An electroluminescent device

Abstract

Disclosed is an electroluminescent device. The electroluminescent device comprises an anode, a cathode, and an organic layer disposed between the anode and the cathode, the organic layer comprising a first compound having a structure of Formula 1a and a second compound having a structure of Formula 2 ligand. This new combination of materials enables the electroluminescent device to achieve lower voltage and higher efficiency, and provides better device performance. Also disclosed is a display assembly comprising the electroluminescent device, and a combination of compounds comprising a first compound having a partial structure of Formula 1a and a second compound having a structure of Formula 2 ligand.

Description

TECHNICAL FIELD

[0001] The present invention relates to electronic devices, such as electroluminescent devices. More particularly, it relates to an electroluminescent device comprising a novel material combination of an organic layer comprising a first compound having a phenoxasiline and analogues thereof as shown in Formula 1a a and a second compound comprising a ligand L having a structure as shown in Formula 2 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 electroluminescent devices.

[0003] In 1987, Tang and Van Slyke at Kodak reported a two-layer organic electroluminescent device comprising 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 tremendous potential for display 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 on flexible substrates.

[0004] OLEDs can be categorized into three different types according to their light emission mechanism. OLED invented by Tang and van Slyke is fluorescent OLED. 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 OLED is only 25%. This limitation hinders the commercialization of OLED. In 1997, Forrest and Thompson reported phosphorescent OLED, which uses 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 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 small singlet-triplet gaps, making it possible for excitons to return from triplet to singlet states. 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 molecule refers to any organic or organometallic material that is not a polymer. The molecular weight of small molecules can be large as long as it has a precise structure. Dendrimers with well-defined structures are considered small molecules. Polymer OLEDs include conjugated polymers and non-conjugated polymers with pendant 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 light-emitting material structure design. OLEDs can include one or more 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] To meet the increasing demand of the industry for the performance of electroluminescent devices, such as the color of light emission, the color saturation of light emission, the driving voltage, the light emission efficiency, the device lifetime, and the like, the research on phosphorescent devices is still in urgent need. In the research on phosphorescent devices, the use of phosphorescent light-emitting materials in combination with host materials is very important, and the selection of the combination of phosphorescent light-emitting materials and host materials directly relates to the light emission performance of the device. Therefore, the selection and optimization of the combination of phosphorescent light-emitting materials and host materials is an important part of the related research in the industry. SUMMARY

[0009] The present application aims to provide an electroluminescent device with a new material combination to solve at least part of the above problems. A new material combination consisting of a first compound having a phenoxazole and similar structures and a second compound containing a ligand L a is used in the electroluminescent device, which can be used in the light-emitting layer of the electroluminescent device. This new material combination can make the electroluminescent device have lower voltage and higher efficiency, and can provide better device performance.

[0010] According to one embodiment of the present application, an electroluminescent device is disclosed, which comprises:

[0011] an anode,

[0012] a cathode,

[0013] and an organic layer disposed between the anode and the cathode, wherein the organic layer comprises at least a first compound and a second compound;

[0014] The first compound has a structure represented by formula 1a:

[0015]

[0016] In formula 1a, A1-A 10 are each independently selected from C, CR A or N; and 3 of A1-A 10 are C; wherein 2 of the C are adjacent and connected to a structure represented by formula 1b; and the other C is connected to a structure represented by formula 1c:

[0017]

[0018] * respectively represent the positions of the connection of formula 1b and formula 1a, and the positions of the connection of formula 1c and formula 1a;

[0019] Ar is selected from a substituted or unsubstituted aryl group having 6-30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3-30 carbon atoms, or a combination thereof;

[0020] L is selected from a single bond, substituted or unsubstituted arylene having 6-30 carbon atoms, substituted or unsubstituted heteroarylene having 3-30 carbon atoms, or a combination thereof;

[0021] V is selected from NR2, O, or S;

[0022] R A , R1, R2are 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 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 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 amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, hydroxyl, thiol, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0023] adjacent substituents R A , R1and R2may optionally be linked to form a ring;

[0024] the second compound is a metal complex comprising a ligand L a coordinated to a metal a having a structure represented by Formula 2:

[0025]

[0026] In Formula 2, Z is selected from O, S, or Se;

[0027] X1-X8are the same or different at each occurrence selected from C, CR x , or N;

[0028] Y1-Y6are the same or different at each occurrence selected from CR y1 , CR y2 , or N; the R y2 have the structure of -L1-SiR s1 R s2 R s3 ;

[0029] R x, R y1 , R s1 , R s2 , R s3 each occurrence is the same or different selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl of 1-20 carbon atoms, substituted or unsubstituted cycloalkyl of 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl of 1-20 carbon atoms, substituted or unsubstituted heterocyclyl of 3-20 ring atoms, substituted or unsubstituted aralkyl of 7-30 carbon atoms, substituted or unsubstituted alkoxy of 1-20 carbon atoms, substituted or unsubstituted aryloxy of 6-30 carbon atoms, substituted or unsubstituted alkenyl of 2-20 carbon atoms, substituted or unsubstituted aryl of 6-30 carbon atoms, substituted or unsubstituted heteroaryl of 3-30 carbon atoms, substituted or unsubstituted alkylsilyl of 3-20 carbon atoms, substituted or unsubstituted arylsilyl of 6-20 carbon atoms, substituted or unsubstituted amino of 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxy, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0030] L1is selected from a single bond, substituted or unsubstituted alkylene of 1-20 carbon atoms, substituted or unsubstituted cycloalkylene of 3-20 carbon atoms, substituted or unsubstituted arylene of 6-20 carbon atoms, substituted or unsubstituted heteroarylene of 3-20 carbon atoms, or combinations thereof;

[0031] adjacent substituents R x , R s1 , R s2 , R s3 may optionally be linked to form a ring.

[0032] According to one embodiment of the present invention, a display assembly is disclosed, comprising an electroluminescent device as shown in the preceding embodiments.

[0033] According to another embodiment of the present invention, a compound combination is also disclosed, comprising at least the first compound and the second compound.

[0034] The present invention discloses a novel electroluminescent device, in which a novel material combination consisting of a first compound having a phenoxazole and similar structures and a second compound comprising a ligand L a can be used in the light-emitting layer of the electroluminescent device. This novel material combination can make the novel electroluminescent device obtain lower voltage and higher efficiency, and can provide better device performance. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a schematic diagram of an organic light emitting device that can contain an electroluminescent device disclosed herein.

[0036] Figure 2 is a schematic diagram of another organic light emitting device that can contain an electroluminescent device disclosed herein. DETAILED DESCRIPTION

[0037] OLEDs can be manufactured on a variety of substrates, such as glass, plastic, and metal. Figure 1 A schematic, non-limiting, organic light emitting device 100 is shown. The figures are not necessarily drawn to scale, and some layer structures in the figures can be omitted as desired. Device 100 can include a substrate 101, an anode 110, a hole injection layer 120, a hole transport layer 130, an electron blocking layer 140, a light emitting layer 150, a hole blocking layer 160, an electron transport layer 170, an electron injection layer 180, and a cathode 190. Device 100 can be fabricated by sequentially depositing the layers described. The properties and functions of the various layers and exemplary materials are described in more detail in U.S. Patent No. 7,279,704 B2, columns 6-10, the entire contents of which are incorporated by reference.

[0038] There are many more examples of each of these layers. 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 entireties, disclose examples of cathodes, including composite cathodes having a thin layer of a metal such as Mg:Ag overlying a transparent, conductive, sputter-deposited ITO layer. The principles and use of blocking layers are described in more detail in U.S. Patent No. 6,097,147 and U.S. Patent Application Publication No. 2003 / 0230980, incorporated by reference in their entireties. 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.

[0039] The layered structure described above is provided by way of non-limiting example. The functionality 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 layers of different emissive materials to achieve a desired emission spectrum.

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

[0041] OLEDs also require encapsulation layers, such as Figure 2 An illustrative, non-limiting organic light emitting device 200 is shown, which is similar to Figure 1 Instead, the cathode 190 can also include an encapsulation layer 102 on top to prevent harmful substances from the environment, such as moisture and oxygen. Any material capable of providing an encapsulation function can be used as the encapsulation layer, such as glass or an organic-inorganic hybrid layer. The encapsulation layer should be placed directly or indirectly 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 by reference herein in its entirety.

[0042] 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 device. 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.

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

[0044] 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 than the second layer. Unless specified that the first layer is "in contact with" the second layer, other layers can be 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.

[0045] 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.

[0046] A ligand can be termed "photosensitizing" when it is believed to directly contribute to the photoactive properties of an emissive material. A ligand can be termed "auxiliary" when it is believed not to contribute to the photoactive properties of an emissive material, but an auxiliary ligand can alter the properties of a photosensitizing ligand.

[0047] It is believed that the internal quantum efficiency (IQE) of fluorescent OLEDs can be exceeded by 25% of the 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).

[0048] On the other hand, E-type delayed fluorescence does not rely on the collision of two triplets, but rather on the conversion between a triplet and a singlet excited state. A compound capable of generating E-type delayed fluorescence needs to have a small singlet-triplet energy 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 known as 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 spin-statistics limit of 25% for electrically generated excitons.

[0049] 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 (ΔE 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 ΔE 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).

[0050] Definitions of substituent terms

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

[0052] Alkyl - As used herein, includes straight-chain and branched-chain 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. In addition, alkyl groups can be optionally substituted.

[0053] Cycloalkyl - As used herein 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. In addition, cycloalkyl groups can be optionally substituted.

[0054] Heteroalkyl - As used herein, heteroalkyl groups include one or more carbons in the alkyl chain being replaced by a heteroatom selected from the group consisting of nitrogen, oxygen, sulfur, selenium, phosphorus, silicon, germanium, and boron atoms. 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, trimethylsilyl, dimethylethylsilyl, dimethylisopropylsilyl, t-butyldimethylsilyl, triethylsilyl, triisopropylsilyl, trimethylsilylmethyl, trimethylsilyl ethyl, trimethylsilylisopropyl. In addition, heteroalkyl groups can be optionally substituted.

[0055] Alkenyl - As used herein, encompasses straight-chain, branched-chain, and cyclic alkenyl 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-buten- dienyl, 1 -methyl-ethenyl, phenethenyl, 2,2-diphenylethenyl, 1,2-diphenylethenyl, 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.

[0056] Alkynyl - As used herein, encompasses straight-chain alkynyl groups. Alkynyl groups can be alkynyl groups containing 2 to 20 carbon atoms, preferably alkynyl groups having 2 to 10 carbon atoms. Examples of alkynyl groups include ethynyl, propynyl, propargyl, 1 -butynyl, 2-butynyl, 3-butynyl, 1 -pentynyl, 2-pentynyl, 3,3-dimethyl- 1 -butynyl, 3-ethyl-3-methyl- 1 -pentynyl, 3,3-diisopropyl 1 -pentynyl, phenylacetylenyl, phenylpropynyl, and the like. Of the above, ethynyl, propynyl, propargyl, 1 -butynyl, 2-butynyl, 3-butynyl, 1 -pentynyl, and phenylacetylenyl are preferred. Additionally, the alkynyl group can be optionally substituted.

[0057] Aryl or aromatic - As used herein, both non-fused and fused systems are contemplated. Aryl groups can be aryl groups having 6 to 30 carbon atoms, preferably 6 to 20 carbon atoms, more preferably aryl groups having 6 to 12 carbon atoms. Examples of aryl groups include phenyl, biphenyl, terphenyl, triphenylene, tetraphenylene, naphthyl, anthryl, azulenyl, phenanthryl, fluorenyl, pyrenyl, perylenyl, and azulenylenyl, preferably phenyl, biphenyl, terphenyl, triphenylene, fluorenyl, and naphthyl. 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'-methylbiphenyl, 4"-tert-butyl-p-terphenyl-4-yl, o-cumyl, m-cumyl, p-cumyl, 2,3-xylyl, 3,4-xylyl, 2,5-xylyl, mesityl, and m-quaterphenyl. Additionally, the aryl group can be optionally substituted.

[0058] ​Heterocyclyl or heterocycle - as used herein, non-aromatic cyclic groups are contemplated. Non-aromatic heterocyclyl 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 a nitrogen atom, an oxygen atom, a sulfur atom, a selenium atom, a silicon atom, a phosphorus atom, a germanium atom and a boron atom. Preferred non-aromatic heterocyclyl groups are those having 3 to 7 ring atoms, which include at least one heteroatom such as nitrogen, oxygen, silicon or sulfur. Examples of non-aromatic heterocyclyl groups include oxiranyl, oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, dioxolanyl, dioxanyl, aziridinyl, dihydropyrrolyl, tetrahydropyrrolyl, piperidinyl, oxazolidinyl, morpholinyl, piperazinyl, oxepanyl, thiepanyl, azepanyl and tetrahydrothiopyranyl. Additionally, the heterocyclyl group can be optionally substituted.

[0059] Heteroaryl - as used herein, non-fused and fused heteroaromatic groups containing 1 to 5 heteroatoms, wherein at least one heteroatom is selected from the group consisting of a nitrogen atom, an oxygen atom, a sulfur atom, a selenium atom, a silicon atom, a phosphorus atom, a germanium atom and a boron atom. Heteroaryl also refers to heteroaromatic. Heteroaryl groups can be heteroaryl groups having 3 to 30 carbon atoms, preferably heteroaryl groups having 3 to 20 carbon atoms, more preferably heteroaryl groups having 3 to 12 carbon atoms. Suitable heteroaryl groups include dibenzothiophene, dibenzofuran, dibenzoselenophene, furan, thiophene, benzofuran, benzothiophene, benzoselenophene, carbazole, indolocarbazole, pyridinoindole, pyrrolopyridine, pyrazole, imidazole, triazole, oxazole, thiazole, oxadiazole, oxatriazole, dioxazole, thiadiazole, pyridine, pyridazine, pyrimidine, pyrazine, triazine, oxazine, oxathiazine, oxadiazine, indole, benzimidazole, indazole, indolizine, benzoxazole, benzoisoxazole, benzothiazole, quinoline, isoquinoline, cinnoline, quinazoline, quinoxaline, naphthridine, phtalazine, pteridine, xanthene, acridine, phenoxazine, phenothiazine, benzofuro[3,2-d]pyridine, furo[3,2-d]dipyridine, benzothieno[3,2-d]pyridine, thieno[3,2-d]dipyridine, benzoseleno[3,2-d]pyridine, seleno[3,2-d]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.

[0060] Alkoxy - as used herein, is 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. In addition, the alkoxy group can be optionally substituted.

[0061] Aryloxy - as used herein, is 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. In addition, the aryloxy group can be optionally substituted.

[0062] Arylalkyl - as used herein, encompasses an aryl-substituted 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 above, benzyl, p-cyanobenzyl, m-cyanobenzyl, o-cyanobenzyl, 1-phenylethyl, 2-phenylethyl, 1-phenylisopropyl, and 2-phenylisopropyl are preferred. In addition, the arylalkyl group can be optionally substituted.

[0063] Alkylsilyl - as used herein, encompasses a silyl group substituted with an alkyl group. The alkylsilyl group can be an alkylsilyl group having 3 to 20 carbon atoms, preferably an alkylsilyl group having 3 to 10 carbon atoms. Examples of alkylsilyl groups include trimethylsilyl, triethylsilyl, methyldiethylsilyl, ethyldimethylsilyl, tripropylsilyl, tributylsilyl, triisopropylsilyl, methyldiisopropylsilyl, dimethylisopropylsilyl, tri-t-butylsilyl, triisobutylsilyl, dimethyl-t-butylsilyl, methyldi-t-butylsilyl. Additionally, the alkylsilyl group can be optionally substituted.

[0064] Arylsilyl - as used herein, encompasses a silyl group substituted with at least one aryl group. The arylsilyl group can be an arylsilyl group having 6 to 30 carbon atoms, preferably an arylsilyl group having 8 to 20 carbon atoms. Examples of arylsilyl groups include triphenylsilyl, phenyldiphenylsilyl, diphenylphenylsilyl, phenyldiethylsilyl, diphenylethylsilyl, phenyldimethylsilyl, diphenylmethylsilyl, phenyldiisopropylsilyl, diphenylisopropylsilyl, diphenylbutylsilyl, diphenylisobutylsilyl, diphenyl-t-butylsilyl. Additionally, the arylsilyl 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 alkylsilyl, substituted arylsilyl, substituted amino, substituted acyl, substituted carbonyl, substituted carboxylic acid, 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, alkylsilyl, arylsilyl, amino, acyl, carbonyl, carboxylic acid, 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 alkylsilyl having 3-20 carbon atoms, unsubstituted arylsilyl having 6-20 carbon atoms, unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, mercapto, 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 according to whether it is a fragment (e.g., phenyl, phenylene, naphthyl, dibenzofuryl) or according to 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, 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] 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 substituents bonded to carbon atoms that are directly bonded to each other 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:

[0076]

[0077] According to one embodiment of the present invention, an electroluminescent device is disclosed, comprising:

[0078] an anode,

[0079] a cathode,

[0080] and an organic layer disposed between the anode and the cathode, wherein the organic layer comprises at least a first compound and a second compound;

[0081] the first compound has a structure represented by Formula la:

[0082]

[0083] in Formula la, A1-A 10 are each independently selected from C, CR A or N; and three of A1-A 10 are C; wherein two of the Cs are adjacent and connected to a structure represented by Formula lb; and the other C is connected to a structure represented by Formula lc:

[0084]

[0085] * represent the positions of the connection of Formula lb to Formula la, and Formula lc to Formula la, respectively;

[0086] Ar is selected from substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, or a combination thereof;

[0087] L is selected from a single bond, substituted or unsubstituted arylene having 6-30 carbon atoms, substituted or unsubstituted heteroarylene having 3-30 carbon atoms, or a combination thereof;

[0088] V is selected from NR2, O, or S;

[0089] R A , R1, R2are 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 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 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 arylsilane having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, hydroxyl, thiol, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0090] adjacent substituents R A R1, R2may optionally be joined to form a ring;

[0091] the second compound is a metal complex comprising a ligand L coordinated to a metal a and the metal is selected from metals having an atomic mass greater than 40; L a having a structure represented by Formula 2:

[0092]

[0093] In Formula 2, Z is selected from O, S, or Se;

[0094] X1-X8are the same or different at each occurrence and are selected from C, CR x , or N;

[0095] Y1-Y6are the same or different at each occurrence and are selected from CR y1 , CR y2 , or N; the R y2 have the structure -L1-SiR s1 R s2 R s3 ;

[0096] R x , R y1 , R s1 , R s2 , R s3 are the same or different at each occurrence and are 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 alkylsilyl having from 3-20 carbon atoms, substituted or unsubstituted arylsilyl having from 6-20 carbon atoms, substituted or unsubstituted amino having from 0-20 carbon atoms, acyl, carbonyl, carboxylate, ester, cyano, isocyano, hydroxyl, thiol, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0097] L1is selected from a single bond, substituted or unsubstituted alkylene having 1-20 carbon atoms, substituted or unsubstituted cycloalkylene having 3-20 carbon atoms, substituted or unsubstituted arylene having 6-20 carbon atoms, substituted or unsubstituted heteroarylene having 3-20 carbon atoms, or a combination thereof;

[0098] adjacent substituents R x , R s1 , R s2 , R s3 may optionally be linked to form a ring.

[0099] In this context, adjacent substituents R A , R1and R2may optionally be linked to form a ring is intended to mean that any one or more of the groups of adjacent substituents, for example, between adjacent substituents R A , between substituents R A and R2, and between substituents R1and R2, can be linked to form a ring. Obviously, none of these groups of substituents can also be linked to form a ring.

[0100] In embodiments, adjacent substituents R x , R s1 , R s2 , R s3 may optionally be linked to form a ring is intended to mean that any one or more of the groups of adjacent substituents, for example, between adjacent substituents R x , between substituents R s1 and R s2 , between substituents R s1 and R s3 , and between substituents R s2 and R s3 may be linked to form a ring. Obviously, none of these groups of substituents can also be linked to form a ring.

[0101] According to one embodiment of the present application, in Formula 1a, A1-A 10 are each independently selected from C, CR A or N, and at least one of A1-A 10 is selected from N.

[0102] According to one embodiment of the present application, wherein the first compound has a structure represented by one of Formula 1a-1 to Formula 1a-6:

[0103]

[0104] In Formula 1a-1 to Formula 1a-6,

[0105] A1-A 10are selected, the same or different at each occurrence, from C, CR A or N; and one of A1-A 10 is C and is connected to a structure represented by Formula 1c:

[0106]

[0107] * indicates the position at which Formula 1c is connected to Formula 1a-1 to Formula 1a-6;

[0108] Ar is selected from substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, or a combination thereof;

[0109] L is selected from a single bond, substituted or unsubstituted arylene having 6-30 carbon atoms, substituted or unsubstituted heteroarylene having 3-30 carbon atoms, or a combination thereof;

[0110] V is selected from NR2, O, or S;

[0111] R A , R1, R2are selected, the same or different at each occurrence, 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 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 amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, hydroxyl, thiol, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0112] adjacent substituents R A , R1and R2may optionally be linked to form a ring.

[0113] In this embodiment, in Formula 1a-1 to Formula 1a-6, A1-A 10 are selected, the same or different at each occurrence, from C, CR A or N; and one of A1-A 10 is C and is connected to a structure represented by Formula 1c, is intended to mean:

[0114] In Formula 1a-1 and Formula 1a-4, A3-A 10 are the same or different at each occurrence selected from C, CR A or N; and one of A3-A 10 is C and is connected to a structure represented by Formula 1c;

[0115] In Formula 1a-2 and Formula 1a-5, A1and A4-A 10 are the same or different at each occurrence selected from C, CR A or N; and one of A1and A4-A 10 is C and is connected to a structure represented by Formula 1c;

[0116] In Formula 1a-3 and Formula 1a-6, A1-A2and A5-A 10 are the same or different at each occurrence selected from C, CR A or N; and one of A1-A2and A5-A 10 is C and is connected to a structure represented by Formula 1c.

[0117] According to one embodiment of the present application, V in Formula 1a-1 to Formula 1a-6 is selected from O or S.

[0118] According to one embodiment of the present application, V in Formula 1a-1 to Formula 1a-6 is O.

[0119] According to one embodiment of the present application, wherein the R A , R1and R2are the same or different at each occurrence selected from the group consisting of hydrogen, deuterium, halogen, cyano, hydroxyl, thiol, substituted or unsubstituted alkyl having 1-20 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, and combinations thereof.

[0120] According to one embodiment of the present application, wherein the R A , R1and R2are the same or different at each occurrence selected from the group consisting of hydrogen, deuterium, fluorine, cyano, hydroxyl, thiol, methyl, trideuteromethyl, ethenyl, phenyl, biphenyl, naphthyl, 4-cyanophenyl, dibenzofuranyl, dibenzothiophenyl, triphenylenyl, carbazolyl, 9-phenylcarbazolyl, 9,9-dimethylfluorenyl, pyridyl, phenylpyridyl, and combinations thereof.

[0121] According to one embodiment of the present application, wherein Ar in Formula 1c has a structure represented by one of Formula 1c-1 to Formula 1c-3:

[0122]

[0123] wherein,

[0124] In Formula 1c-1, B1-B6are the same or different at each occurrence selected from C, CR B or N;

[0125] In Formula 1c-2, B1-B8are the same or different at each occurrence selected from C, CR B or N;

[0126] In Formula 1c-3, B1-B8are the same or different at each occurrence selected from C, CR B or N; G is selected from CR g R g , SiR g R g , NR g , BR g , PR g , O, S or Se; when two R g are present simultaneously, the two R g may be the same or different;

[0127] R B , R g are the same or different at each occurrence 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 alkylsilyl having from 3-20 carbon atoms, substituted or unsubstituted arylsilyl having from 6-20 carbon atoms, and combinations thereof;

[0128] “︴” indicates the position where the Ar structure is connected to the L in Formula 1c;

[0129] adjacent substituents R B and R g may optionally be linked to form a ring.

[0130] Herein, adjacent substituents R B and R g may optionally be linked to form a ring is intended to mean that where adjacent substituent groups, for example, between two substituents R B , two substituents Rg between, and substituents R B and R g between, any one or more of these groups of substituents can be linked to form a ring. Obviously, none of these substituents can also be linked to form a ring between each other.

[0131] According to one embodiment of the present application, wherein Ar in formula 1c has a structure represented by one of formula 1c-11 to formula 1c-20:

[0132]

[0133] In formula 1c-11 to formula 1c-20, B1-B n are each, the same or different at each occurrence, selected from CR B or N; the B n corresponding to B1-B 12 In formula 1c-11 to formula 1c-20, the maximum number of which is present in any one of formula 1c-11 to formula 1c-20, G is each, the same or different at each occurrence, selected from CR g R g , SiR g R g , NR g , BR g , PR g , O, S or Se; when two R g are present at the same time, the two R g may be the same or different;

[0134] R B , R g are each, 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 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 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, and combinations thereof;

[0135] “︴” indicates the position where the Ar structure is connected with L in formula 1c;

[0136] adjacent substituents R B and Rg optionally linked to form a ring.

[0137] In the present context, in formula 1c-11 to 1c-20, B1-B n are the same or different at each occurrence selected from CR B or N; the B n correspond to the B1-B 12 are the same or different at each occurrence selected from CR g R g , SiR g R g , NR g , BR g , PR g , O, S or Se; when two R g are present at the same time, the two R g may be the same or different, are intended to mean:

[0138] In formula 1c-11, B1-B5are the same or different at each occurrence selected from CR B or N;

[0139] In formula 1c-12, B1and B3-B8are the same or different at each occurrence selected from CR B or N;

[0140] In formula 1c-13, B2-B8are the same or different at each occurrence selected from CR B or N;

[0141] In formula 1c-14 and 1c-15, B1and B3-B 12 are the same or different at each occurrence selected from CR B or N;

[0142] In formula 1c-16, B1-B4, B7-B 12 are the same or different at each occurrence selected from CR B or N;

[0143] In formula 1c-17, B2-B8are the same or different at each occurrence selected from CR B or N; G is the same or different at each occurrence selected from CR g R g , SiR g R g , NR g , BR g , PR g , O, S or Se; when two R g are present at the same time, the two R gmay be the same or different;

[0144] In formula 1c-18, B1, B3-B8 are the same or different at each occurrence selected from CR B or N; G is the same or different at each occurrence selected from CR g R g , SiR g R g , NR g , BR g , PR g , O, S or Se; when two R g are present at the same time, the two R g may be the same or different;

[0145] In formula 1c-19, B1-B2, B4-B8 are the same or different at each occurrence selected from CR B or N; G is the same or different at each occurrence selected from CR g R g , SiR g R g , NR g , BR g , PR g , O, S or Se; when two R g are present at the same time, the two R g may be the same or different;

[0146] In formula 1c-20, B1-B3 and B5-B8 are the same or different at each occurrence selected from CR B or N; G is the same or different at each occurrence selected from CR g R g , SiR g R g , NR g , BR g , PR g , O, S or Se; when two R g are present at the same time, the two R g may be the same or different.

[0147] According to one embodiment of the present application, in formula 1c-11, at least one of B1, B3, B5 is N, and the rest are each independently selected from CR B or N; in formula 1c-12 to 1c-20, at least one of B n is N, and the rest are each independently selected from CR n corresponding to the B1-B 12 The maximum number of serial numbers present in any one of formula 1c-11 to formula 1c-20, and the rest are each independently selected from CR B or N.

[0148] According to one embodiment of the present application, in Formula 1c-11, two or three of B1, B3, B5 are N, and the rest are each independently selected from CR B or N; B1-B n at least two of which are N, correspond to B n at least two of which are N, correspond to B 12 The largest of the numbers present in any one of Formula 1c-11 to Formula 1c-20, and the rest are each independently selected from CR B or N.

[0149] According to one embodiment of the present application, wherein R B is, at each occurrence, the same or different, selected from the group consisting of hydrogen, deuterium, halogen, cyano, hydroxyl, thiol, substituted or unsubstituted alkyl having 1-20 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, and combinations thereof.

[0150] According to one embodiment of the present application, wherein R B is, at each occurrence, the same or different, selected from the group consisting of hydrogen, deuterium, methyl, trideuteromethyl, vinyl, phenyl, biphenyl, naphthyl, 4-cyanophenyl, dibenzofuranyl, dibenzothiophenyl, triphenylenyl, carbazolyl, 9-phenylcarbazolyl, 9,9-dimethylfluorenyl, pyridyl, phenylpyridyl, and combinations thereof.

[0151] According to one embodiment of the present application, wherein B1-B n at least one of which is CR B , correspond to B n at least two of which are N, correspond to B 12 The largest of the numbers present in any one of Formula 1c-11 to Formula 1c-20, and R B is selected from the group consisting of deuterium, halogen, cyano, hydroxyl, thiol, substituted or unsubstituted alkyl having 1-20 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, and combinations thereof.

[0152] According to one embodiment of the present application, wherein B1-B n at least one of which is CR B , correspond to B n at least two of which are N, correspond to B 12The maximum number of the serial numbers present in any one of Formula 1c-11 to Formula 1c-20, and the R B is selected from the group consisting of deuterium, methyl, trideuteromethyl, ethenyl, phenyl, biphenyl, naphthyl, 4-cyanophenyl, dibenzofuranyl, dibenzothiophenyl, triphenylenyl, carbazolyl, 9-phenylcarbazolyl, 9,9-dimethylfluorenyl, pyridyl, phenylpyridyl, and combinations thereof.

[0153] According to one embodiment of the present application, wherein Ar in Formula 1c is selected from the group consisting of Ar-1 to Ar-78, wherein the specific structures of Ar-1 to Ar-78 are found in Claim 9.

[0154] According to one embodiment of the present application, wherein optionally, the hydrogen in the structure of Ar-1 to Ar-78 can be partially or fully substituted with deuterium.

[0155] According to one embodiment of the present application, wherein L is selected from the group consisting of a single bond, substituted or unsubstituted arylene of 6-18 carbon atoms, substituted or unsubstituted heteroarylene of 3-18 carbon atoms, and combinations thereof.

[0156] According to one embodiment of the present application, wherein L is selected from the group consisting of a single bond, phenylene, naphthylene, biphenylene, terphenylene, triphenylenylene, pyridylene, thiophenylene, dibenzofuranylene, dibenzothiophenylene, and combinations thereof.

[0157] According to one embodiment of the present application, wherein the first compound is selected from the group consisting of E-1 to E-91, wherein the specific structures of E-1 to E-91 are found in Claim 11.

[0158] According to one embodiment of the present application, wherein the hydrogen in the structure of compounds E-1 to E-91 can be partially or fully substituted with deuterium.

[0159] According to one embodiment of the present application, wherein in Formula 2, Y1-Y6 is selected from CR y1 , CR y2 or N at each occurrence, and at least one of Y1-Y6 is selected from CR y2 , and the R y2 has the structure of -L1-SiR s1 R s2 R s3 ;

[0160] R s1 , R s2 , R s3each occurrence is 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 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 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 amino with 0-20 carbon atoms, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0161] L1is selected from a single bond, substituted or unsubstituted alkylene with 1-20 carbon atoms, substituted or unsubstituted cycloalkylene with 3-20 carbon atoms, substituted or unsubstituted arylene with 6-20 carbon atoms, substituted or unsubstituted heteroarylene with 3-20 carbon atoms, or combinations thereof;

[0162] adjacent substituents R s1 , R s2 , R s3 may optionally be linked to form a ring.

[0163] Herein, adjacent substituents R s1 , R s2 , R s3 may optionally be linked to form a ring is intended to mean that for any one or more of the adjacent substituent groups, for example, between substituents R s1 and R s2 , between substituents R s1 and R s3 , and between substituents R s2 and R s3 , any one or more of these adjacent substituent groups can be linked to form a ring. Obviously, it is also possible that none of these substituent groups are linked to form a ring. Any adjacent substituents R y1 are not linked to form a ring.

[0164] According to one embodiment of the present application, wherein in formula 2, two of X1-X4are adjacent C, and one of said C is connected to said metal via a carbon-metal bond, the one of X1-X4that is adjacent to said carbon-metal bond is selected from CR x , and R Xselected from the group consisting of deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof.

[0165] In this embodiment, two of X1-X4 are C and one of said C is connected to said metal via a carbon-metal bond, and the one of X1-X4 that is adjacent to said carbon-metal bond is selected from CR x , and said R x is selected from the group of substituents. For example, when said X1 is C and X2 is also C and forms a carbon-metal bond with the metal, then said L a has the structure of , and the one of X1-X4 that is adjacent to said carbon-metal bond is X3, which is selected from CR x , and said R x is selected from the group of substituents. For example, when said X2 in formula 1 is C and X1 is also C and forms a carbon-metal bond with the metal, then said L a has the structure of , and the one of X1-X4 that is adjacent to said carbon-metal bond is not substituted, which is obviously not included in this embodiment.

[0166] According to one embodiment of the present application, wherein in formula 2, at least one of X1-X8 and Y1-Y6 is selected from CR x or CR y1 ; and said R x , R y1each occurrence is the same or different 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 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 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 amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, thiol, sulfinyl, sulfonyl, phosphino, and combinations thereof.

[0167] In this embodiment, at least one of X1-X8and Y1-Y6is selected from CR x or CR y1 , means that at least one of X1-X8is selected from CR x or at least one of Y1-Y6is selected from CR y1 , and said R x , R y1 is the same or different at each occurrence selected from the group of substituents other than hydrogen.

[0168] According to one embodiment of the present application, wherein in formula 2, at least two or three of X1-X8and Y1-Y6are selected from CR x and / or CR y1 ; and said R x , R y1each occurrence is the same or different 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 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 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 amino having 0-20 carbon atoms, acyl, carbonyl, carboxylate, ester, cyano, isocyano, hydroxyl, thiol, sulfinyl, sulfonyl, phosphino, and combinations thereof.

[0169] In this embodiment, at least two or three of X1-X8and Y1-Y6are selected from CR x and / or CR y1 means that at least one of the following is true for X1-X8and Y1-Y6: (1) at least two of X1-X8are selected from CR x ; (2) at least two of Y1-Y6are selected from CR y1 ; (3) at least two of X1-X8are selected from CR x and at least one of Y1-Y6is selected from CR y1 ; (4) at least one of X1-X8is selected from CR x and at least two of Y1-Y6are selected from CR y1 ; (5) at least three of X1-X8are selected from CR x ; (6) at least three of Y1-Y6are selected from CR y1 ; (7) at least one of X1-X8is selected from CR x and at least one of Y1-Y6is selected from CR y1 . And in any of the above cases, the R x , R y1 is the same or different at each occurrence selected from the group of substituents other than hydrogen.

[0170] According to one embodiment of the present application, wherein in the second compound, the L a has a structure represented by Formula 4:

[0171]

[0172] wherein,

[0173] Z is selected from O or S;

[0174] X3-X8are the same or different at each occurrence and are selected from CR x or N;

[0175] Y1-Y6are the same or different at each occurrence and are selected from CR y1 , CR y2 or N; wherein at least one of Y1-Y6is selected from CR y2 , and said R y2 has the structure of -L1-SiR s1 R s2 R s3 ;

[0176] R x , R y1 , R s1 , R s2 , R s3 are the same or different at each occurrence and are 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 heterocyclyl having from 3 to 20 ring 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 amino having from 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, thiol, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0177] L1is selected from a single bond, substituted or unsubstituted alkylene having from 1 to 20 carbon atoms, substituted or unsubstituted cycloalkylene having from 3 to 20 carbon atoms, substituted or unsubstituted arylene having from 6 to 20 carbon atoms, substituted or unsubstituted heteroarylene having from 3 to 20 carbon atoms, and combinations thereof;

[0178] adjacent substituents R x , R s1 , R s2 , R s3 may optionally be linked to form a ring.

[0179] According to one embodiment of the application, wherein said second compound has the structure of M(L a ) m (L b ) n (L c ) q ;

[0180] wherein the metal M is selected from Ir, Rh, Re, Os, Pt, Au or Cu;

[0181] L a , L b and L c are respectively a first ligand, a second ligand and a third ligand of said complex; m is selected from 1, 2 or 3, n is selected from 0, 1 or 2, q is selected from 0, 1 or 2, m+n+q is equal to the oxidation state of the metal M; when m is greater than 1, the plurality of L a may be the same or different; when n is 2, the two L b may be the same or different, when q is 2, the two L c may be the same or different;

[0182] L a , L b and L c may optionally be linked to form a polydentate ligand;

[0183] L b and L c are at each occurrence, identically or differently, selected from the group consisting of the following structures:

[0184]

[0185] wherein R a , R b and R c represent, at each occurrence, identically or differently, a mono-, poly- or no- substitution;

[0186] X b is, at each occurrence, identically or differently, selected from the group consisting of O, S, Se, NR N1 and CR C1 R C2 ;

[0187] X c and X d are, at each occurrence, identically or differently, selected from the group consisting of O, S, Se and NR N2 ;

[0188] R a , R b , R c , R N1 , RN2 , R C1 , and R C2 are each, the same or different at each occurrence, 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 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 amino with 0-20 carbon atoms, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, hydroxyl, thiol, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0189] adjacent substituents R a , R b , R c , R N1 , R N2 , R C1 , and R C2 may optionally be linked to form a ring.

[0190] In the present embodiment, adjacent substituents R a , R b , R c , R N1 , R N2 , R C1 , and R C2 may optionally be linked to form a ring, is intended to mean that among the groups of adjacent substituents, for example, between two substituents R a , between two substituents R b , between two substituents R c , between substituents R a and R b , between substituents R a and R c , between substituents R b and R c , between substituents R a and R N1 , between substituents R b and R N1 , between substituents R a and R C1 , substituents may be linked to form a ring.a and R C2 between R b and R C1 between R b and R C2 between R a and R N2 between R b and R N2 and R C1 and R C2 between any one or more of these groups of substituents can be linked to form a ring. It is obvious that none of these substituents can also be linked to form a ring.

[0191] In the present embodiment, L a , L b and L c may optionally be linked to form a polydentate ligand, which is intended to mean that L a , L b and L c may optionally be linked to form a tetradentate ligand or a hexadentate ligand. It is obvious that none of L a , L b and L c may also be linked to form a polydentate ligand.

[0192] According to one embodiment of the present application, wherein the second compound has a structure of M(L a ) m (L b ) n (L c ) q ;

[0193] wherein the metal M is selected from Ir, Rh, Re, Os, Pt, Au or Cu;

[0194] L a , L b and L c are respectively the first ligand, the second ligand and the third ligand of the complex; m is selected from 1, 2 or 3, n is selected from 0, 1 or 2, q is selected from 0, 1 or 2, m+n+q is equal to the oxidation state of the metal M; when m is greater than 1, the plurality of L a may be the same or different; when n is 2, the two L b may be the same or different, when q is 2, the two L c may be the same or different; L a , L b and L c may optionally be linked to form a polydentate ligand;

[0195] wherein L bEach occurrence is identically or differently selected from the following structures:

[0196]

[0197] X c and X d Each occurrence is identically or differently selected from the group consisting of: O, S, Se and NR N2 ;

[0198] R a1 、R b1 、R c1 、R N2 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted alkyl having 6 to 30 carbon atoms aryloxy, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0199] Adjacent substituent R a1 、R b1 、R c1 can optionally be linked to form a ring;

[0200] L c Each occurrence is identically or differently selected from the group consisting of:

[0201]

[0202] R a 、R b 、R c Each occurrence of the same or different means mono-, poly- or no-substitution;

[0203] X e Each occurrence is identically or differently selected from the group consisting of: O, S, Se and NR N3 ;

[0204] Ra , R b , R c , R N3 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 arylsilane 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;

[0205] adjacent substituents R a , R b , R c may optionally be linked to form a ring.

[0206] In the present embodiment, adjacent substituents R a1 , R b1 , R c1 may optionally be linked to form a ring, is intended to mean that the substituent R a1 and R c1 or the substituent R b1 and R c1 may be linked to form a ring. It is obvious that the substituent R a1 and R c1 or the substituent R b1 and R c1 may also not be linked to form a ring.

[0207] In the present embodiment, adjacent substituents R a , R b , R c may optionally be linked to form a ring, is intended to mean that when there are multiple substituents R a , multiple substituents R b , multiple substituents R c , adjacent substituents R a , adjacent substituents R b , or adjacent substituents R c may be linked to form a ring.to form a ring. It is obvious that, when there are a plurality of substituents R b , adjacent substituents R c , adjacent substituents R a , or adjacent substituents R b , or adjacent substituents R c may also not be connected to form a ring.

[0208] According to one embodiment of the present application, the second compound has a structure represented by Formula 5:

[0209]

[0210] wherein

[0211] m is 1 or 2;

[0212] Z is, on each occurrence, identically or differently selected from O or S; preferably, Z is O;

[0213] X3-X8are, on each occurrence, identically or differently selected from CR x or N;

[0214] Y1-Y6are, on each occurrence, identically or differently selected from CR y1 , CR y2 or N; wherein at least one of Y1-Y6is selected from CR y2 , and said R y2 has the structure of -L1-SiR s1 R s2 R s3 ;

[0215] R x , R y1 , R s1 , R s2 , R s3 , R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R 17each 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 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 amino with 0-20 carbon atoms, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, hydroxyl, thiol, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0216] L1is selected from a single bond, substituted or unsubstituted alkylene with 1-20 carbon atoms, substituted or unsubstituted cycloalkylene with 3-20 carbon atoms, substituted or unsubstituted arylene with 6-20 carbon atoms, substituted or unsubstituted heteroarylene with 3-20 carbon atoms, and combinations thereof;

[0217] adjacent substituents R x , R s1 , R s2 , R s3 may optionally be linked to form a ring;

[0218] adjacent substituents R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R 17 may optionally be linked to form a ring.

[0219] In the present embodiment, adjacent substituents R x , R s1 , R s2 , R s3 may optionally be linked to form a ring, is intended to mean that wherein adjacent groups of substituents, for example, between two substituents R x , between substituents R s1 and R s2 , between substituents R s1 and R s3 , and between substituents R s2 and R s3or more of these substituent groups can be linked to form a ring. Obviously, these substituent groups can also not be linked to form a ring.

[0220] In this context, adjacent substituents R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R 17 optionally linked to form a ring, are intended to mean that, between adjacent substituent groups, for example, substituent R 11 and R 12 , substituent R 11 and R 13 , substituent R 12 and R 13 , substituent R 14 and R 15 , substituent R 15 and R 16 , substituent R 14 and R 16 , substituent R 11 and R 17 , substituent R 12 and R 17 , substituent R 13 and R 17 , substituent R 14 and R 17 , substituent R 15 and R 17 , and substituent R 16 and R 17 , one or more of these substituent groups can be linked to form a ring. Obviously, these substituent groups can also not be linked to form a ring.

[0221] According to one embodiment of the present application, at least one or two of R 11 -R 13 are selected from substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, or combinations thereof; and / or at least one of R 14 -R 16 is substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, or combinations thereof;

[0222] In this context, adjacent substituents R 11 , R 12, R 13 , R 14 , R 15 , R 16 , R 17 may optionally be joined to form a ring.

[0223] According to one embodiment of the application, wherein R 11 - R 13 are each independently 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 a combination thereof; and / or R 14 - R 16 are each independently 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 a combination thereof;

[0224] adjacent substituents R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R 17 may optionally be joined to form a ring.

[0225] According to one embodiment of the application, wherein Y1-Y6 are each independently selected from CR y1 or CR y2 .

[0226] According to one embodiment of the application, wherein at least one of Y1-Y6 is selected from N.

[0227] According to one embodiment of the application, wherein Z is O.

[0228] According to one embodiment of the application, wherein at least one of X3-X8 is selected from N.

[0229] According to one embodiment of the application, wherein one of X3-X8 is selected from N

[0230] According to one embodiment of the application, wherein X8 is N.

[0231] According to one embodiment of the application, wherein X3-X8 are each independently selected from CR x .

[0232] According to one embodiment of the application, wherein X3-X8 are each independently selected from CR x , R xhydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted silylalkyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, cyano, or combinations thereof.

[0233] According to one embodiment of the present application, each X3-X8is independently selected from CR x , the R x is selected from the group consisting of hydrogen, deuterium, fluorine, methyl, ethyl, isopropyl, isobutyl, t-butyl, neopentyl, cyclopentyl, cyclopentylmethyl, cyclohexyl, norbornyl, adamantyl, trimethylsilyl, isopropyldimethylsilyl, phenyldimethylsilyl, trifluoromethyl, cyano, and combinations thereof.

[0234] According to one embodiment of the present application, X3is selected from CR x , and the R x is selected from 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 silylalkyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, cyano, or combinations thereof.

[0235] According to one embodiment of the present application, X3is selected from CR x , and the R x is selected from deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, cyano, or combinations thereof.

[0236] According to one embodiment of the present application, X3is selected from CR x , and the R x is selected from methyl or deuterated methyl.

[0237] According to one embodiment of the present application, Y1-Y2are the same or different at each occurrence selected from CR y1 or N; Y3-Y6are the same or different at each occurrence selected from CR y1 , CR y2 or N, and at least one of Y3-Y6is selected from CR y2 , the R y2 has the structure of -L1-SiR s1 R s2 R s3 .

[0238] R y1each occurrence is independently 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 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 aryl with 6-30 carbon atoms, substituted or unsubstituted heteroaryl with 3-30 carbon atoms, substituted or unsubstituted amino with 0-20 carbon atoms, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, hydroxyl, thiol, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0239] R s1 , R s2 , R s3 each occurrence is independently 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 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 aryl with 6-30 carbon atoms, substituted or unsubstituted heteroaryl with 3-30 carbon atoms, substituted or unsubstituted alkylsilane with 3-20 carbon atoms, substituted or unsubstituted arylsilane with 6-20 carbon atoms, substituted or unsubstituted amino with 0-20 carbon atoms, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, hydroxyl, thiol, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0240] L1is selected from a single bond, substituted or unsubstituted alkylene with 1-20 carbon atoms, substituted or unsubstituted cycloalkylene with 3-20 carbon atoms, substituted or unsubstituted arylene with 6-20 carbon atoms, substituted or unsubstituted heteroarylene with 3-20 carbon atoms, or combinations thereof;

[0241] adjacent substituents R s1 , R s2 , R s3 may optionally be linked to form a ring.

[0242] In this context, adjacent substituents R s1 , R s2 , R s3may optionally be linked to form a ring, is intended to mean that any one or more of these adjacent substituent groups, e.g., substituents R s1 and R s2 , substituents R s1 and R s3 , and substituents R s2 and R s3 may be linked to form a ring. Obviously, none of these substituent groups can also be linked to form a ring. None of the adjacent substituents R y1 are linked to form a ring.

[0243] According to one embodiment of the present application, wherein Y1-Y2is the same or different at each occurrence selected from CR y1 or N; R y1 is the same or different at each occurrence 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 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 amino having from 0-20 carbon atoms, acyl, carbonyl, carboxylate, ester, cyano, isocyano, hydroxy, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof; and when said R y1substituted alkyl, substituted cycloalkyl, substituted heteroalkyl, substituted aralkyl, substituted alkoxy, substituted aryloxy, substituted alkenyl, substituted aryl, substituted heteroaryl, substituted amino, substituted acyl, substituted carbonyl, substituted carboxylic acid, substituted ester, substituted sulfinyl, substituted sulfonyl, and substituted phosphine, means that any one of the alkyl, cycloalkyl, heteroalkyl, aralkyl, alkoxy, aryloxy, alkenyl, aryl, heteroaryl, amino, acyl, carbonyl, carboxylic acid, ester, sulfinyl, sulfonyl, and phosphine groups can be substituted with one or more selected from deuterium, halogen, unsubstituted alkyl of 1 to 20 carbon atoms, unsubstituted cycloalkyl of 3 to 20 ring carbon atoms, unsubstituted heteroalkyl of 1 to 20 carbon atoms, unsubstituted aralkyl of 7 to 30 carbon atoms, unsubstituted alkoxy of 1 to 20 carbon atoms, unsubstituted aryloxy of 6 to 30 carbon atoms, unsubstituted alkenyl of 2 to 20 carbon atoms, unsubstituted alkynyl of 2 to 20 carbon atoms, unsubstituted aryl of 6 to 30 carbon atoms, unsubstituted heteroaryl of 3 to 30 carbon atoms, unsubstituted amino of 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, mercapto, sulfinyl, sulfonyl, phosphine, and combinations thereof.

[0244] According to one embodiment of the present application, wherein R s1 , R s2 , R s3 are each, the same or different, selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl of 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl of 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl of 1 to 20 carbon atoms, substituted or unsubstituted aralkyl of 7 to 30 carbon atoms, substituted or unsubstituted alkoxy of 1 to 20 carbon atoms, substituted or unsubstituted aryloxy of 6 to 30 carbon atoms, substituted or unsubstituted alkenyl of 2 to 20 carbon atoms, substituted or unsubstituted aryl of 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl of 3 to 30 carbon atoms, substituted or unsubstituted alkylsilane of 3 to 20 carbon atoms, substituted or unsubstituted arylsilane of 6 to 20 carbon atoms, substituted or unsubstituted amino of 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphine, and combinations thereof;

[0245] adjacent substituents R s1 , R s2 , R s3 may optionally be linked to form a ring.

[0246] According to one embodiment of the present application, wherein Y1-Y2is, at each occurrence, the same or different, selected from CR y1 or N; Y3-Y6is, at each occurrence, the same or different, selected from CR y1 , CR y2 or N, and at least one of Y3-Y6is selected from CR y2 and said R y2 has the structure of -L-SiR s1 R s2 R s3 ;

[0247] R y1 is, at each occurrence, 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 amino having from 0 to 20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, thiol, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0248] R s1 , R s2 , R s3 is, at each occurrence, the same or different, selected from the group consisting of 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, and combinations thereof;

[0249] L is selected from a single bond, substituted or unsubstituted alkylene having from 1 to 20 carbon atoms, substituted or unsubstituted cycloalkylene having from 3 to 20 carbon atoms, substituted or unsubstituted arylene having from 6 to 20 carbon atoms, substituted or unsubstituted heteroarylene having from 3 to 20 carbon atoms, or combinations thereof;

[0250] adjacent substituents R s1 , Rs2 , R s3 may optionally be joined to form a ring.

[0251] According to one embodiment of the application, Y2is selected from CR y1 or CR y2 ; said R y1 is selected from the group consisting of substituted or unsubstituted alkyl of 1-20 carbon atoms, substituted or unsubstituted cycloalkyl of 3-20 ring carbon atoms, and combinations thereof; said R y2 has the structure of -L1-SiR s1 R s2 R s3 ; R s1 , R s2 , R s3 is selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl of 1-20 carbon atoms, substituted or unsubstituted cycloalkyl of 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl of 1-20 carbon atoms, substituted or unsubstituted aralkyl of 7-30 carbon atoms, substituted or unsubstituted alkoxy of 1-20 carbon atoms, substituted or unsubstituted aryloxy of 6-30 carbon atoms, substituted or unsubstituted alkenyl of 2-20 carbon atoms, substituted or unsubstituted aryl of 6-30 carbon atoms, substituted or unsubstituted heteroaryl of 3-30 carbon atoms, substituted or unsubstituted alkylsilyl of 3-20 carbon atoms, substituted or unsubstituted arylsilyl of 6-20 carbon atoms, substituted or unsubstituted amino of 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, thiol, sulfinyl, sulfonyl, phosphino, and combinations thereof; L1is selected from a single bond, substituted or unsubstituted alkylene of 1-20 carbon atoms, substituted or unsubstituted cycloalkylene of 3-20 carbon atoms, substituted or unsubstituted arylene of 6-20 carbon atoms, substituted or unsubstituted heteroarylene of 3-20 carbon atoms, or combinations thereof;

[0252] adjacent substituents R s1 , R s2 , R s3 may optionally be joined to form a ring.

[0253] According to one embodiment of the application, Y1-Y6are each independently selected from CR y1 or CR y2 , and at least one of Y1-Y6is selected from CR y2 , said R y2 has the structure of -L1-SiR s1 R s2 Rs3 structure, wherein L1is selected from a single bond, R s1 , R s2 , and R s3 are each independently selected from the group consisting of a substituted or unsubstituted alkyl having from 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl having from 3 to 20 ring carbon atoms, a substituted or unsubstituted aryl having from 6 to 30 carbon atoms, and combinations thereof; and at least one or two of R s1 , R s2 , and R s3 are each independently selected from a substituted or unsubstituted alkyl having from 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl having from 3 to 20 ring carbon atoms, or combinations thereof.

[0254] According to one embodiment of the present application, wherein at least one of Y2and Y4is selected from CR y2 , said R y2 has the structure of -L1-SiR s1 R s2 R s3 structure, wherein L1is selected from a single bond, R s1 , R s2 , and R s3 are each independently selected from the group consisting of a substituted or unsubstituted alkyl having from 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl having from 3 to 20 ring carbon atoms, a substituted or unsubstituted aryl having from 6 to 30 carbon atoms, and combinations thereof; and at least one or two of R s1 , R s2 , and R s3 are each independently selected from a substituted or unsubstituted alkyl having from 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl having from 3 to 20 ring carbon atoms, or combinations thereof.

[0255] According to one embodiment of the present application, wherein Y2or Y4is selected from CR y2 , said R y2 has the structure of -L1-SiR s1 R s2 R s3 structure, wherein L1is selected from a single bond, R s1 , R s2 , and R s3 are each independently selected from the group consisting of a substituted or unsubstituted alkyl having from 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl having from 3 to 20 ring carbon atoms, a substituted or unsubstituted aryl having from 6 to 30 carbon atoms, and combinations thereof; and at least one or two of R s1 , R s2 , and R s3at least one or two of R, R, and R are each independently selected from the group consisting of substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, or a combination thereof.

[0256] According to one embodiment of the present application, wherein Y1-Y6are each independently selected from CR y1 or CR y2 and at least one of Y3-Y6is selected from CR y2 , said R y2 has the structure of -L1-SiR s1 R s2 R s3 wherein L1is selected from a single bond, R s1 , R s2 , and R s3 are each independently selected from the group consisting of substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, and combinations thereof; and at least one or two of R s1 , R s2 , and R s3 are each independently selected from the group consisting of substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, or a combination thereof.

[0257] According to one embodiment of the present application, wherein R s1 , R s2 , and R s3 are each independently selected from the group consisting of methyl, ethyl, isopropyl, isobutyl, t-butyl, neopentyl, cyclopentyl, cyclopentylmethyl, cyclohexyl, norbornyl, adamantyl, trifluoromethyl, phenyl, and combinations thereof.

[0258] According to one embodiment of the present application, wherein L a is selected from the group consisting of L a1 to L a319 at each occurrence is the same or different, the specific structures of L a1 to L a319 are found in claim 24.

[0259] According to one embodiment of the present application, wherein L b is selected from the group consisting of L b1 to L b322 at each occurrence is the same or different, L c is selected from the group consisting of L c1 to L c231 at each occurrence is the same or different. b1 b322 ​and L c1 to L c231 The specific structure of L

[0260] According to one embodiment of the present application, wherein the second compound has the structure of Ir(L a )2(L b ) or Ir(L a )2(L c ) or Ir(L a )(L c )2; wherein, when the second compound has the structure of Ir(L a )2(L b ), L a is selected at each occurrence the same or different from any one or any two of the group consisting of L a1 to L a319 , L b is selected from any one of the group consisting of L b1 to L b322 ; when the second compound has the structure of Ir(L a )2(L c ), L a is selected at each occurrence the same or different from any one or any two of the group consisting of L a1 to L a319 , L c is selected from any one of the group consisting of L c1 to L c231 ; when the second compound has the structure of Ir(L a )(L c )2, L a is selected from any one of the group consisting of L a1 to L a319 , L c is selected at each occurrence the same or different from any one or any two of the group consisting of L c1 to L c231 .

[0261] According to one embodiment of the present application, wherein the second compound is selected from the group consisting of Compound 1 to Compound 616, the specific structure of Compound 1 to Compound 616 is shown in Claim 26.

[0262] According to one embodiment of the present application, wherein the organic layer is an emitting layer, the first compound is a host material, and the second compound is an emitting material.

[0263] According to one embodiment of the present application, wherein the device emits red light or white light.

[0264] According to one embodiment of the present application, the organic layer further comprises a third compound having a structure as shown in any one of Formula 3-1 to 3-3:

[0265]

[0266] In Formula 3-1 to 3-3, Ar 31 to Ar 35 is, on each occurrence, identically or differently, selected from a substituted or unsubstituted aryl group having 6-30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3-30 carbon atoms;

[0267] L 31 to L 35 is, on each occurrence, identically or differently, 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;

[0268] X is, on each occurrence, identically or differently, selected from CR x1 R x2 , NR x3 , O, or S;

[0269] R 31 -R 37 is, on each occurrence, identically or differently, mono-substituted, multi-substituted, or un-substituted;

[0270] R 31 -R 37 , R x1 -R x3 is, on each occurrence, identically or differently, 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 heterocyclic 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 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 amino group having 0-20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a thiol group, a sulfinyl group, a sulfonyl group, a phosphine group, and combinations thereof;

[0271] adjacent substituents R 31 -R37 may optionally be linked to form a ring.

[0272] In the present embodiment, adjacent substituents R 31 - R 37 may optionally be linked to form a ring, is intended to mean that any one or more of these groups of adjacent substituents, for example, adjacent substituents R 31 , adjacent substituents R 32 , adjacent substituents R 33 , adjacent substituents R 31 , and adjacent substituents R 32 , and adjacent substituents R 32 , and adjacent substituents R 33 , and adjacent substituents R 34 , and adjacent substituents R 35 , and adjacent substituents R 36 , and adjacent substituents R 37 , and adjacent substituents R 34 , and adjacent substituents R 35 , and adjacent substituents R 35 , and adjacent substituents R 36 , and adjacent substituents R 36 , and adjacent substituents R 37 may be linked to form a ring. Obviously, it is also possible that none of these groups of adjacent substituents are linked to form a ring.

[0273] According to one embodiment of the present application, wherein the organic layer is an emitting layer, the third compound is a host material.

[0274] According to one embodiment of the present application, wherein in formula 3-1, at least one group of adjacent substituents R 31 , R 32 , R 33 is linked to form a ring.

[0275] According to one embodiment of the present application, wherein in formula 3-1, at least one group of adjacent substituents R 31 , R 32 , R 33 is linked to form a ring and the formed ring contains at least one six-membered ring.

[0276] According to one embodiment of the present application, wherein the third compound has a structure represented by one of formula 3-11 to formula 3-21:

[0277]

[0278]

[0279] wherein, in formula 3-11 to formula 3-21,

[0280] Ar 31 each occurrence is the same or different selected from substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms;

[0281] L 31 each occurrence is the same or different selected from a single bond, substituted or unsubstituted arylene having 6-30 carbon atoms, substituted or unsubstituted heteroarylene having 3-30 carbon atoms, or a combination thereof;

[0282] X is, at each occurrence, the same or different selected from CR x1 R x2 , NR x3 , O, or S;

[0283] R 31 , R 32 , R 33 , R 38 each occurrence is the same or different represents mono-substitution, poly-substitution, or no substitution;

[0284] R 31 , R 32 , R 33 , R 38 , R x1 -R x3 is, at 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 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 amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, hydroxyl, thiol, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0285] adjacent substituents R 31 , R 32 , R 33 , R 38 may optionally be linked to form a ring.

[0286] In the present embodiment, adjacent substituents R 31 , R 32 , R 33 , R 38 may optionally be joined to form a ring is intended to mean that any one or more of these groups of adjacent substituents, for example, the group of adjacent substituents R 31 , the group of adjacent substituents R 32 , the group of adjacent substituents R 33 , the group of adjacent substituents R 31 and R 32 , the group of adjacent substituents R 32 and R 33 , the group of adjacent substituents R 31 and R 38 , the group of adjacent substituents R 32 and R 38 , and the group of adjacent substituents R 33 and R 38 may be joined to form a ring. Obviously, it is also possible that none of these groups of adjacent substituents are joined to form a ring.

[0287] According to one embodiment of the present application, wherein in formula 3-11 to 3-21, the R 31 -R 38 is, on each occurrence, identically or differently, selected from the group consisting of hydrogen, deuterium, halogen, cyano, hydroxyl, thiol, substituted or unsubstituted alkyl having 1-20 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, and combinations thereof;

[0288] the L 31 is, on each occurrence, identically or differently, selected from the group consisting of a single bond, substituted or unsubstituted arylene having 6-18 carbon atoms, substituted or unsubstituted heteroarylene having 3-18 carbon atoms, and combinations thereof;

[0289] the Ar 31 , R x1 -R x3 is, on each occurrence, identically or differently, selected from the group consisting of substituted or unsubstituted aryl having 6-18 carbon atoms, substituted or unsubstituted heteroaryl having 3-18 carbon atoms, and combinations thereof.

[0290] According to one embodiment of the present application, wherein in formula 3-11 to 3-21, the R 31 -R 38each occurrence is independently selected from the group consisting of hydrogen, deuterium, fluorine, cyano, hydroxyl, thiol, substituted or unsubstituted alkyl having 1-20 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, and combinations thereof;

[0291] the L 31 each occurrence is independently selected from the group consisting of single bond, phenylene, naphthylene, biphenylene, terphenylene, triphenylene, pyridinylene, thienylene, dibenzofuranylene, dibenzothiophenylene, and combinations thereof;

[0292] the Ar 31 , R x1 -R x3 each occurrence is independently selected from the group consisting of phenyl, deuterated phenyl, methylphenyl, fluorinated phenyl, t-butylphenyl, trideuteromethylphenyl, biphenyl, naphthyl, deuterated naphthyl, dibenzofuranyl, dibenzothiophenyl, 9,9-dimethylfluorenyl, carbazolyl, pyridyl, pyrimidyl, 4-cyanophenyl, 3-cyanophenyl, triphenylenyl, and combinations thereof.

[0293] According to one embodiment of the present application, wherein in Formula 3-1 to 3-3, the R 31 -R 37 each occurrence is independently selected from the group consisting of hydrogen, deuterium, halogen, cyano, hydroxyl, thiol, substituted or unsubstituted alkyl having 1-20 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, and combinations thereof;

[0294] the L 31 to L 35 each occurrence is independently selected from the group consisting of single bond, substituted or unsubstituted arylene having 6-18 carbon atoms, substituted or unsubstituted heteroarylene having 3-18 carbon atoms, and combinations thereof;

[0295] the Ar 31 to Ar 35 , R x1 -R x3 each occurrence is independently selected from the group consisting of substituted or unsubstituted aryl having 6-18 carbon atoms, substituted or unsubstituted heteroaryl having 3-18 carbon atoms, and combinations thereof.

[0296] According to one embodiment of the present application, wherein in Formula 3-1 to 3-3, the R 31 -R37 each occurrence is selected from the group consisting of hydrogen, deuterium, fluorine, cyano, hydroxyl, thiol, methyl, trideuteromethyl, vinyl, phenyl, biphenyl, naphthyl, 4-cyanophenyl, dibenzofuranyl, dibenzothiophenyl, triphenylenyl, carbazolyl, 9-phenylcarbazolyl, 9,9-dimethylfluorenyl, pyridyl, phenylpyridyl, and combinations thereof;

[0297] the L 31 to L 35 is selected from the group consisting of a single bond, phenylene, naphthylene, biphenylene, terphenylene, triphenylenylene, pyridylene, thiophenylene, dibenzofuranylene, dibenzothiophenylene, and combinations thereof;

[0298] the Ar 31 to Ar 35 , R x1 -R x3 each occurrence is selected from the group consisting of phenyl, deuterated phenyl, methylphenyl, fluorinated phenyl, t-butylphenyl, trideuteromethylphenyl, biphenyl, naphthyl, deuterated naphthyl, dibenzofuranyl, dibenzothiophenyl, 9,9-dimethylfluorenyl, carbazolyl, pyridyl, pyrimidyl, 4-cyanophenyl, 3-cyanophenyl, triphenylenyl, and combinations thereof.

[0299] According to one embodiment of the present application, wherein the third compound is selected from the group consisting of compounds H-1 to H-136, the specific structures of which are shown in claim 31.

[0300] According to one embodiment of the present application, wherein the hydrogen in the structure of the compounds H-1 to H-136 can be partially or completely substituted by deuterium.

[0301] According to one embodiment of the present application, a display assembly comprising an electroluminescent device is disclosed, the specific structure of which is shown in any of the preceding embodiments.

[0302] According to one embodiment of the present application, a compound combination comprising at least the first compound and the second compound is also disclosed.

[0303] In the present embodiment, the first compound and the second compound can be further selected from the structures described in any of the preceding embodiments.

[0304] According to one embodiment of the present application, wherein the compound combination further comprises a third compound, the third compound has a structure as shown in any of the preceding embodiments.

[0305] In combination with other materials

[0306] The materials described herein for particular layers in organic light emitting devices can be used in combination with a variety of other materials present in the device. Combinations of these materials are described in detail in US Patent Application US2016 / 0359122A1 at paragraphs 0132-0161, the entirety of which is incorporated by reference herein. The materials described or referenced therein are non-limiting examples of materials that can be used in combination with the compounds disclosed herein, and one of skill in the art can readily identify other materials that can be useful in combination with the compounds disclosed herein.

[0307] The materials described herein for particular layers in organic light emitting devices can be used in combination with a variety of other materials present in the device. Combinations of these materials are described in detail in US Patent Application US2015 / 0349273A1 at paragraphs 0080-0101, the entirety of which is incorporated by reference herein. The materials described or referenced therein are non-limiting examples of materials that can be used in combination with the compounds disclosed herein, and one of skill in the art can readily identify other materials that can be useful in combination with the compounds disclosed herein.

[0308] The present application does not limit the preparation method of the first compound, the second compound and the third compound selected, which can be obtained by the skilled person in the art, or can be easily obtained by referring to the preparation method in the prior art, or can also be obtained by referring to the patent application with the application number of US16481644, US15770215, CN2020114924937, which will not be repeated here.

[0309] The preparation method of the electroluminescent device is not limited, and the preparation method of the following examples is only an example and should not be construed as a limitation. Those skilled in the art can reasonably improve the preparation method of the following examples according to the prior art. For example, the ratio of various materials in the light-emitting layer is not particularly limited, and those skilled in the art can reasonably select within a certain range according to the prior art, for example, based on the total weight of the light-emitting layer material, the host material can account for 80%-99%, and the light-emitting material can account for 1%-20%; or the host material can account for 90%-99%, and the light-emitting material can account for 1%-10%. In addition, the host material can be one or two materials, and the proportion of the two host materials in the host material can be 100:0 to 1:99; or the proportion can be 80:20 to 20:80; or the proportion can be 60:40 to 40:60. In the examples of the device, the characteristics of the device are also tested using conventional devices in the art, including but not limited to evaporation machines produced by Angstrom Engineering, optical test systems, life test systems produced by Suzhou Fosd, ellipsometer produced by Beijing Liangtuo, etc. Since those skilled in the art are aware of the above-mentioned device usage, testing methods and other related content, the inherent data of the sample can be determined and obtained without being affected, therefore the above-mentioned related content will not be expanded in this patent.

[0310] Device Example 1

[0311] First, a glass substrate with a 120 nm thick indium tin oxide (ITO) anode was cleaned, and then treated with UV ozone and oxygen plasma. After treatment, the substrate was dried in a nitrogen-filled glove box to remove moisture, and then the substrate was mounted on a substrate holder and loaded into a vacuum chamber. The organic layers specified below were sequentially evaporated on the ITO anode by thermal vacuum at a rate of -8 Torr. Compound HI was used as a hole injection layer (HIL), with a thickness of Compound HT was used as a hole transport layer (HTL), with a thickness of Compound EB was used as an electron blocking layer (EBL), with a thickness of Compound E-9 as the first host, compound H-35 as the second host, and compound 250 as the dopant were co-evaporated as the light-emitting layer (EML), with a thickness of Compound HB was used as a hole blocking layer (HBL), with a thickness of On the hole blocking layer, compound ET and 8-hydroxyquinoline-lithium (Liq) were co-evaporated as an electron transport layer (ETL), with a thickness of Finally, compound Liq was evaporated as an electron injection layer (EIL), with a thickness of ​8-hydroxyquinoline-lithium (Liq) having a thickness of 8 nm as an electron injection layer (EIL), and aluminum evaporated as a cathode. The device was then transferred back into the glove box and encapsulated with a glass cap to complete the device.

[0312] Device Example 2

[0313] The implementation of Device Example 2 was identical to that of Device Example 1, except that Compound 323 was used instead of Compound 250 as a dopant in the light-emitting layer (EML).

[0314] Device Example 3

[0315] The implementation of Device Example 2 was identical to that of Device Example 1, except that Compound 323 was used instead of Compound 250 as a dopant in the light-emitting layer (EML).

[0316] Device Example 4

[0317] The implementation of Device Example 2 was identical to that of Device Example 1, except that Compound 323 was used instead of Compound 250 as a dopant in the light-emitting layer (EML).

[0318] Device Example 5

[0319] The implementation of Device Example 5 was identical to that of Device Example 1, except that Compound 484 was used instead of Compound 250 as a dopant in the light-emitting layer (EML).

[0320] Device Comparative Example 1

[0321] The implementation of Device Comparative Example 1 was identical to that of Device Example 1, except that Compound RH-A was used instead of Compound E-9 and Compound H-35 as a host in the light-emitting layer (EML), and Compound 484 was used instead of Compound 250 as a dopant (the weight ratio of Compound RH-A to Compound 484 was 98:2).

[0322] Device Comparative Example 2

[0323] The implementation of Device Comparative Example 2 was identical to that of Device Example 1, except that Compound RH-A was used instead of Compound E-9 and Compound H-35 as a host in the light-emitting layer (EML) (the weight ratio of Compound RH-A to Compound 250 was 98:2).

[0324] Device Comparative Example 3

[0325] The implementation of Device Comparative Example 3 was identical to that of Device Example 2, except that Compound RH-A was used instead of Compound E-9 and Compound H-35 as a host in the light-emitting layer (EML) (the weight ratio of Compound RH-A to Compound 182 was 98:2).

[0326] Device Comparative Example 4

[0327] The device comparative example 4 was implemented in the same manner as the device example 3, except that compound RH-A was used instead of compound E-9 and compound H-35 as the host in the light-emitting layer (EML) (the weight ratio of compound RH-A to compound 323 was 98:2).

[0328] Device Comparative Example 5

[0329] The device comparative example 5 was implemented in the same manner as the device example 4, except that compound RH-A was used instead of compound E-9 and compound H-35 as the host in the light-emitting layer (EML) (the weight ratio of compound RH-A to compound 360 was 98:2).

[0330] The device layer structure and thickness are shown in the following table. Where more than one material is used, the different compounds are doped in the weight ratio as reported.

[0331] Table 1 Device structure of device examples and comparative examples

[0332]

[0333]

[0334] The material structure used in the device is shown as follows:

[0335]

[0336]

[0337] The IVL characteristics of the device were measured. Table 2 shows the voltage (V) and external quantum efficiency (EQE) data measured at 15 mA / cm2current density. 2

[0338] Table 2 Device data

[0339] Device No. Voltage (V) EQE (%) Example 1 3.45 26.19 Example 2 3.97 24.50 Example 3 3.63 23.94 Example 4 3.56 26.68 Example 5 3.50 22.86 Comparative Example 1 3.94 19.65 Comparative Example 2 4.11 22.81 Comparative Example 3 3.81 20.14 Comparative Example 4 4.01 20.85 Comparative Example 5 4.34 25.14

[0340] ​In Table 2, a comparison of the data of Examples 1 to 4 with Comparative Examples 2 to 5 shows that the Examples have significantly improved the high EQE level of the Comparative Examples, reaching a very high level. This fully demonstrates that the combination of the host compound and the light-emitting dopant compound selected by the present invention has the excellent property of significantly improving EQE. In addition, a comparison of the voltage data of Examples 1 to 4 and Comparative Examples 2 to 5 can also fully demonstrate the low voltage advantage of the combination of the first compound and the second compound described in the present invention. In addition, from the comparison of Example 5 and Comparative Example 1, it can be seen that the EQE improvement of Example 5 is as high as 16.2%, and Example 5 also has a lower voltage than Comparative Example 1. This result once again confirms that the combination of the first compound and the second compound selected by the present invention can bring about a significant improvement in EQE and a unique advantage of reducing voltage. These results show that the combination of the first compound and the second compound of the present invention can achieve a significant improvement in device performance, proving the superiority of the combination of the first compound and the second compound of the present invention.

[0341] In summary, the combination of the first compound and the second compound disclosed in the present invention can exhibit excellent comprehensive device performance in the device, such as lower driving voltage and higher efficiency, because the two types of compounds can be well matched with each other in energy, and has good commercial development potential.

[0342] It should be understood that the various embodiments described herein are merely examples and are not intended to limit the scope of the present invention. Therefore, as will be apparent to those skilled in the art, the claimed invention may include variations of the specific embodiments and preferred embodiments described herein. Many of the materials and structures described herein can be replaced with other materials and structures without departing from the spirit of the present invention. It should be understood that the various theories regarding why the present invention works are not intended to be restrictive.

Claims

1. An electroluminescent device comprising: anode, cathode, and an organic layer disposed between the anode and the cathode, wherein the organic layer comprises at least a first compound and a second compound; The organic layer is a light-emitting layer, the first compound is a host material, and the second compound is a light-emitting material; The first compound has a structure represented by Formula 1a: In formula 1a, A1-A 10 Each independently selected from C, CR A or N; and A1-A 10 3 of them are C; 2 of them are adjacent and connected to the structure represented by Formula 1b; the other C is connected to the structure represented by Formula 1c: * respectively represent the position where Formula 1b is connected to Formula 1a, and the position where Formula 1c is connected to Formula 1a; Ar is selected from a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, or a combination thereof; L is selected from a single bond, a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 30 carbon atoms, or a combination thereof; V is selected from NR2, O or S; R A , R1, R2 are each identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted alkyl having 6 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof; Adjacent substituent R A , R1 and R2 can be optionally linked to form a ring; The second compound is a metal complex comprising a ligand L coordinated with the metal a , and the metal is selected from metals with a relative atomic mass greater than 40; L a Having a structure represented by Formula 2: In Formula 2, Z is selected from O, S or Se; Each occurrence of X1-X8 is selected from C, CR x or N; Each occurrence of Y1-Y6 is identical or different and is selected from CR y1 , CR y2 or N; said R y2 With-L1-SiR s1 R s2 R s3 structure; R x , R y1 , R s1 , R s2 , R s3 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted alkyl having 6 to 30 carbon atoms aryloxy, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof; L1 is selected from a single bond, a substituted or unsubstituted alkylene group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkylene group having 3 to 20 carbon atoms, a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 20 carbon atoms, or a combination thereof; Adjacent substituent R x , R s1 , R s2 , R s3 can optionally be linked to form a ring; Any adjacent substituent R y1 None of them connect to form a ring.

2. The electroluminescent device according to claim 1, wherein the first compound has a structure represented by one of Formula 1a-1 to Formula 1a-6: In Formulas 1a-1 to 1a-6, A1-A 10 Each occurrence is selected from C, CR A or N; and A1-A 10 One of them is C and is connected to the structure represented by formula 1c, which is the same as that described in claim 1; V is selected from NR2, O or S; R A , R1, R2 are each identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted alkyl having 6 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof; Adjacent substituent R A , R1 and R2 can be optionally linked to form a ring. The electroluminescent device according to claim 2 , wherein V in Formulae 1a-1 to 1a-6 is selected from O or S. The electroluminescent device according to claim 3 , wherein V in Formula 1a-1 to Formula 1a-6 is O.

5. The electroluminescent device according to claim 2, wherein the R A , R1 and R2, at each occurrence, are identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, and combinations thereof.

6. The electroluminescent device according to claim 5, wherein the R A and R1, at each occurrence, is the same or different and selected from the group consisting of hydrogen, deuterium, fluorine, cyano, hydroxyl, mercapto, methyl, trideuterated methyl, vinyl, phenyl, biphenyl, naphthyl, 4-cyanophenyl, dibenzofuranyl, dibenzothiophenyl, triphenylene, carbazolyl, 9-phenylcarbazolyl, 9,9-dimethylfluorenyl, pyridyl, phenylpyridyl, and combinations thereof.

7. The electroluminescent device according to claim 1, wherein Ar in Formula 1c has a structure represented by one of Formulas 1c-1 to 1c-3: in, In formula 1c-1, each occurrence of B1-B6 is identical or different and is selected from C, CR B or N; In formula 1c-2, each occurrence of B1-B8 is identical or different and is selected from C, CR B or N; In formula 1c-3, each occurrence of B1-B8 is identical or different and is selected from C, CR B or N; G is selected from CR g R g , SiR g R g ,NR g , BR g , PR g , O, S or Se; when there are two R g When two R g Can be the same or different; R B , R g each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, and its combination; "︴" indicates the position where the Ar structure is connected to the L in Formula 1c; Adjacent substituent R B and R g Can optionally be linked to form a ring.

8. The electroluminescent device according to claim 7, wherein Ar in Formula 1c has a structure represented by one of Formulas 1c-11 to 1c-20: In Formula 1c-11 to Formula 1c-20, B1-B n Each occurrence is the same or different selection from CR B or N; said B n Corresponding to B1-B 12 The largest numbered one in any of formulas 1c-11 to 1c-20, G is selected from CR the same or different each time it appears. g R g , SiR g R g ,NR g , BR g , PR g , O, S or Se; when there are two R g When two R g Can be the same or different; R B , R g each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, and its combination; "︴" indicates the position where the Ar structure is connected to the L in Formula 1c; Adjacent substituent R B and R g Can optionally be linked to form a ring.

9. The electroluminescent device according to claim 8, wherein in formula 1c-11, at least one of B1, B3, and B5 is N, and the others are independently selected from CR B or N; B1-B in formulas 1c-12 to 1c-20 n At least one of them is N, the B n Corresponding to B1-B 12 The largest numbered one in any one of Formulas 1c-12 to 1c-20, and the rest are independently selected from CR B or N.

10. The electroluminescent device according to claim 8, wherein in formula 1c-11, two or three of B1, B3, and B5 are N, and the others are independently selected from CR B ; B1-B in formulas 1c-12 to 1c-20 n At least two of them are N, the B n Corresponding to B1-B 12 The largest numbered one in any one of Formulas 1c-12 to 1c-20, and the rest are independently selected from CR B .

11. The electroluminescent device according to claim 8, wherein the R B Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, and combinations thereof.

12. The electroluminescent device according to claim 11, wherein the R B Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, methyl, trideuterated methyl, vinyl, phenyl, biphenyl, naphthyl, 4-cyanophenyl, dibenzofuranyl, dibenzothiophenyl, triphenylene, carbazolyl, 9-phenylcarbazolyl, 9,9-dimethylfluorenyl, pyridyl, phenylpyridyl, and combinations thereof.

13. The electroluminescent device according to claim 8, wherein B1-B in Formula 1c-11 to Formula 1c-20 n At least one is CR B , the B n Corresponding to B1-B 12 The largest serial number in any one of Formulas 1c-11 to 1c-20, and the R B Selected from the group consisting of deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl having 1-20 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, and combinations thereof.

14. The electroluminescent device according to claim 13, wherein B1-B in Formula 1c-11 to Formula 1c-20 n At least one is CR B , the B n Corresponding to B1-B 12 The largest serial number in any one of Formulas 1c-11 to 1c-20, and the R B Selected from the group consisting of deuterium, methyl, trideuterated methyl, vinyl, phenyl, biphenyl, naphthyl, 4-cyanophenyl, dibenzofuranyl, dibenzothiophenyl, triphenylene, carbazolyl, 9-phenylcarbazolyl, 9,9-dimethylfluorenyl, pyridyl, phenylpyridyl, and combinations thereof.

15. The electroluminescent device of claim 1, wherein the Ar is selected from the group consisting of: in, Optionally, hydrogen in the above structures can be partially or fully replaced by deuterium.

16. The electroluminescent device according to claim 1, wherein The L is selected from the group consisting of a single bond, a substituted or unsubstituted arylene group of 6 to 18 carbon atoms, a substituted or unsubstituted heteroarylene group of 3 to 18 carbon atoms, and combinations thereof.

17. The electroluminescent device of claim 16, wherein L is selected from the group consisting of a single bond, a phenylene group, a naphthylene group, a biphenylene group, a terphenylene group, a triphenylene group, a pyridylene group, a thienylene group, a dibenzofuranylene group, a dibenzothienylene group, and combinations thereof.

18. The electroluminescent device according to claim 1, wherein The first compound is selected from the group consisting of the following structures: Optionally, the hydrogen in the above structure can be partially or completely replaced by deuterium.

19. The electroluminescent device according to claim 1, wherein in Formula 2, Y1-Y6 are selected from CR y1 , CR y2 or N, at least one of Y1-Y6 is selected from CR y2 , and the R y2 With-L1-SiR s1 R s2 R s3 structure; R s1 , R s2 , R s3 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted an alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof; L1 is selected from a single bond, a substituted or unsubstituted alkylene group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkylene group having 3 to 20 carbon atoms, a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 20 carbon atoms, or a combination thereof; Adjacent substituent R s1 , R s2 , R s3 Can optionally be linked to form a ring.

20. The electroluminescent device of claim 1, wherein: In Formula 2, two adjacent ones of X1-X4 are C, and one of the Cs is connected to the metal via a carbon-metal bond, and the one of X1-X4 adjacent to the carbon-metal bond is selected from CR x , and R X selected from deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted an alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof.

21. The electroluminescent device of claim 1, wherein: In Formula 2, at least one of X1-X8 and Y1-Y6 is selected from CR x or CR y1 ; and said R x , R y1 Each occurrence is identically or differently selected from the group consisting of: deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aromatic hydrocarbons having 6 to 30 carbon atoms, oxy group, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof.

22. The electroluminescent device of claim 21, wherein At least two or three of X1-X8 and Y1-Y6 are selected from CR x and / or CR y1 ; and said R x , R y1 Each occurrence is identically or differently selected from the group consisting of: deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aromatic hydrocarbons having 6 to 30 carbon atoms, oxy group, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof.

23. The electroluminescent device of claim 1, wherein: In the second compound, the L a Having a structure represented by Formula 4: in, Z is selected from O or S; Each occurrence of X3-X8 is the same or different selection from CR x or N; Each occurrence of Y1-Y6 is identical or different and is selected from CR y1 , CR y2 or N; wherein at least one of Y1-Y6 is selected from CR y2 , and the R y2 With-L1-SiR s1 R s2 R s3 structure; R x , R y1 , R s1 , R s2 , R s3 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted alkyl having 6 to 30 carbon atoms aryloxy, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof; L1 is selected from a single bond, a substituted or unsubstituted alkylene group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkylene group having 3 to 20 carbon atoms, a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 20 carbon atoms, and combinations thereof; Adjacent substituent R x , R s1 , R s2 , R s3 Can optionally be linked to form a ring.

24. The electroluminescent device of claim 23, wherein The second compound has M(L a ) m (L b ) n (L c ) q structure; wherein the metal M is selected from Ir, Rh, Re, Os, Pt, Au or Cu; L a 、L b and L c are the first ligand, the second ligand and the third ligand of the complex respectively; m is selected from 1, 2 or 3, n is selected from 0, 1 or 2, q is selected from 0, 1 or 2, m+n+q is equal to the oxidation state of the metal M; when m is greater than 1, multiple L a Can be the same or different; when n is 2, the two L b Can be the same or different. When q is 2, the two L c Can be the same or different; L a 、L b and L c can optionally be linked to form multidentate ligands; L b and L c Each occurrence is identically or differently selected from the group consisting of: Among them, Ra, R b and R c Each occurrence of the same or different means mono-, poly- or no-substitution; X b Each occurrence is identically or differently selected from the group consisting of: O, S, Se, NR N1 and CR C1 R C2 ; X c and X d Each occurrence is identically or differently selected from the group consisting of: O, S, Se and NR N2 ; R a 、R b 、R c 、R N1 、R N2 、R C1 and R C2 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted alkyl having 6 to 30 carbon atoms aryloxy, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof; Adjacent substituent R a 、R b 、R c 、R N1 、R N2 、R C1 and R C2 Can optionally be linked to form a ring.

25. The electroluminescent device of claim 23, wherein The second compound has M(L a ) m (L b ) n (L c ) q structure; wherein the metal M is selected from Ir, Rh, Re, Os, Pt, Au or Cu; L a 、L b and L c are the first ligand, the second ligand and the third ligand of the complex respectively; m is selected from 1, 2 or 3, n is selected from 0, 1 or 2, q is selected from 0, 1 or 2, m+n+q is equal to the oxidation state of the metal M; when m is greater than 1, multiple L a Can be the same or different; when n is 2, the two L b Can be the same or different. When q is 2, the two L c Can be the same or different; L a 、L b and L c can optionally be linked to form multidentate ligands; Among them, L b Each occurrence is identically or differently selected from the following structures: X c and X d Each occurrence is identically or differently selected from the group consisting of: O, S, Se and NR N2 ; R a1 、R b1 、R c1 、R N2 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted alkyl having 6 to 30 carbon atoms aryloxy, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof; Adjacent substituent R a1 、R b1 、R c1 can optionally be linked to form a ring; L c Each occurrence is identically or differently selected from the group consisting of: R a 、R b 、R c Each occurrence of the same or different means mono-, poly- or no-substitution; X e Each occurrence is identically or differently selected from the group consisting of: O, S, Se and NR N3 ; R a 、R b 、R c 、R N3 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted alkyl having 6 to 30 carbon atoms aryloxy, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof; Adjacent substituent R a 、R b 、R c Can optionally be linked to form a ring.

26. The electroluminescent device of claim 23, wherein: The second compound has a structure represented by Formula 5: in, m is 1 or 2; Each occurrence of Z is the same or different and is selected from O or S; each occurrence of X3-X8 is the same or different and is selected from CR x or N; Each occurrence of Y1-Y6 is identical or different and is selected from CR y1 , CR y2 or N; wherein at least one of Y1-Y6 is selected from CR y2 , and the R y2 With-L1-SiR s1 R s2 R s3 structure; R x , R y1 , R s1 , R s2 , R s3 , R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R 17 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted alkyl having 6 to 30 carbon atoms aryloxy, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof; L1 is selected from a single bond, a substituted or unsubstituted alkylene group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkylene group having 3 to 20 carbon atoms, a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 20 carbon atoms, and combinations thereof; Adjacent substituent R x , R s1 , R s2 , R s3 can optionally be linked to form a ring; Adjacent substituent R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R 17 Can optionally be linked to form a ring.

27. The electroluminescent device of claim 26, wherein R 11 -R 13 At least one or two of them are selected from substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 1 to 20 carbon atoms, or combinations thereof; and / or R 14 -R 16 At least one of the groups is a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted heteroalkyl group having 1 to 20 carbon atoms, or a combination thereof.

28. The electroluminescent device of claim 26, wherein R 11 -R 13 At least two of them are selected from substituted or unsubstituted alkyl groups having 2 to 20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 2 to 20 carbon atoms, or a combination thereof; and / or R 14 -R 16 At least two of them are selected from substituted or unsubstituted alkyl groups having 2 to 20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 2 to 20 carbon atoms, or combinations thereof.

29. The electroluminescent device of claim 23, wherein Y1-Y6 are each independently selected from CR y1 or CR y2 .

30. The electroluminescent device of claim 23, wherein Z is O.

31. The electroluminescent device of claim 23, wherein: Each occurrence of Y1-Y2 is the same or different and is selected from CR y1 or N; Y3-Y6 are each selected from CR y1 , CR y2 or N, and at least one of Y3-Y6 is selected from CR y2 , the R y2 With-L1-SiR s1 R s2 R s3 structure; R y1 each occurrence being identically or differently 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 amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxy, thiol, sulfinyl, sulfonyl, phosphino, and combinations thereof; R s1 , R s2 , R s3 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted an alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof; L1 is selected from a single bond, a substituted or unsubstituted alkylene group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkylene group having 3 to 20 carbon atoms, a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 20 carbon atoms, or a combination thereof.

32. The electroluminescent device of claim 31, wherein R s1 , R s2 , R s3 Each occurrence is identically or differently selected from the group consisting of substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, and combinations thereof.

33. The electroluminescent device of claim 23, wherein Y1-Y6 are each independently selected from CR y1 or CR y2 , and at least one of Y1-Y6 is selected from CR y2 , the R y2 With-L1-SiR s1 R s2 R s3 The structure wherein L1 is selected from a single bond, R s1 、R s2 and R s3 are each independently selected from the group consisting of a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, and combinations thereof; and R s1 、R s2 and R s3 At least one or two of the groups are independently selected from a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, or a combination thereof.

34. The electroluminescent device of claim 33, wherein at least one of Y2 and Y4 is selected from CR y2 .

35. The electroluminescent device of claim 33, wherein Y2 or Y4 is selected from CR y2 .

36. The electroluminescent device of claim 26, wherein: R s1 、R s2 and R s3 Each is independently selected from the group consisting of methyl, ethyl, isopropyl, isobutyl, tert-butyl, neopentyl, cyclopentyl, cyclopentylmethyl, cyclohexyl, norbornyl, adamantyl, trifluoromethyl, phenyl, and combinations thereof.

37. The electroluminescent device of claim 24, wherein L a Each occurrence is identically or differently selected from the group consisting of:

38. The electroluminescent device of claim 37, wherein L b Each occurrence is identically or differently selected from the group consisting of: in, L c Each occurrence is identically or differently selected from the group consisting of:

39. The electroluminescent device of claim 38, wherein The second compound has Ir(L a )2(L b ) or Ir(L a )2(L c ) or Ir(L a )(L c )2 structure; Wherein, when the second compound has Ir(L a )2(L b ) structure, L a Each time it appears, the same or different selection is made from L a1 To L a319 Any one or two of the group consisting of L b Choose from L b1 To L b322 When the second compound has Ir(L a )2(L c ) structure, L a Each time it appears, the same or different selection is made from L a1 To L a319 Any one or two of the group consisting of L c Choose from L c1 To L c231 When the second compound has Ir(L a )(L c )2 structure, L a Choose from L a1 To L a319 Any one of the group consisting of L c Each time it appears, the same or different selection is made from L c1 To L c231 Any one or any two of the group consisting of.

40. The electroluminescent device of claim 39, wherein The second compound is selected from the group consisting of Compound 1 to Compound 616; wherein Compounds 1 to 496 have Ir(L a )2(L b ) structure, where two L a Same, L a and L b They correspond to the structures listed in the following table: Among them, compounds 497 to 616 have Ir(L a )2(L b ) structure, where two L a Different, L a and L b They correspond to the structures listed in the following table:

41. The electroluminescent device of claim 1, which emits red or white light.

42. The electroluminescent device according to claim 1, wherein the organic layer further comprises a third compound having a structure as shown in any one of Formula 3-1 to Formula 3-3: In formulas 3-1 to 3-3, Ar 31 to Ar 35 is selected, identically or differently on each occurrence, from a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, or a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms; L 31 To L 35 is identically or differently selected at each occurrence from a single bond, a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 30 carbon atoms, or a combination thereof; Each occurrence of X is selected from CR x1 R x2 NR x3 , O or S; R 31 -R 37 Each occurrence of the same or different means mono-, poly- or no-substitution; R 31 -R 37 、R x1 -R x3 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted alkyl having 6 to 30 carbon atoms aryloxy, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof; Adjacent substituent R 31 -R 37 Can optionally be linked to form a ring.

43. The electroluminescent device of claim 42, wherein the third compound is a host material.

44. The electroluminescent device of claim 43, wherein In formula 3-1, the adjacent substituents R 31 、R 32 、R 33 There is at least one set of connections that form a ring.

45. The electroluminescent device according to claim 44, wherein in formula 3-1, the adjacent substituents R 31 、R 32 、R 33 There is at least one group of groups connected to form a ring and the formed ring contains at least one six-membered ring.

46. ​​The electroluminescent device according to claim 44, wherein the third compound has a structure represented by one of Formula 3-11 to Formula 3-21: in, In formula 3-11 to formula 3-21, Ar 31 are selected, identically or differently on each occurrence, from substituted or unsubstituted aryl groups having 6 to 30 carbon atoms, and substituted or unsubstituted heteroaryl groups having 3 to 30 carbon atoms; L 31 is identically or differently selected at each occurrence from a single bond, a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 30 carbon atoms, or a combination thereof; Each occurrence of X is selected from CR x1 R x2 NR x3 , O or S; R 31 、R 32 、R 33 、R 38 Each occurrence of the same or different means mono-, poly- or no-substitution; R 31 、R 32 、R 33 、R 38 、R x1 -R x3 The alkyl radicals are selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl radicals having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl radicals having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl radicals having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl radicals having 3 to 20 ring carbon atoms, substituted or unsubstituted aralkyl radicals having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy radicals having 1 to 20 carbon atoms, substituted or unsubstituted aromatic radicals having 6 to 30 carbon atoms, oxy group, substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, substituted or unsubstituted aryl group having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, substituted or unsubstituted amino group having 0 to 20 carbon atoms, acyl group, carbonyl group, carboxylic acid group, ester group, cyano group, isocyano group, hydroxyl group, mercapto group, sulfinyl group, sulfonyl group, phosphino group, and combinations thereof; Adjacent substituent R 31 、R 32 、R 33 、R 38 Can optionally be linked to form a ring.

47. The electroluminescent device of claim 46, wherein: The R 31 -R 38 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, and combinations thereof; The L 31 To L 35 Each occurrence is identically or differently selected from the group consisting of a single bond, a substituted or unsubstituted arylene group of 6 to 18 carbon atoms, a substituted or unsubstituted heteroarylene group of 3 to 18 carbon atoms, and combinations thereof; The Ar 31 to Ar 35 、R x1 -R x3 Each occurrence is identically or differently selected from the group consisting of substituted or unsubstituted aryl having 6 to 18 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 18 carbon atoms, and combinations thereof.

48. The electroluminescent device of claim 47, wherein said R 31 -R 38 each occurrence being identically or differently selected from the group consisting of hydrogen, deuterium, fluorine, cyano, hydroxyl, mercapto, methyl, trideuterated methyl, vinyl, phenyl, biphenyl, naphthyl, 4-cyanophenyl, dibenzofuranyl, dibenzothiophenyl, triphenylene, carbazolyl, 9-phenylcarbazolyl, 9,9-dimethylfluorenyl, pyridyl, phenylpyridyl, and combinations thereof; The L 31 To L 35 selected from the group consisting of a single bond, phenylene, naphthylene, biphenylene, terphenylene, triphenylene, pyridylene, thienylene, dibenzofuranylene, dibenzothienylene, and combinations thereof; The Ar 31 to Ar 35 、R x1 -R x3 Each occurrence is identically or differently selected from the group consisting of phenyl, deuterated phenyl, methylphenyl, fluorophenyl, tert-butylphenyl, trideuterated methylphenyl, biphenyl, naphthyl, deuterated naphthyl, dibenzofuranyl, dibenzothiophenyl, 9,9-dimethylfluorenyl, carbazolyl, pyridyl, pyrimidinyl, 4-cyanophenyl, 3-cyanophenyl, triphenylene, and combinations thereof.

49. The electroluminescent device of claim 42, wherein: The third compound is selected from the group consisting of the following structures: Optionally, the hydrogen in the above structure can be partially or completely replaced by deuterium.

50. A display assembly comprising the electroluminescent device according to any one of claims 1 to 49.

51. A compound combination comprising at least a first compound and a second compound; The first compound has a structure represented by Formula 1a: In Formula 1a, A1-A 10 Each independently selected from C, CR A or N; and A1-A 10 3 of them are C; 2 of them are adjacent and connected to the structure represented by Formula 1b; the other C is connected to the structure represented by Formula 1c: * respectively represent the position where Formula 1b is connected to Formula 1a, and the position where Formula 1c is connected to Formula 1a; Ar is selected from a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, or a combination thereof; L is selected from a single bond, a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 30 carbon atoms, or a combination thereof; V is selected from NR2, O or S; R A , R1, R2 are each identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted alkyl having 6 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof; Adjacent substituent R A , R1 and R2 can be optionally linked to form a ring; The second compound is a metal complex comprising a ligand L coordinated with the metal a , and the metal is selected from metals with a relative atomic mass greater than 40; L a Having a structure represented by Formula 2: In Formula 2, Z is selected from O, S or Se; Each occurrence of X1-X8 is selected from C, CR x or N; Each occurrence of Y1-Y6 is identical or different and is selected from CR y1 , CR y2 or N; said R y2 With-L1-SiR s1 R s2 R s3 structure; R x , R y1 , R s1 , R s2 , R s3 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted alkyl having 6 to 30 carbon atoms aryloxy, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof; L1 is selected from a single bond, a substituted or unsubstituted alkylene group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkylene group having 3 to 20 carbon atoms, a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 20 carbon atoms, or a combination thereof; Adjacent substituent R x , R s1 , R s2 , R s3 can optionally be linked to form a ring; Any adjacent substituent R y1 None of them connect to form a ring.

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