Organic electroluminescent material and device thereof

Abstract

The invention discloses an organic electroluminescent material and a device thereof. The organic electroluminescent material is a compound with a structure as shown in a formula 1. The novel compounds have dark blue luminescence, can be used as luminescent materials in organic electroluminescent devices, and can provide better device performance, such as high external quantum efficiency and high current efficiency. The invention further discloses an organic electroluminescent device containing the compound with the structure shown in the formula 1 and a compound composition.

Description

Technical Field

[0001] The present invention relates to compounds for organic electronic devices, such as organic light-emitting devices, and more particularly to compounds having specific substituents, and organic electroluminescent devices and compound compositions containing the compounds. 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 electroluminescent 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] US20220081457A1 discloses a guest luminescent material, the general formula of which is: The application discloses some specific compounds with terphenyl substituents attached to the N of imidazole carbene, such as However, there is no substituent on the benzene ring directly connected to the imidazole carbene N in these specific compounds. Therefore, the application does not disclose or teach a metal complex having a substituent on the benzene ring directly connected to the imidazole carbene N, nor does it disclose or teach the excellent effects of such metal complexes in devices. US20230172053A1 discloses a guest luminescent material, which has the general formula Among them, CY 4 Selected from C 3 -C 60 Carbocyclic or C 1 -C 60 Heterocyclic group, R 42 The invention is selected from a wide range of groups including halogen, hydroxyl, cyano, nitro, alkyl, alkenyl, alkynyl, alkoxy, carbocyclic group, heterocyclic group, etc. The application discloses compounds in specific structures. etc. This application is for the specific adjacent positions on the pyridine ring with CY 4 Substituents and R 42 The present invention has studied the platinum complexes with disubstituted groups, but has not provided any teaching on the platinum complexes with disubstituted groups at other positions on the pyridine ring, and has not taught the excellent effects of such metal complexes in devices. 4 There is no substituent, or a deuterium substituent, or a para-substituted alkyl, and no disclosure or teaching is made on CY 4 The influence of ortho-substituted alkyl on metal complexes has not been studied. 4 The influence of the presence or absence of substituents or the difference in position of substituents on device performance.

[0009] The prior art discloses some blue phosphorescent materials for use in research on blue phosphorescent devices, and there are still certain limitations in the device efficiency of blue phosphorescent devices. Therefore, the application potential of such materials deserves further in-depth research and development. Summary of the invention

[0010] The present invention aims to provide a series of compounds having the structure of Formula 1 to solve at least some of the above problems. The compounds have deep blue luminescence and can be used as luminescent materials in organic electroluminescent devices. These novel compounds can provide excellent device performance, such as high external quantum efficiency and high current efficiency. These advantages are of great help in improving the level of blue phosphorescent devices.

[0011] According to one embodiment of the present invention, a compound having a structure of Formula 1 is disclosed:

[0012]

[0013] In formula 1,

[0014] Ring A, Ring B, Ring E, when they appear each time, are identically or differently selected from an unsaturated carbocyclic ring having 5 to 30 carbon atoms, an unsaturated heterocyclic ring having 3 to 30 carbon atoms, or a combination thereof;

[0015] Ring D is selected, identically or differently, at each occurrence, from an unsaturated heterocyclic ring having 1 to 30 carbon atoms;

[0016] The metal M is selected from metals with a relative atomic mass greater than 40;

[0017] L 1 , L 2 is selected, at each occurrence, identically or differently, from a single bond, O, S, Se, (CR'R') y , (SiR'R') y , PR', NR', 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; y is selected from 1, 2, 3, 4 or 5 at each occurrence, the same or different;

[0018] K 1 -K 4 is selected identically or differently at each occurrence from a single bond, O or S;

[0019] Z 1 -Z 3 is selected identically or differently at each occurrence from C or N;

[0020] The compound must meet at least one of the following four conditions:

[0021] (1) Ring A contains at least two substituents R a , and one of the substituents R a For R X1 , another substituent R a For R X2 ;

[0022] (2) Ring B has at least two substituents R b , and one of the substituents R b For R X1 , another substituent R b For R X2 ;

[0023] (3) Ring E contains at least two substituents R e , and one of the substituents R e For R X1 , another substituent R e For RX2 ;

[0024] (4) Ring D has at least two substituents R d , and one of the substituents R d For R X1 , another substituent R d For R X2 ;

[0025] The R X1 Having a structure represented by Formula 2:

[0026]

[0027] “*” indicates the position where Formula 2 is connected to Formula 1;

[0028] Y 1 -Y 4 Each occurrence is selected from CR y or N;

[0029] The R X2 , R y1 Each occurrence is identically or differently selected from the group consisting of substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3 to 20 carbon atoms, and combinations thereof;

[0030] The substituent R in Formula 1 has a structure represented by Formula 3:

[0031]

[0032] In formula 3,

[0033] Ring F, Ring G and Ring N are identically or differently selected at each occurrence from an unsaturated carbocyclic ring having 5 to 30 carbon atoms, an unsaturated heterocyclic ring having 3 to 30 carbon atoms, or a combination thereof;

[0034] Z 4 -Z 7 is selected identically or differently at each occurrence from C or N;

[0035] R a , R b , R d , R e , R f , R g , R n Each occurrence represents identically or differently monosubstituted, polysubstituted or unsubstituted;

[0036] R n1 Each occurrence is identical or different, indicating mono- or poly-substitution;

[0037] R', R a , R b , R d , R e , R y , R f , R g , R n The group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted an alkynyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted alkylgermanyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylgermanyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof;

[0038] There is at least one R on the ring N in formula 3 n1 , the R n1each occurrence is selected, identically or differently, from the group consisting of: deuterium, halogen, substituted or unsubstituted alkyl having 2 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted Alkynyl 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 alkylgermanyl groups having 3 to 20 carbon atoms, substituted or unsubstituted arylgermanyl groups having 6 to 20 carbon atoms, substituted or unsubstituted amino groups having 0 to 20 carbon atoms, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof;

[0039] The adjacent substituents R', R a , R b , R e , R y , R y1 , R f , R g , R n , R X2 Can optionally be linked to form a ring.

[0040] 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 contains the compound having the structure of Formula 1.

[0041] According to one embodiment of the present invention, a compound composition is disclosed, which comprises the compound having the structure of Formula 1.

[0042] The present invention discloses a series of compounds having the structure of Formula 1. The compounds have deep blue luminescence and can be used as luminescent materials in organic electroluminescent devices. These novel compounds can provide excellent device performance, such as high external quantum efficiency and high current efficiency. These advantages are of great help in improving the level of blue phosphorescent devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a schematic diagram of an organic light-emitting device that may contain the compounds and compound compositions disclosed herein.

[0044] Figure 2 is a schematic diagram of another organic light-emitting device that may contain the compounds and compound compositions disclosed herein. DETAILED DESCRIPTION

[0045] 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.

[0046] 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 one doped with F at a molar ratio of 50:1. 4

[0013] An example of an n-doped electron transport layer is BPhen doped with Li at a 1:1 molar ratio, as disclosed in U.S. Patent Application Publication No. 2003 / 0230980, which is incorporated by reference in its entirety.

[0013] An example of an n-doped electron transport layer is BPhen doped with Li at a 1:1 molar ratio, as disclosed in U.S. Patent Application Publication No. 2003 / 0230980, which is incorporated by reference in its entirety.

[0013] 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 a metal such as Mg:Ag and 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.

[0047] 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.

[0048] 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.

[0049] OLED also requires encapsulation layers, such as Figure 2 The organic light emitting device 200 is schematically and non-limitingly shown. Figure 1 The 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.

[0050] 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.

[0051] The materials and structures described herein may also be used in other organic electronic devices listed above.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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).

[0056] 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.

[0057] 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).

[0058] Definition of Substituent Terms

[0059] Halogen or halide - as used herein includes fluorine, chlorine, bromine and iodine.

[0060] 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.

[0061] 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.

[0062] Heteroalkyl - As used herein, a heteroalkyl group comprises one or more carbons in an alkyl chain substituted with a heteroatom selected from the group consisting of a nitrogen atom, an oxygen atom, a sulfur atom, a selenium atom, a phosphorus atom, a silicon atom, a germanium atom and a boron atom. The heteroalkyl group may be a heteroalkyl group having 1 to 20 carbon atoms, preferably a heteroalkyl group having 1 to 10 carbon atoms, and more preferably a heteroalkyl group having 1 to 6 carbon atoms. Examples of heteroalkyl include methoxymethyl, ethoxymethyl, ethoxyethyl, methylthiomethyl, ethylthiomethyl, ethylthioethyl, methoxymethoxymethyl, ethoxymethoxymethyl, ethoxyethoxyethyl, hydroxymethyl, hydroxyethyl, hydroxypropyl, mercaptomethyl, mercaptoethyl, mercaptopropyl, aminomethyl, aminoethyl, aminopropyl, dimethylaminomethyl, trimethylgermanylmethyl, trimethylgermanylethyl, trimethylgermanylisopropyl, dimethylethylgermanylmethyl, dimethylisopropylgermanylmethyl, tert-butyldimethylgermanylmethyl, triethylgermanylmethyl, triethylgermanylethyl, triisopropylgermanylmethyl, triisopropylgermanylethyl, trimethylsilylmethyl, trimethylsilylethyl, trimethylsilylisopropyl, triisopropylsilylmethyl, triisopropylsilylethyl. In addition, heteroalkyl may be optionally substituted.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] Heterocyclic group - as used herein, non-aromatic cyclic groups are considered. Non-aromatic heterocyclic groups include saturated heterocyclic groups with 3-20 ring atoms and unsaturated non-aromatic heterocyclic groups with 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 with 3 to 7 ring atoms, which include at least one heteroatom such as nitrogen, oxygen, silicon or sulfur. Examples of non-aromatic heterocyclic groups include oxirane, oxetane, tetrahydrofuranyl, tetrahydropyranyl, dioxopentanyl, dioxanyl, aziridinyl, dihydropyrrolyl, tetrahydropyrrolyl, piperidinyl, oxazolidinyl, morpholinyl, piperazinyl, oxepinyl, thiepinyl, azacycloheptinyl and tetrahydrothioxyl. In addition, the heterocyclic group may be optionally substituted.

[0067] 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 substituted with 1,2-azaborine, 1,3-azaborine, 1,4-azaborine, borazole and its aza analogs. In some embodiments, the heteroaryl group is substituted with 1,2-azaborine, 1,3-azaborine, 1,4-azaborine, borazole and its aza analogs. In some embodiments, the heteroaryl group is substituted with 1,2-azaborine, 1,3-azaborine, 1,4-azaborine, borazole and its aza analogs. In addition, the heteroaryl group may be optionally substituted.

[0068] 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.

[0069] 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.

[0070] 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,

[0071] 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.

[0072] 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.

[0073] Alkylgermanyl - As used herein, alkyl substituted germanyl is contemplated. The alkylgermanyl may be an alkylgermanyl having 3-20 carbon atoms, preferably an alkylgermanyl having 3 to 10 carbon atoms. Examples of alkylgermanyl include trimethylgermanyl, triethylgermanyl, methyldiethylgermanyl, ethyldimethylgermanyl, tripropylgermanyl, tributylgermanyl, triisopropylgermanyl, methyldiisopropylgermanyl, dimethylisopropylgermanyl, tri-tert-butylgermanyl, triisobutylgermanyl, dimethyltert-butylgermanyl, methyldi-tert-butylgermanyl. In addition, the alkylgermanyl may be optionally substituted.

[0074] Arylgermanyl - as used herein, encompasses germanyl substituted with at least one aryl or heteroaryl group. The arylgermanyl may be an arylgermanyl having 6 to 30 carbon atoms, preferably an arylgermanyl having 8 to 20 carbon atoms. Examples of arylgermanyl include triphenylgermanyl, phenyldibiphenylgermanyl, diphenylbiphenylgermanyl, phenyldiethylgermanyl, diphenylethylgermanyl, phenyldimethylgermanyl, diphenylmethylgermanyl, phenyldiisopropylgermanyl, diphenylisopropylgermanyl, diphenylbutylgermanyl, diphenylisobutylgermanyl, diphenyltert-butylgermanyl. In addition, the arylgermanyl may be optionally substituted.

[0075] 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.

[0076] 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 alkylgermanyl, substituted arylgermanyl, substituted amino, substituted acyl, substituted carbonyl, substituted carboxylic acid, Substituted ester groups, substituted sulfinyl groups, substituted sulfonyl groups, substituted phosphino groups refer to any one of alkyl groups, cycloalkyl groups, heteroalkyl groups, heterocyclic groups, aralkyl groups, alkoxy groups, aryloxy groups, alkenyl groups, alkynyl groups, aryl groups, heteroaryl groups, alkylsilyl groups, arylsilyl groups, alkylgermanyl groups, arylgermanyl groups, amino groups, acyl groups, carbonyl groups, carboxyl groups, ester groups, sulfinyl groups, sulfonyl groups and phosphino groups, which may be substituted by one or more of deuterium, halogen groups, unsubstituted alkyl groups having 1 to 20 carbon atoms, unsubstituted alkyl groups having 1 to 20 carbon atoms, Cycloalkyl having 3-20 ring carbon atoms, unsubstituted heteroalkyl having 1-20 carbon atoms, unsubstituted heterocyclyl having 3-20 ring atoms, unsubstituted aralkyl having 7-30 carbon atoms, unsubstituted alkoxy having 1-20 carbon atoms, unsubstituted aryloxy having 6-30 carbon atoms, unsubstituted alkenyl having 2-20 carbon atoms, unsubstituted alkynyl having 2-20 carbon atoms, unsubstituted aryl having 6-30 carbon atoms , unsubstituted heteroaryl having 3 to 30 carbon atoms, unsubstituted alkylsilyl having 3 to 20 carbon atoms, unsubstituted arylsilyl having 6 to 20 carbon atoms, unsubstituted alkylgermanyl having 3 to 20 carbon atoms, unsubstituted arylgermanyl having 6 to 20 carbon atoms, unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino and combinations thereof.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] In the compounds mentioned in the present disclosure, unless clearly 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 (including spirocyclic, bridged ring, condensed ring, etc.), 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.

[0081] 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:

[0082]

[0083] 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:

[0084]

[0085] 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:

[0086]

[0087] According to one embodiment of the present invention, a compound having a structure of Formula 1 is disclosed:

[0088]

[0089] In formula 1,

[0090] Ring A, Ring B, Ring E, when they appear each time, are identically or differently selected from an unsaturated carbocyclic ring having 5 to 30 carbon atoms, an unsaturated heterocyclic ring having 3 to 30 carbon atoms, or a combination thereof;

[0091] Ring D is selected, identically or differently, at each occurrence, from an unsaturated heterocyclic ring having 1 to 30 carbon atoms;

[0092] M is a metal and is selected from metals having a relative atomic mass greater than 40;

[0093] L 1 , L 2 is selected, at each occurrence, identically or differently, from a single bond, O, S, Se, (CR'R') y , (SiR'R') y , PR', NR', 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; y is selected from 1, 2, 3, 4 or 5 at each occurrence, the same or different;

[0094] K 1 -K 4 is selected identically or differently at each occurrence from a single bond, O or S;

[0095] Z 1 -Z 3 is selected identically or differently at each occurrence from C or N;

[0096] The compound must meet at least one of the following four conditions:

[0097] (1) Ring A contains at least two substituents R a , and one of the substituents R a For R X1 , another substituent R a For R X2 ;

[0098] (2) Ring B has at least two substituents R b , and one of the substituents R b For R X1 , another substituent R b For R X2;

[0099] (3) Ring E contains at least two substituents R e , and one of the substituents R e For R X1 , another substituent R e For R X2 ;

[0100] (4) Ring D has at least two substituents R d , and one of the substituents R d For R X1 , another substituent R d For R X2 ;

[0101] The R X1 Having a structure represented by Formula 2:

[0102]

[0103] “*” indicates the position where Formula 2 is connected to Formula 1;

[0104] Y 1 -Y 4 Each occurrence is selected from CR y or N;

[0105] The R X2 , R y1 Each occurrence is identically or differently selected from the group consisting of substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3 to 20 carbon atoms, and combinations thereof;

[0106] The substituent R in Formula 1 has a structure represented by Formula 3:

[0107]

[0108] In formula 3,

[0109] Ring F, Ring G and Ring N are identically or differently selected at each occurrence from an unsaturated carbocyclic ring having 5 to 30 carbon atoms, an unsaturated heterocyclic ring having 3 to 30 carbon atoms, or a combination thereof;

[0110] Z 4 -Z 7 is selected identically or differently at each occurrence from C or N;

[0111] R a , Rb , R d , R e , R f , R g , R n Each occurrence represents identically or differently monosubstituted, polysubstituted or unsubstituted;

[0112] R n1 Each occurrence is identical or different, indicating mono- or poly-substitution;

[0113] R', R a , R b , R d , R e , R y , R f , R g , R n The group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted an alkynyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted alkylgermanyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylgermanyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof;

[0114] There is at least one R on the ring N in formula 3 n1 , the R n1each occurrence is selected, identically or differently, from the group consisting of: deuterium, halogen, substituted or unsubstituted alkyl having 2 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted Alkynyl 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 alkylgermanyl groups having 3 to 20 carbon atoms, substituted or unsubstituted arylgermanyl groups having 6 to 20 carbon atoms, substituted or unsubstituted amino groups having 0 to 20 carbon atoms, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof;

[0115] The adjacent substituents R', R a , R b , R e , R y , R y1 , R f , R g , R n , R X2 Can optionally be linked to form a ring.

[0116] Herein, "unsaturated carbocycle" includes aromatic unsaturated carbocycle (ie, aromatic ring) and non-aromatic unsaturated carbocycle; "unsaturated heterocycle" includes aromatic unsaturated heterocycle (ie, heteroaromatic ring) and non-aromatic unsaturated heterocycle.

[0117] As used herein, “adjacent substituents R′, R a , R b , R e , R y , R y1 , R f , R g , R n , R X2 "can be optionally connected to form a ring" is intended to mean that adjacent groups of substituents, for example, between two substituents R', between two substituents R a Between the two substituents R b Between the two substituents R e Between the two substituents R yBetween the two substituents R f Between the two substituents R g Between the two substituents R n Between, the substituent R a Between R', the substituent R b Between R', the substituent R e Between R', the substituent R n and R f Between, the substituent R n and R g Between, the substituent R y and R y1 Between, the substituent R a and R X2 Between, the substituent R b and R X2 Between, and the substituent R e and R X2 Any one or more of these substituent groups may be connected to form a ring. Obviously, these adjacent substituents may not be connected to form a ring.

[0118] According to one embodiment of the present invention, the compound has M(L a )(L b ) is a structure represented by the general formula, wherein L a and L b are the first ligand and the second ligand coordinated to the metal M, respectively, and the L a Having a structure represented by formula A: The “#” in formula A indicates that b The location of the connection; the L b Having a structure represented by formula B: The formula B Indicates that L a The location of the connection.

[0119] According to one embodiment of the present invention, the compound must satisfy at least one of the following four conditions:

[0120] (1) Ring A has at least two substituents R in the ortho position a , and one of the substituents R a For R X1 , another substituent R a For R X2 ;

[0121] (2) There are at least two substituents R in the ortho position in ring B b , and one of the substituents R b For R X1 , another substituent Rb For R X2 ;

[0122] (3) Ring E has at least two substituents R in the ortho position e , and one of the substituents R e For R X1 , another substituent R e For R X2 ;

[0123] (4) Ring D has at least two substituents R in the ortho position d , and one of the substituents R d For R X1 , another substituent R d For R X2 .

[0124] According to one embodiment of the present invention, the M is selected from Pt or Pd.

[0125] According to one embodiment of the present invention, wherein the M is selected from Pt.

[0126] According to one embodiment of the present invention, the ring A, ring B, ring E, ring F, ring G and ring N are selected from a five-membered unsaturated carbon ring, an aromatic ring with 6-30 carbon atoms, or a heteroaromatic ring with 3-30 carbon atoms, the same or different when they appear each time.

[0127] According to one embodiment of the present invention, the ring A, ring B, ring E, ring F, ring G and ring N are 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, the same or different when they appear each time.

[0128] According to one embodiment of the present invention, the ring A, ring B, ring E, ring F, ring G and ring N are selected from a benzene ring, a pyridine ring, an indene ring, a fluorene ring, an indole ring, a carbazole ring, a benzofuran ring, a dibenzofuran ring, a benzosilole ring, a dibenzosilole ring, a benzothiophene ring, a dibenzothiophene ring, a dibenzoselenophene ring, a cyclopentadiene ring, a furan ring, a thiophene ring, or a silole ring, the same or different when they appear each time.

[0129] According to one embodiment of the present invention, the ring D is selected from unsaturated heterocyclic rings having 1 to 24 carbon atoms, the same or different each time it occurs.

[0130] According to one embodiment of the present invention, the ring D is selected from unsaturated heterocyclic rings having 1 to 18 carbon atoms, the same or different each time it occurs.

[0131] According to one embodiment of the present invention, the ring D is selected from unsaturated heterocyclic rings having 3 to 12 carbon atoms, the same or different each time it occurs.

[0132] According to one embodiment of the present invention, the ring D is selected from an imidazole carbene ring or a benzimidazole carbene ring the same or different each time it appears.

[0133] According to one embodiment of the present invention, the ring A has at least two substituents R a , and one of the substituents R a For R X1 , another substituent R a For R X2 .

[0134] According to one embodiment of the present invention, the ring A has two substituents R at the ortho position. a , and one of the substituents R a For R X1 , another substituent R a For R X2 .

[0135] In this article, "Ring A has two substituents R in the ortho position a " is intended to indicate that there are two adjacent ring atoms in ring A that are connected to substituents R a .

[0136] According to one embodiment of the present invention, the ring A has two substituents R at the ortho position. a , and one of the substituents R a For R X1 , another substituent R a For R X2 ; said R X1 In Z 1 The counterpoint.

[0137] According to one embodiment of the present invention, wherein said R X1 Having a structure represented by Formula 2:

[0138]

[0139] “*” indicates the position where Formula 2 is connected to Formula 1;

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

[0141] The R yeach occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, 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 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 arylsilanyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3-20 carbon atoms, substituted or unsubstituted arylgermanyl having 6-20 carbon atoms, and combinations thereof;

[0142] The R X2 , R y1 Each occurrence is identically or differently selected from the group consisting of substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3 to 20 carbon atoms, and combinations thereof.

[0143] According to one embodiment of the present invention, wherein said L 1 Selected from single bond, O, S, (CR'R') y , (SiR'R') y , PR', NR', or a combination thereof; said y is 1 or 2.

[0144] According to one embodiment of the present invention, wherein said L 1 is selected from a single bond, O or S.

[0145] According to one embodiment of the present invention, wherein said L 1 Select from single bonds.

[0146] According to one embodiment of the present invention, wherein the K 1 -K 4 Select from single bonds.

[0147] According to one embodiment of the present invention, wherein said Z 1 Selected from N, Z 2 and Z 3 Selected from C.

[0148] According to one embodiment of the present invention, the compound has a structure represented by one of Formula 1-1 to Formula 1-8:

[0149]

[0150]

[0151] In Formula 1-1 to Formula 1-8,

[0152] L 2 is selected, at each occurrence, identically or differently, from a single bond, O, S, Se, (CR'R') y , (SiR'R') y , PR', NR', 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; y is selected from 1, 2, 3, 4 or 5 at each occurrence, the same or different;

[0153] X 1 -X 4 One of them is selected from CR X1 , and one selected from CR X2 , and the other two are independently selected from CR x or N;

[0154] X 5 -X 16 Each occurrence is selected from CR x or N;

[0155] D 1 -D 4 Each occurrence is selected from CR d or N;

[0156] The R X1 Having a structure represented by Formula 2:

[0157]

[0158] “*” indicates the position where Formula 2 is connected with Formulas 1-1 to 1-8;

[0159] Y 1 -Y 4 Each occurrence is selected from CR y or N;

[0160] The R X2 , R y1 Each occurrence is identically or differently selected from the group consisting of substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3 to 20 carbon atoms, and combinations thereof;

[0161] The substituent R has a structure shown in Formula 3-1:

[0162]

[0163] In formula 3-1, F 1 To F 5 Each independently selected from CR f or N; G 1 To G 5 Each independently selected from CR g or N; N 1 To N 3 Each independently selected from CR n1 , CR n or N, and N 1 To N 3 At least one is CR n1 ;

[0164] The R n1 each occurrence is selected, identically or differently, from the group consisting of: deuterium, halogen, substituted or unsubstituted alkyl having 2 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted Alkynyl 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 alkylgermanyl groups having 3 to 20 carbon atoms, substituted or unsubstituted arylgermanyl groups having 6 to 20 carbon atoms, substituted or unsubstituted amino groups having 0 to 20 carbon atoms, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof;

[0165] The R', R x , R d , R y , R f , R g , R nThe group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted an alkynyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted alkylgermanyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylgermanyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof;

[0166] The adjacent substituents R', R x , R y , R y1 , R x2 , R f , R g , R n Can optionally be linked to form a ring.

[0167] In this embodiment, "the adjacent substituents R', R x , R y , R y1 , R x2 , R f , R g , R n "can be optionally connected to form a ring" is intended to mean that adjacent groups of substituents, for example, between two substituents R', between two substituents R x Between the two substituents R y Between the two substituents R f Between the two substituents R g Between the two substituents R n Between, the substituent R x Between R', the substituent R y and R y1 Between, the substituent R x and R X2 Between, the substituent R n and R f Between, and the substituent Rn and R g Any one or more of these substituent groups may be connected to form a ring. Obviously, these adjacent substituents may not be connected to form a ring.

[0168] According to one embodiment of the present invention, the compound has a structure represented by Formula 1-1 or Formula 1-2.

[0169] According to one embodiment of the present invention, wherein the X 1 -X 4 The two adjacent positions are selected from CR X1 and CR X2 , and the other two are independently selected from CR x Or N. In this embodiment, "X 1 -X 4 There are three situations in which the two adjacent positions in X 1 and X 2 In the ortho position, X 2 and X 3 In the ortho position, X 3 and X 4 In adjacent position.

[0170] According to one embodiment of the present invention, wherein the X 2 Selected from CR X2 , X 3 Selected from CR X1 , X 1 and X 4 Each independently selected from CR x or N.

[0171] According to one embodiment of the present invention, in Formula 1-1 to Formula 1-8, wherein X 2 Selected from CR X2 , X 3 Selected from CR X1 , X 1 , X 4 and X 5 -X 16 Each independently selected from CR x .

[0172] According to one embodiment of the present invention, the R xEach occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, 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.

[0173] According to one embodiment of the present invention, in Formula 1-1 to Formula 1-8, wherein D 1 -D 4 Each occurrence is selected from CR d .

[0174] According to one embodiment of the present invention, the R d Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, 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.

[0175] According to one embodiment of the present invention, the R d 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.

[0176] According to one embodiment of the present invention, wherein said Y 1 -Y 4 Each independently selected from CR y .

[0177] According to one embodiment of the present invention, wherein said R y Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, 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 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 arylsilanyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3-20 carbon atoms, substituted or unsubstituted arylgermanyl having 6-20 carbon atoms, and combinations thereof.

[0178] According to one embodiment of the present invention, wherein said R y Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, fluorine, cyano, 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 aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, and combinations thereof.

[0179] According to one embodiment of the present invention, wherein said R y Each occurrence is identically or differently selected from hydrogen or deuterium.

[0180] According to one embodiment of the present invention, wherein said R x2 , R y1 Each occurrence is identically or differently selected from substituted or unsubstituted alkyl having 1 to 20 carbon atoms or substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms.

[0181] According to one embodiment of the present invention, wherein said R x2 , R y1 Each occurrence is identically or differently selected from the group consisting of methyl, partially or fully deuterated methyl, ethyl, partially or fully deuterated ethyl, n-propyl, partially or fully deuterated n-propyl, isopropyl, partially or fully deuterated isopropyl, cyclopropyl, partially or fully deuterated cyclopropyl, n-butyl, partially or fully deuterated n-butyl, isobutyl, partially or fully deuterated isobutyl, tert-butyl, partially or fully deuterated tert-butyl, cyclopentyl, partially or fully deuterated cyclopentyl, cyclohexyl, partially or fully deuterated cyclohexyl, and combinations thereof.

[0182] According to one embodiment of the present invention, wherein the N 1 and N 3 Each independently selected from CR n , N 2 Selected from CR n1 , and the R n1 Each occurrence is identically or differently selected from the group consisting of: deuterium, halogen, cyano, substituted or unsubstituted alkyl having 2-20 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 alkylgermanyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, and combinations thereof.

[0183] According to one embodiment of the present invention, wherein the N 1 and N 3 Each independently selected from CR n , N 2 Selected from CR n1 , and the R n1 Each occurrence is identically or differently selected from the group consisting of: deuterium, fluorine, cyano, substituted or unsubstituted alkyl having 2-7 carbon atoms, substituted or unsubstituted cycloalkyl having 3-8 ring carbon atoms, substituted or unsubstituted aryl having 6-12 carbon atoms, substituted or unsubstituted heteroaryl having 3-12 carbon atoms, substituted or unsubstituted alkylsilyl having 3-6 carbon atoms, substituted or unsubstituted alkylgermanyl having 3-6 carbon atoms, and combinations thereof.

[0184] According to one embodiment of the present invention, wherein the N 1 and N 3 Each independently selected from CR n , N 2 Selected from CR n1 , and the R n1 Each occurrence is identically or differently selected from the group consisting of ethyl, partially or fully deuterated ethyl, n-propyl, partially or fully deuterated n-propyl, isopropyl, partially or fully deuterated isopropyl, cyclopropyl, partially or fully deuterated cyclopropyl, n-butyl, partially or fully deuterated n-butyl, isobutyl, partially or fully deuterated isobutyl, tert-butyl, partially or fully deuterated tert-butyl, cyclopentyl, partially or fully deuterated cyclopentyl, cyclohexyl, partially or fully deuterated cyclohexyl, and combinations thereof.

[0185] According to one embodiment of the present invention, wherein said R n Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, substituted or unsubstituted alkyl having 2-20 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.

[0186] According to one embodiment of the present invention, wherein said R nEach occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, substituted or unsubstituted alkyl having 2-20 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, and combinations thereof.

[0187] According to one embodiment of the present invention, wherein said R n Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, fluorine, methyl, deuterated methyl, ethyl, n-propyl, isopropyl, cyclopropyl, n-butyl, isobutyl, tert-butyl, cyclopentyl, cyclohexyl, phenyl, trimethylsilyl, carbazolyl, indolyl, benzofuranyl, dibenzofuranyl, benzothiolaryl, dibenzothiolaryl, benzothiophenyl, dibenzothiophenyl, dibenzoselenophene, and combinations thereof.

[0188] According to one embodiment of the present invention, wherein the F 1 To F 5 Each independently selected from CR f ; G 1 To G 5 Each independently selected from CR g ; said R f , R g Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, 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.

[0189] According to one embodiment of the present invention, wherein the F 1 To F 5 Each independently selected from CR f ; G 1 To G 5 Each independently selected from CR g ; said R f , R g Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, fluorine, methyl, deuterated methyl, ethyl, n-propyl, isopropyl, cyclopropyl, n-butyl, isobutyl, tert-butyl, cyclopentyl, cyclohexyl, phenyl, trimethylsilyl, carbazolyl, indolyl, benzofuranyl, dibenzofuranyl, benzothiolaryl, dibenzothiolaryl, benzothiophenyl, dibenzothiophenyl, dibenzoselenophene, and combinations thereof.

[0190] According to one embodiment of the present invention, wherein the F 1 To F 5 and G 1 To G 5 Each is independently selected from CH or CD.

[0191] According to one embodiment of the present invention, wherein the F 1 To F 5 and G 1 To G 5 Each is independently selected from CD.

[0192] According to one embodiment of the present invention, the substituent R is selected from the group consisting of structures An-1 to An-79 the same or different each time it appears, and the specific structures of An-1 to An-79 are shown in claim 14.

[0193] According to one embodiment of the present invention, the hydrogen in the structures An-1 to An-79 can be partially or completely replaced by deuterium.

[0194] According to one embodiment of the present invention, wherein said L 2 Each occurrence is identically or differently selected from a single bond, O, S, (CR'R') y , (SiR'R') y , PR', NR', and combinations thereof; said y is 1 or 2.

[0195] According to one embodiment of the present invention, wherein said L 2 is selected identically or differently on each occurrence from a single bond, O or S.

[0196] According to one embodiment of the present invention, wherein said L 2 Selected from O.

[0197] According to one embodiment of the present invention, the compound has Pt(L a )(L b ) represents a structure where L a and L b are the first ligand and the second ligand coordinated with the metal Pt, respectively. a Choose from L a 1-1 to L a 1-62, L a 2-1 to L a 2-25, L a 3-1 to L a 3-18, and L a 4-1 to L a 4-41 group, the L b Choose from L b1-1 to L b 1-16, L b 2-1 to L b 2-17, L b 3-1 to L b 3-23, L b 4-1 to L b 4-25, L b 5-1 to L b 5-20, and L b 6-1 to L b For a group consisting of 6-17 people, the L a 1-1 to L a 1-62, L a 2-1 to L a 2-25, L a 3-1 to L a 3-18, L a 4-1 to L a 4-41, L b 1-1 to L b 1-16, L b 2-1 to L b 2-17, L b 3-1 to L b 3-23, L b 4-1 to L b 4-25, L b 5-1 to L b 5-20, and L b 6-1 to L b For the specific structure of 6-17, please see claim 16.

[0198] According to one embodiment of the present invention, the compound is selected from the group consisting of compound Pt1 to compound Pt528, and the specific structures of compound Pt1 to compound Pt528 are shown in claim 16.

[0199] According to one embodiment of the present invention, an electroluminescent device is disclosed, comprising:

[0200] anode,

[0201] cathode,

[0202] and an organic layer disposed between the anode and the cathode, wherein the organic layer comprises a compound having a structure of Formula 1, and the compound having a structure of Formula 1 is any one of the above embodiments.

[0203] According to an embodiment of the present invention, the organic layer is a light-emitting layer, and the compound is a light-emitting material.

[0204] According to an embodiment of the present invention, the device emits blue light.

[0205] According to an embodiment of the present invention, the device emits white light.

[0206] According to an embodiment of the present invention, the device emits deep blue light.

[0207] According to an embodiment of the present invention, the maximum emission wavelength of the device is less than or equal to 475 nm.

[0208] According to an embodiment of the present invention, the maximum emission wavelength of the device is 410nm-475nm.

[0209] According to an embodiment of the present invention, the maximum emission wavelength of the device is 420nm-475nm.

[0210] According to an embodiment of the present invention, the maximum emission wavelength of the device is 430nm-475nm.

[0211] According to an embodiment of the present invention, the maximum emission wavelength of the device is 440nm-475nm.

[0212] According to an embodiment of the present invention, the maximum emission wavelength of the device is 450nm-475nm.

[0213] According to an embodiment of the present invention, the maximum emission wavelength of the device is 460nm-475nm.

[0214] According to an embodiment of the present invention, the maximum emission wavelength of the device is 460nm-470nm.

[0215] According to an embodiment of the present invention, the light-emitting layer comprises at least one host material.

[0216] According to an embodiment of the present invention, the light-emitting layer comprises at least two host materials.

[0217] According to one embodiment of the present invention, the main material contains at least one chemical group selected from the group consisting of: benzene, pyridine, pyrimidine, triazine, carbazole, azacarbazole, indolecarbazole, dibenzothiophene, azadibenzothiophene, dibenzofuran, azadibenzofuran, dibenzoselenophene, triphenylene, azatriphenylene, fluorene, silylfluorene, naphthalene, quinoline, isoquinoline, quinazoline, quinoxaline, phenanthrene, azaphenanthrene, and combinations thereof.

[0218] According to one embodiment of the present invention, the at least one host material has a structure represented by Formula 4:

[0219]

[0220] In formula 4,

[0221] Z 40 Selected from O or S;

[0222] Z 41 -Z 48 Each occurrence is selected from CR 4 , CR 4 'or N, and Z 41 -Z 48 At least one of them is selected from N, and at least one of them is selected from CR 4 ';

[0223] The R 4 ' is selected, at each occurrence, identically or differently, from a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, or a combination thereof;

[0224] The R 4 The group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted an alkynyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted alkylgermanyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylgermanyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof.

[0225] According to one embodiment of the present invention, in Formula 4, the Z 41 -Z 48 At least one of them is selected from N, and at least two of them are selected from CR 4 '.

[0226] According to one embodiment of the present invention, in Formula 4, the Z 41 -Z48 Only one of them is selected from N, and only two of them are selected from CR 4 '.

[0227] According to one embodiment of the present invention, in Formula 4, the Z 42 Selected from N, Z 41 and Z 46 Selected from CR 4 '.

[0228] According to one embodiment of the present invention, the at least one host material has a structure represented by Formula 5:

[0229]

[0230] L 11 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;

[0231] Ar 11 is selected from a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted amino group having 0 to 30 carbon atoms, or a combination thereof;

[0232] R 5 Each occurrence of the same or different means mono-, poly- or no-substitution;

[0233] R 5 The group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted an alkynyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted alkylgermanyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylgermanyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof;

[0234] Adjacent substituent R 5 Can optionally be linked to form a ring.

[0235] In this context, adjacent substituents R 5 can be optionally linked to form a ring, and is intended to represent two substituents R 5 Obviously, the two substituents R 5 They may not be connected to form a ring.

[0236] According to one embodiment of the present invention, the at least one host material has a structure represented by Formula 5-1:

[0237]

[0238] L 11 , L 12 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;

[0239] Ar 11 is selected from a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted amino group having 0 to 30 carbon atoms, or a combination thereof;

[0240] R 5 Each occurrence of the same or different means mono-, poly- or no-substitution;

[0241] R 5The 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 heterocyclyl radicals having 3 to 20 ring 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 alkene radicals having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted alkylgermanyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylgermanyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof;

[0242] Adjacent substituent R 5 Can optionally be linked to form a ring.

[0243] According to one embodiment of the present invention, the at least one host material has a structure represented by Formula 5-2:

[0244]

[0245] Ar 11 is selected from a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted amino group having 0 to 30 carbon atoms, or a combination thereof;

[0246] L 11 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;

[0247] R 5 Each occurrence of the same or different means mono-, poly- or no-substitution;

[0248] R 5The 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 heterocyclyl radicals having 3 to 20 ring 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 alkene radicals having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted alkylgermanyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylgermanyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof;

[0249] Adjacent substituent R 5 Can optionally be linked to form a ring.

[0250] According to one embodiment of the present invention, wherein R 5 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, 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.

[0251] According to one embodiment of the present invention, wherein said R 5 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, substituted or unsubstituted aryl having 6 to 18 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 18 carbon atoms, and combinations thereof.

[0252] According to one embodiment of the present invention, wherein said R 5 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, fluorine, cyano, phenyl, biphenyl, triphenylene, indenyl, fluorenyl, indolyl, carbazolyl, benzofuranyl, dibenzofuranyl, benzothiolaryl, dibenzothiolaryl, benzothiophenyl, dibenzothiophenyl, dibenzoselenophene, and combinations thereof.

[0253] According to one embodiment of the present invention, wherein said L 11 is selected from a single bond, a substituted or unsubstituted arylene group having 6 to 18 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 18 carbon atoms, or a combination thereof.

[0254] According to one embodiment of the present invention, wherein said L 11 is selected from a single bond, phenylene, biphenylene, triphenylene, indenylene, fluorenylene, or a combination thereof.

[0255] According to one embodiment of the present invention, wherein the Ar 11 is selected from a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, or a combination thereof.

[0256] According to one embodiment of the present invention, wherein the Ar 11 Selected from the group consisting of phenyl, biphenyl, triphenylene, indenyl, fluorenyl, indolyl, carbazolyl, benzofuranyl, dibenzofuranyl, benzothiolaryl, dibenzothiolaryl, benzothiophenyl, dibenzothiophenyl, dibenzoselenophene, and combinations thereof.

[0257] According to another embodiment of the present invention, a compound composition is disclosed, which comprises a compound having a structure of Formula 1, wherein the compound having a structure of Formula 1 is shown in any of the above embodiments.

[0258] Combination with other materials

[0259] 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.

[0260] The materials described herein as specific layers that can be used in organic light-emitting devices can be used in combination with a variety of other materials present in the device. For example, the compounds disclosed herein can be used in combination with a variety of luminescent 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.

[0261] In the embodiment of material synthesis, unless otherwise specified, all reactions are carried out under nitrogen protection. All reaction solvents are anhydrous and used as they are from commercial sources. All reagents not otherwise specified are used as they are from commercial sources. The synthetic product uses one or more conventional equipment in the art (including but not limited to Bruker's nuclear magnetic resonance instrument, Shimadzu's liquid chromatograph, liquid chromatography-mass spectrometer, gas chromatography-mass spectrometer, differential scanning calorimeter, Shanghai Lingguang Technology's fluorescence spectrophotometer, Wuhan Cost's electrochemical workstation, Anhui Bei Yi Ke's sublimator, etc.), and the structure is confirmed and the characteristics are tested by methods well known to those skilled in the art. In the embodiment of the device, the characteristics of the device are also tested by methods well known to those skilled in the art using conventional equipment in the art (including but not limited to Angstrom Engineering's evaporation machine, Suzhou Fushida's optical test system, life test system, Beijing Liangtuo's ellipsometer, etc.). Since those skilled in the art are aware of the use of the above-mentioned equipment, test methods and other related contents, it is possible to obtain the inherent data of the sample with certainty and without being affected, so the above-mentioned related contents are no longer elaborated in this patent.

[0262] Material synthesis example:

[0263] The preparation method of the compound of the present invention is not limited, and the following compounds are typically but not limitedly exemplified, and their synthetic routes and preparation methods are as follows:

[0264] Synthesis Example 1: Synthesis of Compound Pt296

[0265] Step 1: Synthesis of intermediate 1

[0266]

[0267] Under nitrogen conditions, 2,4-dibromo-5-methylpyridine (4.8 g, 19.2 mmol), 2-(3-chlorophenoxy)-9H-carbazole (6.7 g, 22.9 mmol), cuprous iodide (361 mg, 1.9 mmol), N-methylimidazole (0.314 g, 3.8 mmol), lithium tert-butoxide (3.1 g, 38.7 mmol) were added to a flask, toluene (190 mL) was added, the mixture was heated to 110 ° C, refluxed overnight, and the reaction was detected by TLC until the end of the reaction. The mixture was cooled to room temperature, the reaction solution was extracted with dichloromethane, the organic layer was washed three times with sodium chloride aqueous solution, dried over anhydrous magnesium sulfate, concentrated and purified by column chromatography to obtain intermediate 1 (7.7 g, 16.7 mmol).

[0268] Step 2: Synthesis of intermediate 2

[0269]

[0270] Under nitrogen conditions, intermediate 1 (7.7 g, 16.7 mmol), 2-isopropylphenylboronic acid (3.3 g, 20.1 mmol), Pd(PPh 3 ) 4 (1.0 g, 0.9 mmol) and potassium carbonate (4.6 g, 33.3 mmol) were dissolved in a mixed solvent (toluene: ethanol: water = 4: 1: 1, 84 mL in total), heated to reflux, and reacted overnight. After the reaction was complete, the reaction solution was extracted with dichloromethane, the organic layer was washed three times with sodium chloride aqueous solution, dried over anhydrous magnesium sulfate, concentrated, and purified by column chromatography to obtain intermediate 2 (4.7 g, 9.4 mmol).

[0271] Step 3: Synthesis of intermediate 3

[0272]

[0273] Under nitrogen, intermediate 2 (4.7 g, 9.4 mmol) was added to a flask, potassium tert-butoxide (1.05 g, 9.4 mmol) was added, deuterated dimethyl sulfoxide (15 mL) was added, and the mixture was reacted overnight at 90° C. After the reaction was completed by TLC detection, the mixture was cooled to room temperature, and the reaction solution was extracted with dichloromethane. The organic layer was washed three times with sodium chloride aqueous solution, dried over anhydrous magnesium sulfate, concentrated, and purified by column chromatography to obtain intermediate 3 (3.3 g, 6.5 mmol).

[0274] Step 4: Synthesis of intermediate 5

[0275]

[0276] Under nitrogen conditions, intermediate 3 (3.3 g, 6.5 mmol), intermediate 4 (2.5 g, 6.2 mmol), Pd(OAc) 2 (0.07 g, 0.31 mmol), XPhos (0.296 g, 0.62 mmol), cesium carbonate (4.0 g, 12.4 mmol) and xylene (62 mL) were added to a flask. The reaction was heated to 140°C and stirred overnight. After the reaction was completed, it was detected by TLC. The reaction was cooled to room temperature and the reaction solution was extracted with dichloromethane. The organic layer was washed three times with aqueous sodium chloride solution, dried over anhydrous magnesium sulfate, concentrated and purified by column chromatography to obtain intermediate 5 (4.4 g, 5.1 mmol).

[0277] Step 5: Synthesis of intermediate 6

[0278]

[0279] Under nitrogen, intermediate 5 (4.4 g, 5.1 mmol), triethyl orthoformate (43.7 g, 295.8 mmol) and concentrated hydrochloric acid (1 mL) were added to a flask. The reaction temperature was raised to 100 °C and stirred overnight. After the reaction was completed by TLC detection, the mixture was cooled to room temperature. The reaction solution was extracted with dichloromethane, dried over anhydrous magnesium sulfate, concentrated and purified by column chromatography to obtain intermediate 6 (3.1 g, 3.4 mmol).

[0280] Step 6: Synthesis of compound Pt296

[0281]

[0282] Under nitrogen conditions, intermediate 6 (3.1 g, 3.4 mmol), Ag 2 O (0.392g, 1.7mmol), added to DCE (34mL), reacted at room temperature for 24h, after the reaction was complete, the solvent was evaporated under reduced pressure, and then (1,5-cyclooctadiene) platinum dichloride (1.3g, 3.4mmol) was added to the flask, and o-dichlorobenzene (o-DCB, 35mL) was added, and the reaction was heated to 190℃ and stirred for 48h. After cooling to room temperature, the reaction solution was extracted with dichloromethane, the organic layer was washed three times with sodium chloride aqueous solution, dried over anhydrous magnesium sulfate, and purified by column chromatography to obtain compound Pt296 (1.4g, 1.3mmol). The product was identified as the target product with a molecular weight of 1074.4.

[0283] Those skilled in the art should be aware that the above preparation method is only an illustrative example, and those skilled in the art can obtain other compound structures of the present invention by improving it.

[0284] The compound of the specific structure of Formula 1 disclosed in the present invention realizes deep blue and more saturated luminescence. The photoluminescence spectrum (PL) data provided below proves that the compound of Formula 1 of the present invention has deep blue and more saturated luminescence.

[0285] The photoluminescence spectra (PL) data of the compound Pt296 of the present invention and the comparative compound Pt-A ​​were measured using a fluorescence spectrophotometer of model No. 98 produced by Shanghai No. 9 Technology Co., Ltd. The compound of the present invention and the comparative compound were respectively prepared with HPLC grade toluene at a concentration of 3x10 -5 mol / L of the test solution, and then excited with 350nm wavelength light at room temperature (298K) and measured its emission spectrum. The measurement results are shown in Table 1.

[0286] Table 1 Photoluminescence spectrum (PL) data

[0287]

[0288]

[0289] The structure of the compound to be tested is shown below:

[0290]

[0291] discuss:

[0292] Table 1 shows the PL data of the compound Pt296 of the present invention and the comparative compound Pt-A. The maximum emission wavelength of the comparative compound Pt-A ​​is 482nm, emitting light blue light, and the half-peak width is very wide, reaching 63.94nm. The compound Pt296 of the present invention emits dark blue light. Compared with the comparative compound Pt-A, its maximum emission wavelength is greatly blue-shifted by 17nm, and the half-peak width is greatly narrowed by 35.87nm, achieving a bluer and more saturated luminescence. The difference between the compound Pt296 of the present invention and the comparative compound Pt-A ​​is only whether there is an ortho-substituent on the phenyl group on the pyridine ring, which shows that the compound of the present invention has a specific R y1 The substituent achieves deep blue phosphorescence emission, which is unexpected for those skilled in the art and has potential application value in deep blue phosphorescence.

[0293] The preparation method of the electroluminescent device is not limited. The preparation method of the following embodiment is only an example and should not be construed as limiting. Those skilled in the art can reasonably improve the preparation method of the following embodiment based on the prior art. For example, the ratio of various materials in the light-emitting layer is not particularly limited. 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 85%-99%, and the light-emitting material can account for 1%-15%. 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 99:1 to 1:99; or, the ratio can be 80:20 to 20:80. 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 evaporator 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.

[0294] Device Embodiment

[0295] Device Example 1

[0296] First, the glass substrate with an 80nm 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 -7 Compound HT and compound HI were co-deposited (weight ratio of 97:3) as a hole injection layer (HIL) with a thickness of Compound HT was used as a hole transport layer (HTL) with a thickness of Compound EB is used as an electron blocking layer (EBL) with a thickness of Then, the compound P-Host as the first host, the compound HB as the second host, and the compound Pt296 of the present invention as the dopant were co-evaporated (weight ratio of 61.6:26.4:12) to serve as the light-emitting layer (EML) with a thickness of Compound HB was used as the hole blocking layer (HBL) with a thickness of On the hole blocking layer, compound ET and 8-hydroxyquinoline-lithium (Liq) were co-evaporated (weight ratio of 40:60) as an electron transport layer (ETL) with a thickness of Finally, evaporation LiF with a thickness of 1000 nm was used as an electron injection layer, and the The device was then transferred back to the glove box and encapsulated with a glass cover and a moisture getter to complete the device.

[0297] Device Comparison Example 1

[0298] The preparation method of device comparative example 1 is the same as that of device example 1, except that compound Pt-B is used instead of compound Pt296 in the light emitting layer (EML).

[0299] Device Comparison Example 2

[0300] The preparation method of device comparative example 2 is the same as that of device example 1, except that compound Pt-C is used instead of compound Pt296 in the light emitting layer (EML).

[0301] The detailed device layer structure and thickness are shown in the table below. For layers using more than one material, different compounds are doped in the weight ratios recorded.

[0302] Table 2 Partial device structures of device embodiments and comparative examples

[0303]

[0304] The material structure used in the device is shown below:

[0305]

[0306]

[0307] At 10mA / cm 2 The CIE values ​​of Example 1, Comparative Example 1 and Comparative Example 2 were measured, and the maximum emission wavelength (λ max ), current efficiency (CE) and external quantum efficiency (EQE). The relevant data are shown in Table 3.

[0308] Table 3 Device data

[0309]

[0310] From the data in Table 3, it can be seen that both the embodiment and the comparative example achieve deep blue phosphorescent emission. The CE and EQE of Comparative Example 1 and Comparative Example 2 are both at a relatively high level in deep blue phosphorescent devices. The difference between the Pt complexes used in the embodiment and the comparative example 1 is only whether the benzene ring connected to the N in the imidazole carbene has the specific R n1 Substituents, while Example 1 further improves CE by 36.2% and EQE by 27.6% on the basis thereof; the difference between the Pt complexes used in Example 1 and Comparative Example 2 is only whether the pyridine ring has the specific R X1 and R X2Substituents, and Example 1 further improved CE by 49.7% and EQE by 23.3% on the basis of the above. These data all prove the advantages of the specific compound of Formula 1 of the present invention, and it is unexpected that the compound of Formula 1 of the present invention can significantly improve the CE and EQE of the device. These compounds of Formula 1 of the present invention with high EQE and high CE have potential application prospects in blue phosphorescence.

[0311] 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. A compound having a structure of Formula 1: In formula 1, Ring A, Ring B, Ring E, when they appear each time, are identically or differently selected from an unsaturated carbocyclic ring having 5 to 30 carbon atoms, an unsaturated heterocyclic ring having 3 to 30 carbon atoms, or a combination thereof; Ring D is selected, identically or differently, at each occurrence, from an unsaturated heterocyclic ring having 1 to 30 carbon atoms; The metal M is selected from metals with a relative atomic mass greater than 40; L1, L2 each time appearing are identically or differently selected from a single bond, O, S, Se, (CR'R') y , (SiR'R') y , PR', NR', 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; y is selected from 1, 2, 3, 4 or 5 at each occurrence, the same or different; K1-K4 are selected, at each occurrence, identically or differently, from a single bond, O or S; Z1-Z3 are selected from C or N at each occurrence, identically or differently; The compound must meet at least one of the following four conditions: (1) Ring A contains at least two substituents R a , and one of the substituents R a For R X1 , another substituent R a For R X2 ; (2) Ring B has at least two substituents R b , and one of the substituents R b For R X1 , another substituent R b For R X2 ; (3) Ring E contains at least two substituents R e , and one of the substituents R e For R X1 , another substituent R e For R X2 ; (4) Ring D has at least two substituents R d , and one of the substituents R d For R X1 , another substituent R d For R X2 ; The R X1 Having a structure represented by Formula 2: "*" indicates the position where Formula 2 is connected to Formula 1; Y1-Y4 are selected from CR y or N; The R X2 , R y1 Each occurrence is identically or differently selected from the group consisting of substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3 to 20 carbon atoms, and combinations thereof; The substituent R in Formula 1 has a structure represented by Formula 3: In formula 3, Ring F, Ring G and Ring N are identically or differently selected at each occurrence from an unsaturated carbocyclic ring having 5 to 30 carbon atoms, an unsaturated heterocyclic ring having 3 to 30 carbon atoms, or a combination thereof; Z4-Z7 are selected, at each occurrence, identically or differently, from C or N; R a , R b , R d , R e , R f , R g , R n Each occurrence is identical or different, indicating mono-, poly- or unsubstituted; R n1 Each occurrence is identical or different, indicating mono- or poly-substitution; R', R a , R b , R d , R e , R y , R f , R g , R n The group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted an alkynyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted alkylgermanyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylgermanyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof; There is at least one R on the ring N in formula 3 n1 , the R n1 each occurrence is selected, identically or differently, from the group consisting of: deuterium, halogen, substituted or unsubstituted alkyl having 2 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted Alkynyl 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 alkylgermanyl groups having 3 to 20 carbon atoms, substituted or unsubstituted arylgermanyl groups having 6 to 20 carbon atoms, substituted or unsubstituted amino groups having 0 to 20 carbon atoms, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof; The adjacent substituents R', R a , R b , R e , R y , R y1 , R f , R g , R n , R X2 Can optionally be linked to form a ring.

2. The compound of claim 1, wherein the M is selected from Pt or Pd; preferably, the M is selected from Pt.

3. The compound according to claim 1 or 2, wherein the ring A, ring B, ring E, ring F, ring G and ring N are 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 at each occurrence, the same or different; the ring D is selected from an unsaturated heterocyclic ring having 1 to 24 carbon atoms at each occurrence, the same or different; Preferably, each occurrence of Ring A, Ring B, Ring E, Ring F, Ring G and Ring N is identical or different and is 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; each occurrence of Ring D is identical or different and is selected from an unsaturated heterocyclic ring having 1-18 carbon atoms; More preferably, the ring A, ring B, ring E, ring F, ring G and ring N are selected from benzene ring, pyridine ring, indene ring, fluorene ring, indole ring, carbazole ring, benzofuran ring, dibenzofuran ring, benzosilole ring, dibenzosilole ring, benzothiophene ring, dibenzothiophene ring, dibenzoselenophene ring, cyclopentadiene ring, furan ring, thiophene ring, silole ring, or a combination thereof at each occurrence; the ring D is selected from imidazole carbene ring or benzimidazole carbene ring at each occurrence at the same or different times.

4. The compound according to claim 1 or 2, wherein the ring A has at least two substituents R a , and one of the substituents R a For R X1 , another substituent R a For R X2 ; Preferably, the ring A has two substituents R in the ortho position. a , and one of the substituents R a For R X1 , another substituent R a For R X2 ; said R X1 Having a structure represented by Formula 2: "*" indicates the position where Formula 2 is connected to Formula 1; Y1-Y4 are selected from CR y or N; The R y each occurrence being identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, 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 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 arylsilanyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3-20 carbon atoms, substituted or unsubstituted arylgermanyl having 6-20 carbon atoms, and combinations thereof; The R X2 , R y1 Each occurrence is identically or differently selected from the group consisting of substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3 to 20 carbon atoms, and combinations thereof.

5. The compound according to claim 1 or 2, wherein said L1 is selected from a single bond, O, S, (CR'R') y , (SiR'R') y , PR', NR', or a combination thereof; said y is 1 or 2; Preferably, wherein said L1 is selected from a single bond, O or S; More preferably, wherein said L1 is selected from a single bond.

6. The compound of claim 1 or 2, wherein said K1-K4 is selected from a single bond.

7. The compound of claim 1 or 2, wherein Z1 is selected from N, and Z2 and Z3 are selected from C.

8. The compound according to claim 1, wherein the compound has a structure represented by one of Formula 1-1 to Formula 1-8: In Formula 1-1 to Formula 1-8, L2 is selected, at each occurrence, identically or differently, from a single bond, O, S, Se, (CR'R') y , (SiR'R') y , PR', NR', 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; y is selected from 1, 2, 3, 4 or 5 at each occurrence, the same or different; One of X1-X4 is selected from CR X1 , and one selected from CR X2 , and the other two are independently selected from CR x or N; X5-X 16 Each occurrence is the same or different selection from CR x or N; D1-D4 are selected from CR in the same or different way each time they appear. d or N; The R X1 Having a structure represented by Formula 2: "*" indicates the position where Formula 2 is connected with Formulas 1-1 to 1-8; Y1-Y4 are selected from CR y or N; The R X2 , R y1 Each occurrence is identically or differently selected from the group consisting of substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3 to 20 carbon atoms, and combinations thereof; The substituent R has a structure shown in Formula 3-1: In Formula 3-1, F1 to F5 are each independently selected from CR f or N; G1 to G5 are each independently selected from CR g or N; N1 to N3 are each independently selected from CR n1 , CR n or N, and at least one of N1 to N3 is CR n1 ; The R n1 each occurrence is selected, identically or differently, from the group consisting of: deuterium, halogen, substituted or unsubstituted alkyl having 2 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted Alkynyl 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 alkylgermanyl groups having 3 to 20 carbon atoms, substituted or unsubstituted arylgermanyl groups having 6 to 20 carbon atoms, substituted or unsubstituted amino groups having 0 to 20 carbon atoms, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof; The R', R x , R d , R y , R f , R g , R n The group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted an alkynyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted alkylgermanyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylgermanyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof; The adjacent substituents R', R x , R y , R y1 , R x2 , R f , R g , R n can optionally be linked to form a ring; Preferably, the compound has a structure represented by Formula 1-1 or Formula 1-2.

9. The compound according to claim 8, wherein two of X1-X4 at the ortho position are selected from CR X1 and CR X2 , and the other two are independently selected from CR x or N; Preferably, X2 is selected from CR X2 , X3 is selected from CR X1 , X1 and X4 are each independently selected from CR x or N; More preferably, the R x Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, 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.

10. The compound of claim 1 or 8 or 9, wherein R y each occurrence being identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, 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 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 arylsilanyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3-20 carbon atoms, substituted or unsubstituted arylgermanyl having 6-20 carbon atoms, and combinations thereof; Preferably, the R y Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, fluorine, cyano, 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 aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, and combinations thereof.

11. The compound of any one of claims 8 to 10, wherein R X2 , R y1 is selected, identically or differently on each occurrence, from substituted or unsubstituted alkyl having 1 to 20 carbon atoms, or substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms; Preferably, the R X2 , R y1 Each occurrence is identically or differently selected from the group consisting of methyl, partially or fully deuterated methyl, ethyl, partially or fully deuterated ethyl, n-propyl, partially or fully deuterated n-propyl, isopropyl, partially or fully deuterated isopropyl, cyclopropyl, partially or fully deuterated cyclopropyl, n-butyl, partially or fully deuterated n-butyl, isobutyl, partially or fully deuterated isobutyl, tert-butyl, partially or fully deuterated tert-butyl, cyclopentyl, partially or fully deuterated cyclopentyl, cyclohexyl, partially or fully deuterated cyclohexyl, and combinations thereof.

12. The compound of any one of claims 8 to 11, wherein N1 and N3 are each independently selected from CR n , N2 is selected from CR n1 , and the R n Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, substituted or unsubstituted alkyl having 2 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; said R n1 each occurrence is identically or differently selected from the group consisting of: deuterium, halogen, cyano, substituted or unsubstituted alkyl having 2-20 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 alkylgermanyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, and combinations thereof; Preferably, the R n Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, fluorine, cyano, substituted or unsubstituted alkyl having 2 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, and combinations thereof; said R n1 each occurrence is identically or differently selected from the group consisting of: deuterium, fluorine, cyano, substituted or unsubstituted alkyl having 2-7 carbon atoms, substituted or unsubstituted cycloalkyl having 3-8 ring carbon atoms, substituted or unsubstituted aryl having 6-12 carbon atoms, substituted or unsubstituted heteroaryl having 3-12 carbon atoms, substituted or unsubstituted alkylsilyl having 3-6 carbon atoms, substituted or unsubstituted alkylgermanyl having 3-6 carbon atoms, and combinations thereof; More preferably, the R n Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, fluorine, methyl, deuterated methyl, ethyl, n-propyl, isopropyl, cyclopropyl, n-butyl, isobutyl, tert-butyl, cyclopentyl, cyclohexyl, phenyl, trimethylsilyl, carbazolyl, indolyl, benzofuranyl, dibenzofuranyl, benzothioyl, dibenzothioyl, benzothiophenyl, dibenzothiophenyl, dibenzoselenophene, and combinations thereof; said R n1 Each occurrence is identically or differently selected from the group consisting of ethyl, partially or fully deuterated ethyl, n-propyl, partially or fully deuterated n-propyl, isopropyl, partially or fully deuterated isopropyl, cyclopropyl, partially or fully deuterated cyclopropyl, n-butyl, partially or fully deuterated n-butyl, isobutyl, partially or fully deuterated isobutyl, tert-butyl, partially or fully deuterated tert-butyl, cyclopentyl, partially or fully deuterated cyclopentyl, cyclohexyl, partially or fully deuterated cyclohexyl, and combinations thereof.

13. The compound according to any one of claims 8 to 12, wherein each of F1 to F5 is independently selected from CR f ; G1 to G5 are each independently selected from CR g ; said R f , R g each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, 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; Preferably, the R f , R g Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, fluorine, methyl, deuterated methyl, ethyl, n-propyl, isopropyl, cyclopropyl, n-butyl, isobutyl, tert-butyl, cyclopentyl, cyclohexyl, phenyl, trimethylsilyl, carbazolyl, indolyl, benzofuranyl, dibenzofuranyl, benzothiolaryl, dibenzothiolaryl, benzothiophenyl, dibenzothiophenyl, dibenzoselenophene, and combinations thereof.

14. The compound of claim 1 or 8, wherein the substituent R is selected from the group consisting of An-1 to An-79 at each occurrence, the same or different: in, Optionally, hydrogen in the structures An-1 to An-79 can be partially or fully replaced by deuterium.

15. The compound of claim 1 or 8, wherein each occurrence of L2 is identically or differently selected from a single bond, O, S, (CR'R') y , (SiR'R') y , PR', NR', and combinations thereof; said y is 1 or 2; Preferably, each occurrence of L2 is identically or differently selected from a single bond, O or S; More preferably, L2 is selected from O.

16. The compound of claim 1, wherein the compound has Pt(L a )(L b ) represents a structure where L a and L b are the first ligand and the second ligand coordinated with the metal Pt, respectively. a Choose from L a 1-1 to L a 1-62, L a 2-1 to L a 2-25, L a 3-1 to L a 3-18, and L a 4-1 to L a Group consisting of 4-41: The L a "tBu" in the structure represents tert-butyl; The L a The "#" in the structure indicates that the structure is consistent with L b The location of the connection; Among them, ligand L b Choose from L b 1-1 to L b 1-16, L b 2-1 to L b 2-17, L b 3-1 to L b 3-23, L b 4-1 to L b 4-25, L b 5-1 to L b 5-20, and L b 6-1 to L b Group consisting of 6-17: The L b "TMS" in the structure stands for trimethylsilyl; The L b In the structure Indicates that the structure and L a The position of the "#" connection in the Preferably, the compound is selected from the group consisting of compound Pt1 to compound Pt528; Wherein, the compounds Pt1 to Pt528 have Pt(L a )(L b ) represents a structure, wherein L a and the L b The corresponding structures are selected from the following table: 。 17. An organic electroluminescent device, comprising: anode, cathode, and an organic layer disposed between the anode and the cathode, wherein the organic layer comprises the compound according to any one of claims 1 to 16.

18. The organic electroluminescent device according to claim 17, wherein the organic layer is a light-emitting layer, and the compound is a light-emitting material.

19. The organic electroluminescent device according to claim 18, wherein the maximum emission wavelength of the device is less than or equal to 475 nm.

20. The organic electroluminescent device of claim 18, wherein the light-emitting layer comprises at least one host material; preferably, the light-emitting layer comprises at least two host materials; more preferably, the host material comprises at least one chemical group selected from the group consisting of benzene, pyridine, pyrimidine, triazine, carbazole, azacarbazole, indolecarbazole, dibenzothiophene, azadibenzothiophene, dibenzofuran, azadibenzofuran, dibenzoselenophene, triphenylene, azatriphenylene, fluorene, silylate, naphthalene, quinoline, isoquinoline, quinazoline, quinoxaline, phenanthrene, azaphenanthrene, and combinations thereof.

21. A compound composition comprising the compound of any one of claims 1-16.

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