CN114678485A

CN114678485A - Electroluminescent device

Info

Publication number: CN114678485A
Application number: CN202011546486.0A
Authority: CN
Inventors: 邝志远; 张晗; 张奇; 王乐; 王强; 谢梦兰
Original assignee: Beijing Summer Sprout Technology Co Ltd
Current assignee: Beijing Summer Sprout Technology Co Ltd
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2022-06-28

Abstract

An electroluminescent device is disclosed. The electroluminescent device includes an anode, a cathode, and an organic layer disposed between the anode and the cathode, the organic layer including a first compound having a structure of formula 1a and a second compound having a ligand structure of formula 2. The novel material combination can enable an electroluminescent device to obtain lower voltage and higher efficiency, and can provide better device performance. Also disclosed is a display module comprising the electroluminescent device, and a combination of compounds of a first compound having a partial structure of formula 1a and a second compound having a ligand structure of formula 2.

Description

Electroluminescent device

Technical Field

The present invention relates to electronic devices, such as electroluminescent devices. More particularly, it relates to a first compound comprising a phenanthrooxazole having a structure represented by formula 1a and the like in an organic layer and a ligand L having a structure represented by formula 2_aThe second compound of (a) above.

Background

Organic electronic devices include, but are not limited to, the following classes: organic Light Emitting Diodes (OLEDs), organic field effect transistors (O-FETs), Organic Light Emitting Transistors (OLETs), Organic Photovoltaics (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 plasma light emitting devices.

In 1987, Tang and Van Slyke of Islamic Kodak reported a two-layer organic electroluminescent device comprising an arylamine hole transport layer and a tris-8-hydroxyquinoline-aluminum layer as an electron transport layer and a light-emitting layer (Applied Physics Letters, 1987,51(12): 913-915). Upon biasing the device, green light is emitted from the device. The invention lays a foundation for the development of modern Organic Light Emitting Diodes (OLEDs). The most advanced OLEDs may comprise 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 a self-emissive solid state device, it offers great potential for display and lighting applications. Furthermore, the inherent properties of organic materials, such as their flexibility, may make them well suited for particular applications, such as in the fabrication of flexible substrates.

OLEDs can be classified into three different types according to their light emitting mechanisms. The OLEDs invented by Tang and van Slyke are fluorescent OLEDs. It uses only singlet luminescence. The triplet states generated in the device are wasted through the non-radiative decay channel. Therefore, the Internal Quantum Efficiency (IQE) of fluorescent OLEDs is only 25%. This limitation hinders the commercialization of OLEDs. In 1997, Forrest and Thompson reported phosphorescent OLEDs, which use triplet emission from complex-containing heavy metals as emitters. Thus, singlet and triplet states can be harvested, achieving 100% IQE. Due to its high efficiency, the discovery and development of phosphorescent OLEDs directly contributes to the commercialization of active matrix OLEDs (amoleds). Recently, Adachi achieved high efficiency through Thermally Activated Delayed Fluorescence (TADF) of organic compounds. These emitters have a small singlet-triplet gap, making it possible for excitons to return from the triplet state to the singlet state. In TADF devices, triplet excitons are able to generate singlet excitons through reverse intersystem crossing, resulting in high IQE.

OLEDs can also be classified into small molecule and polymer OLEDs depending on the form of the material 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 they have a precise structure. Dendrimers with well-defined structures are considered small molecules. The polymeric OLED comprises a conjugated polymer and a non-conjugated polymer having a pendant light-emitting group. Small molecule OLEDs can become polymer OLEDs if post-polymerization occurs during the fabrication process.

Various OLED manufacturing methods exist. Small molecule OLEDs are typically fabricated by vacuum thermal evaporation. Polymer OLEDs are fabricated by solution processes such as spin coating, ink jet printing and nozzle printing. Small molecule OLEDs can also be made by solution processes if the material can be dissolved or dispersed in a solvent.

The light emitting color of the OLED can be realized by the structural design of the light emitting material. An OLED may comprise one light emitting layer or a plurality of light emitting layers to achieve a desired spectrum. Green, yellow and red OLEDs, phosphorescent materials have been successfully commercialized. Blue phosphorescent devices still have the problems of blue unsaturation, short device lifetime, high operating voltage, and the like. Commercial full-color OLED displays typically employ a hybrid strategy, using either blue fluorescence and phosphorescent yellow, or red and green. At present, the rapid decrease in efficiency of phosphorescent OLEDs at high luminance is still a problem. In addition, it is desirable to have a more saturated emission spectrum, higher efficiency and longer device lifetime.

In order to meet the increasing demands of the industry on various aspects of electroluminescent devices, such as color of light emission, color saturation of light emission, driving voltage, light emitting efficiency, device lifetime, etc., researches on phosphorescent devices are still in need. In the research of phosphorescent devices, the matching use of phosphorescent light-emitting materials and host materials is very important, and the matching selection of the phosphorescent light-emitting materials and the host materials is directly related to the light-emitting performance of the devices. The selection and optimization of the combination of phosphorescent light-emitting materials and host materials is therefore an important part of the research relevant in the industry.

Disclosure of Invention

The invention aims to provide an electric field generator with a novel material combinationLight emitting devices address at least some of the above issues. The electroluminescent device uses a first compound having phenanthrooxazole and similar structures and a ligand L_aAnd a novel combination of materials consisting of the second compound of (a), which novel combination of materials can be used in the light-emitting layer of an electroluminescent device. The novel material combination can enable an electroluminescent device to obtain lower voltage and higher efficiency, and can provide better device performance.

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

an anode, a cathode, a anode and a cathode,

a cathode electrode, which is provided with a 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 first compound has a structure represented by formula 1 a:

in formula 1a, A₁-A₁₀Each independently selected from C, CR_AOr N; and A is₁-A₁₀3 of are C; wherein 2C are adjacent and are connected to the structure represented by formula 1 b; another C is linked to a structure represented by formula 1C:

respectively representing the position of the connection of the formula 1b and the formula 1a, and the position of the connection of the formula 1c and the formula 1 a;

ar is selected from substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, or a combination thereof;

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 fromNR₂O or S;

R_A，R₁，R₂each occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, halogen, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted heteroalkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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, substituted or unsubstituted arylsilyl groups having 6 to 20 carbon atoms, substituted or unsubstituted amino groups having 0 to 20 carbon atoms, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof;

adjacent substituents R_A，R₁And R₂Can optionally be linked to form a ring;

the second compound is a metal complex and comprises a ligand L coordinated with the metal_aAnd the metal is selected from metals having a relative atomic mass greater than 40; l is_aHas a structure represented by formula 2:

in formula 2, Z is selected from O, S or Se;

X₁-X₈selected, identically or differently at each occurrence, from C, CR_xOr N;

Y₁-Y₆selected from CR, identically or differently at each occurrence_y1、CR_y2Or N; said R is_y2has-L₁-SiR_s1R_s2R_s3Is connected withStructuring;

R_x，R_y1，R_s1，R_s2，R_s3each occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, halogen, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted heteroalkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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, substituted or unsubstituted arylsilane groups having 6 to 20 carbon atoms, substituted or unsubstituted amino groups having 0 to 20 carbon atoms, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof;

L₁selected 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 substituents R_x，R_s1，R_s2，R_s3Can optionally be linked to form a ring.

According to one embodiment of the present invention, a display assembly is disclosed that includes an electroluminescent device as shown in the previous embodiments.

According to another embodiment of the present invention, a combination of compounds is also disclosed, wherein at least the first compound and the second compound are included.

The invention discloses a novel electroluminescent device, which uses a compound consisting of phenanthrooxazole and the likeFirst compound of structure and comprising ligand L_aAnd a novel combination of materials consisting of the second compound of (a), which novel combination of materials can be used in the light-emitting layer of an electroluminescent device. The novel material combination enables the novel electroluminescent device to obtain lower voltage and higher efficiency, and can provide better device performance.

Drawings

Fig. 1 is a schematic diagram of an organic light emitting device that may contain electroluminescent devices as disclosed herein.

Fig. 2 is a schematic view of another organic light emitting device that may contain electroluminescent devices as disclosed herein.

Detailed Description

OLEDs can be fabricated on a variety of substrates, such as glass, plastic, and metal. Fig. 1 schematically, but without limitation, illustrates an organic light emitting device 100. The figures are not necessarily to scale, and some of the layer structures in the figures may be omitted as desired. The device 100 may include a substrate 101, an anode 110, a hole injection layer 120, a hole transport layer 130, an electron blocking layer 140, an emissive layer 150, a hole blocking layer 160, an electron transport layer 170, an electron injection layer 180, and a cathode 190. The device 100 may be fabricated by sequentially depositing the described layers. The nature and function of the layers, as well as exemplary materials, are described in more detail in U.S. patent US7,279,704B2, columns 6-10, which is incorporated herein by reference in its entirety.

There are more instances of each of these layers. For example, a flexible and transparent substrate-anode combination is disclosed in U.S. Pat. No. 5,844,363, which is incorporated by reference in its entirety. An example of a p-doped hole transport layer is doped with F at a molar ratio of 50:1₄-TCNQ m-MTDATA 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 to Thompson et al, which is incorporated by reference in its entirety. An example of an n-doped electron transport layer is BPhen doped with Li at a molar ratio of 1:1, as disclosed in U.S. patent application publication No. 2003/0230980, which is incorporated by reference in its entirety. Incorporated by reference in its entiretyUs patent nos. 5,703,436 and 5,707,745, which are incorporated by reference, disclose examples of cathodes including composite cathodes having a thin layer of a metal such as Mg: Ag with an overlying layer of transparent, conductive, sputter-deposited ITO. The principles and use of barrier layers are described in more detail in U.S. patent No. 6,097,147 and U.S. patent application publication No. 2003/0230980, which are incorporated by reference in their entirety. Examples of injection layers are provided in U.S. patent application publication No. 2004/0174116, which is incorporated by reference in its entirety. A description of the protective layer may be found in U.S. patent application publication No. 2004/0174116, which is incorporated by reference in its entirety.

The above-described hierarchical structure is provided via non-limiting embodiments. The function of the OLED may be achieved by combining the various layers described above, or some layers may be omitted entirely. It may also include other layers not explicitly described. Within each layer, a single material or a mixture of materials may be used to achieve optimal performance. Any functional layer may comprise several sub-layers. For example, the light emitting layer may have two layers of different light emitting materials to achieve a desired light emission spectrum.

In one embodiment, an OLED may be described as having an "organic layer" disposed between a cathode and an anode. The organic layer may include one or more layers.

The OLED also requires an encapsulation layer, as shown in fig. 2, which is a schematic, non-limiting illustration of an organic light emitting device 200, which differs from fig. 1 in that an encapsulation layer 102 may also be included on the cathode 190 to prevent harmful substances from the environment, such as moisture and oxygen. Any material capable of providing an encapsulation function may be used as the encapsulation layer, such as glass or a hybrid organic-inorganic layer. The encapsulation layer should be placed directly or indirectly outside the OLED device. Multilayer film encapsulation is described in U.S. patent US7,968,146B2, the entire contents of which are incorporated herein by reference.

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

The materials and structures described herein may also be used in other organic electronic devices as previously listed.

As used herein, "top" means furthest from the substrate, and "bottom" means closest to the substrate. Where a first layer is described as being "disposed on" a second layer, the first layer is disposed farther from the substrate. Other layers may be present between the first and second layers, unless it is specified that the first layer is "in contact with" the second layer. For example, a cathode can be described as being "disposed on" an anode even though various organic layers are present between the cathode and the anode.

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

A ligand may be referred to as "photoactive" when it is believed that the ligand directly contributes to the photoactive properties of the emissive material. A ligand may be referred to as "ancillary" when it is believed that the ligand does not contribute to the photoactive properties of the emissive material, but the ancillary ligand may alter the properties of the photoactive ligand.

It is believed that the Internal Quantum Efficiency (IQE) of fluorescent OLEDs can be limited by delaying fluorescence beyond 25% spin statistics. Delayed fluorescence can generally be divided into two types, i.e., P-type delayed fluorescence and E-type delayed fluorescence. P-type delayed fluorescence results from triplet-triplet annihilation (TTA).

On the other hand, E-type delayed fluorescence does not depend on collision of two triplet states, but on conversion between triplet and singlet excited states. Compounds capable of producing E-type delayed fluorescence need to have a very small mono-triplet gap in order to switch between energy states. Thermal energy can activate a transition from a triplet state back to a singlet state. This type of delayed fluorescence is also known as Thermally Activated Delayed Fluorescence (TADF). A significant feature of TADF is that the retardation component increases with increasing temperature. If the reverse intersystem crossing (RISC) rate is fast enough to minimize non-radiative decay from the triplet state, then the fraction of backfill singlet excited states may reach 75%. The total singlet fraction may be 100%, far exceeding 25% of the spin statistics of the electrogenerated excitons.

The delayed fluorescence characteristic of type E can be found in excited complex systems or in single compounds. Without being bound by theory, it is believed that E-type delayed fluorescence requires the light emitting material to have a small mono-triplet energy gap (Δ Ε)_S-T). Organic non-metal containing donor-acceptor emissive materials may be able to achieve this. The emission of these materials is generally characterized as donor-acceptor Charge Transfer (CT) type emission. Spatial separation of HOMO from LUMO in these donor-acceptor type compounds generally results in small Δ E_S-T. These states may include CT states. Generally, donor-acceptor light emitting materials are constructed by linking an electron donor moiety (e.g., an amino or carbazole derivative) to an electron acceptor moiety (e.g., a six-membered, N-containing, aromatic ring).

Definitions for substituent terms

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

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

Cycloalkyl-as used herein, comprises a cyclic alkyl group. The cycloalkyl group may be a cycloalkyl group having 3 to 20 ring carbon atoms, preferably a cycloalkyl group 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. Among the above, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4, 4-dimethylcyclohexyl are preferable. In addition, the cycloalkyl group may be optionally substituted.

Heteroalkyl-as used herein, heteroalkyl comprises a alkyl chain wherein one or more carbons are substituted with a heteroatom selected from the group consisting of nitrogen, oxygen, sulfur, selenium, phosphorus, silicon, germanium and boron atoms. The heteroalkyl group may be a heteroalkyl group having 1 to 20 carbon atoms, preferably a heteroalkyl group having 1 to 10 carbon atoms, more preferably a heteroalkyl group having 1 to 6 carbon atoms. Examples of heteroalkyl groups include methoxymethyl, ethoxymethyl, ethoxyethyl, methylthiomethyl, ethylthiomethyl, ethylthioethyl, methoxymethoxymethyl, ethoxyethoxyethoxyethyl, hydroxymethyl, hydroxyethyl, hydroxypropyl, mercaptomethyl, mercaptoethyl, mercaptopropyl, aminomethyl, aminoethyl, aminopropyl, dimethylaminomethyl, trimethylsilyl, dimethylethylsilyl, dimethylisopropylsilyl, tert-butyldimethylsilyl, triethylsilyl, triisopropylsilyl, trimethylsilylmethyl, trimethylsilylethyl, trimethylsilylisopropyl. In addition, heteroalkyl groups may be optionally substituted.

Alkenyl-as used herein, encompasses straight chain, branched chain, and cyclic olefin groups. The alkenyl group may be an alkenyl group containing 2 to 20 carbon atoms, preferably an alkenyl group having 2 to 10 carbon atoms. Examples of the alkenyl group include a vinyl group, a propenyl group, a 1-butenyl group, a 2-butenyl group, a 3-butenyl group, a1, 3-butadienyl group, a 1-methylvinyl group, a styryl group, a 2, 2-diphenylvinyl group, a 1-methylallyl group, a1, 1-dimethylallyl group, a 2-methylallyl group, a 3-phenylallyl group, a 3, 3-diphenylallyl group, a1, 2-dimethylallyl group, a 1-phenyl-1-butenyl group, a 3-phenyl-1-butenyl group, a cyclopentenyl group, a cyclopentadienyl group, a cyclohexenyl group, a cycloheptenyl group, a cycloheptatrienyl group, a cyclooctenyl group, a cyclooctatetraenyl group and a norbornenyl group. In addition, alkenyl groups may be optionally substituted.

Alkynyl-as used herein, straight chain alkynyl groups are contemplated. The alkynyl group may be an alkynyl group containing 2 to 20 carbon atoms, preferably an alkynyl group having 2 to 10 carbon atoms. Examples of alkynyl include ethynyl, propynyl, propargyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-pentynyl, 2-pentynyl, 3, 3-dimethyl-1-butynyl, 3-ethyl-3-methyl-1-pentynyl, 3, 3-diisopropyl-1-pentynyl, phenylethynyl, phenylpropynyl, and the like. Among the above, preferred are ethynyl, propynyl, propargyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-pentynyl and phenylethynyl. In addition, alkynyl groups may be optionally substituted.

Aryl or aromatic-as used herein, non-fused and fused systems are contemplated. The aryl group may be an aryl group having 6 to 30 carbon atoms, preferably an aryl group having 6 to 20 carbon atoms, more preferably an aryl group having 6 to 12 carbon atoms. Examples of aryl groups include phenyl, biphenyl, terphenyl, triphenylene, tetraphenylene, naphthalene, anthracene, phenalene, phenanthrene, fluorene, pyrene,

perylene and azulene, preferably phenyl, biphenyl, terphenyl, triphenylene, fluorene and naphthalene. Examples of non-fused aryl groups include phenyl, biphenyl-2-yl, biphenyl-3-yl, biphenyl-4-yl, p-terphenyl-4-yl, p-terphenyl-3-yl, p-terphenyl-2-yl, m-terphenyl-4-yl, m-terphenyl-3-yl, m-terphenyl-2-yl, o-tolyl, m-tolyl, p-tolyl, p- (2-phenylpropyl) phenyl, 4 '-methyldiphenyl, 4' -tert-butyl-p-terphenyl-4-yl, o-cumyl, m-cumyl, p-cumyl, 2, 3-xylyl, 3, 4-xylyl, 2, 5-xylyl, mesityl and m-quaterphenyl. In addition, the aryl group may be optionally substituted.

Heterocyclyl or heterocyclic-as used herein, non-aromatic cyclic groups are contemplated. The non-aromatic heterocyclic group includes a saturated heterocyclic group having 3 to 20 ring atoms and an unsaturated non-aromatic heterocyclic group having 3 to 20 ring atoms, at least one of which 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, and preferred non-aromatic heterocyclic groups are those having 3 to 7 ring atoms, which include at least one hetero atom such as nitrogen, oxygen, silicon or sulfur. Examples of non-aromatic heterocyclic groups include oxiranyl, oxetanyl, tetrahydrofuryl, tetrahydropyranyl, dioxolanyl, dioxanyl, aziridinyl, dihydropyrrolyl, tetrahydropyrrolyl, piperidinyl, oxazolidinyl, morpholinyl, piperazinyl, oxepinyl, thiepinyl, azepinyl, and tetrahydrosilolyl. In addition, the heterocyclic group may be optionally substituted.

Heteroaryl-as used herein, non-fused and fused heteroaromatic groups that may contain 1 to 5 heteroatoms, at least one of which 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 heteroaryl. The heteroaryl group may be a heteroaryl group having 3 to 30 carbon atoms, preferably a heteroaryl group having 3 to 20 carbon atoms, and more preferably a heteroaryl group having 3 to 12 carbon atoms. Suitable heteroaryl groups include dibenzothiophene, dibenzofuran, dibenzoselenophene, furan, thiophene, benzofuran, benzothiophene, benzoselenophene, carbazole, indolocarbazole, pyridine indole, pyrrolopyridine, pyrazole, imidazole, triazole, oxazole, thiazole, oxadiazole, bisoxazole, thiadiazole, pyridine, pyridazine, pyrimidine, pyrazine, triazine, oxazine, oxathiazine, oxadiazine, indoline, benzimidazole, indazole, indenozine, benzoxazole, benzisoxazole, benzothiazole, quinoline, isoquinoline, quinoline, quinazoline, quinoxaline, naphthyridine, phthalazine, pteridine, xanthene, acridine, phenazine, phenothiazine, benzofuropyridine, furobipyridine, benzothienopyridine, thienobipyridine, benzothiophene bipyridine, benzothiophene, selenophene bipyridine, selenophene bipyridine, preferably dibenzothiophene, dibenzofuran, dibenzoselenophene, carbazole, indolocarbazole, imidazole, pyridine, triazine, benzimidazole, 1, 2-azaborine, 1, 3-azaborine, 1, 4-azaborine, borazole, and aza analogues thereof. In addition, the heteroaryl group may be optionally substituted.

Alkoxy-as used herein, is represented by-O-alkyl, -O-cycloalkyl, -O-heteroalkyl, or-O-heterocyclyl. Examples and preferred examples of the alkyl group, cycloalkyl group, heteroalkyl group and heterocyclic group are the same as those described above. The alkoxy group may be an alkoxy group having 1 to 20 carbon atoms, preferably an alkoxy group having 1 to 6 carbon atoms. Examples of the alkoxy group include methoxy, ethoxy, propoxy, butoxy, pentyloxy, hexyloxy, cyclopropyloxy, cyclobutyloxy, cyclopentyloxy, cyclohexyloxy, tetrahydrofuryloxy, tetrahydropyranyloxy, methoxypropyloxy, ethoxyethyloxy, methoxymethyloxy and ethoxymethyloxy. In addition, alkoxy groups may be optionally substituted.

Aryloxy-as used herein, is represented by-O-aryl or-O-heteroaryl. Examples and preferred examples of the aryl and heteroaryl groups are the same as those described above. The aryloxy group may be an aryloxy group having 6 to 30 carbon atoms, preferably an aryloxy group having 6 to 20 carbon atoms. Examples of the aryloxy group include a phenoxy group and a biphenyloxy group. In addition, the aryloxy group may be optionally substituted.

Aralkyl-as used herein, encompasses aryl-substituted alkyl groups. The aralkyl group may be an aralkyl group having 7 to 30 carbon atoms, preferably an aralkyl group having 7 to 20 carbon atoms, more preferably an aralkyl group having 7 to 13 carbon atoms. Examples of the aralkyl group include benzyl, 1-phenylethyl, 2-phenylethyl, 1-phenylisopropyl, 2-phenylisopropyl, phenyl tert-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. Among the above, benzyl, p-cyanobenzyl, m-cyanobenzyl, o-cyanobenzyl, 1-phenylethyl, 2-phenylethyl, 1-phenylisopropyl and 2-phenylisopropyl are preferable. In addition, the aralkyl group may be optionally substituted.

Alkylsilyl-as used herein, alkyl substituted silyl is contemplated. The alkylsilyl group may be an alkylsilyl group having 3 to 20 carbon atoms, preferably an alkylsilyl group having 3 to 10 carbon atoms. Examples of the alkylsilyl group include trimethylsilyl group, triethylsilyl group, methyldiethylsilyl group, ethyldimethylsilyl group, tripropylsilyl group, tributylsilyl group, triisopropylsilyl group, methyldiisopropylsilyl group, dimethylisopropylsilyl group, tri-tert-butylsilyl group, triisobutylsilyl group, dimethyl-tert-butylsilyl group, and methyl-di-tert-butylsilyl group. Additionally, the alkylsilyl group may be optionally substituted.

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

The term "aza" in azabenzofuran, azabenzothiophene, etc., means that one or more of the C-H groups in the corresponding aromatic moiety are replaced by a nitrogen atom. For example, azatriphenylenes include dibenzo [ f, h ] quinoxalines, dibenzo [ f, h ] quinolines, and other analogs having two or more nitrogens in the ring system. Other nitrogen analogs of the above-described aza derivatives may be readily envisioned by one of ordinary skill in the art, and all such analogs are intended to be encompassed within the terms described herein.

In this disclosure, unless otherwise defined, when any one of the terms in 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, substituted phosphino, meaning alkyl, cycloalkyl, heteroalkyl, heterocyclyl, aralkyl, alkoxy, aryloxy, alkenyl, alkynyl, aryl, heteroaryl, alkylsilyl, arylsilyl, amino, acyl, carbonyl, carboxylic acid, ester, sulfinyl, sulfonyl and phosphino, any of which groups may be substituted by one or more groups selected from deuterium, halogen, unsubstituted alkyl having 1 to 20 carbon atoms, unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, unsubstituted heteroalkyl having 1 to 20 carbon atoms, unsubstituted heterocyclyl having 3 to 20 ring atoms, unsubstituted aralkyl having 7 to 30 carbon atoms, unsubstituted alkoxy having 1 to 20 carbon atoms, unsubstituted aryloxy having 6 to 30 carbon atoms, unsubstituted alkenyl having 2 to 20 carbon atoms, unsubstituted alkynyl having 2 to 20 carbon atoms, unsubstituted aryl having 6 to 30 carbon atoms, unsubstituted heteroaryl having 3 to 30 carbon atoms, unsubstituted alkylsilyl having 3 to 20 carbon atoms, unsubstituted arylsilyl having 6 to 20 carbon atoms, unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof.

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

In the compounds mentioned in the present disclosure, a hydrogen atom may be partially or completely replaced by deuterium. Other atoms such as carbon and nitrogen may also be replaced by their other stable isotopes. Substitution of other stable isotopes in the compounds may be preferred because it enhances the efficiency and stability of the device.

In the compounds mentioned in the present disclosure, polysubstitution is meant to encompass disubstituted substitutions up to the maximum range of available substitutions. When a substituent in a compound mentioned in the present disclosure represents multiple substitution (including di-substitution, tri-substitution, tetra-substitution, etc.), that is, it means that the substituent may exist at a plurality of available substitution positions on its connecting structure, and the substituent existing at each of the plurality of available substitution positions may be the same structure or different structures.

In the compounds mentioned in the present disclosure, adjacent substituents in the compounds cannot be linked to form a ring unless specifically defined, for example, adjacent substituents can be optionally linked to form a ring. In the compounds mentioned in the present disclosure, adjacent substituents can be optionally linked to form a ring, including both the case where adjacent substituents may be linked to form a ring and the case where adjacent substituents are not linked to form a ring. When adjacent substituents can optionally be joined to form a ring, the ring formed can be monocyclic or polycyclic, as well as alicyclic, heteroalicyclic, aromatic or heteroaromatic rings. In this expression, adjacent substituents may refer to substituents bonded to the same atom, substituents bonded to carbon atoms directly bonded to each other, or substituents bonded to carbon atoms further away. Preferably, adjacent substituents refer to substituents bonded to the same carbon atom as well as substituents bonded to carbon atoms directly bonded to each other.

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

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

further, the expression that adjacent substituents can be optionally connected to form a ring is also intended to be taken to mean that, in the case where one of two substituents bonded to carbon atoms directly bonded to each other represents hydrogen, the second substituent is bonded at a position to which the hydrogen atom is bonded, thereby forming a ring. This is exemplified by the following equation:

an anode, a cathode, a anode and a cathode,

a cathode electrode, which is provided with a cathode,

the first compound has a structure represented by formula 1 a:

in formula 1a, A₁-A₁₀Each independently selected from C, CR_AOr N; and A is₁-A₁₀3 of are C; wherein 2C are adjacent and are connected to the structure represented by formula 1 b; and the other C is linked to a structure represented by formula 1C:

represents the position where formula 1b is connected to formula 1a, and the position where formula 1c is connected to formula 1a, respectively;

v is selected from NR₂O or S;

R_A，R₁，R₂each occurrence, the same or different, is 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 groups having 6 to 20 carbon atoms, substituted or unsubstituted amino groups having 0 to 20 carbon atoms, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof;

adjacent substituents R_A，R₁，R₂Can optionally be linked to form a ring;

in formula 2, Z is selected from O, S or Se;

X₁-X₈is selected, identically or differently on each occurrence, from C, CR_xOr N;

Y₁-Y₆is selected, identically or differently on each occurrence, from CR_y1、CR_y2Or N; the R is_y2Having a radical of formula-L₁-SiR_s1R_s2R_s3The structure of (1);

R_x，R_y1，R_s1，R_s2，R_s3each occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, halogen, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted heteroalkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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, substituted or unsubstituted arylsilyl groups having 6 to 20 carbon atoms, substituted or unsubstituted amino groups having 0 to 20 carbon atoms, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof;

In this context, adjacent substituents R_A，R₁And R₂Can optionally be linked to form a ring, is intended to mean a group in which adjacent substituents are present, for example two substituents R_AOf a substituent R_AAnd R₂And a substituent R₁And R₂Any one or more of these substituent groups may be linked to form a ring. Obviously, none of these substituents may be connected to each other to form a ring.

In the examples, adjacent substituents R_x，R_s1，R_s2，R_s3Can optionally be linked to form a ring, is intended to mean for adjacent substituent groups, for example, adjacent substituents R_xOf a substituent R_s1And R_s2Of a substituent R_s1And R_s3And a substituent R_s2And R_s3Any one or more of these adjacent substituent groups can be linked to form a ring. Obviously, these substituent groups may not be connected to form a ring.

According to one embodiment of the present invention, in formula 1a, A₁-A₁₀Each independently selected from C, CR_AOr N, and A₁-A₁₀At least one of which is selected from N.

According to an embodiment of the present invention, wherein the first compound has a structure represented by one of formulas 1a-1 to 1 a-6:

in formulae 1a-1 to 1a-6,

A₁-A₁₀selected, identically or differently at each occurrence, from C, CR_AOr N; and A is₁-A₁₀Is C, and is linked to a structure represented by formula 1C:

represents the position where formula 1c is linked to formulae 1a-1 to 1 a-6;

v is selected from NR₂O or S;

adjacent substituents R_A，R₁And R₂Can optionally be linked to form a ring.

In this example, in formulae 1a-1 to 1a-6, A₁-A₁₀Selected, identically or differently at each occurrence, from C, CR_AOr N; and A is₁-A₁₀Is C, and is linked to a structure represented by formula 1C, intended to represent:

in the formulae 1a-1 and 1a-4, A₃-A₁₀Selected, identically or differently at each occurrence, from C, CR_AOr N; and A is₃-A₁₀Is C and is linked to a structure represented by formula 1C;

in the formulae 1a-2 and 1a-5, A₁And A₄-A₁₀Selected, identically or differently at each occurrence, from C, CR_AOr N; and A is₁And A₄-A₁₀Is C and is linked to a structure represented by formula 1C;

in formulae 1a-3 and 1a-6, A₁-A₂And A₅-A₁₀Selected, identically or differently at each occurrence, from C, CR_AOr N; and A is₁-A₂And A₅-A₁₀Is C, and is linked to a structure represented by formula 1C.

According to one embodiment of the invention, V in the formulas 1a-1 to 1a-6 is selected from O or S.

According to one embodiment of the present invention, V in the formulas 1a-1 to 1a-6 is O.

According to one embodiment of the invention, wherein R is_A，R₁And R₂Each occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted alkenyl groups having 2 to 20 carbon atoms, substituted or unsubstituted aryl groups having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3 to 30 carbon atoms, and combinations thereof.

According to one embodiment of the invention, wherein R is_A，R₁And R₂Each occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, fluorine, cyano, hydroxyl, mercapto, methyl, trideuteromethyl, vinyl, phenyl, biphenyl, naphthyl, 4-cyanophenyl, dibenzofuranyl, dibenzothiophenyl, triphenylene, carbazolyl, 9-phenylcarbazolyl, 9, 9-dimethylfluorenyl, pyridyl, phenylpyridinyl, and combinations thereof.

According to an embodiment of the present invention, wherein Ar in formula 1c has a structure represented by one of formulae 1c-1 to 1 c-3:

wherein the content of the first and second substances,

in the formula 1c-1, B₁-B₆Selected from C, CR, the same or different at each occurrence_BOr N;

in the formula 1c-2, B₁-B₈Selected from C, CR, the same or different at each occurrence_BOr N;

in formula 1c-3, B₁-B₈Selected from C, CR, the same or different at each occurrence_BOr N; g is selected from CR_gR_g，SiR_gR_g，NR_g，BR_g，PR_gO, S or Se; when two R are simultaneously present_gWhen two R are present_gMay be the same or different;

R_B，R_geach occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, halogen, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted heteroalkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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, substituted or unsubstituted arylsilane groups having 6 to 20 carbon atoms, and combinations thereof;

"means" indicates the position at which the Ar structure is attached to the L in formula 1 c;

adjacent substituents R_BAnd R_gCan optionally be linked to form a ring.

In this context, adjacent substituents R_BAnd R_gCan optionally be linked to form a ring, is intended to mean a group in which adjacent substituents are present, for example two substituents R_BIn between, two substituents R_gAnd a substituent R_BAnd R_gAnd any one or more of these substituent groups may be linked to form a ring. Obviously, none of these substituents may be connected to each other to form a ring.

According to an embodiment of the present invention, wherein Ar in formula 1c has a structure represented by one of formulae 1c-11 to 1 c-20:

in formulae 1c-11 to 1c-20, B₁-B_nSelected from CR, identically or differently at each occurrence_BOr N; b is described_nCorresponding to the B₁-B₁₂The largest of the numbers present in any of formulae 1c-11 to 1c-20, G is selected from CR, the same or different at each occurrence_gR_g，SiR_gR_g，NR_g，BR_g，PR_gO, S or Se; when two R are simultaneously present_gWhen two R are present_gMay be the same or different;

R_B，R_geach occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkyl having 3 to 20 carbon atoms, substituted or unsubstituted aryl having 3 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted aryl having 3 to 20 carbon atoms, or substituted or unsubstituted aryl having 2 to 20 carbon atomsAlkylsilyl of carbon atoms, substituted or unsubstituted arylsilyl groups having 6 to 20 carbon atoms, and combinations thereof;

adjacent substituents R_BAnd R_gCan optionally be linked to form a ring.

Herein, in the formulae 1c-11 to 1c-20, B₁-B_nSelected from CR, identically or differently at each occurrence_BOr N; b is_nCorresponding to said B₁-B₁₂The largest of the numbers present in any of formulae 1c-11 to 1c-20, G is selected from CR, the same or different at each occurrence_gR_g，SiR_gR_g，NR_g，BR_g，PR_gO, S or Se; when two R are simultaneously present_gWhen two R are present_gWhich may be the same or different, are intended to mean:

in the formula 1c-11, B₁-B₅Selected from CR, identically or differently at each occurrence_BOr N;

in formula 1c-12, B₁And B₃-B₈Selected from CR, identically or differently at each occurrence_BOr N;

in the formula 1c-13, B₂-B₈Is selected, identically or differently on each occurrence, from CR_BOr N;

in formulae 1c-14 and 1c-15, B₁And B₃-B₁₂Selected from CR, identically or differently at each occurrence_BOr N;

in the formula 1c-16, B₁-B₄，B₇-B₁₂Selected from CR, identically or differently at each occurrence_BOr N;

in the formula 1c-17, B₂-B₈Is selected, identically or differently on each occurrence, from CR_BOr N; g is selected from CR, the same or different at each occurrence_gR_g，SiR_gR_g，NR_g，BR_g，PR_gO, S or Se; when two R are simultaneously present_gWhen two R are present_gMay be the same or different;

in the formula 1c-18, B₁，B₃-B₈Selected from CR, identically or differently at each occurrence_BOr N; g is selected from CR, the same or different at each occurrence_gR_g，SiR_gR_g，NR_g，BR_g，PR_gO, S or Se; when two R are simultaneously present_gWhen two R are present_gMay be the same or different;

in the formulae 1c-19, B₁-B₂，B₄-B₈Selected from CR, identically or differently at each occurrence_BOr N; g is selected from CR, the same or different at each occurrence_gR_g，SiR_gR_g，NR_g，BR_g，PR_gO, S or Se; when two R are simultaneously present_gWhen two R are present_gMay be the same or different;

in the formula 1c-20, B₁-B₃And B₅-B₈Is selected, identically or differently on each occurrence, from CR_BOr N; g is selected from CR, the same or different at each occurrence_gR_g，SiR_gR_g，NR_g，BR_g，PR_gO, S or Se; when two R are simultaneously present_gWhen two R are present_gMay be the same or different.

According to one embodiment of the present invention, in the formula 1c-11, B₁、B₃、B₅At least one of which is N and the others are each independently selected from CR_BOr N; b in formulae 1c-12 to 1c-20₁-B_nAt least one of them is N, said B_nCorresponding to the B₁-B₁₂The largest number among the groups represented by any one of the formulae 1c-11 to 1c-20, and the others are independently selected from CR_BOr N.

In formula 1c-11, B according to one embodiment of the present invention₁、B₃、B₅Two or three of them are N, the others are each independently selected from CR_BOr N; b in formulae 1c-12 to 1c-20₁-B_nAt least two of which are N, said B_nCorresponding to the B₁-B₁₂Present in any one of formula 1c-11 to formula 1c-20The others are independently selected from CR_BOr N.

According to one embodiment of the invention, wherein R is_BEach occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted alkenyl groups having 2 to 20 carbon atoms, substituted or unsubstituted aryl groups having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3 to 30 carbon atoms, and combinations thereof.

According to one embodiment of the invention, wherein R is_BEach occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, methyl, trideuteromethyl, vinyl, phenyl, biphenyl, naphthyl, 4-cyanophenyl, dibenzofuranyl, dibenzothiophenyl, triphenylene, carbazolyl, 9-phenylcarbazolyl, 9, 9-dimethylfluorenyl, pyridinyl, phenylpyridinyl, and combinations thereof.

According to one embodiment of the present invention, wherein B in the formulas 1c-11 to 1c-20₁-B_nAt least one is CR_BSaid B is_nCorresponding to the B₁-B₁₂The largest number among the groups represented by any one of the formulae 1c-11 to 1c-20, and R_BSelected from the group consisting of: deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted alkenyl groups having 2 to 20 carbon atoms, substituted or unsubstituted aryl groups having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3 to 30 carbon atoms, and combinations thereof.

According to an embodiment of the present invention, wherein B in the formulas 1c-11 to 1c-20₁-B_nAt least one is CR_BSaid B is_nCorresponding to the B₁-B₁₂The largest number among the groups represented by any one of the formulae 1c-11 to 1c-20, and R_BSelected from the group consisting of: deuterium, methyl, trideuteromethyl, vinyl, phenyl, biphenyl, naphthyl, 4-cyanophenyl, dibenzofuranyl, dibenzothienyl, triphenylene,carbazolyl, 9-phenylcarbazolyl, 9, 9-dimethylfluorenyl, pyridinyl, phenylpyridinyl, and combinations thereof.

According to an embodiment of the present invention, 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 shown in claim 9.

According to one embodiment of the present invention, wherein, optionally, the hydrogen energy in the structure of Ar-1 to Ar-78 is partially or completely substituted with deuterium.

According to one embodiment of the invention, wherein 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.

According to one embodiment of the invention, wherein L is selected from the group consisting of: a single bond, phenylene, naphthylene, biphenylene, terphenylene, triphenylene, pyridylene, thienylene, dibenzofuranylene, dibenzothiophenylene, and combinations thereof.

According to one embodiment of the invention, the first compound is selected from the group consisting of E-1 to E-91, wherein the specific structure of E-1 to E-91 is shown in claim 11.

According to one embodiment of the invention, wherein the hydrogen energy in the structure of the compounds E-1 to E-91 is partially or completely substituted by deuterium.

According to an embodiment of the present invention, wherein in said formula 2, Y₁-Y₆Is selected, identically or differently on each occurrence, from CR_y1、CR_y2Or N, Y₁-Y₆At least one of them is selected from CR_y2And said R is_y2has-L₁-SiR_s1R_s2R_s3The structure of (1);

R_s1，R_s2，R_s3each occurrence, the same or different, is 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 cycloalkyl having 1 to 20 carbon atomsSubstituted 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, carboxylic acid group, ester group, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

adjacent substituents R_s1，R_s2，R_s3Can optionally be linked to form a ring.

In this context, adjacent substituents R_s1，R_s2，R_s3Can optionally be linked to form a ring, is intended to mean for the adjacent substituent group, for example, substituent R_s1And R_s2Of a substituent R_s1And R_s3And a substituent R_s2And R_s3And any one or more of these adjacent substituent groups can be linked to form a ring. Obviously, none of these substituent groups may be linked to form a ring. Any adjacent substituent R_y1Are not connected to form a ring.

According to an embodiment of the present invention, wherein, in formula 2, X₁-X₄Two of which are adjacent to each other are C, and one of the C is bonded to the metal through a carbon-metal bond, X₁-X₄The one in ortho position to the carbon-metal bond is selected from CR_xAnd R is_XSelected from deuterium, halogen, substituted or unsubstituted with 1-20 carbonsAn alkyl group of 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, a substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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, substituted or unsubstituted amino, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof having from 0 to 20 carbon atoms.

In this embodiment, X₁-X₄Two of which are adjacent to each other are C, and one of said C is bonded to said metal through a carbon-metal bond, when X is₁-X₄The one in the ortho position to the carbon-metal bond is selected from CR_xAnd said R is_xSelected from the group of substituents. For example, when said X is₁Is C, X₂Is also C and forms a carbon-metal bond with the metal, then L is_aHas the advantages of

In this case, X₁-X₄The one in the ortho position to the carbon-metal bond in question is X₃，X₃Selected from the group consisting of CR_xAnd said R is_xSelected from the group of substituents. Then, for example, X in said formula 1₂Is C, X₁Is also C and forms a carbon-metal bond with the metal, then said L_aHas the advantages of

Structure of (1), then X₁-X₄The ortho position in which the carbon-metal bond is not present may be substituted, which is clearly not the case in the present example.

According to an embodiment of the present invention, wherein, in formula 2, X₁-X₈And Y₁-Y₆At least one of them is selected from CR_xOr CR_y1(ii) a And said R is_x，R_y1Each occurrence, the same or different, is selected from the group consisting of: deuterium, halogen, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted heteroalkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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, substituted or unsubstituted amino, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof having from 0 to 20 carbon atoms.

In this embodiment, X₁-X₈And Y₁-Y₆At least one of them is selected from CR_xOr CR_y1Is referred to as X₁-X₈At least one of them is selected from CR_xOr Y₁-Y₆At least one of them is selected from CR_y1And said R is_x，R_y1Each occurrence, identically or differently, is selected from the group of substituents described as being other than hydrogen.

According to an embodiment of the present invention, wherein, in formula 2, X₁-X₈And Y₁-Y₆At least two or three of them are selected from CR_xAnd/or CR_y1(ii) a And said R is_x，R_y1Each occurrence, the same or different, is selected from the group consisting of: deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted alkyl havingA cycloalkyl group of 3 to 20 ring carbon atoms, a substituted or unsubstituted heteroalkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof.

In this embodiment, X₁-X₈And Y₁-Y₆At least two or three of them are selected from CR_xAnd/or CR_y1Is referred to as X₁-X₈And Y₁-Y₆At least comprises any one or more of the following: (1) x₁-X₈At least two of which are selected from CR_x；(2)Y₁-Y₆At least two of which are selected from CR_y1；(3)X₁-X₈At least two of which are selected from CR_xAnd Y is₁-Y₆At least one of them is selected from CR_y1；(4)X₁-X₈At least one of them is selected from CR_xAnd Y is₁-Y₆At least two of which are selected from CR_y1；(5)X₁-X₈At least three of them are selected from CR_x；(6)Y₁-Y₆At least three of them are selected from CR_y1；(7)X₁-X₈At least one of them is selected from CR_xAnd Y is₁-Y₆At least one of them is selected from CR_y1. And in any of the above cases, said R_x，R_y1Each occurrence is selected, identically or differently, from the group of substituents which are not hydrogen.

According to an embodiment of the invention, wherein, theIn the second compound, the L_aHas a structure represented by formula 4:

wherein the content of the first and second substances,

z is selected from O or S;

X₃-X₈selected from CR, identically or differently at each occurrence_xOr N;

Y₁-Y₆selected from CR, identically or differently at each occurrence_y1、CR_y2Or N; wherein Y is₁-Y₆At least one of them is selected from CR_y2And said R is_y2has-L₁-SiR_s1R_s2R_s3The structure of (1);

L₁selected from the group consisting of single bonds, substituted or unsubstituted alkylene groups having 1 to 20 carbon atoms, substituted or unsubstituted alkylene groups having 3 to 20 carbon atomsCycloalkylene, substituted or unsubstituted arylene having 6 to 20 carbon atoms, substituted or unsubstituted heteroarylene having 3 to 20 carbon atoms, and combinations thereof;

According to an embodiment of the invention, wherein the second compound has M (L)_a)_m(L_b)_n(L_c)_qThe structure of (1);

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

L_a、L_band L_cA first ligand, a second ligand and a third ligand, respectively, 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, a plurality of L_aMay be the same or different; when n is 2, two L_bWhich may be the same or different, when q is 2, two L_cMay be the same or different;

L_a、L_band L_cOptionally linked to form a multidentate ligand;

L_band L_cEach occurrence, the same or different, is selected from the group consisting of:

wherein R is_a、R_bAnd R_cThe same or different at each occurrence denotes mono-, poly-or unsubstituted;

X_beach occurrence, the same or different, is selected from the group consisting of: o, S, Se, NR_N1And CR_C1R_C2；

X_cAnd X_dEach occurrence, the same or different, is selected from the group consisting of: o, S, Se and NR_N2；

R_a、R_b、R_c、R_N1、R_N2、R_C1And R_C2Each occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, halogen, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted heteroalkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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, substituted or unsubstituted arylsilyl groups having 6 to 20 carbon atoms, substituted or unsubstituted amino groups having 0 to 20 carbon atoms, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof;

adjacent substituents R_a、R_b、R_c、R_N1、R_N2、R_C1And R_C2Can optionally be linked to form a ring.

In this example, the adjacent substituents R_a、R_b、R_c、R_N1、R_N2、R_C1And R_C2Can optionally be linked to form a ring, is intended to mean a group in which adjacent substituents are present, for example two substituents R_aIn between, two substituents R_bIn between, two substituents R_cOf a substituent R_aAnd R_bOf R is a substituent_aAnd R_cOf a substituent R_bAnd R_cOf R is a substituent_aAnd R_N1Of a substituent R_bAnd R_N1Of a substituent R_aAnd R_C1Of a substituent R_aAnd R_C2Of R is a substituent_bAnd R_C1Of a substituent R_bAnd R_C2Of a substituent R_aAnd R_N2Of a substituent R_bAnd R_N2And R is_C1And R_C2And any one or more of these substituent groups may be linked to form a ring. Obviously, none of these substituents may be connected to each other to form a ring.

In this embodiment, L_a、L_bAnd L_cCan optionally be linked to form a multidentate ligand, intended to denote L_a、L_bAnd L_cOptionally linked to form a tetradentate or hexadentate ligand. Obviously, L_a、L_bAnd L_cOr may be both unconnected to form a multidentate ligand.

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

L_a、L_band L_cA first ligand, a second ligand and a third ligand, respectively, 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, a plurality of L_aMay be the same or different; when n is 2, two L_bWhich may be the same or different, when q is 2, two L_cMay be the same or different; l is_a、L_bAnd L_cOptionally linked to form a multidentate ligand;

wherein L is_bEach occurrence, identically or differently, is selected from the following structures:

R_a1、R_b1、R_c1、R_N2Each occurrence, the same or different, is selected from the group consisting of:hydrogen, deuterium, halogen, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted heteroalkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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, substituted or unsubstituted arylsilyl groups having 6 to 20 carbon atoms, substituted or unsubstituted amino groups having 0 to 20 carbon atoms, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof;

adjacent substituents R_a1、R_b1、R_c1Can optionally be linked to form a ring;

L_ceach occurrence, the same or different, is selected from the group consisting of:

R_a、R_b、R_cthe same or different at each occurrence denotes mono-, poly-or unsubstituted;

X_eeach occurrence, the same or different, is selected from the group consisting of: o, S, Se and NR_N3；

R_a、R_b、R_c、R_N3Each occurrence, the same or different, is 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 heterocycle having 3 to 20 ring atomsA group, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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 substituents R_a、R_b、R_cCan optionally be linked to form a ring.

In this example, the adjacent substituents R_a1、R_b1、R_c1Can optionally be linked to form a ring, intended to represent a substituent R_a1And R_c1Or a substituent R_b1And R_c1Can be connected to form a ring. It is obvious that the substituent R_a1And R_c1Or a substituent R_b1And R_c1May not be connected to form a ring.

In this example, the adjacent substituents R_a、R_b、R_cCan optionally be linked to form a ring, intended to denote when a plurality of substituents R are present_aA plurality of substituents R_bA plurality of substituents R_cWhen adjacent substituent R_aAdjacent and adjacent substituents R_bMeta or adjacent substituents R_cCan be connected to form a ring. It will be apparent that when a plurality of substituents R are present_bA plurality of substituents R_cWhen adjacent substituent R_aAdjacent and adjacent substituents R_bWith adjacent or adjacent substituents R_cMay not be connected to form a ring.

According to an embodiment of the present invention, wherein the second compound has a structure represented by formula 5:

wherein the content of the first and second substances,

m is 1 or 2;

z is selected, identically or differently on each occurrence, from O or S; preferably, Z is O;

X₃-X₈selected from CR, identically or differently at each occurrence_xOr N;

Y₁-Y₆selected from CR, identically or differently at each occurrence_y1、CR_y2Or N; wherein Y is₁-Y₆At least one of them is selected from CR_y2And said R is_y2Having a radical of formula-L₁-SiR_s1R_s2R_s3The structure of (1);

R_x，R_y1，R_s1，R_s2，R_s3，R₁₁，R₁₂，R₁₃，R₁₄，R₁₅，R₁₆，R₁₇each occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, halogen, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted heteroalkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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, substituted or unsubstituted arylsilyl groups having 6 to 20 carbon atoms, substituted or unsubstituted amino groups having 0 to 20 carbon atoms, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof;

L₁selected from the group consisting of single bonds,substituted or unsubstituted alkylene groups having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkylene groups having 3 to 20 carbon atoms, substituted or unsubstituted arylene groups having 6 to 20 carbon atoms, substituted or unsubstituted heteroarylene groups having 3 to 20 carbon atoms, and combinations thereof;

adjacent substituents R_x，R_s1，R_s2，R_s3Can optionally be linked to form a ring;

adjacent substituents R₁₁，R₁₂，R₁₃，R₁₄，R₁₅，R₁₆，R₁₇Can optionally be linked to form a ring.

In this example, the adjacent substituents R_x，R_s1，R_s2，R_s3Can optionally be linked to form a ring, intended to denote an adjacent substituent group therein, e.g. two substituents R_xOf a substituent R_s1And R_s2Of a substituent R_s1And R_s3And a substituent R_s2And R_s3Any one or more of these substituent groups can be linked to form a ring. Obviously, these substituent groups may not be connected to form a ring.

In this context, adjacent substituents R₁₁，R₁₂，R₁₃，R₁₄，R₁₅，R₁₆，R₁₇Can optionally be linked to form a ring, is intended to mean an adjacent substituent group therein, e.g. substituent R₁₁And R₁₂Of a substituent R₁₁And R₁₃Of a substituent R₁₂And R₁₃Of a substituent R₁₄And R₁₅Of a substituent R₁₅And R₁₆Of a substituent R₁₄And R₁₆Of a substituent R₁₁And R₁₇Of a substituent R₁₂And R₁₇Of a substituent R₁₃And R₁₇Of a substituent R₁₄And R₁₇Of a substituent R₁₅And R₁₇And a substituent R₁₆And R₁₇Of one or more of these substituent groupsAre linked to form a ring. Obviously, none of these substituent groups may be linked to form a ring.

According to one embodiment of the invention, wherein R₁₁-R₁₃At least one or two of which 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 R₁₄-R₁₆At least one of which 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 combinations thereof;

According to one embodiment of the invention, wherein R₁₁-R₁₃At least two of which 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; and/or R₁₄-R₁₆At least two of which 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;

According to one embodiment of the present invention, wherein Y₁-Y₆Each independently selected from CR_y1Or CR_y2。

According to one embodiment of the present invention, wherein Y₁-Y₆At least one of which is selected from N.

According to one embodiment of the invention, wherein Z is O.

According to one embodiment of the present invention, wherein X₃-X₈At least one of which is selected from N.

According to one embodiment of the present invention, wherein X₃-X₈One of them is selected from N

According to one embodiment of the present invention, wherein X₈Is N.

According to one embodiment of the present invention, wherein X₃-X₈Each independently selected from CR_x。

According to one embodiment of the present invention, wherein X₃-X₈Each independently selected from CR_xSaid R is_xSelected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3 to 20 ring carbon atoms, substituted or unsubstituted alkylsilyl groups having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6 to 20 carbon atoms, cyano, or combinations thereof.

According to one embodiment of the present invention, wherein X₃-X₈Each independently selected from CR_xSaid R is_xSelected from the group consisting of: hydrogen, deuterium, fluoro, methyl, ethyl, isopropyl, isobutyl, tert-butyl, neopentyl, cyclopentyl, cyclopentylmethyl, cyclohexyl, norbornyl, adamantyl, trimethylsilyl, isopropyldimethylsilyl, phenyldimethylsilyl, trifluoromethyl, cyano, and combinations thereof.

According to an embodiment of the invention, wherein X₃Selected from the group consisting of CR_xAnd said R is_xSelected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3 to 20 ring carbon atoms, substituted or unsubstituted alkylsilyl groups having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6 to 20 carbon atoms, cyano, or combinations thereof.

According to an embodiment of the invention, wherein X₃Selected from the group consisting of CR_xAnd said R is_xSelected from deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted alkyl having 3 to 2Cycloalkyl of 0 ring carbon atoms, cyano, or a combination thereof.

According to an embodiment of the invention, wherein X₃Selected from the group consisting of CR_xAnd said R is_xSelected from methyl or deuterated methyl.

According to an embodiment of the invention, wherein Y₁-Y₂Selected from CR, identically or differently at each occurrence_y1Or N; y is₃-Y₆Selected from CR, identically or differently at each occurrence_y1、CR_y2Or N, and Y₃-Y₆At least one of which is selected from CR_y2Said R is_y2has-L₁-SiR_s1R_s2R_s3The structure of (1);

R_y1each occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted aralkyl groups having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy groups having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy groups having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl groups having 2 to 20 carbon atoms, substituted or unsubstituted aryl groups having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3 to 30 carbon atoms, substituted or unsubstituted amino groups having 0 to 20 carbon atoms, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

R_s1，R_s2，R_s3each occurrence, the same or different, is 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 aralkyl having 3 to 20 carbon atomsAlkenyl 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 group, ester group, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

In this context, adjacent substituents R_s1，R_s2，R_s3Can optionally be linked to form a ring, is intended to mean for the adjacent substituent group, for example, substituent R_s1And R_s2Of a substituent R_s1And R_s3And a substituent R_s2And R_s3Any one or more of these adjacent substituent groups can be linked to form a ring. Obviously, these substituent groups may not be connected to form a ring. Any adjacent substituent R_y1Are not connected to form a ring.

According to an embodiment of the invention, wherein Y₁-Y₂Is selected, identically or differently on each occurrence, from CR_y1Or N; r_y1Each occurrence, the same or different, is 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 alkoxy having 6 to 30 carbon atomsAn aryloxy group of 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 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; and when said R is_y1Selected from the group consisting of substituted 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, substituted phosphino, meaning alkyl, cycloalkyl, heteroalkyl, aralkyl, alkoxy, aryloxy, alkenyl, aryl, heteroaryl, amino, acyl, carbonyl, carboxylic acid, ester, sulfinyl, sulfonyl and phosphino, any of which may be substituted with one or more groups selected from deuterium, halogen, unsubstituted alkyl having 1 to 20 carbon atoms, unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, unsubstituted heteroalkyl having 1 to 20 carbon atoms, unsubstituted aralkyl having 7 to 30 carbon atoms, unsubstituted alkoxy having 1 to 20 carbon atoms, unsubstituted aryloxy having 6 to 30 carbon atoms, unsubstituted alkenyl having 2 to 20 carbon atoms, unsubstituted alkynyl having 2 to 20 carbon atoms, unsubstituted aryl having 6 to 30 carbon atoms, unsubstituted heteroaryl having 3 to 30 carbon atoms, unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof.

According to one embodiment of the invention, wherein R_s1，R_s2，R_s3Each occurrence, the same or different, is 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 cycloalkyl having 1 to 20 carbon atoms, or substituted or unsubstituted heteroalkyl having two or more carbon atomsAn unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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;

According to an embodiment of the invention, wherein Y₁-Y₂Selected from CR, identically or differently at each occurrence_y1Or N; y is₃-Y₆Selected from CR, identically or differently at each occurrence_y1、CR_y2Or N, and Y₃-Y₆At least one of them is selected from CR_y2And said R is_y2Having the formula-L-SiR_s1R_s2R_s3The structure of (1);

R_s1，R_s2，R_s3each occurrence, the same or different, is 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;

l 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;

According to an embodiment of the invention, wherein Y₂Selected from the group consisting of CR_y1Or CR_y2(ii) a The R is_y1Selected from the group consisting of: substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3 to 20 ring carbon atoms, and combinations thereof; the R is_y2has-L₁-SiR_s1R_s2R_s3The structure of (1); r_s1，R_s2，R_s3Each occurrence, the same or different, is 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 aryloxy having 2 to 20 carbon atomsSubstituted 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 group, ester group, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof; l is₁Selected 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;

According to one embodiment of the present invention, wherein Y₁-Y₆Each independently selected from CR_y1Or CR_y2And Y is₁-Y₆At least one of which is selected from CR_y2Said R is_y2has-L₁-SiR_s1R_s2R_s3In which L is₁Selected from single bonds, R_s1、R_s2And R_s3Each independently selected from the group consisting of: 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 aryl groups having 6 to 30 carbon atoms, and combinations thereof; and R is_s1、R_s2And R_s3At least one or two of which are each independently 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, or combinations thereof.

According to one embodiment of the present invention, wherein Y₂And Y₄At least one of CR is selected from_y2Said R is_y2has-L₁-SiR_s1R_s2R_s3Structure of (1), wherein L₁Selected from single bonds, R_s1、R_s2And R_s3Each independently selected from the group consisting of: 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 aryl groups having 6 to 30 carbon atoms, and combinations thereof; and R is_s1、R_s2And R_s3At least one or two of which are each independently 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, or combinations thereof.

According to one embodiment of the present invention, wherein Y₂Or Y₄Selected from the group consisting of CR_y2Said R is_y2has-L₁-SiR_s1R_s2R_s3In which L is₁Selected from single bonds, R_s1、R_s2And R_s3Each independently selected from the group consisting of: 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 aryl groups having 6 to 30 carbon atoms, and combinations thereof; and R is_s1、R_s2And R_s3At least one or two of which are each independently 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, or combinations thereof.

According to an embodiment of the invention, wherein Y₁-Y₆Each independently selected from CR_y1Or CR_y2And Y is₃-Y₆At least one of which is selected from CR_y2Said R is_y2has-L₁-SiR_s1R_s2R_s3In which L is₁Selected from single bonds, R_s1、R_s2And R_s3Each independently selected from the group consisting of: 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 aryl groups having 6 to 30 carbon atoms, and combinations thereof; and R is_s1、R_s2And R_s3At least one or two of which are each independently 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, or combinations thereof.

According to one embodiment of the invention, wherein R_s1、R_s2And R_s3Each independently selected from the group consisting of: methyl, ethyl, isopropyl, isobutyl, tert-butyl, neopentyl, cyclopentyl, cyclopentylmethyl, cyclohexyl, norbornyl, adamantyl, trifluoromethyl, phenyl, and combinations thereof.

According to an embodiment of the present invention, wherein L_aEach occurrence being selected identically or differently from L_a1To L_a319The group consisting of_a1To L_a319See claim 24 for specific structure of (a).

According to an embodiment of the present invention, wherein L_bEach occurrence being selected identically or differently from L_b1To L_b322Group of (I), L_cEach occurrence being selected identically or differently from L_c1To L_c231A group of (a); said L_b1To L_b322And L_c1To L_c231See claim 25 for specific structure of (a).

According to one embodiment of the invention, wherein the second compound has Ir (L)_a)₂(L_b) Or Ir (L)_a)₂(L_c) Or Ir (L)_a)(L_c)₂The structure of (1); wherein when the second compound has Ir (L)_a)₂(L_b) In the structure of (1), L_aEach occurrence being selected identically or differently from L_a1To L_a319Any one or any two of the group consisting of, L_bIs selected from the group consisting of L_b1To L_b322Any one of the group consisting of; when the second compound has Ir (L)_a)₂(L_c) In the structure of (1), L_aEach occurrence being selected identically or differently from L_a1To L_a319Any one or any two of the group consisting of, L_cIs selected from the group consisting of L_c1To L_c231Any one of the group consisting of; when the second compound has Ir (L)_a)(L_c)₂In the structure of (1), L_aIs selected from the group consisting of L_a1To L_a319Any one of the group consisting of L_cEach occurrence, identically or differently, of a group selected from L_c1To L_c231Any one or any two of the group consisting of.

According to one embodiment of the present invention, wherein the second compound is selected from the group consisting of compound 1 to compound 616, and the specific structures of compound 1 to compound 616 are shown in claim 26.

According to an embodiment of the present invention, wherein the organic layer is a light emitting layer, the first compound is a host material, and the second compound is a light emitting material.

According to one embodiment of the invention, wherein the device emits red or white light.

According to an embodiment of the present invention, wherein the organic layer further includes a third compound having a structure as shown in any one of formulas 3-1 to 3-3:

in formulae 3-1 to 3-3, Ar₃₁To Ar₃₅Each occurrence, identically or differently, is selected from substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms;

L₃₁to L₃₅Each occurrence, the same or different, 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;

x is selected, identically or differently on each occurrence, from CR_x1R_x2、NR_x3O or S;

R₃₁-R₃₇the same or different at each occurrence denotes mono-, poly-or unsubstituted;

R₃₁-R₃₇、R_x1-R_x3each occurrence, the same or different, is selected from the group consisting of:hydrogen, deuterium, halogen, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted heteroalkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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, substituted or unsubstituted arylsilyl groups having 6 to 20 carbon atoms, substituted or unsubstituted amino groups having 0 to 20 carbon atoms, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof;

adjacent substituents R₃₁-R₃₇Can optionally be linked to form a ring.

In this example, the adjacent substituents R₃₁-R₃₇Can optionally be linked to form a ring, are intended to mean wherein adjacent groups of substituents, for example, adjacent substituents R₃₁Between, adjacent substituents R₃₂Between, adjacent substituents R₃₃Between, adjacent substituents R₃₁And R₃₂Adjacent substituents R₃₂And R₃₃Adjacent substituents R₃₄Between, adjacent substituents R₃₅Adjacent substituents R₃₆Between, adjacent substituents R₃₇Between, adjacent substituents R₃₄And R₃₅Between, adjacent substituents R₃₅And R₃₆And adjacent substituents R₃₆And R₃₇Any one or more of these adjacent substituent groups can be linked to form a ring. Obviously, none of these adjacent substituent groups may be linked to form a ring.

According to an embodiment of the present invention, wherein the organic layer is a light emitting layer, and the third compound is a host material.

According to an embodiment of the present invention, wherein, in formula 3-1, adjacent substituents R₃₁、R₃₂、R₃₃At least one group of the groups is connected to form a ring.

According to an embodiment of the present invention, wherein, in formula 3-1, adjacent substituents R₃₁、R₃₂、R₃₃At least one group of the two groups is connected to form a ring, and the formed ring at least comprises 1 six-membered ring.

According to an embodiment of the present invention, wherein the third compound has a structure represented by one of formulas 3-11 to 3-21:

wherein, in formulae 3-11 to 3-21,

Ar₃₁each occurrence, identically or differently, is selected from substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms;

L₃₁each occurrence, the same or different, 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;

R₃₁、R₃₂、R₃₃、R₃₈the same or different at each occurrence denotes mono-, poly-or unsubstituted;

R₃₁、R₃₂、R₃₃、R₃₈、R_x1-R_x3the occurrences being the same or different selected from the group consisting of: hydrogen, deuterium, halogen, substituted or notA substituted 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, a substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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, substituted or unsubstituted amino, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof, having from 0 to 20 carbon atoms;

adjacent substituents R₃₁、R₃₂、R₃₃、R₃₈Can optionally be linked to form a ring.

In this example, the adjacent substituents R₃₁、R₃₂、R₃₃、R₃₈Can optionally be linked to form a ring is intended to mean where adjacent groups of substituents, e.g. adjacent substituents R₃₁Between, adjacent substituents R₃₂Adjacent substituents R₃₃Adjacent substituents R₃₁And R₃₂Adjacent substituents R₃₂And R₃₃Between, adjacent substituents R₃₁And R₃₈Adjacent substituents R₃₂And R₃₈And adjacent substituents R₃₃And R₃₈And any one or more of these adjacent substituent groups can be linked to form a ring. Obviously, these adjacent substituent groups may not be connected to form a ring.

According to an embodiment of the present invention, wherein, in formulae 3-11 to 3-21, R is₃₁-R₃₈Each occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, halogen, cyano, hydroxy,a mercapto group, a substituted or unsubstituted alkyl group having 1 to 20 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, and combinations thereof;

said L₃₁Each occurrence, the same or different, is selected from the group consisting of: a single bond, substituted or unsubstituted arylene of 6 to 18 carbon atoms, substituted or unsubstituted heteroarylene of 3 to 18 carbon atoms, and combinations thereof;

ar is₃₁、R_x1-R_x3Each occurrence, the same or different, is selected from the group consisting of: substituted or unsubstituted aryl groups having 6 to 18 carbon atoms, substituted or unsubstituted heteroaryl groups having 3 to 18 carbon atoms, and combinations thereof.

According to an embodiment of the present invention, wherein, in formulae 3-11 to 3-21, R is₃₁-R₃₈Each occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, fluorine, cyano, hydroxyl, mercapto, methyl, trideuteromethyl, vinyl, phenyl, biphenyl, naphthyl, 4-cyanophenyl, dibenzofuranyl, dibenzothiophenyl, triphenylene, carbazolyl, 9-phenylcarbazolyl, 9, 9-dimethylfluorenyl, pyridyl, phenylpyridinyl, and combinations thereof;

said L is₃₁Selected from the group consisting of: a single bond, phenylene, naphthylene, biphenylene, terphenylene, triphenylene, pyridylene, thienylene, dibenzofuranylene, dibenzothiophenylene, and combinations thereof;

ar is₃₁、R_x1-R_x3Each occurrence, the same or different, is selected from the group consisting of: phenyl, deuterated phenyl, methylphenyl, fluorophenyl, tert-butylphenyl, trideuteromethylphenyl, biphenyl, naphthyl, deuterated naphthyl, dibenzofuranyl, dibenzothiophenyl, 9, 9-dimethylfluorenyl, carbazolyl, pyridinyl, pyrimidinyl, 4-cyanophenyl, 3-cyanophenyl, triphenylene, and combinations thereof.

According to one embodiment of the inventionWherein, in formulae 3-1 to 3-3, the R₃₁-R₃₇Each occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted alkenyl groups having 2 to 20 carbon atoms, substituted or unsubstituted aryl groups having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3 to 30 carbon atoms, and combinations thereof;

said L₃₁To L₃₅Each occurrence, the same or different, is selected from the group consisting of: a single bond, substituted or unsubstituted arylene of 6 to 18 carbon atoms, substituted or unsubstituted heteroarylene of 3 to 18 carbon atoms, and combinations thereof;

ar is₃₁To Ar₃₅、R_x1-R_x3Each occurrence, the same or different, is selected from the group consisting of: substituted or unsubstituted aryl groups having 6 to 18 carbon atoms, substituted or unsubstituted heteroaryl groups having 3 to 18 carbon atoms, and combinations thereof.

According to an embodiment of the present invention, wherein, in formulae 3-1 to 3-3, R is₃₁-R₃₇Each occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, fluorine, cyano, hydroxyl, mercapto, methyl, trideuteromethyl, vinyl, phenyl, biphenyl, naphthyl, 4-cyanophenyl, dibenzofuranyl, dibenzothiophenyl, triphenylene, carbazolyl, 9-phenylcarbazolyl, 9, 9-dimethylfluorenyl, pyridyl, phenylpyridinyl, and combinations thereof;

said L₃₁To L₃₅Selected from the group consisting of: a single bond, phenylene, naphthylene, biphenylene, terphenylene, triphenylene, pyridylene, thienylene, dibenzofuranylene, dibenzothiophenylene, and combinations thereof;

ar is₃₁To Ar₃₅、R_x1-R_x3Each occurrence, the same or different, is selected from the group consisting of: phenyl, deuterated phenyl, methylphenyl, fluorophenyl, tert-butylphenyl, trideuteromethylphenyl, biphenyl, naphthyl, deuteratedNaphthyl, dibenzofuranyl, dibenzothienyl, 9, 9-dimethylfluorenyl, carbazolyl, pyridyl, pyrimidinyl, 4-cyanophenyl, 3-cyanophenyl, triphenylene, and combinations thereof.

According to one embodiment of the present invention, wherein the third compound is selected from the group consisting of compound H-1 to compound H-136, and the specific structures of the compound H-1 to compound H-136 are shown in claim 31.

According to one embodiment of the present invention, wherein the hydrogen energy in the structures of said compound H-1 to compound H-136 is partially or completely substituted by deuterium.

According to one embodiment of the present invention, a display assembly is disclosed that includes an electroluminescent device having a specific structure as shown in any of the foregoing embodiments.

According to an embodiment of the invention, a combination of compounds is also disclosed, wherein at least the first compound and the second compound are included.

In this embodiment, the first compound and the second compound may be further selected from the structures described in any of the preceding embodiments.

According to an embodiment of the invention, wherein the combination of compounds further comprises a third compound having a structure as shown in any one of the preceding.

In combination with other materials

The materials described herein for use in particular layers in an organic light emitting device may be used in combination with various other materials present in the device. Combinations of these materials are described in detail in U.S. patent application Ser. No. 0161 (paragraph 0132-0161) of US2016/0359122A1, the entire contents of which are incorporated herein by reference. The materials described or referenced therein are non-limiting examples of materials that may be used in combination with the compounds disclosed herein, and one skilled in the art can readily review the literature to identify other materials that may be used in combination.

Materials described herein as useful for particular layers in organic light emitting devices can be used in combination with a variety of other materials present in the device. For example, the compound combinations disclosed herein may be used in conjunction with a variety of light emitting dopants, hosts, transport layers, barrier layers, injection layers, electrodes, and other layers that may be present. Combinations of these materials are described in detail in U.S. patent application Ser. No. US2015/0349273A1, paragraph 0080-0101, the entire contents of which are incorporated herein by reference. The materials described or referenced therein are non-limiting examples of materials that may be used in combination with the compounds disclosed herein, and one skilled in the art can readily review the literature to identify other materials that may be used in combination.

The preparation methods of the first compound, the second compound and the third compound are not limited, and can be obtained commercially by those skilled in the art, or can be obtained easily by referring to the preparation methods in the prior art, or can be obtained by referring to patent applications with application numbers of US16481644, US15770215 and CN2020114924937, and are not described herein again.

The method of fabricating the electroluminescent device is not limited, and the method of fabricating the following examples is only an example and should not be construed as limiting. The preparation of the following examples can be reasonably modified by those skilled in the art in light of the prior art. For example, the ratio of each material in the light-emitting layer is not particularly limited, and those skilled in the art can reasonably select the material within a certain range according to the prior art, for example, the host material may account for 80% to 99% and the light-emitting material may account for 1% to 20% based on the total weight of the light-emitting layer material; or the main material can account for 90% -99%, and the luminescent material can account for 1% -10%. In addition, the host material may be one or two materials, wherein the proportion of the two host materials in the host material may be 100: 0 to 1: 99; alternatively, the ratio may be 80: 20 to 20: 80; alternatively, the ratio may be 60: 40 to 40: 60. in an embodiment of the device, the device characteristics are also tested using equipment conventional in the art (including, but not limited to, an evaporator manufactured by Angstrom Engineering, an optical test system manufactured by Fushida, Suzhou, an ellipsometer manufactured by Beijing Mass., etc.) in a manner well known to those skilled in the art. Since the relevant contents of the above-mentioned device usage, testing method, etc. are known to those skilled in the art, the inherent data of the sample can be obtained with certainty and without being affected, and therefore, the relevant contents are not described in detail in this patent.

Device example 1

First, a glass substrate, having an Indium Tin Oxide (ITO) anode 120nm thick, was cleaned and then treated with UV ozone and oxygen plasma. After the treatment, the substrate was dried in a glove box filled with nitrogen gas to remove moisture, and then the substrate was mounted on a substrate holder and loaded into a vacuum chamber. The organic layer specified below was in a vacuum of about 10 degrees^-8In the case of Torr

The rate of (a) was successively evaporated on the ITO anode by thermal vacuum. Compound HI was used as a Hole Injection Layer (HIL) with a thickness of

The compound HT is used as Hole Transport Layer (HTL) with a thickness of

Compound EB was used as an Electron Blocking Layer (EBL) with a thickness of

Then, the compound E-9 as a first host, the compound H-35 as a second host, and the compound 250 as a dopant were co-evaporated to be used as an emission layer (EML) with a thickness of

The 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-transporting layer (ETL) with a thickness of

Finally, evaporation

8-hydroxyquinoline-lithium (Liq) as an Electron Injection Layer (EIL) in thickness and evaporation deposited

As a cathode. The device was then transferred back to the glove box and encapsulated with a glass lid to complete the device.

Device example 2

Device example 2 was implemented in the same manner as device example 1 except that the compound 182 was used as a dopant instead of the compound 250 in the light emitting layer (EML).

Device example 3

Device example 2 was implemented in the same manner as device example 1, except that the compound 323 was used as a dopant instead of the compound 250 in the light emitting layer (EML).

Device example 4

Device example 2 was implemented in the same manner as device example 1, except that the compound 360 was used as a dopant instead of the compound 250 in the light emitting layer (EML).

Device example 5

Device example 5 was implemented in the same manner as device example 1, except that compound 484 was used as a dopant in place of compound 250 in the light emitting layer (EML).

Device comparative example 1

Device comparative example 1 was conducted in the same manner as in device example 1 except that the compound RH-a was used as a host instead of the compound E-9 and the compound H-35 in the light-emitting layer (EML) and the compound 484 was used as a dopant instead of the compound 250 (the weight ratio of the compound RH-a to the compound 484 was 98: 2).

Device comparative example 2

Device comparative example 2 was conducted in the same manner as in device example 1 except that the compound RH-a was used as a host in place of the compound E-9 and the compound H-35 in the light-emitting layer (EML) (the weight ratio of the compound RH-a to the compound 250 was 98: 2).

Device comparative example 3

Device comparative example 3 was implemented in the same manner as device example 2 except that the compound RH-a was used instead of the compound E-9 and the compound H-35 as a host in the light-emitting layer (EML) (the weight ratio of the compound RH-a to the compound 182 was 98: 2).

Device comparative example 4

Device comparative example 4 was conducted in the same manner as in device example 3 except that the compound RH-a was used as a host in place of the compound E-9 and the compound H-35 in the light-emitting layer (EML) (the weight ratio of the compound RH-a to the compound 323 was 98: 2).

Device comparative example 5

Device comparative example 5 was implemented in the same manner as in device example 4 except that the compound RH-a was used as a host in place of the compound E-9 and the compound H-35 in the light emitting layer (EML) (the weight ratio of the compound RH-a to the compound 360 was 98: 2).

The device layer structures and thicknesses are shown in the table below. Wherein more than one of the materials used is obtained by doping different compounds in the recited weight ratios.

TABLE 1 device structures of device examples and comparative examples

The material structure used in the device is as follows:

the IVL characteristics of the device were measured. Table 2 shows the results at 15mA/cm²Voltage (V) and External Quantum Efficiency (EQE) data measured at current density.

TABLE 2 device data

Device numbering	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

In table 2, the comparison of the data of examples 1 to 4 and comparative examples 2 to 5 shows that the high EQE level of the examples is greatly improved to a very high level, which fully shows the excellent characteristics of the combination of the host compound and the light emitting dopant compound selected in the present invention, such that the EQE can be significantly improved. In addition, the comparison of the voltage data of examples 1 to 4 and comparative examples 2 to 5 also fully demonstrates the low voltage advantage of the combination of the first and second compounds of the present invention. In addition, as can be seen from the comparison of example 5 and comparative example 1, the EQE increase amplitude of example 5 is also as high as 16.2%, and example 5 also has a lower voltage than comparative example 1. This result again confirms the unique advantage of the combination of the first and second compounds selected in the present invention that can bring about the significant increase and decrease in voltage of the EQE. These results show that the combination of the first compound and the second compound of the present invention can achieve a large improvement in device performance, demonstrating the superiority of the combination of the first compound and the second compound of the present invention.

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

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

Claims

1. An electroluminescent device, comprising:

an anode, a cathode, an anode and a cathode,

a cathode electrode, which is provided with a cathode,

the first compound has a structure represented by formula 1 a:

in the case of the formula 1a,

A₁-A₁₀each independently selected from C, CR_AOr N; and A is₁-A₁₀3 of (a) is C; wherein 2C are adjacent and are connected to the structure represented by formula 1 b; another C is linked to a structure represented by formula 1C:

v is selected from NR₂O or S;

the second compound is a metal complex and comprises a ligand L coordinated with the metal_aAnd the metal is selected from metals having a relative atomic mass greater than 40; l is a radical of an alcohol_aHas a structure represented by formula 2:

in formula 2, Z is selected from O, S or Se;

Y₁-Y₆selected from CR, identically or differently at each occurrence_y1、CR_y2Or N; the R is_y2has-L₁-SiR_s1R_s2R_s3The structure of (1);

2. The electroluminescent device of claim 1, wherein the first compound has a structure represented by one of formulas 1a-1 to 1 a-6:

in formulae 1a-1 to 1a-6,

A₁-A₁₀selected, identically or differently at each occurrence, from C, CR_AOr N; and A is₁-A₁₀Is C and is linked to a structure represented by formula 1C, formula 1C being as described in claim 1;

v is selected from NR₂O or S;

3. An electroluminescent device as claimed in claim 2 wherein V in formulae 1a-1 to 1a-6 is selected from O or S;

preferably, V in the formulas 1a-1 to 1a-6 is O.

4. An electroluminescent device as claimed in any one of claims 1 to 3 wherein R is_A，R₁And R₂Each occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted alkenyl groups having 2 to 20 carbon atoms, substituted or unsubstituted aryl groups having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3 to 30 carbon atoms, and combinations thereof;

preferably, wherein R is_A，R₁And R₂Each occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, fluorine, cyano, hydroxyl, mercapto, methyl, trideuteromethyl, vinyl, phenyl, biphenyl, naphthyl, 4-cyanophenyl, dibenzofuranyl, dibenzothiophenyl, triphenylene, carbazolyl, 9-phenylcarbazolyl, 9, 9-dimethylfluorenyl, pyridyl, phenylpyridinyl, and combinations thereof.

5. The electroluminescent device of any one of claims 1-4, wherein Ar in formula 1c has a structure represented by one of formulae 1c-1 to 1 c-3:

wherein the content of the first and second substances,

in the formula 1c-2, B₁-B₈Each occurrence of the same or different is selected from C, CR_BOr N;

adjacent substituents R_BAnd R_gCan optionally be linked to form a ring.

6. The electroluminescent device of claim 5, wherein Ar in formula 1c has a structure represented by one of formulae 1c-11 to 1 c-20:

in formulae 1c-11 to 1c-20, B₁-B_nSelected from CR, identically or differently at each occurrence_BOr N; b is_nCorresponding to said B₁-B₁₂The largest of the numbers present in any of formulae 1c-11 to 1c-20, G is selected from CR, the same or different at each occurrence_gR_g，SiR_gR_g，NR_g，BR_g，PR_gO, S or Se; when two exist at the same timeR is_gWhen two R are present_gMay be the same or different;

R_B，R_geach occurrence, the same or different, is 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 arylsilane groups having 6 to 20 carbon atoms, and combinations thereof;

adjacent substituents R_BAnd R_gCan optionally be linked to form a ring;

preferably, in formula 1c-11, B₁、B₃、B₅At least one of which is N and the others are each independently selected from CR_BOr N; b in formulae 1c-12 to 1c-20₁-B_nAt least one of them is N, said B_nCorresponding to the B₁-B₁₂The largest number among the groups represented by any one of the formulae 1c-12 to 1c-20, and the others are independently selected from CR_BOr N;

more preferably, in formula 1c-11, B₁、B₃、B₅Two or three of them are N, the others are each independently selected from CR_B(ii) a B in formulae 1c-12 to 1c-20₁-B_nAt least two of which are N, said B_nCorresponding to the B₁-B₁₂The largest number among the groups represented by any one of the formulae 1c-12 to 1c-20, and the others are independently selected from CR_B。

7. The electroluminescent device of claim 6, wherein R_BEach occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted alkenyl groups having 2 to 20 carbon atoms, substituted or unsubstituted aryl groups having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3 to 30 carbon atoms, and combinations thereof;

preferably, wherein R is_BEach occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, methyl, trideuteromethyl, vinyl, phenyl, biphenyl, naphthyl, 4-cyanophenyl, dibenzofuranyl, dibenzothiophenyl, triphenylene, carbazolyl, 9-phenylcarbazolyl, 9, 9-dimethylfluorenyl, pyridinyl, phenylpyridinyl, and combinations thereof.

8. The electroluminescent device as claimed in claim 6 or 7, wherein B in the formulae 1c-11 to 1c-20₁-B_nAt least one is CR_BSaid B is_nCorresponding to the B₁-B₁₂The largest number among the groups represented by any one of the formulae 1c-11 to 1c-20, and R_BSelected from the group consisting of: deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted alkenyl groups having 2 to 20 carbon atoms, substituted or unsubstituted aryl groups having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3 to 30 carbon atoms, and combinations thereof;

preferably, wherein B in said formula 1c-11 to formula 1c-20₁-B_nAt least one is CR_BSaid B is_nCorresponding to the B₁-B₁₂The largest number among the groups represented by any one of the formulae 1c-11 to 1c-20, and R_BSelected from the group consisting of: deuterium, methyl, trideuteromethyl, vinyl, phenyl, biphenyl, naphthyl, 4-cyanophenyl, dibenzofuranyl, dibenzothienyl, triphenylene, carbazolyl, 9-phenylcarbazolyl, 9, 9-dimethylfluorenyl, pyridylPhenylpyridyl, and combinations thereof.

9. The electroluminescent device of any one of claims 1-8, wherein said Ar is selected from the group consisting of the following structures:

wherein, optionally, the hydrogen in the above structure can be partially or fully substituted with deuterium.

10. The electroluminescent device of any one of claims 1-9, wherein L is selected from the group consisting of: a single bond, substituted or unsubstituted arylene of 6 to 18 carbon atoms, substituted or unsubstituted heteroarylene of 3 to 18 carbon atoms, and combinations thereof;

preferably, wherein said L is selected from the group consisting of: a single bond, phenylene, naphthylene, biphenylene, terphenylene, triphenylene, pyridylene, thienylene, dibenzofuranylene, dibenzothiophenylene, and combinations thereof.

11. The electroluminescent device of any of claims 1-10, wherein the first compound is selected from the group consisting of:

12. The electroluminescent device of claim 1, wherein in said formula 2, Y₁-Y₆Selected from CR, identically or differently at each occurrence_y1、CR_y2Or N, Y₁-Y₆At least one of them is selected from CR_y2And said R is_y2has-L₁-SiR_s1R_s2R_s3The structure of (1);

R_s1，R_s2，R_s3each occurrence, the same or different, is 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 cycloalkyl having 1 to 20 ring carbon atomsA heteroalkyl group of carbon atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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;

L₁selected from the group consisting of 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;

13. The electroluminescent device of claim 1, wherein in formula 2, X₁-X₄Two of which are adjacent to each other are C, and one of the C is bonded to the metal through a carbon-metal bond, X₁-X₄The one in the ortho position to the carbon-metal bond is selected from CR_xAnd R is_XSelected 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 alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroarylUnsubstituted 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 group, ester group, cyano, isocyano, hydroxyl, thiol, sulfinyl, sulfonyl, phosphino, and combinations thereof.

14. The electroluminescent device of claim 1, wherein in formula 2, X₁-X₈And Y₁-Y₆At least one of them is selected from CR_xOr CR_y1(ii) a And said R is_x，R_y1Each occurrence, the same or different, is selected from the group consisting of: deuterium, halogen, substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl group having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy group having 6 to 30 carbon atoms, 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, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof, having from 0 to 20 carbon atoms;

preferably, X₁-X₈And Y₁-Y₆At least two or three of them are selected from CR_xAnd/or CR_y1(ii) a And said R is_x，R_y1Each occurrence, the same or different, is selected from the group consisting of: deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstitutedA substituted or unsubstituted heteroalkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof.

15. The electroluminescent device of any one of claims 1-14, wherein in the second compound, the L_aHas a structure represented by formula 4:

wherein the content of the first and second substances,

z is selected from O or S;

X₃-X₈is selected, identically or differently on each occurrence, from CR_xOr N;

R_x，R_y1，R_s1，R_s2，R_s3each occurrence, the same or different, is 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, substitutedOr a substituted or unsubstituted heteroalkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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;

L₁selected from the group consisting of 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;

16. The electroluminescent device of any one of claims 1-15, wherein the second compound has M (L)_a)_m(L_b)_n(L_c)_qThe structure of (1);

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

L_a、L_band L_cOptionally linked to form a multidentate ligand;

R_a、R_b、R_c、R_N1、R_N2、R_C1And R_C2Each occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, halogen, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted heteroalkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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, substituted or unsubstituted arylsilyl groups having 6 to 20 carbon atoms, substitutedOr unsubstituted amino, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof, having from 0 to 20 carbon atoms;

17. The electroluminescent device of any one of claims 1-15, wherein the second compound has M (L)_a)_m(L_b)_n(L_c)_qThe structure of (1);

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

R_a1、R_b1、R_c1、R_N2Each occurrence, the same or different, is 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 cycloalkyl having 1 to 20 ring carbon atomsA heteroalkyl group of carbon atoms, a substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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, hydroxy, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

R_a、R_b、R_c、R_N3Each occurrence, the same or different, is 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 alkoxy having 6 to 30 carbon atomsSubstituted or unsubstituted alkenyl groups having 2 to 20 carbon atoms, substituted or unsubstituted aryl groups having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6 to 20 carbon atoms, substituted or unsubstituted amino groups having 0 to 20 carbon atoms, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof;

adjacent substituents R_a、R_b、R_cCan optionally be linked to form a ring.

18. The electroluminescent device of any one of claims 1-17, wherein the second compound has a structure represented by formula 5:

wherein the content of the first and second substances,

m is 1 or 2;

X₃-X₈selected from CR, identically or differently at each occurrence_xOr N;

R_x，R_y1，R_s1，R_s2，R_s3，R₁₁，R₁₂，R₁₃，R₁₄，R₁₅，R₁₆，R₁₇each occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstitutedA substituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted heteroalkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

adjacent substituents R₁₁，R₁₂，R₁₃，R₁₄，R₁₅，R₁₆，R₁₇Can optionally be linked to form a ring;

preferably, wherein R₁₁-R₁₃At least one or two of which 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 R₁₄-R₁₆At least one of which 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 combinations thereof;

more preferably, wherein R₁₁-R₁₃At least two of which 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; and/or R₁₄-R₁₆At least two of which 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.

19. An electroluminescent device as claimed in any one of claims 14 to 18 in which Y is₁-Y₆Each independently selected from CR_y1Or CR_y2。

20. An electroluminescent device as claimed in any one of claims 14 to 19 wherein Z is O.

21. An electroluminescent device as claimed in any one of claims 1 to 20 in which Y is₁-Y₂Selected from CR, identically or differently at each occurrence_y1Or N; y is₃-Y₆Selected from CR, identically or differently at each occurrence_y1、CR_y2Or N, and Y₃-Y₆At least one of which is selected from CR_y2Said R is_y2Having a radical of formula-L₁-SiR_s1R_s2R_s3The structure of (1);

R_y1each occurrence, the same or different, is 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 alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atomsOr unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

R_s1，R_s2，R_s3each occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted aralkyl groups having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy groups having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy groups having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl groups having 2 to 20 carbon atoms, substituted or unsubstituted aryl groups having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6 to 20 carbon atoms, substituted or unsubstituted amino, acyl, carbonyl, carboxylic acid group, ester group, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof, having from 0 to 20 carbon atoms;

adjacent substituents R_s1，R_s2，R_s3Can optionally be linked to form a ring;

preferably, R_s1，R_s2，R_s3Each occurrence, the same or different, is 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 aryl having 7 to 30 carbon atomsAn alkyl group, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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, and combinations thereof.

22. An electroluminescent device as claimed in any one of claims 1 to 20 in which Y is₁-Y₆Each independently selected from CR_y1Or CR_y2And Y is₁-Y₆At least one of which is selected from CR_y2Said R is_y2has-L₁-SiR_s1R_s2R_s3In which L is₁Selected from single bonds, R_s1、R_s2And R_s3Each independently selected from the group consisting of: 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 aryl groups having 6 to 30 carbon atoms, and combinations thereof; and R is_s1、R_s2And R_s3At least one or two of which are each independently 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, or combinations thereof;

preferably, Y₂And Y₄At least one of CR is selected from_y2；

More preferably, Y₂Or Y₄Selected from the group consisting of CR_y2。

23. An electroluminescent device as claimed in claim 21 or 22 in which R_s1、R_s2And R_s3Each independently selected from the group consisting of: methyl, ethyl, isopropyl, isobutyl, tert-butyl, neopentyl, cyclopentyl, cyclopentylmethyl, cyclohexyl, norbornyl, adamantyl, trifluoromethyl, phenyl, and combinations thereof.

24. An electroluminescent device as claimed in claim 1 in which L_aEach occurrence, the same or different, is selected from the group consisting of:

25. an electroluminescent device as claimed in any one of claims 16 to 24 wherein L_bEach occurrence, the same or different, is selected from the group consisting of:

wherein L is_cEach occurrence, the same or different, is selected from the group consisting of:

26. the electroluminescent device of any of claims 16-25, wherein the second compound has Ir (L)_a)₂(L_b) Or Ir (L)_a)₂(L_c) Or Ir (L)_a)(L_c)₂The structure of (1);

wherein when the second compound has Ir (L)_a)₂(L_b) In the structure of (1), L_aEach occurrence being selected identically or differently from L_a1To L_a319Any one or any two of the group consisting of, L_bIs selected from the group consisting of L_b1To L_b322Any one of the group consisting of; when the second compound has Ir (L)_a)₂(L_c) In the structure of (1), L_aEach occurrence being selected identically or differently from L_a1To L_a319Any one or any two of the group consisting of, L_cIs selected from the group consisting of L_c1To L_c231Any one of the group consisting of; when the second compound has Ir (L)_a)(L_c)₂In the structure of (1), L_aIs selected from the group consisting of L_a1To L_a319Any one of the group consisting of L_cEach occurrence, identically or differently, of a group selected from L_c1To L_c231Any one or any two of the group consisting of;

preferably wherein said second compound is selected from the group consisting of compound 1 to compound 616;

wherein said compound 1 to compound 496 have Ir (L)_a)₂(L_b) Wherein two L are_aSame, L_aAnd L_bEach corresponding to a structure selected from those listed in the following table:

wherein compounds 497 to 616 have Ir (L)_a)₂(L_b) Wherein two L are_aDifferent, L_aAnd L_bRespectively corresponding to the structures listed in the following table:

。

27. the electroluminescent device of any of claims 1-26, wherein the organic layer is a light emitting layer, the first compound is a host material, and the second compound is a light emitting material;

preferably, the device emits red or white light.

28. The electroluminescent device of any one of claims 1-27, wherein the organic layer further comprises a third compound having a structure as shown in any one of formulas 3-1 to 3-3:

in formulae 3-1 to 3-3, Ar₃₁To Ar₃₅Each occurrence, identically or differently, is selected 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;

R₃₁-R₃₇、R_x1-R_x3each occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, halogen, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted heteroalkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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, substituted or unsubstituted arylsilyl groups having 6 to 20 carbon atoms, substituted or unsubstituted amino groups having 0 to 20 carbon atoms, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof;

adjacent substituents R₃₁-R₃₇Can optionally be linked to form a ring;

preferably, the organic layer is a light emitting layer and the third compound is a host material.

29. The electroluminescent device of claim 28, wherein in formula 3-1, adjacent substituents R₃₁、R₃₂、R₃₃At least one group of the groups is connected to form a ring;

preferably, in formula 3-1, adjacent substituents R₃₁、R₃₂、R₃₃At least one group of the two groups is connected to form a ring, and the formed ring at least comprises 1 six-membered ring;

more preferably, the third compound has a structure represented by one of formulas 3-11 to 3-21:

wherein, in formulae 3-11 to 3-21,

R₃₁、R₃₂、R₃₃、R₃₈、R_x1-R_x3the occurrences being the same or different 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 heteroaryl groupsOr 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, carboxylic acid group, ester group, cyano group, isocyano group, hydroxyl group, mercapto group, sulfinyl group, sulfonyl group, phosphino group, and combinations thereof;

30. The electroluminescent device of claim 28 or 29, wherein R is₃₁-R₃₈Each occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted alkenyl groups having 2 to 20 carbon atoms, substituted or unsubstituted aryl groups having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3 to 30 carbon atoms, and combinations thereof;

ar is₃₁To Ar₃₅、R_x1-R_x3Each occurrence, the same or different, is selected from the group consisting of: substituted or unsubstituted aryl groups having 6 to 18 carbon atoms, substituted or unsubstituted heteroaryl groups having 3 to 18 carbon atoms, and combinations thereof;

preferably, wherein said R₃₁-R₃₈Each occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, fluorineCyano, hydroxy, mercapto, methyl, trideuteromethyl, vinyl, phenyl, biphenyl, naphthyl, 4-cyanophenyl, dibenzofuranyl, dibenzothiophenyl, triphenylene, carbazolyl, 9-phenylcarbazolyl, 9, 9-dimethylfluorenyl, pyridyl, phenylpyridyl, and combinations thereof;

said L is₃₁To L₃₅Selected from the group consisting of: a single bond, phenylene, naphthylene, biphenylene, terphenylene, triphenylene, pyridylene, thienylene, dibenzofuranylene, dibenzothiophenylene, and combinations thereof;

ar is₃₁To Ar₃₅、R_x1-R_x3Each occurrence, the same or different, is selected from the group consisting of: phenyl, deuterated phenyl, methylphenyl, fluorophenyl, tert-butylphenyl, trideuteromethylphenyl, biphenyl, naphthyl, deuterated naphthyl, dibenzofuranyl, dibenzothiophenyl, 9, 9-dimethylfluorenyl, carbazolyl, pyridinyl, pyrimidinyl, 4-cyanophenyl, 3-cyanophenyl, triphenylene, and combinations thereof.

31. The electroluminescent device of any one of claims 28 to 30, wherein the third compound is selected from the group consisting of:

32. A display assembly comprising an electroluminescent device as claimed in any one of claims 1 to 31.

33. A combination of compounds comprising at least a first compound and a second compound;

the first compound has a structure as represented by formula 1 a:

in formula 1a, A₁-A₁₀Each independently selected from C, CR_AOr N; and A is₁-A₁₀3 of (a) is C; wherein 2C are adjacent and are connected to the structure represented by formula 1 b; another C is linked to a structure represented by formula 1C:

v is selected from NR₂O or S;

R_A，R₁，R₂each occurrence, the same or different, is selected from the group consisting of: hydrogen, deuterium, halogen, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted heteroalkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group 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, substituted or unsubstituted arylsilane groups having 6 to 20 carbon atoms, substituted or unsubstituted amino groups having 0 to 20 carbon atoms, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof;

in formula 2, Z is selected from O, S or Se;

Y₁-Y₆selected from CR, identically or differently at each occurrence_y1、CR_y2Or N; the R is_y2Having a radical of formula-L₁-SiR_s1R_s2R_s3The structure of (1);

R_x，R_y1，R_s1，R_s2，R_s3each occurrence, the same or different, is 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 arylsilane groups having 6 to 20 carbon atoms, substituted or unsubstituted amino groups having 0 to 20 carbon atoms, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof;