An electroluminescent device

Abstract

An electroluminescent device is disclosed. The electroluminescent device comprises an anode, a cathode, and an organic layer disposed between the anode and the cathode, wherein the organic layer comprises a first compound having an H-L-E structure and a ligand L having a structure of formula C. a The invention discloses a novel material combination composed of the first compound and the second compound. The novel material combination composed of the first compound and the second compound can obtain higher efficiency and greatly improve the life span in the device, and can provide better device performance. Also disclosed is a display component including the electroluminescent device and a compound combination.

Description

Technical Field

[0001] The present invention relates to an electronic device, such as an electroluminescent device. More particularly, it relates to a method of forming an organic layer comprising a first compound having a HLE structure and a ligand L having a structure of formula C. a An electroluminescent device of a novel material combination of the second compound. Background Art

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

[0003] In 1987, Tang and Van Slyke of Eastman Kodak reported a double-layer organic electroluminescent device, which included an arylamine hole transport layer and a tri-8-hydroxyquinoline-aluminum layer as an electron transport layer and a light-emitting layer (Applied Physics Letters, 1987, 51 (12): 913-915). Once a bias voltage is applied to the device, green light is emitted from the device. This invention laid the foundation for the development of modern organic light-emitting diodes (OLEDs). The most advanced OLEDs can include multiple layers, such as charge injection and transport layers, charge and exciton blocking layers, and one or more light-emitting layers between the cathode and the anode. Since OLEDs are self-luminous solid-state devices, they offer great potential for display and lighting applications. In addition, the inherent properties of organic materials, such as their flexibility, can make them very suitable for special applications, such as on flexible substrates.

[0004] OLEDs can be divided into three different types based on their light emission mechanism. The OLED invented by Tang and van Slyke is a fluorescent OLED. It uses only singlet light emission. The triplet generated in the device is wasted through non-radiative decay channels. Therefore, the internal quantum efficiency (IQE) of fluorescent OLEDs is only 25%. This limitation has hindered the commercialization of OLEDs. In 1997, Forrest and Thompson reported phosphorescent OLEDs, which used triplet light emission from heavy metals containing complexes as emitters. Therefore, singlet and triplet states can be harvested, achieving 100% IQE. Due to its high efficiency, the discovery and development of phosphorescent OLEDs directly contributed to the commercialization of active matrix OLEDs (AMOLEDs). Recently, Adachi achieved high efficiency through thermally activated delayed fluorescence (TADF) of organic compounds. These emitters have a small singlet-triplet gap, making it possible for excitons to return from triplet to singlet. In TADF devices, triplet excitons can generate singlet excitons through reverse intersystem crossing, resulting in high IQE.

[0005] OLEDs can also be classified into small molecule and polymer OLEDs based on the form of the material used. Small molecules are any organic or organometallic material that is not a polymer. Small molecules can have a large molecular weight as long as they have a precise structure. Dendrimers with well-defined structures are considered small molecules. Polymer OLEDs include conjugated polymers and non-conjugated polymers with pendant luminescent groups. Small molecule OLEDs can become polymer OLEDs if post-polymerization occurs during the manufacturing process.

[0006] There are various OLED manufacturing methods. Small molecule OLEDs are usually manufactured by vacuum thermal evaporation. Polymer OLEDs are manufactured by solution methods such as spin coating, inkjet printing, and nozzle printing. Small molecule OLEDs can also be manufactured by solution methods if the material can be dissolved or dispersed in a solvent.

[0007] The emission color of OLED can be achieved by the structural design of the luminescent material. OLED can include one luminescent layer or multiple luminescent layers to achieve the desired spectrum. Green, yellow and red OLEDs, phosphorescent materials have been successfully commercialized. Blue phosphorescent devices still have problems such as blue unsaturation, short device life and high operating voltage. Commercial full-color OLED displays usually adopt a hybrid strategy, using blue fluorescence and phosphorescent yellow, or red and green. At present, the efficiency of phosphorescent OLEDs decreases rapidly under high brightness conditions, which is still a problem. In addition, it is expected to have a more saturated emission spectrum, higher efficiency and longer device life.

[0008] US20180337340A1 discloses an organic electroluminescent compound and an organic electroluminescent device comprising the same, which comprises an organic layer, wherein the organic layer contains one or more hosts, and the first host is an organic optical compound having the following structure:

[0009] However, it does not disclose or teach the special advantages of using the compound together with a phosphorescent material of a specific structure, nor does it deeply study the special advantages of using other compounds with similar carbazole-fused macrocyclic structures together with a phosphorescent material of a specific structure.

[0010] In order to meet the industry's increasing demands for various aspects of electroluminescent device performance, such as luminescent color, luminescent color saturation, driving voltage, luminescent efficiency, device life, etc., research related to phosphorescent devices is still in urgent need of further study. In the research of phosphorescent devices, the combination of phosphorescent luminescent materials and host materials is very important. The selection of the combination of phosphorescent luminescent materials and host materials is directly related to the luminescent performance of the device. Therefore, the selection and optimization of the combination of phosphorescent luminescent materials and host materials is an important part of the industry's related research. Summary of the invention

[0011] The present invention aims to provide an electroluminescent device with a novel material combination to solve at least part of the above problems. The organic layer of the electroluminescent device comprises a first compound having an HLE structure and a ligand L having a structure of formula C. a The invention discloses a novel material combination composed of a second compound and a second compound, which can be used in the light-emitting layer of an electroluminescent device. The novel material combination can obtain higher efficiency and greatly improve the life span in the device, and can provide better device performance.

[0012] According to one embodiment of the present invention, an electroluminescent device is disclosed, which includes an anode, a cathode, and an organic layer disposed between the anode and the cathode, wherein the organic layer includes at least a first compound and a second compound;

[0013] The first compound has a structure of HLE, and the H has a structure represented by formula A:

[0014]

[0015] In formula A,

[0016] Each time Z1-Z3, Z6-Z8 appears, they are selected from CR z1 or N, Z4 and Z5 appear the same or differently each time

[0017] Selected from CR z2 , and the two substituents R in Z4 and Z5 z2Connect to form a ring;

[0018] 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;

[0019] E 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;

[0020] R z1 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 6 to 30 carbon atoms Aryloxy, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0021] R z2 Each occurrence is identically or differently selected from the group consisting of: hydrogen, 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 cycloalkyl having 6 to 30 carbon atoms substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0022] Adjacent substituent R z1 , R z2can optionally be linked to form a ring;

[0023] The second compound is a metal complex, wherein the metal is selected from metals with a relative atomic mass greater than 40, and the metal complex comprises a ligand L a , the L a Having a structure represented by Formula C:

[0024]

[0025] In formula C, ring A and ring B are each independently selected from a five-membered unsaturated carbocyclic ring, an aromatic ring having 6 to 30 carbon atoms, or a heteroaromatic ring having 3 to 30 carbon atoms;

[0026] R i Each occurrence of R is the same or different, indicating mono-, poly- or unsubstituted; ii Each occurrence of the same or different means mono-, poly- or no-substitution;

[0027] Y is selected from SiR y R y ,GeR y R y , NR y , P.R. y , O, S or Se;

[0028] When there are two R y When two R y Can be the same or different;

[0029] X1-X2 are selected from CR in the same or different ways each time they appear x or N;

[0030] R, R i , R ii , R x and R yEach occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 6 to 30 carbon atoms Aryloxy, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0031] Adjacent substituent R i , R x , R y , R and R ii Can optionally be linked to form a ring.

[0032] According to another embodiment of the present invention, a display assembly is also disclosed, which includes the electroluminescent device as described above.

[0033] According to another embodiment of the present invention, there is also disclosed a compound combination, which includes at least a first compound and a second compound;

[0034] Wherein, the first compound has a structure of HLE, and the H has a structure represented by formula A:

[0035]

[0036] In formula A,

[0037] Each time Z1-Z3, Z6-Z8 appears, they are selected from CR z1 or N, Z4 and Z5 appear the same or differently each time

[0038] Selected from CR z2 , and the two substituents R in Z4 and Z5 z2 Connect to form a ring;

[0039] 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;

[0040] E 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;

[0041] R z1 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 6 to 30 carbon atoms Aryloxy, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0042] R z2 Each occurrence is identically or differently selected from the group consisting of: hydrogen, 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 cycloalkyl having 6 to 30 carbon atoms substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0043] Adjacent substituent R z1 , R z2 can optionally be linked to form a ring;

[0044] The second compound is a metal complex, wherein the metal is selected from metals with a relative atomic mass greater than 40, and the metal complex comprises a ligand L a , the La Having a structure represented by Formula C:

[0045]

[0046] In formula C, ring A and ring B are each independently selected from a five-membered unsaturated carbocyclic ring, an aromatic ring having 6 to 30 carbon atoms, or a heteroaromatic ring having 3 to 30 carbon atoms;

[0047] R i Each occurrence of R is the same or different, indicating mono-, poly- or unsubstituted; ii Each occurrence of the same or different means mono-, poly- or no-substitution;

[0048] Y is selected from SiR y R y ,GeR y R y , NR y , P.R. y , O, S or Se;

[0049] When there are two R y When two R y Can be the same or different;

[0050] X1-X2 are selected from CR in the same or different ways each time they appear x or N;

[0051] R, R i , R ii , R x and R y Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 6 to 30 carbon atoms Aryloxy, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0052] Adjacent substituent R i , Rx , R y , R and R ii Can optionally be linked to form a ring.

[0053] The present invention discloses a novel electroluminescent device, wherein the electroluminescent device uses a first compound having an HLE structure and a ligand L having a structure of formula C. a The invention discloses a novel material combination composed of a first compound and a second compound, which can be used in the light-emitting layer of an electroluminescent device. The novel material combination can enable the novel electroluminescent device to obtain higher efficiency and greatly improve the life span, and can provide better device performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 is a schematic diagram of an organic light-emitting device that may contain the electroluminescent device disclosed herein.

[0055] Figure 2 is a schematic diagram of another organic light-emitting device that may contain the electroluminescent device disclosed herein. DETAILED DESCRIPTION

[0056] OLEDs can be manufactured on a variety of substrates, such as glass, plastic, and metal. Figure 1 An organic light-emitting device 100 is shown schematically and non-limitingly. The figure is not necessarily drawn to scale, and some layer structures in the figure may be omitted as needed. 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, a light-emitting layer 150, a hole blocking layer 160, an electron transport layer 170, an electron injection layer 180 and a cathode 190. The device 100 can be manufactured by depositing the described layers in sequence. The properties and functions of each layer and exemplary materials are described in more detail in columns 6-10 of U.S. Patent No. 7,279,704 B2, the entire contents of which are incorporated herein by reference.

[0057] There are more examples of each of these layers. For example, a flexible and transparent substrate-anode combination is disclosed in U.S. Patent No. 5,844,363, which is incorporated by reference in its entirety. An example of a p-doped hole transport layer is m-MTDATA doped with F4-TCNQ at a molar ratio of 50:1, as disclosed in U.S. Patent Application Publication No. 2003 / 0230980, which is incorporated by reference in its entirety. An example of a host material is 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. U.S. Patent Nos. 5,703,436 and 5,707,745, which are incorporated by reference in their entirety, disclose examples of cathodes including composite cathodes having a thin layer of metal such as Mg:Ag with an overlying transparent, conductive, sputter-deposited ITO layer. 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 protective layers can be found in U.S. Patent Application Publication No. 2004 / 0174116, which is incorporated by reference in its entirety.

[0058] The above layered structure is provided by way of non-limiting example. The functions of an OLED can be achieved by combining the various layers described above, or some layers can be omitted entirely. It can also include other layers not explicitly described. Within each layer, a single material or a mixture of multiple materials can be used to achieve optimal performance. Any functional layer can include several sublayers. For example, a light-emitting layer can have two layers of different light-emitting materials to achieve a desired light-emitting spectrum.

[0059] 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.

[0060] OLED also requires encapsulation layers, such as Figure 2 The organic light emitting device 200 is schematically and non-limitingly shown. Figure 1The difference is 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 that can provide an encapsulation function can be used as an encapsulation layer, such as glass or an organic-inorganic hybrid layer. The encapsulation layer should be placed directly or indirectly on the outside of the OLED device. Multilayer thin film encapsulation is described in U.S. Patent No. 7,968,146 B2, the entire contents of which are incorporated herein by reference.

[0061] Devices manufactured according to embodiments of the present invention can be incorporated into various consumer products having one or more electronic component modules (or units) of the device. Some examples of these consumer products include flat panel displays, monitors, medical monitors, televisions, billboards, lights for indoor or outdoor lighting and / or signaling, 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, micro displays, 3-D displays, vehicle displays, and taillights.

[0062] The materials and structures described herein may also be used in other organic electronic devices listed above.

[0063] As used herein, "top" means farthest from the substrate, while "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. Unless it is specified that the first layer is "in contact with" the second layer, other layers may be present between the first and second layers. For example, a cathode may be described as being "disposed" "on" an anode even though various organic layers are present between the cathode and the anode.

[0064] 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.

[0065] A ligand may be referred to as "photoactive" when it is believed that the ligand directly contributes to the photoactive property 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 property of the emissive material, but the ancillary ligand may alter the properties of the photoactive ligand.

[0066] It is believed that the internal quantum efficiency (IQE) of fluorescent OLEDs can exceed the 25% spin-statistical limit through delayed fluorescence. Delayed fluorescence can generally be divided into two types, namely P-type delayed fluorescence and E-type delayed fluorescence. P-type delayed fluorescence is generated by triplet-triplet annihilation (TTA).

[0067] On the other hand, E-type delayed fluorescence does not rely on the collision of two triplets, but on the conversion between triplet and singlet excited state. Compounds capable of producing E-type delayed fluorescence need to have a very small single-triplet gap for the conversion between energy states. Thermal energy can activate the transition from triplet back to singlet. This type of delayed fluorescence is also called thermally activated delayed fluorescence (TADF). The notable feature of TADF is that the delayed component increases with increasing temperature. If the reverse intersystem crossing (RISC) rate is fast enough to minimize the non-radiative decay by triplet, the fraction of backfilling singlet excited state may reach 75%. The total singlet fraction can be 100%, far exceeding the 25% of the spin statistics of the excitons generated by electricity.

[0068] The E-type delayed fluorescence feature can be seen in an exciplex system or a single compound. Without being bound by theory, it is believed that the E-type delayed fluorescence requires the luminescent material to have a small singlet-triplet energy gap (ΔE S-T ). Organic non-metal-containing donor-acceptor luminescent materials may be able to achieve this. The emission of these materials is usually characterized by donor-acceptor charge transfer (CT) type emission. The spatial separation of the HOMO and LUMO in these donor-acceptor type compounds usually produces a small ΔE S-T These states may include CT states. Generally, donor-acceptor light-emitting materials are constructed by linking an electron donor moiety (eg, an amino group or a carbazole derivative) to an electron acceptor moiety (eg, a six-membered aromatic ring containing N).

[0069] Definition of Substituent Terms

[0070] Halogen or halide - as used herein includes fluorine, chlorine, bromine and iodine.

[0071] Alkyl - as used herein, includes straight chain and branched 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, and 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.

[0072] Cycloalkyl - as used herein, includes cyclic alkyl. Cycloalkyl can be a cycloalkyl having 3 to 20 ring carbon atoms, preferably a cycloalkyl having 4 to 10 carbon atoms. Examples of cycloalkyl include cyclobutyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4,4-dimethylcyclohexyl, 1-adamantyl, 2-adamantyl, 1-norbornyl, 2-norbornyl, etc. Among the above, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4,4-dimethylcyclohexyl are preferred. In addition, cycloalkyl can be optionally substituted.

[0073] Assorted alkyl - as used herein, assorted alkyl comprises one or more carbons in the alkyl chain and is selected from the group consisting of nitrogen atom, oxygen atom, sulfur atom, selenium atom, phosphorus atom, silicon atom, germanium atom and boron atom and is replaced by heteroatoms. Assorted alkyl can be an assorted alkyl with 1 to 20 carbon atoms, preferably an assorted alkyl with 1 to 10 carbon atoms, more preferably an assorted alkyl with 1 to 6 carbon atoms. The example of assorted alkyl includes methoxymethyl, ethoxymethyl, ethoxyethyl, methylthiomethyl, ethylthiomethyl, ethylthioethyl, methoxymethoxymethyl, ethoxymethoxymethyl, ethoxyethoxyethyl, hydroxymethyl, hydroxyethyl, hydroxypropyl, mercaptomethyl, mercaptoethyl, mercaptopropyl, aminomethyl, aminoethyl, aminopropyl, dimethylaminomethyl, trimethylsilyl, dimethylethylsilyl, dimethylisopropylsilyl, tert-butyldimethylsilyl, triethylsilyl, triisopropylsilyl, trimethylsilylmethyl, trimethylsilylethyl, trimethylsilylisopropyl. Additionally, heteroalkyl groups can be optionally substituted.

[0074] Alkenyl - as used herein, encompasses straight chain, branched and cyclic olefin groups. Alkenyl can be an alkenyl containing 2 to 20 carbon atoms, preferably an alkenyl having 2 to 10 carbon atoms. Examples of alkenyl include vinyl, propenyl, 1-butenyl, 2-butenyl, 3-butenyl, 1,3-butadienyl, 1-methylvinyl, styryl, 2,2-diphenylvinyl, 1,2-diphenylvinyl, 1-methylallyl, 1,1-dimethylallyl, 2-methylallyl, 1-phenylallyl, 2-phenylallyl, 3-phenylallyl, 3,3-diphenylallyl, 1,2-dimethylallyl, 1-phenyl-1-butenyl, 3-phenyl-1-butenyl, cyclopentenyl, cyclopentadienyl, cyclohexenyl, cycloheptenyl, cycloheptatrienyl, cyclooctenyl, cyclooctatetraenyl and norbornenyl. Additionally, alkenyl groups may be optionally substituted.

[0075] Alkynyl - as used herein, encompasses straight chain alkynyl. Alkynyl may be an alkynyl containing 2 to 20 carbon atoms, preferably an alkynyl 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, etc. Among the above, ethynyl, propynyl, propargyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-pentynyl, phenylethynyl, etc. are preferred. In addition, alkynyl may be optionally substituted.

[0076] Aryl or aromatic group - As used herein, both 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, and more preferably an aryl group having 6 to 12 carbon atoms. Examples of aryl groups include phenyl, biphenyl, terphenyl, triphenylene, tetraphenylene, naphthalene, anthracene, phenanthrene, fluorene, pyrene, Perylene and azulene, preferably phenyl, biphenyl, terphenyl, triphenylene, fluorene and naphthalene. Examples of non-condensed aryl groups include phenyl, biphenyl-2-yl, biphenyl-3-yl, biphenyl-4-yl, p-terphenyl-4-yl, p-terphenyl-3-yl, p-terphenyl-2-yl, m-terphenyl-4-yl, m-terphenyl-3-yl, m-terphenyl-2-yl, o-tolyl, m-tolyl, p-tolyl, p-(2-phenylpropyl)phenyl, 4'-methylbiphenyl, 4"-tert-butyl-p-terphenyl-4-yl, o-cumyl, m-cumyl, p-cumyl, 2,3-xylyl, 3,4-xylyl, 2,5-xylyl, mesityl and m-quadrenyl. In addition, the aryl group may be optionally substituted.

[0077] Heterocyclic or heterocyclic - as used herein, non-aromatic cyclic groups are contemplated. Non-aromatic heterocyclic groups include saturated heterocyclic groups having 3-20 ring atoms and unsaturated non-aromatic heterocyclic groups having 3-20 ring atoms, wherein at least one ring atom is selected from the group consisting of nitrogen atoms, oxygen atoms, sulfur atoms, selenium atoms, silicon atoms, phosphorus atoms, germanium atoms and boron atoms, and preferred non-aromatic heterocyclic groups are those having 3 to 7 ring atoms, including at least one heteroatom such as nitrogen, oxygen, silicon or sulfur. Examples of non-aromatic heterocyclic groups include oxirane, oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, dioxopentanyl, dioxanyl, aziridinyl, dihydropyrrolyl, tetrahydropyrrolyl, piperidinyl, oxazolidinyl, morpholinyl, piperazinyl, oxepinyl, thiepinyl, azepine and tetrahydrothioxolyl. Additionally, the heterocyclyl group may be optionally substituted.

[0078] Heteroaryl - As used herein, non-fused and fused heteroaromatic groups may contain 1 to 5 heteroatoms, wherein at least one heteroatom is selected from the group consisting of nitrogen, oxygen, sulfur, selenium, silicon, phosphorus, germanium and boron atoms. Heteroaryl also refers to heteroaryl. The heteroaryl may be a heteroaryl having 3 to 30 carbon atoms, preferably a heteroaryl having 3 to 20 carbon atoms, and more preferably a heteroaryl having 3 to 12 carbon atoms. Suitable heteroaryl groups include dibenzothiophene, dibenzofuran, dibenzoselenophene, furan, thiophene, benzofuran, benzothiophene, benzoselenophene, carbazole, indole, carbazole, pyridine, indole, pyrrolopyridine, pyrazole, imidazole, triazole, oxazole, thiazole, oxadiazole, oxatriazole, dioxazole, thiadiazole, pyridine, pyridazine, pyrimidine, pyrazine, triazine, oxazine, oxathiazine, oxadiazine, indole, benzimidazole, indazole, indenozine, benzoxazole, benzisoxazole, benzothiazole, quinoline, isoquinoline, In some embodiments, the heteroaryl group is an aryl group, wherein ...

[0079] Alkoxy-as used herein, represented by -O-alkyl, -O-cycloalkyl, -O-heteroalkyl or -O-heterocyclyl. Examples and preferred examples of alkyl, cycloalkyl, heteroalkyl and heterocyclyl are the same as described above. Alkoxy can be an alkoxy having 1 to 20 carbon atoms, preferably an alkoxy having 1 to 6 carbon atoms. Examples of alkoxy include methoxy, ethoxy, propoxy, butoxy, pentyloxy, hexyloxy, cyclopropyloxy, cyclobutyloxy, cyclopentyloxy, cyclohexyloxy, tetrahydrofuranyloxy, tetrahydropyranyloxy, methoxypropyloxy, ethoxyethyloxy, methoxymethyloxy and ethoxymethyloxy. In addition, alkoxy can be optionally substituted.

[0080] Aryloxy - as used herein, represented by -O-aryl or -O-heteroaryl. Examples and preferred examples of aryl and heteroaryl are the same as above. Aryloxy can be an aryloxy having 6 to 30 carbon atoms, preferably an aryloxy having 6 to 20 carbon atoms. Examples of aryloxy include phenoxy and biphenyloxy. In addition, aryloxy can be optionally substituted.

[0081] Aralkyl - as used herein, encompasses aryl-substituted alkyl groups. Aralkyl groups may be aralkyl groups having 7 to 30 carbon atoms, preferably aralkyl groups having 7 to 20 carbon atoms, and more preferably aralkyl groups having 7 to 13 carbon atoms. Examples of aralkyl groups include benzyl, 1-phenylethyl, 2-phenylethyl, 1-phenylisopropyl, 2-phenylisopropyl, phenyl tert-butyl, α-naphthylmethyl, 1-α-naphthyl-ethyl, 2-α-naphthylethyl, 1-α-naphthylisopropyl, 2-α-naphthylisopropyl, β-naphthylmethyl, 1-β-naphthyl-ethyl, 2-β-naphthyl-ethyl, 1-β-naphthylisopropyl, 2-β-naphthylisopropyl, p-methylbenzyl, m-methylbenzyl, substituted alkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl,

[0082] Alkylsilyl - As used herein, alkyl substituted silicon groups are contemplated. The alkylsilyl group may be an alkylsilyl group having 3-20 carbon atoms, preferably an alkylsilyl group having 3 to 10 carbon atoms. Examples of alkylsilyl groups include trimethylsilyl, triethylsilyl, methyldiethylsilyl, ethyldimethylsilyl, tripropylsilyl, tributylsilyl, triisopropylsilyl, methyldiisopropylsilyl, dimethylisopropylsilyl, tri-tert-butylsilyl, triisobutylsilyl, dimethyltert-butylsilyl, methyldi-tert-butylsilyl. In addition, the alkylsilyl group may be optionally substituted.

[0083] Arylsilyl - as used herein, encompasses at least one aryl-substituted silicon group. The arylsilyl group may be an arylsilyl group having 6 to 30 carbon atoms, preferably an arylsilyl group having 8 to 20 carbon atoms. Examples of arylsilyl groups include triphenylsilyl, phenyldiphenylsilyl, diphenylbiphenylsilyl, phenyldiethylsilyl, diphenylethylsilyl, phenyldimethylsilyl, diphenylmethylsilyl, phenyldiisopropylsilyl, diphenylisopropylsilyl, diphenylbutylsilyl, diphenylisobutylsilyl, diphenyltert-butylsilyl. In addition, the arylsilyl group may be optionally substituted.

[0084] The term "aza" in azadibenzofuran, azadibenzothiophene, etc. means that one or more CH groups in the corresponding aromatic fragment are replaced by a nitrogen atom. For example, azatriphenylene includes dibenzo[f,h]quinoxaline, dibenzo[f,h]quinoline and other analogs having two or more nitrogens in the ring system. Other nitrogen analogs of the above-mentioned aza derivatives can be easily thought of by those of ordinary skill in the art, and all such analogs are determined to be included in the terms described herein.

[0085] In the present 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 carboxyl, substituted ester, substituted sulfinyl, substituted sulfonyl, substituted phosphino, means that any one of alkyl, cycloalkyl, heteroalkyl, heterocyclyl, aralkyl, alkoxy, aryloxy, alkenyl, alkynyl, aryl, heteroaryl, alkylsilyl, arylsilyl, amino, acyl, carbonyl, carboxyl, ester, sulfinyl, sulfonyl and phosphino may be substituted by one or more selected from deuterium, halogen, unsubstituted alkyl groups having 1 to 20 carbon atoms. The invention also includes an alkyl group, an unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, an unsubstituted heteroalkyl group having 1 to 20 carbon atoms, an unsubstituted heterocyclyl group having 3 to 20 ring atoms, an unsubstituted aralkyl group having 7 to 30 carbon atoms, an unsubstituted alkoxy group having 1 to 20 carbon atoms, an unsubstituted aryloxy group having 6 to 30 carbon atoms, an unsubstituted alkenyl group having 2 to 20 carbon atoms, an unsubstituted alkynyl group having 2 to 20 carbon atoms, an unsubstituted aryl group having 6 to 30 carbon atoms, an unsubstituted heteroaryl group having 3 to 30 carbon atoms, an unsubstituted alkylsilyl group having 3 to 20 carbon atoms, an unsubstituted arylsilyl group having 6 to 20 carbon atoms, an 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 mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof.

[0086] It should be understood that when describing a molecular fragment as a substituent or otherwise attached to another moiety, its name can be written according to whether it is a fragment (e.g., phenyl, phenylene, naphthyl, dibenzofuranyl) or according to whether it is a whole molecule (e.g., benzene, naphthalene, dibenzofuran). As used herein, these different ways of specifying a substituent or attaching a fragment are considered equivalent.

[0087] In the compounds mentioned in this disclosure, hydrogen atoms may be partially or completely replaced by deuterium. Other atoms such as carbon and nitrogen may also be replaced by their other stable isotopes. The replacement of other stable isotopes in the compounds may be preferred because it enhances the efficiency and stability of the device.

[0088] In the compounds mentioned in the present disclosure, polysubstitution refers to the range including disubstitution up to the maximum number of available substitutions. When a substituent in the compounds mentioned in the present disclosure represents polysubstitution (including disubstitution, trisubstitution, tetrasubstitution, etc.), it means that the substituent can exist in multiple available substitution positions on its connection structure, and the substituent existing in multiple available substitution positions can be the same structure or different structures.

[0089] In the compounds mentioned in the present disclosure, unless explicitly defined, for example, adjacent substituents can be optionally connected to form a ring, otherwise adjacent substituents in the compound cannot be connected to form a ring. In the compounds mentioned in the present disclosure, adjacent substituents can be optionally connected to form a ring, including both the situation where adjacent substituents can be connected to form a ring and the situation where adjacent substituents are not connected to form a ring. When adjacent substituents can be optionally connected to form a ring, the formed ring can be a monocyclic or polycyclic ring, as well as an alicyclic, heteroalicyclic, aromatic or heteroaromatic ring. In this statement, adjacent substituents can refer to substituents bonded to the same atom, substituents bonded to carbon atoms directly bonded to each other, or substituents bonded to carbon atoms further away. Preferably, adjacent substituents refer to substituents bonded to the same carbon atom and substituents bonded to carbon atoms directly bonded to each other.

[0090] The expression that adjacent substituents can be optionally linked to form a ring is also intended to be taken 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:

[0091]

[0092] The expression that adjacent substituents can be optionally linked to form a ring is also intended to be taken 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:

[0093]

[0094] Furthermore, the statement that adjacent substituents can be optionally linked to form a ring is also intended to be taken to mean that, in the case where one of the two substituents bonded to the carbon atoms directly bonded to each other represents hydrogen, the second substituent is bonded at the position to which the hydrogen atom is bonded, thereby forming a ring. This is exemplified by the following formula:

[0095]

[0096] According to one embodiment of the present invention, an electroluminescent device is disclosed, comprising:

[0097] anode,

[0098] cathode,

[0099] 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;

[0100] The first compound has a structure of HLE, wherein H has a structure represented by Formula A:

[0101]

[0102] In formula A,

[0103] Each time Z1-Z3, Z6-Z8 appears, they are selected from CR z1 or N, Z4 and Z5 are selected from CR each time they appear, either identically or differently z2 , and the two substituents R in Z4 and Z5 z2 Connect to form a ring;

[0104] 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;

[0105] E 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;

[0106] R z1 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 6 to 30 carbon atoms Aryloxy, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0107] R z2 Each occurrence is identically or differently selected from the group consisting of: hydrogen, 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 cycloalkyl having 6 to 30 carbon atoms substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0108] Adjacent substituent R z1 , R z2 Can be connected arbitrarily to form a ring;

[0109] The second compound is a metal complex, wherein the metal is selected from metals with a relative atomic mass greater than 40, and the metal complex comprises a ligand L a , the L a Having a structure represented by Formula C:

[0110]

[0111] In formula C, ring A and ring B are each independently selected from a five-membered unsaturated carbocyclic ring, an aromatic ring having 6 to 30 carbon atoms, or a heteroaromatic ring having 3 to 30 carbon atoms;

[0112] R i Each occurrence of R is the same or different, indicating mono-, poly- or unsubstituted; ii Each occurrence of the same or different means mono-, poly- or no-substitution;

[0113] Y is selected from SiR y R y ,GeR y R y , NR y , P.R. y , O, S or Se;

[0114] When there are two R y When two R y Can be the same or different;

[0115] X1-X2 are selected from CR in the same or different ways each time they appear x or N;

[0116] R, R i , R ii , R x and R y Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 6 to 30 carbon atoms Aryloxy, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0117] Adjacent substituent R i , R x , R y , R and R ii Can optionally be linked to form a ring.

[0118] In this embodiment, the adjacent substituent R z1 , R z2 can be optionally connected to form a ring, which is intended to represent adjacent groups of substituents, for example, adjacent substituents R in Z1-Z3 z1 Between, adjacent substituents R in Z6-Z8 z1 The substituent R in Z3 z1 With the substituent R in Z4 z2 The substituent R in Z3 z1 With the substituent R in Z5 z2 The substituent R in Z6 z1 With the substituent R in Z4 z2 between, and the substituent R in Z6 z1 With the substituent R in Z5 z2 Any one or more of these substituent groups can be connected to form a ring. Obviously, these adjacent substituent groups can also not be connected to form a ring.

[0119] In this context, adjacent substituents R i , R x , R y , R and R ii can be optionally linked to form a ring, which is intended to represent adjacent substituent groups, for example, two substituents R i Between the two substituents R ii Between the two substituents R y Between the two substituents R x Between, the substituent R i With R x Between the substituents R and R y Between, and the substituent R ii Any one or more of these substituent groups may be connected to form a ring between R. Obviously, none of these substituents may be connected to form a ring.

[0120] According to one embodiment of the present invention, in Formula A, the two substituents R in Z4 and Z5 are z2 The rings are connected to form a ring having at least 6 ring atoms.

[0121] According to one embodiment of the present invention, in Formula A, the two substituents R in Z4 and Z5 are z2 The rings are connected to form a ring having at least 7 ring atoms.

[0122] According to one embodiment of the present invention, in the first compound, H has a structure represented by any one of Formula A-1 to Formula A-8:

[0123]

[0124] In Formula A-1 to Formula A-8,

[0125] Each time Z1-Z3, Z6-Z8 appears, they are selected from CR z1 or N;

[0126] Z h1 -Z h8 Each occurrence is the same or different selection from CR zh or N;

[0127] Z m Selected from CR zm or N;

[0128] Z n Selected from CR zn R zn , O, S or NR zn ; When Z n Selected from CR zn Rzn When two R zn Can be the same or different;

[0129] R z1 , R zh , R zm , R zn each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 6 to 30 carbon atoms Aryloxy, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0130] Adjacent substituent R z1 , R zh , R zm , R zn Can optionally be linked to form a ring.

[0131] In this context, adjacent substituents R z1 , R zh , R zm , R zn can be optionally connected to form a ring, which is intended to represent adjacent groups of substituents, for example, adjacent substituents R in Z1-Z3 z1 Between, adjacent substituents R in Z6-Z8 z1 Between adjacent substituents R zh Between adjacent substituents R zh and R zm Between adjacent substituents R zn Between, and adjacent substituents R zh and R zn Any one or more of these substituent groups can be connected to form a ring. Obviously, these adjacent substituent groups can also not be connected to form a ring.

[0132] According to one embodiment of the present invention, in Formula A-1 to Formula A-8, R z1, R zh , R zm , R zn each occurrence being identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, cyano, isocyano, hydroxyl, mercapto, and combinations thereof;

[0133] Adjacent substituent R z1 , R zh , R zm , R zn Can optionally be linked to form a ring.

[0134] According to one embodiment of the present invention, in the first compound, H has a structure represented by any one of Formula A-1 to Formula A-8:

[0135]

[0136] In Formula A-1 to Formula A-8,

[0137] Each time Z1-Z3, Z6-Z8 appears, they are selected from CR z1 ;

[0138] Z h1 -Z h8 Each occurrence is selected from CR zh or N;

[0139] Z m Selected from N;

[0140] Z n Select from O, S or NR zn ;

[0141] R z1 , R zh , R zneach occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 6 to 30 carbon atoms Aryloxy, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0142] Adjacent substituent R z1 , R zh , R zn Can optionally be linked to form a ring.

[0143] In this context, adjacent substituents R z1 , R zh , R zn can be optionally connected to form a ring, which is intended to represent adjacent groups of substituents, for example, adjacent substituents R in Z1-Z3 z1 Between, adjacent substituents R in Z6-Z8 z1 Between adjacent substituents R zh Between adjacent substituents R zn Between, and adjacent substituents R zh and R zn Any one or more of these substituent groups can be connected to form a ring. Obviously, these adjacent substituent groups can also not be connected to form a ring.

[0144] According to one embodiment of the present invention, in the first compound, H has a structure represented by any one of Formula A-1 to Formula A-8:

[0145]

[0146] In Formula A-1 to Formula A-8,

[0147] Each time Z1-Z3, Z6-Z8 appears, they are selected from CR z1 ;

[0148] Z h1-Z h8 Each occurrence is the same or different selection from CR zh or N;

[0149] Z m Selected from N;

[0150] Z n Select from O, S or NR zn ;

[0151] R z1 , R zh , R zn each occurrence being identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, cyano, isocyano, hydroxyl, mercapto, and combinations thereof;

[0152] Adjacent substituent R z1 , R zh , R zn Can optionally be linked to form a ring.

[0153] According to one embodiment of the present invention, in the first compound, H is selected from the group consisting of the following structures:

[0154]

[0155]

[0156]

[0157]

[0158] In this embodiment, "*" indicates the position of the H structure connected to the L.

[0159] According to one embodiment of the present invention, the hydrogen in the structures of H-1 to H-76 can be partially or completely replaced by deuterium.

[0160] According to one embodiment of the present invention, in the first compound, E has a structure represented by Formula Ea or Formula Eb:

[0161]

[0162] In Formula Ea and Formula Eb,

[0163] E1-E 14 Each time it appears, it is selected from C, CR e or N;

[0164] R e Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 6 to 30 carbon atoms Aryloxy, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0165] Adjacent substituent R e Can optionally be linked to form a ring.

[0166] In this embodiment, It indicates the position of the structure of the E linked to the L.

[0167] In this embodiment, in Formula Ea, one of E1-E6 is C, and the C is connected to the L; in Formula Eb, E7-E 14 One of the L is C, and the C is connected to the L.

[0168] In this embodiment, the adjacent substituent R e can be optionally connected to form a ring, which is intended to indicate that any adjacent substituents R e Obviously, any adjacent substituents R e They can also not be connected to form a ring.

[0169] According to one embodiment of the present invention, in the formula Ea, at least two of E1-E6 are N; in the formula Eb, E7-E 14 At least 2 of them are N.

[0170] According to one embodiment of the present invention, in the formula Ea, three of E1-E6 are N; in the formula Eb, E7-E 10 Two of them are N.

[0171] According to one embodiment of the present invention, in the first compound, E has a structure represented by any one of Formula E-1 to Formula E-10:

[0172]

[0173] R A Each occurrence is identical or different and indicates mono-, poly-, or unsubstituted;

[0174] V is selected from O, S or Se;

[0175] R A Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 6 to 30 carbon atoms Aryloxy, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0176] Adjacent substituent R A Can optionally be linked to form a ring.

[0177] In this context, adjacent substituents R A can be optionally connected to form a ring, which is intended to indicate that any adjacent substituents R A Obviously, any adjacent substituents R A They can also not be connected to form a ring.

[0178] In this embodiment, It indicates the position of the structure of the E linked to the L.

[0179] According to one embodiment of the present invention, in the first compound, E has a structure represented by any one of Formula E-11 to Formula E-21:

[0180]

[0181]

[0182] R A Each occurrence is identical or different and indicates mono-, poly-, or unsubstituted;

[0183] V is selected from O, S or Se;

[0184] R A each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclyl having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, and combinations thereof;

[0185] Adjacent substituent R A Can optionally be linked to form a ring.

[0186] In this embodiment, It indicates the position of the structure of the E linked to the L.

[0187] According to one embodiment of the present invention, in Formula E-1 to Formula E-21, the R A Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, and combinations thereof;

[0188] Adjacent substituent R A Can optionally be linked to form a ring.

[0189] According to one embodiment of the present invention, in Formula E-1 to Formula E-21, the RA each occurrence being identically or differently selected from the group consisting of hydrogen, deuterium, fluorine, cyano, hydroxyl, mercapto, methyl, trideuterated methyl, vinyl, phenyl, biphenyl, naphthyl, 4-cyanophenyl, dibenzofuranyl, dibenzothiophenyl, triphenylene, carbazolyl, 9-phenylcarbazolyl, 9,9-dimethylfluorenyl, pyridyl, phenylpyridyl, and combinations thereof;

[0190] Adjacent substituent R A Can optionally be linked to form a ring.

[0191] According to one embodiment of the present invention, in Formula E-1 to Formula E-21, there is at least one R A , and the R A Each occurrence is identically or differently selected from the group consisting of: deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, and combinations thereof;

[0192] Adjacent substituent R A Can optionally be linked to form a ring.

[0193] According to one embodiment of the present invention, in Formula E-1 to Formula E-21, there is at least one R A , and the R A Each occurrence is identically or differently selected from the group consisting of deuterium, halogen, cyano, substituted or unsubstituted alkyl having 1 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;

[0194] Adjacent substituent R A Can optionally be linked to form a ring.

[0195] According to one embodiment of the present invention, in Formula E-1 to Formula E-21, there is at least one R A , and the R A Each occurrence is identically or differently selected from the group consisting of: deuterium, fluorine, cyano, methyl, trideuterated methyl, phenyl, biphenyl, naphthyl, 4-cyanophenyl, dibenzofuranyl, dibenzothienyl, triphenylene, carbazolyl, 9-phenylcarbazolyl, 9,9-dimethylfluorenyl, pyridyl, phenylpyridyl, and combinations thereof;

[0196] Adjacent substituent R A Can optionally be linked to form a ring.

[0197] According to one embodiment of the present invention, in the first compound, E is selected from the group consisting of the following structures:

[0198]

[0199]

[0200] It indicates the position of the structure of the E linked to the L.

[0201] According to one embodiment of the present invention, L is selected from the group consisting of: a single bond, a phenylene group, a naphthylene group, a biphenylene group, a terphenylene group, a triphenylene group, a pyridylene group, a dibenzothienylene group, a dibenzofuranylene group and a thienylene group.

[0202] According to one embodiment of the present invention, wherein said L is selected from the group consisting of the following structures:

[0203]

[0204] "*" indicates the position in the structure of L that is connected to H, It indicates the position of the structure of the L linked to the E.

[0205] According to one embodiment of the present invention, the hydrogen in the structures of L-1 to L-22 can be partially or completely replaced by deuterium.

[0206] According to one embodiment of the present invention, the first compound has a structure of HLE, wherein the H is selected from any one of the group consisting of H-1 to H-76, the L is selected from any one of the group consisting of L-0 to L-22, and the E is selected from any one of the group consisting of E-1 to E-38. Optionally, hydrogen in the structure of the first compound can be partially or completely replaced by deuterium.

[0207] According to one embodiment of the present invention, the first compound is selected from the group consisting of compound 1-1 to compound 1-249:

[0208]

[0209]

[0210]

[0211]

[0212]

[0213]

[0214]

[0215]

[0216]

[0217]

[0218]

[0219]

[0220]

[0221]

[0222]

[0223] According to one embodiment of the present invention, the hydrogen in the compounds 1-1 to 1-249 can be partially or completely replaced by deuterium.

[0224] According to one embodiment of the present invention, in the second compound, in the formula C, ring A and / or ring B are each independently selected from a five-membered unsaturated carbocyclic ring, an aromatic ring having 6-18 carbon atoms, or a heteroaromatic ring having 3-18 carbon atoms.

[0225] According to one embodiment of the present invention, in the second compound, in the formula C, ring A and / or ring B are each independently selected from a five-membered unsaturated carbocyclic ring, an aromatic ring having 6-10 carbon atoms, or a heteroaromatic ring having 3-10 carbon atoms.

[0226] According to one embodiment of the present invention, in the second compound, the L a A structure selected from any one of Formula 2-1 to Formula 2-19:

[0227]

[0228] in,

[0229] In Formula 2-1 to Formula 2-19, X1-X2 are selected from CR x or N; X3-X7 are selected from CR in the same or different manner each time they appear i or N; A1-A6 are selected from CR in the same or different manner each time they appear ii or N;

[0230] Each occurrence of Z is selected from CR iii Riii ,SiR iii R iii , P.R. iii , O, S or NR iii ; When there are two R iii When two R iii Same or different;

[0231] Y is selected from SiR y R y , NR y , P.R. y , O, S or Se; when there are two R y When two R y Same or different;

[0232] R, R x , R y , R i , R ii and R iii Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 6 to 30 carbon atoms Aryloxy, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0233] Adjacent substituents R, R x , R y , R i , R ii and R iii Can optionally be linked to form a ring.

[0234] In this context, adjacent substituents R, R x , R y , R i , R ii and R iii can be optionally linked to form a ring, which is intended to represent adjacent substituent groups, for example, two substituents R iBetween the two substituents R ii Between the two substituents R x Between the two substituents R y Between the two substituents R iii Between, the substituent R i With R x Between, the substituent R ii With R iii Between the substituents R and R y Between, the substituent R y With R iii Between, the substituent R x With R iii between the substituents R and R iii Any one or more of these substituent groups may be connected to form a ring. Obviously, none of these substituent groups may be connected to form a ring.

[0235] According to one embodiment of the present invention, L a A structure selected from any one of Formula 2-1, Formula 2-5, Formula 2-8, Formula 2-10, Formula 2-11 or Formula 2-12;

[0236] According to one embodiment of the present invention, L a Select the structure represented by formula 2-1.

[0237] According to one embodiment of the present invention, in Formula 2-1 to Formula 2-19, X1-X n and / or A1-A m At least one of the X is selected from N, n Corresponding to the largest sequence number of X1-X7 in any one of Formula 2-1 to Formula 2-19, the A m The corresponding A1-A6 in any of the equations 2-1 to 2-19 has the largest sequence number. For example, for equation 2-1, the X n Corresponding to the largest number X5 among X1-X7 in Formula 2-1, A m The largest number A4 of A1-A6 in Formula 2-1 corresponds to A4, that is, in Formula 2-1, at least one of X1-X5 and / or A1-A4 is selected from N. For another example, for Formula 2-12, X n Corresponding to the largest number X3 of X1-X7 in formula 2-12, the A m Corresponding to A1-A6 in Formula 2-12, the largest serial number A4 exists, that is, at least one of X1-X3 and / or A1-A4 in Formula 2-12 is selected from N.

[0238] According to one embodiment of the present invention, in Formula 2-1 to Formula 2-19, X1-X n At least one of the X is selected from N, n The corresponding X1-X7 has the largest serial number in any one of Formulas 2-1 to 2-19.

[0239] According to one embodiment of the present invention, in Formula 2-1 to Formula 2-19, X2 is N.

[0240] According to one embodiment of the present invention, in Formula 2-1 to Formula 2-19, X1-X2 are each independently selected from CR x ; X3-X7 are each independently selected from CR i ; A1-A6 are each independently selected from CR ii ; Adjacent substituent R x , R i , R ii Can optionally be linked to form a ring.

[0241] In this embodiment, the adjacent substituent R x , R i , R ii can be optionally linked to form a ring, which is intended to represent adjacent substituent groups, for example, two substituents R i Between the two substituents R ii Between the two substituents R x Between, and the substituent R i With R x Any one or more of these substituent groups may be connected to form a ring. Obviously, none of these substituent groups may be connected to form a ring.

[0242] According to one embodiment of the present invention, the R x , R i , R ii Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, cyano, and combinations thereof.

[0243] According to one embodiment of the present invention, the R x , R i , R iiAt least two or three of the following are selected, at each occurrence, identically or differently, from the group consisting of deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, cyano, and combinations thereof.

[0244] In this embodiment, the R x , R i , R ii At least two or three of them are selected from the group of substituents, the same or different, each time they appear, to indicate that in the case of two R x Substituents, all R i Substituents and all R ii In the group of substituents, at least two or three substituents are selected from the group of substituents, the same or different, on each occurrence.

[0245] According to one embodiment of the present invention, in Formula 2-1 to Formula 2-11, X4 and / or X5 are selected from CR i In formula 2-12 to formula 2-19, X3 is selected from CR i ;

[0246] And the R i Each occurrence is identically or differently selected from hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, or a combination thereof.

[0247] According to one embodiment of the present invention, in Formula 2-1 to Formula 2-11, X4 and / or X5 are selected from CR i In formula 2-12 to formula 2-19, X3 is selected from CR i ; and said R i Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, fluorine, methyl, ethyl, isopropyl, isobutyl, tert-butyl, neopentyl, cyclopentyl, cyclopentylmethyl, cyclohexyl, norbornyl, adamantyl, trimethylsilyl, isopropyldimethylsilyl, phenyldimethylsilyl, trifluoromethyl, cyano, and combinations thereof.

[0248] According to one embodiment of the present invention, wherein, in Formula 2-1 to Formula 2-19, R is selected from hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, or a combination thereof.

[0249] According to one embodiment of the present invention, in Formula 2-1 to Formula 2-19, R is selected from hydrogen, deuterium, fluorine, methyl, ethyl, isopropyl, isobutyl, tert-butyl, cyclopentyl, cyclopentylmethyl, cyclohexyl, neopentyl, deuterated methyl, deuterated ethyl, deuterated isopropyl, deuterated isobutyl, deuterated tert-butyl, deuterated cyclopentyl, deuterated cyclopentylmethyl, deuterated cyclohexyl, deuterated neopentyl, trimethylsilyl, or a combination thereof.

[0250] According to one embodiment of the present invention, in Formula 2-1 to Formula 2-19, Y is selected from O or S.

[0251] According to one embodiment of the present invention, in Formula 2-1 to Formula 2-19, Y is O.

[0252] According to one embodiment of the present invention, in Formula 2-1 to Formula 2-19, X1 and X2 are each independently selected from CR x .

[0253] According to one embodiment of the present invention, in Formula 2-1 to Formula 2-19, X1 and X2 are each independently selected from CR x ; said R x Each occurrence is identically or differently selected from hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, or a combination thereof.

[0254] According to one embodiment of the present invention, in Formula 2-1 to Formula 2-19, X1 is selected from CR x , X2 is N.

[0255] According to one embodiment of the present invention, in Formula 2-1 to Formula 2-19, X1 is selected from CR x , X2 is N; said R xis selected from hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, or a combination thereof.

[0256] According to one embodiment of the present invention, in the second compound, the ligand L a Having a structure represented by Formula 2-20 or Formula 2-21:

[0257]

[0258] Among them, in formula 2-20 and formula 2-21,

[0259] Y is selected from O or S;

[0260] R x1 , R x2 , R i1 , R i2 , R i3 , R ii1 , R ii2 , R ii3 , R ii4 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, and combinations thereof.

[0261] R is selected, at each occurrence, identically or differently, from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, and combinations thereof.

[0262] According to one embodiment of the present invention, the ligand L a Having a structure represented by Formula 2-20 or Formula 2-21:

[0263]

[0264] Among them, in formula 2-20 and formula 2-21,

[0265] Y is selected from O or S;

[0266] R x1 , R x2 , R i1 , R i2 , R i3 Neutralize and / or R ii1 , R ii2 , R ii3 , R ii4 At least one or two of them are selected, at each occurrence, identically or differently, 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 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, or a combination thereof; R is selected from halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, or a combination thereof.

[0267] According to one embodiment of the present invention, the ligand L a Having a structure represented by Formula 2-20 or Formula 2-21:

[0268]

[0269] Among them, in formula 2-20 and formula 2-21,

[0270] Y is selected from O or S;

[0271] R x1 , R x2 , R i1 , R i2 , R i3 Neutralize and / or R ii1 , R ii2 , R ii3 , R ii4At least one or two of them are selected, at each occurrence, the same or different, from substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted 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, or a combination thereof; R is selected from substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted 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, or a combination thereof.

[0272] According to one embodiment of the present invention, the ligand L a Having a structure represented by Formula 2-20 or Formula 2-21:

[0273]

[0274] Among them, in formula 2-20 and formula 2-21,

[0275] Y is selected from O or S;

[0276] R i2 Selected from the group consisting of deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, or a combination thereof;

[0277] R is selected from halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, or a combination thereof; R ii1 , R ii2 , R ii3 , R ii4At least one or two of them are selected, at each occurrence, identically or differently, 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 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, or a combination thereof.

[0278] According to one embodiment of the present invention, the ligand L a Having a structure represented by Formula 2-20 or Formula 2-21:

[0279]

[0280] Among them, in formula 2-20 and formula 2-21,

[0281] Y is selected from O or S;

[0282] R i2 Selected from the group consisting of: a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, 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, or a combination thereof;

[0283] R is selected from substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted 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, or a combination thereof; R ii1 , R ii2 , R ii3 , R ii4 At least one or two of the above are selected, at each occurrence, identically or differently, from a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, 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, or a combination thereof.

[0284] According to one embodiment of the present invention, in Formula 2-20 and Formula 2-21, R x1, R x2 , R i1 , R i2 , R i3 , R ii1 , R ii2 , R ii3 , R ii4 , at least one of R is selected, at each occurrence, identically or differently, from the group consisting of: substituted or unsubstituted alkyl having 3-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, and combinations thereof.

[0285] In this embodiment, R x1 , R x2 , R i1 , R i2 , R i3 , R ii1 , R ii2 , R ii3 , R ii4 , at least one of R is selected from the group of substituents the same or different each time it occurs, and is intended to represent: R x1 , R x2 At least one of each occurrence is selected from the group of substituents identically or differently, and / or R i1 , R i2 , R i3 At least one of each occurrence is selected from the group of substituents identically or differently, and / or R ii1 , R ii2 , R ii3 , R ii4 At least one of each occurrence is selected identically or differently from said substituent group, and / or R is selected from said substituent group.

[0286] According to one embodiment of the present invention, in Formula 2-20 and Formula 2-21, R i2 , R i3 , R ii1 , R ii2 , R ii3 , at least one of R is selected, at each occurrence, identically or differently, from the group consisting of: substituted or unsubstituted alkyl having 3-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, and combinations thereof.

[0287] In this embodiment, R i2 , R i3 , R ii1 , R ii2 , R ii3, at least one of R is selected from the group of substituents the same or different each time it occurs, and is intended to represent: R i2 , R i3 At least one of each occurrence is selected from the group of substituents identically or differently, and / or R ii1 , R ii2 , R ii3 At least one of each occurrence is selected identically or differently from said substituent group, and / or R is selected from said substituent group.

[0288] According to one embodiment of the present invention, in Formula 2-20 and Formula 2-21, R x1 , R x2 , R i1 , R i2 , R i3 , R ii1 , R ii2 , R ii3 , R ii4 , at least one of R is selected, at each occurrence, identically or differently, from the group consisting of substituted or unsubstituted alkyl having 3 to 10 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 10 ring carbon atoms, and combinations thereof.

[0289] In this embodiment, R x1 , R x2 , R i1 , R i2 , R i3 , R ii1 , R ii2 , R ii3 , R ii4 , at least one of R is selected from the group of substituents the same or different each time it occurs, and is intended to represent: R x1 , R x2 At least one of each occurrence is selected from the group of substituents identically or differently, and / or R i1 , R i2 , R i3 At least one of each occurrence is selected from the group of substituents identically or differently, and / or R ii1 , R ii2 , R ii3 , R ii4 At least one of each occurrence is selected identically or differently from said substituent group, and / or R is selected from said substituent group.

[0290] According to one embodiment of the present invention, wherein the L a Choose from L a1 To L a188 Groups composed of:

[0291]

[0292]

[0293]

[0294]

[0295]

[0296]

[0297]

[0298] In the above structure, TMS represents trimethylsilyl.

[0299] According to one embodiment of the present invention, wherein the L a1 To L a188 The hydrogen in the structure can be partially or completely replaced by deuterium.

[0300] According to one embodiment of the present invention, the second compound has M(L a ) m (L b ) n (L c ) q structure;

[0301] Wherein, the metal M is selected from metals with a relative atomic mass greater than 40; L a , L b and L c are the first ligand, the second ligand and the third ligand of the complex respectively; m is 1, 2 or 3, n is 0, 1 or 2, q is 0, 1 or 2, m+n+q is equal to the oxidation state of the metal M; when m is greater than 1, multiple L a The same or different; when n is 2, the two L b The same or different, when q is 2, the two L c Same or different;

[0302] L a , L b and L c can optionally be linked to form a multidentate ligand; for example, L a , L b and L c Can be optionally linked to form a tetradentate ligand or a hexadentate ligand; L a , L b and L c It is also possible that none of them are connected so as not to form a multidentate ligand;

[0303] L b and Lc Each occurrence is identically or differently selected from the group consisting of:

[0304]

[0305] Among them, R a , R b and R c Each occurrence is the same or different and indicates mono-, poly-, or unsubstituted;

[0306] X b Each occurrence is identically or differently selected from the group consisting of: O, S, Se, NR N1 and CR C1 R C2 ;

[0307] X c and X d Each occurrence is identically or differently selected from the group consisting of: O, S, Se and NR N2 ;

[0308] R a , R b , R c , R N1 , R N2 , R C1 and R C2 The alkyl radicals are selected, at each occurrence, identically or differently, from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl radicals having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl radicals having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl radicals having 1 to 20 carbon atoms, substituted or unsubstituted aralkyl radicals having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy radicals having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy radicals having 6 to 30 carbon atoms, substituted or unsubstituted 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 amine groups, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof;

[0309] Among them, the adjacent substituent R a , R b , R c , R N1 , R N2 , R C1 and R C2 Can optionally be linked to form a ring.

[0310] In this embodiment, the adjacent substituent R a , R b , R c , R N1 , R N2 , R C1 and R C2 can be optionally linked to form a ring, which is intended to represent adjacent substituent groups, for example, two substituents R a Between the two substituents R b Between the two substituents R c Between, the substituent R a and R b Between, the substituent R a and R c Between, the substituent R b and R c Between, the substituent R a and R N1 Between, the substituent R b and R N1 Between, the substituent R a and R C1 Between, the substituent R a and R C2 Between, the substituent R b and R C1 Between, the substituent R b and R C2 Between, the substituent R a and R N2 Between, the substituent R b and R N2 Between, and R C1 and R C2 Any one or more of these substituent groups may be connected to form a ring. Obviously, none of these substituent groups may be connected to form a ring.

[0311] In this embodiment, L a , L b and L c can be optionally linked to form a multidentate ligand, and is intended to represent L a , L b and L c Any two or three of L can be linked to form a tetradentate ligand or a hexadentate ligand. a , L b and L c It is also possible that none of them are connected so as not to form a multidentate ligand.

[0312] According to one embodiment of the present invention, in the second compound, the metal M is selected from Ir, Rh, Re, Os, Pt, Au or Cu.

[0313] According to one embodiment of the present invention, in the second compound, the metal M is selected from Ir, Pt or Os.

[0314] According to one embodiment of the present invention, in the second compound, the metal M is Ir.

[0315] According to one embodiment of the present invention, in the device, the second compound is an Ir complex having Ir(L a )(L b )(L c )、Ir(L a )2(L b )、Ir(L a )2(L c ) or Ir(L a )(L c )A structure shown in any one of 2.

[0316] According to one embodiment of the present invention, L b Each occurrence is identically or differently selected from the following structures:

[0317]

[0318] wherein R1-R7 are selected, at each occurrence, identically or differently, from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl 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 amine groups, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups having 0 to 20 carbon atoms, and combinations thereof.

[0319] According to one embodiment of the present invention, L b Each occurrence is identically or differently selected from the following structures:

[0320]

[0321] wherein at least one of R1-R3 is selected from substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, or a combination thereof; and / or at least one of R4-R6 is substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, or a combination thereof.

[0322] According to one embodiment of the present invention, L b Each occurrence is identically or differently selected from the following structures:

[0323]

[0324] wherein at least two of R1-R3 are selected from substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, or a combination thereof; and / or at least one of R4-R6 is substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, or a combination thereof.

[0325] According to one embodiment of the present invention, L b Each occurrence is identically or differently selected from the following structures:

[0326]

[0327] wherein at least two of R1-R3 are selected from substituted or unsubstituted alkyl groups having 2-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 2-20 carbon atoms, or a combination thereof; and / or at least two of R4-R6 are selected from substituted or unsubstituted alkyl groups having 2-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 2-20 carbon atoms, or a combination thereof.

[0328] According to one embodiment of the present invention, in the second compound, the L b Each time it appears, choose the same or different one from L b1 To L b322 Groups composed of:

[0329]

[0330]

[0331]

[0332]

[0333]

[0334]

[0335]

[0336]

[0337] According to one embodiment of the present invention, in the second compound, the L c Each time it appears, choose the same or different one from L c1 To L c231 Groups composed of:

[0338]

[0339]

[0340]

[0341]

[0342]

[0343]

[0344] According to one embodiment of the present invention, in the device, the second compound is an Ir complex having a a )(L b )(L c )、Ir(L a )2(L b )、Ir(L a )2(L c ) and Ir(L a )(L c )2; when the second compound has Ir(L a )(L b )(L c ) structure, the L a Choose from L a1 To L a188 Any one of the group consisting of b Choose from L b1 To L b322 Any one of the group consisting ofc Choose from L c1 To L c231 When the second compound has Ir(L a )2(L b ) structure, the L a Choose from L a1 To L a188 Any one or any two of the group consisting of b Choose from L b1 To L b322 When the second compound has Ir(L a )2(L c ) structure, the L a Choose from L a1 To L a188 Any one or any two of the group consisting of c Choose from L c1 To L c231 When the second compound has Ir(L a )(L c )2, the L a Choose from L a1 To L a188 Any one of the group consisting of c Choose from L c1 To L c231 Any one or any two of the group consisting of.

[0345] According to one embodiment of the present invention, the second compound is selected from compound C1 to compound C 173 Groups composed of:

[0346]

[0347]

[0348]

[0349]

[0350]

[0351]

[0352]

[0353]

[0354]

[0355]

[0356]

[0357]

[0358] According to one embodiment of the present invention, the organic layer is a light-emitting layer, the first compound is a host material, and the second compound is a light-emitting material.

[0359] According to an embodiment of the present invention, the device emits red light or white light.

[0360] According to another embodiment of the present invention, a display assembly is disclosed, which includes an electroluminescent device. The specific structure of the electroluminescent device is as shown in any of the above embodiments.

[0361] According to another embodiment of the present invention, there is also disclosed a compound combination, which comprises at least a first compound and a second compound;

[0362] The first compound has a structure of HLE, and the H has a structure represented by formula A:

[0363]

[0364] In formula A,

[0365] Each time Z1-Z3, Z6-Z8 appears, they are selected from CR z1 or N, Z4 and Z5 are selected from CR each time they appear, either identically or differently z2 , and the two substituents R in Z4 and Z5 z2 Connect to form a ring;

[0366] 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;

[0367] E 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;

[0368] R z1Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 6 to 30 carbon atoms Aryloxy, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0369] R z2 Each occurrence is identically or differently selected from the group consisting of: hydrogen, 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 cycloalkyl having 6 to 30 carbon atoms substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0370] Adjacent substituent R z1 , R z2 Can be connected arbitrarily to form a ring;

[0371] The second compound is a metal complex, wherein the metal is selected from metals with a relative atomic mass greater than 40, and the metal complex comprises a ligand L a , the L a Having a structure represented by Formula C:

[0372]

[0373] In formula C, ring A and ring B are each independently selected from a five-membered unsaturated carbocyclic ring, an aromatic ring having 6 to 30 carbon atoms, or a heteroaromatic ring having 3 to 30 carbon atoms;

[0374] R i Each occurrence of R is the same or different, indicating mono-, poly- or unsubstituted; ii Each occurrence of the same or different means mono-, poly- or no-substitution;

[0375] Y is selected from SiR y R y ,GeR y R y , NR y , P.R. y , O, S or Se;

[0376] When there are two R y When two R y Can be the same or different;

[0377] X1-X2 are selected from CR in the same or different ways each time they appear x or N;

[0378] R, R i , R ii , R x and R y Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 6 to 30 carbon atoms Aryloxy, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0379] Adjacent substituent R i , R x , R y , R and R ii Can optionally be linked to form a ring.

[0380] Combination with other materials

[0381] The materials for specific layers in the organic light-emitting device described in the present invention can be used in combination with various other materials present in the device. The combination of these materials is described in detail in paragraphs 0132-0161 of U.S. Patent Application US2016 / 0359122A1, the entire contents of which are incorporated herein by reference. The materials described or mentioned therein are non-limiting examples of materials that can be used in combination with the compounds disclosed herein, and those skilled in the art can easily consult the literature to identify other materials that can be used in combination.

[0382] The materials described herein as specific layers that can be used in an organic light-emitting device can be used in combination with a variety of other materials present in the device. For example, the combination of the first compound and the second compound disclosed herein can be used in combination with a variety of light-emitting dopants, hosts, transport layers, barrier layers, injection layers, electrodes, and other layers that may be present. The combination of these materials is described in detail in paragraphs 0080-0101 of U.S. Patent Application US2015 / 0349273A1, the entire contents of which are incorporated herein by reference. The materials described or mentioned therein are non-limiting examples of materials that can be used in combination with the compounds disclosed herein, and those skilled in the art can easily consult the literature to identify other materials that can be used in combination.

[0383] The first compound and the second compound used in the present invention can be obtained by referring to the preparation method in the prior art, or can also be easily prepared by referring to patent applications such as application numbers US20180337340A1, CN111868210A, CN202010285016.7, CN202010268985.1, CN202010285026.0, CN202010720191.4, CN202010825242.X, CN202011219604.7, CN202110348602.6, etc., which will not be repeated here. The preparation method of the electroluminescent device is not limited, and the preparation method of the following embodiment is only an example and should not be construed as a limitation. Those skilled in the art can make reasonable improvements to the preparation method of the following embodiment based on the prior art. Exemplarily, the ratio of various materials in the light-emitting layer is not particularly limited, and those skilled in the art can reasonably select within a certain range based on the prior art. For example, based on the total weight of the light-emitting layer material, the main material can account for 80%-99%, and the light-emitting material can account for 1%-20%; or the main material can account for 90%-98%, and the light-emitting material can account for 2%-10%. In addition, the main material can be one or two materials, wherein the ratio of the two main materials to the main material can be 100:0 to 1:99; or, the ratio can be 80:20 to 20:80; or, the ratio can be 60:40 to 40:60. In the embodiment of the device, the characteristics of the device are also tested using conventional equipment in the art (including but not limited to the evaporation machine produced by Angstrom Engineering, the optical test system and life test system produced by Suzhou Fushida, the ellipsometer produced by Beijing Liangtuo, etc.), using methods well known to those skilled in the art. Since those skilled in the art are aware of the use of the above-mentioned equipment, the test method and other related contents, and can obtain the inherent data of the sample with certainty and without being affected, the above-mentioned related contents will not be elaborated in this patent.

[0384] Device Example 1

[0385] First, the glass substrate with a 120nm thick indium tin oxide (ITO) anode was cleaned and then treated with oxygen plasma and UV ozone. After treatment, the substrate was dried in a glove box to remove moisture. The substrate was then mounted on a substrate holder and loaded into a vacuum chamber. The organic layers specified below were placed in a vacuum of approximately 10 -8 Compound HI is used as a hole injection layer (HIL) with a thickness of 1000 nm. Compound HT was used as a hole transport layer (HTL) with a thickness of Compound EB is used as electron blocking layer (EBL) with a thickness of Then, compound C8 as a dopant material was co-doped with compound 1-34 as a host material (weight ratio of 2:98) to form an emission layer (EML) with a thickness of Compound HB is used as a hole blocking layer (HBL) with a thickness of On the HBL, compound ET and 8-hydroxyquinoline-lithium (Liq) were co-deposited as an electron transport layer (ETL) with a thickness of Finally, 1 nm thick Liq was deposited as an electron injection layer and 120 nm Al was deposited as a cathode. The device was then transferred back to the glove box and encapsulated with a glass cover and a moisture absorber to complete the device.

[0386] Device Example 2

[0387] The implementation method of Device Example 2 is the same as that of Device Example 1, except that Compound 1-35 is used as the host material instead of Compound 1-34 in the light-emitting layer.

[0388] Device Example 3

[0389] The implementation of device example 3 is the same as that of device example 1, except that compound C is used in the light-emitting layer. 27 Replace compound C8 as a dopant material.

[0390] Device Example 4

[0391] The implementation method of Device Example 4 is the same as that of Device Example 3, except that Compound 1-36 is used as the host material instead of Compound 1-34 in the light-emitting layer.

[0392] Device Example 5

[0393] The implementation method of Device Example 5 is the same as that of Device Example 3, except that Compound 1-35 is used as the host material instead of Compound 1-34 in the light-emitting layer.

[0394] Device Example 6

[0395] The implementation of device example 6 is the same as that of device example 1, except that compound C is used in the light-emitting layer. 56 Compound C8 is replaced as the dopant material, and the doping weight ratio of the dopant material to the host material in the light-emitting layer is adjusted to 3:97.

[0396] Device Example 7

[0397] The implementation of device example 7 is the same as that of device example 6, except that compound C is used in the light-emitting layer. 58 Replace compound C 56 as a dopant material.

[0398] Device Example 8

[0399] The implementation of device example 8 is the same as that of device example 6, except that compound C is used in the light-emitting layer. 87 Replace compound C 56 as a dopant material.

[0400] Device Example 9

[0401] The implementation of device example 9 is the same as that of device example 6, except that compound C is used in the light-emitting layer. 139 Replace compound C 56 as a dopant material.

[0402] Device Example 10

[0403] The implementation of device example 10 is the same as that of device example 6, except that compound C is used in the light-emitting layer. 140 Replace compound C 56 as a dopant material.

[0404] Device Example 11

[0405] The implementation of device example 11 is the same as that of device example 6, except that compound C is used in the light-emitting layer. 141 Replace compound C 56 as a dopant material.

[0406] Device Example 12

[0407] The implementation of device example 12 is the same as that of device example 6, except that compound C is used in the light-emitting layer. 144 Replace compound C 56 as a dopant material.

[0408] Device Example 13

[0409] The implementation of device example 13 is the same as that of device example 6, except that compound C is used in the light-emitting layer. 143 Replace compound C 56 as a dopant material.

[0410] Device Example 14

[0411] The implementation of device example 14 is the same as that of device example 6, except that compound C is used in the light-emitting layer. 146 Replace compound C 56 as a dopant material.

[0412] Device Example 15

[0413] The implementation of device example 15 is the same as that of device example 6, except that compound C is used in the light-emitting layer. 150 Replace compound C56 as a dopant material.

[0414] Device Example 16

[0415] The implementation of device example 16 is the same as that of device example 1, except that compound C is used in the light-emitting layer. 158 Replace compound C8 as a dopant material.

[0416] Device Example 17

[0417] The implementation of device example 17 is the same as that of device example 6, except that compound C is used in the light-emitting layer. 163 Replace compound C 56 as a dopant material.

[0418] Device Example 18

[0419] The implementation of device example 18 is the same as that of device example 6, except that compound C is used in the light-emitting layer. 166 Replace compound C 56 as a dopant material.

[0420] Device Example 19

[0421] The implementation of device example 19 is the same as that of device example 6, except that compound C is used in the light-emitting layer. 167 Replace compound C 56 as a dopant material.

[0422] Device Example 20

[0423] The implementation of device example 20 is the same as that of device example 6, except that compound C is used in the light-emitting layer. 173 Replace compound C 56 as a dopant material.

[0424] Device Comparison Example 1

[0425] The implementation of Device Comparative Example 1 is the same as that of Device Example 1, except that Compound H1 is used instead of Compound 1-34 as a host material in the light-emitting layer, and Compound RD-A is used instead of Compound C8 as a dopant material.

[0426] Device Comparison Example 2

[0427] The implementation method of Comparative Device Example 2 is the same as that of Comparative Device Example 1, except that Compound 1-34 is used as a host material instead of Compound H1 in the light emitting layer.

[0428] Device Comparison Example 3

[0429] The implementation method of Comparative Device Example 3 is the same as that of Comparative Device Example 1, except that Compound 1-36 is used as a host material instead of Compound H1 in the light-emitting layer.

[0430] Device Comparison Example 4

[0431] The implementation method of Comparative Device Example 4 is the same as that of Comparative Device Example 1, except that Compound 1-35 is used as a host material instead of Compound H1 in the light-emitting layer.

[0432] Device Comparison Example 5

[0433] The implementation method of Comparative Device Example 5 is the same as that of Example 1, except that Compound H1 is used as a host material in the light-emitting layer instead of Compound 1-34.

[0434] Device Comparison Example 6

[0435] The implementation of Comparative Device Example 6 is the same as that of Example 3, except that Compound H1 is used as a host material in the light-emitting layer instead of Compound 1-34.

[0436] Device Comparison Example 7

[0437] The implementation of Comparative Device Example 7 is the same as that of Example 6, except that Compound H1 is used as a host material in the light-emitting layer instead of Compound 1-34.

[0438] Device Comparison Example 8

[0439] The implementation method of device comparative example 8 is the same as that of device example 7, except that compound H1 is used as a host material instead of compound 1-34 in the light-emitting layer.

[0440] Device Comparison Example 9

[0441] The implementation of Comparative Device Example 9 is the same as that of Example 8, except that Compound H1 is used as a host material in the light-emitting layer instead of Compound 1-34.

[0442] Device Comparative Example 10

[0443] The implementation of Comparative Device Example 10 is the same as that of Example 9, except that Compound H1 is used as a host material in the light-emitting layer instead of Compound 1-34.

[0444] Device Comparison Example 11

[0445] The implementation of Comparative Device Example 11 is the same as that of Example 10, except that Compound H1 is used as a host material in the light-emitting layer instead of Compound 1-34.

[0446] Device Comparison Example 12

[0447] The implementation of Comparative Device Example 12 is the same as that of Example 11, except that Compound H1 is used as a host material in the light-emitting layer instead of Compound 1-34.

[0448] Device Comparative Example 13

[0449] The implementation of Comparative Device Example 13 is the same as that of Example 12, except that Compound H1 is used as a host material in the light-emitting layer instead of Compound 1-34.

[0450] The device layer structure and thickness are shown in the table below. Where more than one material is used, different compounds are doped in the weight ratios recorded.

[0451] Table 1 Device structures of device embodiments and comparative examples

[0452]

[0453]

[0454]

[0455] The structure of the materials used in the device is shown below:

[0456]

[0457]

[0458] The IVL and lifetime characteristics of the device were measured. Table 2 shows the IVL and lifetime characteristics of the device at 15 mA / cm 2 The external quantum efficiency (EQE) data measured at current density of 5000 cd / m 2 Lifetime (LT97) data measured at initial brightness.

[0459] Table 2 Device data

[0460]

[0461]

[0462] By comparing the data between Examples 1 and 2 and Comparative Example 5, it can be seen that the combination of the first compound and the second compound of the present invention can further improve the EQE of the device from the EQE of 22.45% in Comparative Example 5, which has already reached a very high level, to 24.10% and 24.37%, respectively, with an increase of 7.3% and 8.5%, respectively, which is a very significant increase; more importantly, the compound combination of the present invention greatly extends the life of the device from 702 hours in Comparative Example 5 to 795 hours and 1234 hours, respectively. It proves that the combination of the first compound and the second compound of the present invention has the excellent performance of significantly improving the external quantum efficiency of the device and significantly extending the life of the device. By comparing the data between Examples 3, 4, 5 and Comparative Example 6, it can be seen that the combination of the first compound and the second compound of the present invention can further improve the EQE of the device from the EQE of 22.68% in Comparative Example 6, which has already reached a very high level, to 25.50%, 25.21%, and 25.31%, respectively, with an increase of 12.4%, 9.8%, and 11.6%, respectively, which is a very significant increase; more importantly, the combination of the compounds of the present invention greatly extends the life of Examples 3, 4, and 5 from 665 hours in Comparative Example 6 to 1323 hours, 689 hours, and 942 hours, respectively. It proves that the combination of the first compound and the second compound of the present invention has the excellent performance of significantly improving the external quantum efficiency of the device and significantly extending the life of the device. Similarly, through the data comparison between Example 6 and Comparative Example 7, the comparison between Example 7 and Comparative Example 8, the comparison between Example 8 and Comparative Example 9, the comparison between Example 9 and Comparative Example 10, the comparison between Example 10 and Comparative Example 11, the comparison between Example 11 and Comparative Example 12, and the comparison between Example 12 and Comparative Example 13, it is proved again that the combination of the first compound and the second compound of the present invention can significantly improve the external quantum efficiency of the device and greatly extend the life of the device. At the same time, through the comparison of these nine groups of data, it is also proved that the combination of the first compound and the second compound of the present invention generally has the excellent characteristic of improving device performance.

[0463] These results show that the combination of the first compound and the second compound of the present invention can achieve a significant improvement in device performance, and far exceeds the device effect when using commercial host materials. These results fully demonstrate the superiority of the combination of the first compound and the second compound of the present invention.

[0464] Compared with Examples 1 and 3 and Comparative Example 2, the device performance of the embodiment has obvious advantages: the EQE of Examples 1 and 3 is increased by 332.1% and 352.1% respectively compared with Comparative Example 2, and the life span is also increased by hundreds of times compared with Comparative Example 2, reaching more than 1200 hours, achieving a great improvement. By comparing Examples 13-20 with Comparative Example 2, it can be seen that the device performance of the embodiment has obvious advantages. The device efficiency of Examples 13-20 is generally improved by several times compared with Comparative Example 2, and the device life of Examples 13-20 is generally improved by hundreds of times compared with Comparative Example 2. In particular, Example 20 has an ultra-high device efficiency of 26.10% with a long life of 1603h, indicating that the combination of the first compound and the second compound specifically selected in the present invention can greatly improve the device performance. These results once again prove the superiority of the combination of the first compound and the second compound of the present invention.

[0465] By comparing Comparative Example 1 with Comparative Examples 2-4, it can be found that when the same dopant compound RD-A is used, the device performance of Comparative Examples 2-4 using the first compound selected by the present invention as the main body has been greatly reduced compared with Comparative Example 1 using a commercial main material. According to the comparison of Examples 1-5 with Comparative Examples 5 and 6, it can be found that when the second compound selected by the present invention is used as the dopant material, the device performance of Examples 1-5 is greatly improved compared with the device performance of Comparative Examples 5 and 6 using commercial main materials. Through the above comparison, it can be found that although the compound RD-A and the second compound selected by the present invention are similar in structure, the second compound selected by the present invention, when used in combination with the first compound selected by the present invention, brings unexpected and substantial improvement in device performance. The completely different device performance changes shown when this similar compound structure is combined with different compounds further reflect the unpredictable superiority of the combination of the first compound and the second compound of the present invention.

[0466] In summary, the combination of the first compound and the second compound selected in the present invention can exhibit excellent device performance in the device, can obtain higher external quantum efficiency, and can also greatly improve the device life. This proves that the combination of the first compound and the second compound selected in the present invention has excellent application prospects.

[0467] It should be understood that the various embodiments described herein are only examples and are not intended to limit the scope of the present invention. Therefore, as will be apparent to those skilled in the art, the claimed invention may include variations of the specific embodiments and preferred embodiments described herein. Many of the materials and structures described herein may be replaced with other materials and structures without departing from the spirit of the present invention. It should be understood that the various theories about why the present invention works are not intended to be restrictive.

Claims

1. An electroluminescent device, comprising: anode, cathode, and an organic layer disposed between the anode and the cathode, wherein the organic layer comprises at least a first compound and a second compound; 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; The first compound has a structure of HLE, and the H has a structure represented by formula A: In formula A, Z1-Z3, Z6-Z8 are selected from CR z1 or N, Z4 and Z5 are selected from CR each time they appear, either identically or differently z2 , and the two substituents R in Z4 and Z5 are z2 are connected to form a ring, and the ring has at least 7 ring atoms; 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; E 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; R z1 each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, cyano, isocyano, hydroxyl, mercapto, and combinations thereof; R z2 each occurrence is identically or differently selected from the group consisting of hydrogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, hydroxyl, mercapto, and combinations thereof; Adjacent substituent R z1 , R z2 can optionally be linked to form a ring; The second compound is a metal complex, wherein the second compound has M(L a ) m (L b ) n The general formula is: wherein the metal M is selected from metals with a relative atomic mass greater than 40, and L a , L b are the first and second ligands of the complex, respectively; Where m is 1 or 2, n is 1 or 2, and m+n is equal to the oxidation state of metal M; when m is greater than 1, multiple L a The same or different; when n is 2, the two L b Same or different; L a , L b can optionally be linked to form a multidentate ligand; The L a Having a structure represented by Formula C: In formula C, ring A and ring B are each independently selected from a five-membered unsaturated carbocyclic ring, an aromatic ring having 6 to 30 carbon atoms, or a heteroaromatic ring having 3 to 30 carbon atoms; R i Each occurrence of R is the same or different, indicating mono-, poly- or unsubstituted; ii Each occurrence of the same or different means mono-, poly- or no-substitution; Y is selected from O, S or Se; X1-X2 are selected from CR in the same or different ways each time they appear x or N; R, R i , R ii and R x each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclyl having 3-20 ring atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, cyano, isocyano, and combinations thereof; Adjacent substituent R i , R x , R and R ii can optionally be linked to form a ring; L b Select from the following structures: Among them, R a , R b and R c Each occurrence is identical or different and indicates mono-, poly-, or unsubstituted; X c and X d Select O each time it appears; R a , R b and R c each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, cyano, isocyano, and combinations thereof; Adjacent substituent R a , R b and R c Can optionally be linked to form a ring.

2. The electroluminescent device according to claim 1, wherein In the first compound, H has a structure represented by any one of Formula A-1 to Formula A-8: In Formula A-1 to Formula A-8, Each time Z1-Z3, Z6-Z8 appears, they are selected from CR z1 or N; Z h1 -Z h8 Each occurrence is the same or different selection from CR zh or N; Z m Selected from CR zm or N; Z n Selected from CR zn R zn , O, S or NR zn ; When Z n Selected from CR zn R zn When two R zn Can be the same or different; R z1 , R zh , R zm , R zn each occurrence being identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, cyano, isocyano, hydroxyl, mercapto, and combinations thereof; Adjacent substituent R z1 , R zh , R zm , R zn Can optionally be linked to form a ring.

3. The electroluminescent device according to claim 1 or 2, wherein: The H is selected from Formula A-1 or Formula A-6, wherein R z1 , R zh each occurrence being identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, cyano, isocyano, hydroxyl, mercapto, and combinations thereof; Adjacent substituent R z1 , R zh Can optionally be linked to form a ring.

4. The electroluminescent device of claim 1, wherein the H is selected from the group consisting of: 5 . The electroluminescent device according to claim 4 , wherein hydrogen in the structures H-1 to H-76 can be partially or completely substituted by deuterium.

6. The electroluminescent device according to claim 1, wherein In the first compound, the E has a structure represented by Formula Ea or Formula Eb: In Formula Ea and Formula Eb, E1-E 14 Each time it appears, it is selected from C, CR e or N; R e Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 6 to 30 carbon atoms Aryloxy, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof; Adjacent substituent R e Can optionally be linked to form a ring.

7. The electroluminescent device according to claim 6, wherein in formula Ea, at least two of E1-E6 are N; and in formula Eb, E7-E 14 At least 2 of them are N.

8. The electroluminescent device according to claim 7, wherein in formula Ea, three of E1-E6 are N; and in formula Eb, E7-E 10 2 of them are N.

9. The electroluminescent device according to claim 1, wherein: In the first compound, E has a structure represented by any one of Formula E-1 to Formula E-10: In Formula E-1 to Formula E-10, R A Each occurrence of the same or different means mono-, poly- or no-substitution; V is selected from O, S or Se; R A Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 6 to 30 carbon atoms Aryloxy, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof; Adjacent substituent R A Can optionally be linked to form a ring.

10. The electroluminescent device according to claim 9, wherein E has a structure represented by any one of Formula E-11 to Formula E-21: R A Each occurrence of the same or different means mono-, poly- or no-substitution; V is selected from O, S or Se; R A Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclyl having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, and combinations thereof.

11. The electroluminescent device according to claim 10, wherein: In Formula E-1 to Formula E-21, the R A Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, and combinations thereof; Adjacent substituent R A Can optionally be linked to form a ring.

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

13. The electroluminescent device according to claim 10 or 11, wherein: In Formula E-1 to Formula E-21, there is at least one R A , and the R A Each occurrence is identically or differently selected from the group consisting of: deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, and combinations thereof; Adjacent substituent R A Can optionally be linked to form a ring.

14. The electroluminescent device according to claim 13, wherein the at least one R A Each occurrence is identically or differently selected from the group consisting of deuterium, halogen, cyano, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, and combinations thereof.

15. The electroluminescent device according to claim 14, wherein the at least one R A Each occurrence is identically or differently selected from the group consisting of: deuterium, fluorine, cyano, methyl, trideuterated methyl, phenyl, biphenyl, naphthyl, 4-cyanophenyl, dibenzofuranyl, dibenzothiophenyl, triphenylene, carbazolyl, 9-phenylcarbazolyl, 9,9-dimethylfluorenyl, pyridyl, phenylpyridyl, and combinations thereof.

16. The electroluminescent device according to claim 4, wherein: In the first compound, the E is selected from the group consisting of the following structures: It indicates the position of the structure of the E linked to the L.

17. The electroluminescent device of claim 1, wherein: The L is selected from the group consisting of a single bond, a phenylene group, a naphthylene group, a biphenylene group, a terphenylene group, a triphenylene group, a pyridylene group, a dibenzothienylene group, a dibenzofuranylene group and a thienylene group.

18. The electroluminescent device according to claim 17, wherein the hydrogen in the above-mentioned group can be partially or completely replaced by deuterium.

19. The electroluminescent device of claim 16, wherein L is selected from the group consisting of: "*" indicates the position in the structure of L that is connected to the formula H, It indicates the position of the structure of the L linked to the E.

20. The electroluminescent device according to claim 19, wherein the hydrogen in the structures of L-1 to L-22 can be partially or completely replaced by deuterium.

21. The electroluminescent device of claim 19, wherein: The first compound has a structure of HLE, wherein H is selected from any one of the group consisting of H-1 to H-76, L is selected from any one of the group consisting of L-0 to L-22, and E is selected from any one of the group consisting of E-1 to E-38.

22. The electroluminescent device according to claim 21, wherein hydrogen in the structure of the first compound can be partially or completely replaced by deuterium.

23. The electroluminescent device of claim 22, wherein the first compound is selected from the group consisting of:

24. The electroluminescent device of claim 23, wherein hydrogen in the structure can be partially or completely replaced by deuterium.

25. The electroluminescent device of claim 1, wherein: In the formula C, ring A and / or ring B are each independently selected from a five-membered unsaturated carbon ring, an aromatic ring having 6 to 18 carbon atoms, or a heteroaromatic ring having 3 to 18 carbon atoms.

26. The electroluminescent device according to claim 25, wherein ring A and / or ring B are each independently selected from a five-membered unsaturated carbon ring, an aromatic ring having 6 to 10 carbon atoms, or a heteroaromatic ring having 3 to 10 carbon atoms.

27. The electroluminescent device of claim 1, wherein: In the second compound, the L a Having a structure represented by any one of Formula 2-1 to Formula 2-19: in, In Formulae 2-1 to 2-19, X1-X2 are selected from CR x or N; X3-X7 are selected from CR in the same or different manner each time they appear i or N; A1-A6 are selected from CR in the same or different manner each time they appear ii or N; Each occurrence of Z is selected from CR iii R iii ,SiR iii R iii , P.R. iii , O, S or NR iii ; When there are two R iii When two R iii Same or different; Y is selected from O, S or Se; R, R x , R i , R ii and R iii each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclyl having 3-20 ring atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, cyano, isocyano, and combinations thereof; Adjacent substituents R, R x , R i , R ii and R iii Can optionally be linked to form a ring.

28. The electroluminescent device according to claim 27, wherein L a A structure selected from any one of Formula 2-1, Formula 2-5, Formula 2-8, Formula 2-10, Formula 2-11, and Formula 2-12.

29. The electroluminescent device according to claim 28, wherein L a Select the structure represented by formula 2-1.

30. The electroluminescent device of claim 27, wherein: In equations 2-1 to 2-19, X1-X n and / or A1-A m At least one of the X is selected from N, n Corresponding to the largest sequence number of X1-X7 in any one of Formula 2-1 to Formula 2-19, the A m The corresponding A1-A6 has the largest serial number in any one of Formula 2-1 to Formula 2-19.

31. The electroluminescent device according to claim 30, wherein in Formula 2-1 to Formula 2-19, X1-X n At least one of the X is selected from N, n The corresponding X1-X7 has the largest serial number in any one of Formulas 2-1 to 2-19.

32. The electroluminescent device of claim 31, wherein X2 is N.

33. The electroluminescent device of claim 27, wherein: In Formula 2-1 to Formula 2-19, X1-X2 are each independently selected from CR x ; X3-X7 are each independently selected from CR i ; A1-A6 are each independently selected from CR ii ; Adjacent substituent R x , R i , R ii Can optionally be linked to form a ring.

34. The electroluminescent device according to claim 33, wherein R x , R i , R ii Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, cyano, and combinations thereof.

35. The electroluminescent device according to claim 34, wherein R x , R i , R ii At least two or three of the following are selected, at each occurrence, identically or differently, from the group consisting of deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, cyano, and combinations thereof.

36. The electroluminescent device of claim 1, wherein: In the second compound, the ligand L a Having a structure represented by Formula 2-20 or Formula 2-21: Among them, in formula 2-20 and formula 2-21, Y is selected from O or S; R x1 , R x2 , R i1 , R i2 , R i3 , R ii1 , R ii2 , R ii3 , R ii4 each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, and combinations thereof; R is selected, at each occurrence, identically or differently, from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, and combinations thereof.

37. The electroluminescent device according to claim 36, wherein R x1 , R x2 , R i1 , R i2 , R i3 Neutralize and / or R ii1 , R ii2 , R ii3 , R ii4 At least one or two of them are selected, at each occurrence, identically or differently, 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 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, or a combination thereof; R is selected from halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, or a combination thereof.

38. The electroluminescent device according to claim 37, wherein R x1 , R x2 , R i1 , R i2 , R i3 Neutralize and / or R ii1 , R ii2 , R ii3 , R ii4 At least one or two of them are selected, at each occurrence, the same or different, from substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted 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, or a combination thereof; R is selected from substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted 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, or a combination thereof.

39. The electroluminescent device of claim 36, wherein: R i2 R is selected from the group consisting of: deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, or a combination thereof; R is selected from the group consisting of: halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, or a combination thereof; R ii1 , R ii2 , R ii3 , R ii4 At least one or two of them are selected, at each occurrence, identically or differently, 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 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, or a combination thereof.

40. The electroluminescent device according to claim 39, wherein R i2 R is selected from the group consisting of: substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, or a combination thereof; R is selected from the group consisting of substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, or a combination thereof; R ii1 , R ii2 , R ii3 , R ii4 At least one or two of the above are selected, at each occurrence, identically or differently, from a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, 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, or a combination thereof.

41. An electroluminescent device as claimed in claim 36 or 39, wherein: In formula 2-20 and formula 2-21, R x1 , R x2 , R i1 , R i2 , R i3 , R ii1 , R ii2 , R ii3 , R ii4 , at least one of R is selected, at each occurrence, identically or differently, from the group consisting of: substituted or unsubstituted alkyl having 3-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, and combinations thereof.

42. The electroluminescent device of claim 41, wherein R x1 , R x2 , R i1 , R i2 , R i3 , R ii1 , R ii2 , R ii3 , R ii4 , at least one of R is selected, at each occurrence, identically or differently, from the group consisting of substituted or unsubstituted alkyl having 3 to 10 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 10 ring carbon atoms, and combinations thereof.

43. The electroluminescent device of claim 1, wherein: L a Each occurrence is identically or differently selected from the group consisting of: In the above structure, TMS represents trimethylsilyl.

44. The electroluminescent device of claim 43, wherein said L a1 To L a188 The hydrogen in the structure can be partially or completely replaced by deuterium.

45. The electroluminescent device of claim 1 or 43, wherein: The second compound has M(L a ) m (L b ) n The general formula is: wherein the metal M is selected from metals with a relative atomic mass greater than 40, and L a , L b are the first and second ligands of the complex, respectively; Where m is 1 or 2, n is 1 or 2, and m+n is equal to the oxidation state of metal M; when m is greater than 1, multiple L a The same or different; when n is 2, the two L b Same or different; L a , L b can optionally be linked to form a multidentate ligand; L b Select from the following structures: Among them, R a , R b and R c Each occurrence is identical or different and indicates mono-, poly-, or unsubstituted; X c and X d Select O each time it appears; R a , R b , R c each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, cyano, isocyano, and combinations thereof; Adjacent substituent R a , R b , R c Can optionally be linked to form a ring.

46. ​​An electroluminescent device as claimed in claim 45, wherein the metal M is selected from Ir, Rh, Re, Os, Pt, Au or Cu.

47. The electroluminescent device of claim 46, wherein M is selected from Ir or Pt.

48. The electroluminescent device of claim 47, wherein M is Ir.

49. The electroluminescent device of claim 43, wherein L b Each occurrence is identically or differently selected from the group consisting of:

50. The electroluminescent device of claim 49, wherein: The second compound is an Ir complex and has a a )2(L b ) structure shown; when the second compound has Ir(L a )2(L b ) structure, the L a Choose from L a1 To L a188 Any one or any two of the group consisting of b Choose from L b1 To L b322 Any one of the groups.

51. The electroluminescent device of claim 50, wherein the second compound is selected from the group consisting of:

52. The electroluminescent device of claim 1, wherein the device emits red light or white light.

53. A display assembly comprising the electroluminescent device of any one of claims 1-52.

54. A compound combination comprising at least a first compound and a second compound; in, The first compound has a structure of HLE, and the H has a structure represented by formula A: In formula A, Each time Z1-Z3, Z6-Z8 appears, they are selected from CR z1 or N, Z4 and Z5 are selected from CR each time they appear, either identically or differently z2 , and the two substituents R in Z4 and Z5 are z2 are connected to form a ring, and the ring has at least 7 ring atoms; 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; E 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; R z1 each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, cyano, isocyano, hydroxyl, mercapto, and combinations thereof; R z2 each occurrence is identically or differently selected from the group consisting of hydrogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, hydroxyl, mercapto, and combinations thereof; Adjacent substituent R z1 , R z2 can optionally be linked to form a ring; The second compound is a metal complex, wherein the second compound has M(L a ) m (L b ) n The general formula is: wherein the metal M is selected from metals with a relative atomic mass greater than 40, and L a , L b are the first and second ligands of the complex, respectively; Where m is 1 or 2, n is 1 or 2, and m+n is equal to the oxidation state of metal M; when m is greater than 1, multiple L a The same or different; when n is 2, the two L b Same or different; L a , L b can be optionally linked to form a multidentate ligand; said L a Having a structure represented by Formula C: In formula C, ring A and ring B are each independently selected from a five-membered unsaturated carbocyclic ring, an aromatic ring having 6 to 30 carbon atoms, or a heteroaromatic ring having 3 to 30 carbon atoms; R i Each occurrence of R is the same or different, indicating mono-, poly- or unsubstituted; ii Each occurrence of the same or different means mono-, poly- or no-substitution; Y is selected from O, S or Se; X1-X2 are selected from CR in the same or different ways each time they appear x or N; R, R i , R ii and R x each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclyl having 3-20 ring atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, cyano, isocyano, and combinations thereof; Adjacent substituent R i , R x , R and R ii can optionally be linked to form a ring; L b Select from the following structures: Among them, R a , R b and R c Each occurrence is identical or different and indicates mono-, poly-, or unsubstituted; X c and X d Select O each time it appears; R a , R b and R c each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, cyano, isocyano, and combinations thereof; Adjacent substituent R a , R b and R c Can optionally be linked to form a ring.

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