Organic electroluminescent device and display device

Abstract

Disclosed are an organic electroluminescent device and a display device. The organic electroluminescent device includes an anode, a cathode, and a light-emitting layer disposed between the anode and the cathode, the light-emitting layer including a fluorescent light-emitting material represented by a structure of Formula 1, a metal complex, a first host compound, and a second host compound. The organic light-emitting device shows excellent comprehensive device performance, for example, narrow half-peak width, high current efficiency, very excellent device service life and the like can be obtained. Also disclosed are a display device comprising the organic electroluminescent device, and a composition comprising the fluorescent light-emitting material, a metal complex, a first host compound, and a second host compound.

Description

Technical Field

[0001] The present invention relates to an organic electronic device, such as an organic electroluminescent device, and more particularly to an organic electroluminescent device comprising a specific combination of four materials in a light-emitting layer and a display device comprising the organic electroluminescent device. 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 photovoltaics (OPVs), dye-sensitized solar cells (DSSCs), organic photodetectors, organic photoreceptors, organic field-effect devices (OFQDs), light-emitting electrochemical cells (LECs), organic laser diodes, and organic plasmonic light-emitting devices.

[0003] In 1987, Tang and Van Slyke of Eastman Kodak reported a double-layer organic electroluminescent device that included an arylamine hole transport layer and a tris-8-hydroxyquinoline-aluminum layer as an electron transport layer and a light-emitting layer (Applied Physics Letters, 1987, 51(12):913-915). Once a bias voltage was applied to the device, green light was 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 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 categorized into three different types based on their emission mechanism. The OLED invented by Tang and van Slyke is a fluorescent OLED. It uses only singlet emission. Triplet states generated in the device are wasted through non-radiative decay channels. As a result, 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 use triplet emission from heavy metal complexes as the emitter. This allows for the harvesting of both singlet and triplet states, achieving an IQE of 100%. Due to its high efficiency, the discovery and development of phosphorescent OLEDs directly contributed to the commercialization of active-matrix OLEDs (AMOLEDs). More recently, Adachi achieved high efficiency through thermally activated delayed fluorescence (TADF) of organic compounds. These emitters have a small singlet-triplet gap, enabling excitons to return from the triplet state to the singlet state. In TADF devices, triplet excitons can generate singlet excitons through reverse intersystem crossing, resulting in high IQE.

[0005] OLEDs can also be categorized based on the form of the materials used, into small molecule and polymer OLEDs. A small molecule is any organic or organometallic material that is not a polymer. Small molecules can have large molecular weights as long as they have a precise structure. Dendrimers, with their well-defined structure, 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] Various OLED manufacturing methods exist. Small molecule OLEDs are typically produced by vacuum thermal evaporation (evaporation). Polymer OLEDs are produced using solution methods such as spin coating, inkjet printing, and nozzle printing. Small molecule OLEDs can also be produced using solution methods if the material can be dissolved or dispersed in a solvent.

[0007] The luminescent color of OLEDs can be achieved through the structural design of luminescent materials. OLEDs can include one or more 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 generally adopt a hybrid strategy, using blue fluorescence and phosphorescent yellow, or red and green. Currently, the efficiency of phosphorescent OLEDs decreases rapidly under high brightness conditions, which remains a problem. In addition, it is expected to have a more saturated luminescent spectrum, higher efficiency, and longer device life.

[0008] US20230200206A1 discloses a fused ring compound having the general formula 1: where X11 Is -O-, -S-, -Se-, -Te-, -NR X11 - or single bond, Y 11 and Y 12 are independently -O-, -S-, -Se-, -Te-, -NR Y11 -、-CR Y12 R Y13 -or-SiR Y14 R Y15 -. The application discloses in detail the structure Compounds such as As a phosphorescence sensitizer, use As a luminescent material, it can be seen that the application discloses compounds having a specific fused ring structure of general formula 1 and their application in organic electroluminescent devices, and does not disclose or teach compounds with other skeleton structures and their application in organic electroluminescent devices.

[0009] Prior art discloses devices that utilize metal complexes as phosphorescent sensitizers in the light-emitting layer to desensitize fluorescent materials. The presence of these phosphorescent sensitizers effectively suppresses the high roll-off of delayed fluorescent materials, thereby improving device performance at high brightness. However, the performance of these devices still requires improvement, such as higher device efficiency and longer lifespan. Summary of the Invention

[0010] The present invention provides a novel organic electroluminescent device that addresses at least some of the aforementioned issues. The light-emitting layer of the organic electroluminescent device comprises a fluorescent material represented by Formula 1, a metal complex, a first host compound, and a second host compound. This novel organic electroluminescent device exhibits excellent overall device performance, such as a narrow half-width (FWHM), high current efficiency, and a very long device life.

[0011] According to one embodiment of the present invention, an organic electroluminescent device is disclosed, comprising:

[0012] anode,

[0013] cathode,

[0014] and a light-emitting layer disposed between the anode and the cathode, wherein the light-emitting layer comprises a fluorescent light-emitting material, a metal complex, a first host compound and a second host compound;

[0015] The fluorescent light-emitting material has a structure represented by Formula 1:

[0016]

[0017] In formula 1,

[0018] Ring A is selected from an unsaturated carbocyclic ring having 5 to 30 carbon atoms or an unsaturated heterocyclic ring having 4 to 30 carbon atoms;

[0019] Ring B, Ring C, Ring D, and Ring E are each independently selected from an unsaturated carbocyclic ring having 5 to 30 carbon atoms or an unsaturated heterocyclic ring having 3 to 30 carbon atoms;

[0020] Y1 is selected from B, P=O, P=S, As, As=O, As=S, SiR' or GeR';

[0021] R a1 , R a2 , R a3 , R a4 , R a5 Each occurrence of the same or different means mono-, poly- or no-substitution;

[0022] R', R a1 , R a2 , R a3 , R a4 , R a5 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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;

[0023] L1, L2 are each independently selected from the group consisting of: single bond, O, S, Se, SiR L1 R L1 , PR L1 , R L1 C=CR L1, a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 30 carbon atoms, and combinations thereof;

[0024] R L1 each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclyl having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, and combinations thereof;

[0025] Adjacent substituent R a1 can optionally be linked to form a ring;

[0026] Adjacent substituent R a2 can optionally be linked to form a ring;

[0027] Adjacent substituent R a3 can optionally be linked to form a ring;

[0028] Adjacent substituent R a4 can optionally be linked to form a ring;

[0029] Adjacent substituent R a5 can optionally be linked to form a ring;

[0030] Adjacent substituent R L1 Can optionally be linked to form a ring.

[0031] According to one embodiment of the present invention, a display device is disclosed, which includes the organic electroluminescent device described in the above embodiment.

[0032] According to one embodiment of the present invention, a composition is disclosed, comprising a fluorescent luminescent material, a metal complex, a first host compound and a second host compound;

[0033] The fluorescent light-emitting material has a structure represented by Formula 1:

[0034]

[0035] In formula 1,

[0036] Ring A is selected from an unsaturated carbocyclic ring having 5 to 30 carbon atoms or an unsaturated heterocyclic ring having 4 to 30 carbon atoms;

[0037] Ring B, Ring C, Ring D, and Ring E are each independently selected from an unsaturated carbocyclic ring having 5 to 30 carbon atoms or an unsaturated heterocyclic ring having 3 to 30 carbon atoms;

[0038] Y1 is selected from B, P=O, P=S, As, As=O, As=S, SiR' or GeR';

[0039] R a1 , R a2 , R a3 , R a4 , R a5 Each occurrence of the same or different means mono-, poly- or no-substitution;

[0040] R', R a1 , R a2 , R a3 , R a4 , R a5 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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;

[0041] L1, L2 are each independently selected from the group consisting of: single bond, O, S, Se, SiR L1 R L1 , PR L1 , R L1 C=CR L1 , a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 30 carbon atoms, and combinations thereof;

[0042] R L1each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclyl having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, and combinations thereof;

[0043] Adjacent substituent R a1 can optionally be linked to form a ring;

[0044] Adjacent substituent R a2 can optionally be linked to form a ring;

[0045] Adjacent substituent R a3 can optionally be linked to form a ring;

[0046] Adjacent substituent R a4 can optionally be linked to form a ring;

[0047] Adjacent substituent R a5 can optionally be linked to form a ring;

[0048] Adjacent substituent R L1 Can optionally be linked to form a ring.

[0049] The present invention provides a novel organic electroluminescent device. The light-emitting layer of the organic electroluminescent device comprises a fluorescent material represented by Formula 1, a metal complex, a first host compound, and a second host compound. This novel organic electroluminescent device exhibits excellent overall device performance, such as a narrow half-width, high current efficiency, and a very long device life. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 is a schematic diagram of an organic light-emitting device that may contain the organic electroluminescent device disclosed herein.

[0051] Figure 2 is a schematic diagram of another organic light-emitting device that may contain the organic electroluminescent device disclosed herein. DETAILED DESCRIPTION

[0052] OLEDs can be manufactured on a variety of substrates, such as glass, plastic, and metal. Figure 1An 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.

[0053] There are many more examples of each of these layers. For example, a flexible and transparent substrate-anode combination is disclosed in U.S. Patent No. 5,844,363, which is incorporated by reference in its entirety. An example of a p-doped hole transport layer is m-MTDATA doped with F4-TCNQ at a molar ratio of 50:1, as disclosed in U.S. Patent Application Publication No. 2003 / 0230980, which is incorporated by reference in its entirety. An example of a host material is disclosed in U.S. Patent No. 6,303,238 to Thompson et al., which is incorporated by reference in its entirety. An example of an n-doped electron transport layer is BPhen doped with Li at a molar ratio of 1:1, as disclosed in U.S. Patent Application Publication No. 2003 / 0230980, which is incorporated by reference in its entirety. U.S. Patent Nos. 5,703,436 and 5,707,745, incorporated by reference in their entireties, disclose examples of cathodes including composite cathodes having a thin layer of a metal such as Mg:Ag with an overlying transparent, conductive, sputter-deposited ITO layer. The principles and use of barrier layers are described in more detail in U.S. Patent No. 6,097,147 and U.S. Patent Application Publication No. 2003 / 0230980, incorporated by reference in their entireties. An example of an injection layer is provided in U.S. Patent Application Publication No. 2004 / 0174116, incorporated by reference in its entirety. A description of protective layers can be found in U.S. Patent Application Publication No. 2004 / 0174116, incorporated by reference in its entirety.

[0054] The above layered structures are provided by way of non-limiting examples. The functionality 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 emission spectrum.

[0055] In one embodiment, an OLED can be described as having an "organic layer" disposed between a cathode and an anode. The organic layer can include one or more layers.

[0056] OLED also requires encapsulation layers, such as Figure 2 The organic light emitting device 200 is shown schematically and non-limitingly. Figure 1 The difference is that an encapsulation layer 102 can also be included above 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 the encapsulation layer, such as glass or an organic-inorganic hybrid layer. The encapsulation layer should be placed directly or indirectly on the outside of the OLED device. Multilayer thin-film encapsulation is described in U.S. Patent No. 7,968,146 B2, the entire contents of which are incorporated herein by reference.

[0057] 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, smartphones, tablet computers, tablet phones, wearable devices, smart watches, laptop computers, digital cameras, camcorders, viewfinders, microdisplays, 3-D displays, vehicle displays, and taillights.

[0058] The materials and structures described herein can also be used in other organic electronic devices listed above.

[0059] As used herein, "top" means farthest from the substrate, while "bottom" means closest to the substrate. When 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, the cathode may be described as being "disposed on" the anode even if various organic layers are present between the cathode and the anode.

[0060] 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.

[0061] A ligand may be referred to as "photoactive" when it is believed that the ligand directly contributes to the photoactive properties of the emissive material. A ligand may be referred to as "ancillary" when it is not believed to contribute to the photoactive properties of the emissive material, but the ancillary ligand may modify the properties of the photoactive ligand.

[0062] 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).

[0063] On the other hand, E-type delayed fluorescence does not rely on the collision of two triplets, but relies 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 so as to convert 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 the triplet, the fraction of backfilling the singlet excited state may reach 75%. The total singlet fraction can be 100%, far exceeding the 25% of the spin statistics of the electrically generated excitons.

[0064] 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-metallic 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. Typically, 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).

[0065] Definition of Substituent Terms

[0066] Halogen or halide - as used herein, includes fluorine, chlorine, bromine and iodine.

[0067] Alkyl - as used herein, includes straight chain and branched chain alkyl groups. The alkyl group may be an alkyl group having 1 to 20 carbon atoms, preferably an alkyl group having 1 to 12 carbon atoms, 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.

[0068] Cycloalkyl - as used herein, includes cyclic alkyl groups. Cycloalkyl groups can be cycloalkyl groups having 3 to 20 ring carbon atoms, preferably cycloalkyl groups having 4 to 10 carbon atoms. Examples of cycloalkyl groups include cyclobutyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4,4-dimethylcyclohexyl, 1-adamantyl, 2-adamantyl, 1-norbornyl, 2-norbornyl, and the like. Of the above, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, and 4,4-dimethylcyclohexyl are preferred. In addition, the cycloalkyl group may be optionally substituted.

[0069] Heteroalkyl - As used herein, a heteroalkyl group comprises one or more carbon atoms in the alkyl chain substituted with a heteroatom selected from the group consisting of nitrogen, oxygen, sulfur, selenium, phosphorus, silicon, germanium, and boron atoms. The heteroalkyl group may be a heteroalkyl group having 1 to 20 carbon atoms, preferably a heteroalkyl group having 1 to 10 carbon atoms, and more preferably a heteroalkyl group having 1 to 6 carbon atoms. The example of heteroalkyl includes 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 can be optionally substituted.

[0070] Alkenyl - as used herein, encompasses straight chain, branched chain, and cyclic olefin groups. Alkenyl groups can be alkenyl groups containing 2 to 20 carbon atoms, preferably alkenyl groups having 2 to 10 carbon atoms. Examples of alkenyl groups include ethenyl, propenyl, 1-butenyl, 2-butenyl, 3-butenyl, 1,3-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 can be optionally substituted.

[0071] Alkynyl - as used herein, encompasses straight chain alkynyl groups. Alkynyl groups can be alkynyl groups comprising 2 to 20 carbon atoms, preferably alkynyl groups having 2 to 10 carbon atoms. Examples of alkynyl groups include ethynyl, propynyl, propargyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-pentynyl, 2-pentynyl, 3,3-dimethyl-1-butynyl, 3-ethyl-3-methyl-1-pentynyl, 3,3-diisopropyl-1-pentynyl, phenylethynyl, phenylpropynyl, etc. Among the above, ethynyl, propynyl, propargyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-pentynyl, phenylethynyl, etc. are preferred. In addition, alkynyl groups can be optionally substituted.

[0072] Aryl or aromatic group - As used herein, both non-fused and fused systems are contemplated. The aryl group can be an aryl group having 6 to 30 carbon atoms, preferably an aryl group having 6 to 20 carbon atoms, and more preferably an aryl group having 6 to 12 carbon atoms. Examples of aryl groups include phenyl, biphenyl, terphenyl, triphenylene, tetraphenylene, naphthalene, anthracene, phenanthren, fluorene, pyrene, Perylene and azulene, preferably phenyl, biphenyl, terphenyl, triphenylene, fluorene and naphthalene. Examples of non-fused aryl groups include phenyl, biphenyl-2-yl, biphenyl-3-yl, biphenyl-4-yl, p-terphenyl-4-yl, p-terphenyl-3-yl, p-terphenyl-2-yl, m-terphenyl-4-yl, m-terphenyl-3-yl, m-terphenyl-2-yl, o-tolyl, m-tolyl, p-tolyl, p-(2-phenylpropyl)phenyl, 4'-methylbiphenyl, 4"-tert-butyl-p-terphenyl-4-yl, o-cumyl, m-cumyl, p-cumyl, 2,3-xylyl, 3,4-xylyl, 2,5-xylyl, mesityl and m-quaterphenyl. In addition, the aryl group may be optionally substituted.

[0073] Heterocyclic group - as used herein, non-aromatic cyclic groups are contemplated. Non-aromatic heterocyclic groups include saturated heterocyclic groups having 3-20 ring atoms and unsaturated non-aromatic heterocyclic groups having 3-20 ring atoms, wherein at least one ring atom is selected from the group consisting of nitrogen atoms, oxygen atoms, sulfur atoms, selenium atoms, silicon atoms, phosphorus atoms, germanium atoms and boron atoms, and preferred non-aromatic heterocyclic groups are those having 3 to 7 ring atoms, including at least one heteroatom such as nitrogen, oxygen, silicon or sulfur. Examples of non-aromatic heterocyclic groups include oxiranyl, oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, dioxopentanyl, dioxanyl, aziridinyl, dihydropyrrolyl, tetrahydropyrrolyl, piperidinyl, oxazolidinyl, morpholinyl, piperazinyl, oxepinyl, thiepinyl, azepine and tetrahydrothioxyl. In addition, the heterocyclic group may be optionally substituted.

[0074] Heteroaryl - As used herein, non-fused and fused heteroaromatic groups may contain from 1 to 5 heteroatoms, at least one of which is selected from the group consisting of nitrogen, oxygen, sulfur, selenium, silicon, phosphorus, germanium, and boron. Heteroaryl also refers to heteroaryl. The heteroaryl group may have from 3 to 30 carbon atoms, preferably from 3 to 20 carbon atoms, and more preferably from 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, indazine, benzoxazole, benzisoxazole, benzothiazole, quinoline, isoquinoline, In some embodiments, the heteroaryl group comprises an oxadiazole, an isocyanine ...

[0075] Alkoxy - as used herein, is represented by -O-alkyl, -O-cycloalkyl, -O-heteroalkyl, or -O-heterocyclyl. Examples and preferred examples of alkyl, cycloalkyl, heteroalkyl, and heterocyclyl are the same as those described above. The alkoxy group may be an alkoxy group having 1 to 20 carbon atoms, preferably an alkoxy group having 1 to 6 carbon atoms. Examples of alkoxy groups include methoxy, ethoxy, propoxy, butoxy, pentyloxy, hexyloxy, cyclopropyloxy, cyclobutyloxy, cyclopentyloxy, cyclohexyloxy, tetrahydrofuranyloxy, tetrahydropyranyloxy, methoxypropyloxy, ethoxyethyloxy, methoxymethyloxy, and ethoxymethyloxy. In addition, the alkoxy group may be optionally substituted.

[0076] Aryloxy - As used herein, it is represented by -O-aryl or -O-heteroaryl. Examples and preferred examples of aryl and heteroaryl groups are the same as those described above. The aryloxy group may be an aryloxy group having 6 to 30 carbon atoms, preferably an aryloxy group having 6 to 20 carbon atoms. Examples of the aryloxy group include phenoxy and biphenyloxy. In addition, the aryloxy group may be optionally substituted.

[0077] Aralkyl - as used herein, encompasses aryl-substituted alkyl groups. The aralkyl group may be an aralkyl group having 7 to 30 carbon atoms, preferably an aralkyl group having 7 to 20 carbon atoms, and more preferably an aralkyl group 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.Alkyl group can be substituted alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl, alkyl,

[0078] Alkylsilyl - As used herein, encompasses alkyl-substituted silicon groups. The alkylsilyl group may be an alkylsilyl group having 3 to 20 carbon atoms, preferably an alkylsilyl group having 3 to 10 carbon atoms. Examples of alkylsilyl groups include trimethylsilyl, triethylsilyl, methyldiethylsilyl, ethyldimethylsilyl, tripropylsilyl, tributylsilyl, triisopropylsilyl, methyldiisopropylsilyl, dimethylisopropylsilyl, tri-tert-butylsilyl, triisobutylsilyl, dimethyl-tert-butylsilyl, and methyldi-tert-butylsilyl. Additionally, the alkylsilyl group may be optionally substituted.

[0079] Arylsilyl - As used herein, encompasses silicon groups substituted with at least one aryl group. The arylsilyl group may be one having 6 to 30 carbon atoms, preferably one having 8 to 20 carbon atoms. Examples of arylsilyl groups include triphenylsilyl, phenyldibiphenylsilyl, diphenylbiphenylsilyl, phenyldiethylsilyl, diphenylethylsilyl, phenyldimethylsilyl, diphenylmethylsilyl, phenyldiisopropylsilyl, diphenylisopropylsilyl, diphenylbutylsilyl, diphenylisobutylsilyl, and diphenyltert-butylsilyl. Additionally, the arylsilyl group may be optionally substituted.

[0080] Alkylgermanyl - As used herein, alkyl-substituted germanium groups are encompassed. The alkylgermanyl group can be an alkylgermanyl group having 3 to 20 carbon atoms, preferably an alkylgermanyl group having 3 to 10 carbon atoms. Examples of alkylgermanyl groups include trimethylgermanyl, triethylgermanyl, methyldiethylgermanyl, ethyldimethylgermanyl, tripropylgermanyl, tributylgermanyl, triisopropylgermanyl, methyldiisopropylgermanyl, dimethylisopropylgermanyl, tri-tert-butylgermanyl, triisobutylgermanyl, dimethyl-tert-butylgermanyl, and methyldi-tert-butylgermanyl. Additionally, the alkylgermanyl group can be optionally substituted.

[0081] Arylgermanyl - As used herein, encompasses germanium groups substituted with at least one aryl or heteroaryl group. The arylgermanyl group may be one having 6 to 30 carbon atoms, preferably one having 8 to 20 carbon atoms. Examples of arylgermanyl groups include triphenylgermanyl, phenyldibiphenylgermanyl, diphenylbiphenylgermanyl, phenyldiethylgermanyl, diphenylethylgermanyl, phenyldimethylgermanyl, diphenylmethylgermanyl, phenyldiisopropylgermanyl, diphenylisopropylgermanyl, diphenylbutylgermanyl, diphenylisobutylgermanyl, and diphenyltert-butylgermanyl. Additionally, the arylgermanyl group may be optionally substituted.

[0082] The term "aza" in azadibenzofuran, azadibenzothiophene, etc., means that one or more CH groups in the corresponding aromatic moiety 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 nitrogen atoms in the ring system. Other nitrogen analogs of the above-mentioned aza derivatives will readily occur to one of ordinary skill in the art, and all such analogs are intended to be included within the terminology described herein.

[0083] In the present disclosure, unless otherwise defined, when any one term 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 groups having 3 to 20 ring carbon atoms, unsubstituted heteroalkyl groups having 1 to 20 ring carbon atoms, unsubstituted heterocyclyl groups having 3 to 20 ring carbon atoms, unsubstituted aralkyl groups having 7 to 30 carbon atoms, unsubstituted alkoxy groups having 1 to 20 carbon atoms, unsubstituted aryloxy groups having 6 to 30 carbon atoms, unsubstituted alkenyl groups having 2 to 20 carbon atoms, unsubstituted alkynyl groups having 2 to 20 carbon atoms, unsubstituted aryl groups having 6 to 30 carbon atoms , unsubstituted heteroaryl having 3 to 30 carbon atoms, unsubstituted alkylsilyl having 3 to 20 carbon atoms, unsubstituted arylsilyl having 6 to 20 carbon atoms, unsubstituted 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.

[0084] 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 an entire molecule (e.g., benzene, naphthalene, dibenzofuran). As used herein, these different ways of designating a substituent or attaching a fragment are considered equivalent.

[0085] In the compounds described herein, 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 compounds may be preferred because it enhances device efficiency and stability.

[0086] In the compounds described herein, polysubstitution refers to a range including disubstitution up to the maximum number of available substitutions. When a substituent in a compound described herein represents polysubstitution (including disubstitution, trisubstitution, tetrasubstitution, etc.), it means that the substituent can be present at multiple available substitution positions on its connected structure, and the substituents present at multiple available substitution positions can have the same structure or different structures.

[0087] In the compounds mentioned in the present disclosure, unless clearly defined, such as 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 the situation where adjacent substituents can be connected to form a ring, and also including 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.

[0088] The statement that adjacent substituents can optionally be 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, as can be exemplified by the following formula:

[0089]

[0090] The statement that adjacent substituents can optionally be 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 via a chemical bond to form a ring, as can be exemplified by the following formula:

[0091]

[0092] The statement that adjacent substituents can optionally be linked to form a ring is also intended to be taken to mean that two substituents bonded to further distant carbon atoms are linked to each other by a chemical bond to form a ring, as can be exemplified by the following formula:

[0093]

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

[0095]

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

[0097] anode,

[0098] cathode,

[0099] and a light-emitting layer disposed between the anode and the cathode, wherein the light-emitting layer comprises a fluorescent light-emitting material, a metal complex, a first host compound and a second host compound;

[0100] The fluorescent light-emitting material has a structure represented by Formula 1:

[0101]

[0102] In formula 1,

[0103] Ring A is selected from an unsaturated carbocyclic ring having 5 to 30 carbon atoms or an unsaturated heterocyclic ring having 4 to 30 carbon atoms;

[0104] Ring B, Ring C, Ring D, and Ring E are each independently selected from an unsaturated carbocyclic ring having 5 to 30 carbon atoms or an unsaturated heterocyclic ring having 3 to 30 carbon atoms;

[0105] Y1 is selected from B, P=O, P=S, As, As=O, As=S, SiR' or GeR';

[0106] R a1 , R a2 , R a3 , R a4 , R a5 Each occurrence of the same or different means mono-, poly- or no-substitution;

[0107] R', R a1 , R a2 , R a3 , R a4 , R a5Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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;

[0108] L1, L2 are each independently selected from the group consisting of: single bond, O, S, Se, SiR L1 R L1 , PR L1 , R L1 C=CR L1 , a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 30 carbon atoms, and combinations thereof;

[0109] R L1 each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclyl having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, and combinations thereof;

[0110] Adjacent substituent R a1 can optionally be linked to form a ring;

[0111] Adjacent substituent R a2 can optionally be linked to form a ring;

[0112] Adjacent substituent R a3can optionally be linked to form a ring;

[0113] Adjacent substituent R a4 can optionally be linked to form a ring;

[0114] Adjacent substituent R a5 can optionally be linked to form a ring;

[0115] Adjacent substituent R L1 Can optionally be linked to form a ring.

[0116] In this context, “the adjacent substituent R a1 can optionally be linked to form a ring” is intended to mean that two adjacent substituents R a1 Obviously, two adjacent substituents R a1 They may not be connected to form a ring.

[0117] In this context, “the adjacent substituent R a2 can optionally be linked to form a ring” is intended to mean that two adjacent substituents R a2 Obviously, two adjacent substituents R a2 They may not be connected to form a ring.

[0118] In this context, “the adjacent substituent R a3 can optionally be linked to form a ring” is intended to mean that two adjacent substituents R a3 Obviously, two adjacent substituents R a3 They may not be connected to form a ring.

[0119] In this context, “the adjacent substituent R a4 can optionally be linked to form a ring” is intended to mean that two adjacent substituents R a4 Obviously, two adjacent substituents R a4 They may not be connected to form a ring.

[0120] In this context, “the adjacent substituent R a5 can optionally be linked to form a ring” is intended to mean that two adjacent substituents R a5 Obviously, two adjacent substituents R a5 They may not be connected to form a ring.

[0121] In this context, “the adjacent substituent R L1 can optionally be linked to form a ring” is intended to mean that two adjacent substituents R L1 Obviously, two adjacent substituents R L1They may not be connected to form a ring.

[0122] Herein, the "unsaturated carbocycle" includes an aromatic unsaturated carbocycle (aromatic ring) and a non-aromatic unsaturated carbocycle, and the "unsaturated heterocycle" includes an aromatic unsaturated heterocycle (heteroaromatic ring) and a non-aromatic unsaturated heterocycle.

[0123] According to one embodiment of the present invention, the light-emitting layer in the device is formed by placing four materials, namely, a fluorescent light-emitting material, a metal complex, a first host compound, and a second host compound, in four evaporation sources for co-evaporation.

[0124] According to one embodiment of the present invention, the light-emitting layer in the device is not formed by placing a pre-mixture of the fluorescent light-emitting material, the first host compound and the second host compound in one evaporation source and placing the metal complex in another evaporation source for co-evaporation.

[0125] According to one embodiment of the present invention, the ring A, ring B, ring C, ring D and ring E are each independently selected from a five-membered unsaturated carbocyclic ring, an aromatic ring having 6-30 carbon atoms or a heteroaromatic ring having 4-30 carbon atoms.

[0126] According to one embodiment of the present invention, wherein the ring A, ring B, ring C, ring D and ring E are the same or different when they appear each time and are selected from a five-membered unsaturated carbocyclic ring, an aromatic ring having 6-18 carbon atoms or a heteroaromatic ring having 4-18 carbon atoms.

[0127] According to one embodiment of the present invention, the ring A, ring B, ring C, ring D and ring E are selected from benzene ring, pyridine ring, naphthalene ring, phenanthrene ring, anthracene 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.

[0128] According to one embodiment of the present invention, the ring A, ring B, ring C, ring D and ring E are selected from benzene rings.

[0129] According to one embodiment of the present invention, the Y1 is independently selected from B, P=O or P=S.

[0130] According to one embodiment of the present invention, the Y1 is selected from B.

[0131] According to one embodiment of the present invention, the fluorescent light-emitting material contains only one B atom.

[0132] According to one embodiment of the present invention, the compound of formula 1 contains only one B atom.

[0133] According to one embodiment of the present invention, the compound of formula 1-1 contains only one B atom.

[0134] According to one embodiment of the present invention, the fluorescent light-emitting material has a structure represented by Formula 1-1:

[0135]

[0136] in,

[0137] R a1 , R a2 , R a3 , R a4 , R a5 Each occurrence of the same or different means mono-, poly- or no-substitution;

[0138] R a1 , R a2 , R a3 , R a4 , R a5 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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;

[0139] L1, L2 are each independently selected from the group consisting of: single bond, O, S, Se, SiR L1 R L1 , PR L1 , R L1 C=CR L1, a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 30 carbon atoms, and combinations thereof;

[0140] R L1 each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclyl having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, and combinations thereof;

[0141] Adjacent substituent R a1 can optionally be linked to form a ring;

[0142] Adjacent substituent R a2 can optionally be linked to form a ring;

[0143] Adjacent substituent R a3 can optionally be linked to form a ring;

[0144] Adjacent substituent R a4 can optionally be linked to form a ring;

[0145] Adjacent substituent R a5 can optionally be linked to form a ring;

[0146] Adjacent substituent R L1 Can optionally be linked to form a ring.

[0147] According to one embodiment of the present invention, L1 and L2 are each independently selected from a single bond, O or S.

[0148] According to one embodiment of the present invention, at least one of L1 and L2 is a single bond.

[0149] According to one embodiment of the present invention, L1 and L2 are single bonds.

[0150] According to one embodiment of the present invention, wherein the R a1 , R a2 , R a3 , R a4 , R a5Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclyl having 3-20 ring atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3-20 carbon atoms, substituted or unsubstituted arylgermanyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, and combinations thereof.

[0151] According to one embodiment of the present invention, wherein the R a1 , R a2 , R a3 , R a4 , R a5 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl having 1-6 carbon atoms, substituted or unsubstituted cycloalkyl having 3-6 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-6 carbon atoms, substituted or unsubstituted heterocyclyl having 3-6 ring atoms, substituted or unsubstituted aryl having 6-24 carbon atoms, substituted or unsubstituted heteroaryl having 3-12 carbon atoms, substituted or unsubstituted alkylsilyl having 3-6 carbon atoms, substituted or unsubstituted arylsilyl having 6-12 carbon atoms, substituted or unsubstituted alkylgermanyl having 3-6 carbon atoms, substituted or unsubstituted arylgermanyl having 6-12 carbon atoms, substituted or unsubstituted amino having 0-12 carbon atoms, and combinations thereof.

[0152] According to one embodiment of the present invention, wherein the R a1 , R a2 , R a3 , R a4 , R a5Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, fluorine, cyano, hydroxyl, mercapto, methyl, ethyl, n-propyl, isopropyl, cyclopropyl, n-butyl, isobutyl, tert-butyl, cyclopentyl, neopentyl, cyclohexyl, trimethylsilyl, trimethylgermanyl, phenyl, biphenyl, terphenyl, quaterphenyl, triphenylene, tetraphenylene, naphthyl, phenanthrenyl, anthracenyl, indenyl, fluorenyl, indolyl, carbazolyl, benzofuranyl, dibenzofuranyl, benzothiazolyl, dibenzothiazolyl, benzothiophene, dibenzothiophene, dibenzoselenophene, diphenylamino, dibenzofuranylphenylamino, and combinations thereof.

[0153] According to one embodiment of the present invention, wherein the R a1 , R a2 , R a3 , R a4 , R a5 At least one of the following is selected, at each occurrence, identically or differently, from the group consisting of: deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted 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 alkyl having 2 to 20 carbon atoms the alkenyl group, 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.

[0154] According to one embodiment of the present invention, wherein the R a1 , R a2 , R a3 , R a4 , R a5At least one of the following groups is selected, at each occurrence, identically or differently, from the group consisting of deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl having 1-6 carbon atoms, substituted or unsubstituted cycloalkyl having 3-6 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-6 carbon atoms, substituted or unsubstituted aryl having 6-24 carbon atoms, substituted or unsubstituted heteroaryl having 3-12 carbon atoms, substituted or unsubstituted alkylsilyl having 3-6 carbon atoms, substituted or unsubstituted arylsilyl having 6-12 carbon atoms, substituted or unsubstituted alkylgermanyl having 3-6 carbon atoms, substituted or unsubstituted arylgermanyl having 6-12 carbon atoms, substituted or unsubstituted amino having 0-12 carbon atoms, and combinations thereof.

[0155] According to one embodiment of the present invention, wherein the R a1 , R a2 , R a3 , R a4 , R a5 At least one of the following is selected, at each occurrence, identically or differently, from the group consisting of deuterium, fluorine, cyano, hydroxyl, mercapto, methyl, ethyl, n-propyl, isopropyl, cyclopropyl, n-butyl, isobutyl, tert-butyl, cyclopentyl, neopentyl, cyclohexyl, trimethylsilyl, trimethylgermanyl, phenyl, biphenyl, terphenyl, quaterphenyl, triphenylene, tetraphenylene, naphthyl, phenanthrenyl, anthracenyl, indenyl, fluorenyl, indolyl, carbazolyl, benzofuranyl, dibenzofuranyl, benzothiazolyl, dibenzothiazolyl, benzothiophene, dibenzothiophene, dibenzoselenophene, diphenylamino, dibenzofuranylphenylamino, and combinations thereof.

[0156] According to one embodiment of the present invention, the fluorescent luminescent material is selected from the group consisting of compounds BD-1-1 to BD-1-31, compounds BD-2-1 to BD-2-28, compounds BD-3-1 to BD-3-22, compounds BD-4-1 to BD-4-36, compounds BD-5-1 to BD-5-36 and compounds BD-6-1 to BD-6-42, and the specific structures of compounds BD-1-1 to BD-1-31, compounds BD-2-1 to BD-2-28, compounds BD-3-1 to BD-3-22, compounds BD-4-1 to BD-4-36, compounds BD-5-1 to BD-5-36 and compounds BD-6-1 to BD-6-42 are shown in claim 8.

[0157] According to one embodiment of the present invention, the hydrogen in compounds BD-1-1 to BD-1-31, compounds BD-2-1 to BD-2-28, compounds BD-3-1 to BD-3-22, compounds BD-4-1 to BD-4-36, compounds BD-5-1 to BD-5-36 and compounds BD-6-1 to BD-6-42 can be partially or completely replaced by deuterium.

[0158] According to one embodiment of the present invention, the maximum emission wavelength λ in the photoluminescence spectrum of the fluorescent material max-PL It is 450nm~500nm.

[0159] According to one embodiment of the present invention, the maximum emission wavelength λ in the photoluminescence spectrum of the fluorescent material max-PL It is 450nm~470nm.

[0160] According to one embodiment of the present invention, the maximum emission wavelength in the photoluminescence spectrum of the fluorescent material λmax-PL It is 455nm~465nm.

[0161] According to one embodiment of the present invention, the full width at half maximum (FWHM) of the photoluminescence spectrum of the fluorescent material is PL Less than or equal to 45nm.

[0162] According to one embodiment of the present invention, the full width at half maximum (FWHM) of the photoluminescence spectrum of the fluorescent material is PL Less than or equal to 35nm.

[0163] According to one embodiment of the present invention, the full width at half maximum (FWHM) of the photoluminescence spectrum of the fluorescent material is PL Less than or equal to 30nm.

[0164] According to one embodiment of the present invention, the full width at half maximum (FWHM) of the photoluminescence spectrum of the fluorescent material is PL Less than or equal to 25nm.

[0165] According to one embodiment of the present invention, the full width at half maximum (FWHM) of the photoluminescence spectrum of the fluorescent material is PL Less than or equal to 20nm.

[0166] In the present invention, the maximum emission wavelength of the photoluminescence spectrum λ max-PL and full width at half maximum (FWHM) PL The test method is as follows:

[0167] The photoluminescence spectrum (PL) data of the test compound was measured using a Lingguang F98 fluorescence spectrophotometer produced by Shanghai Lingguang Technology Co., Ltd. The test compound was dissolved in toluene solvent to prepare 1×10 -6 mol / L concentration of the solution, nitrogen was passed through the prepared test solution to remove oxygen for 5 minutes, the test solution was placed in a quartz sample tube and excited with 350nm wavelength light at room temperature (298K) and its emission spectrum was measured. The emission spectrum has a maximum emission wavelength λ max-PL and full width at half maximum (FWHM) PL (i.e. the peak width at half the maximum emission peak height, the distance between the two points where a straight line parallel to the horizontal axis passes through the midpoint of the peak height and intersects the two sides of the peak).

[0168] As an example, the maximum emission wavelength λ of the photoluminescence spectrum of the following compound was measured by the above method: max-PL and full width at half maximum (FWHM) PL The specific results are shown in Table 1:

[0169] Table 1 Photoluminescence spectra of compounds λ max-PL and FWHM- PL

[0170] Compound number <![CDATA[λ max-PL (nm)]]> <![CDATA[FWHM- PL (nm)]]> BD-1-1 460 27.4 BD-1-24 460 28.9 BD 453 25.8

[0171] The specific structures of compound BD-1-1, compound BD-1-24 and compound BD are shown below:

[0172]

[0173] According to one embodiment of the present invention, the metal complex has M(L a ) m (L b ) n (L c ) q The general formula of

[0174] The M is selected from metals with a relative atomic mass greater than 40;

[0175] Ligand L a , L b and L c are respectively the first ligand, the second ligand and the third ligand coordinated with the metal M, the ligand L a , L b and L c Can be the same or different;

[0176] Ligand L a , L b and L ccan optionally be linked to form a multidentate ligand; for example, L a , L b and L c Any two of them can be connected to form a tetradentate ligand; for example, L a , L b and L c can be linked to each other to form a hexadentate ligand; or for example, L a , L b and L c None of them are connected and thus no multidentate ligand is formed;

[0177] m is 1, 2 or 3; n is 0, 1 or 2; q is 0, 1 or 2; the sum of m, n, q is equal to the oxidation state of metal M; when m is greater than or equal to 2, multiple L a Can be the same or different; when n is 2, the two L b Can be the same or different; when q is 2, the two L c Can be the same or different;

[0178] Ligand L a Having a structure represented by Formula 2:

[0179]

[0180] Ring F and Ring G are identical or different at each occurrence and are each independently selected from an unsaturated carbocyclic ring having 5 to 30 carbon atoms, an unsaturated heterocyclic ring having 1 to 30 carbon atoms, or a combination thereof;

[0181] X1 and X2 are each selected, identically or differently, from C or N;

[0182] K1 and K2 are each independently selected from a single bond, O or S;

[0183] A1 is selected from single bond, O, S, Se, (SiR q R q ) y , PR q ,NR q , (CR q R q ) y , 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 the same or different when each occurs and is selected from 1, 2, 3, 4 or 5;

[0184] R f and R g Each occurrence of the same or different means mono-, poly- or no-substitution;

[0185] R f and Rg Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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;

[0186] Adjacent substituent R f and R g can optionally be linked to form a ring;

[0187] Ligand L b and L c Each occurrence of is the same or different and is selected from monoanionic bidentate ligands.

[0188] In this embodiment, "the adjacent substituent R f and R g "can optionally be linked to form a ring" is intended to mean that adjacent substituent groups, for example, two substituents R f Between the two substituents R g Between, and R f and R g Any one or more of these substituent groups may be connected to form a ring. Obviously, none of these substituent groups may be connected to form a ring.

[0189] According to one embodiment of the present invention, the ligand L b and L c Each occurrence is identically or differently selected from the group consisting of:

[0190]

[0191] in,

[0192] Ra and R b Each occurrence is identical or different and represents mono-, poly-, or unsubstituted;

[0193] X b Each occurrence is identical or different and is selected from the group consisting of: O, S, Se, NR N1 and CR C1 R C2 ;

[0194] X c and X d Each occurrence is identically or differently selected from the group consisting of: O, S, Se and NR N2 ;

[0195] R a , R b , R c , R N1 , R N2 , R C1 and R C2 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted 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;

[0196] Adjacent substituent R a , R b , R c , R N1 , R N2 , R C1 and R C2 Can optionally be linked to form a ring.

[0197] In this embodiment, "the adjacent substituent R a , R b , R c , R N1 , R N2 , R C1 and R C2 "can optionally be linked to form a ring" is intended to mean that adjacent substituent groups, for example, two substituents R a Between the two substituents R b Between, the substituent R a and R b Between, the substituent R a and R c Between, the substituent R b and R c Between, the substituent R a and R N1 Between, the substituent R b and R N1 Between, the substituent R a and R C1 Between, the substituent R a and R C2 Between, the substituent R b and R C1 Between, the substituent R b and R C2 Between, and R C1 and R C2 Between, the substituent R a and R N2 Between, the substituent R b and R N2 Any one or more of these substituent groups may be connected to form a ring. Obviously, none of these substituent groups may be connected to form a ring.

[0198] According to one embodiment of the present invention, the metal M is selected from the group consisting of Cu, Ag, Au, Zn, Ru, Rh, Pd, Os, Ir and Pt.

[0199] According to one embodiment of the present invention, the metal M is selected from Ir or Pt.

[0200] According to one embodiment of the present invention, the metal complex has a structure represented by Formula 3:

[0201]

[0202] In formula 3,

[0203] Ring F, Ring G, Ring H and Ring I are each independently selected from an unsaturated carbocyclic ring having 5 to 30 carbon atoms, an unsaturated heterocyclic ring having 1 to 30 carbon atoms, or a combination thereof;

[0204] f is selected from 0 or 1;

[0205] A1-A4 are selected, at each occurrence, identically or differently, from a single bond, O, S, Se, (SiR q R q ) y , PR q ,NR q , (CR q R q ) y , 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 the same or different when each occurs and is selected from 1, 2, 3, 4 or 5;

[0206] X1-X4 are each independently selected from C or N;

[0207] K1-K4 are each independently selected from a single bond, O or S;

[0208] R n Each occurrence of the same or different means mono-, poly- or no-substitution;

[0209] R q , R n Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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;

[0210] Adjacent substituent R q , R n Can optionally be linked to form a ring.

[0211] In this embodiment, "the adjacent substituent R q , R n "can optionally be linked to form a ring" is intended to mean that adjacent substituent groups, for example, two substituents R q Between the two substituents R n Between, and the substituent R q and R n In between, any one or more of these adjacent substituent groups can be connected to form a ring. Obviously, these adjacent substituent groups can also not be connected to form a ring.

[0212] According to one embodiment of the present invention, the metal complex has a structure represented by Formula 3-A:

[0213]

[0214] In Formula 3-A,

[0215] Ring F is selected from an unsaturated heterocyclic ring having 1 to 30 carbon atoms; Ring G, Ring H and Ring I are each independently 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;

[0216] A3 and A4 are each independently selected from a single bond, O, S, Se, (SiRqRq)y, PRq, NRq, (CRqRq)y, 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 the same or different at each occurrence and is selected from 1, 2, 3, 4 or 5;

[0217] K1-K4 are each independently selected from a single bond, O or S;

[0218] X2-X4 are each independently selected from C or N;

[0219] Each occurrence of Rn is identical or different and represents mono-, poly- or unsubstituted;

[0220] R, Rq, Rn are each identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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;

[0221] Adjacent substituents R, Rq, and Rn can be optionally linked to form a ring.

[0222] In this embodiment, the phrase "adjacent substituents R, Rq, and Rn can optionally be linked to form a ring" is intended to mean that any one or more of adjacent substituent groups, for example, between two substituents Rq, between two substituents Rn, between substituents Rq and Rn, and between substituents R and Rn, can be linked to form a ring. Obviously, none of these adjacent substituent groups may be linked to form a ring.

[0223] According to one embodiment of the present invention, in Formula 3 or Formula 3-A, wherein the ring F is selected from an unsaturated heterocycle having 3-30 carbon atoms; the ring G, the ring H and the ring I are each independently selected from a five-membered unsaturated carbocycle, an aromatic ring having 6-30 carbon atoms, or a heteroaromatic ring having 3-30 carbon atoms.

[0224] According to one embodiment of the present invention, in Formula 3 or Formula 3-A, wherein the ring F is selected from an unsaturated heterocycle having 3-18 carbon atoms; the ring G, the ring H and the ring I are each independently selected from a five-membered unsaturated carbocycle, an aromatic ring having 6-18 carbon atoms, or a heteroaromatic ring having 3-18 carbon atoms.

[0225] According to one embodiment of the present invention, in Formula 3 or Formula 3-A, wherein the ring F is selected from an imidazole carbene ring or a benzimidazole carbene ring; the ring G, the ring H and the ring I are each independently 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.

[0226] According to one embodiment of the present invention, wherein said K1-K4 is selected from single bonds.

[0227] According to one embodiment of the present invention, the metal complex has a structure represented by one of Formula 3-1 to Formula 3-20:

[0228]

[0229]

[0230]

[0231] in,

[0232] A4 is selected, at each occurrence, identically or differently, from a single bond, O, S, Se, (SiR q R q ) y , PR q ,NR q , 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 the same or different when each occurs and is selected from 1, 2 or 3;

[0233] U1-U 28 Each occurrence is the same or different selection from CR n or N;

[0234] R u Each occurrence represents identically or differently monosubstituted, polysubstituted or unsubstituted;

[0235] R, R N , R q , R u and R nEach occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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;

[0236] Adjacent substituents R, R N , R q , R u and R n Can optionally be linked to form a ring.

[0237] In this embodiment, "adjacent substituents R, R N , R q , R u and R n "can optionally be linked to form a ring" is intended to mean that adjacent substituent groups, for example, two substituents R q Between the two substituents R u Between the two substituents R n Between the substituents R and R u Between the substituents R and R n Between, the substituent R N and R n Between, and the substituent R q and R n In between, any one or more of these adjacent substituent groups can be connected to form a ring. Obviously, these adjacent substituent groups can also not be connected to form a ring.

[0238] According to one embodiment of the present invention, the metal complex has a structure represented by Formula 3-1 or Formula 3-2.

[0239] According to one embodiment of the present invention, wherein said A4 is selected from a single bond, O or S.

[0240] According to one embodiment of the present invention, wherein said A4 is selected from O.

[0241] According to one embodiment of the present invention, the U1-U 28 Each occurrence is the same or different selection from CR n ; and said R n Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, and combinations thereof.

[0242] According to one embodiment of the present invention, wherein 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.

[0243] According to one embodiment of the present invention, the substituent R has a structure represented by Formula 4:

[0244]

[0245] In formula 4,

[0246] Ring M and Ring W 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;

[0247] X5-X8 are each identically or differently selected from C or N;

[0248] “*” indicates the connection position of the formula 4;

[0249] R m , R w Each occurrence represents identically or differently monosubstituted, polysubstituted or unsubstituted;

[0250] R m and R wEach occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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;

[0251] Adjacent substituent R m , R w Can optionally be linked to form a ring.

[0252] In this context, “the adjacent substituent R m , R w "can optionally be linked to form a ring" is intended to mean that adjacent substituent groups, for example, two substituents R m Between the two substituents R w Between, and the substituent R m and R w In between, any one or more of these adjacent substituent groups can be connected to form a ring. Obviously, these adjacent substituent groups can also not be connected to form a ring.

[0253] According to one embodiment of the present invention, the substituent R has a structure represented by Formula 4-1:

[0254]

[0255] In formula 4-1,

[0256] M1 to M 10 Each independently selected from CR m or N;

[0257] W1 to W3 are each independently selected from CR w or N;

[0258] “**” indicates the connection position of the formula 4-1;

[0259] R m and R w Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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;

[0260] Adjacent substituent R m , R w Can optionally be linked to form a ring.

[0261] According to one embodiment of the present invention, the substituent R or at least one R in Formula 4 or Formula 4-1 wselected from the group consisting of deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 2 to 20 carbon atoms, atom, an alkynyl group having 6 to 30 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.

[0262] According to one embodiment of the present invention, the substituent R or at least one R in Formula 4 or Formula 4-1 w selected 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 cycloalkyl having 2 to 20 carbon atoms, atom, an alkynyl group having 6 to 30 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.

[0263] According to one embodiment of the present invention, wherein the M1 to M 10 Each independently selected from CR m .

[0264] According to one embodiment of the present invention, W1 to W3 are each independently selected from CR w .

[0265] According to one embodiment of the present invention, wherein the R m and R w Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted 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.

[0266] According to one embodiment of the present invention, wherein the M1 to M 10 Selected from CH or CD.

[0267] According to one embodiment of the present invention, wherein said W2 is selected from CR w , the R w Selected from the group consisting of deuterium, halogen, cyano, hydroxyl, mercapto, 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.

[0268] According to one embodiment of the present invention, wherein said W2 is selected from CR w , the R w Selected from the group consisting of deuterium, halogen, cyano, hydroxyl, mercapto, 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.

[0269] According to one embodiment of the present invention, the metal complex has Pt(L a )(L b ) structure represented by the general formula, wherein L a and L b are the first ligand and the second ligand coordinated with the metal Pt respectively. For example, the L a It has 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: Wherein Indicates that L a The location of the connection.

[0270] According to one embodiment of the present invention, the metal complex is selected from the group consisting of BD1 to BD18, and the specific structures of BD1 to BD18 are shown in claim 16.

[0271] According to one embodiment of the present invention, the metal complex 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 1-25 and L a 2-1 to L a 2-6 groups, the L b Choose from L b 1-1 to L b 1-8 and L b 2-1 to L b 2-22 groups, the L a 1-1 to L a 1-25, L a 2-1 to L a 2-6, L b 1-1 to L b 1-8 and L b 2-1 to L b The specific structure of 2-22 is shown in claim 16.

[0272] According to one embodiment of the present invention, the metal complex is selected from the group consisting of Pt1 to Pt81, wherein Pt1 to Pt81 have Pt(L a )(L b ) represents the structure, and the specific structures of Pt1 to Pt81 are shown in claim 16.

[0273] According to one embodiment of the present invention, the metal complex is a phosphorescence sensitizer.

[0274] According to one embodiment of the present invention, the first host compound and the second host compound are each independently selected from at least one of the following chemical groups: 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.

[0275] According to one embodiment of the present invention, the first host compound has a structure represented by one of Formula 5 to Formula 7:

[0276]

[0277] In Formula 5, Z1 to Z3 are selected from CR4 or N at each occurrence, the same or different, and at least one of Z1 to Z3 is N;

[0278] L is identically or differently selected at each occurrence from the group consisting of 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, and combinations thereof;

[0279] In Formula 6 and Formula 7, Z4 is selected from CR4 or N at each occurrence, the same or different, and at least one Z4 is N;

[0280] Z is selected from O or S at each occurrence, the same or different;

[0281] R1-R4 are each identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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;

[0282] Adjacent substituents R4 can optionally be linked to form a ring.

[0283] Herein, "adjacent substituents R4 can be optionally connected to form a ring" is intended to mean that two adjacent substituents R4 can be connected to form a ring. Obviously, two adjacent substituents R4 may not be connected to form a ring.

[0284] According to one embodiment of the present invention, the first host compound has a structure represented by Formula 5-1 or Formula 6-1:

[0285]

[0286] In formula 5-1,

[0287] R1 and R2 are each independently selected from a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms;

[0288] L is selected from a single bond, a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 30 carbon atoms, or a combination thereof;

[0289] In formula 6-1,

[0290] Z is selected from O or S;

[0291] Z 41 -Z 48 Each occurrence is identically or differently selected from CR4, CR4' 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 CR4';

[0292] R4' is the same or different at each occurrence and 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;

[0293] R L, R4 is selected, at each occurrence, identically or differently, from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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;

[0294] Adjacent substituents R4 can optionally be linked to form a ring.

[0295] According to one embodiment of the present invention, each occurrence of L is identically or differently selected from the group consisting of: 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, and combinations thereof.

[0296] According to one embodiment of the present invention, each occurrence of L is identically or differently selected from the group consisting of: a single bond, a phenylene group, a biphenylene group, a fluorenyl group, a triphenylene group, a furanyl group, a thienyl group, a dibenzofuranyl group, a dibenzothienyl group, and combinations thereof.

[0297] According to one embodiment of the present invention, wherein the R L 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 aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, and combinations thereof.

[0298] According to one embodiment of the present invention, wherein the R L and are selected, identically or differently on each occurrence, from substituted or unsubstituted aryl radicals having 6 to 30 carbon atoms.

[0299] According to one embodiment of the present invention, wherein the R L Each occurrence is identically or differently selected from the group consisting of phenyl, biphenyl, triphenylene, indenyl, fluorenyl, indolyl, carbazolyl, benzofuranyl, dibenzofuranyl, benzothiazolyl, dibenzothiazolyl, benzothiophene, dibenzothiophene, dibenzoselenophene, and combinations thereof.

[0300] According to one embodiment of the present invention, each occurrence of R1 to R4 is the same or different and is 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, and combinations thereof.

[0301] According to one embodiment of the present invention, each occurrence of R1 to R4 is the same or different and is selected from the group consisting of: hydrogen, deuterium, halogen, cyano, substituted or unsubstituted aryl having 6-18 carbon atoms, substituted or unsubstituted heteroaryl having 3-18 carbon atoms, and combinations thereof.

[0302] According to one embodiment of the present invention, each occurrence of R1 to R4 is the same or different and is selected from the group consisting of: hydrogen, deuterium, fluorine, cyano, phenyl, biphenyl, triphenylene, indenyl, fluorenyl, indolyl, carbazolyl, benzofuranyl, dibenzofuranyl, benzothiole, dibenzothiole, benzothiophene, dibenzothiophene, dibenzoselenophene, triazine, and combinations thereof.

[0303] According to one embodiment of the present invention, in Formula 6-1, the Z 41 -Z 48 At least one of them is selected from N, and at least two of them are selected from CR4'.

[0304] According to one embodiment of the present invention, in Formula 6-1, the Z 41 -Z 48 Only one of them is selected from N, and only two of them are selected from CR4'.

[0305] According to one embodiment of the present invention, in Formula 6-1, the Z 42 Selected from N, Z 41 and Z 46 Selected from CR4'.

[0306] According to one embodiment of the present invention, the first main compound is selected from the group consisting of compound N-1-1 to compound N-1-60, compound N-2-1 to compound N-2-35 and compound N-3-1 to compound N-3-9, and the specific structures of compound N-1-1 to compound N-1-60, compound N-2-1 to compound N-2-35 and compound N-3-1 to compound N-3-9 are shown in claim 19.

[0307] According to one embodiment of the present invention, the hydrogen in the structures of Compound N-1-1 to Compound N-1-53, Compound N-1-58, Compound N-2-1 to Compound N-2-32, and Compound N-3-1 to Compound N-3-7 can be partially or completely replaced by deuterium.

[0308] According to one embodiment of the present invention, the second host compound has a structure represented by Formula 8:

[0309]

[0310] In formula 8,

[0311] 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;

[0312] 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;

[0313] Each occurrence of R6 is the same or different and represents mono-, poly- or non-substituted;

[0314] R6 is selected, at each occurrence, identically or differently, from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkyl having 2 to 20 carbon atoms, alkenyl, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3 to 20 carbon atoms, substituted or unsubstituted arylgermanyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0315] Adjacent substituents R6 can optionally be linked to form a ring.

[0316] Herein, "adjacent substituents R6 can be optionally connected to form a ring" is intended to mean that two adjacent substituents R6 can be connected to form a ring. Obviously, two adjacent substituents R6 may not be connected to form a ring.

[0317] According to one embodiment of the present invention, the second host compound has a structure represented by Formula 8-1 or Formula 8-2:

[0318]

[0319] 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;

[0320] 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;

[0321] Each occurrence of R6 is the same or different and represents mono-, poly- or non-substituted;

[0322] R6 is selected, at each occurrence, identically or differently, from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkyl having 2 to 20 carbon atoms, alkenyl, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3 to 20 carbon atoms, substituted or unsubstituted arylgermanyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0323] Adjacent substituents R6 can optionally be linked to form a ring.

[0324] According to one embodiment of the present invention, the second host compound has a structure represented by Formula 8-3 or Formula 8-4:

[0325]

[0326] 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;

[0327] 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;

[0328] Each occurrence of R6 is the same or different and represents mono-, poly- or non-substituted;

[0329] R6 is selected, at each occurrence, identically or differently, from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkyl having 2 to 20 carbon atoms, alkenyl, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3 to 20 carbon atoms, substituted or unsubstituted arylgermanyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0330] Adjacent substituents R6 can optionally be linked to form a ring.

[0331] According to one embodiment of the present invention, R6 is 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.

[0332] According to one embodiment of the present invention, each occurrence of R6 is identically or differently selected from the group consisting of: hydrogen, deuterium, halogen, cyano, substituted or unsubstituted aryl having 6-18 carbon atoms, substituted or unsubstituted heteroaryl having 3-18 carbon atoms, and combinations thereof.

[0333] According to one embodiment of the present invention, each occurrence of R6 is the same or different and is selected from the group consisting of: hydrogen, deuterium, fluorine, cyano, phenyl, biphenyl, triphenylene, indenyl, fluorenyl, indolyl, carbazolyl, benzofuranyl, dibenzofuranyl, benzothiole, dibenzothiole, benzothiophene, dibenzothiophene, dibenzoselenophene, and combinations thereof.

[0334] According to one embodiment of the present invention, the second host compound is selected from the group consisting of compound P-1 to compound P-38, and the specific structures of compound P-1 to compound P-38 are shown in claim 20.

[0335] According to one embodiment of the present invention, hydrogen in the structures of Compounds P-1 to P-23, and Compounds P-27 to P-38 can be partially or completely replaced by deuterium.

[0336] According to one embodiment of the present invention, the weight of the first host compound and the second host compound accounts for 65%-98.9% of the total weight of the light-emitting layer material, the weight of the metal complex accounts for 1%-30% of the total weight of the light-emitting layer material, and the weight of the fluorescent material accounts for 0.1%-5% of the total weight of the light-emitting layer material.

[0337] According to one embodiment of the present invention, the weight of the first host compound and the second host compound accounts for 82%-94.5% of the total weight of the light-emitting layer material, the weight of the metal complex accounts for 5%-15% of the total weight of the light-emitting layer material, and the weight of the fluorescent material accounts for 0.5%-3% of the total weight of the light-emitting layer material.

[0338] According to one embodiment of the present invention, the weight of the first host compound and the second host compound accounts for 86.5%-91.5% of the total weight of the light-emitting layer material, the weight of the metal complex accounts for 8%-12% of the total weight of the light-emitting layer material, and the weight of the fluorescent material accounts for 0.5%-1.5% of the total weight of the light-emitting layer material.

[0339] According to an embodiment of the present invention, the device emits blue light.

[0340] According to one embodiment of the present invention, the device emits deep blue light.

[0341] According to an embodiment of the present invention, the device emits white light.

[0342] According to one embodiment of the present invention, the maximum emission wavelength of the device is 460nm-470nm.

[0343] According to one embodiment of the present invention, a display device is disclosed, which includes the organic electroluminescent device according to any of the above embodiments.

[0344] According to one embodiment of the present invention, a composition is disclosed, comprising a fluorescent luminescent material, a metal complex, a first host compound and a second host compound;

[0345] The fluorescent light-emitting material has a structure represented by Formula 1:

[0346]

[0347] In formula 1,

[0348] Ring A is selected from an unsaturated carbocyclic ring having 5 to 30 carbon atoms or an unsaturated heterocyclic ring having 4 to 30 carbon atoms;

[0349] Ring B, Ring C, Ring D, and Ring E are each independently selected from an unsaturated carbocyclic ring having 5 to 30 carbon atoms or an unsaturated heterocyclic ring having 3 to 30 carbon atoms;

[0350] Y1 is selected from B, P=O, P=S, As, As=O, As=S, SiR' or GeR';

[0351] R a1 , R a2 , R a3 , R a4 , R a5 Each occurrence of the same or different means mono-, poly- or no-substitution;

[0352] R', R a1 , R a2 , R a3 , R a4 , R a5 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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;

[0353] L1, L2 are each independently selected from the group consisting of: single bond, O, S, Se, SiR L1 R L1 , PR L1 , R L1 C=CR L1 , a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 30 carbon atoms, and combinations thereof;

[0354] R L1 each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclyl having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, and combinations thereof;

[0355] Adjacent substituent R a1 can optionally be linked to form a ring;

[0356] Adjacent substituent R a2 can optionally be linked to form a ring;

[0357] Adjacent substituent R a3 can optionally be linked to form a ring;

[0358] Adjacent substituent R a4 can optionally be linked to form a ring;

[0359] Adjacent substituent R a5 can optionally be linked to form a ring;

[0360] Adjacent substituent R L1 Can optionally be linked to form a ring.

[0361] Combination with other materials

[0362] The materials described herein for use in specific layers of organic light-emitting devices can be used in combination with various other materials present in the device. Combinations of these materials are described in detail in U.S. Patent Application No. US2016 / 0359122A1, paragraphs 0132-0161, 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 readily consult the literature to identify other materials that can be used in combination.

[0363] The materials described herein as being useful in specific layers of an organic light-emitting device 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 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.

[0364] The luminescent material and metal complex used in the present invention can be easily obtained by referring to the preparation methods in the prior art, and the preparation methods are not described in detail here.

[0365] The preparation methods of organic electroluminescent devices are not limited. The preparation methods of the following embodiments are merely illustrative and should not be construed as limiting. Those skilled in the art will be able to reasonably modify the preparation methods of the following embodiments based on existing techniques. For example, the ratio of the various materials in the light-emitting layer is not particularly limited. Those skilled in the art will be able to reasonably select within a certain range based on existing techniques. For example, based on the total weight of the light-emitting layer materials, the two host compounds may account for 65%-98.9%, the metal complex may account for 1%-30%, and the light-emitting material may account for 0.1%-5%; or the two host compounds may account for 82%-94.5%, the metal complex may account for 5%-15%, and the light-emitting material may account for 0.5%-3%; or the two host compounds may account for 86.5%-91.5%, the metal complex may account for 8%-12%, and the light-emitting material may account for 0.5%-1.5%. Furthermore, the ratio of the two host compounds may range from 99:1 to 1:99; or from 80:20 to 20:80; or from 70:30 to 30:70. In the embodiments of the device, the characteristics of the device are also tested using conventional equipment in the field (including but not limited to the vapor deposition machine produced by Angstrom Engineering, the optical testing system and life testing system produced by Suzhou Fushida, the ellipsometer produced by Beijing Liangtuo, etc.) using methods familiar to those skilled in the art.

[0366] Device Examples

[0367] Device Example 1

[0368] First, a 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 deposited under a vacuum of approximately 10 -7 Compound HT and compound HI were co-deposited (weight ratio of 97:3) as hole injection layer (HIL) with a thickness of Compound HT was used as the hole transport layer (HTL) with a thickness of Compound P-21 was used as electron blocking layer (EBL) with a thickness of Then the first host compound N-1-15, the second host compound P-22, the metal complex Pt27 and the fluorescent material compound BD-1-1 were co-evaporated (weight ratio of 34.9:52.1:12:1) as the light-emitting layer (EML) with a thickness of Compound N-3-2 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 Thickness of LiF as electron injection layer, and evaporated The device was then transferred back to the glove box and encapsulated with a glass cover and a moisture getter to complete the device.

[0369] Device Example 2

[0370] Device Example 2 was carried out in the same manner as Device Example 1, except that Compound N-3-2 was used in place of Compound N-1-15 in the emission layer (EML).

[0371] Device Example 3

[0372] The implementation of Device Example 3 is the same as that of Device Example 1, except that Compound BD-1-24 is used instead of Compound BD-1-1 in the emission layer (EML).

[0373] Device Example 4

[0374] Device Example 4 was carried out in the same manner as Device Example 2, except that Compound BD-1-24 was used in place of Compound BD-1-1 in the emission layer (EML).

[0375] Device Comparative Example 1

[0376] The implementation method of device comparative example 1 is the same as that of device example 1, except that the first host compound N-1-15, the second host compound P-22 and the fluorescent light-emitting material BD-1-1 are co-evaporated (weight ratio 39.6:59.4:1) as the light-emitting layer (EML).

[0377] Device Comparative Example 2

[0378] The implementation of Comparative Device Example 2 was the same as that of Comparative Device Example 1, except that Compound N-3-2 was used in the emission layer (EML) instead of Compound N-1-15.

[0379] Device Comparative Example 3

[0380] The device of Comparative Example 3 was carried out in the same manner as in Device Example 1, except that Compound BD was used in the emission layer (EML) instead of Compound BD-1-1.

[0381] The detailed device layer structure and thickness are shown in the table below. For layers using more than one material, the different compounds are doped in the stated weight ratios.

[0382] Table 2 Partial device structures of device embodiments and comparative examples

[0383]

[0384] The specific structure of the materials used in the device is shown below:

[0385]

[0386] At 10 mA / cm 2 The CIE values ​​of Examples 1-4 and Comparative Examples 1-3 were measured, and the maximum emission wavelength (λ max ), full width at half maximum (FWHM), current efficiency (CE), and lifetime (LT97), where LT97 is the time it takes for the device's brightness to decay to 97% of its initial brightness. The relevant data are shown in Table 3.

[0387] Table 3 Device data

[0388]

[0389]

[0390] As can be seen from the data in Table 3, compared to the conventional fluorescent device of Comparative Example 1, Example 1 maintains a narrow half-width (FWHM) comparable to that of the conventional fluorescent device, but more importantly, it achieves a 263% increase in current efficiency and a 315% increase in lifetime. Similarly, compared to the conventional fluorescent device of Comparative Example 2, Example 2 also maintains a narrow half-width (FWHM) comparable to that of the conventional fluorescent device, but more importantly, it achieves a 246% increase in current efficiency and a 342% increase in lifetime. Furthermore, Examples 3 and 4, using compound BD-1-24 as the fluorescent material in the luminescent layer, also achieve excellent device performance, with a narrow FWHM and a long device lifetime, particularly achieving exceptional current efficiency. These data demonstrate that the devices of the present invention, by utilizing a metal complex as a phosphorescence sensitizer in the luminescent layer, in combination with a fluorescent material having the specific structure of Formula 1 and the first and second host compounds, achieve exceptional device performance. Not only do they maintain a narrow FWHM comparable to conventional fluorescent devices, but they also achieve significant improvements in current efficiency and lifetime, effectively offsetting the efficiency and lifetime deficiencies of conventional fluorescent devices.

[0391] Comparative Example 3 uses compound BD, which has a structure different from Formula 1, as the fluorescent material in the light-emitting layer. Device data indicates that the half-value width and current efficiency are already at relatively high levels, but the lifetime is significantly insufficient. Compared to Comparative Example 3, while the half-value widths of Examples 1 to 4 increase somewhat, they remain narrow. However, the current efficiency increases of Examples 1 to 4 range from 8.48% to 36.0%, and the lifetime increases significantly by 329% to 969%. These data demonstrate that the device of the present invention, using a fluorescent material having the specific structure of Formula 1 in the light-emitting layer, can achieve exceptional device performance.

[0392] In summary, the device of the present invention can achieve very excellent device performance, with a narrow half-width, high current efficiency and very excellent device life, by simultaneously including a fluorescent luminescent material having a structure represented by specific formula 1, a metal complex, a first host compound and a second host compound in the light-emitting layer, which proves that the device of the present invention has excellent performance and broad application prospects.

[0393] It should be understood that the various embodiments described herein are merely examples and are not intended to limit the scope of the present invention. Therefore, as will be apparent to those skilled in the art, the claimed invention may include variations of the specific embodiments and preferred embodiments described herein. Many of the materials and structures described herein can be replaced with other materials and structures without departing from the spirit of the present invention. It should be understood that the various theories regarding why the present invention works are not intended to be restrictive.

Claims

1. An organic electroluminescent device, comprising: anode, cathode, and a light-emitting layer disposed between the anode and the cathode, wherein the light-emitting layer comprises a fluorescent light-emitting material, a metal complex, a first host compound and a second host compound; The fluorescent light-emitting material has a structure represented by Formula 1: In formula 1, Ring A is selected from an unsaturated carbocyclic ring having 5 to 30 carbon atoms or an unsaturated heterocyclic ring having 4 to 30 carbon atoms; Ring B, Ring C, Ring D, and Ring E are each independently selected from an unsaturated carbocyclic ring having 5 to 30 carbon atoms or an unsaturated heterocyclic ring having 3 to 30 carbon atoms; Y1 is selected from B, P=O, P=S, As, As=O, As=S, SiR' or GeR'; R a1 , R a2 , R a3 , R a4 , R a5 Each occurrence of the same or different means mono-, poly- or no-substitution; R', R a1 , R a2 , R a3 , R a4 , R a5 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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; L1, L2 are each independently selected from the group consisting of: single bond, O, S, Se, SiR L1 R L1 , PR L1 , R L1 C=CR L1 , a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 30 carbon atoms, and combinations thereof; R L1 each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclyl having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, and combinations thereof; Adjacent substituent R a1 can optionally be linked to form a ring; Adjacent substituent R a2 can optionally be linked to form a ring; Adjacent substituent R a3 can optionally be linked to form a ring; Adjacent substituent R a4 can optionally be linked to form a ring; Adjacent substituent R a5 can optionally be linked to form a ring; Adjacent substituent R L1 Can optionally be linked to form a ring.

2. The organic electroluminescent device according to claim 1, wherein the ring A, ring B, ring C, ring D and ring E are each independently selected from a five-membered unsaturated carbocyclic ring, an aromatic ring having 6 to 30 carbon atoms or a heteroaromatic ring having 4 to 30 carbon atoms; Preferably, the ring A, ring B, ring C, ring D and ring E are each selected from the group consisting of a five-membered unsaturated carbocyclic ring, an aromatic ring having 6 to 18 carbon atoms or a heteroaromatic ring having 4 to 18 carbon atoms, the same or different when they occur each time; More preferably, each occurrence of Ring A, Ring B, Ring C, Ring D and Ring E is identically or differently selected from a benzene ring, a pyridine ring, a naphthalene ring, a phenanthrene ring, an anthracene 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, a silole ring, or a combination thereof. 3 . The organic electroluminescent device according to claim 1 , wherein the Y 1 is selected from B, P═O or P═S; preferably, the Y 1 is selected from B.

4. The organic electroluminescent device according to claim 1, wherein the fluorescent light-emitting material has a structure represented by Formula 1-1: in, R a1 , R a2 , R a3 , R a4 , R a5 Each occurrence of the same or different means mono-, poly- or no-substitution; R a1 , R a2 , R a3 , R a4 , R a5 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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; L1, L2 are each independently selected from the group consisting of: single bond, O, S, Se, SiR L1 R L1 , PR L1 , R L1 C=CR L1 , a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 30 carbon atoms, and combinations thereof; R L1 each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclyl having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, and combinations thereof; Adjacent substituent R a1 can optionally be linked to form a ring; Adjacent substituent R a2 can optionally be linked to form a ring; Adjacent substituent R a3 can optionally be linked to form a ring; Adjacent substituent R a4 can optionally be linked to form a ring; Adjacent substituent R a5 can optionally be linked to form a ring; Adjacent substituent R L1 Can optionally be linked to form a ring. 5 . The organic electroluminescent device according to claim 1 , wherein L1 and L2 are each independently selected from a single bond, O or S; preferably, L1 and L2 are a single bond.

6. The organic electroluminescent device according to claim 1 or 4, wherein the R a1 , R a2 , R a3 , R a4 , R a5 each occurrence being identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclyl having 3-20 ring atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3-20 carbon atoms, substituted or unsubstituted arylgermanyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, and combinations thereof; Preferably, R a1 , R a2 , R a3 , R a4 , R a5 each occurrence being identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl having 1-6 carbon atoms, substituted or unsubstituted cycloalkyl having 3-6 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-6 carbon atoms, substituted or unsubstituted heterocyclyl having 3-6 ring atoms, substituted or unsubstituted aryl having 6-24 carbon atoms, substituted or unsubstituted heteroaryl having 3-12 carbon atoms, substituted or unsubstituted alkylsilyl having 3-6 carbon atoms, substituted or unsubstituted arylsilyl having 6-12 carbon atoms, substituted or unsubstituted alkylgermanyl having 3-6 carbon atoms, substituted or unsubstituted arylgermanyl having 6-12 carbon atoms, substituted or unsubstituted amino having 0-12 carbon atoms, and combinations thereof; More preferably, the R a1 , R a2 , R a3 , R a4 , R a5 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, fluorine, cyano, hydroxyl, mercapto, methyl, ethyl, n-propyl, isopropyl, cyclopropyl, n-butyl, isobutyl, tert-butyl, cyclopentyl, neopentyl, cyclohexyl, trimethylsilyl, trimethylgermanyl, phenyl, biphenyl, terphenyl, quaterphenyl, triphenylene, tetraphenylene, naphthyl, phenanthrenyl, anthracenyl, indenyl, fluorenyl, indolyl, carbazolyl, benzofuranyl, dibenzofuranyl, benzothiazolyl, dibenzothiazolyl, benzothiophene, dibenzothiophene, dibenzoselenophene, diphenylamino, dibenzofuranylphenylamino, and combinations thereof.

7. The organic electroluminescent device according to claim 1 or 4, wherein the R a1 , R a2 , R a3 , R a4 , R a5 At least one of the following is selected, at each occurrence, identically or differently, from the group consisting of: deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted 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 alkyl having 2 to 20 carbon atoms substituted or unsubstituted alkenyl groups having 6 to 30 carbon atoms, substituted or unsubstituted aryl groups having 3 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; Preferably, the R a1 , R a2 , R a3 , R a4 , R a5 wherein at least one of the following groups is selected, at each occurrence, identically or differently, from the group consisting of deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl having 1-6 carbon atoms, substituted or unsubstituted cycloalkyl having 3-6 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-6 carbon atoms, substituted or unsubstituted aryl having 6-24 carbon atoms, substituted or unsubstituted heteroaryl having 3-12 carbon atoms, substituted or unsubstituted alkylsilyl having 3-6 carbon atoms, substituted or unsubstituted arylsilyl having 6-12 carbon atoms, substituted or unsubstituted alkylgermanyl having 3-6 carbon atoms, substituted or unsubstituted arylgermanyl having 6-12 carbon atoms, substituted or unsubstituted amino having 0-12 carbon atoms, and combinations thereof; More preferably, the R a1 , R a2 , R a3 , R a4 , R a5 At least one of the following is selected, at each occurrence, identically or differently, from the group consisting of deuterium, fluorine, cyano, hydroxyl, mercapto, methyl, ethyl, n-propyl, isopropyl, cyclopropyl, n-butyl, isobutyl, tert-butyl, cyclopentyl, neopentyl, cyclohexyl, trimethylsilyl, trimethylgermanyl, phenyl, biphenyl, terphenyl, quaterphenyl, triphenylene, tetraphenylene, naphthyl, phenanthrenyl, anthracenyl, indenyl, fluorenyl, indolyl, carbazolyl, benzofuranyl, dibenzofuranyl, benzothiazolyl, dibenzothiazolyl, benzothiophene, dibenzothiophene, dibenzoselenophene, diphenylamino, dibenzofuranylphenylamino, and combinations thereof.

8. The organic electroluminescent device according to claim 1, wherein the fluorescent light-emitting material is selected from the group consisting of compound BD-1-1 to compound BD-1-31, compound BD-2-1 to compound BD-2-28, compound BD-3-1 to compound BD-3-22, compound BD-4-1 to compound BD-4-36, compound BD-5-1 to compound BD-5-36 and compound BD-6-1 to compound BD-6-42: in, Optionally, the hydrogen in compounds BD-1-1 to BD-1-31, compounds BD-2-1 to BD-2-28, compounds BD-3-1 to BD-3-22, compounds BD-4-1 to BD-4-36, compounds BD-5-1 to BD-5-36 and compounds BD-6-1 to BD-6-42 can be partially or fully replaced by deuterium.

9. The organic electroluminescent device according to claim 1, wherein the maximum emission wavelength λ in the photoluminescence spectrum of the fluorescent material is max-PL is 450nm to 500nm; preferably, the maximum emission wavelength λ in the photoluminescence spectrum of the fluorescent material max-PL More preferably, the maximum emission wavelength λ in the photoluminescence spectrum of the fluorescent material max-PL It is 455nm~465nm.

10. The organic electroluminescent device according to claim 1, wherein the full width at half maximum (FWHM) of the photoluminescence spectrum of the fluorescent material is PL Less than or equal to 45nm; Preferably, the full width at half maximum FWHM in the photoluminescence spectrum of the fluorescent material is PL Less than or equal to 35nm; More preferably, the full width at half maximum FWHM- PL Less than or equal to 30nm.

11. The organic electroluminescent device according to claim 1, wherein the metal complex has M(L a ) m (L b ) n (L c ) q The general formula of The metal M is selected from metals with a relative atomic mass greater than 40; preferably, the metal M is selected from the group consisting of Cu, Ag, Au, Zn, Ru, Rh, Pd, Os, Ir and Pt; Ligand L a , L b and L c are respectively the first ligand, the second ligand and the third ligand coordinated with the metal M, the ligand L a , L b and L c Can be the same or different; Ligand L a , L b and L c can optionally be linked to form multidentate ligands; m is 1, 2 or 3; n is 0, 1 or 2; q is 0, 1 or 2; the sum of m, n, q is equal to the oxidation state of metal M; when m is greater than or equal to 2, multiple L a Can be the same or different; when n is 2, the two L b Can be the same or different; when q is 2, the two L c Can be the same or different; Ligand L a Having a structure represented by Formula 2: Ring F and Ring G are identically or differently selected at each occurrence from an unsaturated carbocyclic ring having 5 to 30 carbon atoms, an unsaturated heterocyclic ring having 1 to 30 carbon atoms, or a combination thereof; X1 and X2 are each selected, identically or differently, from C or N; K1 and K2 are each independently selected from a single bond, O or S; A1 is selected from single bond, O, S, Se, (SiR q R q ) y , PR q ,NR q , (CR q R q ) y , 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 the same or different when each occurs and is selected from 1, 2, 3, 4 or 5; R f and R g Each occurrence of the same or different means mono-, poly- or no-substitution; R f and R g Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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; Adjacent substituent R f and R g can optionally be linked to form a ring; Ligand L b and L c the same or different at each occurrence selected from monoanionic bidentate ligands; Preferably, the ligand L b and L c Each occurrence is identically or differently selected from the group consisting of: in, R a and R b Each occurrence is identical or different and represents mono-, poly-, or unsubstituted; X b Each occurrence is identical or different and is selected from the group consisting of: O, S, Se, NR N1 and CR C1 R C2 ; X c and X d Each occurrence is identically or differently selected from the group consisting of: O, S, Se and NR N2 ; R a , R b , R c , R N1 , R N2 , R C1 and R C2 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted 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; Adjacent substituent R a , R b , R c , R N1 , R N2 , R C1 and R C2 Can optionally be linked to form a ring.

12. The organic electroluminescent device according to claim 1, wherein the metal complex has a structure represented by Formula 3: In formula 3, Ring F, Ring G, Ring H and Ring I are each independently selected from an unsaturated carbocyclic ring having 5 to 30 carbon atoms, an unsaturated heterocyclic ring having 1 to 30 carbon atoms, or a combination thereof; f is selected from 0 or 1; A1-A4 are selected, at each occurrence, identically or differently, from a single bond, O, S, Se, (SiR q R q ) y , PR q ,NR q , (CR q R q ) y , 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 the same or different when each occurs and is selected from 1, 2, 3, 4 or 5; X1-X4 are each independently selected from C or N; K1-K4 are each independently selected from a single bond, O or S; R n Each occurrence of the same or different means mono-, poly- or no-substitution; R q , R n Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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; Adjacent substituent R q , R n can optionally be linked to form a ring; Preferably, the metal complex has a structure represented by Formula 3-A: In Formula 3-A, Ring F is selected from an unsaturated heterocyclic ring having 1 to 30 carbon atoms; Ring G, Ring H and Ring I are each independently 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; A3, A4 are each independently selected from a single bond, O, S, Se, (SiR q R q ) y , PR q ,NR q , (CR q R q ) y , 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 the same or different when each occurs and is selected from 1, 2, 3, 4 or 5; K1-K4 are each independently selected from a single bond, O or S; X2-X4 are each independently selected from C or N; R n Each occurrence represents identically or differently monosubstituted, polysubstituted or unsubstituted; R, R q , R n Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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; Adjacent substituents R, R q , R n Can optionally be linked to form a ring.

13. The organic electroluminescent device according to claim 12, wherein the ring F is selected from an unsaturated heterocyclic ring having 3 to 30 carbon atoms; the ring G, the ring H and the ring I are each independently selected from a five-membered unsaturated carbocyclic ring, an aromatic ring having 6 to 30 carbon atoms, or a heteroaromatic ring having 3 to 30 carbon atoms; Preferably, the ring F is selected from an unsaturated heterocyclic ring having 3-18 carbon atoms; the ring G, the ring H and the ring I are each independently selected from a five-membered unsaturated carbocyclic ring, an aromatic ring having 6-18 carbon atoms, or a heteroaromatic ring having 3-18 carbon atoms; More preferably, the ring F is selected from an imidazole carbene ring or a benzimidazole carbene ring; and the ring G, the ring H and the ring I are each independently 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.

14. The organic electroluminescent device according to claim 1, wherein the metal complex has a structure represented by one of Formula 3-1 to Formula 3-20: in, A4 is selected, at each occurrence, identically or differently, from a single bond, O, S, Se, (SiR q R q ) y , PR q ,NR q , 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 the same or different when each occurs and is selected from 1, 2 or 3; U1-U 28 Each occurrence is the same or different selection from CR n or N; R u Each occurrence represents identically or differently monosubstituted, polysubstituted or unsubstituted; R, R N , R q , R u and R n Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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; Adjacent substituents R, R N , R q , R u and R n can optionally be linked to form a ring; Preferably, the metal complex has a structure represented by Formula 3-1 or Formula 3-2.

15. The organic electroluminescent device according to claim 12 or 14, wherein R has a structure represented by Formula 4: In formula 4, Ring M and Ring W 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; X5-X8 are each identically or differently selected from C or N; "*" indicates the connection position of the formula 4; R m , R w Each occurrence represents identically or differently monosubstituted, polysubstituted or unsubstituted; R m and R w Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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; Adjacent substituent R m , R w can optionally be linked to form a ring; Preferably, R has a structure represented by Formula 4-1: In formula 4-1, M1 to M 10 Each independently selected from CR m or N; W1 to W3 are each independently selected from CR w or N; R m and R w Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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; Adjacent substituent R m , R w can optionally be linked to form a ring; More preferably, at least one of the R w selected from the group consisting of deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 2 to 20 carbon atoms, atom, an alkynyl group having 6 to 30 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.

16. The organic electroluminescent device according to claim 1, wherein the metal complex is selected from the group consisting of BD1 to BD18: Or the metal complex 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 1-25 and L a 2-1 to L a Groups of 2-6: The L a 1-1 to L a 1-25 and L a 2-1 to L a The "#" in the 2-6 structure indicates that b The location of the connection; the L b Choose from L b 1-1 to L b 1-8 and L b 2-1 to L b Groups consisting of 2-22: The L b 1-1 to L b 1-8 and L b 2-1 to L b The "#" in the 2-22 structure indicates that b The location of the connection; Preferably, the metal complex is selected from the group consisting of Pt1 to Pt81, wherein Pt1 to Pt81 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: The organic electroluminescent device according to claim 1 , wherein the metal complex is a phosphorescent sensitizer.

18. The organic electroluminescent device of claim 1 , wherein the first host compound and the second host compound are each independently selected from a group comprising at least one of the following chemical groups: 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.

19. The organic electroluminescent device according to claim 1, wherein the first host compound has a structure represented by one of Formula 5 to Formula 7: In Formula 5, Z1 to Z3 are selected from CR4 or N at each occurrence, the same or different, and at least one of Z1 to Z3 is N; L is identically or differently selected at each occurrence from the group consisting of 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, and combinations thereof; In Formula 6 and Formula 7, Z4 is selected from CR4 or N at each occurrence, the same or different, and at least one Z4 is N; Z is selected from O or S at each occurrence, the same or different; R1-R4 are each identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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; Adjacent substituents R4 can optionally be linked to form a ring; Preferably, the first host compound has a structure represented by Formula 5-1 or Formula 6-1: In formula 5-1, R1 and R2 are each independently selected from a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms; L is selected from a single bond, a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 30 carbon atoms, or a combination thereof; In formula 6-1, Z is selected from O or S; Z 41 -Z 48 Each occurrence is identically or differently selected from CR4, CR4' 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 CR4'; R4' is the same or different at each occurrence and 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; R L , R4 is selected, at each occurrence, identically or differently, from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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; Adjacent substituents R4 can optionally be linked to form a ring; More preferably, the first host compound is selected from the group consisting of Compound N-1-1 to Compound N-1-60, Compound N-2-1 to Compound N-2-35 and Compound N-3-1 to Compound N-3-9: in, Optionally, hydrogen in the structures of Compound N-1-1 to Compound N-1-53, Compound N-1-58, Compound N-2-1 to Compound N-2-32, and Compound N-3-1 to Compound N-3-7 can be partially or completely replaced by deuterium.

20. The organic electroluminescent device according to claim 1, wherein the second host compound has a structure represented by Formula 8: In formula 8, 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; 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; Each occurrence of R6 is the same or different and represents mono-, poly- or non-substituted; R6 is selected, at each occurrence, identically or differently, from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkyl having 2 to 20 carbon atoms, alkenyl, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3 to 20 carbon atoms, substituted or unsubstituted arylgermanyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof; Adjacent substituents R6 can optionally be linked to form a ring; Preferably, the second host compound has a structure represented by Formula 8-1 or Formula 8-2: 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; 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; Each occurrence of R6 is the same or different and represents mono-, poly- or non-substituted; R6 is selected, at each occurrence, identically or differently, from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkyl having 2 to 20 carbon atoms, alkenyl, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3 to 20 carbon atoms, substituted or unsubstituted arylgermanyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof; Adjacent substituents R6 can optionally be linked to form a ring; More preferably, the second host compound is selected from the group consisting of Compound P-1 to Compound P-38: in, Optionally, hydrogen in the structures of Compound P-1 to Compound P-23, Compound P-27 to Compound P-38 can be partially or completely replaced by deuterium.

21. The organic electroluminescent device according to claim 1, wherein the weight ratio of the first host compound and the second host compound to the total weight of the light-emitting layer materials is 65%-98.9%, the weight ratio of the metal complex to the total weight of the light-emitting layer materials is 1%-30%, and the weight ratio of the fluorescent material to the total weight of the light-emitting layer materials is 0.1%-5%; Preferably, the weight ratio of the first host compound and the second host compound to the total weight of the light-emitting layer material is 82%-94.5%, the weight ratio of the metal complex to the total weight of the light-emitting layer material is 5%-15%, and the weight ratio of the fluorescent material to the total weight of the light-emitting layer material is 0.5%-3%; More preferably, the weight of the first host compound and the second host compound accounts for 86.5%-91.5% of the total weight of the light-emitting layer material, the weight of the metal complex accounts for 8%-12% of the total weight of the light-emitting layer material, and the weight of the fluorescent material accounts for 0.5%-1.5% of the total weight of the light-emitting layer material.

22. The organic electroluminescent device according to claim 1, wherein the device emits deep blue light; preferably, the maximum emission wavelength of the device is 460 nm-470 nm.

23. A display device comprising the organic electroluminescent device according to any one of claims 1 to 22.

24. A composition comprising a fluorescent light-emitting material, a metal complex, a first host compound, and a second host compound; The fluorescent light-emitting material has a structure represented by Formula 1: In formula 1, Ring A is selected from an unsaturated carbocyclic ring having 5 to 30 carbon atoms or an unsaturated heterocyclic ring having 4 to 30 carbon atoms; Ring B, Ring C, Ring D, and Ring E are each independently selected from an unsaturated carbocyclic ring having 5 to 30 carbon atoms or an unsaturated heterocyclic ring having 3 to 30 carbon atoms; Y1 is selected from B, P=O, P=S, As, As=O, As=S, SiR' or GeR'; R a1 , R a2 , R a3 , R a4 , R a5 Each occurrence of the same or different means mono-, poly- or no-substitution; R', R a1 , R a2 , R a3 , R a4 , R a5 Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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; L1, L2 are each independently selected from the group consisting of: single bond, O, S, Se, SiR L1 R L1 , PR L1 , R L1 C=CR L1 , a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 30 carbon atoms, and combinations thereof; R L1 each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclyl having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, and combinations thereof; Adjacent substituent R a1 can optionally be linked to form a ring; Adjacent substituent R a2 can optionally be linked to form a ring; Adjacent substituent R a3 can optionally be linked to form a ring; Adjacent substituent R a4 can optionally be linked to form a ring; Adjacent substituent R a5 can optionally be linked to form a ring; Adjacent substituent R L1 Can optionally be linked to form a ring.

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