Organic electroluminescent device

Abstract

Disclosed is an organic electroluminescent device. The organic light-emitting device comprises an anode, a cathode and a light-emitting layer arranged between the anode and the cathode, the light-emitting layer at least comprises a first metal complex and a second metal complex which are different, and the maximum emission wavelengths of photoluminescence spectra of the first metal complex and the second metal complex are both larger than or equal to 590 nm; the difference value of the maximum emission wavelength of the first metal complex and the maximum emission wavelength of the second metal complex is larger than 0 nm and smaller than or equal to 20 nm, and / or the difference value of the relative molecular mass of the first metal complex and the relative molecular mass of the second metal complex is smaller than or equal to 50. According to the organic light-emitting device, the light-emitting color of the device can be finely regulated and controlled while low voltage and high efficiency are maintained. The invention also discloses electronic equipment comprising the organic light-emitting device.

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 at least two specific metal complexes in a light-emitting layer. Background Art

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

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

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

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

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

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

[0008] The previous patent application CN113745413A of the applicant of the present invention disclosed an organic electroluminescent device, whose organic layer contained two different metal complexes. However, the application focused on the effect of using two green light emitting materials in the light emitting layer on the device performance. The maximum emission wavelength of the light emitting materials used in its embodiments was all below 550nm. The application did not focus on the effect of mixed light emitting materials with a light emitting wavelength above 590nm on the device.

[0009] CN115477940A discloses a luminescent material composition, comprising a first metal complex and a second metal complex, wherein the first metal complex and the second metal complex are different from each other and both have the following structure However, this application does not focus on the effect of the selection of luminescent materials on the emission wavelength of the device.

[0010] US20040178720A1 discloses an organic electroluminescent device, wherein the light-emitting layer contains at least two different phosphorescent dopants, each of which contains iridium or platinum. Although the embodiments thereof mention the emission wavelengths of the two phosphorescent dopants, the application does not focus on the effect of the selection of phosphorescent dopants on the color of the device.

[0011] With the development of the OLED industry, in addition to the demand for device performance improvement, the device's ability to meet the emission of specific wavelengths is also one of the industry's needs. Researchers in this field usually start from the structure of the luminescent material, develop some luminescent materials with specific structures, and continuously optimize the material structure to adjust the emission wavelength. However, this method faces huge challenges and requires a lot of experiments to verify. At the same time, it is also necessary to ensure that the device has excellent performance, which greatly increases the difficulty of material development. Therefore, how to conveniently and finely adjust the device wavelength while ensuring device performance is a technical problem that needs to be solved in this field. Summary of the invention

[0012] The present invention aims to provide a novel organic electroluminescent device to solve at least part of the above problems. The light-emitting layer of the organic electroluminescent device contains at least a specific first metal complex and a second metal complex. The organic electroluminescent device can finely control the luminescent color of the device while maintaining low voltage and high efficiency.

[0013] According to one embodiment of the present invention, an organic electroluminescent device is disclosed, comprising:

[0014] anode,

[0015] cathode,

[0016] and a light-emitting layer disposed between the anode and the cathode, the light-emitting layer comprising at least a first metal complex and a second metal complex, wherein the first metal complex and the second metal complex are different, the maximum emission wavelengths of the photoluminescence spectra of the first metal complex and the second metal complex are both greater than or equal to 590 nm; and the first metal complex and the second metal complex at least meet any one or two of the following conditions:

[0017] (1) The difference in the maximum emission wavelengths of the photoluminescence spectra of the first metal complex and the second metal complex is greater than 0 nm and less than or equal to 20 nm;

[0018] (2) The difference in relative molecular weight between the first metal complex and the second metal complex is less than or equal to 50.

[0019] According to one embodiment of the present invention, an electronic device is also disclosed, which includes the organic electroluminescent device described in the above embodiment.

[0020] The present invention discloses a novel organic electroluminescent device to solve at least part of the above problems. The light-emitting layer of the organic electroluminescent device contains at least a specific first metal complex and a second metal complex. Since the light-emitting layer of the organic electroluminescent device contains the at least two specific metal complexes, the light-emitting color of the device can be finely controlled while maintaining a low device voltage and a high light-emitting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of an organic light-emitting device that may contain the electroluminescent device disclosed herein.

[0022] Figure 2 is a schematic diagram of another organic light-emitting device that may contain the electroluminescent device disclosed herein. DETAILED DESCRIPTION

[0023] OLEDs can be manufactured on a variety of substrates, such as glass, plastic, and metal. Figure 1 An organic light-emitting device 100 is shown schematically and non-limitingly. The figure is not necessarily drawn to scale, and some layer structures in the figure may be omitted as needed. The device 100 may include a substrate 101, an anode 110, a hole injection layer 120, a hole transport layer 130, an electron blocking layer 140, a light-emitting layer 150, a hole blocking layer 160, an electron transport layer 170, an electron injection layer 180 and a cathode 190. The device 100 can be manufactured by depositing the described layers in sequence. The properties and functions of each layer and exemplary materials are described in more detail in columns 6-10 of U.S. Patent No. 7,279,704 B2, the entire contents of which are incorporated herein by reference.

[0024] There are more examples of each of these layers. For example, a flexible and transparent substrate-anode combination is disclosed in U.S. Patent No. 5,844,363, which is incorporated by reference in its entirety. An example of a p-doped hole transport layer is m-MTDATA doped with F4-TCNQ at a molar ratio of 1:50, as disclosed in U.S. Patent Application Publication No. 2003 / 0230980, which is incorporated by reference in its entirety. An example of a host material is disclosed in U.S. Patent No. 6,303,238 to Thompson et al., which is incorporated by reference in its entirety. An example of an n-doped electron transport layer is BPhen doped with Li at a molar ratio of 1:1, as disclosed in U.S. Patent Application Publication No. 2003 / 0230980, which is incorporated by reference in its entirety. U.S. Patent Nos. 5,703,436 and 5,707,745, which are incorporated by reference in their entirety, disclose examples of cathodes including composite cathodes having a thin layer of metal such as Mg:Ag with an overlying transparent, conductive, sputter-deposited ITO layer. The principles and use of barrier layers are described in more detail in U.S. Patent No. 6,097,147 and U.S. Patent Application Publication No. 2003 / 0230980, which are incorporated by reference in their entirety. Examples of injection layers are provided in U.S. Patent Application Publication No. 2004 / 0174116, which is incorporated by reference in its entirety. A description of protective layers can be found in U.S. Patent Application Publication No. 2004 / 0174116, which is incorporated by reference in its entirety.

[0025] The above layered structure is provided by way of non-limiting example. The functions of an OLED can be achieved by combining the various layers described above, or some layers can be omitted entirely. It can also include other layers not explicitly described. Within each layer, a single material or a mixture of multiple materials can be used to achieve optimal performance. Any functional layer can include several sublayers. For example, a light-emitting layer can have two layers of different light-emitting materials to achieve a desired light-emitting spectrum.

[0026] In one embodiment, an OLED may be described as having an "organic layer" disposed between a cathode and an anode. The organic layer may include one or more layers.

[0027] OLED also requires encapsulation layers, such as Figure 2 The organic light emitting device 200 is schematically and non-limitingly shown. Figure 1The difference is that an encapsulation layer 102 may also be included on the cathode 190 to prevent harmful substances from the environment, such as moisture and oxygen. Any material that can provide an encapsulation function can be used as an encapsulation layer, such as glass or an organic-inorganic hybrid layer. The encapsulation layer should be placed directly or indirectly on the outside of the OLED device. Multilayer thin film encapsulation is described in U.S. Patent No. 7,968,146 B2, the entire contents of which are incorporated herein by reference.

[0028] Devices manufactured according to embodiments of the present invention can be incorporated into various consumer products having one or more electronic component modules (or units) of the device. Some examples of these consumer products include flat panel displays, monitors, medical monitors, televisions, billboards, lights for indoor or outdoor lighting and / or signaling, heads-up displays, fully or partially transparent displays, flexible displays, smart phones, tablet computers, tablet phones, wearable devices, smart watches, laptop computers, digital cameras, camcorders, viewfinders, micro displays, 3-D displays, vehicle displays, and taillights.

[0029] The materials and structures described herein may also be used in other organic electronic devices listed above.

[0030] As used herein, "top" means farthest from the substrate, while "bottom" means closest to the substrate. Where a first layer is described as being "disposed" "on" a second layer, the first layer is disposed farther from the substrate. Unless it is specified that the first layer is "in contact with" the second layer, other layers may be present between the first and second layers. For example, a cathode may be described as being "disposed" "on" an anode even though various organic layers are present between the cathode and the anode.

[0031] 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.

[0032] A ligand may be referred to as "photoactive" when it is believed that the ligand directly contributes to the photoactive property of the emissive material. A ligand may be referred to as "ancillary" when it is believed that the ligand does not contribute to the photoactive property of the emissive material, but the ancillary ligand may alter the properties of the photoactive ligand.

[0033] 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).

[0034] On the other hand, E-type delayed fluorescence does not rely on the collision of two triplets, but on the conversion between triplet and singlet excited state. Compounds capable of producing E-type delayed fluorescence need to have a very small single-triplet gap for the conversion between energy states. Thermal energy can activate the transition from triplet back to singlet. This type of delayed fluorescence is also called thermally activated delayed fluorescence (TADF). The notable feature of TADF is that the delayed component increases with increasing temperature. If the reverse intersystem crossing (RISC) rate is fast enough to minimize the non-radiative decay by triplet, the fraction of backfilling singlet excited state may reach 75%. The total singlet fraction can be 100%, far exceeding the 25% of the spin statistics of the excitons generated by electricity.

[0035] The E-type delayed fluorescence feature can be seen in an exciplex system or a single compound. Without being bound by theory, it is believed that the E-type delayed fluorescence requires the luminescent material to have a small singlet-triplet energy gap (ΔE S-T ). Organic non-metal-containing donor-acceptor luminescent materials may be able to achieve this. The emission of these materials is usually characterized by donor-acceptor charge transfer (CT) type emission. The spatial separation of the HOMO and LUMO in these donor-acceptor type compounds usually produces a small ΔE S-T These states may include CT states. Generally, donor-acceptor light-emitting materials are constructed by linking an electron donor moiety (eg, an amino group or a carbazole derivative) to an electron acceptor moiety (eg, a six-membered aromatic ring containing N).

[0036] Definition of Substituent Terms

[0037] Halogen or halide - as used herein includes fluorine, chlorine, bromine and iodine.

[0038] Alkyl - as used herein, includes straight chain and branched alkyl groups. The alkyl group may be an alkyl group having 1 to 20 carbon atoms, preferably an alkyl group having 1 to 12 carbon atoms, and more preferably an alkyl group having 1 to 6 carbon atoms. Examples of alkyl groups include methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, n-hexyl, n-heptyl, n-octyl, n-nonyl, n-decyl, n-undecyl, n-dodecyl, n-tridecyl, n-tetradecyl, n-pentadecyl, n-hexadecyl, n-heptadecyl, n-octadecyl, neopentyl, 1-methylpentyl, 2-methylpentyl, 1-pentylhexyl, 1-butylpentyl, 1-heptyloctyl, 3-methylpentyl. Among the above, methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, neopentyl and n-hexyl are preferred. In addition, the alkyl group may be optionally substituted.

[0039] Cycloalkyl - as used herein, includes cyclic alkyl. Cycloalkyl can be a cycloalkyl having 3 to 20 ring carbon atoms, preferably a cycloalkyl having 4 to 10 carbon atoms. Examples of cycloalkyl include cyclobutyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4,4-dimethylcyclohexyl, 1-adamantyl, 2-adamantyl, 1-norbornyl, 2-norbornyl, etc. Among the above, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4,4-dimethylcyclohexyl are preferred. In addition, cycloalkyl can be optionally substituted.

[0040] Heteroalkyl - As used herein, a heteroalkyl group comprises one or more carbons in an alkyl chain substituted with a heteroatom selected from the group consisting of a nitrogen atom, an oxygen atom, a sulfur atom, a selenium atom, a phosphorus atom, a silicon atom, a germanium atom and a boron atom. The heteroalkyl group may be a heteroalkyl group having 1 to 20 carbon atoms, preferably a heteroalkyl group having 1 to 10 carbon atoms, and more preferably a heteroalkyl group having 1 to 6 carbon atoms. Examples of heteroalkyl include methoxymethyl, ethoxymethyl, ethoxyethyl, methylthiomethyl, ethylthiomethyl, ethylthioethyl, methoxymethoxymethyl, ethoxymethoxymethyl, ethoxyethoxyethyl, hydroxymethyl, hydroxyethyl, hydroxypropyl, mercaptomethyl, mercaptoethyl, mercaptopropyl, aminomethyl, aminoethyl, aminopropyl, dimethylaminomethyl, trimethylgermanylmethyl, trimethylgermanylethyl, trimethylgermanylisopropyl, dimethylethylgermanylmethyl, dimethylisopropylgermanylmethyl, tert-butyldimethylgermanylmethyl, triethylgermanylmethyl, triethylgermanylethyl, triisopropylgermanylmethyl, triisopropylgermanylethyl, trimethylsilylmethyl, trimethylsilylethyl, trimethylsilylisopropyl, triisopropylsilylmethyl, triisopropylsilylethyl. In addition, heteroalkyl may be optionally substituted.

[0041] Alkenyl - as used herein, encompasses straight chain, branched and cyclic olefin groups. Alkenyl can be an alkenyl containing 2 to 20 carbon atoms, preferably an alkenyl having 2 to 10 carbon atoms. Examples of alkenyl include vinyl, propenyl, 1-butenyl, 2-butenyl, 3-butenyl, 1,3-butadienyl, 1-methylvinyl, styryl, 2,2-diphenylvinyl, 1,2-diphenylvinyl, 1-methylallyl, 1,1-dimethylallyl, 2-methylallyl, 1-phenylallyl, 2-phenylallyl, 3-phenylallyl, 3,3-diphenylallyl, 1,2-dimethylallyl, 1-phenyl-1-butenyl, 3-phenyl-1-butenyl, cyclopentenyl, cyclopentadienyl, cyclohexenyl, cycloheptenyl, cycloheptatrienyl, cyclooctenyl, cyclooctatetraenyl and norbornenyl. Additionally, alkenyl groups may be optionally substituted.

[0042] Alkynyl - as used herein, encompasses straight chain alkynyl. Alkynyl may be an alkynyl containing 2 to 20 carbon atoms, preferably an alkynyl having 2 to 10 carbon atoms. Examples of alkynyl include ethynyl, propynyl, propargyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-pentynyl, 2-pentynyl, 3,3-dimethyl-1-butynyl, 3-ethyl-3-methyl-1-pentynyl, 3,3-diisopropyl-1-pentynyl, phenylethynyl, phenylpropynyl, etc. Among the above, ethynyl, propynyl, propargyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-pentynyl, phenylethynyl, etc. are preferred. In addition, alkynyl may be optionally substituted.

[0043] Aryl or aromatic group - As used herein, both non-fused and fused systems are contemplated. The aryl group may be an aryl group having 6 to 30 carbon atoms, preferably an aryl group having 6 to 20 carbon atoms, and more preferably an aryl group having 6 to 12 carbon atoms. Examples of aryl groups include phenyl, biphenyl, terphenyl, triphenylene, tetraphenylene, naphthalene, anthracene, phenanthrene, fluorene, pyrene, Perylene and azulene, preferably phenyl, biphenyl, terphenyl, triphenylene, fluorene and naphthalene. Examples of non-condensed aryl groups include phenyl, biphenyl-2-yl, biphenyl-3-yl, biphenyl-4-yl, p-terphenyl-4-yl, p-terphenyl-3-yl, p-terphenyl-2-yl, m-terphenyl-4-yl, m-terphenyl-3-yl, m-terphenyl-2-yl, o-tolyl, m-tolyl, p-tolyl, p-(2-phenylpropyl)phenyl, 4'-methylbiphenyl, 4"-tert-butyl-p-terphenyl-4-yl, o-cumyl, m-cumyl, p-cumyl, 2,3-xylyl, 3,4-xylyl, 2,5-xylyl, mesityl and m-quadrenyl. In addition, the aryl group may be optionally substituted.

[0044] Heterocyclic or heterocyclic - as used herein, non-aromatic cyclic groups are contemplated. Non-aromatic heterocyclic groups include saturated heterocyclic groups having 3-20 ring atoms and unsaturated non-aromatic heterocyclic groups having 3-20 ring atoms, wherein at least one ring atom is selected from the group consisting of nitrogen atoms, oxygen atoms, sulfur atoms, selenium atoms, silicon atoms, phosphorus atoms, germanium atoms and boron atoms, and preferred non-aromatic heterocyclic groups are those having 3 to 7 ring atoms, including at least one heteroatom such as nitrogen, oxygen, silicon or sulfur. Examples of non-aromatic heterocyclic groups include oxirane, oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, dioxopentanyl, dioxanyl, aziridinyl, dihydropyrrolyl, tetrahydropyrrolyl, piperidinyl, oxazolidinyl, morpholinyl, piperazinyl, oxepinyl, thiepinyl, azepine and tetrahydrothioxolyl. Additionally, the heterocyclyl group may be optionally substituted.

[0045] Heteroaryl - As used herein, non-fused and fused heteroaromatic groups may contain 1 to 5 heteroatoms, wherein at least one heteroatom is selected from the group consisting of nitrogen, oxygen, sulfur, selenium, silicon, phosphorus, germanium and boron atoms. Heteroaryl also refers to heteroaryl. The heteroaryl may be a heteroaryl having 3 to 30 carbon atoms, preferably a heteroaryl having 3 to 20 carbon atoms, and more preferably a heteroaryl having 3 to 12 carbon atoms. Suitable heteroaryl groups include dibenzothiophene, dibenzofuran, dibenzoselenophene, furan, thiophene, benzofuran, benzothiophene, benzoselenophene, carbazole, indole, carbazole, pyridine, indole, pyrrolopyridine, pyrazole, imidazole, triazole, oxazole, thiazole, oxadiazole, oxatriazole, dioxazole, thiadiazole, pyridine, pyridazine, pyrimidine, pyrazine, triazine, oxazine, oxathiazine, oxadiazine, indole, benzimidazole, indazole, indenozine, benzoxazole, benzisoxazole, benzothiazole, quinoline, isoquinoline, In some embodiments, the heteroaryl group is substituted with 1,2-azaborine, 1,3-azaborine, 1,4-azaborine, borazole and its aza analogs. In some embodiments, the heteroaryl group is substituted with 1,2-azaborine, 1,3-azaborine, 1,4-azaborine, borazole and its aza analogs. In some embodiments, the heteroaryl group is substituted with 1,2-azaborine, 1,3-azaborine, 1,4-azaborine, borazole and its aza analogs. In addition, the heteroaryl group may be optionally substituted.

[0046] Alkoxy-as used herein, represented by -O-alkyl, -O-cycloalkyl, -O-heteroalkyl or -O-heterocyclyl. Examples and preferred examples of alkyl, cycloalkyl, heteroalkyl and heterocyclyl are the same as described above. Alkoxy can be an alkoxy having 1 to 20 carbon atoms, preferably an alkoxy having 1 to 6 carbon atoms. Examples of alkoxy include methoxy, ethoxy, propoxy, butoxy, pentyloxy, hexyloxy, cyclopropyloxy, cyclobutyloxy, cyclopentyloxy, cyclohexyloxy, tetrahydrofuranyloxy, tetrahydropyranyloxy, methoxypropyloxy, ethoxyethyloxy, methoxymethyloxy and ethoxymethyloxy. In addition, alkoxy can be optionally substituted.

[0047] Aryloxy - as used herein, represented by -O-aryl or -O-heteroaryl. Examples and preferred examples of aryl and heteroaryl are the same as above. Aryloxy can be an aryloxy having 6 to 30 carbon atoms, preferably an aryloxy having 6 to 20 carbon atoms. Examples of aryloxy include phenoxy and biphenyloxy. In addition, aryloxy can be optionally substituted.

[0048] Aralkyl - as used herein, encompasses aryl-substituted alkyl groups. Aralkyl groups may be aralkyl groups having 7 to 30 carbon atoms, preferably aralkyl groups having 7 to 20 carbon atoms, and more preferably aralkyl groups having 7 to 13 carbon atoms. Examples of aralkyl groups include benzyl, 1-phenylethyl, 2-phenylethyl, 1-phenylisopropyl, 2-phenylisopropyl, phenyl tert-butyl, α-naphthylmethyl, 1-α-naphthyl-ethyl, 2-α-naphthylethyl, 1-α-naphthylisopropyl, 2-α-naphthylisopropyl, β-naphthylmethyl, 1-β-naphthyl-ethyl, 2-β-naphthyl-ethyl, 1-β-naphthylisopropyl, 2-β-naphthylisopropyl, p-methylbenzyl, m-methylbenzyl, substituted alkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl,

[0049] Alkylsilyl - As used herein, alkyl substituted silicon groups are contemplated. The alkylsilyl group may be an alkylsilyl group having 3-20 carbon atoms, preferably an alkylsilyl group having 3 to 10 carbon atoms. Examples of alkylsilyl groups include trimethylsilyl, triethylsilyl, methyldiethylsilyl, ethyldimethylsilyl, tripropylsilyl, tributylsilyl, triisopropylsilyl, methyldiisopropylsilyl, dimethylisopropylsilyl, tri-tert-butylsilyl, triisobutylsilyl, dimethyltert-butylsilyl, methyldi-tert-butylsilyl. In addition, the alkylsilyl group may be optionally substituted.

[0050] Arylsilyl - as used herein, encompasses at least one aryl-substituted silicon group. The arylsilyl group may be an arylsilyl group having 6 to 30 carbon atoms, preferably an arylsilyl group having 8 to 20 carbon atoms. Examples of arylsilyl groups include triphenylsilyl, phenyldiphenylsilyl, diphenylbiphenylsilyl, phenyldiethylsilyl, diphenylethylsilyl, phenyldimethylsilyl, diphenylmethylsilyl, phenyldiisopropylsilyl, diphenylisopropylsilyl, diphenylbutylsilyl, diphenylisobutylsilyl, diphenyltert-butylsilyl. In addition, the arylsilyl group may be optionally substituted.

[0051] Alkylgermanyl - As used herein, alkyl substituted germanyl is contemplated. The alkylgermanyl may be an alkylgermanyl having 3-20 carbon atoms, preferably an alkylgermanyl having 3 to 10 carbon atoms. Examples of alkylgermanyl include trimethylgermanyl, triethylgermanyl, methyldiethylgermanyl, ethyldimethylgermanyl, tripropylgermanyl, tributylgermanyl, triisopropylgermanyl, methyldiisopropylgermanyl, dimethylisopropylgermanyl, tri-tert-butylgermanyl, triisobutylgermanyl, dimethyltert-butylgermanyl, methyldi-tert-butylgermanyl. In addition, the alkylgermanyl may be optionally substituted.

[0052] Arylgermanyl - as used herein, encompasses germanyl substituted with at least one aryl or heteroaryl group. The arylgermanyl may be an arylgermanyl having 6 to 30 carbon atoms, preferably an arylgermanyl having 8 to 20 carbon atoms. Examples of arylgermanyl include triphenylgermanyl, phenyldibiphenylgermanyl, diphenylbiphenylgermanyl, phenyldiethylgermanyl, diphenylethylgermanyl, phenyldimethylgermanyl, diphenylmethylgermanyl, phenyldiisopropylgermanyl, diphenylisopropylgermanyl, diphenylbutylgermanyl, diphenylisobutylgermanyl, diphenyltert-butylgermanyl. In addition, the arylgermanyl may be optionally substituted.

[0053] The term "aza" in azadibenzofuran, azadibenzothiophene, etc. means that one or more CH groups in the corresponding aromatic fragment are replaced by a nitrogen atom. For example, azatriphenylene includes dibenzo[f,h]quinoxaline, dibenzo[f,h]quinoline and other analogs having two or more nitrogens in the ring system. Other nitrogen analogs of the above-mentioned aza derivatives can be easily thought of by those of ordinary skill in the art, and all such analogs are determined to be included in the terms described herein.

[0054] In the present disclosure, unless otherwise defined, when any one of the terms in the group consisting of substituted alkyl, substituted cycloalkyl, substituted heteroalkyl, substituted heterocyclyl, substituted aralkyl, substituted alkoxy, substituted aryloxy, substituted alkenyl, substituted alkynyl, substituted aryl, substituted heteroaryl, substituted alkylsilyl, substituted arylsilyl, substituted alkylgermanyl, substituted arylgermanyl, substituted amino, substituted acyl, substituted carbonyl, substituted carboxylic acid , substituted ester, substituted sulfinyl, substituted sulfonyl, substituted phosphino, refers to alkyl, cycloalkyl, heteroalkyl, heterocyclic, aralkyl, alkoxy, aryloxy, alkenyl, alkynyl, aryl, heteroaryl, alkylsilyl, arylsilyl, alkylgermanyl, arylgermanyl, amino, acyl, carbonyl, carboxylic acid, ester, sulfinyl, sulfonyl and phosphino, any one of which may be selected from deuterium, halogen, unsubstituted alkyl having 1 to 20 carbon atoms, unsubstituted cycloalkyl having 3-20 ring carbon atoms, unsubstituted heteroalkyl having 1-20 carbon atoms, unsubstituted heterocyclyl having 3-20 ring atoms, unsubstituted aralkyl having 7-30 carbon atoms, unsubstituted alkoxy having 1-20 carbon atoms, unsubstituted aryloxy having 6-30 carbon atoms, unsubstituted alkenyl having 2-20 carbon atoms, unsubstituted alkynyl having 2-20 carbon atoms, unsubstituted cycloalkyl having 6-30 carbon atoms, unsubstituted cycloalkyl having 2-2 ... Aryl, unsubstituted heteroaryl having 3-30 carbon atoms, unsubstituted alkylsilyl having 3-20 carbon atoms, unsubstituted arylsilyl having 6-20 carbon atoms, unsubstituted alkylgermanyl having 3-20 carbon atoms, unsubstituted arylgermanyl having 6-20 carbon atoms, unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, mercapto, sulfinyl, sulfonyl, phosphino and combinations thereof.

[0055] It should be understood that when describing a molecular fragment as a substituent or otherwise attached to another moiety, its name can be written according to whether it is a fragment (e.g., phenyl, phenylene, naphthyl, dibenzofuranyl) or according to whether it is a whole molecule (e.g., benzene, naphthalene, dibenzofuran). As used herein, these different ways of specifying a substituent or attaching a fragment are considered equivalent.

[0056] In the compounds mentioned in this disclosure, hydrogen atoms may be partially or completely replaced by deuterium. Other atoms such as carbon and nitrogen may also be replaced by their other stable isotopes. The replacement of other stable isotopes in the compounds may be preferred because it enhances the efficiency and stability of the device.

[0057] In the compounds mentioned in the present disclosure, multiple substitution refers to the range including disubstitution up to the maximum number of available substitutions. When a substituent in the compounds mentioned in the present disclosure represents multiple substitutions (including disubstitution, trisubstitution, tetrasubstitution, etc.), it means that the substituent can exist in multiple available substitution positions on its connection structure, and the substituents existing in multiple available substitution positions can be of the same structure or different structures.

[0058] In the compounds mentioned in the present disclosure, unless clearly defined, for example, adjacent substituents can be optionally connected to form a ring, otherwise adjacent substituents in the compound cannot be connected to form a ring. In the compounds mentioned in the present disclosure, adjacent substituents can be optionally connected to form a ring, including both the situation where adjacent substituents can be connected to form a ring and the situation where adjacent substituents are not connected to form a ring. When adjacent substituents can be optionally connected to form a ring, the formed ring can be a monocyclic or polycyclic ring (including spirocyclic, bridged ring, condensed ring, etc.), as well as an alicyclic, heteroalicyclic, aromatic or heteroaromatic ring. In this statement, adjacent substituents can refer to substituents bonded to the same atom, substituents bonded to carbon atoms directly bonded to each other, or substituents bonded to carbon atoms further away. Preferably, adjacent substituents refer to substituents bonded to the same carbon atom and substituents bonded to carbon atoms directly bonded to each other.

[0059] The expression that adjacent substituents can be optionally linked to form a ring is also intended to be taken to mean that two substituents bonded to the same carbon atom are linked to each other by a chemical bond to form a ring, which can be exemplified by the following formula:

[0060]

[0061] The expression that adjacent substituents can be optionally linked to form a ring is also intended to be taken to mean that two substituents bonded to carbon atoms directly bonded to each other are linked to each other by a chemical bond to form a ring, which can be exemplified by the following formula:

[0062]

[0063] The expression that adjacent substituents can be optionally linked to form a ring is also intended to be taken to mean that two substituents bonded to a further distant carbon atom are linked to each other by a chemical bond to form a ring, which can be exemplified by the following formula:

[0064]

[0065] Furthermore, the statement that adjacent substituents can optionally be linked to form a ring is also intended to be taken to mean that, in the case where one of the two adjacent substituents represents hydrogen, the second substituent is bonded at the position to which the hydrogen atom is bonded, thereby forming a ring. This is exemplified by the following formula:

[0066]

[0067] According to one embodiment of the present invention, an organic electroluminescent device is disclosed, comprising:

[0068] anode,

[0069] cathode,

[0070] and a light-emitting layer disposed between the anode and the cathode, the light-emitting layer comprising at least a first metal complex and a second metal complex, wherein the first metal complex and the second metal complex are different, the maximum emission wavelengths of the photoluminescence spectra of the first metal complex and the second metal complex are both greater than or equal to 590 nm; and the first metal complex and the second metal complex at least meet any one or two of the following conditions:

[0071] (1) The difference in the maximum emission wavelengths of the photoluminescence spectra of the first metal complex and the second metal complex is greater than 0 nm and less than or equal to 20 nm;

[0072] (2) The difference in relative molecular weight between the first metal complex and the second metal complex is less than or equal to 50.

[0073] According to one embodiment of the present invention, an organic electroluminescent device is disclosed, comprising:

[0074] anode,

[0075] cathode,

[0076] and a light-emitting layer disposed between the anode and the cathode, the light-emitting layer comprising at least a first metal complex and a second metal complex, wherein the first metal complex and the second metal complex are different, the maximum emission wavelengths of the photoluminescence spectra of the first metal complex and the second metal complex are both greater than or equal to 590 nm; and the first metal complex and the second metal complex simultaneously satisfy the following conditions:

[0077] (1) The difference in the maximum emission wavelengths of the photoluminescence spectra of the first metal complex and the second metal complex is greater than 0 nm and less than or equal to 20 nm;

[0078] (2) The difference in relative molecular weight between the first metal complex and the second metal complex is less than or equal to 50.

[0079] According to one embodiment of the present invention, the maximum emission wavelengths of the photoluminescence spectra of the first metal complex and the second metal complex are between 590 nm and 640 nm.

[0080] According to one embodiment of the present invention, the maximum emission wavelengths of the photoluminescence spectra of the first metal complex and the second metal complex are between 610 nm and 640 nm.

[0081] According to one embodiment of the present invention, the difference in maximum emission wavelengths between the photoluminescence spectra of the first metal complex and the second metal complex is greater than 0 nm and less than or equal to 10 nm.

[0082] According to one embodiment of the present invention, the difference in maximum emission wavelengths between the photoluminescence spectra of the first metal complex and the second metal complex is greater than 0 nm and less than or equal to 7 nm.

[0083] According to one embodiment of the present invention, the difference in maximum emission wavelengths between the photoluminescence spectra of the first metal complex and the second metal complex is greater than or equal to 3 nm and less than or equal to 10 nm.

[0084] According to one embodiment of the present invention, the difference in maximum emission wavelengths between the photoluminescence spectra of the first metal complex and the second metal complex is greater than or equal to 3 nm and less than or equal to 7 nm.

[0085] According to one embodiment of the present invention, the difference in relative molecular mass between the first metal complex and the second metal complex is less than or equal to 40.

[0086] According to one embodiment of the present invention, the difference in relative molecular mass between the first metal complex and the second metal complex is less than or equal to 30.

[0087] According to one embodiment of the present invention, the first metal complex and the second metal complex differ by one or two sp 3 Carbon atom.

[0088] According to one embodiment of the present invention, an organic electroluminescent device is disclosed, comprising:

[0089] anode,

[0090] cathode,

[0091] And a light-emitting layer arranged between the anode and the cathode, the light-emitting layer at least comprises a first metal complex, a second metal complex and a third metal complex, the first metal complex, the second metal complex and the third metal complex are different from each other, the maximum emission wavelength of the photoluminescence spectrum of the first metal complex, the second metal complex and the third metal complex is greater than or equal to 590nm; and the first metal complex, the second metal complex and the third metal complex at least meet any one or two of the following conditions:

[0092] (1) The difference in the maximum emission wavelengths of the photoluminescence spectra of any two of the first metal complex, the second metal complex and the third metal complex is greater than 0 nm and less than or equal to 20 nm;

[0093] (2) The difference in relative molecular weights between any two of the first metal complex, the second metal complex and the third metal complex is less than or equal to 50.

[0094] According to one embodiment of the present invention, the maximum emission wavelength of the photoluminescence spectra of the first metal complex, the second metal complex and the third metal complex is between 590 nm and 640 nm.

[0095] According to one embodiment of the present invention, the maximum emission wavelength of the photoluminescence spectra of the first metal complex, the second metal complex and the third metal complex is between 610 nm and 640 nm.

[0096] According to one embodiment of the present invention, the difference in maximum emission wavelengths of the photoluminescence spectra of any two metal complexes among the first metal complex, the second metal complex and the third metal complex is greater than 0 nm and less than or equal to 10 nm.

[0097] According to one embodiment of the present invention, the difference in maximum emission wavelengths of the photoluminescence spectra of any two metal complexes among the first metal complex, the second metal complex and the third metal complex is greater than 0 nm and less than or equal to 7 nm.

[0098] According to one embodiment of the present invention, the difference in maximum emission wavelengths of the photoluminescence spectra of any two metal complexes among the first metal complex, the second metal complex and the third metal complex is greater than or equal to 3 nm and less than or equal to 10 nm.

[0099] According to one embodiment of the present invention, the difference in maximum emission wavelengths of the photoluminescence spectra of any two metal complexes among the first metal complex, the second metal complex and the third metal complex is greater than or equal to 3 nm and less than or equal to 7 nm.

[0100] According to one embodiment of the present invention, the difference in relative molecular weights between any two metal complexes among the first metal complex, the second metal complex and the third metal complex is less than or equal to 40.

[0101] According to one embodiment of the present invention, the difference in relative molecular weights between any two metal complexes among the first metal complex, the second metal complex and the third metal complex is less than or equal to 30.

[0102] According to one embodiment of the present invention, the first metal complex and the second metal complex each independently comprise a metal M and a ligand L coordinated with M. a , the metal is selected from metals with a relative atomic mass greater than 40, the ligand L a Contains at least one fused ring structure.

[0103] According to one embodiment of the present invention, the first metal complex, the second metal complex and the third metal complex each independently comprise a metal M and a ligand L coordinated with M. a , the metal is selected from metals with a relative atomic mass greater than 40, the ligand L a Contains at least one fused ring structure.

[0104] According to one embodiment of the present invention, the condensed ring structure is an aromatic condensed ring structure.

[0105] According to one embodiment of the present invention, the ligand L a The at least one condensed ring structure comprises an aza six-membered ring connected to the metal M via a nitrogen atom.

[0106] In this article, the "condensed ring structure" is intended to mean a structure formed by the fusion of at least two rings; "the at least one condensed ring structure comprises an aza six-membered ring connected to the metal M via a nitrogen atom" is intended to mean that the at least one condensed ring structure comprises an aza six-membered ring, and the ligand L a The metal M is connected to the nitrogen atom in the aza six-membered ring.

[0107] According to one embodiment of the present invention, the ligand L a Having a structure represented by Formula 1 or Formula 2:

[0108]

[0109] Wherein, in Formula 1, Ring A and Ring B are each independently selected from a five-membered unsaturated carbocyclic ring, an aromatic ring having 6 to 30 carbon atoms, or a heteroaromatic ring having 3 to 30 carbon atoms; R i Each occurrence of R is the same or different, indicating mono-, poly- or unsubstituted; ii Each occurrence is identical or different and indicates mono-, poly-, or unsubstituted;

[0110] Y is selected from SiR y R y ,GeR y R y , NR y , P.R. y , O, S or Se; when there are two R yWhen two R y Same or different;

[0111] X1-X2 are selected from CR in the same or different ways each time they appear x or N;

[0112] In Formula 2, X3-X6 are selected from CR i or N;

[0113] Each occurrence of A1-A6 is selected from CR ii or N;

[0114] V1 and V2 are each independently selected from C or N, and V1 and V2 are different;

[0115] R, R i , R ii , R x and R y 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 amine 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;

[0116] Adjacent substituents R, R i , R ii , R x and R y Can optionally be linked to form a ring.

[0117] In this embodiment, “adjacent substituents R, R i , R ii , R x and R y"can optionally be linked to form a ring" is intended to mean that adjacent groups of substituents, for example, adjacent substituents R i Between adjacent substituents R ii Between adjacent substituents R x Between adjacent substituents R y Between adjacent substituents R i and R x Between adjacent substituents R i and R y Between adjacent substituents R and R y Between, and between adjacent substituents R and R ii In between, any one or more of these substituent groups can be connected to form a ring. Obviously, these substituent groups can also not be connected to form a ring.

[0118] According to one embodiment of the present invention, ring A and ring B are each independently selected from a five-membered unsaturated carbocyclic ring, an aromatic ring having 6 to 18 carbon atoms, or a heteroaromatic ring having 3 to 18 carbon atoms.

[0119] According to one embodiment of the present invention, ring A or ring B is each independently selected from a five-membered unsaturated carbon ring, an aromatic ring having 6 to 18 carbon atoms, or a heteroaromatic ring having 3 to 18 carbon atoms.

[0120] According to one embodiment of the present invention, ring A and / or ring B are each independently selected from a five-membered unsaturated carbocyclic ring, an aromatic ring having 6-10 carbon atoms or a heteroaromatic ring having 3-10 carbon atoms.

[0121] According to one embodiment of the present invention, ring A or ring B is each independently selected from a five-membered unsaturated carbon ring, an aromatic ring having 6-10 carbon atoms or a heteroaromatic ring having 3-10 carbon atoms.

[0122] According to one embodiment of the present invention, the ligand L a A structure selected from any one of Formula 1-1 to Formula 1-13, Formula 2-1 to Formula 2-2:

[0123]

[0124]

[0125] in,

[0126] X1-X2 are selected from CR in the same or different ways each time they appear x or N; X3-X7 are selected from CR in the same or different manner each time they appear i or N; A1-A6 are selected from CR in the same or different manner each time they appear ii or N;

[0127] Each time Z appears, it is selected from CR iii R iii ,SiR iii R iii , P.R. iii , O, S or NR iii ; When there are two R iii When two R iii Same or different;

[0128] Y is selected from SiR y R y , NR y , P.R. y , O, S or Se; when there are two R y When two R y Same or different;

[0129] R, R x , R y , R i , R ii and R iii 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 amine 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;

[0130] Adjacent substituents R, R x , R y , R i , R ii and R iii Can optionally be linked to form a ring.

[0131] In this embodiment, "the adjacent substituents R, Rx , R y , R i , R ii and R iii "can optionally be linked to form a ring" is intended to mean that adjacent groups of substituents, for example, adjacent substituents R x Between adjacent substituents R y Between adjacent substituents R i Between adjacent substituents R ii Between adjacent substituents R iii Between adjacent substituents R i and R x Between adjacent substituents R i and R y Between adjacent substituents R and R y Between adjacent substituents R and R ii Between adjacent substituents R ii and R iii Between, and between adjacent substituents R and R iii In between, any one or more of these substituent groups can be connected to form a ring. Obviously, these substituent groups can also not be connected to form a ring.

[0132] According to one embodiment of the present invention, the ligand L a A structure selected from the group consisting of the structures represented by Formula 1-1 and Formula 1-7.

[0133] According to one embodiment of the present invention, the ligand L a Select the structure represented by Formula 1-7.

[0134] According to one embodiment of the present invention, X1-X n and / or A1-A m At least one of the X is selected from N, n Corresponding to the X1-X7 with the largest sequence number in any of Formulas 1-1 to 1-13, 2-1 to 2-2, the A m The corresponding A1-A6 in any of Formulas 1-1 to 1-13, 2-1 to 2-2 has the largest sequence number; for example, for Formula 1-1, the X n Corresponding to the largest number X5 among X1-X7 in Formula 1-1, A m Corresponding to the largest serial number A4 among A1-A6 in Formula 1-1, that is, in Formula 1-1, at least one of X1-X5 and / or A1-A4 is selected from N.

[0135] According to one embodiment of the present invention, X1-X nAt least one of the X is selected from N, n The corresponding X1-X7 has the largest serial number in any one of Formulas 1-1 to 1-13, 2-1 to 2-2.

[0136] According to one embodiment of the present invention, X2 is N.

[0137] According to one embodiment of the present invention, in Formulas 1-1 to 1-13, Formulas 2-1 to 2-2, X1 to X2 are each independently selected from CR x ; X3-X7 are each independently selected from CR i ; A1-A6 are each independently selected from CR ii ; Adjacent substituent R x , R i , R ii Can optionally be linked to form a ring.

[0138] According to one embodiment of the present invention, wherein the R x , R i , R ii Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, cyano, and combinations thereof.

[0139] According to one embodiment of the present invention, wherein the R x , R i , R ii At least two or three of the following are selected, at each occurrence, identically or differently, from the group consisting of deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, cyano, and combinations thereof.

[0140] According to one embodiment of the present invention, in Formulas 1-1 to 1-6 and 2-1 to 2-2, X4 is selected from CR i In Formula 1-7 to Formula 1-11, X7 is selected from CR i ;

[0141] And the R iEach occurrence is identically or differently selected from hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilanyl having 6 to 20 carbon atoms, cyano, or a combination thereof.

[0142] According to one embodiment of the present invention, wherein the R i Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, fluorine, methyl, ethyl, isopropyl, isobutyl, tert-butyl, neopentyl, cyclopentyl, cyclopentylmethyl, cyclohexyl, norbornyl, adamantyl, trimethylsilyl, isopropyldimethylsilyl, phenyldimethylsilyl, trifluoromethyl, cyano, phenyl, and combinations thereof.

[0143] According to one embodiment of the present invention, wherein, in Formula 1-1 to Formula 1-13, R is selected from hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, or a combination thereof.

[0144] According to one embodiment of the present invention, wherein R is selected from hydrogen, deuterium, fluorine, methyl, ethyl, isopropyl, isobutyl, tert-butyl, cyclopentyl, cyclopentylmethyl, cyclohexyl, neopentyl, deuterated methyl, deuterated ethyl, deuterated isopropyl, deuterated isobutyl, deuterated tert-butyl, deuterated cyclopentyl, deuterated cyclopentylmethyl, deuterated cyclohexyl, deuterated neopentyl, trimethylsilyl, or a combination thereof.

[0145] According to one embodiment of the present invention, Y is selected from O or S.

[0146] According to one embodiment of the present invention, wherein Y is O.

[0147] According to one embodiment of the present invention, wherein Y is S.

[0148] According to one embodiment of the present invention, X1 and X2 are each independently selected from CR x .

[0149] According to one embodiment of the present invention, wherein the R xEach occurrence is identically or differently selected from hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, or a combination thereof.

[0150] According to one embodiment of the present invention, X1 is selected from CR x , X2 is N.

[0151] According to one embodiment of the present invention, wherein the R x is selected from hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, or a combination thereof.

[0152] According to one embodiment of the present invention, the ligand L a Having a structure represented by Formula 3, Formula 4 or Formula 5:

[0153]

[0154] in,

[0155] Y is selected from O or S;

[0156] R x1 , R x2 , R i1 , R i2 , R i3 , R ii1 , R ii2 , R ii3 , R ii4 , R ii5 , R ii6 , R iii1 , R iii2 , R iii3 , R iii4each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, and combinations thereof;

[0157] R is selected, at each occurrence, identically or differently, from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted amine having 0-20 carbon atoms, and combinations thereof.

[0158] According to one embodiment of the present invention, R x1 , R x2 , R i1 , R i2 , R i3 , R iii3 , R iii4 Neutralize and / or R ii1 , R ii2 , R ii3 , R ii4 , R ii5 , R ii6 At least one or two of them are selected, at each occurrence, identically or differently, from deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, or a combination thereof; R is selected from halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, or a combination thereof.

[0159] According to one embodiment of the present invention, R x1 , R x2 , Ri1 , R i2 , R i3 , R iii3 , R iii4 Neutralize and / or R ii1 , R ii2 , R ii3 , R ii4 , R ii5 , R ii6 At least one or two of them are selected, at each occurrence, the same or different, from substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, or a combination thereof; R is selected from substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, or a combination thereof.

[0160] According to one embodiment of the present invention, R i2 and R iii4 R is selected from the group consisting of: deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, or a combination thereof; R is selected from the group consisting of: halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, or a combination thereof; R ii1 , R ii2 , R ii3 , R ii4At least one or two of them are selected, at each occurrence, identically or differently, from deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, or a combination thereof.

[0161] According to one embodiment of the present invention, R i2 and R iii4 R is selected from the group consisting of: substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, or a combination thereof; R is selected from the group consisting of substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, or a combination thereof; R ii1 , R ii2 , R ii3 , R ii4 At least one or two of the above are selected, at each occurrence, identically or differently, from a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, or a combination thereof.

[0162] According to one embodiment of the present invention, R x1 , R x2 , R i1 , R i2 , R i3 , R ii1 , R ii2 , R ii3 , R ii4 , R iii3 , R iii4, at least one of R is selected, at each occurrence, identically or differently, from the group consisting of: substituted or unsubstituted alkyl having 3-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, and combinations thereof.

[0163] According to one embodiment of the present invention, R x1 , R x2 , R i1 , R i2 , R i3 , R ii1 , R ii2 , R ii3 , R ii4 , R iii3 , R iii4 , at least one of R is selected, at each occurrence, identically or differently, from the group consisting of substituted or unsubstituted alkyl having 3 to 10 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 10 ring carbon atoms, and combinations thereof.

[0164] According to one embodiment of the present invention, the ligand L a Each time it appears, choose the same or different one from L a1 To L a634 A group consisting of, wherein the L a1 To L a634 For the specific structure, please refer to claim 14.

[0165] According to one embodiment of the present invention, the first metal complex and the second metal complex have M(L a ) m (L b ) n (L c ) q structure;

[0166] Wherein, the metal M is selected from metals with a relative atomic mass greater than 40; L a , L b and L c are the first ligand, the second ligand and the third ligand of the complex respectively; m is 1, 2 or 3, n is 0, 1 or 2, q is 0, 1 or 2, m+n+q is equal to the oxidation state of the metal M; when m is greater than 1, multiple L a The same or different; when n is 2, the two L b The same or different; when q is 2, the two L c Same or different;

[0167] L a , L b and L ccan optionally be linked to form a multidentate ligand;

[0168] L b and L c Each occurrence is identically or differently selected from the group consisting of:

[0169]

[0170] Among them, R a , R b and R c Each occurrence is identical or different and indicates mono-, poly-, or unsubstituted;

[0171] X b Each occurrence is identically or differently selected from the group consisting of: O, S, Se, NR N1 and CR C1 R C2 ;

[0172] X c and X d Each occurrence is identically or differently selected from the group consisting of: O, S, Se and NR N2 ;

[0173] R a , R b , R c , R N1 , R N2 , R C1 and R C2 The alkyl radicals are selected, at each occurrence, identically or differently, from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl radicals having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl radicals having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl radicals having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl radicals having 3 to 20 ring atoms, substituted or unsubstituted aralkyl radicals having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy radicals having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy radicals having 6 to 30 carbon atoms, substituted or unsubstituted alkene radicals having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted alkylgermanyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylgermanyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amine 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;

[0174] Among them, the adjacent substituent R a , R b , R c , R N1 , R N2 , R C1 and R C2 Can optionally be linked to form a ring.

[0175] In this context, adjacent substituents R a , R b , R c , R N1 , R N2 , R C1 and R C2 can be optionally linked to form a ring, which is intended to represent adjacent substituent groups, for example, two substituents R a Between the two substituents R b Between the two substituents R c Between, the substituent R a and R b Between, the substituent R a and R c Between, the substituent R b and R c Between, the substituent R a and R N1 Between, the substituent R b and R N1 Between, the substituent R a and R C1 Between, the substituent R a and R C2 Between, the substituent R b and R C1 Between, the substituent R b and R C2 Between, the substituent R a and R N2 Between, the substituent R b and R N2 Between, and R C1 and R C2 Any one or more of these substituent groups may be linked to form a ring. For example, The adjacent substituent R a , R b Can be optionally linked to form a ring, which can form one or more of the following structures including but not limited to:

[0176] Wherein W is selected from O, S, Se, NR' or CR'R'; wherein R', R a ', Rb ' is defined in the same way as R a Obviously, these substituents may not be connected to form a ring.

[0177] According to one embodiment of the present invention, the first metal complex, the second metal complex and the third metal complex have M(L a ) m (L b ) n (L c ) q structure;

[0178] Wherein, the metal M is selected from metals with a relative atomic mass greater than 40; L a , L b and L c are the first ligand, the second ligand and the third ligand of the complex respectively; m is 1, 2 or 3, n is 0, 1 or 2, q is 0, 1 or 2, m+n+q is equal to the oxidation state of the metal M; when m is greater than 1, multiple L a The same or different; when n is 2, the two L b The same or different; when q is 2, the two L c Same or different;

[0179] L a , L b and L c can optionally be linked to form a multidentate ligand;

[0180] L b and L c Each occurrence is identically or differently selected from the group consisting of:

[0181]

[0182]

[0183] Among them, R a , R b and R c Each occurrence is identical or different and indicates mono-, poly-, or unsubstituted;

[0184] X b Each occurrence is identically or differently selected from the group consisting of: O, S, Se, NR N1 and CR C1 R C2 ;

[0185] X c and X d Each occurrence is identically or differently selected from the group consisting of: O, S, Se and NRN2 ;

[0186] R a , R b , R c , R N1 , R N2 , R C1 and R C2 The alkyl radicals are selected, at each occurrence, identically or differently, from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl radicals having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl radicals having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl radicals having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl radicals having 3 to 20 ring atoms, substituted or unsubstituted aralkyl radicals having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy radicals having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy radicals having 6 to 30 carbon atoms, substituted or unsubstituted alkene radicals having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted alkylgermanyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylgermanyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amine 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;

[0187] Among them, the adjacent substituent R a , R b , R c , R N1 , R N2 , R C1 and R C2 Can optionally be linked to form a ring.

[0188] According to one embodiment of the present invention, the metal M is selected from Ir, Rh, Re, Os, Pt, Au or Cu.

[0189] According to one embodiment of the present invention, the metal M is selected from Ir, Pt or Os.

[0190] According to an embodiment of the present invention, the metal M is Ir.

[0191] According to one embodiment of the present invention, wherein L b Each occurrence is identically or differently selected from the following structures:

[0192]

[0193] wherein R1-R7 are selected, at each occurrence, identically or differently, from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 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 2-20 carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanyl groups having 3-20 carbon atoms, substituted or unsubstituted arylgermanyl groups having 6-20 carbon atoms, substituted or unsubstituted amine groups having 0-20 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;

[0194] Adjacent substituents R1, R2, R3, R4, R5, R6, R7 can be optionally linked to form a ring.

[0195] In this embodiment, "adjacent substituents R1, R2, R3, R4, R5, R6, R7 can be optionally connected to form a ring" is intended to mean that adjacent substituent groups, for example, between substituents R1 and R2, between substituents R1 and R3, between substituents R2 and R3, between substituents R4 and R5, between substituents R4 and R6, between substituents R5 and R6, between substituents R1 and R7, between substituents R2 and R7, between substituents R3 and R7, between substituents R4 and R7, between substituents R5 and R7, and between substituents R6 and R7, any one or more of these substituent groups can be connected to form a ring. Obviously, these substituents may not be connected to form a ring.

[0196] According to one embodiment of the present invention, at least one or two of R1-R3 are selected from substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, or combinations thereof, the same or different each time they appear; and / or at least one or two of R4-R6 are selected from substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, or combinations thereof, the same or different each time they appear.

[0197] According to one embodiment of the present invention, at least two of R1-R3 are selected from substituted or unsubstituted alkyl groups having 2-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 2-20 carbon atoms, or combinations thereof, the same or different at each occurrence; and / or at least two of R4-R6 are selected from substituted or unsubstituted alkyl groups having 2-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 2-20 carbon atoms, or combinations thereof, the same or different at each occurrence.

[0198] According to one embodiment of the present invention, L b Each time it appears, choose the same or different one from L b1 To L b322 The group consisting of L b1 To L b322 For the specific structure, please refer to claim 18.

[0199] According to one embodiment of the present invention, L c Each time it appears, choose the same or different one from L c1 To L c231 The group consisting of L c1 To L c231 For the specific structure, please refer to claim 18.

[0200] According to one embodiment of the present invention, the first metal complex and the second metal complex each independently have Ir(L a )2(L b ) or Ir(L a )2(L c ) or Ir(L a )(L c )2 or Ir(L a )(L b )(L c ) structure;

[0201] Wherein, when the first metal complex and the second metal complex have Ir(L a )2(L b ) structure, L a Each time it appears, choose the same or different one from L a1 To L a634 Any one or two of the group consisting of L b Choose from L b1 To L b322 When the first metal complex and the second metal complex have Ir(La )2(L c ) structure, L a Each time it appears, choose the same or different one from L a1 To L a634 Any one or two of the group consisting of L c Choose from L c1 To L c231 When the first metal complex and the second metal complex have Ir(L a )(L c )2 structure, L a Choose from L a1 To L a634 Any of the groups consisting of L c Each time it appears, choose the same or different one from L c1 To L c231 When the first metal complex and the second metal complex have Ir(L a )(L b )(L c ) structure, the L a Choose from L a1 To L a634 Any one of the group consisting of b Choose from L b1 To L b322 Any one of the group consisting of c Choose from L c1 To L c231 Any of the groups consisting of.

[0202] According to one embodiment of the present invention, the first metal complex, the second metal complex and the third metal complex each independently have Ir(L a )2(L b ) or Ir(L a )2(L c ) or Ir(L a )(L c )2 or Ir(L a )(L b )(L c ) structure;

[0203] Wherein, when the first metal complex, the second metal complex and the third metal complex have Ir(L a )2(L b ) structure, L a Each time it appears, choose the same or different one from L a1 To L a634 Any one or two of the group consisting of Lb Choose from L b1 To L b322 When the first metal complex, the second metal complex and the third metal complex have Ir (L a )2(L c ) structure, L a Each time it appears, choose the same or different one from L a1 To L a634 Any one or two of the group consisting of L c Choose from L c1 To L c231 When the first metal complex, the second metal complex and the third metal complex have Ir (L a )(L c )2 structure, L a Choose from L a1 To L a634 Any of the groups consisting of L c Each time it appears, choose the same or different one from L c1 To L c231 When the first metal complex, the second metal complex and the third metal complex have Ir(L a )(L b )(L c ) structure, the L a Choose from L a1 To L a634 Any one of the group consisting of b Choose from L b1 To L b322 Any one of the group consisting of c Choose from L c1 To L c231 Any of the groups consisting of.

[0204] According to one embodiment of the present invention, the first metal complex and the second metal complex are each independently selected from the group consisting of Compound 1 to Compound 280; the specific structures of Compound 1 to Compound 280 are shown in claim 19.

[0205] According to one embodiment of the present invention, the first metal complex, the second metal complex and the third metal complex are each independently selected from the group consisting of Compound 1 to Compound 280; the specific structures of Compound 1 to Compound 280 refer to Claim 19.

[0206] According to one embodiment of the present invention, the hydrogen in the structures of Compounds 1 to 280 can be partially or completely replaced by deuterium.

[0207] According to one embodiment of the present invention, the first metal complex and the second metal complex have the same skeleton structure, but different substituents on the skeleton.

[0208] In this embodiment, “the first metal complex and the second metal complex have the same skeleton structure, but different substituents on the skeleton” is intended to indicate that the first metal complex and the second metal complex contain the same metal M, and the ligand L a , L b , L c The number and skeleton structure of the first metal complex and the second metal complex are the same, and the difference is only the substituent on the skeleton. For example, the first metal complex and the second metal complex both have Ir(L a )2(L b ) structure, wherein the ligand L a With formula 3 The structure of ligand L b With In this case, the ligands L of the first metal complex and the second metal complex are a Have the same skeleton structure Ligand L b Have the same skeleton structure The only difference is that the ligand L a The substituent R x1 , R x2 , R i1 , R i2 , R i3 , R ii1 , R ii2 , R ii3 , R ii4 , R and / or ligand L b The substituents R1-R7 are different; if the ligands L of the first metal complex and the second metal complex a When Y in the skeleton is selected from O and S respectively, the skeleton structures of the first metal complex and the second metal complex are also the same. At this time, if the first metal complex and the second metal complex also satisfy the difference in maximum emission wavelength less than or equal to 20nm or the difference in relative molecular mass less than or equal to 50, the electroluminescent device whose light-emitting layer comprises the first metal complex and the second metal complex is also the electroluminescent device of the present invention. For metal complexes with other skeleton structures, the same is true.

[0209] According to one embodiment of the present invention, the first metal complex, the second metal complex and the third metal complex have the same skeleton structure, and the substituents on the skeleton are different from each other.

[0210] According to one embodiment of the present invention, the molecular formula difference between the first metal complex and the second metal complex is CH2, (CH2)2, wherein hydrogen can be partially or completely replaced by deuterium.

[0211] According to one embodiment of the present invention, the difference between the first metal complex and the second metal complex is only that the substituents are hydrogen / deuterium, hydrogen / methyl, and methyl / deuterated methyl.

[0212] According to one embodiment of the present invention, the first metal complex and the second metal complex are not meridiform or fac-form isomers.

[0213] According to one embodiment of the present invention, any two metal complexes among the first metal complex, the second metal complex and the third metal complex are not meridiform or fac-form isomers.

[0214] According to one embodiment of the present invention, the first metal complex and the second metal complex are not chiral isomers of each other.

[0215] According to one embodiment of the present invention, any two metal complexes among the first metal complex, the second metal complex and the third metal complex are not chiral isomers of each other.

[0216] In this document, racemates, enantiomers, and diastereomers are referred to as chiral isomers.

[0217] According to one embodiment of the present invention, the first metal complex and the second metal complex are luminescent materials.

[0218] According to one embodiment of the present invention, the first metal complex, the second metal complex and the third metal complex are luminescent materials.

[0219] According to one embodiment of the present invention, the first metal complex and the second metal complex are phosphorescent materials.

[0220] According to one embodiment of the present invention, the first metal complex, the second metal complex and the third metal complex are phosphorescent materials.

[0221] According to one embodiment of the present invention, the first metal complex and the second metal complex are in the same light-emitting layer, or the first metal complex and the second metal complex are in different light-emitting layers.

[0222] According to one embodiment of the present invention, the first metal complex, the second metal complex and the third metal complex are in the same light-emitting layer, or the first metal complex, the second metal complex and the third metal complex are in different light-emitting layers.

[0223] According to one embodiment of the present invention, the light-emitting layer further includes at least one host material.

[0224] According to one embodiment of the present invention, the at least one main material contains at least one chemical group selected from the group consisting of: benzene, pyridine, pyrimidine, triazine, carbazole, azacarbazole, indolecarbazole, dibenzothiophene, azadibenzothiophene, dibenzofuran, azadibenzofuran, dibenzoselenophene, triphenylene, azatriphenylene, fluorene, silylfluorene, naphthalene, quinoline, isoquinoline, quinazoline, quinoxaline, phenanthrene, azaphenanthrene, and combinations thereof.

[0225] According to one embodiment of the present invention, the at least one host material may be a conventional host material in the prior art, for example, it may typically but not limitatively include the following host materials:

[0226]

[0227]

[0228]

[0229]

[0230] According to one embodiment of the present invention, the evaporation temperature of the first metal complex and the second metal complex is between 200°C and 400°C.

[0231] According to one embodiment of the present invention, the evaporation temperature of the first metal complex and the second metal complex is between 200°C and 300°C.

[0232] According to one embodiment of the present invention, the evaporation temperature of the first metal complex and the second metal complex is between 230°C and 300°C.

[0233] According to one embodiment of the present invention, the evaporation temperature of the first metal complex, the second metal complex and the third metal complex is between 200°C and 400°C.

[0234] According to one embodiment of the present invention, the evaporation temperature of the first metal complex, the second metal complex and the third metal complex is between 200°C and 300°C.

[0235] According to one embodiment of the present invention, the evaporation temperature of the first metal complex, the second metal complex and the third metal complex is between 230°C and 300°C.

[0236] According to one embodiment of the present invention, the difference in evaporation temperature between the first metal complex and the second metal complex under the same conditions is less than 30°C.

[0237] According to one embodiment of the present invention, the difference in evaporation temperature between the first metal complex and the second metal complex under the same conditions is less than 20°C.

[0238] According to one embodiment of the present invention, the difference in evaporation temperature between the first metal complex and the second metal complex under the same conditions is less than 10°C.

[0239] According to one embodiment of the present invention, the difference in evaporation temperature between any two metal complexes among the first metal complex, the second metal complex and the third metal complex under the same conditions is less than 30°C.

[0240] According to one embodiment of the present invention, the difference in evaporation temperature between any two metal complexes among the first metal complex, the second metal complex and the third metal complex under the same conditions is less than 20°C.

[0241] According to one embodiment of the present invention, the difference in evaporation temperature between any two metal complexes among the first metal complex, the second metal complex and the third metal complex under the same conditions is less than 10°C.

[0242] According to an embodiment of the present invention, the first metal complex and the second metal complex are placed in different crucibles for evaporation.

[0243] According to an embodiment of the present invention, the first metal complex and the second metal complex can be pre-mixed and then placed in the same crucible for evaporation.

[0244] According to one embodiment of the present invention, the first metal complex, the second metal complex and the third metal complex are respectively placed in different crucibles for evaporation.

[0245] According to one embodiment of the present invention, the first metal complex, the second metal complex and the third metal complex can be pre-mixed and then placed in the same crucible for evaporation.

[0246] In some embodiments, the difference in evaporation temperature between the first metal complex and the second metal complex (or any two metal complexes among the first metal complex, the second metal complex and the third metal complex) is less than 30° C., preferably less than 20° C., and more preferably less than 10° C. The first metal complex and the second metal complex (or any two metal complexes among the first metal complex, the second metal complex and the third metal complex) meeting the requirement of relatively close evaporation temperatures can be pre-mixed and placed in the same evaporation crucible (evaporation source), and then simultaneously evaporated on the substrate, thereby reducing the number of evaporation sources, simplifying the evaporation process, and saving costs.

[0247] According to one embodiment of the present invention, a mixture is disclosed, wherein the mixture comprises the first metal complex and the second metal complex, and the specific structures of the first metal complex and the second metal complex are as shown in any of the above embodiments.

[0248] According to one embodiment of the present invention, a mixture is disclosed, the mixture comprises the first metal complex, the second metal complex and the third metal complex, and the specific structures of the first metal complex, the second metal complex and the third metal complex are as shown in any of the above embodiments.

[0249] According to one embodiment of the present invention, an electronic device is also disclosed, which includes the organic electroluminescent device described in any of the above embodiments.

[0250] Combination with other materials

[0251] The materials for specific layers in the organic light-emitting device described in the present invention can be used in combination with various other materials present in the device. The combination of these materials is described in detail in paragraphs 0132-0161 of U.S. Patent Application US2016 / 0359122A1, the entire contents of which are incorporated herein by reference. The materials described or mentioned therein are non-limiting examples of materials that can be used in combination with the compounds disclosed herein, and those skilled in the art can easily consult the literature to identify other materials that can be used in combination.

[0252] The materials described herein as specific layers that can be used in organic light-emitting devices can be used in combination with a variety of other materials present in the device. For example, the compounds disclosed herein can be used in combination with a variety of luminescent dopants, hosts, transport layers, barrier layers, injection layers, electrodes, and other layers that may be present. The combination of these materials is described in detail in paragraphs 0080-0101 of U.S. Patent Application US2015 / 0349273A1, the entire contents of which are incorporated herein by reference. The materials described or mentioned therein are non-limiting examples of materials that can be used in combination with the compounds disclosed herein, and those skilled in the art can easily consult the literature to identify other materials that can be used in combination.

[0253] The preparation method of the electroluminescent device is not limited. The preparation method of the following embodiment is only an example and should not be construed as limiting. Those skilled in the art can reasonably improve the preparation method of the following embodiment based on the prior art. For example, the ratio of various materials in the light-emitting layer is not particularly limited. Those skilled in the art can reasonably choose within a certain range based on the prior art. For example, based on the total weight of the light-emitting layer material, the main material can account for 80%-99%, and the light-emitting material can account for 1%-20%; or the main material can account for 90%-99%, and the light-emitting material can account for 1%-10%; or the main material can account for 95%-99%, and the light-emitting material can account for 1%-5%.

[0254] Photoluminescence spectrum:

[0255] The photoluminescence spectra (PL) data of some metal complexes in the present invention were measured using a fluorescence spectrophotometer of model No. 98 produced by Shanghai No. 9 Technology Co., Ltd. The samples of the metal complexes to be tested were prepared with HPLC-grade toluene solutions to a concentration of 1×10 -6 mol / L solution, and then excited with 500 nm wavelength light at room temperature (298 K) and measured its emission spectrum, recording the emission wavelength λ of the photoluminescence spectrum. max (nm) and are shown in Table 1.

[0256] Table 1 Photoluminescence spectrum data and relative molecular mass data of some metal complexes of the present invention

[0257]

[0258]

[0259] It can be seen from the data in Table 1 that the luminescent wavelengths of Compound 133, Compound 139, Compound 213, Compound 7, Compound 14, Compound 55 and Compound 62 disclosed in the present invention are all greater than or equal to 590 nm, and in the three groups of materials of Compound 133, Compound 139 and Compound 213; Compound 7 and Compound 14; and Compound 55 and Compound 62, the difference in the maximum emission wavelengths of any two compounds in each group of materials is greater than 0 nm and less than or equal to 20 nm, and the difference in the relative molecular masses of any two compounds in each group of materials is less than or equal to 50.

[0260] Device Embodiment

[0261] Device Example 1

[0262] First, the glass substrate with a 120nm thick indium tin oxide (ITO) anode was cleaned and then treated with oxygen plasma and UV ozone. After treatment, the substrate was dried in a glove box to remove moisture. The substrate was then mounted on a substrate holder and loaded into a vacuum chamber. The organic layers specified below were placed in a vacuum of approximately 10 -8 The compound HT and the compound HI as a dopant were co-deposited as a hole injection layer (HIL, weight ratio 97:3, ),thickness Compound HT was used as a hole transport layer (HTL) with a thickness of Compound EB is used as an electron blocking layer (EBL) with a thickness of Then, a premixed mixture of compound 133 (first metal complex) and compound 139 (second metal complex) as light-emitting dopants and compound RH as a host material were co-evaporated to form an emission layer (EML, weight ratio 2.5:0.5:97) with a thickness of Compound HB is used as a hole blocking layer (HBL) with a thickness of On the HBL, compound ET and 8-hydroxyquinoline-lithium (Liq) were co-deposited as electron transport layer (ETL, weight ratio 40:60) with a thickness of Finally, 1 nm thick Liq was deposited as an electron injection layer and 120 nm Al was deposited as a cathode. The device was then transferred back to the glove box and encapsulated with a glass cover and a moisture absorber to complete the device.

[0263] Device Example 2

[0264] Device Example 2 was prepared in the same manner as Device Example 1, except that the weight ratio of Compound 133, Compound 139, and Compound RH used in the light emitting layer (EML) was adjusted to 2.25:0.75:97.

[0265] Device Example 3

[0266] Device Example 3 was prepared in the same manner as Device Example 1, except that a mixture of Compound 7 and Compound 14 was used instead of a mixture of Compound 133 and Compound 139 as a light-emitting dopant in the light-emitting layer (EML), and the weight ratio of Compound 7, Compound 14 and Compound RH was adjusted to 2.14:0.86:97.

[0267] Device Example 4

[0268] Device Example 4 was prepared in the same manner as Device Example 1, except that a mixture of Compound 55 and Compound 62 was used instead of a mixture of Compound 133 and Compound 139 as a light-emitting dopant in the light-emitting layer (EML), and the weight ratio of Compound 55, Compound 62 and Compound RH was adjusted to 2.14:0.86:97.

[0269] Device Example 5

[0270] Device Example 5 was prepared in the same manner as Device Example 1, except that a mixture of Compound 133, Compound 213 and Compound 139 was used instead of a mixture of Compound 133 and Compound 139 as a light-emitting dopant in the light-emitting layer (EML), and the weight ratio of Compound 133, Compound 213, Compound 139 and Compound RH was adjusted to 1.64:1.13:0.23:97.

[0271] Device Example 6

[0272] Device Example 6 was prepared in the same manner as Device Example 5, except that the weight ratio of Compound 133, Compound 139, and Compound RH used in the light emitting layer (EML) was adjusted to 1.57:1.21:0.22:97.

[0273] Device Example 7

[0274] Device Example 7 was prepared in the same manner as Device Example 5, except that the weight ratio of Compound 133, Compound 139, and Compound RH used in the emission layer (EML) was adjusted to 2.18:0.73:0.09:97.

[0275] Device Comparison Example 1

[0276] Device Comparative Example 1 was prepared in the same manner as Device Example 1, except that Compound 133 was used as the light-emitting dopant in the emission layer (EML) instead of the mixture of Compound 133 and Compound 139, and the weight ratio of Compound 133 to Compound RH was 3:97.

[0277] Device Comparison Example 2

[0278] Device Comparative Example 2 was prepared in the same manner as Device Example 1, except that Compound 139 was used instead of the mixture of Compound 133 and Compound 139 as the light-emitting dopant in the emission layer (EML), and the weight ratio of Compound 139 to Compound RH was 3:97.

[0279] Device Comparison Example 3

[0280] Device Comparative Example 3 was prepared in the same manner as Device Example 1, except that Compound 7 was used as the light-emitting dopant instead of the mixture of Compound 133 and Compound 139 in the light-emitting layer (EML), and the weight ratio of Compound 7 to Compound RH was 3:97.

[0281] Device Comparison Example 4

[0282] Device Comparative Example 4 was prepared in the same manner as Device Example 1, except that Compound 14 was used as the light-emitting dopant in the light-emitting layer (EML) instead of the mixture of Compound 133 and Compound 139, and the weight ratio of Compound 14 to Compound RH was 3:97.

[0283] Device Comparison Example 5

[0284] Device Comparative Example 5 was prepared in the same manner as Device Example 1, except that Compound 55 was used as the light-emitting dopant instead of the mixture of Compound 133 and Compound 139 in the light-emitting layer (EML), and the weight ratio of Compound 55 to Compound RH was 3:97.

[0285] Device Comparison Example 6

[0286] Device Comparative Example 6 was prepared in the same manner as Device Example 1, except that Compound 62 was used as the light-emitting dopant instead of the mixture of Compound 133 and Compound 139 in the light-emitting layer (EML), and the weight ratio of Compound 62 to Compound RH was 3:97.

[0287] The detailed device layer structure and thickness are shown in the table below. For layers using more than one material, different compounds are doped in the weight ratios recorded.

[0288] Table 2 Partial device structures of device embodiments and comparative examples

[0289]

[0290]

[0291] The material structure used in the device is shown below:

[0292]

[0293]

[0294] Table 3 shows that at 15 mA / cm 2 CIE data, driving voltage (V), maximum emission wavelength (λ) of device embodiments 1-7 and device comparative examples 1-6 measured under constant current max ) and external quantum efficiency (EQE).

[0295] Table 3 Device data of Examples 1-7 and Comparative Examples 1-6

[0296]

[0297]

[0298] discuss:

[0299] From the data in Table 3, it can be seen that Comparative Examples 1 and 2 use Compound 133 and Compound 139 as luminescent dopants, respectively, and Example 1 and Example 2 use Compound 133 and Compound 139 as luminescent dopants at the same time. By comparing the CIE values ​​and λ between Example 1 and Comparative Examples 1 and 2, and between Example 2 and Comparative Examples 1 and 2, max It can be found that mixing the two metal complexes as luminescent dopants can change the luminescent wavelength of the device, thereby finely controlling the luminescent color of the device; and both Example 1 and Example 2 use Compound 133 and Compound 139 as luminescent dopants at the same time, and the doping ratios of Compound 133 and Compound 139 are different. By comparing the CIE values ​​and λ of Example 1 and Example 2 max It can be found that by adjusting the doping ratio of the two metal complexes, it is also very convenient to achieve fine adjustment of the wavelength or color of the device. At the same time, compared with Comparative Example 1 and Comparative Example 2, the voltage of Example 1 and Example 2 is further reduced, and the efficiency is maintained at a high efficiency level comparable to it.

[0300] Comparative Examples 3 and 4 respectively use Compound 7 and Compound 14 as luminescent dopants, while Example 3 uses Compound 7 and Compound 14 as luminescent dopants at the same time. By comparing the CIE values ​​and λ values ​​of Example 3, Comparative Examples 3 and 4, max It can be found that mixing two metal complexes as luminescent dopants can change the luminescent wavelength of the device, thereby finely controlling the luminescent color of the device. At the same time, compared with Comparative Example 3 and Comparative Example 4, the voltage of Example 3 is maintained at a low voltage level comparable to them, and the efficiency is slightly improved.

[0301] Comparative Examples 5 and 6 respectively use Compound 55 and Compound 62 as luminescent dopants, while Example 4 uses Compound 55 and Compound 62 as luminescent dopants at the same time. By comparing the CIE values ​​and λ values ​​of Example 4, Comparative Examples 5 and 6, max It can be found that in the deep red luminescent region, mixing the two metal complexes as luminescent dopants can also change the luminescent wavelength of the device, thereby finely adjusting the luminescent color of the device. At the same time, compared with Comparative Examples 5 and 6, the voltage of Example 4 is maintained at a low voltage level comparable to them, and the efficiency is slightly improved.

[0302] In Examples 5 to 7, three metal complexes are used as luminescent dopants in the luminescent layer at the same time. Compared with Comparative Examples 1 and 2 in which one metal complex is used as the luminescent dopant, the three metal complexes are mixed as luminescent dopants, which can also effectively change the luminescent wavelength of the device, thereby finely adjusting the luminescent color of the device; and comparing the CIE values ​​and λ of Example 5, Example 6 and Example 7, max It can also be found that by adjusting the ratio of the three metal complexes, the color of the device can be finely adjusted. At the same time, compared with Comparative Example 1 and Comparative Example 2, the voltage of Examples 5 to 7 is further reduced, and the high efficiency level is comparable to it, and the excellent device performance is still maintained.

[0303] In summary, the organic electroluminescent device disclosed in the present invention uses at least two specific metal complexes as luminescent dopants in the luminescent layer, and by adjusting the doping ratio of the metal complexes used, the luminescent wavelength of the device can be effectively changed, thereby being able to finely control the luminescent color of the device while maintaining a low device voltage and high luminescent efficiency, and has a very broad application prospect.

[0304] It should be understood that the various embodiments described herein are only examples and are not intended to limit the scope of the present invention. Therefore, as will be apparent to those skilled in the art, the claimed invention may include variations of the specific embodiments and preferred embodiments described herein. Many of the materials and structures described herein may be replaced with other materials and structures without departing from the spirit of the present invention. It should be understood that the various theories about why the present invention works are not intended to be restrictive.

Claims

1. An organic electroluminescent device, comprising: anode, cathode, and a light-emitting layer disposed between the anode and the cathode, the light-emitting layer comprising at least a first metal complex and a second metal complex, wherein the first metal complex and the second metal complex are different, the maximum emission wavelengths of the photoluminescence spectra of the first metal complex and the second metal complex are both greater than or equal to 590 nm; and the first metal complex and the second metal complex at least meet any one or two of the following conditions: (1) The difference in the maximum emission wavelengths of the photoluminescence spectra of the first metal complex and the second metal complex is greater than 0 nm and less than or equal to 20 nm; (2) The difference in relative molecular weight between the first metal complex and the second metal complex is less than or equal to 50.

2. The organic electroluminescent device according to claim 1, wherein: The maximum emission wavelength of the photoluminescence spectrum of the first metal complex and the second metal complex is between 590 nm and 640 nm; Preferably, the maximum emission wavelength of the photoluminescence spectra of the first metal complex and the second metal complex is between 610 nm and 640 nm.

3. The organic electroluminescent device according to claim 1, wherein: The difference between the maximum emission wavelengths of the photoluminescence spectra of the first metal complex and the second metal complex is greater than 0 nm and less than or equal to 10 nm; Preferably, the difference in maximum emission wavelengths of the photoluminescence spectra of the first metal complex and the second metal complex is greater than or equal to 3 nm and less than or equal to 7 nm.

4. The organic electroluminescent device according to claim 1, wherein: The difference between the relative molecular weights of the first metal complex and the second metal complex is less than or equal to 40; Preferably, the difference in relative molecular mass between the first metal complex and the second metal complex is less than or equal to 30.

5. The organic electroluminescent device according to claim 1, wherein: The light-emitting layer at least comprises a first metal complex, a second metal complex and a third metal complex, the first metal complex, the second metal complex and the third metal complex are different from each other, and the maximum emission wavelength of the photoluminescence spectrum of the first metal complex, the second metal complex and the third metal complex is greater than or equal to 590nm; and the first metal complex, the second metal complex and the third metal complex at least meet any one or two of the following conditions: (1) The difference in the maximum emission wavelengths of the photoluminescence spectra of any two of the first metal complex, the second metal complex and the third metal complex is greater than 0 nm and less than or equal to 20 nm; (2) The difference in relative molecular weights between any two of the first metal complex, the second metal complex and the third metal complex is less than or equal to 50.

6. The organic electroluminescent device according to claim 1, wherein: The first metal complex and the second metal complex each independently comprise a metal M and a ligand L coordinated with M. a , the metal is selected from metals with a relative atomic mass greater than 40, the ligand L a Contains at least one fused ring structure; Preferably, the at least one fused ring structure comprises an aza six-membered ring connected to the metal M via a nitrogen atom; More preferably, the ligand L a Having a structure represented by Formula 1 or Formula 2: Wherein, in Formula 1, Ring A and Ring B are each independently selected from a five-membered unsaturated carbocyclic ring, an aromatic ring having 6 to 30 carbon atoms, or a heteroaromatic ring having 3 to 30 carbon atoms; R i Each occurrence of R is the same or different, indicating mono-, poly- or unsubstituted; ii Each occurrence is identical or different and indicates mono-, poly-, or unsubstituted; Y is selected from SiR y R y ,GeR y R y , NR y , P.R. y , O, S or Se; when there are two R y When two R y Same or different; X1-X2 are selected from CR in the same or different ways each time they appear x or N; In Formula 2, X3-X6 are selected from CR i or N; Each occurrence of A1-A6 is selected from CR ii or N; V1 and V2 are each independently selected from C or N, and V1 and V2 are different; R, R i , R ii , R x and R y 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 amine 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 i , R ii , R x and R y Can optionally be linked to form a ring.

7. The organic electroluminescent device according to claim 6, wherein: Ring A and / or Ring B are each independently selected from a five-membered unsaturated carbocyclic ring, an aromatic ring having 6 to 18 carbon atoms, or a heteroaromatic ring having 3 to 18 carbon atoms; Preferably, Ring A and / or Ring B are each independently selected from a five-membered unsaturated carbocyclic ring, an aromatic ring having 6 to 10 carbon atoms or a heteroaromatic ring having 3 to 10 carbon atoms.

8. The organic electroluminescent device according to claim 6, wherein the ligand L a A structure selected from any one of Formula 1-1 to Formula 1-13, Formula 2-1 to Formula 2-2: in, X1-X2 are selected from CR in the same or different ways each time they appear x or N; X3-X7 are selected from CR in the same or different manner each time they appear i or N; A1-A6 are selected from CR in the same or different manner each time they appear ii or N; Each time Z appears, it is selected from CR iii R iii ,SiR iii R iii , P.R. iii , O, S or NR iii ; When there are two R iii When two R iii Same or different; Y is selected from SiR y R y , NR y , P.R. y , O, S or Se; when there are two R y When two R y Same or different; R, R x , R y , R i , R ii and R iii 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 amine 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 x , R y , R i , R ii and R iii can optionally be linked to form a ring; Preferably, the ligand L a A structure selected from the group consisting of Formula 1-1 and Formula 1-7; More preferably, the ligand L a Select the structure represented by Formula 1-7.

9. The organic electroluminescent device according to claim 8, wherein: X1-X n and / or A1-A m At least one of the X is selected from N, n Corresponding to the X1-X7 with the largest sequence number in any of Formulas 1-1 to 1-13, 2-1 to 2-2, the A m The corresponding A1-A6 has the largest sequence number in any one of Formulas 1-1 to 1-13, 2-1 to 2-2; Preferably, X1-X n At least one of the X is selected from N, n The corresponding X1-X7 has the largest sequence number in any one of Formulas 1-1 to 1-13, 2-1 to 2-2; More preferably, X2 is N.

10. The organic electroluminescent device according to claim 8, wherein: In Formula 1-1 to Formula 1-13, Formula 2-1 to Formula 2-2, X1-X2 are each independently selected from CR x ; X3-X7 are each independently selected from CR i ; A1-A6 are each independently selected from CR ii ; Adjacent substituent R x , R i , R ii can optionally be linked to form a ring; Preferably, the R x , R i , R ii each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, cyano, and combinations thereof; More preferably, the R x , R i , R ii At least two or three of the following are selected, at each occurrence, identically or differently, from the group consisting of deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, cyano, and combinations thereof.

11. The organic electroluminescent device according to claim 8, wherein: In Formulae 1-1 to 1-6 and Formulae 2-1 to 2-2, X4 is selected from CR i In Formula 1-7 to Formula 1-11, X7 is selected from CR i ; And the R i is selected, at each occurrence, identically or differently, from hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, cyano, or a combination thereof; Preferably, the R i Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, fluorine, methyl, ethyl, isopropyl, isobutyl, tert-butyl, neopentyl, cyclopentyl, cyclopentylmethyl, cyclohexyl, norbornyl, adamantyl, trimethylsilyl, isopropyldimethylsilyl, phenyldimethylsilyl, trifluoromethyl, cyano, phenyl, and combinations thereof.

12. The organic electroluminescent device according to claim 8, wherein: In Formulae 1-1 to 1-13, R is selected from hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, or a combination thereof; Preferably, R is selected from hydrogen, deuterium, fluorine, methyl, ethyl, isopropyl, isobutyl, tert-butyl, cyclopentyl, cyclopentylmethyl, cyclohexyl, neopentyl, deuterated methyl, deuterated ethyl, deuterated isopropyl, deuterated isobutyl, deuterated tert-butyl, deuterated cyclopentyl, deuterated cyclopentylmethyl, deuterated cyclohexyl, deuterated neopentyl, trimethylsilyl, or a combination thereof.

13. The organic electroluminescent device according to claim 8, wherein: Y is selected from O or S; preferably, Y is O.

14. The organic electroluminescent device according to claim 6, wherein: The ligand L a Each time it appears, choose the same or different one from L a1 To L a634 Groups composed of:

15. The organic electroluminescent device according to claim 14, wherein: The first metal complex and the second metal complex have M(L a ) m (L b ) n (L c ) q structure; Wherein, the metal M is selected from metals with a relative atomic mass greater than 40; L a , L b and L c are the first ligand, the second ligand and the third ligand of the complex respectively; m is 1, 2 or 3, n is 0, 1 or 2, q is 0, 1 or 2, m+n+q is equal to the oxidation state of the metal M; when m is greater than 1, multiple L a The same or different; when n is 2, the two L b The same or different; when q is 2, the two L c Same or different; L a , L b and L c can optionally be linked to form a multidentate ligand; L b and L c Each occurrence is identically or differently selected from the group consisting of: Among them, R a , R b and R c Each occurrence is identical or different and indicates mono-, poly-, or unsubstituted; X b Each occurrence is identically or differently selected from the group consisting of: O, S, Se, NR N1 and CR C1 R C2 ; X c and X d Each occurrence is identically or differently selected from the group consisting of: O, S, Se and NR N2 ; R a , R b , R c , R N1 , R N2 , R C1 and R C2 The alkyl radicals are selected, at each occurrence, identically or differently, from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl radicals having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl radicals having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl radicals having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl radicals having 3 to 20 ring atoms, substituted or unsubstituted aralkyl radicals having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy radicals having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy radicals having 6 to 30 carbon atoms, substituted or unsubstituted alkene radicals having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted alkylgermanyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylgermanyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof; Among them, the adjacent substituent R a , R b , R c , R N1 , R N2 , R C1 and R C2 Can optionally be linked to form a ring.

16. The organic electroluminescent device according to claim 15, wherein: The metal M is selected from Ir, Rh, Re, Os, Pt, Au or Cu; preferably, the metal M is selected from Ir, Pt or Os; more preferably, the metal M is Ir.

17. The organic electroluminescent device according to claim 15, wherein: L b Each occurrence is identically or differently selected from the following structures: wherein R1-R7 are selected, at each occurrence, identically or differently, from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 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 2-20 carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanyl groups having 3-20 carbon atoms, substituted or unsubstituted arylgermanyl groups having 6-20 carbon atoms, substituted or unsubstituted amino groups having 0-20 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 R1, R2, R3, R4, R5, R6, R7 can be optionally linked to form a ring; Preferably, at least one or two of R1-R3 are selected from substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, or combinations thereof, at each occurrence; and / or at least one or two of R4-R6 are selected from substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, or combinations thereof, at each occurrence; More preferably, at least two of R1-R3 are selected from substituted or unsubstituted alkyl groups having 2-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 2-20 carbon atoms, or combinations thereof at each occurrence, either identically or differently; and / or at least two of R4-R6 are selected from substituted or unsubstituted alkyl groups having 2-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 2-20 carbon atoms at each occurrence, either identically or differently.

18. The organic electroluminescent device according to claim 17, wherein: L b Each occurrence is identically or differently selected from the group consisting of: Among them, L c Each occurrence is identically or differently selected from the group consisting of:

19. The organic electroluminescent device according to claim 18, wherein: The first metal complex and the second metal complex each independently have Ir(L a )2(L b ) or Ir(L a )2(L c ) or Ir(L a )(L c )2 or Ir(L a )(L b )(L c ) structure; Wherein, when the first metal complex and the second metal complex have Ir(L a )2(L b ) structure, L a Each time it appears, choose the same or different one from L a1 To L a634 Any one or two of the group consisting of L b Choose from L b1 To L b322 When the first metal complex and the second metal complex have Ir(L a )2(L c ) structure, L a Each time it appears, choose the same or different one from L a1 To L a634 Any one or two of the group consisting of L c Choose from L c1 To L c231 When the first metal complex and the second metal complex have Ir(L a )(L c )2 structure, L a Choose from L a1 To L a634 Any of the groups consisting of L c Each time it appears, choose the same or different one from L c1 To L c231 When the first metal complex and the second metal complex have Ir(L a )(L b )(L c ) structure, the L a Choose from L a1 To L a634 Any one of the group consisting of b Choose from L b1 To L b322 Any one of the group consisting of c Choose from L c1 To L c231 Any of the groups consisting of; Preferably, the first metal complex and the second metal complex are each independently selected from the group consisting of Compound 1 to Compound 280; Optionally, hydrogen in the structures of Compound 1 to Compound 280 can be partially or completely replaced by deuterium.

20. The organic electroluminescent device according to claim 1, wherein: The light-emitting layer also includes at least one host material. Preferably, the at least one host material comprises at least one chemical group selected from the group consisting of benzene, pyridine, pyrimidine, triazine, carbazole, azacarbazole, indolecarbazole, dibenzothiophene, azadibenzothiophene, dibenzofuran, azadibenzofuran, dibenzoselenophene, triphenylene, azatriphenylene, fluorene, silylfluorene, naphthalene, quinoline, isoquinoline, quinazoline, quinoxaline, phenanthrene, azaphenanthrene, and combinations thereof.

21. The organic electroluminescent device according to claim 1, wherein: The first metal complex and the second metal complex are pre-mixed and placed in the same crucible for evaporation.

22. An electronic device comprising the organic electroluminescent device according to any one of claims 1 to 21.

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