-6, wherein, X is selected from O or S, a is selected from 0, 1, 2 or 3; preferably, a is 1.

8. The electroluminescent device according to any one of claims 1-7, wherein, R a1 and R a2 each occurrence is the same as or different from and is independently 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 aralkyl having 7 to 30 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, cyano, isocyano, hydroxy, mercapto, and combinations thereof; Preferably, R a1 and R a2 are each independently selected, each time they appear, from the group consisting of hydrogen, deuterium, substituted or unsubstituted alkyl having 1 to 6 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 6 ring carbon atoms, substituted or unsubstituted aryl having 6 to 18 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 18 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 15 carbon atoms, and combinations thereof; More preferably, R a1 and R a2 are each independently selected, each time they appear, from the group consisting of hydrogen, deuterium, methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, tert-butyl, cyclopentyl, cyclohexyl, deuterated methyl, deuterated ethyl, deuterated propyl, deuterated isopropyl, deuterated n-butyl, deuterated isobutyl, deuterated tert-butyl, deuterated cyclopentyl, deuterated cyclohexyl, phenyl, pyridyl, trimethylsilyl, and combinations thereof.

9. The electroluminescent device according to any one of claims 1-8, in Ar, ring Ar 1 and ring Ar 2 are each independently selected from an aromatic ring having 6-18 ring atoms, a heteroaromatic ring having 5-18 ring atoms, or a combination thereof; and the total number of ring atoms of ring Ar 1 and ring Ar 2 is greater than or equal to 8 and less than or equal to 30; Preferably, in Ar, ring Ar 1 and ring Ar 2 are each independently selected, each time they appear, from the group consisting of: benzene ring, pyridine ring, pyrimidine ring, naphthalene ring, triazine ring, phenanthrene ring, anthracene ring, silafluorene ring, quinoline ring, isoquinoline ring, benzofuran ring, bithiophene ring, bifuran ring, benzothiophene ring, indene ring, dibenzofuran ring, dibenzothiophene ring, triphenylene ring, carbazole ring, azacarbazole ring, azadibenzofuran ring, azadibenzothiophene ring, azasilafluorene ring, and combinations thereof; and the total number of ring atoms of ring Ar 1 and ring Ar 2 is greater than or equal to 8 and less than or equal to 30.

10. The electroluminescent device according to any one of claims 1-8, in Ar, ring Ar 1 and ring Ar 2 each occurrence is independently selected from an aromatic ring having 6 ring atoms, a heteroaromatic ring having 5 or 6 ring atoms, or a combination thereof; Preferably, ring Ar 1 and ring Ar 2 are each independently selected from an aromatic or heteroaromatic ring having 6 ring atoms; More preferably, ring Ar 1 and ring Ar 2 each occurrence is independently selected from aromatic rings having 6 ring atoms.

11. The electroluminescent device according to any one of claims 1-8, wherein, Ar is the same or different each time it appears and is selected from the group consisting of: and combinations thereof; Optionally, the above groups may be partially or fully deuterated; wherein "*" represents the connection position of the Ar.

12. The electroluminescent device according to any one of claims 1-11, wherein, R x each occurrence independently 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 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, cyano, and combinations thereof; Preferably, R x is at least one selected from the group consisting of deuterium, fluorine, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 6 ring carbon atoms, a substituted or unsubstituted aryl group having 6 to 12 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 12 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 6 carbon atoms, a cyano group, and combinations thereof; More preferably, R x is at least one selected from the group consisting of deuterium, fluorine, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 6 ring carbon atoms, a cyano group, and combinations thereof.

13. The electroluminescent device according to any one of claims 1-12, wherein, X 1 -X 5 at least one of which is selected from CR x and said R x is cyano or fluoro; Preferably, X 3 -X 5 at least one of which is selected from CR x , and the R x is cyano or fluorine; More preferably, X 5 is CR x , and the R x is cyano or fluoro.

14. The electroluminescent device according to claim 4, wherein, R y Each occurrence is the same as or different from and is selected from the group consisting of hydrogen, deuterium, a halogen, a substituted or unsubstituted alkyl having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, a substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, a substituted or unsubstituted aryl having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, and combinations thereof; Preferably, at least one R y is selected from the group consisting of 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 aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, and combinations thereof.

15. The electroluminescent device according to claim 4, wherein, R 2 ,R 3 ,R 6 ,R 7 at least one or at least two or at least three or all of which are selected from the group consisting of: deuterium, a substituted or unsubstituted alkyl group having 1-20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3-20 ring carbon atoms, a substituted or unsubstituted aryl group having 6-30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3-30 carbon atoms, and combinations thereof; Preferably, R 2 , R 3 , R 6 , R 7 at least one or at least two or at least three or all of them are selected from the group consisting of: deuterium, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, and combinations thereof; More preferably, R 2 , R 3 , R 6 , R 7 at least one or at least two or at least three or all of them are selected from the group consisting of: deuterium, methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, tert-butyl, cyclopentyl, cyclohexyl, neopentyl, tert-pentyl, and combinations thereof; optionally, the hydrogen in the above groups can be partially or completely deuterated.

16. The electroluminescent device according to any one of claims 1-15, wherein, The organic layer containing the metal complex is a light-emitting layer.

17. The electroluminescent device according to claim 16, wherein, The electroluminescent device emits green light or white light.

18. The electroluminescent device according to claim 16, wherein, The light-emitting layer contains a first host compound; Preferably, the light-emitting layer further contains a second host compound; More preferably, the first host compound and / or the second host compound contains at least one chemical group selected from the group consisting of: benzene, pyridine, pyrimidine, triazine, carbazole, azacarbazole, indolocarbazole, dibenzothiophene, azadibenzothiophene, dibenzofuran, azadibenzofuran, dibenzoselenophene, triphenylene, azatriphenylene, fluorene, silafluorene, naphthalene, quinoline, isoquinoline, quinazoline, quinoxaline, phenanthrene, azaphenanthrene, and combinations thereof.

19. The electroluminescent device according to claim 18, wherein, The first host compound has the structure represented by Formula 4: wherein, E 1 -E 6 each occurrence is independently selected from C, CR e or N, and at least two of E 1 -E 6 are N, and at least one of E 1 -E 6 is C and is attached to formula A; wherein, Q is the same or different each time it appears and is selected from the group consisting of O, S, Se, N, NR", CR"R", SiR"R", GeR"R" and R"C=CR"; when two R" are present simultaneously, the two R" may be the same or different; p is 0 or 1; r is 0 or 1; When Q is selected from N, p is 0 and r is 1; When Q is selected from the group consisting of O, S, Se, NR", CR"R", SiR"R", GeR"R" and R"C=CR", p is 1 and r is 0; L is the same or different each time it appears and is selected from a single bond, a substituted or unsubstituted alkylene having 1-20 carbon atoms, a substituted or unsubstituted cycloalkylene having 3-20 carbon atoms, a substituted or unsubstituted arylene having 6-20 carbon atoms, a substituted or unsubstituted heteroarylene having 3-20 carbon atoms, or a combination thereof; Q 1 -Q 8 each independently selected from C, CR q or N; R e ,R'', and R q each occurrence is the same as or different from each other and is independently 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, substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, substituted or unsubstituted aralkyl 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 alkynyl 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 alkylgermyl having 3 to 20 carbon atoms, substituted or unsubstituted arylgermyl having 6 to 20 carbon atoms, substituted or unsubstituted amino group having 0 to 20 carbon atoms, acyl group, carbonyl group, carboxyl group, ester group, cyano group, isocyano group, hydroxyl group, mercapto group, sulfinyl group, sulfonyl group, phosphino group, and combinations thereof; "*" represents the connection position of Formula A and Formula 4; Adjacent substituents R e , R”, R q can optionally be joined to form a ring.

20. The electroluminescent device according to claim 19, wherein E 1 -E 6 is the same as or different from each occurrence and is selected from C, CR e or N, and E 1 -E 6 has three Ns, E 1 -E 6 has at least one CR e , and the R e is the same as or different from each occurrence and is selected from the group consisting of: 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 Q is the same as or different from each other each time it appears and is selected from O, S, N or NR″; and / or Q 1 -Q 8 at least one or at least two selected from CR q and said R q is selected from substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 5 to 30 carbon atoms, or a combination thereof; and / or L is the same as or different from each other each time it appears and is selected from a single bond, a substituted or unsubstituted arylene having 6-20 carbon atoms, a substituted or unsubstituted heteroarylene having 3-20 carbon atoms, or a combination thereof.

21. The electroluminescent device according to claim 18, wherein, the second host compound has a structure represented by Formula 5: wherein, L x each independently selected, each time it appears, from a single bond, a substituted or unsubstituted alkylene having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkylene having 3 to 20 carbon atoms, a substituted or unsubstituted arylene having 6 to 20 carbon atoms, a substituted or unsubstituted heteroarylene having 3 to 20 carbon atoms, or a combination thereof; V is the same as or different from each other every time it appears, and is selected from C, CR v or N, and at least one of V is C and is connected to L x connected; U is the same as or different from each other each time it appears, and is selected from C, CR u or N, and at least one of U is C and is connected to L x connected; R v and R u each occurrence is the same as or different from each other and is independently 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, substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, substituted or unsubstituted aralkyl 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 alkynyl 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 alkylgermyl having 3 to 20 carbon atoms, substituted or unsubstituted arylgermyl having 6 to 20 carbon atoms, substituted or unsubstituted amino group having 0 to 20 carbon atoms, acyl group, carbonyl group, carboxyl group, ester group, cyano group, isocyano group, hydroxyl group, mercapto group, sulfinyl group, sulfonyl group, phosphino group, and combinations thereof; Ar 6 each occurrence being the same or different and independently selected from a substituted or unsubstituted aryl having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, or a combination thereof; Adjacent substituents R v and R u can optionally be linked to form a ring; preferably, the second host compound has a structure represented by one of Formula 5-a to Formula 5-j:

22. The electroluminescent device according to claim 18, wherein the metal complex is doped in the first host compound and the second host compound, and the weight of the metal complex accounts for 1% to 30% of the total weight of the light-emitting layer; preferably, the weight of the metal complex accounts for 3% - 13% of the total weight of the light-emitting layer.

23. A consumer product, which comprises: the electroluminescent device according to any one of claims 1-15.

24. A luminescent material comprising a metal complex, the metal complex comprising a metal M and a ligand L coordinated to the metal M a , wherein L a has a structure represented by Formula 1: In Formula 1, metal M is selected from metals having a relative atomic mass greater than 40; Cy is the same as or different from each other each time it appears and is selected from a substituted or unsubstituted aromatic ring having 6-24 ring atoms, a substituted or unsubstituted heteroaromatic ring having 5-24 ring atoms, or a combination thereof; X is selected from the group consisting of O, S, Se, NR′, SiR′R′ and GeR′R′; when two R′ are present simultaneously, the two R′ are the same or different; X 1 -X 5 each occurrence being the same as or different from, independently selected from CR x or N; Ar has a structure represented by Formula 2: a is selected from 0, 1, 2, 3, 4 or 5; R a1 and R a2 each occurrence independently represents unsubstituted, mono-substituted, or poly-substituted, either the same or different each time it appears; Ring Ar 1 and Ring Ar 2 are each independently selected, each time they appear, from an aromatic ring having 6 - 30 ring atoms, a heteroaromatic ring having 5 - 30 ring atoms, or a combination thereof; and the total number of ring atoms of Ring Ar 1 and Ring Ar 2 is greater than or equal to 8; R’, R x , R a1 and R a2 each occurrence is independently selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclic group having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted alkynyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermyl having 3-20 carbon atoms, substituted or unsubstituted arylgermyl having 6-20 carbon atoms, substituted or unsubstituted amino group having 0-20 carbon atoms, acyl group, carbonyl group, carboxyl group, ester group, cyano group, isocyano group, hydroxyl group, mercapto group, sulfinyl group, sulfonyl group, phosphino group, and combinations thereof; "*" represents the connection position of Formula 2; Adjacent substituents R’, R x , R a1 , R a2 can optionally be linked to form a ring.

25. An organic layer, the organic layer comprising the light-emitting material according to claim 24.

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