Organic light-emitting device and display device thereof

Abstract

Disclosed are an organic electroluminescent device and a display device. An organic layer of the organic electroluminescent device simultaneously contains a metal complex (containing a La ligand with a structure of a formula 1) with a specific structure, a fluorescent light-emitting material represented by a structure of a formula 1-1, and a specific micromolecular first host compound with triplet energy higher than that of the metal complex. According to the novel organic light-emitting device, on the basis that low driving voltage and narrow half-peak width are maintained, the power efficiency and / or the service life of the device can be further remarkably improved, and the novel organic light-emitting device has excellent comprehensive performance. The invention further discloses a display device comprising the organic light-emitting device.

Description

Technical Field

[0001] The present invention relates to organic electronic devices, such as organic light emitting diodes. More particularly, it relates to an organic light emitting diode device comprising a first host compound, a metal complex and a fluorescent emitting material in an organic layer, and a display device comprising the organic light emitting diode device. Background Art

[0002] Organic electronic devices include, but are not limited to, the following types: 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 quantum dots (OFQDs), light emitting electrochemical cells (LECs), organic laser diodes, and organic electroluminescent devices.

[0003] In 1987, Tang and Van Slyke of Eastman Kodak reported a bilayer organic light emitting diode device comprising an arylamine hole transport layer and a tris-8-hydroxyquinoline-aluminum layer as an electron transport layer and a light emitting layer (Applied Physics Letters, 1987, 51(12): 913-915). 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 a cathode and an anode. Since OLEDs are a self-emitting solid-state device, 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 in the fabrication of flexible substrates.

[0004] OLEDs can be classified into three different types according to their light-emitting mechanisms. The OLED invented by Tang and van Slyke is a fluorescent OLED. It only uses singlet emission. The triplets (or triplet states) generated in the device are 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 use triplet emission from heavy metals in complexes as emitters. Therefore, it is possible to harvest both singlet and triplet states, achieving 100% IQE. Due to its high efficiency, the discovery and development of phosphorescent OLEDs have 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 the triplet state to the singlet state. In TADF devices, triplet excitons can generate singlet excitons through reverse intersystem crossing, resulting in high IQE.

[0005] OLEDs can also be classified as small-molecule and polymer OLEDs according to the form of the materials used. Small molecules refer to any organic or organometallic materials that are not polymers. As long as they have an exact structure, the molecular weight of small molecules can be very large. Dendrimers with a well-defined structure are considered small molecules. Polymer OLEDs include conjugated polymers and non-conjugated polymers with side-group light-emitting groups. If post-polymerization occurs during the manufacturing process, small-molecule OLEDs can become polymer OLEDs.

[0006] There are various methods for manufacturing OLEDs. 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. If the materials can be dissolved or dispersed in a solvent, small-molecule OLEDs can also be manufactured by solution methods.

[0007] The emission color of OLEDs can be achieved through the structural design of the light-emitting materials. OLEDs can include one or more light-emitting layers to achieve the desired spectrum. For green, yellow, and red OLEDs, phosphorescent materials have been successfully commercialized. Blue phosphorescent devices still have problems such as blue unsaturation, short device lifetime, and high operating voltage. Commercial full-color OLED displays usually adopt a hybrid strategy, using blue fluorescence and phosphorescent yellow, or red and green. Currently, the rapid reduction in the efficiency of phosphorescent OLEDs at high brightness is still a problem. In addition, more saturated emission spectra, higher efficiency, and longer device lifetimes are desired.

[0008] Angew.Chem.Int.Ed.2023,62,e202304104 discloses a structural formula of The fluorescent compound and the device containing the compound utilize Ir(ppy)3 as a phosphorescent photosensitizer and are combined with different host materials to achieve good device performance of phosphorescent photosensitized fluorescence. However, this article only discloses the specific application of Ir(ppy)3 as a phosphorescent photosensitizer, and does not teach the device of a metal complex with other structures as a phosphorescent photosensitizer combined with a fluorescent material with a specific structure and the special effects thereof.

[0009] In addition to new luminescent materials, the combination of different materials, especially the combination of different phosphorescent photosensitizers, fluorescent materials, and / or host materials, is also particularly important for device performance. To meet the increasing demands in the industry, especially for higher device efficiency, longer lifespan, and other performance requirements, further research and development on the combination of different phosphorescent photosensitizers and fluorescent materials are still needed. Summary of the Invention

[0010] The present invention aims to provide a novel organic electroluminescent device to solve at least part of the above problems. The organic layer of the organic electroluminescent device simultaneously contains a metal complex with a specific structure (including the L a ligand having the structure of Formula 1), a fluorescent material represented by the structure of Formula 1-1, and a specific small molecule first host compound with a triplet energy level higher than that of the metal complex. The novel organic electroluminescent device of the present invention can further significantly improve the device efficiency and / or lifespan while maintaining a low driving voltage and a narrow full width at half maximum, and has excellent comprehensive performance.

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

[0012] An anode,

[0013] A cathode,

[0014] And an organic layer disposed between the anode and the cathode, wherein the organic layer at least includes a first host compound, a metal complex, and a fluorescent material;

[0015] The triplet energy level of the first host compound is higher than the triplet energy level of the metal complex;

[0016] The first host compound is a small molecule compound;

[0017] Wherein, the metal complex includes a metal M and a ligand L a coordinated with the metal M. The metal M is selected from metals with a relative atomic mass greater than 40, and the L a has a structure represented by Formula 1:

[0018]

[0019] Among them,

[0020] ring A1 and ring A2 are each independently selected from an aromatic ring having 6 - 30 ring atoms, a heteroaromatic ring having 5 - 30 ring atoms, or a combination thereof;

[0021] E1 and E2 are each independently the same or different and are selected from C or N;

[0022] G1 and G2 are each independently the same or different and are selected from a single bond, O, S, or NR';

[0023] L1 is each independently the same or different and is selected from the group consisting of: a single bond, BR", CR"R", NR", O, SiR"R", PR", S, GeR"R", Se, a substituted or unsubstituted vinylene, an ethynylene, a substituted or unsubstituted arylene having 6 - 30 carbon atoms, a substituted or unsubstituted heteroarylene having 3 - 30 carbon atoms, and combinations thereof; when two R" are present simultaneously, the two R" are the same or different;

[0024] R1 and R2 are each independently the same or different and represent mono - substituted, multi - substituted, or unsubstituted;

[0025] R1, R2, R', and R" are each independently the same or different and are selected from the group consisting of: hydrogen, deuterium, halogen, a substituted or unsubstituted alkyl having 1 - 20 carbon atoms, a substituted or unsubstituted cycloalkyl having 3 - 20 ring carbon atoms, a substituted or unsubstituted heteroalkyl having 1 - 20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3 - 20 ring atoms, a substituted or unsubstituted aralkyl having 7 - 30 carbon atoms, a substituted or unsubstituted alkoxy having 1 - 20 carbon atoms, a substituted or unsubstituted aryloxy having 6 - 30 carbon atoms, a substituted or unsubstituted alkenyl having 2 - 20 carbon atoms, a substituted or unsubstituted alkynyl having 2 - 20 carbon atoms, a substituted or unsubstituted aryl having 6 - 30 carbon atoms, a substituted or unsubstituted heteroaryl having 3 - 30 carbon atoms, a substituted or unsubstituted alkylsilyl having 3 - 20 carbon atoms, a substituted or unsubstituted arylsilyl having 6 - 20 carbon atoms, a substituted or unsubstituted alkylgermyl having 3 - 20 carbon atoms, a substituted or unsubstituted arylgermyl having 6 - 20 carbon atoms, a substituted or unsubstituted amino having 0 - 20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0026] When metal M is selected from Ir, L1 is selected from a single bond, G1 and G2 are selected from a single bond, and one of ring A1 and ring A2 is selected from a benzene ring and the other is selected from a pyridine ring, R1 and R2, each occurrence being the same or different, represent mono-substituted or poly-substituted, and at least one of R1 and R2 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 heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclic group having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted alkynyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermyl having 3-20 carbon atoms, substituted or unsubstituted arylgermyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0027] The adjacent substituents R1, R2, R' and R" can optionally be joined to form a ring;

[0028] The fluorescent luminescent material has a structure represented by Formula 1-1:

[0029]

[0030] wherein, ring A, ring B, ring C, ring D, ring E, each occurrence being the same or different, are selected from unsaturated carbocycles having 5-30 carbon atoms, or unsaturated heterocycles having 3-30 carbon atoms;

[0031] X1, X2 are selected from O, S, Se, BR E , NR E , CR E R E , or SiR E R E ; when two Rs E are present simultaneously, the two Rs E are the same or different;

[0032] R ta ’, R tb ’, R tc ’, R td’ and R te ’ represents, each time it appears, the same or differently, mono-substituted, multi-substituted or unsubstituted;

[0033] R ta ’, R tb ’, R tc ’, R td ’, R te ’ and R E represents, each time it appears, the same or differently, selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 - 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 - 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 - 20 carbon atoms, substituted or unsubstituted heterocyclic group having 3 - 20 ring atoms, substituted or unsubstituted aralkyl having 7 - 30 carbon atoms, substituted or unsubstituted alkoxy having 1 - 20 carbon atoms, substituted or unsubstituted aryloxy having 6 - 30 carbon atoms, substituted or unsubstituted alkenyl having 2 - 20 carbon atoms, substituted or unsubstituted aryl having 6 - 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 - 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 - 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 - 20 carbon atoms, substituted or unsubstituted alkylgermyl having 3 - 20 carbon atoms, substituted or unsubstituted arylgermyl having 6 - 20 carbon atoms, substituted or unsubstituted amino having 0 - 20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, -BR t ”R t ”, and combinations thereof;

[0034] R t”Each occurrence is the same as or different from and is selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 - 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 - 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 - 20 carbon atoms, substituted or unsubstituted heterocyclic group having 3 - 20 ring atoms, substituted or unsubstituted aralkyl having 7 - 30 carbon atoms, substituted or unsubstituted alkoxy having 1 - 20 carbon atoms, substituted or unsubstituted aryloxy having 6 - 30 carbon atoms, substituted or unsubstituted alkenyl having 2 - 20 carbon atoms, substituted or unsubstituted aryl having 6 - 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 - 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 - 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 - 20 carbon atoms, substituted or unsubstituted alkylgermyl having 3 - 20 carbon atoms, substituted or unsubstituted arylgermyl having 6 - 20 carbon atoms, substituted or unsubstituted amino having 0 - 20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0035] Adjacent substituents R ta ’, R tb ’, R tc ’, R td ’, R te ’, R t ” and R E can optionally be linked to form a ring.

[0036] According to another embodiment of the present invention, a display device is also disclosed, which includes the organic electroluminescent device as described above.

[0037] According to another embodiment of the present invention, the application of the organic electroluminescent device as described above in a display device is also disclosed. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic diagram of an organic light-emitting device that can include the organic electroluminescent device disclosed herein.

[0039] Figure 2 is another schematic diagram of an organic light-emitting device that can include the organic electroluminescent device disclosed herein. DETAILED DESCRIPTION

[0040] OLEDs can be fabricated on various substrates, such as glass, plastic, and metal. Figure 1Schematically and non - restrictively shows an organic light - emitting device 100. The figures are not necessarily drawn to scale, and some layer structures in the figures may also be omitted as needed. 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. Device 100 can be fabricated by sequentially depositing the described layers. The properties and functions of each layer and exemplary materials are described in more detail in columns 6 - 10 of U.S. Patent US7,279,704B2, the entire content of which is incorporated herein by reference.

[0041] There are more examples for each of these layers. For example, U.S. Patent No. 5,844,363, which is incorporated by reference in its entirety, discloses a flexible and transparent substrate - anode combination. An example of a p - doped hole - transporting layer is m - MTDATA doped with F4 - TCNQ at a molar ratio of 50:1, as disclosed in U.S. Patent Application Publication No. 2003 / 0230980, which is incorporated by reference in its entirety. Examples of host materials are disclosed in U.S. Patent No. 6,303,238, which is incorporated by reference in its entirety and is awarded to Thompson et al. An example of an n - doped electron - transporting 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. Patents No. 5,703,436 and No. 5,707,745, which are incorporated by reference in their entirety, disclose examples of cathodes that include a composite cathode having a thin metal layer such as Mg:Ag and an overlying transparent, conductive, sputter - deposited ITO layer. The principles and uses of blocking layers are described in more detail in U.S. Patent No. 6,097,147 and U.S. Patent Application Publication No. 2003 / 0230980, which are incorporated by reference in their entirety. Examples of injection layers are provided in U.S. Patent Application Publication No. 2004 / 0174116, which is incorporated by reference in its entirety. A description of the protective layer can be found in U.S. Patent Application Publication No. 2004 / 0174116, which is incorporated by reference in its entirety.

[0042] The above - described layered structure is provided by way of non - limiting examples. The functions of the OLED can be achieved by combining the various layers described above, or some layers can be completely omitted. 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 sub - layers. For example, the light - emitting layer can have two different light - emitting materials to achieve a desired emission spectrum.

[0043] In one embodiment, an OLED can be described as having an "organic layer" disposed between a cathode and an anode. The organic layer can include one or more layers.

[0044] OLEDs also require a encapsulation layer, such as Figure 2 schematically and non - restrictively shows an organic light - emitting device 200, which Figure 1 differently, an encapsulation layer 102 can also be included above the cathode 190 to prevent harmful substances from the environment, such as moisture and oxygen. Any material capable of providing an encapsulation function can be used as the encapsulation layer, such as glass or an organic - inorganic hybrid layer. The encapsulation layer should be placed directly or indirectly outside the OLED device. Multilayer thin - film encapsulation is described in U.S. Patent US7,968,146B2, the entire content of which is incorporated herein by reference.

[0045] 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) with 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, head - up displays, fully or partially transparent displays, flexible displays, smart phones, tablet computers, phablets, wearable devices, smart watches, laptop computers, digital cameras, portable video cameras, viewfinders, microdisplays, 3 - D displays, vehicle displays, and taillights.

[0046] The materials and structures described herein can also be used in other organic electronic devices listed above.

[0047] As used herein, "top" means farthest from the substrate, and "bottom" means closest to the substrate. In the case 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 "contacts" the second layer, other layers can exist between the first and second layers. For example, even though there are various organic layers between the cathode and the anode, the cathode can still be described as being "disposed on" the anode.

[0048] As used herein, "solution - processable" means capable of being dissolved, dispersed, or transported in a liquid medium in the form of a solution or suspension and / or deposited from a liquid medium.

[0049] As used herein, "end-emitting material" refers to the material that serves as the final light-emitting source when the organic electroluminescent device (a device whose light-emitting layer contains at least two light-emitting materials) described herein is lit. For example, if the light-emitting layer of the organic electroluminescent device contains a metal complex (phosphorescent light-emitting material) and a fluorescent light-emitting material, and when the device is lit, due to energy transfer, the metal complex does not emit light / almost does not emit light, and the device uses the fluorescent light-emitting material as the main light-emitting source, then the fluorescent light-emitting material at this time is the end-emitting material of the electroluminescent device, including but not limited to Device Examples 1 to 7 of the present invention. Of course, the end-emitting material in the organic electroluminescent device of the present invention can be one material or multiple different materials.

[0050] When it is believed that the ligand directly contributes to the photosensitive properties of the emissive material, the ligand can be called "photosensitive". When it is believed that the ligand does not contribute to the photosensitive properties of the emissive material, the ligand can be called "auxiliary", but the auxiliary ligand can change the properties of the photosensitive ligand.

[0051] It is believed that the internal quantum efficiency (IQE) of fluorescent OLEDs can exceed the 25% spin statistical limit by 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).

[0052] On the other hand, E-type delayed fluorescence does not rely on the collision of two triplets, but on the conversion between the triplet state and the singlet excited state. Compounds capable of generating E-type delayed fluorescence need to have an extremely small singlet-triplet gap for the energy state conversion. Thermal energy can activate the transition from the triplet state back to the singlet state. This type of delayed fluorescence is also called thermally activated delayed fluorescence (TADF). The remarkable 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 of the triplet state, then the fraction of the singlet excited state refilled may reach 75%. The total singlet fraction can be 100%, far exceeding the 25% spin statistics of electro-generated excitons.

[0053] The characteristics of E-type delayed fluorescence can be seen in the exciplex system or a single compound. Without being bound by theory, it is believed that 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 as donor-acceptor charge transfer (CT) type emission. The spatial separation of HOMO and LUMO in these donor-acceptor type compounds usually results in a small ΔE S-TThese states can include CT states. Generally, donor - acceptor luminescent materials are constructed by connecting an electron - donor moiety (such as an amino or carbazole derivative) to an electron - acceptor moiety (such as an N - containing six - membered aromatic ring).

[0054] Definition of substituent terms

[0055] Halogen or halide - as used herein, includes fluorine, chlorine, bromine, and iodine.

[0056] Alkyl - as used herein, includes straight - chain and branched - chain alkyls. The alkyl can be an alkyl having 1 to 20 carbon atoms, preferably an alkyl having 1 to 12 carbon atoms, more preferably an alkyl having 1 to 6 carbon atoms. Examples of alkyls 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. Additionally, the alkyl can be optionally substituted.

[0057] Cycloalkyl - as used herein, includes cyclic alkyls. The cycloalkyl can be a cycloalkyl having 3 to 20 ring carbon atoms, preferably a cycloalkyl having 4 to 10 carbon atoms. Examples of cycloalkyls 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, and 4,4 - dimethylcyclohexyl are preferred. Additionally, the cycloalkyl can be optionally substituted.

[0058] Heteroalkyl - As used herein, heteroalkyl is formed by substituting one or more carbons in an alkyl chain 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 can be a heteroalkyl having 1 to 20 carbon atoms, preferably a heteroalkyl having 1 to 10 carbon atoms, and more preferably a heteroalkyl 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, trimethylgermylmethyl, trimethylgermylethyl, trimethylgermylisopropyl, dimethylethylgermylmethyl, dimethylisopropylgermylmethyl, tert - butyldimethylgermylmethyl, triethylgermylmethyl, triethylgermylethyl, triisopropylgermylmethyl, triisopropylgermylethyl, trimethylsilylmethyl, trimethylsilylethyl, trimethylsilylisopropyl, triisopropylsilylmethyl, triisopropylsilylethyl. Additionally, the heteroalkyl can be optionally substituted.

[0059] Alkenyl - As used herein, it encompasses straight - chain, branched - chain, and cyclic olefin groups. The alkenyl can be an alkenyl having 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 - methylethenyl, styryl, 2,2 - diphenylethenyl, 1,2 - diphenylethenyl, 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, the alkenyl can be optionally substituted.

[0060] Alkynyl - As used herein, it encompasses straight - chain alkynyl groups. The alkynyl can be an alkynyl having 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, phenylacetylenyl, phenylpropynyl, etc. Among the above, ethynyl, propynyl, propargyl, 1 - butynyl, 2 - butynyl, 3 - butynyl, 1 - pentynyl, phenylacetylenyl are preferred. Additionally, the alkynyl can be optionally substituted.

[0061] Aryl or aromatic group - As used herein, both non-fused and fused systems are contemplated. An aryl group can be an aryl group having 6 to 30 carbon atoms, preferably an aryl group having 6 to 20 carbon atoms, more preferably an aryl group having 6 to 12 carbon atoms. Examples of aryl groups include phenyl, biphenyl, terphenyl, triphenylene, tetraphenylene, naphthalene, anthracene, chrysene, phenanthrene, fluorene, pyrene, perylene and azulene, preferably phenyl, biphenyl, terphenyl, triphenylene, fluorene and naphthalene. Examples of non-fused aryl groups include phenyl, biphenyl-2-yl, biphenyl-3-yl, biphenyl-4-yl, p-terphenyl-4-yl, p-terphenyl-3-yl, p-terphenyl-2-yl, m-terphenyl-4-yl, m-terphenyl-3-yl, m-terphenyl-2-yl, o-tolyl, m-tolyl, p-tolyl, p-(2-phenylpropyl)phenyl, 4'-methylbiphenylyl, 4”-tert-butyl-p-terphenyl-4-yl, o-cumyl, m-cumyl, p-cumyl, 2,3-dimethylphenyl, 3,4-dimethylphenyl, 2,5-dimethylphenyl, mesityl and m-quaterphenyl. Additionally, the aryl group can be optionally substituted.

[0062] Heterocyclic group - As used herein, non-aromatic cyclic groups are contemplated. The non-aromatic heterocyclic group includes 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 atom, oxygen atom, sulfur atom, selenium atom, silicon atom, phosphorus atom, germanium atom and boron atom. Preferred non-aromatic heterocyclic groups are those having 3 to 7 ring atoms, which include at least one heteroatom such as nitrogen, oxygen, silicon or sulfur. Examples of non-aromatic heterocyclic groups include oxiranyl, oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, dioxolanyl, dioxanyl, aziridinyl, dihydropyrrolyl, tetrahydropyrrolyl, piperidinyl, oxazolidinyl, morpholinyl, piperazinyl, oxepinyl, thiepinyl, azepinyl and tetrahydrothienyl. Additionally, the heterocyclic group can be optionally substituted.

[0063] Heteroaryl - As used herein, it can include non - fused and fused heteroaromatic groups having 1 to 5 heteroatoms, where at least one heteroatom is selected from the group consisting of nitrogen atom, oxygen atom, sulfur atom, selenium atom, silicon atom, phosphorus atom, germanium atom, and boron atom. Heteroaryl also refers to heteroaromatic group. The heteroaryl can be a heteroaryl having 3 to 30 carbon atoms, preferably a heteroaryl having 3 to 20 carbon atoms, more preferably a heteroaryl having 3 to 12 carbon atoms. Suitable heteroaryls include dibenzothiophene, dibenzofuran, dibenzoselenophene, furan, thiophene, benzofuran, benzothiophene, benzoselenophene, carbazole, indolocarbazole, pyridoindole, pyrrolopyridine, pyrazole, imidazole, triazole, oxazole, thiazole, oxadiazole, oxatriazole, dioxazole, thiadiazole, pyridine, pyridazine, pyrimidine, pyrazine, triazine, oxazine, oxathiazine, oxadiazine, indole, benzimidazole, indazole, indenoazine, benzoxazole, benzisoxazole, benzothiazole, quinoline, isoquinoline, cinnoline, quinazoline, quinoxaline, naphthyridine, phthalazine, pteridine, xanthene, acridine, phenazine, phenothiazine, benzofuranopyridine, furanodipyridine, benzothiophenopyridine, thiophenodipyridine, benzoselenophenopyridine, selenophenodipyridine, preferably dibenzothiophene, dibenzofuran, dibenzoselenophene, carbazole, indolocarbazole, imidazole, pyridine, triazine, benzimidazole, 1,2 - azaborolane, 1,3 - azaborolane, 1,4 - azaborolane, borazole and its nitrogen - containing analogues. Additionally, the heteroaryl can be optionally substituted.

[0064] Alkoxy - As used herein, it is represented by - O - alkyl, - O - cycloalkyl, - O - heteroalkyl or - O - heterocycloalkyl. Examples and preferred examples of alkyl, cycloalkyl, heteroalkyl and heterocycloalkyl are the same as those described above. The 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, tetrahydrofuryloxy, tetrahydropyranyloxy, methoxypropyloxy, ethoxyethyloxy, methoxymethyloxy and ethoxymethyloxy. Additionally, the alkoxy can be optionally substituted.

[0065] Aryloxy - As used herein, it is represented by - O - aryl or - O - heteroaryl. Examples and preferred examples of aryl and heteroaryl are the same as those described above. The aryloxy can be an aryloxy having 6 to 30 carbon atoms, preferably an aryloxy having 6 - 20 carbon atoms. Examples of aryloxy include phenoxy and biphenyloxy. Additionally, the aryloxy can be optionally substituted.

[0066] 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,

[0067] 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.

[0068] 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.

[0069] Alkylgermyl – As used herein, it encompasses alkyl-substituted germyl groups. The alkylgermyl group can be an alkylgermyl group having 3 to 20 carbon atoms, preferably an alkylgermyl group having 3 to 10 carbon atoms. Examples of the alkylgermyl group include trimethylgermyl, triethylgermyl, methyldiethylgermyl, ethyldimethylgermyl, tripropylgermyl, tributylgermyl, triisopropylgermyl, methyldiisopropylgermyl, dimethylisopropylgermyl, tritert-butylgermyl, triisobutylgermyl, dimethyltert-butylgermyl, methylditert-butylgermyl. Additionally, the alkylgermyl group can be optionally substituted.

[0070] Arylgermyl – As used herein, it encompasses germyl groups substituted with at least one aryl or heteroaryl group. The arylgermyl group can be an arylgermyl group having 6 to 30 carbon atoms, preferably an arylgermyl group having 8 to 20 carbon atoms. Examples of the arylgermyl group include triphenylgermyl, phenyldibiphenylgermyl, diphenylbiphenylgermyl, phenyldiethylgermyl, diphenylethylgermyl, phenyldimethylgermyl, diphenylmethylgermyl, phenyldiisopropylgermyl, diphenylisopropylgermyl, diphenylbutylgermyl, diphenylisobutylgermyl, diphenyltert-butylgermyl. Additionally, the arylgermyl group can be optionally substituted.

[0071] The term "aza" in azadibenzofuran, azadibenzothiophene, etc. means that one or more C-H groups in the corresponding aromatic moiety are replaced by nitrogen atoms. 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 readily envisioned by those of ordinary skill in the art, and all such analogs are determined to be included within the terms described herein.

[0072] In the present disclosure, unless otherwise defined, when any one of the terms consisting of the following groups is used: substituted alkyl, substituted cycloalkyl, substituted heteroalkyl, substituted heterocycloalkyl, substituted aralkyl, substituted alkoxy, substituted aryloxy, substituted alkenyl, substituted alkynyl, substituted aryl, substituted heteroaryl, substituted alkylsilyl, substituted arylsilyl, substituted alkylgermyl, substituted arylgermyl, substituted amino, substituted acyl, substituted carbonyl, substituted carboxy, substituted ester, substituted sulfinyl, substituted sulfonyl, substituted phosphino, it means that any one of the groups alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, aralkyl, alkoxy, aryloxy, alkenyl, alkynyl, aryl, heteroaryl, alkylsilyl, arylsilyl, alkylgermyl, arylgermyl, amino, acyl, carbonyl, carboxy, ester, sulfinyl, sulfonyl and phosphino may be substituted by one or more substituents selected from deuterium, halogen, unsubstituted alkyl having 1-20 carbon atoms, unsubstituted cycloalkyl having 3-20 ring carbon atoms, unsubstituted heteroalkyl having 1-20 carbon atoms, unsubstituted heterocycloalkyl having 3-20 ring atoms, unsubstituted aralkyl having 7-30 carbon atoms, unsubstituted alkoxy having 1-20 carbon atoms, unsubstituted aryloxy having 6-30 carbon atoms, unsubstituted alkenyl having 2-20 carbon atoms, unsubstituted alkynyl having 2-20 carbon atoms, unsubstituted aryl having 6-30 carbon atoms, unsubstituted heteroaryl having 3-30 carbon atoms, unsubstituted alkylsilyl having 3-20 carbon atoms, unsubstituted arylsilyl having 6-20 carbon atoms, unsubstituted alkylgermyl having 3-20 carbon atoms, unsubstituted arylgermyl having 6-20 carbon atoms, unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxy, ester, cyano, isocyano, hydroxy, mercapto, sulfinyl, sulfonyl, phosphino and combinations thereof.

[0073] It should be understood that when a molecular fragment is described as a substituent or otherwise attached to another moiety, its name may be written according to whether it is a fragment (e.g., phenyl, phenylene, naphthyl, dibenzofuranyl) or according to whether it is the entire molecule (e.g., benzene, naphthalene, dibenzofuran). As used herein, these different ways of specifying a substituent or linking fragment are considered equivalent.

[0074] In the compounds mentioned in the present disclosure, the 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. Replacement of other stable isotopes in the compounds may be preferred due to their enhanced device efficiency and stability.

[0075] Among the compounds mentioned in the present disclosure, polysubstituted refers to the range including disubstituted up to the maximum available substitution. When a substituent in the compounds mentioned in the present disclosure indicates polysubstituted (including disubstituted, trisubstituted, tetrasubstituted, etc.), it means that the substituent can be present at multiple available substitution positions on its connecting structure, and the substituent present at multiple available substitution positions can be of the same structure or different structures.

[0076] Among the compounds mentioned in the present disclosure, unless explicitly defined, for example, adjacent substituents can optionally be joined to form a ring, adjacent substituents in the compound cannot be joined to form a ring. Among the compounds mentioned in the present disclosure, adjacent substituents can optionally be joined to form a ring, which includes both the case where adjacent substituents can be joined to form a ring and the case where adjacent substituents are not joined to form a ring. When adjacent substituents can optionally be joined to form a ring, the formed ring can be a monocyclic or polycyclic (including spiro ring, bridged ring, fused ring, etc.), and an alicyclic, heteroalicyclic, aromatic or heteroaromatic ring. In this expression, 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.

[0077] The expression that adjacent substituents can optionally be joined to form a ring is also intended to be understood as referring to two substituents bonded to the same carbon atom being joined to each other by a chemical bond to form a ring, which can be exemplified by the following formula:

[0078]

[0079] The expression that adjacent substituents can optionally be joined to form a ring is also intended to be understood as referring to two substituents bonded to carbon atoms directly bonded to each other being joined to each other by a chemical bond to form a ring, which can be exemplified by the following formula:

[0080]

[0081] The expression that adjacent substituents can optionally be joined to form a ring is also intended to be understood as referring to two substituents bonded to carbon atoms further away being joined to each other by a chemical bond to form a ring, which can be exemplified by the following formula:

[0082]

[0083] In addition, the expression that adjacent substituents can optionally be joined to form a ring is also intended to be understood as referring to, in the case where one of the two adjacent substituents represents hydrogen, the second substituent being bonded to the position where the hydrogen atom is bonded, thereby forming a ring. This is exemplified by the following formula:

[0084]

[0085] According to an embodiment of the present invention, an organic electroluminescent device is disclosed, which includes:

[0086] An anode,

[0087] A cathode,

[0088] And an organic layer disposed between the anode and the cathode, wherein the organic layer at least includes a first host compound, a metal complex, and a fluorescent emitting material;

[0089] The triplet energy level of the first host compound is higher than the triplet energy level of the metal complex;

[0090] The first host compound is a small molecule compound;

[0091] Wherein, the metal complex includes a metal M and a ligand L coordinated with the metal M a , the metal M is selected from metals with a relative atomic mass greater than 40, and the L a Has a structure represented by Formula 1:

[0092]

[0093] Wherein,

[0094] Ring A1 and ring A2 are each independently selected from an aromatic ring having 6 - 30 ring atoms, a heteroaromatic ring having 5 - 30 ring atoms, or a combination thereof;

[0095] E1 and E2 are each independently selected from C or N each time they appear;

[0096] G1 and G2 are each independently selected from a single bond, O, S, or NR' each time they appear;

[0097] L1 is each independently selected from the group consisting of: a single bond, BR", CR"R", NR", O, SiR"R", PR", S, GeR"R", Se, a substituted or unsubstituted vinylene group, an ethynylene group, a substituted or unsubstituted arylene group having 6 - 30 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 - 30 carbon atoms, and combinations thereof; when two R" are present simultaneously, the two R" are the same or different;

[0098] R1 and R2 are each independently selected from single - substitution, multi - substitution, or no substitution each time they appear;

[0099] R1, R2, R', and R" are each independently selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted alkynyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted alkylgermyl having 3 to 20 carbon atoms, substituted or unsubstituted arylgermyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0100] When metal M is selected from Ir, L1 is selected from a single bond, and G1, G2 are selected from a single bond, and one of ring A1 and ring A2 is selected from a benzene ring and the other is selected from a pyridine ring, R1 and R2 are each independently selected from the group consisting of: deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted alkynyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted alkylgermyl having 3 to 20 carbon atoms, substituted or unsubstituted arylgermyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0101] Adjacent substituents R1, R2, R' and R" can optionally be joined to form a ring;

[0102] The fluorescent luminescent material has a structure represented by Formula 1-1:

[0103]

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

[0105] X1 and X2 are selected from O, S, Se, BR E , NR E , CR E R E , SiR E R E ; When two Rs are present simultaneously E , the two Rs E are the same or different;

[0106] R ta ’, R tb ’, R tc ’, R td ’, R te ’ and R E are each independently selected from the group consisting of: hydrogen, deuterium, halogen, a substituted or unsubstituted alkyl group having 1-20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3-20 ring carbon atoms, a substituted or unsubstituted heteroalkyl group having 1-20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3-20 ring atoms, a substituted or unsubstituted aralkyl group having 7-30 carbon atoms, a substituted or unsubstituted alkoxy group having 1-20 carbon atoms, a substituted or unsubstituted aryloxy group having 6-30 carbon atoms, a substituted or unsubstituted alkenyl group having 2-20 carbon atoms, a substituted or unsubstituted aryl group having 6-30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3-30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3-20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6-20 carbon atoms, a substituted or unsubstituted alkylgermyl group having 3-20 carbon atoms, a substituted or unsubstituted arylgermyl group having 6-20 carbon atoms, a substituted or unsubstituted amino group having 0-20 carbon atoms, acyl group, carbonyl group, carboxyl group, ester group, cyano group, isocyano group, hydroxyl group, mercapto group, sulfinyl group, sulfonyl group, phosphino group, -BR t ”R t ”, and combinations thereof;

[0107] R t”Each occurrence is the same or different and is selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclic group having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermyl having 3-20 carbon atoms, substituted or unsubstituted arylgermyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0108] Adjacent substituents R ta ’, R tb ’, R tc ’, R td ’, R te ’, R t ” and R E can optionally be linked to form a ring.

[0109] As used herein, the term "small molecule compound" is a concept well known to those skilled in the art. As described in the background art of this application, it refers to a compound that is not a polymer. The "small molecule compound" herein is preferably an organic or organometallic compound having a precise structure.

[0110] As used herein, the phrase "adjacent substituents R1, R2, R' and R" can optionally be linked to form a ring" is intended to mean any adjacent substituent groups, for example, between two substituents R1, between two substituents R2, between two substituents R', between two substituents R", between substituent R1 and R2, between substituent R' and R1, between substituent R' and R2, between substituent R" and R1, between substituent R" and R2, between substituent R' and R". Any one or more of these substituent groups can be linked to form a ring. Obviously, these substituents may also not be linked to form a ring at all.

[0111] As used herein, "adjacent substituents R ta ’, R tb ’, R tc ’, R td ’,Rte ’, R t ” and R E The phrase “optionally joined to form a ring” is intended to mean that among adjacent substituent groups, for example, between two substituents R ta ’, between two substituents R tb ’, between two substituents R tc ’, between two substituents R td ’, between two substituents R te ’, between two substituents R t ”, between two substituents R E , between a substituent R E and R te ’, between a substituent R E and R ta ’, between a substituent R E and R tb ’, between a substituent R E and R tc ’, between a substituent R td ’ and R te ’, between a substituent R td ’ and R tc ’, between a substituent R ta ’ and R tb ’, any one or more of these substituent groups may be joined to form a ring. Preferably, one or more of these substituents may be joined to form a carbocyclic ring (which may be aromatic or non-aromatic) or a heterocyclic ring (which may be aromatic or non-aromatic); more preferably, a carbocyclic ring or a heterocyclic ring having 3 - 24 ring atoms may be formed by joining; still more preferably, a carbocyclic ring or a heterocyclic ring having 5 - 12 ring atoms may be formed by joining; still more preferably, a monocyclic carbocyclic ring or a monocyclic heterocyclic ring having 5 - 6 ring atoms may be formed by joining. Obviously, these substituents may also not be joined to form a ring with each other.

[0112] As used herein, “carbocyclic ring” includes saturated carbocyclic rings and unsaturated carbocyclic rings, “unsaturated carbocyclic ring” includes aromatic unsaturated carbocyclic rings and non-aromatic unsaturated carbocyclic rings, “heterocyclic ring” includes saturated heterocyclic rings and unsaturated heterocyclic rings, and “unsaturated heterocyclic ring” includes aromatic unsaturated heterocyclic rings and non-aromatic unsaturated heterocyclic rings.

[0113] As used herein, when L1 is selected from a single bond, it indicates that ring A1 and ring A2 are directly connected by a single bond. When G1 or G2 is selected from a single bond, it indicates that ring A1 or ring A2 is directly connected to metal M by a single bond.

[0114] In this text, in Formula 1, the connection manner of L1 and rings A1 and A2 is intended to represent that in Formula 1, L1 can be connected to any ring atom in ring A1 or ring A2, and not only includes the case where L1 is connected to the atom adjacent to E1 in ring A1 or the atom adjacent to E2 in ring A2.

[0115] According to an embodiment of the present invention, wherein the relative molecular weight of the fluorescent luminescent material is between 450 and 1500.

[0116] According to an embodiment of the present invention, wherein the relative molecular weight of the fluorescent luminescent material is between 500 and 1300.

[0117] According to an embodiment of the present invention, wherein the relative molecular weight of the fluorescent luminescent material is between 800 and 1200.

[0118] According to an embodiment of the present invention, wherein the relative molecular weight of the fluorescent luminescent material is between 600 and 1000.

[0119] According to an embodiment of the present invention, wherein rings A, B, C, D, and E are each independently selected from a five-membered unsaturated carbon ring, an aromatic ring having 6 to 30 carbon atoms, or a heteroaromatic ring having 3 to 30 carbon atoms each time they appear.

[0120] According to an embodiment of the present invention, wherein rings A, B, C, D, and E are each independently selected from a five-membered unsaturated carbon ring, an aromatic ring having 6 to 18 carbon atoms, or a heteroaromatic ring having 3 to 18 carbon atoms each time they appear.

[0121] According to an embodiment of the present invention, wherein rings A, B, C, D, and E are each independently selected from a benzene ring, a pyridine ring, a naphthalene ring, a phenanthrene ring, an anthracene ring, an indene ring, a fluorene ring, an indole ring, a carbazole ring, a benzofuran ring, a dibenzofuran ring, a benzosilole ring, a dibenzosilole ring, a benzothiophene ring, a dibenzothiophene ring, a dibenzoselenophene ring, a cyclopentadiene ring, a furan ring, a thiophene ring, a silole ring, or a combination thereof each time they appear.

[0122] According to an embodiment of the present invention, wherein X1 and X2 are each independently selected from O, S, Se, or NR each time they appear E 。

[0123] According to an embodiment of the present invention, wherein X1 and X2 are each independently selected from O or NR each time they appear E 。

[0124] According to an embodiment of the present invention, wherein the fluorescent luminescent material has a structure represented by Formula 2-1, Formula 2-2, Formula 2-3, Formula 2-4, Formula 2-5, or Formula 2-6:

[0125]

[0126]

[0127] R ta ’, R tb ’, R tc ’, R td ’, R te ’, R te1 ’ and R te2 ’ each independently represents, when it appears, a mono-substituted, multi-substituted or unsubstituted group;

[0128] R ta ’, R tb ’, R tc ’, R td ’, R te ’, R te1 ’ and R te2 ’ each independently represents, when it appears, a member selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 - 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 - 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 - 20 carbon atoms, substituted or unsubstituted heterocyclic group having 3 - 20 ring atoms, substituted or unsubstituted aralkyl having 7 - 30 carbon atoms, substituted or unsubstituted alkoxy having 1 - 20 carbon atoms, substituted or unsubstituted aryloxy having 6 - 30 carbon atoms, substituted or unsubstituted alkenyl having 2 - 20 carbon atoms, substituted or unsubstituted aryl having 6 - 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 - 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 - 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 - 20 carbon atoms, substituted or unsubstituted alkylgermyl having 3 - 20 carbon atoms, substituted or unsubstituted arylgermyl having 6 - 20 carbon atoms, substituted or unsubstituted amino having 0 - 20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, -BR t ”R t ”, and combinations thereof;

[0129] R t”Each time it appears, it is the same or different and is selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 - 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 - 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 - 20 carbon atoms, substituted or unsubstituted heterocyclic group having 3 - 20 ring atoms, substituted or unsubstituted aralkyl having 7 - 30 carbon atoms, substituted or unsubstituted alkoxy having 1 - 20 carbon atoms, substituted or unsubstituted aryloxy having 6 - 30 carbon atoms, substituted or unsubstituted alkenyl having 2 - 20 carbon atoms, substituted or unsubstituted aryl having 6 - 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 - 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 - 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 - 20 carbon atoms, substituted or unsubstituted alkylgermyl having 3 - 20 carbon atoms, substituted or unsubstituted arylgermyl having 6 - 20 carbon atoms, substituted or unsubstituted amino having 0 - 20 carbon atoms, acyl group, carbonyl group, carboxyl group, ester group, cyano group, isocyano group, hydroxyl group, mercapto group, sulfinyl group, sulfonyl group, phosphino group, and combinations thereof;

[0130] Adjacent substituents R ta ’, R tb ’, R tc ’, R td ’, R te ’, R t ”, R te1 ’, R te2 ’ can optionally be linked to form a ring.

[0131] As used herein, “adjacent substituents R ta ’, R tb ’, R tc ’, R td ’, R te ’, R t ”, R te1 ’ and R te2 ’ can optionally be linked to form a ring” is intended to mean that among adjacent substituent groups, for example, between two substituents R ta ’, between two substituents R tb ’, between two substituents R tc ’, between two substituents R td ’, between two substituents R te ’, between two substituents R t ”, between two substituents R te1 ’, between two substituents R te2 ’, between substituent R te1 ’ and R te ’, between substituent R te1’ and R ta ’ and the substituent R te2 ’ and R tb ’ and the substituent R te2 ’ and R tc ’ and the substituent R td ’ and R te ’ and the substituent R td ’ and R tc ’ and the substituent R ta ’ and R tb ’ and R Among any one or more of these substituent groups, they can be connected to form a ring. Obviously, they can also not be connected to form a ring among these substituents.

[0132] According to an embodiment of the present invention, wherein R ta ’, R tb ’, R tc ’, R td ’, R te ’, R t ”, R te1 ’, R te2 ’ are the same or different each time they appear and are selected from the group consisting of: hydrogen, deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl having 1 - 6 carbon atoms, substituted or unsubstituted cycloalkyl having 3 - 6 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 - 6 carbon atoms, substituted or unsubstituted aryl having 6 - 24 carbon atoms, substituted or unsubstituted heteroaryl having 3 - 12 carbon atoms, substituted or unsubstituted alkylsilyl having 3 - 6 carbon atoms, substituted or unsubstituted arylsilyl having 6 - 12 carbon atoms, substituted or unsubstituted alkylgermyl having 3 - 6 carbon atoms, substituted or unsubstituted arylgermyl having 6 - 12 carbon atoms, substituted or unsubstituted amino having 0 - 12 carbon atoms, and combinations thereof.

[0133] According to an embodiment of the present invention, wherein R ta ’, R tb ’, R tc ’, R td ’, R te ’, R t ”, R te1 ’, R te2’Each occurrence is the same or different and is selected from the group consisting of: hydrogen, deuterium, fluorine, cyano, hydroxyl, mercapto, methyl, ethyl, n-propyl, isopropyl, cyclopropyl, n-butyl, isobutyl, tert-butyl, cyclopentyl, neopentyl, cyclohexyl, trimethylsilyl, trimethylgermyl, phenyl, biphenyl, terphenyl, quaterphenyl, triphenylene, tetraphenylene, naphthyl, phenanthryl, anthryl, indyl, fluorenyl, indolyl, carbazolyl, benzofuranyl, dibenzofuranyl, benzosilolyl, dibenzosilolyl, benzothiophenyl, dibenzothiophenyl, dibenzoselenophenyl, diphenylamino, dibenzofuranylphenylamino, and combinations thereof.

[0134] According to one embodiment of the present invention, wherein R ta ’, R tb ’, R tc ’, R td ’, R te ’, R t ”, R te1 ’, R te2 ’At least one of them is the same or different each occurrence and 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 heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclic group having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermyl having 3-20 carbon atoms, substituted or unsubstituted arylgermyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof.

[0135] According to one embodiment of the present invention, wherein R ta ’, R tb ’, R tc ’, R td ’, R te ’, R t ”, R te1 ’, R te2At least one of them is the same or different each time it appears and is selected from the group consisting of: deuterium, halogen, cyano, hydroxy, mercapto, substituted or unsubstituted alkyl having 1-6 carbon atoms, substituted or unsubstituted cycloalkyl having 3-6 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-6 carbon atoms, substituted or unsubstituted aryl having 6-24 carbon atoms, substituted or unsubstituted heteroaryl having 3-12 carbon atoms, substituted or unsubstituted alkylsilyl having 3-6 carbon atoms, substituted or unsubstituted arylsilyl having 6-12 carbon atoms, substituted or unsubstituted alkylgermyl having 3-6 carbon atoms, substituted or unsubstituted arylgermyl having 6-12 carbon atoms, substituted or unsubstituted amino having 0-12 carbon atoms, and combinations thereof.

[0136] According to one embodiment of the present invention, wherein R ta ’, R tb ’, R tc ’, R td ’, R te ’, R t ”, R te1 ’, R te2 ’ is at least one of the same or different each time it appears and is selected from the group consisting of: deuterium, fluorine, cyano, hydroxy, mercapto, methyl, ethyl, n-propyl, isopropyl, cyclopropyl, n-butyl, isobutyl, tert-butyl, cyclopentyl, neopentyl, cyclohexyl, trimethylsilyl, trimethylgermyl, phenyl, biphenyl, terphenyl, quaterphenyl, triphenylene, tetraphenylene, naphthyl, phenanthryl, anthryl, indanyl, fluorenyl, indolyl, carbazolyl, benzofuranyl, dibenzofuranyl, benzosilolyl, dibenzosilolyl, benzothiophenyl, dibenzothiophenyl, dibenzoselenophenyl, diphenylamino, dibenzofuranylphenylamino, and combinations thereof.

[0137] According to one embodiment of the present invention, wherein the fluorescent luminescent material is selected from the group consisting of Compound BD-1 to Compound BD-54, and the specific structures of Compound BD-1 to Compound BD-54 are shown in Claim 7.

[0138] According to one embodiment of the present invention, wherein the hydrogen in Compound BD-1 to Compound BD-54 can be partially or completely deuterated.

[0139] According to one embodiment of the present invention, wherein the fluorescent luminescent material is selected from the group consisting of Compound BD-1 to Compound BD-215, and the specific structures of Compound BD-1 to Compound BD-215 are shown in Claim 7.

[0140] According to one embodiment of the present invention, wherein the hydrogen in Compound BD-1 to Compound BD-215 can be partially or completely deuterated.

[0141] According to one embodiment of the present invention, wherein the metal complex has the general formula M(L a ) m (L b ) n (L c ) q , where L a , L b and L c are the first, second and third ligands coordinated to the metal M respectively, and L a and the said L c or L b are the same or different; wherein, L a , L b and L c can optionally be connected to form a polydentate ligand; the metal M is selected from metals with a relative atomic mass greater than 40;

[0142] m is selected from 1, 2 or 3, n is selected from 0, 1 or 2, q is selected from 0, 1 or 2, and m + n + q is equal to the oxidation state of the metal M; when m is greater than or equal to 2, the multiple L a are the same or different; when n is equal to 2, the two L b are the same or different; when q is equal to 2, the two L c are the same or different;

[0143] L b and L c are each independently selected from the group consisting of the following structures:

[0144]

[0145] wherein,

[0146] X b is each independently selected from the group consisting of: O, S, Se, NR N1 , CR C1 R C2 ;

[0147] X c and X d are each independently selected from the group consisting of: O, S, Se and NR N2 ;

[0148] R a and R b each independently represent mono-substituted, multi-substituted, or unsubstituted;

[0149] R a , R b, R c , R N1 , R N2 , R C1 and R C2 each occurrence of which is the same as or different from and is independently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted alkynyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted alkylgermyl having 3 to 20 carbon atoms, substituted or unsubstituted arylgermyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0150] Adjacent substituents R a , R b , R c , R N1 , R N2 , R C1 and R C2 can optionally be linked to form a ring.

[0151] As used herein, the phrase “adjacent substituents R a , R b , R c , R N1 , R N2 , R C1 and R C2 can optionally be linked to form a ring” is intended to mean that among adjacent groups of substituents, for example, between two substituents R a , between two substituents R b , between two substituents R c , between substituent R a and R b , between substituent R a and R c , between substituent R b and R c , between substituent R aand 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 between, any one or more of these substituent groups may be connected to form a ring. For example, the adjacent substituents R a , R b can optionally be connected to form a ring, which can form one or more of the following structures including but not limited to:

[0152] wherein, W is selected from O, S, Se, NR w or CR w R w ; wherein the R w , R a ’, R b ’ are defined the same as the R a . Obviously, these substituents may not be connected to form a ring either.

[0153] According to an embodiment of the present invention, wherein the metal M is selected from the group consisting of Cu, Ag, Au, Ru, Rh, Pd, Os, Ir and Pt.

[0154] According to an embodiment of the present invention, wherein the metal M is selected from Pt or Ir.

[0155] According to an embodiment of the present invention, wherein the metal complex has the general formula structure of Ir(L a ) m (L b ) 3-m , and has the structure represented by formula M-a:

[0156]

[0157] wherein,

[0158] m is selected from 1, 2 or 3; when m is selected from 1, two Lb identical or different; when m is selected from 2 or 3, a plurality of Ls a identical or different;

[0159] Ring A1 is selected from heteroaryl rings having 5 - 30 ring atoms;

[0160] Ring A2 is selected from aromatic rings having 6 - 30 ring atoms, heteroaryl rings having 5 - 30 ring atoms, or combinations thereof;

[0161] Each occurrence of U1 to U8 is independently selected from CR u or N;

[0162] R1 and R2 each occurrence is independently selected from mono - substituted, multi - substituted or unsubstituted;

[0163] R1, R2 and R u Each occurrence is independently selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 - 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 - 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 - 20 carbon atoms, substituted or unsubstituted heterocyclic group having 3 - 20 ring atoms, substituted or unsubstituted aralkyl having 7 - 30 carbon atoms, substituted or unsubstituted alkoxy having 1 - 20 carbon atoms, substituted or unsubstituted aryloxy having 6 - 30 carbon atoms, substituted or unsubstituted alkenyl having 2 - 20 carbon atoms, substituted or unsubstituted alkynyl having 2 - 20 carbon atoms, substituted or unsubstituted aryl having 6 - 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 - 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 - 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 - 20 carbon atoms, substituted or unsubstituted alkylgermyl having 3 - 20 carbon atoms, substituted or unsubstituted arylgermyl having 6 - 20 carbon atoms, substituted or unsubstituted amino having 0 - 20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0164] When ring A1 is selected from a pyridine ring and ring A2 is selected from a benzene ring, at least one of R1 and R2 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 heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclic group having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted alkynyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermyl having 3-20 carbon atoms, substituted or unsubstituted arylgermyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0165] The adjacent substituents R1, R2 and R u can optionally be linked to form a ring.

[0166] In this embodiment, the statement that "the adjacent substituents R1, R2 and R u can optionally be linked to form a ring" is intended to mean that, for example, between two substituents R1, between two substituents R2, between two substituents R u between, between substituent R1 and R2, between substituent R1 and R u between, between substituent R2 and R u between, any one or more of these groups of substituents can be linked to form a ring, and obviously, these substituents may also not be linked to form a ring.

[0167] According to one embodiment of the present invention, wherein ring A1 is the same or different each time it appears and is selected from any one of the following structures:

[0168]

[0169] wherein,

[0170] R1 is the same or different each time it appears and represents mono-substituted, multi-substituted, or unsubstituted; when there are multiple R1s in any one structure, the R1s are the same or different;

[0171] R1, each occurrence being the same or different, is selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 - 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 - 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 - 20 carbon atoms, substituted or unsubstituted heterocyclic group having 3 - 20 ring atoms, substituted or unsubstituted aralkyl having 7 - 30 carbon atoms, substituted or unsubstituted alkoxy having 1 - 20 carbon atoms, substituted or unsubstituted aryloxy having 6 - 30 carbon atoms, substituted or unsubstituted alkenyl having 2 - 20 carbon atoms, substituted or unsubstituted alkynyl having 2 - 20 carbon atoms, substituted or unsubstituted aryl having 6 - 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 - 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 - 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 - 20 carbon atoms, substituted or unsubstituted alkylgermyl having 3 - 20 carbon atoms, substituted or unsubstituted arylgermyl having 6 - 20 carbon atoms, substituted or unsubstituted amino having 0 - 20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0172] Adjacent substituents R1 can optionally be joined to form a ring;

[0173] wherein, “#” represents the position connected to the metal Ir, represents the position connected to the ring A2.

[0174] According to one embodiment of the present invention, wherein, ring A1, each occurrence being the same or different, is selected from any of the following structures:

[0175]

[0176] According to one embodiment of the present invention, wherein, ring A1, each occurrence being the same or different, is selected from

[0177] According to one embodiment of the present invention, wherein, ring A2, each occurrence being the same or different, is selected from any of the following structures:

[0178]

[0179] wherein,

[0180] Z, each occurrence being the same or different, is selected from the group consisting of O, S, Se, NR, CRR, SiRR, and GeRR;

[0181] R2, each occurrence, independently represents a mono-substituted, multi-substituted, or unsubstituted group; when there are multiple R2 groups in any structure, the R2 groups can be the same or different;

[0182] R and R2, each occurrence, independently is selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 - 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 - 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 - 20 carbon atoms, substituted or unsubstituted heterocyclic group having 3 - 20 ring atoms, substituted or unsubstituted aralkyl having 7 - 30 carbon atoms, substituted or unsubstituted alkoxy having 1 - 20 carbon atoms, substituted or unsubstituted aryloxy having 6 - 30 carbon atoms, substituted or unsubstituted alkenyl having 2 - 20 carbon atoms, substituted or unsubstituted alkynyl having 2 - 20 carbon atoms, substituted or unsubstituted aryl having 6 - 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 - 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 - 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 - 20 carbon atoms, substituted or unsubstituted alkylgermyl having 3 - 20 carbon atoms, substituted or unsubstituted arylgermyl having 6 - 20 carbon atoms, substituted or unsubstituted amino having 0 - 20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0183] Adjacent substituents R and R2 can optionally be joined to form a ring;

[0184] wherein, "#" represents the position connected to the metal Ir, represents the position connected to the ring A1.

[0185] According to one embodiment of the present invention, wherein the ring A2 is selected from

[0186] According to one embodiment of the present invention, wherein the metal complex has the general formula structure of Ir(L a ) m (L b ) 3-m and has the structure represented by Formula M - a - 1:

[0187]

[0188] wherein,

[0189] m is selected from 1, 2, or 3; when m is selected from 1, the two L b are the same or different; when m is selected from 2 or 3, the 2 or 3 L a are the same or different;

[0190] U1 to U8 are the same as or different from each other each time they appear and are selected from CR u or N;

[0191] R1 and R2 are the same as or different from each other each time they appear and represent mono-substituted, multi-substituted or unsubstituted;

[0192] R1, R2 and R u are the same as or different from each other each time they appear and are selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclic group having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted alkynyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermyl having 3-20 carbon atoms, substituted or unsubstituted arylgermyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0193] At least one of R1 and R2 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 heteroalkyl having 1 - 20 carbon atoms, substituted or unsubstituted heterocyclic group having 3 - 20 ring atoms, substituted or unsubstituted aralkyl having 7 - 30 carbon atoms, substituted or unsubstituted alkoxy having 1 - 20 carbon atoms, substituted or unsubstituted aryloxy having 6 - 30 carbon atoms, substituted or unsubstituted alkenyl having 2 - 20 carbon atoms, substituted or unsubstituted alkynyl having 2 - 20 carbon atoms, substituted or unsubstituted aryl having 6 - 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 - 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 - 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 - 20 carbon atoms, substituted or unsubstituted alkylgermyl having 3 - 20 carbon atoms, substituted or unsubstituted arylgermyl having 6 - 20 carbon atoms, substituted or unsubstituted amino having 0 - 20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0194] Adjacent substituents R1, R2 and R u can optionally be linked to form a ring.

[0195] According to one embodiment of the present invention, when R1 is polysubstituted, at least one of the occurrences of R1 is the same or different and is selected from: 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, cyano, and combinations thereof.

[0196] According to one embodiment of the present invention, U1 to U8 are the same or different each time they occur and are selected from CR u , R2, R u which are the same or different each time they occur and are 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, cyano, and combinations thereof.

[0197] According to one embodiment of the present invention, the metal complex has a general formula structure of Ir(L a ) m (L b ) 3-m and has a structure represented by formula M - a - 0:

[0198]

[0199] wherein,

[0200] m is selected from 1, 2 or 3; when m is selected from 1, the two Ls b are the same or different; when m is selected from 2 or 3, the two or three Ls a are the same or different;

[0201] Z is selected from the group consisting of O, S, Se, NR, CRR, SiRR and GeRR; when there are multiple Rs, each R is the same or different;

[0202] X3 to X8 are each independently selected from CR’2 or N;

[0203] Y’1 to Y’4 are each independently selected from CR’1 or N;

[0204] R a and R b each independently represent mono-substituted, multi-substituted, or unsubstituted when they appear;

[0205] R’1, R’2, R, R a and R b each independently selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclic group having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted alkynyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermyl having 3-20 carbon atoms, substituted or unsubstituted arylgermyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0206] Adjacent substituents R’1, R’2, R, R a and R b can optionally be connected to form a ring.

[0207] In this embodiment, "adjacent substituents R'1, R'2, R, R a , R b can optionally be connected to form a ring" is intended to mean that, for example, between two substituents R'1, between two substituents R'2, between two substituents R, between two substituents R a , between two substituents R b , between two substituents R'1 and R'2, between substituent R and R'1, between substituent R and R'2, any one or more of these substituent groups can be connected to form a ring. Obviously, these substituents may also not be connected to form a ring at all.

[0208] According to one embodiment of the present invention, wherein Z is selected from O, S, Se, NR or CRR.

[0209] According to one embodiment of the present invention, wherein Z is selected from O or S.

[0210] According to one embodiment of the present invention, wherein Y'1 to Y'4 each occurrence is the same or different and is selected from CR'1, and X3-X8 each occurrence is the same or different and is selected from CR'2; R'1, R'2 each occurrence is the same or different and is 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, substituted or unsubstituted amino having 0-20 carbon atoms, cyano, hydroxyl, mercapto, and combinations thereof.

[0211] According to one embodiment of the present invention, wherein at least one of X3-X8 is selected from N.

[0212] According to one embodiment of the present invention, wherein X8 is selected from N, and X3-X7 each occurrence is the same or different and is selected from CR'2, and R'2 each occurrence is the same or different and is 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, substituted or unsubstituted amino having 0-20 carbon atoms, cyano, hydroxyl, mercapto, and combinations thereof.

[0213] According to one embodiment of the present invention, at least one of X3-X8 is selected from CR’2, and R’2 is selected from cyano or fluoro.

[0214] According to one embodiment of the present invention, X7 is selected from CR’2, and R’2 is selected from cyano or fluoro; or X8 is selected from CR’2, and R’2 is selected from cyano.

[0215] According to one embodiment of the present invention, the metal complex has a structure represented by formula M-b:

[0216]

[0217] Each occurrence of ring A1 to ring A4 is the same or different and is selected from an aromatic ring having 6-30 ring atoms, a heteroaromatic ring having 5-30 ring atoms, or a combination thereof;

[0218] Each occurrence of E1 to E4 is the same or different and is selected from C or N;

[0219] Each occurrence of G1 to G4 is the same or different and is selected from a single bond, O, S or NR’;

[0220] Each occurrence of L1 to L4 is the same or different and is selected from the group consisting of: a single bond, BR”, CR”R”, NR”, O, SiR”R”, PR”, S, GeR”R”, Se, a substituted or unsubstituted vinylene group, an ethynylene group, a substituted or unsubstituted arylene group having 6-30 carbon atoms, a substituted or unsubstituted heteroarylene group having 3-30 carbon atoms, and combinations thereof; when two R” are present simultaneously, the two R” are the same or different;

[0221] Each occurrence of a2 to a4 is the same or different and is selected from 0 or 1, and at least one of a2-a4 is selected from 1;

[0222] Each occurrence of R1 to R4 is the same or different and represents mono-substituted, multi-substituted or unsubstituted;

[0223] R1 to R4, R' and R" are each independently selected, each time they occur, from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclic group having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted alkynyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermyl having 3-20 carbon atoms, substituted or unsubstituted arylgermyl having 6-20 carbon atoms, substituted or unsubstituted amino group having 0-20 carbon atoms, acyl group, carbonyl group, carboxyl group, ester group, cyano group, isocyano group, hydroxyl group, mercapto group, sulfinyl group, sulfonyl group, phosphino group, and combinations thereof;

[0224] Adjacent substituents R1 to R4, R' and R" can optionally be linked to form a ring.

[0225] As used herein, the statement "adjacent substituents R1 to R4, R' and R" can optionally be linked to form a ring" is intended to mean that among adjacent substituent groups, for example, between two substituents R1, between two substituents R2, between two substituents R3, between two substituents R4, between two substituents R", between two substituents R', between substituent R1 and R2, between substituent R1 and R4, between substituent R2 and R3, between substituent R3 and R4, between substituent R' and R1, between substituent R' and R2, between substituent R' and R3, between substituent R' and R4, between substituent R" and R1, between substituent R" and R2, between substituent R" and R3, between substituent R" and R4, any one or more of these substituent groups can be linked to form a ring. Obviously, these substituents may also not be linked to form a ring at all.

[0226] According to one embodiment of the present invention, ring A1 to ring A4 are each independently selected, each time they occur, from an aromatic ring having 6-18 ring atoms, a heteroaromatic ring having 5-18 ring atoms, or a combination thereof.

[0227] According to one embodiment of the present invention, one or two of ring A1 to ring A4 contain a 5-membered heteroaromatic ring structure, and the remainder of ring A1 to ring A4 are selected from an aromatic ring having 6 ring atoms, or a heteroaromatic ring having 6 ring atoms.

[0228] According to one embodiment of the present invention, ring A1 and ring A3 are each independently selected from aromatic rings having 6 ring atoms, ring A2 is selected from heteroaromatic rings having 9 ring atoms, and ring A4 is selected from heteroaromatic rings having 6 ring atoms.

[0229] According to one embodiment of the present invention, each occurrence of rings A1 to A4 is independently selected from the group consisting of: pyrrole ring, furan ring, thiophene ring, selenophene ring, imidazole ring, imidazolium carbene ring, oxazole ring, thiazole ring, selenazole ring, benzene ring, pyridine ring, pyrimidine ring, pyrazine ring, pyridazine ring, triazine ring, benzopyrrole ring, benzofuran ring, benzothiophene ring, benzoselenophene ring, benzimidazole ring, benzimidazolium carbene ring, benzoxazole ring, benzothiazole ring, benzoselenazole ring, fluorene ring, carbazole ring, dibenzofuran ring, dibenzothiophene ring, dibenzoselenophene ring, azafluorene ring, azacarbazole ring, aza-dibenzofuran ring, aza-dibenzothiophene ring, aza-dibenzoselenophene ring, and combinations thereof.

[0230] According to one embodiment of the present invention, ring A1 and ring A3 are each independently selected from benzene rings, ring A2 is selected from benzimidazole rings, and ring A4 is selected from pyridine rings.

[0231] According to one embodiment of the present invention, ring A1 is selected from benzene rings, ring A2 is selected from benzimidazole rings, ring A3 is selected from dibenzofuran rings, and ring A4 is selected from pyridine rings.

[0232] According to one embodiment of the present invention, each occurrence of L1 to L4 is independently selected from single bonds, NR', O, and S.

[0233] According to one embodiment of the present invention, each occurrence of a2 - a4 is independently selected from 0 or 1, and at least two of a2 - a4 are selected from 1.

[0234] According to one embodiment of the present invention, a4 is selected from 0, a2 to a3 are selected from 1; each occurrence of L1 to L3 is selected from single bonds.

[0235] According to one embodiment of the present invention, each occurrence of G1 to G4 is independently selected from single bonds, O, S, or NR", and at least two of G1 to G4 are selected from single bonds.

[0236] According to one embodiment of the present invention, each occurrence of G1 to G4 is independently selected from single bonds, O, S, or NR", and at least three of G1 to G4 are selected from single bonds.

[0237] According to one embodiment of the present invention, G1 is selected from O, and each occurrence of G2 - G4 is independently selected from single bonds.

[0238] According to an embodiment of the present invention, the metal complex has a structure represented by Formula M-b-1:

[0239]

[0240] Wherein,

[0241] Ring A1, Ring A 22 , Ring A3, Ring A4 are each independently selected from an aromatic ring having 6 - 30 ring atoms, a heteroaromatic ring having 5 - 30 ring atoms, or a combination thereof;

[0242] Ring A 21 is selected from a heteroaromatic ring having 5 ring atoms;

[0243] E1 to E4 are each independently selected from C or N;

[0244] G1 is each independently selected from O or S;

[0245] Y1, Y4, Y 11 are each independently selected from CR”’, N, NR”’, O or S;

[0246] Y2, Y3, Y5 to Y 10 are each independently selected from C or N;

[0247] R1 to R4 each independently represent mono-substituted, multi-substituted or unsubstituted;

[0248] R1 to R4 and R''' are each independently selected, each time they appear, from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted alkynyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted alkylgermyl having 3 to 20 carbon atoms, substituted or unsubstituted arylgermyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0249] Adjacent substituents R1 to R4 and R''' can optionally be linked to form a ring.

[0250] In this embodiment, the statement "Adjacent substituents R1 to R4 and R''' can optionally be linked to form a ring" is intended to mean that among adjacent substituent groups, for example, between two R1 substituents, between two R2 substituents, between two R3 substituents, between two R4 substituents, between two R''' substituents, between R1 and R2 substituents, between R1 and R4 substituents, between R2 and R3 substituents, between R3 and R4 substituents, between R''' and R1 substituents, between R''' and R2 substituents, between R''' and R3 substituents, between R''' and R4 substituents, any one or more of these substituent groups can be linked to form a ring. Obviously, these substituents may also not be linked to form a ring at all.

[0251] According to one embodiment of the present invention, G1 is selected from O; E1 and E3 are selected from C; E2 and E4 are selected from N.

[0252] According to one embodiment of the present invention, in M-b-1, ring A1, ring A 22 , ring A3, and ring A4 are each independently selected, each time they appear, from an aromatic ring having 6 to 18 ring atoms, a heteroaromatic ring having 5 to 18 ring atoms, or a combination thereof; ring A 21 is each independently selected, each time it appears, from a heteroaromatic ring having 5 ring atoms.

[0253] According to an embodiment of the present invention, in M-b-1, ring A1, ring A 22 , ring A3 is selected from benzene rings, ring A4 is selected from pyridine rings, ring A 21 is selected from imidazole rings.

[0254] According to an embodiment of the present invention, in M-b-1, ring A1, ring A 22 is selected from benzene rings, ring A3 is selected from dibenzofuran rings, ring A4 is selected from pyridine rings, ring A 21 is selected from imidazole rings.

[0255] According to an embodiment of the present invention, in formula M-b-1, Y2, Y3, Y5 to Y 10 are the same or different each time they appear and are selected from C; Y1, Y 11 are the same or different each time they appear and are selected from CR”’, and each R”’ is the same or different each time it appears and is 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, cyano, and combinations thereof.

[0256] According to an embodiment of the present invention, the metal complex has a structure represented by formula M-b-2:

[0257]

[0258] Wherein, in formula M-b-2,

[0259] Y4 is the same or different each time it appears and is selected from NR”’, O or S;

[0260] R1 to R4 are the same or different each time they appear and represent mono-substituted, multi-substituted or unsubstituted;

[0261] R1 to R4, and each occurrence of R''' is the same as or different from each other and is independently selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted alkynyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted alkylgermyl having 3 to 20 carbon atoms, substituted or unsubstituted arylgermyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0262] Adjacent substituents R1 to R4, and R''' can optionally be linked to form a ring.

[0263] According to one embodiment of the present invention, in formula M-b-1 and formula M-b-2, each occurrence of Y4 is the same as or different from each other and is independently selected from NR''', O or S; each occurrence of R''' is the same as or different from each other and is independently selected from the group consisting of: hydrogen, deuterium, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, and combinations thereof.

[0264] According to one embodiment of the present invention, in formula M-b-1 and formula M-b-2, each occurrence of Y4 is the same as or different from each other and is independently selected from NR''', and each occurrence of R''' is the same as or different from each other and is independently selected from substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, or combinations thereof.

[0265] According to one embodiment of the present invention, wherein R1 to R4 are each independently selected, each time they appear, 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 alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted alkylgermyl having 3 to 20 carbon atoms, substituted or unsubstituted arylgermyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, cyano, hydroxy, mercapto, and combinations thereof.

[0266] According to one embodiment of the present invention, wherein at least one of R1, at least one of R2, at least one of R3, or at least one of R4 is each independently selected, each time they appear, 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, cyano, and combinations thereof.

[0267] According to one embodiment of the present invention, wherein the metal complex is selected from the group consisting of M-a1 to M-a64, M-b1 to M-b62, and the specific structures of M-a1 to M-a64, M-b1 to M-b62 are shown in claim 24.

[0268] According to one embodiment of the present invention, wherein the metal complex is selected from the group consisting of M-a65 to M-a92, and the specific structures of M-a65 to M-a92 are shown as follows:

[0269]

[0270]

[0271]

[0272]

[0273] According to one embodiment of the present invention, wherein the maximum emission wavelength in the photoluminescence spectrum of the fluorescent luminescent material is λ max2 , 500 nm < λ max2 ≤ 600 nm.

[0274] According to an embodiment of the present invention, the maximum emission wavelength in the photoluminescence spectrum of the fluorescent luminescent material is λ max2 , 510 nm ≤ λ max2 ≤ 560 nm.

[0275] According to an embodiment of the present invention, the maximum emission wavelength in the photoluminescence spectrum of the metal complex is λ max1 , and the maximum emission wavelength in the photoluminescence spectrum of the fluorescent luminescent material is λ max2 , λ max1 ≤ λ max2 , or 0 nm < λ max1 -λ max2 ≤ 30 nm.

[0276] According to an embodiment of the present invention, λ max1 -λ max2 ≤ 20 nm.

[0277] According to an embodiment of the present invention, λ max2 -λ max1 ≤ 40 nm.

[0278] According to an embodiment of the present invention, the λ max2 -λ max1 ≤ 30 nm.

[0279] According to an embodiment of the present invention, the λ max2 -λ max1 ≥ 10 nm.

[0280] According to an embodiment of the present invention, 10 nm ≤ λ max2 -λ max1 ≤ 30 nm.

[0281] According to an embodiment of the present invention, 0 nm < λ max1 -λ max2 ≤ 20 nm.

[0282] According to an embodiment of the present invention, 0 nm < λ max1 -λ max2 ≤ 10 nm.

[0283] According to an embodiment of the present invention, the weight of the fluorescent luminescent material in the light-emitting layer of the organic electroluminescent device accounts for 0.01% - 5% of the total weight of the light-emitting layer.

[0284] According to an embodiment of the present invention, the weight of the fluorescent luminescent material in the light-emitting layer of the organic electroluminescent device accounts for 0.05% - 3% of the total weight of the light-emitting layer.

[0285] According to an embodiment of the present invention, in the light-emitting layer of the organic electroluminescent device, the weight of the fluorescent light-emitting material accounts for 0.1%-1% of the total weight of the light-emitting layer.

[0286] According to an embodiment of the present invention, in the organic electroluminescent device, the full width at half maximum FWHM2 of the fluorescent light-emitting material ≤ 60 nm.

[0287] According to an embodiment of the present invention, in the organic electroluminescent device, the full width at half maximum FWHM2 of the fluorescent light-emitting material ≤ 50 nm.

[0288] According to an embodiment of the present invention, in the organic electroluminescent device, the full width at half maximum FWHM2 of the fluorescent light-emitting material ≤ 40 nm.

[0289] According to an embodiment of the present invention, the triplet energy level of the metal complex is T 1(Emt1) , and the triplet energy level of the fluorescent light-emitting material is T 1(Emt2) , where T 1(Emt1) > T 1(Emt2) .

[0290] According to an embodiment of the present invention, the triplet energy level of the first host compound is T 1(host1) , where T1(h ost1 ) > T1(E mt 1), T1(h ost1 ) > T1(E mt 2).

[0291] According to an embodiment of the present invention, the triplet energy level of the first host compound is T 1(host1) , where T1(h ost1 ) > T1(E mt 1).

[0292] In this embodiment, "T 1(host1) > T 1(Emt1) " means that the triplet energy level of the first host compound is higher than the triplet energy level of the metal complex.

[0293] According to an embodiment of the present invention, where T 1(host1) > T 1(Emt1) > T 1(Emt2) .

[0294] According to an embodiment of the present invention, the organic layer further comprises a second host compound, and the triplet energy level of the second host compound is T 1(host2) , T 1(host2) > T 1(Emt1) , T1(host2) > T 1(Emt2) 。

[0295] According to an embodiment of the present invention, wherein, T 1(host2) > T 1(Emt1) > T 1(Emt2) 。

[0296] According to an embodiment of the present invention, wherein, T 1(host1) > T 1(host2) > T 1(Emt1) > T 1(Emt2) 。

[0297] According to an embodiment of the present invention, wherein the organic electroluminescent device uses a fluorescent light-emitting material as the main light source.

[0298] According to an embodiment of the present invention, wherein the fluorescent light-emitting material is the terminal light-emitting material of the electroluminescent device.

[0299] According to an embodiment of the present invention, wherein the fluorescent light-emitting material is a delayed fluorescence material.

[0300] According to an embodiment of the present invention, wherein the fluorescent light-emitting material is a thermally activated delayed fluorescence (TADF) material.

[0301] According to an embodiment of the present invention, wherein the fluorescent light-emitting material is one material or multiple different materials.

[0302] According to an embodiment of the present invention, wherein the organic electroluminescent device emits fluorescence.

[0303] According to an embodiment of the present invention, wherein the organic electroluminescent device emits delayed fluorescence.

[0304] According to an embodiment of the present invention, wherein the organic layer is a light-emitting layer.

[0305] According to an embodiment of the present invention, wherein the light-emitting layer does not contain a polymer.

[0306] According to an embodiment of the present invention, during the preparation of the electroluminescent device of the present invention, post-polymerization does not occur.

[0307] According to another embodiment of the present invention, wherein the first host compound has a structure represented by Formula X-1 or Formula X-2:

[0308]

[0309] Wherein,

[0310] L xEach occurrence is the same as or different from each other and is independently selected from a single bond, a substituted or unsubstituted alkylene having 1-20 carbon atoms, a substituted or unsubstituted cycloalkylene having 3-20 carbon atoms, a substituted or unsubstituted arylene having 6-20 carbon atoms, a substituted or unsubstituted heteroarylene having 3-20 carbon atoms, or a combination thereof;

[0311] Each occurrence of G is the same as or different from each other and is independently selected from C(R g )2, NR g , O or S;

[0312] Each occurrence of V is the same as or different from each other and is independently selected from C, CR v or N;

[0313] In formula X-1, each occurrence of T is the same as or different from each other and is independently selected from C, CR T or N;

[0314] In formula X-2, each occurrence of T is the same as or different from each other and is independently selected from CR T or N;

[0315] R g , R v and R T Each occurrence is the same as or different from each other and is independently selected from the group consisting of: hydrogen, deuterium, halogen, a substituted or unsubstituted alkyl having 1-20 carbon atoms, a substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, a substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, a substituted or unsubstituted heterocyclic group having 3-20 ring atoms, a substituted or unsubstituted aralkyl having 7-30 carbon atoms, a substituted or unsubstituted alkoxy having 1-20 carbon atoms, a substituted or unsubstituted aryloxy having 6-30 carbon atoms, a substituted or unsubstituted alkenyl having 2-20 carbon atoms, a substituted or unsubstituted alkynyl having 2-20 carbon atoms, a substituted or unsubstituted aryl having 6-30 carbon atoms, a substituted or unsubstituted heteroaryl having 3-30 carbon atoms, a substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, a substituted or unsubstituted arylsilyl having 6-20 carbon atoms, a substituted or unsubstituted alkylgermyl having 3-20 carbon atoms, a substituted or unsubstituted arylgermyl having 6-20 carbon atoms, a substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0316] Each occurrence of Ar1 is the same as or different from each other and is independently selected from a substituted or unsubstituted aryl having 6-30 carbon atoms, a substituted or unsubstituted heteroaryl having 3-30 carbon atoms, or a combination thereof;

[0317] Adjacent substituents Rg ,R v and R T may optionally be connected to form a ring.

[0318] In this embodiment, "adjacent substituents R g ,R v and R T may optionally be connected to form a ring" is intended to mean that among adjacent substituent groups, for example, between two substituents R v , between two substituents R T , between two substituents R g , between substituent R v and R T , between substituent R v and R g , between substituent R g and R T x , any one or more of these substituent groups may be connected to form a ring. Obviously, these substituents may also not be connected to form a ring.

[0319] According to an embodiment of the present invention, wherein the first host compound has a structure represented by one of Formula X-a to Formula X-p:

[0320]

[0321]

[0322] Wherein,

[0323] L x is the same or different each time it appears and is selected from a single bond, a substituted or unsubstituted alkylene having 1-20 carbon atoms, a substituted or unsubstituted cycloalkylene having 3-20 carbon atoms, a substituted or unsubstituted arylene having 6-20 carbon atoms, a substituted or unsubstituted heteroarylene having 3-20 carbon atoms, or a combination thereof;

[0324] G is the same or different each time it appears and is selected from C(R g )2, NR g , O or S;

[0325] V is the same or different each time it appears and is selected from CR v or N;

[0326] T is the same or different each time it appears and is selected from CR T or N;

[0327] R g ,R v and R TEach occurrence is the same as or different from and is selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclic group having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted alkynyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermyl having 3-20 carbon atoms, substituted or unsubstituted arylgermyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0328] Ar1 is the same as or different from and is selected from substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, or combinations thereof each occurrence;

[0329] Adjacent substituents R g , R v and R T can optionally be linked to form a ring.

[0330] According to one embodiment of the present invention, wherein the first host compound is selected from the group consisting of the following compounds:

[0331]

[0332]

[0333]

[0334]

[0335]

[0336] According to one embodiment of the present invention, wherein the second host compound has a structure represented by formula Y:

[0337]

[0338] Wherein,

[0339] Each occurrence of H1 - H6 is independently selected from C, CR h or N, and at least two of H1 - H6 are N, at least one of H1 - H6 is C, and is connected to formula A;

[0340]

[0341] wherein,

[0342] Each occurrence of Q is independently selected from the group consisting of O, S, Se, N, NR Q , CR Q R Q , SiR Q R Q , GeR Q R Q and R Q C═CR Q ; when two Rs Q are present simultaneously, the two Rs Q can be the same or different;

[0343] p is 0 or 1; r is 0 or 1;

[0344] When Q is selected from N, p is 0 and r is 1;

[0345] When Q is selected from the group consisting of O, S, Se, NR Q , CR Q R Q , SiR Q R Q , GeR Q R Q and R Q C═CR Q ; p is 1 and r is 0;

[0346] L Q Each occurrence is independently selected from a single bond, a substituted or unsubstituted alkylene having 1 - 20 carbon atoms, a substituted or unsubstituted cycloalkylene having 3 - 20 carbon atoms, a substituted or unsubstituted arylene having 6 - 20 carbon atoms, a substituted or unsubstituted heteroarylene having 3 - 20 carbon atoms, or a combination thereof;

[0347] Each occurrence of Q1 - Q8 is independently selected from C, CR q or N;

[0348] R h , R Q and R qEach occurrence is the same as or different from each other and is selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-20 carbon atoms, substituted or unsubstituted heterocyclic group having 3-20 ring atoms, substituted or unsubstituted aralkyl having 7-30 carbon atoms, substituted or unsubstituted alkoxy having 1-20 carbon atoms, substituted or unsubstituted aryloxy having 6-30 carbon atoms, substituted or unsubstituted alkenyl having 2-20 carbon atoms, substituted or unsubstituted alkynyl having 2-20 carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermyl having 3-20 carbon atoms, substituted or unsubstituted arylgermyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxyl, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof;

[0349] "*" represents the connecting position of formula A and formula Y;

[0350] Adjacent substituents R h , R Q , R q can optionally be connected to form a ring.

[0351] As used herein, "adjacent substituents R h , R Q , R q can optionally be connected to form a ring" is intended to mean that among adjacent substituent groups, for example, between two substituents R h , between two substituents R Q , between two substituents R q , between two substituents R Q and R q , any one or more of these substituent groups can be connected to form a ring. Obviously, these substituents may also not be connected to form a ring at all.

[0352] According to one embodiment of the present invention, wherein the second host compound is selected from the group consisting of the following compounds:

[0353]

[0354]

[0355]

[0356]

[0357]

[0358]

[0359]

[0360]

[0361]

[0362] According to another embodiment of the present invention, a display device is also disclosed, which includes the organic electroluminescent device as described in any of the foregoing embodiments.

[0363] According to another embodiment of the present invention, the application of the organic electroluminescent device as described in any of the foregoing embodiments in a display device is also disclosed.

[0364] Combined with other materials

[0365] The materials for the specific layers in the organic light-emitting devices described in the present invention can be used in combination with various other materials present in the devices. The combinations of these materials are described in detail in paragraphs 0132 - 0161 of US Patent Application US2016 / 0359122A1, the entire content of which is 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.

[0366] The materials described herein as being useful for specific layers in organic light-emitting devices can be used in combination with a variety of other materials present in the devices. For example, the compounds disclosed herein can be used in combination with a variety of hosts, transport layers, blocking layers, injection layers, electrodes, and other layers that may be present. The combinations of these materials are described in detail in paragraphs 0080 - 0101 of US Patent Application US2015 / 0349273A1, the entire content of which is 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.

[0367] The metal complexes and fluorescent luminescent materials used in the present invention can be easily obtained by referring to the preparation methods in the prior art. For example, some metal complexes can be prepared by referring to documents such as US20200091442A1 and US20200251666A1, and the fluorescent luminescent materials can be prepared by referring to documents such as Angew.Chem.Int.Ed.2023,62,e202304104 (DOI: 10.1002 / anie.202304104). The preparation methods thereof will not be elaborated herein. The documents listed above are only exemplary, and those skilled in the art can easily obtain other documents.

[0368] Examples of material synthesis:

[0369] There is no limitation on the preparation method of the metal complex of the present invention. Typically but not restrictively, the following compounds are taken as examples, and their synthetic routes and preparation methods are as follows:

[0370] Synthesis Example 1: Synthesis of metal complex M-b26

[0371] Step 1: Synthesis of intermediate 3:

[0372]

[0373] Under nitrogen conditions, intermediate 1 (4.7 g, 16.9 mmol), intermediate 2 (5.5 g, 18.6 mmol), Pd(PPh3)4 (0.78 g, 0.67 mmol) and potassium carbonate (3.5 g, 25.3 mmol) were dissolved in 1,4-dioxane (90 mL) and water (30 mL). The reaction was heated to reflux and reacted overnight. After the reaction was complete, it was extracted with ethyl acetate (EA) and water. The organic layer was washed twice with an aqueous sodium chloride solution, dried over anhydrous magnesium sulfate, and evaporated to dryness under reduced pressure. Intermediate 3 (6.2 g, 15.1 mmol) was obtained by column chromatography.

[0374] Step 2: Synthesis of intermediate 4:

[0375]

[0376] Under nitrogen atmosphere, intermediate 3 (3.0 g, 7.3 mmol), bis(pinacolato)diboron (2.1 g, 8.1 mmol), Pd(OAc)2 (0.05 g, 0.22 mmol), 2-dicyclohexylphosphino-2',4',6'-triisopropylbiphenyl (Xphos, 0.21 g, 0.44 mmol) and potassium acetate (1.08 g, 11.0 mmol) were dissolved in 1,4-dioxane (90 mL). The reaction was heated to reflux overnight. After completion of the reaction, it was extracted with EA and water. The organic layer was washed twice with aqueous sodium chloride solution, dried over anhydrous magnesium sulfate and evaporated under reduced pressure to obtain intermediate 4 (3.5 g, 7.0 mmol).

[0377] Step 3: Synthesis of intermediate 6:

[0378]

[0379] Under nitrogen atmosphere, intermediate 4 (3.5 g, 7.0 mmol), intermediate 5 (4.5 g, 8.0 mmol), Pd(OAc)2 (0.05 g, 0.22 mmol), 2-dicyclohexylphosphino-2',6'-dimethoxybiphenyl (Sphos, 0.19 g, 0.44 mmol) and potassium carbonate (1.52 g, 11.0 mmol) were dissolved in 1,4-dioxane (90 mL) and water (30 mL). The reaction was heated to reflux overnight. After completion of the reaction, it was extracted with EA and water. The organic layer was washed twice with aqueous sodium chloride solution, dried over anhydrous magnesium sulfate and evaporated under reduced pressure. It was purified by column chromatography to obtain intermediate 6 (5.2 g, 5.7 mmol).

[0380] Step 4: Synthesis of metal complex M-b26:

[0381]

[0382] In a dried 250 mL round-bottom flask, intermediate 6 (2.98 g, 3.3 mmol), potassium chloroplatinate (1.24 g, 3.0 mmol) and acetic acid (50 mL) were added successively. Under nitrogen protection, it was heated to reflux for 48 h. After the reaction cooled down, water was added and filtered. The filter cake was washed twice with methanol and n-hexane respectively. Then the filter cake was dissolved in dichloromethane, the organic phase was collected, concentrated under reduced pressure and purified by column chromatography to obtain yellow solid metal complex M-b26 (1.68 g, 51.0% yield). The structure of this product was determined to be the target product with a molecular weight of 1097.4.

[0383] Those skilled in the art should be aware that the above preparation method is only an exemplary example, and those skilled in the art can obtain other metal complex structures of the present invention by improving it.

[0384] The preparation method of the electroluminescent device is not limited. The preparation methods in the following examples are only examples and should not be construed as limitations. Those skilled in the art can reasonably improve the preparation methods in the following examples based on the prior art. Exemplarily, the ratios of various materials in the light-emitting layer are not particularly limited, and those skilled in the art can reasonably select within a certain range according to the prior art. For example, based on the total weight of the light-emitting layer materials, the host material can account for 75%-98%, the metal complex can account for 1%-20%, and the fluorescent light-emitting material can account for 1%-5%; or the host material can account for 88%-98%, the metal complex can account for 1%-10%, and the fluorescent light-emitting material can account for 1%-2%. In addition, the host material can be two materials, and the ratio of the two host materials to the host material can be 99:1 to 1:99; or, the ratio can be 80:20 to 20:80; or, the ratio can be 70:30 to 30:70. In the examples of the device, the characteristics of the device are also tested using conventional equipment in the art (including but not limited to the evaporation machine produced by Angstrom Engineering, the optical test system and life test system produced by Suzhou FushiDa, the ellipsometer produced by Beijing Liangtuo, etc.) by methods well-known to those skilled in the art.

[0385] In the present invention, the method for testing the triplet energy level of the compound is as follows:

[0386] Method for testing the triplet energy level of the metal complex:

[0387] The photoluminescence spectrum (PL) data of the compound to be tested was measured using a fluorescence spectrophotometer of model F98 produced by Shanghai Lengguang Technology Co., Ltd. The metal complex was dissolved in toluene solvent to prepare a 10 -5 M concentration solution. Nitrogen was passed through the prepared solution to remove oxygen for 5 minutes. The above solution was loaded into a quartz sample and excited with light of 400 nm wavelength at room temperature (298K) to measure its photoluminescence spectrum (PL).

[0388] The vertical axis of the PL spectrum is the phosphorescence intensity, and the horizontal axis is the wavelength. After taking the minimum value λ1 (nm) for the peak on the short-wavelength side of the phosphorescent PL spectrum, this wavelength value is substituted into the following conversion formula F1 to calculate the triplet energy level (or triplet energy).

[0389] Conversion formula F1: T1 (eV) = 1240 / λ1

[0390] Method for testing the triplet energy level of the host compound:

[0391] The photoluminescence spectrum (PL) data of the compound to be measured was determined using a fluorescence spectrophotometer of model F98 produced by Shanghai Lengguang Technology Co., Ltd. The compound was dissolved in 2-methyltetrahydrofuran solvent to prepare a 10 -5 M concentration solution. Nitrogen was bubbled through the prepared solution for 5 minutes to remove oxygen. After loading the above solution into a quartz sample tube, it was placed in a Dewar flask and cooled to 77K. It was excited with light of 330nm wavelength and its photoluminescence spectrum (PL) was measured.

[0392] The vertical axis of the PL spectrum is the phosphorescence intensity and the horizontal axis is the wavelength. After taking the minimum value λ2 (nm) of the peak on the short wavelength side of the phosphorescence PL spectrum, this wavelength value was substituted into the following conversion formula F2 to calculate the triplet energy level.

[0393] Conversion formula F2: T2 (eV) = 1240 / λ2

[0394] The triplet energy level of the fluorescent luminescent material can be obtained by referring to the existing technical methods or the testing method of the above-mentioned main compound.

[0395] The triplet energy levels T1 (eV) of the following compounds were determined by the above method, and the specific results are shown in Table 1.

[0396] Table 1 Triplet energy level data of compounds

[0397]

[0398]

[0399] The relationship between the triplet energy levels of the host material and the metal complex in the light-emitting layer of the organic electroluminescent device has a crucial impact on the performance of the device. It was found that when the triplet energy level of the metal complex is higher than that of the host compound, energy easily back-transfers from the triplet energy level of the metal complex to the triplet energy level of the host compound, resulting in exciton quenching and thus reducing the luminescence efficiency of the device. In the device of the present invention, the triplet energy level of the host compound is higher than that of the metal complex, which can better transfer energy from the host compound to the metal complex, improve the energy transfer efficiency, lay a good foundation for the subsequent energy transfer from the metal complex to the fluorescent luminescent material, and better promote the energy transfer in the light-emitting layer, thereby obtaining a high-performance organic electroluminescent device.

[0400] Device embodiments

[0401] Device embodiment 1

[0402] First, clean the glass substrate, which has an indium tin oxide (ITO) anode with a thickness of 80 nm, and then treat it with oxygen plasma and UV ozone. After treatment, dry the substrate in a glove box to remove moisture. Then mount the substrate on a substrate holder and load it into a vacuum chamber. The organic layers specified below are deposited sequentially on the ITO anode by thermal vacuum evaporation at a rate of 0.2 - 2 Å / s under a vacuum of about 10 -8 Torr. Compounds HT and HT1 are co-deposited and used as the hole injection layer (HIL, weight ratio 97:3). Compound HT is used as the hole transport layer (HTL). Compound PH-23 is used as the electron blocking layer (EBL). Then the first host compound PH-1, the second host compound H-40, the metal complex M-a43, and the fluorescent luminescent material BD-26 are co-deposited and used as the emitting layer (EML, weight ratio 56:37:6:1). On the EML, compound HB is used as the hole blocking layer (HBL). On the HBL, compounds ET and lithium 8-hydroxyquinolate (Liq) are co-deposited as the electron transport layer (ETL, weight ratio 40:60). Finally, deposit 1 nm thickness of lithium 8-hydroxyquinolate (Liq) as the electron injection layer, and deposit 120 nm of aluminum as the cathode. Then transfer the device back to the glove box and encapsulate it with a glass cover and a desiccant to complete the device.

[0403] Device Example 2

[0404] The implementation of Device Example 2 is the same as that of Device Example 1, except that the metal complex M-a48 is used to replace the metal complex M-a43 in the emitting layer (EML).

[0405] Device Example 3

[0406] The implementation of Device Example 3 is the same as that of Device Example 1, except that the metal complex M-a41 is used to replace the metal complex M-a43 in the emitting layer (EML).

[0407] Device Example 4

[0408] The implementation of Device Example 4 is the same as that of Device Example 1, except that the metal complex M-a12 is used to replace the metal complex M-a43 in the emitting layer (EML).

[0409] Device Example 5

[0410] The implementation of Device Example 5 is the same as that of Device Example 1, except that the metal complex M-a30 is used to replace the metal complex M-a43 in the emitting layer (EML), and the weight ratio of the first host compound PH-1, the second host compound H-40, the metal complex M-a30 of the present invention, and the fluorescent luminescent material BD-26 is 46.5:46.5:6:1.

[0411] Device Example 8

[0412] The implementation of Device Example 8 is the same as that of Device Example 1, except that the metal complex M-a85 is used to replace the metal complex M-a43 in the emitting layer (EML), and the weight ratio of the first host compound PH-1, the second host compound H-40, the metal complex M-a85 of the present invention, and the fluorescent emitting material BD-26 is 56:37:6:1.

[0413] Device Example 9

[0414] The implementation of Device Example 9 is the same as that of Device Example 1, except that the metal complex M-a84 is used to replace the metal complex M-a43 in the emitting layer (EML), PH-51 is used to replace the first host compound PH-1, H-109 is used to replace the second host compound H-40, and the fluorescent emitting material BD-124 is used to replace the fluorescent emitting material BD-26; and the weight ratio of PH-51, H-109, the metal complex M-a84, and the fluorescent emitting material BD-124 is 60:33:6:1.

[0415] Device Example 10

[0416] The implementation of Device Example 10 is the same as that of Device Example 9, except that the fluorescent emitting material BD-80 is used to replace the fluorescent emitting material BD-124 in the emitting layer (EML).

[0417] Device Comparative Example 1

[0418] The implementation of Device Comparative Example 1 is the same as that of Device Example 1, except that the metal complex GD1 is used to replace the metal complex M-a43 in the emitting layer (EML).

[0419] Device Comparative Example 2

[0420] The implementation of Device Comparative Example 2 is the same as that of Device Example 1, except that the first host compound PH-1, the second host compound H-40, and the fluorescent emitting material BD-26 are co-evaporated to form the emitting layer (EML) in the emitting layer (EML), and the weight ratio is 59:40:1.

[0421] Device Comparative Example 3

[0422] The implementation of Device Comparative Example 3 is the same as that of Device Example 1, except that the first host compound PH-1, the second host compound H-40, and the metal complex M-a43 of the present invention are co-evaporated to form the emitting layer (EML) in the emitting layer (EML), and the weight ratio is 56:38:6.

[0423] Device Comparative Example 4

[0424] The implementation of Device Comparative Example 4 is the same as that of Device Example 2, except that in the emitting layer (EML), the first host compound PH-1, the second host compound H-40, and the metal complex M-a48 of the present invention are co-evaporated to form the emitting layer (EML), and the weight ratio is 56:38:6.

[0425] Device Comparative Example 5

[0426] The implementation of Device Comparative Example 5 is the same as that of Device Example 3, except that in the emitting layer (EML), the first host compound PH-1, the second host compound H-40, and the metal complex M-a41 of the present invention are co-evaporated to form the emitting layer (EML), and the weight ratio is 56:38:6.

[0427] Device Comparative Example 6

[0428] The implementation of Device Comparative Example 6 is the same as that of Device Example 4, except that in the emitting layer (EML), the first host compound PH-1, the second host compound H-40, and the metal complex M-a12 of the present invention are co-evaporated to form the emitting layer (EML), and the weight ratio is 56:38:6.

[0429] Device Comparative Example 7

[0430] The implementation of Device Comparative Example 7 is the same as that of Device Example 5, except that in the emitting layer (EML), the first host compound PH-1, the second host compound H-40, and the metal complex M-a30 of the present invention are co-evaporated to form the emitting layer (EML), and the weight ratio is 47:47:6.

[0431] Device Comparative Example 11

[0432] The implementation of Device Comparative Example 11 is the same as that of Device Example 8, except that in the emitting layer (EML), the first host compound PH-1, the second host compound H-40, and the metal complex M-a85 of the present invention are co-evaporated to form the emitting layer (EML), and the weight ratio is 56.4:37.6:6.

[0433] Device Comparative Example 12

[0434] The implementation of Device Comparative Example 12 is the same as that of Device Example 9, except that in the emitting layer (EML), the first host compound PH-51, the second host compound H-109, and the fluorescent emitting material BD-124 are co-evaporated to form the emitting layer (EML), and the weight ratio is 59.5:39.5:1

[0435] Device Comparative Example 13

[0436] The implementation of Device Comparative Example 13 is the same as that of Device Example 9, except that in the emitting layer (EML), the first host compound PH-51, the second host compound H-109, and the metal complex M-a84 of the present invention are co-evaporated to form the emitting layer (EML), and the weight ratio is 61:33:6.

[0437] Device Comparative Example 14

[0438] The implementation of Device Comparative Example 14 is the same as that of Device Example 9, except that in the emitting layer (EML), the first host compound PH-51, the second host compound H-109, and the fluorescent emitting material BD-80 are co-evaporated to form the emitting layer (EML), and the weight ratio is 64.5:34.5:1.

[0439] The detailed device layer structures and thicknesses are shown in Table 2 below. For the layers in which more than one material is used, the different compounds are doped in the recorded weight ratios.

[0440] Table 2 Partial device structures of Examples 1-5, 8 and Comparative Examples 1-7, 11

[0441]

[0442]

[0443] The material structures used in the device are as follows:

[0444]

[0445]

[0446] The CIE data of the device were measured at a constant brightness of 1000 cd / cm 2 , the maximum emission wavelength (λ max ), the full width at half maximum (FWHM), the driving voltage (V), the power efficiency (PE), and the lifetime LT97 of the device were measured at the initial brightness of 10000 cd / cm 2 . These data were recorded and shown in Table 3.

[0447] Table 3 Device data of Examples 1-5, 8 and Comparative Examples 1-7, 11

[0448]

[0449] The differences between Examples 1 to 4, Example 8 and Comparative Example 1 are only that: the structures of the metal complexes used in the device emitting layer are different. From the data in Table 3, it can be seen that compared with Comparative Example 1, the present invention adopts a specific L in the emitting layer aThe metal complexes of the ligands as phosphorescent sensitizers in Device Examples 1 to 4 and Example 8 of the fluorescent luminescent material BD-26 exhibit more excellent comprehensive performance: for example, the driving voltages are reduced by 0.84V, 0.63V, 0.43V, 0.13V and 0.66V respectively; the PEs are increased by 38.9%, 29.0%, 21.0%, 2.8% and 31.5% respectively. In addition, in terms of lifespan, it can be seen that Comparative Example 1 already has a relatively high lifespan level, while Examples 3 and 8 of the present invention maintain a long lifespan basically equivalent to that of Comparative Example 1. For Examples 1, 2 and 4, on this basis, an unexpectedly large increase is still achieved, with increases of 75.7%, 28.9% and 17% respectively.

[0450] The above data indicate that compared with the devices that do not use the metal complex of the specific L a ligand as a phosphorescent sensitizer of the present invention, the devices of the present invention that use the metal complex of the specific L a ligand as a sensitizer to sensitize the fluorescent luminescent material with a specific Formula 1-1 structure have more excellent comprehensive performance, can not only reduce the driving voltage, but also improve the PE and / or the device lifespan.

[0451] The differences between Examples 1 to 4 and Example 8 and Comparative Example 2 are only as follows: Examples 1 to 4 and Example 8 use the metal complex of the L a ligand represented by Formula 1 as a phosphorescent sensitizer, while Comparative Example 2 does not use a phosphorescent sensitizer. From the data in Table 3, it can be seen that the emission spectra of Examples 1 to 4 and Example 8 are basically the same as those of Comparative Example 2, and the full width at half maximum is very narrow, indicating that the devices of Examples 1 to 4 and Example 8 also achieve fluorescence emission. However, compared with Comparative Example 2 of the ordinary fluorescent device, the sensitized fluorescent devices of the present invention have significantly improved PEs and lifespans. Specifically: the PEs are increased by 70.4%, 58.2%, 48.3%, 26.0% and 61.3% respectively, and the lifespans are increased by 46.2 times, 33.7 times, 25.1 times, 30.5 times and 27.5 times respectively.

[0452] The difference between Example 9 and Comparative Example 12, and Example 10 and Comparative Example 14 is also only as follows: the Examples use the L aThe metal complex of the ligand serves as a phosphorus photosensitizer, while the comparative examples do not use a phosphorus photosensitizer. It can be seen from the data in Table 3 that the emission spectra of Example 9 compared with Comparative Example 12 and Example 10 compared with Comparative Example 14 are basically the same, and the full width at half maximum is very narrow, indicating that the devices of Example 9 and 10 also achieve fluorescence emission. However, compared with Comparative Examples 12 and 14 of ordinary fluorescent devices, the sensitized fluorescent devices of the present invention have significantly improved PE and lifetime. Specifically: compared with Comparative Example 12, the PE of Example 9 increased by 30.2%, and the lifetime increased by approximately 27 times; compared with Comparative Example 14, the PE of Example 10 increased by 32.1%, and the lifetime increased by approximately 29.6 times. The above data show that compared with ordinary fluorescent devices that do not use phosphorus photosensitizers in the light-emitting layer, the sensitized fluorescent devices of the present invention have very excellent performance, not only can maintain a narrow full width at half maximum of the spectrum, but also can significantly improve the PE and lifetime of the devices. In particular, the lifetime is increased by more than 25 times, well compensating for the deficiencies of ordinary fluorescent devices.

[0453] When Examples 1 to 5, Examples 8 to 10 are compared with Comparative Examples 3 to 7, Comparative Example 11, and Comparative Example 13 respectively, the difference is only that in Examples 1 to 5 and Examples 8 to 10, the metal complex of the present invention and a fluorescent light-emitting material are used simultaneously, and the device emits fluorescence; while in Comparative Examples 3 to 7, Comparative Example 11, and Comparative Example 13, only the corresponding metal complex is used without using a fluorescent light-emitting material, and the device emits phosphorescence. Compared with Comparative Example 3 for Example 1, Comparative Example 4 for Example 2, Comparative Example 5 for Example 3, Comparative Example 6 for Example 4, Comparative Example 7 for Example 5, Comparative Example 11 for Example 8, and Comparative Example 13 for Examples 9 - 10, the sensitized fluorescent light-emitting devices of Examples 1 to 5 and Examples 8 to 10 of the present invention show unexpectedly excellent performance in all aspects, such as having a lower driving voltage, a higher PE, a longer lifetime, and / or a narrower full width at half maximum. The above data show that the sensitized fluorescent devices of the present invention also have more excellent device performance compared with ordinary phosphorescent devices.

[0454] Device Example 6

[0455] The implementation manner of Device Example 6 is the same as that of Device Example 1, except that the metal complex M-b26 is used to replace the metal complex M-a43 in the light-emitting layer (EML), and the weight ratio of the first host compound PH-1, the second host compound H-40, the metal complex M-b26, and the fluorescent light-emitting material BD-26 is 45.5:45.5:8:1.

[0456] Device Example 7

[0457] The implementation of Device Example 7 is the same as that of Device Example 6, except that the metal complex M-b1 is used to replace the metal complex M-b26 in the emitting layer (EML), and the weight ratio of the first host compound PH-1, the second host compound H-40, the metal complex M-b1, and the fluorescent emitting material BD-26 is 55:36:8:1.

[0458] Device Comparative Example 8

[0459] The implementation of Device Comparative Example 8 is the same as that of Device Example 6, except that the first host compound PH-1, the second host compound H-40, and the fluorescent emitting material BD-26 are co-evaporated to form the emitting layer (EML) in the emitting layer (EML), and the weight ratio is 49.5:49.5:1.

[0460] Device Comparative Example 9

[0461] The implementation of Device Comparative Example 9 is the same as that of Device Example 6, except that the first host compound PH-1, the second host compound H-40, and the metal complex M-b26 of the present invention are co-evaporated to form the emitting layer (EML) in the emitting layer (EML), and the weight ratio is 46:46:8.

[0462] Device Comparative Example 10

[0463] The implementation of Device Comparative Example 10 is the same as that of Device Example 7, except that the first host compound PH-1, the second host compound H-40, and the fluorescent emitting material BD-26 are co-evaporated to form the emitting layer (EML) in the emitting layer (EML), and the weight ratio is 59:40:1.

[0464] The detailed device layer structure and thickness are shown in the following table. For the layers with more than one material used, they are doped with different compounds in the recorded weight ratios.

[0465] Table 4 Partial device structures of Examples 6-7 and Comparative Examples 8-10

[0466]

[0467] The material structures newly used in the device are as follows:

[0468]

[0469] The CIE data of the device was measured under a constant current of 15 mA / cm 2 , the maximum emission wavelength (λ max ), the full width at half maximum (FWHM), the driving voltage (V), the current efficiency (CE), the power efficiency (PE), the external quantum efficiency (EQE), at 10000 cd / cm 2The lifetime LT97 of the device was measured at the initial brightness, and these data were recorded and shown in Table 5.

[0470] Table 5 Device data of Examples 6-7 and Comparative Examples 8-10

[0471]

[0472] The difference between Example 6 and Comparative Example 8 is only that: in the light-emitting layer of Example 6, in addition to the fluorescent light-emitting material, the metal complex M-b26 containing a specific L a ligand of the present invention is further used as a phosphorescent sensitizer.

[0473] It can be seen from the data in Table 5 that the maximum emission wavelengths of Example 6 and Comparative Example 8 are almost the same, which indicates that the light emitted by the device of Example 6 comes from the fluorescent light-emitting material BD-26. However, compared with the ordinary fluorescent light-emitting device of Comparative Example 8, the device of Example 6 of the present invention can further achieve an unexpected significant improvement in device efficiency and lifetime while maintaining a narrow full width at half maximum and a low voltage comparable to those of Comparative Example 8. Specifically, the CE, PE, and EQE are respectively increased by 58.1%, 56.5%, and 57.9% significantly, and the lifetime is increased by 14.5 times.

[0474] The difference between Example 6 and Comparative Example 9 is only that: in Example 6, the metal complex of the present invention is used to sensitize the fluorescent light-emitting material with a specific structure of the present invention, and the device emits fluorescence, while in the light-emitting layer of Comparative Example 9, only the metal complex is used and no fluorescent light-emitting material is used, and the device emits phosphorescence. Compared with the phosphorescent device of Comparative Example 9, the performance of the sensitized fluorescent device of Example 6 unexpectedly shows more excellent effects in all aspects: having higher CE, PE, and EQE, a narrower full width at half maximum, and a lower voltage. In particular, the lifetime of the sensitized fluorescent device of Example 6 is 4.1 times that of the phosphorescent device of Comparative Example 9.

[0475] The difference between Example 7 and Comparative Example 10 is also only that: in the light-emitting layer of Example 7, in addition to the fluorescent light-emitting material, the metal complex M-b1 of the present invention is further used as a phosphorescent sensitizer.

[0476] Similarly, it can be seen from the device data in Table 5 that the maximum emission wavelengths of Example 7 and Comparative Example 10 are the same, indicating that the light emitted by the device in Example 7 also comes from the fluorescent light-emitting material. Compared with Comparative Example 10, Example 7 also further realizes a significant improvement in device efficiency and lifetime while maintaining a narrow full width at half maximum and a low voltage. Specifically, the CE, PE, and EQE are respectively increased by 80.9%, 82.7%, and 79.5% significantly, and the lifetime is increased by 19.4 times.

[0477] The above results show that, compared with both a general fluorescent light-emitting device that does not contain a phosphorus photosensitizer and a general phosphorescent light-emitting device that does not contain a fluorescent light-emitting material, the device of the present invention can efficiently sensitize the fluorescent light-emitting material having a specific Formula 1-1 structure by using a metal complex containing a ligand of a specific Formula 1 structure L in the light-emitting layer. It can not only maintain a low driving voltage level and a narrow full width at half maximum, but also significantly improve the device efficiency and lifespan, demonstrating unique advantages. a The ligand of the metal complex as a phosphorus photosensitizer can efficiently sensitize the fluorescent light-emitting material having a specific Formula 1-1 structure of the present invention, not only maintaining a low driving voltage level and a narrow full width at half maximum, but also achieving a significant improvement in device efficiency and lifespan, showing unique advantages.

[0478] In summary, the device of the present invention can efficiently sensitize the fluorescent light-emitting material having a specific Formula 1-1 structure of the present invention by using a metal complex containing a ligand of a specific Formula 1 structure L as a phosphorus photosensitizer in the light-emitting layer, enabling the device to exhibit excellent comprehensive performance. On the basis of maintaining a relatively low driving voltage and a relatively narrow full width at half maximum, it can further significantly improve the device efficiency and / or lifespan, having extremely high application prospects. a The ligand of the metal complex as a phosphorus photosensitizer can efficiently sensitize the fluorescent light-emitting material having a specific Formula 1-1 structure of the present invention, enabling the device to exhibit excellent comprehensive performance, and further significantly improving the device efficiency and / or lifespan on the basis of maintaining a relatively low driving voltage and a relatively narrow full width at half maximum, having extremely high application prospects.

[0479] 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 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 regarding why the present invention works are not intended to be restrictive.

Claims

1. An organic electroluminescent device, comprising: anode, cathode, and an organic layer disposed between the anode and the cathode, wherein The organic layer at least comprises a first host compound, a metal complex and a fluorescent light-emitting material; The triplet energy level of the first host compound is higher than the triplet energy level of the metal complex; The first host compound is a small molecule compound; The metal complex comprises a metal M and a ligand L coordinated with the metal M. a , the metal M is selected from metals with a relative atomic mass greater than 40, and the L a Having a structure represented by Formula 1: in, Ring A1 and Ring A2 are selected from an aromatic ring having 6 to 30 ring atoms, a heteroaromatic ring having 5 to 30 ring atoms, or a combination thereof; E1 and E2 are selected, identically or differently, from C or N at each occurrence; G1 and G2 are identically or differently selected at each occurrence from a single bond, O, S or NR'; L1 is selected from the group consisting of a single bond, BR", CR"R", NR", O, SiR"R", PR", S, GeR"R", Se, substituted or unsubstituted vinylene, ethynylene, substituted or unsubstituted arylene having 6 to 30 carbon atoms, substituted or unsubstituted heteroarylene having 3 to 30 carbon atoms, and combinations thereof at each occurrence; when two R" are present at the same time, the two R" are the same or different; R1 and R2, when they appear each time, are identical or different and represent mono-, poly- or non-substituted; R1, R2, R' and R" 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 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; When the metal M is selected from Ir, L1 is selected from a single bond, G1 and G2 are selected from a single bond, and one of the rings A1 and A2 is selected from a benzene ring and the other is selected from a pyridine ring, each occurrence of R1 and R2 is the same or different and represents a single substitution or a multiple substitution, and at least one of R1 and R2 is selected from: deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted alkyl having 6 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted alkynyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted alkylgermanyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylgermanyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof; Adjacent substituents R1, R2, R' and R" can optionally be linked to form a ring; The fluorescent light-emitting material has a structure represented by Formula 1-1: wherein Ring A, Ring B, Ring C, Ring D, and Ring E are identically or differently selected from unsaturated carbocyclic rings having 5 to 30 carbon atoms, or unsaturated heterocyclic rings having 3 to 30 carbon atoms each time they occur; X1, X2 are selected from O, S, Se, BR E NR E , CR E R E 、SiR E R E ; When there are two R E When two R E Same or different; R ta ', R tb ', R tc ', R td ', R te ' and R E Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted cycloalkyl having 2 to 20 carbon atoms alkenyl, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3-20 carbon atoms, substituted or unsubstituted arylgermanyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, -BR t ”R t ”, and combinations thereof; R t " is selected, at each occurrence, identically or differently, from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted cycloalkyl having 2 to 20 carbon atoms alkenyl, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3-20 carbon atoms, substituted or unsubstituted arylgermanyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof; Adjacent substituent R ta ', R tb ', R tc ', R td ', R te ', R t ” and R E Can optionally be linked to form a ring.

2. The organic electroluminescent device according to claim 1, wherein: Ring A, Ring B, Ring C, Ring D and Ring E are identically or differently selected from a five-membered unsaturated carbocyclic ring, an aromatic ring having 6 to 30 carbon atoms, or a heteroaromatic ring having 3 to 30 carbon atoms at each occurrence; Preferably, each occurrence of Ring A, Ring B, Ring C, Ring D and Ring E is identically or differently 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; More preferably, each occurrence of Ring A, Ring B, Ring C, Ring D and Ring E is identically or differently selected from a benzene ring, a pyridine ring, a naphthalene ring, a phenanthrene ring, an anthracene ring, an indene ring, a fluorene ring, an indole ring, a carbazole ring, a benzofuran ring, a dibenzofuran ring, a benzosilole ring, a dibenzosilole ring, a benzothiophene ring, a dibenzothiophene ring, a dibenzoselenophene ring, a cyclopentadiene ring, a furan ring, a thiophene ring, a silole ring, or a combination thereof.

3. The organic electroluminescent device according to claim 1, wherein: X1 and X2 are selected from O, S, Se or NR E Preferably, X1, X2 are selected from O or NR at each occurrence, the same or different E .

4. The organic electroluminescent device according to claim 1, wherein: The fluorescent light-emitting material has a structure represented by Formula 2-1, Formula 2-2, Formula 2-3, Formula 2-4, Formula 2-5 or Formula 2-6: R ta ', R tb ', R tc ', R td ', R te ', R te1 ' and R te2 'Each occurrence of the same or different means mono-, poly- or unsubstituted; R ta ', R tb ', R tc ', R td ', R te ', R te1 ' and R te2 ' is selected, at each occurrence, identically or differently, from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted cycloalkyl having 2 to 20 carbon atoms alkenyl, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3 to 20 carbon atoms, substituted or unsubstituted arylgermanyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, -BR t ”R t ”, and combinations thereof; R t " is selected, at each occurrence, identically or differently, from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted cycloalkyl having 2 to 20 carbon atoms alkenyl, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3-20 carbon atoms, substituted or unsubstituted arylgermanyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof; Adjacent substituent R ta ', R tb ', R tc ', R td ', R te ', R t ”, R te1 ', R te2 ' can be optionally linked to form a ring.

5. The organic electroluminescent device according to claim 4, wherein: R ta '、R tb '、R tc '、R td '、R te '、R t ”、R te1 '、R te2 ' each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl having 1-6 carbon atoms, substituted or unsubstituted cycloalkyl having 3-6 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-6 carbon atoms, substituted or unsubstituted aryl having 6-24 carbon atoms, substituted or unsubstituted heteroaryl having 3-12 carbon atoms, substituted or unsubstituted alkylsilyl having 3-6 carbon atoms, substituted or unsubstituted arylsilanyl having 6-12 carbon atoms, substituted or unsubstituted alkylgermanyl having 3-6 carbon atoms, substituted or unsubstituted arylgermanyl having 6-12 carbon atoms, substituted or unsubstituted amino having 0-12 carbon atoms, and combinations thereof; Preferably, R ta '、R tb '、R tc '、R td '、R te '、R t ”、R te1 '、R te2 ' is selected at each occurrence, the same or different, from the group consisting of hydrogen, deuterium, fluorine, cyano, hydroxyl, mercapto, methyl, ethyl, n-propyl, isopropyl, cyclopropyl, n-butyl, isobutyl, tert-butyl, cyclopentyl, neopentyl, cyclohexyl, trimethylsilyl, trimethylgermanyl, phenyl, biphenyl, terphenyl, quaterphenyl, triphenylene, tetraphenylene, naphthyl, phenanthrenyl, anthracenyl, indenyl, fluorenyl, indolyl, carbazolyl, benzofuranyl, dibenzofuranyl, benzothioyl, dibenzothioyl, benzothiophenyl, dibenzothiophenyl, dibenzoselenophene, diphenylamino, dibenzofuranylphenylamino, and combinations thereof.

6. The organic electroluminescent device according to claim 4, wherein: R ta '、R tb '、R tc '、R td '、R te '、R t ”、R te1 '、R te2 At least one of the following is selected, at each occurrence, identically or differently, from the group consisting of: deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted cycloalkyl having 2 to 20 carbon atoms substituted or unsubstituted alkenyl having 6-30 carbon atoms, substituted or unsubstituted aryl having 3-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl having 3-20 carbon atoms, substituted or unsubstituted arylsilyl having 6-20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3-20 carbon atoms, substituted or unsubstituted arylgermanyl having 6-20 carbon atoms, substituted or unsubstituted amino having 0-20 carbon atoms, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphino, and combinations thereof; Preferably, R ta '、R tb '、R tc '、R td '、R te '、R t ”、R te1 '、R te2 ' wherein at least one of the following is selected, at each occurrence, identically or differently, from the group consisting of: deuterium, halogen, cyano, hydroxyl, mercapto, substituted or unsubstituted alkyl having 1-6 carbon atoms, substituted or unsubstituted cycloalkyl having 3-6 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1-6 carbon atoms, substituted or unsubstituted aryl having 6-24 carbon atoms, substituted or unsubstituted heteroaryl having 3-12 carbon atoms, substituted or unsubstituted alkylsilyl having 3-6 carbon atoms, substituted or unsubstituted arylsilyl having 6-12 carbon atoms, substituted or unsubstituted alkylgermanyl having 3-6 carbon atoms, substituted or unsubstituted arylgermanyl having 6-12 carbon atoms, substituted or unsubstituted amino having 0-12 carbon atoms, and combinations thereof; More preferably, R ta '、R tb '、R tc '、R td '、R te '、R t ”、R te1 '、R te2 ', at least one of which each occurrence is identically or differently selected from the group consisting of: deuterium, fluorine, cyano, hydroxyl, mercapto, methyl, ethyl, n-propyl, isopropyl, cyclopropyl, n-butyl, isobutyl, tert-butyl, cyclopentyl, neopentyl, cyclohexyl, trimethylsilyl, trimethylgermanyl, phenyl, biphenyl, terphenyl, quaterphenyl, triphenylene, tetraphenylene, naphthyl, phenanthrenyl, anthracenyl, indenyl, fluorenyl, indolyl, carbazolyl, benzofuranyl, dibenzofuranyl, benzothioyl, dibenzothioyl, benzothiophenyl, dibenzothiophenyl, dibenzoselenophene, diphenylamino, dibenzofuranylphenylamino, and combinations thereof.

7. The organic electroluminescent device according to claim 1, wherein the fluorescent light-emitting material is selected from the group consisting of compound BD-1 to compound BD-215: -tBu represents tert-butyl; The hydrogen in Compound BD-1 to Compound BD-215 can be partially or completely substituted with deuterium.

8. The organic electroluminescent device according to claim 1, wherein: The metal complex has M(L a ) m (L b ) n (L c ) q The general formula, L a , L b and L c are the first ligand, the second ligand and the third ligand coordinated to the metal M, respectively, and L a and the L c or L b are the same or different; where L a , L b and L c can optionally be linked to form a multidentate ligand; The metal M is selected from metals with a relative atomic mass greater than 40; preferably, the metal M is selected from the group consisting of Cu, Ag, Au, Ru, Rh, Pd, Os, Ir and Pt; more preferably, the metal M is selected from Pt or Ir; m is selected from 1, 2 or 3, n is selected from 0, 1 or 2, q is selected from 0, 1 or 2, m+n+q is equal to the oxidation state of metal M; when m is greater than or equal to 2, multiple L a The same or different; when n is equal to 2, the two L b The same or different; when q is equal to 2, the two L c Same or different; L b and L c Each occurrence is identically or differently selected from any one of the following groups: in, X b Each occurrence is identically or differently selected from the group consisting of: O, S, Se, NR N1 , 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 and R b Each occurrence is identical or different and indicates mono-, poly-, or unsubstituted; R a , R b , R c , R N1 , R N2 , R C1 and R C2 The group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted an alkynyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted alkylgermanyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylgermanyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof; Adjacent substituent R a , R b , R c , R N1 , R N2 , R C1 and R C2 Can optionally be linked to form a ring.

9. The organic electroluminescent device according to claim 8, wherein: The metal complex has Ir(L a ) m (L b ) 3-m The general structure of and the structure represented by formula Ma: in, m is selected from 1, 2 or 3; when m is selected from 1, two L b The same or different; when m is selected from 2 or 3, multiple L a Same or different; Ring A1 is selected from heteroaromatic rings having 5 to 30 ring atoms; Ring A2 is selected from an aromatic ring having 6-30 ring atoms, a heteroaromatic ring having 5-30 ring atoms, or a combination thereof; U1 to U8 are selected from CR in the same or different way each time they appear. u or N; R1 and R2, when they appear each time, are identical or different and represent mono-, poly- or non-substituted; R1, R2 and R u The group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted an alkynyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted alkylgermanyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylgermanyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof; When ring A1 is selected from a pyridine ring, and ring A2 is selected from a benzene ring, and at least one of R1 and R2 is selected from the group consisting of: deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted alkynyl groups having 2-20 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 and R u Can optionally be linked to form a ring.

10. The organic electroluminescent device according to claim 1 or 9, wherein: Each occurrence of ring A1 is identically or differently selected from any of the following structures: Ring A2 is selected from any of the following structures at each occurrence, either identically or differently: in, Z is selected from the group consisting of O, S, Se, NR, CRR, SiRR and GeRR; R1, R2, when they appear each time, are identical or different, representing mono-substitution, poly-substitution, or no substitution; when there are multiple R1 or R2 in any structure, the R1 or R2 are identical or different; R1, R2 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 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 can be optionally linked to form a ring; Wherein, "#" indicates the position connected to metal Ir. indicates the position of connection with ring A1 or ring A2; Preferably, each occurrence of Ring A1 is identically or differently selected from Ring A2 is selected from 11. The organic electroluminescent device according to claim 8, wherein: The metal complex has Ir(L a ) m (L b ) 3-m The general structure of, and the structure represented by the formula Ma-0: in, m is selected from 1, 2 or 3; when m is selected from 1, two L b are the same or different; when m is selected from 2 or 3, 2 or 3 L a are the same or different; Z is selected from the group consisting of O, S, Se, NR, CRR, SiRR and GeRR; when there are multiple Rs, the multiple Rs are the same or different; X3 to X8 are selected identically or differently at each occurrence from CR'2 or N; Y'1 to Y'4 are selected identically or differently at each occurrence from CR'1 or N; R a and R b Each occurrence is identical or different and indicates mono-, poly-, or unsubstituted; R'1, R'2, R, R a , R b The group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted an alkynyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted alkylgermanyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylgermanyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof; Adjacent substituents R'1, R'2, R, R a , R b Can optionally be linked to form a ring.

12. The organic electroluminescent device according to claim 11, wherein: Z is selected from O, S, Se, NR or CRR; preferably, Z is selected from O or S.

13. The organic electroluminescent device according to claim 11, wherein: Y'1 to Y'4 are selected from CR'1 at each occurrence, the same or different, X3-X7 are selected from CR'2 at each occurrence, and X8 is selected from N or CR'2; R'1 and R'2 are 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, substituted or unsubstituted amino having 0-20 carbon atoms, cyano, hydroxyl, mercapto, and combinations thereof.

14. The organic electroluminescent device according to claim 11, wherein: At least one of X3-X8 is selected from CR'2, and R'2 is selected from cyano or fluorine; Preferably, X7 is selected from CR'2, wherein R'2 is selected from cyano or fluoro; or X8 is selected from CR'2, wherein R'2 is selected from cyano.

15. The organic electroluminescent device according to claim 1, wherein: The metal complex has a structure represented by the formula Mb: Ring A1 to Ring A4 are selected, at each occurrence, identically or differently, from an aromatic ring having 6 to 30 ring atoms, a heteroaromatic ring having 5 to 30 ring atoms, or a combination thereof; E1 to E4 are selected, at each occurrence, identically or differently, from C or N; G1 to G4 are selected, at each occurrence, identically or differently, from a single bond, O, S or NR'; L1 to L4 are selected from the group consisting of a single bond, BR", CR"R", NR", O, SiR"R", PR", S, GeR"R", Se, substituted or unsubstituted vinylene, ethynylene, substituted or unsubstituted arylene having 6 to 30 carbon atoms, substituted or unsubstituted heteroarylene having 3 to 30 carbon atoms, and combinations thereof at each occurrence; when two R"s are present at the same time, the two R"s are the same or different; a2 to a4 are selected from 0 or 1 the same or differently at each occurrence, and at least one of a2-a4 is selected from 1; R1 to R4, when they appear each time, are identical or different and represent mono-substitution, poly-substitution or no substitution; R1 to R4, R' and R" are each identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted 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; Adjacent substituents R1 to R4, R' and R" can be optionally linked to form a ring.

16. The organic electroluminescent device according to claim 1, wherein: The metal complex has a structure represented by formula Mb-1: in, Ring A1, Ring A 22 , Ring A3, Ring A4 are identically or differently selected at each occurrence from an aromatic ring having 6 to 30 ring atoms, a heteroaromatic ring having 5 to 30 ring atoms, or a combination thereof; Ring A 21 is selected from heteroaromatic rings having 5 ring atoms; E1 to E4 are selected, at each occurrence, identically or differently, from C or N; G1 is selected from O or S, the same or different at each occurrence; Y1, Y4, Y 11 is selected identically or differently at each occurrence from CR"', N, NR"', O or S; Y2, Y3, Y5 to Y 10 is selected identically or differently at each occurrence from C or N; R1 to R4, when they appear each time, are identical or different and represent mono-substitution, poly-substitution or no substitution; R1 to R4, R'' are each identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted substituted 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 to R4, R''' can be optionally linked to form a ring.

17. The organic electroluminescent device according to claim 16, wherein: G1 is selected from O; Ring A1, Ring A 22 , Ring A3, Ring A4 are each identically or differently selected from an aromatic ring having 6 to 18 ring atoms, a heteroaromatic ring having 5 to 18 ring atoms, or a combination thereof; Ring A 21 is selected, identically or differently on each occurrence, from a heteroaromatic ring having 5 ring atoms; Preferably, in formula Mb-1, ring A1, ring A 22 , Ring A3 is selected from a benzene ring, Ring A4 is selected from a pyridine ring, Ring A 21 Selected from imidazole rings.

18. The organic electroluminescent device according to claim 16, wherein: In formula Mb-1, Y2, Y3, Y5 to Y 10 Each occurrence is identically or differently selected from C; Y1, Y 11 each occurrence is identical or different selected from CR"'; Y4 is identical or different selected from NR"', O or S; said R"' is identical or different selected from the group consisting of hydrogen, deuterium, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, and combinations thereof; Preferably, Y4 is selected from NR"' at each occurrence, the same or different, and R"' is selected from substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, or a combination thereof.

19. The organic electroluminescent device according to claim 15 or 16, wherein: R1 to R4 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 alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3 to 20 carbon atoms, substituted or unsubstituted arylgermanyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, cyano, hydroxyl, mercapto, and combinations thereof; Preferably, at least one of R1, at least one of R2, at least one of R3, or at least one of R4, which are the same or different at each occurrence, are selected from 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, cyano, or a combination thereof.

20. The organic electroluminescent device according to claim 1, wherein: The metal complex is selected from the group consisting of M-a1 to M-a64, M-b1 to M-b62, and the specific structures of M-a1 to M-a64, M-b1 to M-b62 are as follows:

21. The organic electroluminescent device according to any one of claims 1 to 20, wherein: The triplet energy level of the first host compound is T 1(host1) , the triplet energy level of the metal complex is T 1(Emt1) The triplet energy level of the fluorescent material is T 1(Emt2) , where T 1(host1) >T 1(Emt1) , T 1(host1) >T 1(Emt2) Preferably, T 1(host1) >T 1(Emt1) >T 1(Emt2) .

22. The organic electroluminescent device according to any one of claims 1 to 21, wherein the organic layer is a light-emitting layer, and the first host compound has a structure represented by Formula X-1 or Formula X-2: in, L x is selected, at each occurrence, identically or differently, from a single bond, a substituted or unsubstituted alkylene group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkylene group having 3 to 20 carbon atoms, a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 20 carbon atoms, or a combination thereof; G is selected, identically or differently, from C(R g )2. NR g , O or S; Each occurrence of V is selected from C, CR v or N; In formula X-1, each occurrence of T is identical or different and is selected from C, CR T or N; In formula X-2, each occurrence of T is identically or differently selected from CR T or N; R g , R v and R T Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted Alkynyl groups having 2 to 20 carbon atoms, substituted or unsubstituted aryl groups having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6 to 20 carbon atoms, substituted or unsubstituted alkylgermanyl groups having 3 to 20 carbon atoms, substituted or unsubstituted arylgermanyl groups having 6 to 20 carbon atoms, substituted or unsubstituted amino groups having 0 to 20 carbon atoms, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof; Ar1 is selected, at each occurrence, identically or differently, from a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, or a combination thereof; Adjacent substituent R g , R v and R T can optionally be linked to form a ring; Preferably, the first host compound has a structure represented by one of Formula Xa to Formula Xp: in, L x is selected, at each occurrence, identically or differently, from a single bond, a substituted or unsubstituted alkylene group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkylene group having 3 to 20 carbon atoms, a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 20 carbon atoms, or a combination thereof; G is selected, identically or differently, from C(R g )2. NR g , O or S; Each time V appears, it is selected from CR in the same or different way. v or N; Each occurrence of T is selected from CR T or N; R g , R v and R T Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted Alkynyl groups having 2 to 20 carbon atoms, substituted or unsubstituted aryl groups having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6 to 20 carbon atoms, substituted or unsubstituted alkylgermanyl groups having 3 to 20 carbon atoms, substituted or unsubstituted arylgermanyl groups having 6 to 20 carbon atoms, substituted or unsubstituted amino groups having 0 to 20 carbon atoms, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof; Ar1 is selected, at each occurrence, identically or differently, from a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, or a combination thereof; Adjacent substituent R g , R v and R T Can optionally be linked to form a ring.

23. The organic electroluminescent device according to claim 22, wherein the light-emitting layer comprises a second host compound; preferably, the second host compound has a structure represented by formula Y: in, H1-H6 are selected from C, CR in the same or different manner at each occurrence h or N, and at least two of H1-H6 are N, and at least one of H1-H6 is C, and is connected to formula A; in, Q is the same or different each time it appears and is selected from O, S, Se, N, NR Q , CR Q R Q ,SiR Q R Q ,GeR Q R Q and R Q C=CR Q When there are two R Q When two R Q Can be the same or different; p is 0 or 1; r is 0 or 1; When Q is selected from N, p is 0 and r is 1; When Q is selected from O, S, Se, NR Q , CR Q R Q ,SiR Q R Q ,GeR Q R Q and R Q C=CR Q When the group is composed, p is 1 and r is 0; L Q The second occurrences are identically or differently selected from a single bond, a substituted or unsubstituted alkylene group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkylene group having 3 to 20 carbon atoms, a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, a substituted or unsubstituted heteroarylene group having 3 to 20 carbon atoms, or a combination thereof; Q1-Q8 are selected from C, CR in the same or different manner at each occurrence q or N; R h , R Q and R q Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted Alkynyl groups having 2 to 20 carbon atoms, substituted or unsubstituted aryl groups having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6 to 20 carbon atoms, substituted or unsubstituted alkylgermanyl groups having 3 to 20 carbon atoms, substituted or unsubstituted arylgermanyl groups having 6 to 20 carbon atoms, substituted or unsubstituted amino groups having 0 to 20 carbon atoms, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof; "*" represents the connection position between formula A and formula Y; Adjacent substituent R h , R Q , R q Can optionally be linked to form a ring.

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

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