Organic electroluminescent materials and devices thereof

Abstract

Organic electroluminescent materials and devices thereof are disclosed. The organic electroluminescent material is a metal complex with structural ligands shown in a formula 1 and a formula 3, and particularly, the formula 1 contains a specific diphenylene structure. The novel metal complexes can realize dark red and near-infrared light emission, have very strong hole capturing ability, have application potential of becoming excellent dark red to near-infrared light-emitting materials, and can be used as light-emitting materials in organic electroluminescent devices. The invention also discloses an organic electroluminescent device containing the metal complex and a composition containing the metal complex.

Description

TECHNICAL FIELD

[0001] The present application relates to compounds for use in organic electronic devices, such as organic light emitting devices. More particularly, it relates to a metal complex having a ligand of structure Formula 1, and to organic electroluminescent devices and compound compositions comprising the metal complex. BACKGROUND

[0002] Organic electronic devices include, but are not limited to, the following kinds: 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 devices (OFQDs), light emitting electrochemical cells (LECs), organic laser diodes and organic electrophosphorescent devices.

[0003] In 1987, Tang and Van Slyke at Kodak reported a two-layer organic electroluminescent device that included an arylamine hole-transport layer and a tris-8-hydroxyquinoline-aluminum layer as the electron-transport and light-emitting layers (Applied Physics Letters, 1987, 51(12): 913-915). Upon biasing the device, green light emitted from the device. This invention laid the foundation for the development of modern organic light emitting diodes (OLEDs). State-of-the-art 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 anode. Since OLEDs are self-emissive solid state devices, they offer the potential for large area displays and lighting applications. In addition, the intrinsic properties of organic materials, such as their flexibility, can make them well suited for special applications, such as fabrication on flexible substrates.

[0004] OLEDs can be categorized into three different types according to their light emission mechanism. OLEDs invented by Tang and van Slyke are fluorescent OLEDs. It only uses singlet emission. The triplet states generated in the device are wasted through a nonradiative decay channel. Therefore, the internal quantum efficiency (IQE) of fluorescent OLEDs is only 25%. This limitation hinders the commercialization of OLEDs. In 1997, Forrest and Thompson reported phosphorescent OLEDs, which use triplet emission from heavy metals containing complexes as emitters. Therefore, both singlet and triplet states can be harvested, 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.

[0005] OLEDs can also be classified into small molecule and polymer OLEDs according to the form of materials used. Small molecules refer to any organic or organometallic materials that are not polymers. The molecular weight of small molecules can be large as long as they have a precise structure. Dendrimers with a well-defined structure are considered small molecules. Polymer OLEDs include conjugated polymers and non-conjugated polymers with side groups of light-emitting groups. Small molecule OLEDs can become polymer OLEDs if post-polymerization occurs during the manufacturing process.

[0006] There are various OLED manufacturing methods. 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. Small molecule OLEDs can also be manufactured by solution methods if the materials can be dissolved or dispersed in solvents.

[0007] The emission color of OLEDs can be achieved by the structure design of light-emitting materials. OLEDs can include one light-emitting layer or multiple light-emitting layers to achieve the desired spectrum. Green, yellow, and red OLEDs, phosphorescent materials have been successfully commercialized. Blue phosphorescent devices still have problems of blue unsaturation, short device lifetime, and high operating voltage. Commercial full-color OLED displays usually use a hybrid strategy, using blue fluorescent and phosphorescent yellow, or red and green. Currently, the rapid decrease in efficiency of phosphorescent OLEDs at high brightness is still a problem. In addition, it is desirable to have more saturated emission spectrum, higher efficiency, and longer device lifetime.

[0008] An iridium complex having formula I The prior art iridium complexes must have a ligand structure of phenylpyridine, and the application of connecting with other ligands (such as diketone ligand) to form metal complexes is not disclosed or taught, and the unique advantages of the metal complexes are not found.

[0009] For phosphorescent light-emitting materials, there have been reports in the prior art, but further research and development are still needed to meet the increasing demands of the industry for device performance, such as device light-emitting color, light-emitting saturation, voltage, device efficiency, device lifetime, etc. SUMMARY

[0010] The present application aims to provide a series of metal complexes with ligands of formula 1 and formula 3 to solve at least part of the above problems. The metal complexes can achieve deep red and near-infrared light emission and have strong hole trapping ability. These metal complexes have excellent performance and potential application prospects as excellent deep red light-emitting materials.

[0011] According to one embodiment of the present application, a metal complex is disclosed, which has a general formula of M(L a ) m (L b ) n (L c ) q ; wherein the metal M is selected from metals with relative atomic mass greater than 40, L a , L b , and L c are respectively a first ligand, a second ligand and a third ligand coordinated with the metal M;

[0012] L a , L b and L c may be optionally connected to form a polydentate ligand;

[0013] m is selected from 1 or 2, n is selected from 1 or 2, q is selected from 0 or 1, and m+n+q is equal to the oxidation state of the metal M; when m is equal to 2, the two L a are the same or different; when n is equal to 2, the two L b are the same or different;

[0014] the first ligand L a has a structure represented by formula 1:

[0015]

[0016] Z1 and Z2 are each independently selected from C or N, and Z1 and Z2 are different;

[0017] Ring A is selected from an unsaturated carbocyclic ring having 2-30 carbon atoms or an unsaturated heterocyclic ring having 2-30 carbon atoms; Ring B is selected from an unsaturated carbocyclic ring having 4-30 carbon atoms or an unsaturated heterocyclic ring having 4-30 carbon atoms;

[0018] Ring B comprises at least one structure represented by Formula 2:

[0019]

[0020] wherein T is, on each occurrence, the same or different, selected from C or N;

[0021] R A , R B is, on each occurrence, the same or different, mono-, poly-, or un-substituted;

[0022] R A , R B is, on each occurrence, the same or different, 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 heterocyclyl 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 alkylsilicon having 3-20 carbon atoms, substituted or unsubstituted arylsilicon having 6-20 carbon atoms, substituted or unsubstituted alkyl germanium having 3-20 carbon atoms, substituted or unsubstituted aryl germanium having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, thiol, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0023] adjacent substituents R A , R B may optionally be linked to form a ring;

[0024] wherein L b has a structure represented by Formula 3:

[0025]

[0026] X c and X dare selected, on each occurrence, identically or differently, from the group consisting of O, S, Se and NR N2 ;

[0027] R a , R b , R c , R N2 are selected, on each occurrence, identically or differently, 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 heterocyclyl having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atom count, 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 alkylsilicon having 3-20 carbon atoms, substituted or unsubstituted arylsilicon having 6-20 carbon atoms, substituted or unsubstituted alkyl germanium having 3-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0028] adjacent substituents R a , R b , R c , R N2 may optionally be linked to form a ring;

[0029] L c is selected from a monoanionic bidentate ligand.

[0030] According to another embodiment of the present application, an electroluminescent device is also disclosed, which comprises: an anode, a cathode, and an organic layer disposed between the anode and the cathode, the organic layer comprising a metal complex, the specific structure of the metal complex being shown in the aforementioned embodiments.

[0031] According to another embodiment of the present application, a compound composition is also disclosed, which comprises a metal complex, the specific structure of the metal complex being shown in the aforementioned embodiments.

[0032] The metal complex disclosed in the present application comprises ligands of formula 1 and formula 3, the metal complex can realize deep red and near-infrared light emission, and has strong hole trapping ability. These metal complexes have excellent performance and potential application prospect as excellent deep red luminescent materials. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of an organic light-emitting device that may contain the metal complexes and compound compositions disclosed herein.

[0034] Figure 2 This is a schematic diagram of another organic light-emitting device that may contain the metal complexes and compound compositions disclosed herein. Detailed Implementation

[0035] OLEDs can be manufactured on various substrates, such as glass, plastic, and metal. Figure 1 An organic light-emitting device 100 is illustrated schematically and non-limitingly. The figures are not necessarily drawn to scale, and some layer structures may be omitted as needed. Device 100 may 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. Device 100 can be fabricated by sequentially depositing the described layers. The properties and functions of each layer, as well as exemplary materials, are described in more detail in columns 6-10 of U.S. Patent 7,279,704B2, the entire contents of which are incorporated herein by reference.

[0036] Each of these layers has more examples. For example, flexible and transparent substrate-anode combinations are disclosed in U.S. Patent No. 5,844,363, incorporated by reference in its entirety. An example of a p-doped hole-transporting layer is m-MTDATA doped with F4-TCNQ in a 50:1 molar ratio, as disclosed in U.S. Patent Application Publication No. 2003 / 0230980, incorporated by reference in its entirety. Examples of host materials are disclosed in U.S. Patent No. 6,303,238, issued to Thompson et al., incorporated by reference in its entirety. An example of an n-doped electron-transporting layer is BPhen doped with Li in a 1:1 molar ratio, as disclosed in U.S. Patent Application Publication No. 2003 / 0230980, incorporated by reference in its entirety. U.S. Patent Nos. 5,703,436 and 5,707,745, incorporated by reference in their entirety, disclose examples of cathodes, including composite cathodes with a thin layer of metal such as Mg:Ag overlying a transparent, conductive, sputter-deposited ITO layer. The principles and use of a blocking layer are described in more detail in U.S. Patent No. 6,097,147 and U.S. Patent Application Publication No. 2003 / 0230980, incorporated by reference in their entirety. Examples of injection layers are provided in U.S. Patent Application Publication No. 2004 / 0174116, incorporated by reference in its entirety. A description of a protective layer can be found in U.S. Patent Application Publication No. 2004 / 0174116, incorporated by reference in its entirety.

[0037] The layered structure described above is provided by way of non-limiting example. The function of an OLED can be achieved by combining various layers described above, or some layers can be omitted entirely. It can also include other layers not explicitly described. Within each layer, a single material or a mixture of materials can be used to achieve optimal performance. Any functional layer can include several sub-layers. For example, an emissive layer can have two sub-layers of different emissive materials to achieve a desired emission spectrum.

[0038] In one embodiment, an OLED can be described as having a "layer" disposed between the anode and the cathode. The layer can include one or more sub-layers.

[0039] OLEDs also require encapsulation layers, such as Figure 2 An organic light emitting device 200 is shown schematically, non-limitingly, which can be used in the display 100 Figure 1Differently, the cathode 190 can also include an encapsulation layer 102 on top to prevent harmful species 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 organic-inorganic hybrid layers. The encapsulation layer should be placed directly or indirectly on the outside of the OLED device. Multilayer thin film encapsulation is described in U.S. Patent No. 7,968,146 B2, which is incorporated herein by reference in its entirety.

[0040] Devices made according to embodiments of the application can be incorporated into a variety of consumer products having one or more electronic component modules (or units) of the devices. Some examples of these consumer products include flat-panel displays, monitors, medical monitors, televisions, billboards, lights for indoor or outdoor illumination and / or signaling, head-up displays, fully or partially transparent displays, flexible displays, smartphones, tablet computers, phablets, wearable devices, smartwatches, laptop computers, digital cameras, camcorders, viewfinders, micro-displays, 3-D displays, vehicle displays and tail-lights.

[0041] The materials and structures described herein can also be used in other organic electronic devices listed above.

[0042] As used herein, "top" means farthest from the substrate, and "bottom" means closest to the substrate. Where a first layer is described as "disposed" on a second layer, the first layer is disposed farther from the substrate. Unless specified that a first layer is "in contact with" a second layer, there can be other layers between the first and second layers. For example, a cathode can be described as "disposed on" an anode even though various organic layers are between the cathode and the anode.

[0043] As used herein, "solution processible" means capable of being dissolved, dispersed, or transported in and / or deposited from a liquid medium, either in solution or suspension form.

[0044] A ligand can be referred to as "photosensitive" when it is believed to directly contribute to the photoactive properties of the emissive material. A ligand can be referred to as "auxiliary" when it is believed not to contribute to the photoactive properties of the emissive material, but an auxiliary ligand can alter the properties of a photosensitive ligand.

[0045] It is believed that the internal quantum efficiency (IQE) of fluorescent OLEDs can be exceeded by 25% by spin-statistics limit by delayed fluorescence. Delayed fluorescence can be generally classified into two types, P-type delayed fluorescence and E-type delayed fluorescence. P-type delayed fluorescence is generated by triplet-triplet annihilation (TTA).

[0046] On the other hand, E-type delayed fluorescence does not depend on the collision of two triplets, but rather on the conversion between a triplet and a singlet excited state. Compounds capable of E-type delayed fluorescence need to have a small singlet-triplet gap so that the conversion between states is possible. Thermal energy can activate the transition from triplet back to singlet. This type of delayed fluorescence is also called thermally activated delayed fluorescence (TADF). A notable feature of TADF is that the delayed component increases with increasing temperature. If the rate of reverse intersystem crossing (RISC) is fast enough to minimize non-radiative decay from triplet, the fraction of singlet excited states that are refilled can reach 75%. The total singlet fraction can be 100%, far exceeding the 25% of spin statistics for electroluminescent excitons.

[0047] E-type delayed fluorescence characteristics can be seen in exciplex systems or in single compounds. Without being bound by theory, it is believed that E-type delayed fluorescence requires that the light emitting material have a small singlet-triplet energy gap (ΔΕ S-T ). Organic non-metal containing donor-acceptor light emitting materials can be able to achieve this. The emission of these materials is often characterized as donor-acceptor charge transfer (CT) type emission. The spatial separation of the HOMO and LUMO in these donor-acceptor type compounds often results in a small ΔΕ S-T . These states can include CT states. Typically, donor-acceptor light emitting materials are constructed by linking an electron donor moiety (such as an amino or carbazole derivative) with an electron acceptor moiety (such as a N-containing six-membered aromatic ring).

[0048] Definitions of terms regarding substituents

[0049] Halogen or halide - as used herein, includes fluorine, chlorine, bromine and iodine.

[0050] Alkyl - as used herein, includes straight chain and branched chain alkyl groups. Alkyl groups can be alkyl groups having 1 to 20 carbon atoms, preferably alkyl groups having 1 to 12 carbon atoms, more preferably alkyl groups having 1 to 6 carbon atoms. Examples of alkyl groups include methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, isobutyl, t-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. Of the above, methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, isobutyl, t-butyl, n-pentyl, neopentyl and n-hexyl are preferred. Additionally, alkyl groups can be optionally substituted.

[0051] Cycloalkyl - As used herein, cycloalkyl includes cyclic alkyl groups. Cycloalkyl groups can be cycloalkyl groups having 3 to 20 ring carbon atoms, preferably cycloalkyl groups having 4 to 10 carbon atoms. Examples of cycloalkyl groups include cyclobutyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4,4-dimethylcyclohexyl, 1-adamantyl, 2-adamantyl, 1-norbornyl, 2-norbornyl, and the like. Of the above, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4,4-dimethylcyclohexyl are preferred. Additionally, the cycloalkyl group can be optionally substituted.

[0052] Heteroalkyl - As used herein, heteroalkyl includes groups in which one or more carbons of an alkyl group are replaced with a heteroatom selected from the group consisting of nitrogen, oxygen, sulfur, selenium, phosphorus, silicon, germanium, and boron. Heteroalkyl groups can be heteroalkyl groups having 1 to 20 carbon atoms, preferably heteroalkyl groups having 1 to 10 carbon atoms, more preferably heteroalkyl groups having 1 to 6 carbon atoms. Examples of heteroalkyl groups include methoxymethyl, ethoxymethyl, ethoxyethyl, methylthiomethyl, ethylthiomethyl, ethylthioethyl, methoxymethoxy methyl, ethoxymethoxy methyl, ethoxyethoxyethyl, hydroxymethyl, hydroxyethyl, hydroxypropyl, mercaptomethyl, mercaptoethyl, mercaptopropyl, aminomethyl, aminoethyl, aminopropyl, dimethylaminomethyl, trimethylgermylmethyl, trimethylgermylethyl, trimethylgermylisopropyl, dimethylethylgermylmethyl, dimethylisopropylgermylmethyl, t-butyldimethylgermylmethyl, triethygermylmethyl, triethygermylethyl, triisopropylgermylmethyl, triisopropylgermylethyl, trimethylsilylmethyl, trimethylsilylethyl, trimethylsilylisopropyl, triisopropylsilylmethyl, triisopropylsilylethyl. Additionally, the heteroalkyl group can be optionally substituted.

[0053] Alkenyl - As used herein, alkenyl encompasses straight-chain, branched, and cyclic alkene groups. Alkenyl groups can be alkenyl groups containing 2 to 20 carbon atoms, preferably alkenyl groups having 2 to 10 carbon atoms. Examples of alkenyl groups include ethenyl, propenyl, 1 -butenyl, 2-butenyl, 3-butenyl, 1,3-butanedienyl, 1 -methylvinyl, phenethenyl, 2,2-diphenylvinyl, 1,2-diphenylvinyl, 1 -methylallyl, 1,1 -dimethylallyl, 2-methylallyl, 1 -phenylallyl, 2-phenylallyl, 3-phenylallyl, 3,3-diphenylallyl, 1,2-dimethylallyl, 1 -phenyl- 1 -butenyl, 3-phenyl- 1 -butenyl, cyclopentenyl, cyclopentadienyl, cyclohexenyl, cycloheptenyl, cycloheptatrienyl, cyclooctenyl, cyclooctatetraenyl, and norbornenyl. Additionally, the alkenyl group can be optionally substituted.

[0054] Alkynyl – as used herein, encompasses straight-chain alkynyl groups. An alkynyl group can be one containing 2 to 20 carbon atoms, preferably 2 to 10 carbon atoms. Examples of alkynyl groups include ethynyl, propynyl, propynyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-pentynyl, 2-pentynyl, 3,3-dimethyl-1-butynyl, 3-ethyl-3-methyl-1-pentynyl, 3,3-diisopropyl-1-pentynyl, phenylethynyl, phenylpropynyl, etc. Among the above, ethynyl, propynyl, propynyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-pentynyl, and phenylethynyl are preferred. Furthermore, the alkynyl group may be optionally substituted.

[0055] Aryl or aromatic group – as used herein, both non-fused and fused systems are considered. The aryl group can be an aryl group having 6 to 30 carbon atoms, preferably an aryl group having 6 to 20 carbon atoms, and more preferably an aryl group having 6 to 12 carbon atoms. Examples of aryl groups include phenyl, biphenyl, terphenyl, triphenylene, tetraphenylene, naphthalene, anthracene, fenene, fluorene, pyrene, etc. Perylene and azulene, preferably phenyl, biphenyl, terphenyl, triphenylene, fluorene, and naphthalene. Examples of non-fused aryl groups include phenyl, biphenyl-2-yl, biphenyl-3-yl, biphenyl-4-yl, p-terphenyl-4-yl, p-terphenyl-3-yl, p-terphenyl-2-yl, m-terphenyl-4-yl, m-terphenyl-3-yl, m-terphenyl-2-yl, o-tolyl, m-tolyl, p-tolyl, p-(2-phenylpropyl)phenyl, 4'-methyldiphenyl, 4”-tert-butyl-p-terphenyl-4-yl, o-cumyl, m-cumyl, p-cumyl, 2,3-xylyl, 3,4-xylyl, 2,5-xylyl, mesitylene, and m-tetraphenyl. Additionally, the aryl group may optionally be substituted.

[0056] Heterocyclic groups or heterocycles – as used herein, consider non-aromatic cyclic groups. Non-aromatic heterocyclic groups include saturated heterocyclic groups having 3-20 ring atoms and unsaturated non-aromatic heterocyclic groups having 3-20 ring atoms, wherein at least one ring atom is selected from the group consisting of nitrogen, oxygen, sulfur, selenium, silicon, phosphorus, germanium, and boron atoms. Preferred non-aromatic heterocyclic groups are those having 3 to 7 ring atoms, including at least one heteroatom such as nitrogen, oxygen, silicon, or sulfur. Examples of non-aromatic heterocyclic groups include ethylene oxide, oxetane, tetrahydrofuranyl, tetrahydropyranyl, dioxopentacyclic, dioxahexacyclic, acridineyl, dihydropyrroleyl, tetrahydropyrroleyl, piperidinyl, oxazolidinyl, morpholinyl, piperazineyl, oxetane-heptanetrienyl, thioheptanetrienyl, azirane-heptanetrienyl, and tetrahydrothiorroleyl. In addition, the heterocyclic group can be optionally substituted.

[0057] Heteroaryl - As used herein, a non-fused and fused heteroaromatic group that can contain 1 to 5 heteroatoms, at least one of which is selected from the group consisting of nitrogen, oxygen, sulfur, selenium, silicon, phosphorus, germanium and boron. Heteroaryl also refers to heteroaryl. The heteroaryl group can be a heteroaryl group having 3 to 30 carbon atoms, preferably a heteroaryl group having 3 to 20 carbon atoms, more preferably a heteroaryl group having 3 to 12 carbon atoms. Suitable heteroaryls include dibenzothiophene, dibenzofuran, dibenzoselenophene, furan, thiophene, benzofuran, benzothiophene, benzoseleophene, carbazole, indolocarbazole, pyridinoindole, pyrrolopyridine, pyrazole, imidazole, triazole, oxazole, thiazole, oxadiazole, oxatriazole, dioxazole, thiadiazole, pyridine, pyridazine, pyrimidine, pyrazine, triazine, oxazine, oxathiazine, oxadiazine, indole, benzimidazole, indazol, indolizine, benzoxazole, benzoisoxazole, benzothiazole, quinoline, isoquinoline, cinnoline, quinazoline, quinoxaline, naphthridine, phtalazine, pteridine, xanthene, acridine, phenoxazine, phenothiazine, benzofuro[3,2-b]pyridine, furo[3,2-b]dipyridine, benzothieno[3,2-b]pyridine, thieno[3,2-b]dipyridine, benzoseleto[3,2-b]pyridine, seleto[3,2-b]dipyridine, preferably dibenzothiophene, dibenzofuran, dibenzoselenophene, carbazole, indolocarbazole, imidazole, pyridine, triazine, benzimidazole, 1,2-azaborine, 1,3-azaborine, 1,4-azaborine, borazole and nitrogen analogs thereof. Additionally, the heteroaryl group can be optionally substituted.

[0058] Alkoxy - As used herein, represented by -O-alkyl, -O-cycloalkyl, -O-heteroalkyl or -O-heterocyclyl. Examples and preferred examples of alkyl, cycloalkyl, heteroalkyl and heterocyclyl are the same as described above. The alkoxy group can be an alkoxy group having 1 to 20 carbon atoms, preferably an alkoxy group having 1 to 6 carbon atoms. Examples of alkoxy groups include methoxy, ethoxy, propoxy, butoxy, pentoxy, hexyloxy, cyclopropyloxy, cyclobutyloxy, cyclopentyloxy, cyclohexyloxy, tetrahydrofuranyloxy, tetrahydropyranyloxy, methoxypropyloxy, ethoxyethyloxy, methoxymethyloxy and ethoxymethyloxy. Additionally, the alkoxy group can be optionally substituted.

[0059] Aryloxy - As used herein, represented by -O-aryl or -O-heteroaryl. Examples and preferred examples of aryl and heteroaryl are the same as described above. The aryloxy group can be an aryloxy group having 6 to 30 carbon atoms, preferably an aryloxy group having 6 to 20 carbon atoms. Examples of aryloxy groups include phenoxy and biphenyloxy. Additionally, the aryloxy group can be optionally substituted.

[0060] Arylalkyl - as used herein, encompasses an aryl group substituted with an alkyl group. The arylalkyl group can be an arylalkyl group having 7 to 30 carbon atoms, preferably an arylalkyl group having 7 to 20 carbon atoms, more preferably an arylalkyl group having 7 to 13 carbon atoms. Examples of arylalkyl groups include benzyl, 1-phenylethyl, 2-phenylethyl, 1-phenylisopropyl, 2-phenylisopropyl, phenyl-t-butyl, α-naphthylmethyl, 1-α-naphthylethyl, 2-α-naphthylethyl, 1-α-naphthylisopropyl, 2-α-naphthylisopropyl, β-naphthylmethyl, 1-β-naphthylethyl, 2-β-naphthylethyl, 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. Of the foregoing, benzyl, p-cyanobenzyl, m-cyanobenzyl, o-cyanobenzyl, 1-phenylethyl, 2-phenylethyl, 1-phenylisopropyl and 2-phenylisopropyl are preferred. Additionally, the arylalkyl group can be optionally substituted.

[0061] Silyl - as used herein, encompasses a silicon group substituted with an alkyl group. The silyl group can be a silyl group having 3 to 20 carbon atoms, preferably a silyl group having 3 to 10 carbon atoms. Examples of silyl groups include trimethylsilyl, triethylsilyl, methyldiethylsilyl, ethyldimethylsilyl, tripropylsilyl, tributylsilyl, triisopropylsilyl, methyldiisopropylsilyl, dimethylisopropylsilyl, tri-t-butylsilyl, triisobutylsilyl, dimethyl-t-butylsilyl, methyldi-t-butylsilyl. Additionally, the silyl group can be optionally substituted.

[0062] Silyl - as used herein, encompasses a silicon group substituted with an alkyl group. The silyl group can be a silyl group having 3 to 20 carbon atoms, preferably a silyl group having 3 to 10 carbon atoms. Examples of silyl groups include trimethylsilyl, triethylsilyl, methyldiethylsilyl, ethyldimethylsilyl, tripropylsilyl, tributylsilyl, triisopropylsilyl, methyldiisopropylsilyl, dimethylisopropylsilyl, tri-t-butylsilyl, triisobutylsilyl, dimethyl-t-butylsilyl, methyldi-t-butylsilyl. Additionally, the silyl group can be optionally substituted.

[0063] Alkylgermyl - as used herein, encompasses an alkyl-substituted germyl group. The alkylgermyl group can be an alkylgermyl group having 3 to 20 carbon atoms, preferably an alkylgermyl group having 3 to 10 carbon atoms. Examples of alkylgermyl groups include trimethylgermyl, triethylgermyl, methyldiethylgermyl, ethyldimethylgermyl, tripropylgermyl, tributylgermyl, triisopropylgermyl, methyldiisopropylgermyl, dimethylisopropylgermyl, tri-t-butylgermyl, triisobutylgermyl, dimethyl-t-butylgermyl, methyldi-t-butylgermyl. Additionally, the alkylgermyl group can be optionally substituted.

[0064] Arylgermyl - as used herein, encompasses a at least one aryl or heteroaryl substituted germyl group. The arylgermyl group can be an arylgermyl group having 6 to 30 carbon atoms, preferably an arylgermyl group having 8 to 20 carbon atoms. Examples of arylgermyl groups include triphenylgermyl, phenyldiphenylgermyl, diphenylphenylgermyl, phenyldiethylgermyl, diphenylethylgermyl, phenyldimethylgermyl, diphenylmethylgermyl, phenyl diisopropylgermyl, diphenylisopropylgermyl, diphenylbutylgermyl, diphenylisobutylgermyl, diphenyl-t-butylgermyl. Additionally, the arylgermyl group can be optionally substituted.

[0065] The term "aza" in azadibenzofurans, azadibenzothiophenes and the like refers to one or more C-H groups in the corresponding aromatic fragment being replaced with a nitrogen atom. For example, azatriphenylenes include dibenzo[f,h]quinoxaline, dibenzo[f,h]quinoline and other analogs having two or more nitrogens in the ring system. Other nitrogen analogs of the above aza derivatives can be readily envisioned by one of ordinary skill in the art, and all such analogs are intended to be encompassed by the term as described herein.

[0066] In the present disclosure, when any of the terms from the group consisting of substituted alkyl, substituted cycloalkyl, substituted heteroalkyl, substituted heterocyclyl, substituted aralkyl, substituted alkoxy, substituted aryloxy, substituted alkenyl, substituted alkynyl, substituted aryl, substituted heteroaryl, substituted silylalkyl, substituted arylsilyl, substituted silylgermane, substituted arylgermane, substituted amino, substituted acyl, substituted carbonyl, substituted carboxylate, substituted ester, substituted sulfinyl, substituted sulfonyl, and substituted phosphine is used, unless otherwise defined, it means that any of the alkyl, cycloalkyl, heteroalkyl, heterocyclyl, aralkyl, alkoxy, aryloxy, alkenyl, alkynyl, aryl, heteroaryl, silylalkyl, arylsilyl, silylgermane, amino, acyl, carbonyl, carboxylate, ester, sulfinyl, sulfonyl, and phosphine groups can be substituted with one or more of 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 heterocyclyl 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 silylalkyl having 3-20 carbon atoms, unsubstituted arylsilyl having 6-20 carbon atoms, unsubstituted silylgermane having 3-20 carbon atoms, unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylate, ester, cyano, isocyano, hydroxyl, thiol, sulfinyl, sulfonyl, phosphine, and combinations thereof.

[0067] It should be understood that when a molecular fragment is described as a substituent or otherwise attached to another moiety, it can be written by its name depending on whether it is a fragment (e.g., phenyl, phenylene, naphthyl, dibenzofuryl) or whether it is an entire molecule (e.g., benzene, naphthalene, dibenzofuran). As used herein, these different ways of specifying substituents or attached fragments are considered to be equivalent.

[0068] In the compounds mentioned in the present disclosure, hydrogen atoms can be partially or completely replaced by deuterium. Other atoms such as carbon and nitrogen can also be replaced by their other stable isotopes. The replacement of other stable isotopes in the compounds can be preferred due to its enhanced efficiency and stability of the device.

[0069] In the compounds mentioned in the present disclosure, poly-substitution means including di-substitution, up to the range of the maximum available substitution. When a substituent in the compounds mentioned in the present disclosure represents poly-substitution (including di-substitution, tri-substitution, tetra-substitution, etc.), it means that the substituent can exist at multiple available substitution positions on the structure to which it is connected, and the substituent that exists at multiple available substitution positions can be the same structure or different structures.

[0070] In the compounds mentioned in the present disclosure, unless explicitly defined, for example, adjacent substituents can optionally be connected to form a ring, adjacent substituents in the compounds cannot be connected to form a ring. In the compounds mentioned in the present disclosure, adjacent substituents can optionally be connected to form a ring, which includes both the case where adjacent substituents can be connected to form a ring and the case where adjacent substituents are not connected to form a ring. When adjacent substituents can optionally be connected to form a ring, the formed ring can be a single ring or a multiple ring (including a spiro ring, a bridged ring, a fused ring, etc.), and an alicyclic ring, a heteroalicyclic ring, an aromatic ring, or a heteroaromatic ring. In this expression, adjacent substituents can refer to substituents bonded to the same atom, substituents bonded to carbon atoms that are directly bonded to each other, or substituents bonded to carbon atoms that are further apart. Preferably, adjacent substituents refer to substituents bonded to the same carbon atom and substituents bonded to carbon atoms that are directly bonded to each other.

[0071] The expression that adjacent substituents can optionally be connected to form a ring is also intended to mean that two substituents bonded to the same carbon atom are connected to each other by a chemical bond to form a ring, which can be exemplified by the following formula:

[0072]

[0073] The expression that adjacent substituents can optionally be connected to form a ring is also intended to mean that two substituents bonded to carbon atoms that are directly bonded to each other are connected to each other by a chemical bond to form a ring, which can be exemplified by the following formula:

[0074]

[0075] The expression that adjacent substituents can optionally be connected to form a ring is also intended to mean that two substituents bonded to carbon atoms that are further apart are connected to each other by a chemical bond to form a ring, which can be exemplified by the following formula:

[0076]

[0077] In addition, the expression that adjacent substituents can optionally be connected to form a ring is also intended to mean that, in the case where 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 exemplified by the following formula:

[0078]

[0079] According to one embodiment of the present application, a metal complex having a general formula of M(L a ) m (L b ) n (L c ) q is disclosed; wherein the metal M is selected from a metal having an atomic mass greater than 40, L a , L b , L c are respectively a first ligand, a second ligand and a third ligand coordinated to the metal M;

[0080] L a , L b and L c may optionally be linked to form a polydentate ligand;

[0081] m is selected from 1 or 2, n is selected from 1 or 2, q is selected from 0 or 1, m+n+q equals the oxidation state of the metal M; when m equals 2, the two L a are the same or different; when n equals 2, the two L b are the same or different;

[0082] the first ligand L a has a structure represented by Formula 1:

[0083]

[0084] Z1and Z2are each independently selected from C or N, and Z1and Z2are different;

[0085] Ring A is selected from an unsaturated carbocyclic ring having 2-30 carbon atoms or an unsaturated heterocyclic ring having 2-30 carbon atoms; Ring B is selected from an unsaturated carbocyclic ring having 4-30 carbon atoms or an unsaturated heterocyclic ring having 4-30 carbon atoms;

[0086] Ring B comprises at least one structure represented by Formula 2:

[0087]

[0088] wherein T is selected from C or N, the same or different at each occurrence;

[0089] R A , R B represent mono-substitution, poly-substitution or no substitution, the same or different at each occurrence;

[0090] R A , R BEach time it appears, it is selected from the group consisting of the same or different groups of the following: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 cyclic carbon atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, substituted or unsubstituted aroxy groups having 6-30 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, and substituted or unsubstituted alkyl groups having 1-20 carbon atoms. Alkynyl groups having 2-20 carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanium groups having 3-20 carbon atoms, substituted or unsubstituted arylgermanium groups having 6-20 carbon atoms, substituted or unsubstituted amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphinyl, and combinations thereof having 0-20 carbon atoms;

[0091] Adjacent substituent R A R B They can be arbitrarily connected to form a loop;

[0092] Among them, L b The structure represented by Equation 3:

[0093]

[0094] X c and X d Each time it appears, choose from the following groups, either the same or different: O, S, Se, and NR. N2 ;

[0095] R a R b R c R N2each occurrence is the same or different selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having from 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having from 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having from 1-20 carbon atoms, substituted or unsubstituted heterocyclyl having from 3-20 ring atoms, substituted or unsubstituted aralkyl having from 7-30 carbon atoms in length, substituted or unsubstituted alkoxy having from 1-20 carbon atoms, substituted or unsubstituted aryloxy having from 6-30 carbon atoms, substituted or unsubstituted alkenyl having from 2-20 carbon atoms, substituted or unsubstituted alkynyl having from 2-20 carbon atoms, substituted or unsubstituted aryl having from 6-30 carbon atoms, substituted or unsubstituted heteroaryl having from 3-30 carbon atoms, substituted or unsubstituted alkylsilicon having from 3-20 carbon atoms, substituted or unsubstituted arylsilicon having from 6-20 carbon atoms, substituted or unsubstituted alkyl germanium having from 3-20 carbon atoms, substituted or unsubstituted amino having from 0-20 carbon atoms, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0096] adjacent substituents R a , R b , R c , R N2 may optionally be linked to form a ring;

[0097] L c is selected from a monoanionic bidentate ligand.

[0098] According to one embodiment of the present application, wherein, wherein ring B has a structure represented by Formula 2, and the L a has a structure represented by

[0099] Formula 4, Formula 5, or Formula 6:

[0100]

[0101] wherein Z1and Z2are each independently selected from C or N, and Z1and Z2are not the same;

[0102] wherein X1-X6are the same or different at each occurrence selected from N or CR X ;

[0103] R A represents mono-, poly-, or no substitution at each occurrence;

[0104] R A , R Xat each occurrence, is the same or different selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl with 1-20 carbon atoms, substituted or unsubstituted cycloalkyl with 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl with 1-20 carbon atoms, substituted or unsubstituted heterocyclyl with 3-20 ring atoms, substituted or unsubstituted aralkyl with 7-30 carbon atoms, substituted or unsubstituted alkoxy with 1-20 carbon atoms, substituted or unsubstituted aryloxy with 6-30 carbon atoms, substituted or unsubstituted alkenyl with 2-20 carbon atoms, substituted or unsubstituted alkynyl with 2-20 carbon atoms, substituted or unsubstituted aryl with 6-30 carbon atoms, substituted or unsubstituted heteroaryl with 3-30 carbon atoms, substituted or unsubstituted alkylsilicon with 3-20 carbon atoms, substituted or unsubstituted arylsilane with 6-20 carbon atoms, substituted or unsubstituted alkyl germanium with 3-20 carbon atoms, substituted or unsubstituted aryl germanium with 6-20 carbon atoms, substituted or unsubstituted amino with 0-20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, thiol, sulfinyl, sulfonyl, phosphino, and combinations thereof; adjacent substituents R A , R X may optionally be linked to form a ring.

[0105] According to one embodiment of the present application, R X at each occurrence, is the same or different selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl with 1-20 carbon atoms, substituted or unsubstituted cycloalkyl with 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl with 1-20 carbon atoms, substituted or unsubstituted heterocyclyl with 3-20 ring atoms, substituted or unsubstituted alkenyl with 2-20 carbon atoms, substituted or unsubstituted alkynyl with 2-20 carbon atoms, substituted or unsubstituted alkylsilicon with 3-20 carbon atoms, substituted or unsubstituted arylsilane with 6-20 carbon atoms, substituted or unsubstituted alkyl germanium with 3-20 carbon atoms, and combinations thereof; adjacent substituents R X may optionally be linked to form a ring.

[0106] According to one embodiment of the present application, wherein ring A is selected from the group consisting of the following structures:

[0107]

[0108]

[0109] wherein A1-A8 is the same or different at each occurrence selected from N or CR A ;

[0110] X is, on each occurrence, identically or differently, selected from O, S, Se, NR X , CR X R X , SiR X R X or PR X ; when multiple R X are present simultaneously, the multiple R X are identical or different;

[0111] Y is, on each occurrence, identically or differently, selected from O, S, Se, NR Y , CR Y R Y , SiR Y R Y or PR Y ; when multiple R Y are present simultaneously, the multiple R Y are identical or different;

[0112] R A , R X , R Y are, on each occurrence, identically or differently, selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having from 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having from 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having from 1-20 carbon atoms, substituted or unsubstituted heterocyclyl having from 3-20 ring atoms, substituted or unsubstituted aralkyl having from 7-30 carbon atoms, substituted or unsubstituted alkoxy having from 1-20 carbon atoms, substituted or unsubstituted aryloxy having from 6-30 carbon atoms, substituted or unsubstituted alkenyl having from 2-20 carbon atoms, substituted or unsubstituted alkynyl having from 2-20 carbon atoms, substituted or unsubstituted aryl having from 6-30 carbon atoms, substituted or unsubstituted heteroaryl having from 3-30 carbon atoms, substituted or unsubstituted alkylsilicon having from 3-20 carbon atoms, substituted or unsubstituted arylsilane having from 6-20 carbon atoms, substituted or unsubstituted alkyl germanium having from 3-20 carbon atoms, substituted or unsubstituted aryl germanium having from 6-20 carbon atoms, substituted or unsubstituted amino having from 0-20 carbon atoms, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, hydroxyl, thiol, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0113] adjacent substituents R A , R X , R Y may optionally be linked to form a ring.

[0114] According to one embodiment of the present application, the first ligand L aa structure represented by any one of Formula 7 to Formula 30:

[0115]

[0116]

[0117] wherein,

[0118] Z1and Z2are each independently selected from C or N, and Z1and Z2are not the same;

[0119] Y is, on each occurrence, the same or different, selected from O, S, Se, NR Y , CR Y R Y , SiR Y R Y or PR Y ; when multiple R Y are present simultaneously, the multiple R Y are the same or different;

[0120] A1-A8are, on each occurrence, the same or different, selected from N or CR A ;

[0121] X1-X4are, on each occurrence, the same or different, selected from N or CR X , X5-X6are, on each occurrence, the same or different, selected from N or CR Xi ;

[0122] R A , R X , R Xi , R Y are, on each occurrence, the same or different, 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 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 alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amine having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0123] adjacent substituents R A , R X, R Xi , R Y may optionally be joined to form a ring.

[0124] According to one embodiment of the present application, Z1 is C and Z2 is N.

[0125] According to one embodiment of the present application, wherein L a is selected from the group consisting of any one of the structures represented by Formula 7-Formula 8, Formula 10, Formula 15-Formula 16, Formula 18-Formula 19, Formula 21, Formula 23-Formula 24, Formula 26-Formula 27, Formula 29.

[0126] According to one embodiment of the present application, wherein L a is selected from the group consisting of any one of the structures represented by Formula 7-Formula 8, Formula 10, Formula 13, Formula 15-Formula 16, Formula 18, Formula 23-Formula 24, Formula 26.

[0127] According to one embodiment of the present application, wherein in Formula 7 to Formula 30, at least one of A1-A N and / or X1-X M is selected from N.

[0128] According to one embodiment of the present application, wherein in Formula 7, Formula 15, Formula 23, at least one of A3-A4 and / or X5-X6 is selected from N, and in Formula 8-Formula 14, Formula 16-Formula 22, Formula 24-Formula 30, at least one of A5-A6 and / or X5-X6 is selected from N.

[0129] According to one embodiment of the present application, wherein in Formula 7, Formula 15, Formula 23, A3 and / or X5 is selected from N, and in Formula 8-Formula 14, Formula 16-Formula 22, Formula 24-Formula 30, A5 and / or X5 is selected from N.

[0130] According to one embodiment of the present application, wherein in Formula 7 to Formula 30, A1-A N are each independently selected from CR A , X1-X4 are each independently selected from CR X ; X1-X4 are each independently selected from CR Xi , adjacent substituents R A , R X , R Xi may optionally be joined to form a ring.

[0131] According to one embodiment of the present application, wherein the R A , R X , R XiWhen appearing in the same or different forms, they are selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3 to 20 cyclic carbon atoms, substituted or unsubstituted aryl groups having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6 to 20 carbon atoms, cyano groups, and combinations thereof.

[0132] According to one embodiment of the present invention, wherein R A R X R Xi At least one or two of them, each time appearing identically or differently, are selected from the group consisting of: deuterium, halogens, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, cyano groups, and combinations thereof.

[0133] According to one embodiment of the present invention, in formulas 7 to 30, A1-A8 are each independently selected from CR. A X1-X4 are each independently selected from CR X Adjacent substituent R A R X They can be arbitrarily connected to form a ring.

[0134] According to one embodiment of the present invention, wherein R A R X It may be selected, either identically or differently, from hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, cyano, or combinations thereof.

[0135] According to one embodiment of the present invention, wherein R A R X Each time it appears, it is selected from the group consisting of the following, either identically or differently: hydrogen, deuterium, fluorine, methyl, ethyl, isopropyl, isobutyl, tert-butyl, neopentyl, cyclopentyl, cyclopentylmethyl, cyclohexyl, norbornyl, adamantyl, trimethylsilyl, isopropyl dimethylsilyl, phenyl dimethylsilyl, trifluoromethyl, cyano, phenyl, and combinations thereof.

[0136] According to one embodiment of the present application, wherein at least one or two of A1-A4 is selected from CR A , and / or at least one or two of X1-X4 is selected from CR X , and the R A , R X is selected from the group consisting of deuterium, fluorine, methyl, ethyl, isopropyl, isobutyl, t-butyl, neopentyl, cyclopentyl, cyclopentylmethyl, cyclohexyl, norbornyl, adamantyl, trimethylsilyl, isopropyldimethylsilyl, phenyldimethylsilyl, trifluoromethyl, cyano, phenyl, and combinations thereof.

[0137] According to one embodiment of the present application, wherein in formula 7 to formula 30, at least one of X5-X6 is selected from CR Xi , and the R Xi is selected from the group consisting of deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring 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, and combinations thereof.

[0138] According to one embodiment of the present application, wherein the R X is selected from the group consisting of deuterium, fluorine, methyl, ethyl, isopropyl, isobutyl, t-butyl, neopentyl, cyclopentyl, cyclopentylmethyl, cyclohexyl, norbornyl, adamantyl, trimethylsilyl, isopropyldimethylsilyl, phenyldimethylsilyl, trifluoromethyl, cyano, phenyl, and combinations thereof.

[0139] According to one embodiment of the present application, wherein in formula 7 to formula 14, at least one of X5-X6 is selected from CR Xi , and the R Xi is selected from the group consisting of deuterium, fluorine, methyl, ethyl, isopropyl, isobutyl, t-butyl, neopentyl, cyclopentyl, cyclopentylmethyl, cyclohexyl, norbornyl, adamantyl, trimethylsilyl, isopropyldimethylsilyl, phenyldimethylsilyl, trifluoromethyl, cyano, phenyl, and combinations thereof; in formula 15 to formula 30, at least one of X5-X6 is selected from CR Xi , and the R X is selected from the group consisting of deuterium, fluorine, methyl.

[0140] According to one embodiment of the present application, wherein in Formula 13, Formula 14, Formula 21, Formula 22, Formula 29 and Formula 30, Y is, the same or different at each occurrence, selected from the group consisting of O, S, NR Y , CR Y R Y or SiR Y R Y ; when multiple R Y are present simultaneously, the multiple R Y are the same or different.

[0141] R Y is, the same or different at each occurrence, 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 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 amino having 0-20 carbon atoms, acyl, carbonyl, carboxylate, ester, cyano, isocyano, hydroxyl, thiol, sulfinyl, sulfonyl, phosphino, and combinations thereof.

[0142] According to one embodiment of the present application, wherein the Y is O or S.

[0143] According to one embodiment of the present application, wherein L a is, the same or different at each occurrence, selected from the group consisting of the following structures, wherein the L a1 to L a715 are specific structures as recited in Claim 10.

[0144] According to one embodiment of the present application, wherein the metal M is selected from Ir, Rh, Re, Os, Pt, Au or Cu.

[0145] According to one embodiment of the present application, wherein the metal M is selected from Ir, Pt or Os.

[0146] According to one embodiment of the present application, wherein L b is, the same or different at each occurrence, selected from the following structures:

[0147]

[0148] wherein R1-R7 are the same or different at each occurrence selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having from 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having from 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having from 1 to 20 carbon atoms, substituted or unsubstituted aralkyl having from 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having from 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having from 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having from 2 to 20 carbon atoms, substituted or unsubstituted aryl having from 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having from 3 to 30 carbon atoms, substituted or unsubstituted alkylsilicon having from 3 to 20 carbon atoms, substituted or unsubstituted arylsilicon having from 6 to 20 carbon atoms, substituted or unsubstituted amine having from 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof; adjacent substituents R1-R3 or R4-R6 can optionally be linked into a ring.

[0149] According to one embodiment of the present application, wherein at least one or two of R1-R3 are the same or different at each occurrence selected from substituted or unsubstituted alkyl having from 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having from 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having from 1 to 20 carbon atoms, or combinations thereof; and / or at least one or two of R4-R6 are the same or different at each occurrence selected from substituted or unsubstituted alkyl having from 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having from 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having from 1 to 20 carbon atoms, or combinations thereof.

[0150] According to one embodiment of the present application, wherein at least two of R1-R3 are the same or different at each occurrence selected from substituted or unsubstituted alkyl having from 2 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having from 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having from 2 to 20 carbon atoms, or combinations thereof; and / or at least two of R4-R6 are the same or different at each occurrence selected from substituted or unsubstituted alkyl having from 2 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having from 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having from 2 to 20 carbon atoms, or combinations thereof.

[0151] According to one embodiment of the present application, wherein L c is selected from the group consisting of the following structures:

[0152]

[0153] wherein R a , R band R c each occurrence is the same or different, represents single substitution, multiple substitution, or no substitution;

[0154] X b each occurrence is the same or different, selected from the group consisting of O, S, Se, NR N1 and CR C1 R C2 ;

[0155] R a , R b , R c , R N1 , R C1 and R C2 each occurrence is the same or different, selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having from 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having from 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having from 1 to 20 carbon atoms, substituted or unsubstituted aralkyl having from 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having from 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having from 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having from 2 to 20 carbon atoms, substituted or unsubstituted aryl having from 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having from 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having from 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having from 6 to 20 carbon atoms, substituted or unsubstituted amine having from 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0156] wherein, adjacent substituents R a , R b , R c , R N1 , R C1 and R C2 may optionally be linked to form a ring.

[0157] According to one embodiment of the present application, wherein L b each occurrence is the same or different, selected from the group consisting of L b1 to L b322 each occurrence is the same or different, selected from the group consisting of L c to L c1 each occurrence is the same or different, selected from the group consisting of L c231 to L b1 to L b322 , L c1 to L c231 see claim 14 for specific structures of L

[0158] According to one embodiment of the present application, wherein the metal complex has the structure of Ir(L a )2(L b ) or Ir(L a )(L b )(L c ); wherein, when the metal complex has the structure of Ir(L a )2(L b ), L a is selected from any one or any two of the group consisting of L a1 to L a715 , L b is selected from any one of the group consisting of L b1 to L b322 ; when the metal complex has the structure of Ir(L a )(L b )2, L a is selected from any one of the group consisting of L a1 to L a715 , L b is selected from any one or any two of the group consisting of L c1 to L b322 ; when the metal complex has the structure of Ir(L a )(L b )(L c ), L a is selected from any one of the group consisting of L a1 to L a715 , L b is selected from any one or any two of the group consisting of L c1 to L b322 , L c is selected from any one of the group consisting of L c1 to L c231 .

[0159] According to one embodiment of the present application, wherein the metal complex is selected from the group consisting of compound 1 to compound 794; the specific structures of the compound 1 to compound 794 are shown in claim 15.

[0160] According to another embodiment of the present application, an electroluminescent device is also disclosed, which comprises: an anode, a cathode, and an organic layer disposed between the anode and the cathode, the organic layer comprising a metal complex, the specific structure of the metal complex is shown in any one of the foregoing embodiments.

[0161] According to one embodiment of the present application, the organic layer is an emissive layer, and the metal complex is an emissive material.

[0162] According to one embodiment of the present application, the electroluminescent device emits deep red light, infrared light, or white light.

[0163] According to one embodiment of the present application, the emissive layer further comprises at least one host material.

[0164] According to one embodiment of the present application, the at least one host material comprises at least one chemical group selected from the group consisting of benzene, pyridine, pyrimidine, triazine, carbazole, azacarbazole, indolocarbazole, dithiophene, azadithiophene, difuran, azadifuran, dioxothiophene, triphenylene, azatriphenylene, fluorene, silafluorene, naphthalene, quinoline, isoquinoline, quinazoline, quinoxaline, phenanthrene, azaphenanthrene, and combinations thereof.

[0165] According to one embodiment of the present application, the emissive layer of the electroluminescent device further comprises a first host material and a second host material.

[0166] According to one embodiment of the present application, the first host material has a structure represented by Formula 4-1, Formula 4-2, or Formula 4-3:

[0167]

[0168] wherein X1is the same or different at each occurrence and is selected from CR x1 or N;

[0169] X2is the same or different at each occurrence and is selected from C, CR x1 or N;

[0170] L is the same or different at each occurrence and is selected from a single bond, a substituted or unsubstituted arylene group having 6-30 carbon atoms, a substituted or unsubstituted heteroarylene group having 3-30 carbon atoms, or a combination thereof;

[0171] Ar 21 , Ar 22 , Ar 31 , Ar 32 , Ar 33 is the same or different at each occurrence and is selected from a substituted or unsubstituted aryl group having 6-30 carbon atoms, or a substituted or unsubstituted heteroaryl group having 3-30 carbon atoms;

[0172] R x1each occurrence is the same or different selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl with 1-20 carbon atoms, substituted or unsubstituted cycloalkyl with 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl with 1-20 carbon atoms, substituted or unsubstituted heterocyclyl with 3-20 ring atoms, substituted or unsubstituted aralkyl with 7-30 carbon atoms, substituted or unsubstituted alkoxy with 1-20 carbon atoms, substituted or unsubstituted aryloxy with 6-30 carbon atoms, substituted or unsubstituted alkenyl with 2-20 carbon atoms, substituted or unsubstituted alkynyl with 2-20 carbon atoms, substituted or unsubstituted aryl with 6-30 carbon atoms, substituted or unsubstituted heteroaryl with 3-30 carbon atoms, substituted or unsubstituted alkylsilicon with 3-20 carbon atoms, substituted or unsubstituted arylsilicon with 6-20 carbon atoms, substituted or unsubstituted alkyl germanium with 3-20 carbon atoms, substituted or unsubstituted aryl germanium with 6-20 carbon atoms, substituted or unsubstituted amino with 0-20 carbon atoms, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0173] adjacent substituents R x1 may optionally be linked to form a ring.

[0174] In this context, adjacent substituents R x1 may optionally be linked to form a ring, is intended to mean that a group of adjacent substituents, for example, adjacent substituents R x1 may be linked to form a ring. It is obvious that these substituents can also not be linked to form a ring.

[0175] According to one embodiment of the present application, wherein the first host material has a structure represented by Formula 4-1-1, 4-2-1 or Formula 4-3-1:

[0176]

[0177] wherein X1, X2, X3are the same or different at each occurrence selected from CR x1 or N;

[0178] Ar 21 , Ar 22 , Ar 32 , Ar 33 are the same or different at each occurrence selected from substituted or unsubstituted aryl with 6-30 carbon atoms, or substituted or unsubstituted heteroaryl with 3-30 carbon atoms;

[0179] L is, on each occurrence, the same or different, selected from a single bond, a substituted or unsubstituted arylene group having 6-30 carbon atoms, a substituted or unsubstituted heteroarylene group having 3-30 carbon atoms, or a combination thereof;

[0180] R x1 is, on each occurrence, the same or different, 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 heteroalkyl group having 1-20 carbon atoms, a substituted or unsubstituted heterocyclyl group having 3-20 ring atoms, a substituted or unsubstituted aralkyl group having 7-30 carbon atoms, a substituted or unsubstituted alkoxy group having 1-20 carbon atoms, a substituted or unsubstituted aryloxy group having 6-30 carbon atoms, a substituted or unsubstituted alkenyl group having 2-20 carbon atoms, a substituted or unsubstituted alkynyl group having 2-20 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 substituted or unsubstituted arylsilyl group having 6-20 carbon atoms, a substituted or unsubstituted alkylgermanyl group having 3-20 carbon atoms, a substituted or unsubstituted arylgermanyl group having 6-20 carbon atoms, a substituted or unsubstituted amino group having 0-20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxy, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0181] adjacent substituents R x1 may optionally be linked to form a ring.

[0182] According to one embodiment of the present application, wherein the first host material is selected from the group consisting of Compound 1-1-1 to Compound 1-1-104, Compound 1-2-1 to Compound 1-2-100, and Compound 1-3-1 to Compound 1-3-100, wherein the specific structures of the Compound 1-1-1 to Compound 1-3-100 are referred to in claim 19.

[0183] According to one embodiment of the present application, wherein the hydrogen in the Compound 1-1-1 to Compound 1-1-104, Compound 1-2-1 to Compound 1-2-100, and Compound 1-3-1 to Compound 1-3-100 can be partially or completely substituted by deuterium.

[0184] According to one embodiment of the present application, wherein the second host material has a structure represented by Formula 5:

[0185]

[0186] wherein, each occurrence of L1to L3is the same or different and is selected from a single bond, substituted or unsubstituted alkylene having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkylene having 3 to 20 carbon atoms, substituted or unsubstituted arylene having 6 to 30 carbon atoms, substituted or unsubstituted heteroarylene having 3 to 30 carbon atoms, or a combination thereof;

[0187] each occurrence of Ar1to Ar3is the same or different and is selected from substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, or a combination thereof.

[0188] According to one embodiment of the present application, wherein the second host material has a structure represented by Formula 5-1 or Formula 5-2:

[0189]

[0190] wherein, in Formula 5-1, each occurrence of V1to V5is the same or different and is selected from C, N, or CR v , each occurrence of V 11 to V 15 is the same or different and is selected from N or CR v1 , and one of V1to V5is C and is connected to L 43 ;

[0191] in Formula 5-2, each occurrence of V1to V4is the same or different and is selected from C, N, or CR v , each occurrence of V 11 to V 14 is the same or different and is selected from N or CR v1 , and one of V1to V4is C and is connected to L 43 ;

[0192] V is selected from O, S, or Se;

[0193] each occurrence of L 41 to L 43 is the same or different and is selected from a single bond, substituted or unsubstituted alkylene having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkylene having 3 to 20 carbon atoms, substituted or unsubstituted arylene having 6 to 30 carbon atoms, substituted or unsubstituted heteroarylene having 3 to 30 carbon atoms, or a combination thereof;

[0194] each occurrence of Ar 41 and Ar 42 is the same or different and is selected from substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, or a combination thereof;

[0195] Rv , R v1 each occurrence is the same or different selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having from 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having from 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having from 1-20 carbon atoms, substituted or unsubstituted heterocyclyl having from 3-20 ring atoms, substituted or unsubstituted aralkyl having from 7-30 carbon atoms, substituted or unsubstituted alkoxy having from 1-20 carbon atoms, substituted or unsubstituted aryloxy having from 6-30 carbon atoms, substituted or unsubstituted alkenyl having from 2-20 carbon atoms, substituted or unsubstituted aryl having from 6-30 carbon atoms, substituted or unsubstituted heteroaryl having from 3-30 carbon atoms, substituted or unsubstituted alkylsilicon having from 3-20 carbon atoms, substituted or unsubstituted arylsilicon having from 6-20 carbon atoms, substituted or unsubstituted alkyl germanium having from 3-20 carbon atoms, substituted or unsubstituted aryl germanium having from 6-20 carbon atoms, substituted or unsubstituted amino having from 0-20 carbon atoms, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, hydroxyl, thiol, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0196] adjacent substituents R v , R v1 may optionally be linked to form a ring.

[0197] Herein, adjacent substituents R v , R v1 may optionally be linked to form a ring is intended to mean that any one or more of the groups of substituents, for example, between adjacent substituents R v , between adjacent substituents R v1 , and between adjacent substituents R v and R v1 may be linked to form a ring. It is obvious that none of these groups of substituents can also be linked to form a ring.

[0198] According to one embodiment of the present application, wherein at least one of said Ar 41 and Ar 42 is a two or three fused ring structure.

[0199] According to one embodiment of the present application, wherein said Ar 41 and Ar 42 are each occurrence the same or different selected from substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted terphenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted phenanthryl, substituted or unsubstituted triphenylenyl, substituted or unsubstituted substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted terphenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted fluorenyl, substituted or unsubstituted carbazolyl, substituted or unsubstituted dibenzofuranyl, substituted or unsubstituted dibenzothiophenyl, substituted or unsubstituted pyridinyl, substituted or unsubstituted pyrimidinyl, substituted or unsubstituted quinolinyl, substituted or unsubstituted indolocarbazolyl, or a combination thereof.

[0200] According to an embodiment of the present application, in the third compound, L 41 to L 43 is selected from the group consisting of a single bond, substituted or unsubstituted phenylene, substituted or unsubstituted naphthylene, substituted or unsubstituted biphenylene, or a combination thereof.

[0201] According to an embodiment of the present application, the second host material is selected from the group consisting of compounds B-1 to B-236, wherein the specific structures of the compounds B-1 to B-236 are shown in claim 19.

[0202] According to an embodiment of the present application, the hydrogen in the compounds B-1 to B-236 can be partially or completely replaced by deuterium.

[0203] According to an embodiment of the present application, the at least one host material comprises at least one chemical group selected from the group consisting of benzene, pyridine, pyrimidine, triazine, carbazole, azacarbazole, indolocarbazole, dibenzothiophene, azadibenzothiophene, dibenzofuran, azadibenzofuran, dithiophene, triphenylene, azatriphenylene, fluorene, silafluorene, naphthalene, quinoline, isoquinoline, quinazoline, quinoxaline, phenanthrene, azaphenanthrene, and combinations thereof.

[0204] According to another embodiment of the present application, a compound composition is also disclosed, and the specific structures of the compounds are shown in any of the preceding embodiments.

[0205] In combination with other materials

[0206] The materials described herein for use in specific layers in organic light emitting devices can be used in combination with a variety of other materials present in the device. The combinations of these materials are described in detail in US Patent Application US2016 / 0359122A1 at paragraphs 0132-0161, which is incorporated by reference herein in its entirety. The materials described or mentioned therein are non-limiting examples of materials that can be used in combination with the compounds disclosed herein, and the skilled person can readily consult the literature to identify other materials that can be used in combination.

[0207] Materials described herein for use in specific layers of organic light-emitting devices can be used in combination with a variety of other materials present in said devices. For example, the light-emitting dopants disclosed herein can be used in combination with a variety of host layers, transport layers, barrier layers, injection layers, electrodes, and other possible layers. These combinations of materials are described in detail in paragraphs 0080-0101 of U.S. Patent Application US2015 / 0349273A1, the entire contents of which are incorporated herein by reference. The materials described or mentioned herein are non-limiting examples of materials that can be used in combination with the compounds disclosed herein, and those skilled in the art can readily consult the literature to identify other materials that can be used in combination.

[0208] 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 is from commercial sources. The synthesized products were structurally confirmed and characterized using one or more instruments conventional in the art (including but not limited to Bruker's nuclear magnetic resonance spectrometer, Shimadzu's liquid chromatograph, liquid chromatography-mass spectrometry, gas chromatography-mass spectrometry, differential scanning calorimeter, Shanghai Lingguang Technology's fluorescence spectrophotometer, Wuhan Kesite's electrochemical workstation, Anhui Beiyike's sublimation apparatus, etc.) in methods well known to those skilled in the art. In the examples of devices, the characteristics of the devices were also tested using equipment conventional in the art (including but not limited to evaporation machines manufactured by Angstrom Engineering, optical testing systems and lifetime testing systems manufactured by Suzhou Fushida, ellipsometers manufactured by Beijing Liangtuo, etc.) in methods well known to those skilled in the art. Since those skilled in the art are familiar with the use of the above-mentioned equipment, testing methods, and other related content, and can obtain the inherent data of the samples definitively and unaffected, the above-mentioned related content will not be elaborated further in this patent.

[0209] Material synthesis examples:

[0210] The preparation method of the compounds of this invention is not limited. Those skilled in the art can select appropriate raw materials and process routes according to the synthesis objectives. For example, the metal complexes of this invention can be synthesized according to the following route:

[0211] Firstly, one can refer to existing technologies, such as the method in CN111269269A, to prepare L. a Ligand compounds, in obtaining L a Following the ligand compound, the target metal complex can be prepared using commonly used synthetic methods in the prior art, such as using L... a The ligand compound reacts with iridium trichloride trihydrate to give an iridium dimer, which is then reacted with L... b The ligand reacts to the target metal complex, as shown in the following schematic synthetic route:

[0212] Step1:

[0213]

[0214] Step2:

[0215]

[0216] In the synthesis of the metal complexes of the present application, the skilled person can also refer to the prior art or the synthesis methods described in the prior applications such as US20190103574A1, US20220109118A1, CN117534709A; or the skilled person can design a synthesis route through reverse synthesis (retro-synthesis) to effectively synthesize the metal complexes of the present application.

[0217] The skilled person should know that the above preparation method is only an exemplary example, and the skilled person can obtain other compound structures of the present application by improving it.

[0218] The compounds of the present application can achieve deep red to near-infrared luminescence due to the design of the ligand with a biphenyl structure. To further verify the luminescence effect, the energy levels of some compounds of the present application were calculated by DFT.

[0219] DFT calculation of the compounds of the present application:

[0220] DFT calculations were performed on some compounds disclosed in the present application and comparative example compounds RD-A, compound RD-B and compound RD-C using the B3LYP hybrid functional and CEP-31G effective nuclear potential basis set in the Gaussian software package, and the SMD solvation model to simulate the THF solvent environment. The triplet state energy level (T1), HOMO energy level and LUMO energy level data of the compounds were obtained, and the maximum emission wavelength λ (nm) of the compounds was obtained according to the conversion formula λ (nm) = 1240 / T1. The data is recorded and shown in Table 1.

[0221] Table 1 calculation data

[0222]

[0223]

[0224] The structures of the compounds in Table 1 are as follows:

[0225]

[0226]

[0227] Discussion:

[0228] From the calculation results, it can be known that the metal complex using the ligand containing the specific diphenyl structure can realize the triplet state light emission from deep red to infrared; compared with the comparative example compound RD-A, the emission wavelength of the compound 239 of the present application is greatly red shifted from the original 625 nm to 733 nm only by replacing the biphenyl with the diphenyl structure and further connecting with isoquinoline; in addition, the other compounds containing the diphenyl structure can realize the deep red and near infrared light emission, and compared with the compound RD-A, the wavelength is obviously red shifted, which is unexpected, and further indicates that the compound of the present application can realize the deep red to near infrared emission due to the specific diphenyl ligand design; in addition, the HOMO energy level value of the compound of the present application is generally in the range of-5.12 eV to-4.73 eV, which is comparable or shallower than the comparative example compound, indicating that the compound of the present application can have a hole trapping capacity comparable or stronger than the comparative example compound, and the strong hole trapping capacity is conducive to the metal complex of the present application to realize excellent performance in the device, such as low voltage, high device efficiency and long device life, indicating that the metal complex of the present application has great application prospect as a deep red and near infrared light emitting material with excellent performance.

[0229] In summary, the metal complex containing the ligand of formula 1 and formula 3 disclosed in the present application can realize deep red and near infrared light emission, and has stronger hole trapping capacity. It is proved that the metal complex disclosed in the present application has excellent performance and potential application prospect as an excellent deep red light emitting material.

[0230] It should be understood that the various embodiments described herein are by way of example only, and are not intended to limit the scope of the application. Accordingly, the claimed application can include variations to the specific embodiments and preferred embodiments described herein, as will be apparent to one of skill in the art. Many of the materials and structures described herein are by way of example only and are not intended to limit the scope of the application. It is contemplated that the application can be practiced with the specific embodiments and preferred embodiments described herein. It is contemplated that the various theories as to why the application works are not intended to be limiting.

Claims

1. A metal complex having M(L) a ) m (L b ) n (L c ) q The general formula; where, The metal M is selected from metals with a relative atomic mass greater than 40, L a L b L c These are the first ligand, the second ligand, and the third ligand that coordinate with the metal M, respectively. L a L b and L c They can be selectively linked to form multidentate ligands; m is selected from 1 or 2, n is selected from 1 or 2, q is selected from 0 or 1, m+n+q equals the oxidation state of metal M; when m equals 2, the two L a Same or different; when n equals 2, the two L b Same or different; The first ligand L a It has the structure represented by Equation 1: Z1 and Z2 are each independently selected from C or N, and Z1 and Z2 are different; Ring A is selected from an unsaturated carbon ring having 2-30 carbon atoms or an unsaturated heterocycle having 2-30 carbon atoms; Ring B is selected from an unsaturated carbon ring having 4-30 carbon atoms or an unsaturated heterocycle having 4-30 carbon atoms. Ring B contains at least one structure represented by Equation 2: In this case, T is selected from C or N each time it appears, either the same or different. R A R B Each occurrence, whether identical or different, indicates monosubstitution, polysubstitution, or no substitution; R A R B Each time it appears, it is selected from the group consisting of the same or different groups of the following: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 cyclic carbon atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, substituted or unsubstituted aroxy groups having 6-30 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, and substituted or unsubstituted alkyl groups having 1-20 carbon atoms. Alkynyl groups having 2-20 carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanium groups having 3-20 carbon atoms, substituted or unsubstituted arylgermanium groups having 6-20 carbon atoms, substituted or unsubstituted amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphinyl, and combinations thereof having 0-20 carbon atoms; Adjacent substituent R A R B They can be arbitrarily connected to form a loop; Among them, L b It has the structure represented by Equation 3: X c and X d Each time it appears, choose from the following groups, either the same or different: O, S, Se, and NR. N2 ; R a R b R c R N2 Each time it appears, it is selected from the group consisting of the following, either identically or differently: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 ring atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, substituted or unsubstituted aroxy groups having 6-30 carbon atoms, substituted or unsubstituted groups having 2-20 carbon atoms. The group includes alkenyl groups, substituted or unsubstituted alkynyl groups having 2-20 carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanyl groups having 3-20 carbon atoms, substituted or unsubstituted amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, mercapto, sulfinyl, sulfonyl, phosphinyl, and combinations thereof; Adjacent substituent R a R b R c R N2 They can be arbitrarily connected to form a loop; L c Selected from monoanionic bidentate ligands.

2. The metal complex as described in claim 1, wherein, Ring B has a structure represented by Equation 2, and the L a It has a structure represented by Equation 4, Equation 5 or Equation 6: Z1 and Z2 are each independently selected from C or N, and Z1 and Z2 are different; Among them, X1-X6 are selected from N or CR each time they appear, either identically or differently. X ; R A Each occurrence, whether identical or different, indicates monosubstitution, polysubstitution, or no substitution; R A R X Each time it appears, it is selected from the group consisting of the same or different groups of the following: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 cyclic carbon atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, substituted or unsubstituted aroxy groups having 6-30 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, and substituted or unsubstituted alkyl groups having 1-20 carbon atoms. Alkynyl groups having 2-20 carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanium groups having 3-20 carbon atoms, substituted or unsubstituted arylgermanium groups having 6-20 carbon atoms, substituted or unsubstituted amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphinyl, and combinations thereof having 0-20 carbon atoms; Adjacent substituent R A R X They can be arbitrarily connected to form a loop; Preferably, R X Each time it appears, it is selected from hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 cyclic atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, substituted or unsubstituted alkynyl groups having 2-20 carbon atoms, substituted or unsubstituted alkoxysilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanyl groups having 3-20 carbon atoms, and combinations thereof.

3. The metal complex as described in claim 1 or 2, wherein, Ring A is selected from the group consisting of the following structures: Among them, A1-A8 are selected from N or CR each time they appear, either identically or differently. A ; X is selected from O, S, Se, NR each time it appears, either identically or differently. X CR X R X SiR X R X or PR X When multiple R exist simultaneously X At that time, multiple R X Same or different; Y is selected from O, S, Se, NR each time it appears, either identically or differently. Y CR Y R Y SiR Y R Y or PR Y When multiple R exist simultaneously Y At that time, multiple R Y Same or different; R A R X R Y Each time it appears, it is selected from the group consisting of the same or different groups of the following: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 cyclic carbon atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, substituted or unsubstituted aroxy groups having 6-30 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, and substituted or unsubstituted alkyl groups having 1-20 carbon atoms. Alkynyl groups having 2-20 carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanium groups having 3-20 carbon atoms, substituted or unsubstituted arylgermanium groups having 6-20 carbon atoms, substituted or unsubstituted amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphinyl, and combinations thereof having 0-20 carbon atoms; Adjacent substituent R A R X R Y They can be arbitrarily connected to form a ring.

4. The metal complex as described in claim 1, wherein the first ligand L a Choose any one of the structures represented by free form 7 to 30: in, Z1 and Z2 are each independently selected from C or N, and Z1 and Z2 are different; preferably, Z1 is C and Z2 is N; Y is selected from O, S, Se, NR each time it appears, either identically or differently. Y CR Y R Y SiR Y R Y or PR Y When multiple R exist simultaneously Y At that time, multiple R Y Same or different; A1-A8 are selected from N or CR each time they appear, either identically or differently. A ;; X1-X4 are selected from N or CR each time they appear, either identically or differently. X X5-X6 are selected from N or CR each time they appear, either identically or differently. Xi ; R A R X R Xi R Y Each time it appears, it is selected from the group consisting of the following, either identically or differently: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, substituted or unsubstituted aroxy groups having 6-30 carbon atoms, substituted or unsubstituted... Alkenyl groups having 2-20 carbon atoms, aryl groups having 6-30 carbon atoms (substituted or unsubstituted), heteroaryl groups having 3-30 carbon atoms (substituted or unsubstituted), alkylsilyl groups having 3-20 carbon atoms (substituted or unsubstituted), arylsilyl groups having 6-20 carbon atoms (substituted or unsubstituted), and amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, mercapto, sulfinyl, sulfonyl, phosphinyl, and combinations thereof having 0-20 carbon atoms (substituted or unsubstituted). Adjacent substituent R A R X R Xi R Y They can be arbitrarily connected to form a loop; Preferably, L a Choose any one of the following structures: Equation 7-Equation 8, Equation 10, Equation 15-Equation 16, Equation 18-Equation 19, Equation 21, Equation 23-Equation 24, Equation 26-Equation 27, Equation 29; More preferably, L a Choose any one of the following structures: Equations 7-8, 10, 13, 15-16, 18, 23-24, and 26.

5. The metal complex as described in claim 4, wherein, In equations 7 to 30, A1-A N and / or X1-X M At least one of them is selected from N; Preferably, in Equations 7, 15, and 23, at least one of A3-A4 and / or X5-X6 is selected from N; and in Equations 8-14, 16-22, and 24-30, at least one of A5-A6 and / or X5-X6 is selected from N. More preferably, in Formulas 7, 15, and 23, A3 and / or X5 are selected from N, and in Formulas 8-14, 16-22, and 24-30, A5 and / or X5 are selected from N.

6. The metal complex as described in claim 4, wherein, In equations 7 to 30, A1-A N Each independently selected from CR A X1-X4 are each independently selected from CR X X1-X4 are each independently selected from CR Xi Adjacent substituent R A R X R Xi They can be arbitrarily connected to form a loop; Preferably, the R A R X R Xi When appearing in the same or different manner, they are selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3 to 20 cyclic carbon atoms, substituted or unsubstituted aryl groups having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3 to 30 carbon atoms, substituted or unsubstituted alksilyl groups having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6 to 20 carbon atoms, cyano groups, and combinations thereof; More preferably, the R A R X R Xi At least one or two of them, each time appearing identically or differently, are selected from the group consisting of: deuterium, halogens, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, cyano groups, and combinations thereof.

7. The metal complex as described in claim 4, wherein, In equations 7 to 30, A1-A8 are each independently selected from CR. A X1-X4 are each independently selected from CR X Adjacent substituent R A R X They can be arbitrarily connected to form a loop; Preferably, the R A R X It may be selected, either identically or differently, from hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 cyclic carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alksilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, cyano, or combinations thereof; More preferably, the R A R X Each time it appears, it is selected from the group consisting of the following, either the same or different: hydrogen, deuterium, fluorine, methyl, ethyl, isopropyl, isobutyl, tert-butyl, neopentyl, cyclopentyl, cyclopentylmethyl, cyclohexyl, norbornyl, adamantyl, trimethylsilyl, isopropyl dimethylsilyl, phenyl dimethylsilyl, trifluoromethyl, cyano, phenyl, and combinations thereof. Most preferably, at least one or two of A1-A4 are selected from CR A And / or at least one or two of X1-X4 selected from CR X The R A R X Each time it appears, it is selected from the group consisting of the following, either the same or different: deuterium, fluorine, methyl, ethyl, isopropyl, isobutyl, tert-butyl, neopentyl, cyclopentyl, cyclopentylmethyl, cyclohexyl, norbornyl, adamantyl, trimethylsilyl, isopropyl dimethylsilyl, phenyl dimethylsilyl, trifluoromethyl, cyano, phenyl, and combinations thereof.

8. The metal complex as described in claim 4, wherein, In equations 7 to 30, at least one of X5-X6 is selected from CR. Xi And the R Xi Each time it appears, it is selected from the group consisting of the same or different groups of the following: deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alksilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, cyano groups, and combinations thereof; Preferably, the R X i When appearing again, the following groups are selected, either identically or differently: deuterium, fluorine, methyl, ethyl, isopropyl, isobutyl, tert-butyl, neopentyl, cyclopentyl, cyclopentylmethyl, cyclohexyl, norbornyl, adamantyl, trimethylsilyl, isopropyldimethylsilyl, phenyldimethylsilyl, trifluoromethyl, cyano, phenyl, and combinations thereof. More preferably, in formulas 7 to 14, at least one of X5-X6 is selected from CR. Xi And the R Xi When appearing again, the following groups are selected, either identically or differently, from: deuterium, fluorine, methyl, ethyl, isopropyl, isobutyl, tert-butyl, neopentyl, cyclopentyl, cyclopentylmethyl, cyclohexyl, norbornyl, adamantyl, trimethylsilyl, isopropyldimethylsilyl, phenyldimethylsilyl, trifluoromethyl, cyano, phenyl, and combinations thereof; at least one of formulas 15 to 30, X5-X6, is selected from CR. Xi And the R Xi Choose from the following groups: deuterium, fluorine, methyl.

9. The metal complex as described in claim 4, wherein, In Equations 13, 14, 21, 22, 29, and 30, Y is selected from O, S, and NR each time it appears, either identically or differently. Y CR Y R Y , or SiR Y R Y When multiple R exist simultaneously Y At that time, multiple R Y Same or different; R Y Each time it appears, it is selected from the group consisting of the same or different groups of the following: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphin, and combinations thereof. Preferably, Y is O or S.

10. The metal complex of claim 1, wherein, L a Each occurrence is either identical or different from the group consisting of the following structures:

11. The metal complex of claim 1, wherein the metal M is selected from Ir, Rh, Re, Os, Pt, Au or Cu; preferably, the metal M is selected from Ir, Pt or Os; more preferably, the metal M is Ir.

12. The metal complex of claim 1, wherein L b Each occurrence, whether identical or different, is selected from the following structure: in, R1–R7, each time appearing, are selected from the group consisting of, either identically or differently from, hydrogen, deuterium, halogens, substituted or unsubstituted alkyl groups having 1–20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3–20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 1–20 carbon atoms, substituted or unsubstituted aralkyl groups having 7–30 carbon atoms, substituted or unsubstituted alkoxy groups having 1–20 carbon atoms, substituted or unsubstituted aroxy groups having 6–30 carbon atoms, substituted... Or unsubstituted alkenyl groups having 2-20 carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, mercapto, sulfinyl, sulfonyl, phosphinyl, and combinations thereof having 0-20 carbon atoms; Adjacent substituents R1-R3 or R4-R6 can optionally be linked to form a ring; Preferably, at least one or two of R1-R3 are selected, in the same or different manner each time they appear, from substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, or combinations thereof; and / or at least one or two of R4-R6 are selected, in the same or different manner each time they appear, from substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, or combinations thereof; More preferably, wherein at least two of R1-R3 are selected, in the same or different manner each time they appear, from substituted or unsubstituted alkyl groups having 2-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 2-20 carbon atoms, or combinations thereof; and / or at least two of R4-R6 are selected, in the same or different manner each time they appear, from substituted or unsubstituted alkyl groups having 2-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 2-20 carbon atoms, or combinations thereof.

13. The metal complex of claim 1, wherein, L c Selected from the group consisting of the following structures: Among them, R a R b and R c Each occurrence, whether identical or different, indicates monosubstitution, polysubstitution, or no substitution; X b Each time it appears, select the group consisting of the following, either the same or different: O, S, Se, NR N1 and CR C1 R C2 ; R a R b R c R N1 R C1 and R C2 Each time it appears, it is selected from the group consisting of the following, either identically or differently: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, substituted or unsubstituted aroxy groups having 6-30 carbon atoms, substituted or unsubstituted... Alkenyl groups having 2-20 carbon atoms, aryl groups having 6-30 carbon atoms (substituted or unsubstituted), heteroaryl groups having 3-30 carbon atoms (substituted or unsubstituted), alkylsilyl groups having 3-20 carbon atoms (substituted or unsubstituted), arylsilyl groups having 6-20 carbon atoms (substituted or unsubstituted), and amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, mercapto, sulfinyl, sulfonyl, phosphinyl, and combinations thereof having 0-20 carbon atoms (substituted or unsubstituted). Wherein, the adjacent substituent R a R b R c R N1 R C1 and R C2 They can be arbitrarily connected to form a ring.

14. The metal complex of claim 10, wherein, L b Each occurrence is either identical or different from the group consisting of the following structures: Among them, L c Each occurrence is either identical or different from the group consisting of the following structures:

15. The metal complex according to any one of claims 1-14, wherein, The metal complex has Ir(L) a )2(L b ) or Ir(L a (L) b (L) c The structure of ); Wherein, when the metal complex has Ir(L a )2(L b When L is in the structure of ) a Choose L each time it appears, either the same or different. a1 To L a715 Any one or any two of the groups formed, L b Choose freely L b1 To L b322 Any one of the groups; when the metal complex has Ir(L a (L) b (L) c When L is in the structure of ) a Choose freely L a1 To L a715 Any of the groups formed, L b Choose freely L b1 To L b322 Any of the groups formed, L c Choose freely L c1 To L c231 Any one of the groups formed; Preferably, the metal complex is selected from the group consisting of compound 1 to compound 794; The compounds 1 to 794 described herein have Ir(L a )2(L b The structure of ) in which two L a Same, L a and L b These correspond to the structures listed in the table below:

16. An electroluminescent device, comprising: anode, cathode, And an organic layer disposed between the anode and the cathode, the organic layer comprising a metal complex as described in any one of claims 1-15.

17. The device of claim 16, wherein the organic layer is a light-emitting layer and the metal complex is a light-emitting material.

18. The device of claim 16, wherein the electroluminescent device emits deep red light, infrared light, or white light.

19. The device of claim 17, wherein the light-emitting layer further comprises at least one host material; Preferably, the at least one host material comprises at least one chemical group selected from the group consisting of: benzene, pyridine, pyrimidine, triazine, carbazole, azacarbazole, indolecarbazole, dibenzothiophene, azadibenzothiophene, dibenzofuran, azadibenzofuran, dibenzoselenene, triphenylene, azatriphenylene, fluorene, silylfluorene, naphthalene, quinoline, isoquinoline, quinazoline, quinoxaline, phenanthrene, azaphenanthrene, and combinations thereof; More preferably, the light-emitting layer further includes a first host material and a second host material; The first main material is selected from the group consisting of compounds 1-1-1 to 1-1-104, compounds 1-2-1 to 1-2-100, and compounds 1-3-1 to 1-3-62. The second host material is selected from the group consisting of compounds B-1 to B-236:

20. A compound composition comprising the metal complex as described in any one of claims 1-15.

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