Organic light-emitting device

Abstract

The invention relates to an organic light-emitting device, and relates to the technical field of semiconductors, the organic light-emitting device comprises a substrate, a first electrode, an organic functional layer and a second electrode, the organic functional layer is located between the first electrode and the second electrode, the organic functional layer comprises at least one light-emitting layer, and the light-emitting layer is located between the first electrode and the second electrode. The light-emitting layer comprises a main body material, a phosphorescence sensitizer and a boron-containing fluorescent material, and the height of an intersection point of an emission spectrum of a first doped film formed by the phosphorescence sensitizer and the main body material and an absorption spectrum of a second doped film formed by the boron-containing fluorescent material and the main body material after normalization processing in a wavelength range of 500 nm to 550 nm is greater than or equal to 0.7; the mass ratio of the phosphorescent sensitizer to the main body material in the first doped film is 1: 99-15: 85, and the mass ratio of the boron-containing fluorescent material to the main body material in the second doped film is 0.5: 99.5-5: 95, so that under the composition system, the problems of wide half-peak width of the phosphorescent material and the like can be solved, and the efficiency of the device is improved.

Description

Technical Field

[0001] The present invention relates to the field of semiconductor technology, and in particular to an organic electroluminescent device. Background Art

[0002] Compared to liquid crystal displays (LCDs), organic light-emitting diodes (OLEDs) boast technological advantages such as lighter weight, thinner design, higher color contrast, lower power consumption, faster response, higher definition, and greater flexibility, and are considered to dominate future display terminal products. With the advent of the 5G era, the emerging information display industry urgently needs iterative development. The earlier, lower color gamut standards (BT.709 and DCIP3) are no longer sufficient to meet the high-quality technological development requirements of display products. To achieve the ultra-high definition and higher-quality performance requirements of display products, the next-generation display standard (BT.2020) is driving the development of OLED luminescent materials towards higher color purity, which requires core luminescent materials to have narrower emission spectra.

[0003] Traditional green light display technology relies on the phosphorescent luminescence mechanism. The only carrier in the light-emitting layer is the phosphorescent material. Therefore, the charge pressure borne by the material is extremely high, and the energy transfer and transfer processes in the device are relatively simple. The device emission spectrum is wide and the shoulder peak is relatively high. In the industrialized OLED green light device, the top-emission-bottom emission efficiency reversal ratio is sacrificed. Therefore, the efficiency and life bottlenecks ultimately achieved in the device are relatively obvious, and it is difficult to achieve a narrower half-width and color purity, which is quite different from the requirements of high-definition display indicators. Therefore, it is very critical to develop a new generation of green light display technology and apply it to green light devices.

[0004] Since 2020, green light materials with narrow half-width (half-width <30nm) based on boron nitride resonance structures have been reported one after another: and from 22 to 23, many green light boron nitride narrow emission materials and device effects were reported one after another, such as: DOI: 10.1002 / anie.202301930, DOI: 10.1038 / s41566-022-01106-8, DOI: 10.1002 / anie.202313254, DOI: 10.1038 / s41566-022-01083-y, DOI: 10.1002 / anie.202202380, etc., showing the high color purity and efficiency of this type of material. As a new generation of green light organic electroluminescent display materials, it has great potential, but its efficiency and lifespan are still difficult to meet the requirements of commercial applications.

[0005] Sensitization technology combines triplet exciton-sensitizing materials (including but not limited to TADF materials and phosphorescent materials) with fluorescent dopant materials. Using triplet exciton-sensitizing materials as exciton sensitization media, the triplet excitons are fully utilized and transferred to the fluorescent dopant through energy transfer. This sensitization technology can separate the processes of carrier recombination and exciton energy luminescence in OLED devices. The sensitizer is responsible for the mixing of singlet and triplet excitons in the electroluminescent process, while the sensitized material is responsible for emitting the energy transferred by the sensitizer as light. This reduces or even avoids triplet instability and low exciton utilization, and increases multiple effective energy transfer channels, reducing the decline in device efficiency and lifespan caused by the long residence time of energy on a single carrier (DOI: 10.1002 / tcr.201800148). Therefore, in essence, the sensitization mechanism is a further optimization of the traditional phosphorescent luminescence mechanism, which distributes the charge pressure in the electroluminescent process to carriers that play different key roles in the light-emitting layer. This can achieve further improvements in efficiency and lifespan based on traditional phosphorescent devices (DOI: 10.1038 / s41566-022-00958-4).

[0006] In the light-emitting layer of the device, the main body, sensitizer, and sensitized fluorescent material each play their own role in the device, but the sensitization mechanism is highly dependent on the matching relationship between the main body, sensitizer, and sensitized material. Therefore, there are high requirements on the interaction relationship and spectral adaptability of different components. Only when each link in the sensitization process is matched with each other can beneficial technical effects be produced. Summary of the Invention

[0007] The present invention provides an organic electroluminescent device, which uses a phosphorescent sensitizer to sensitize a boron-containing fluorescent material to emit light, thereby improving the problem of a single phosphorescent material having a wide half-peak width and improving the efficiency and life of the device.

[0008] The present invention provides a specific technical solution as follows: an organic electroluminescent device, comprising a substrate, a first electrode, an organic functional layer, and a second electrode, wherein the organic functional layer is located between the first electrode and the second electrode, and the organic functional layer includes at least one light-emitting layer, wherein the light-emitting layer includes a host material, a phosphorescent sensitizer, and a boron-containing fluorescent material, wherein the height of the intersection of an emission spectrum of a first doped film formed by the phosphorescent sensitizer and the host material and an absorption spectrum of a second doped film formed by the boron-containing fluorescent material and the host material after normalization within a wavelength range of 500 nm to 550 nm is ≥0.7, the mass ratio of the phosphorescent sensitizer to the host material in the first doped film is 1:99-15:85, and the mass ratio of the boron-containing fluorescent material to the host material in the second doped film is 0.5:99.5-5:95.

[0009] Furthermore, the height of the intersection between the emission spectrum of the phosphorescent sensitizer and the spectrum of the boron-containing fluorescent material in the absorption wavelength range of 500 nm to 550 nm is ≥0.8.

[0010] Furthermore, the height of the intersection between the emission spectrum of the phosphorescent sensitizer and the spectrum of the boron-containing fluorescent material in the absorption wavelength range of 500 nm to 550 nm is ≥0.9.

[0011] Furthermore, the boron-containing fluorescent material has a resonance frame, a luminescence peak in the range of 500nm to 540nm, and a half-peak width less than 30nm.

[0012] Furthermore, the ratio of the shoulder peak height to the main peak height of the emission spectrum of the second doped film formed by the boron-containing fluorescent material and the host material is ≤0.3.

[0013] Furthermore, the luminescence peak of the boron-containing fluorescent material is between 515 and 535 nm.

[0014] Furthermore, the boron-containing fluorescent material is selected from the structure shown in general formula (1):

[0015]

[0016] In the general formula (1), each occurrence of Ar1, Ar2, and Ar3 independently represents a hydrogen atom, a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R, a C3-C10 heterocycloalkyl group substituted or unsubstituted by a substituent R, a C6-C30 aryl group substituted or unsubstituted by a substituent R, or a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R, and Ar1, Ar2, and Ar3 are not simultaneously represented by a hydrogen atom;

[0017] Ar1, Ar2, and Ar3 can be linked to each other to form a C6-C30 aromatic ring substituted or unsubstituted by a substituent R, a C2-C30 heteroaromatic ring substituted or unsubstituted by a substituent R, or a C6-C10 aliphatic ring substituted or unsubstituted by a substituent R;

[0018] The substituent R, which is the same or different each time, is represented by one of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R';

[0019] The substituent R' is selected from one or more of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group, a C3-C10 cycloalkyl group, a C1-C10 alkoxy group, a C6-C10 aryloxy group, a C6-C30 aryl group, and a C2-C30 heteroaryl group;

[0020] The heteroatoms in the heteroaryl group and the heteroaryl ring are selected from one or more of O, S, N, Si and B.

[0021] Furthermore, the boron-containing fluorescent material is selected from any one of the general formulas (1-1) to (1-5):

[0022]

[0023] In general formulas (1-1) to (1-5), each occurrence of M1, M2, M3, M4, and M5 independently represents one of a C6-C30 aromatic ring substituted or unsubstituted by a substituent R, a C2-C30 heteroaromatic ring substituted or unsubstituted by a substituent R, and a C6-C10 aliphatic ring substituted or unsubstituted by a substituent R;

[0024] Each occurrence of X1, X2, X3, and X4 is independently represented by O, S, N (R a )、C(R b )(R c );

[0025] X5、X6、X7、X8、X9、X 10 Each occurrence is independently represented as a single bond, O, S, N(R a )、C(R b )(R c );

[0026] a, b, c, d are each independently 0 or 1, and a+b+c+d=2;

[0027] e and f are independently represented as 0 or 1;

[0028] The R a 、R b 、R c Each occurrence independently represents one of a hydrogen atom, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R';

[0029] R a 、R b 、R c can be connected to M1, M2, M3 or M4 to form a C6-C30 aromatic ring substituted or unsubstituted by a substituent R, a C2-C30 heteroaromatic ring substituted or unsubstituted by a substituent R, or a C6-C10 aliphatic ring substituted or unsubstituted by a substituent R;

[0030] The substituent R, which is the same or different each time, is represented by one of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R';

[0031] The substituent R' is selected from one or more of deuterium, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterium-substituted C1-C10 alkyl group, a C6-C30 aryl group, a deuterium-substituted C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterium-substituted C2-C30 heteroaryl group;

[0032] The heteroatoms in the heteroaryl group and the heteroaryl ring are selected from one or more of O, S, N, Si and B.

[0033] Furthermore, the boron-containing fluorescent material is selected from any one of the general formulas (1-6) to (1-12):

[0034]

[0035] In general formulas (1-6) to (1-12), each occurrence of Z is identical or different and represents N or C-R1;

[0036] Each occurrence of R1 is independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', or a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R';

[0037] Any two adjacent R1s may be connected to form a C6-C30 aromatic ring substituted or unsubstituted by a substituent R, a C2-C30 heteroaromatic ring substituted or unsubstituted by a substituent R, or a C6-C10 aliphatic ring substituted or unsubstituted by a substituent R;

[0038] Each occurrence of M1, M2, and M3 independently represents one of a C6-C30 aromatic ring substituted or unsubstituted by a substituent R, a C2-C30 heteroaromatic ring substituted or unsubstituted by a substituent R, and a C6-C10 aliphatic ring substituted or unsubstituted by a substituent R;

[0039] Each occurrence of X1, X2, X3, and X4 is independently represented by O, S, N (R a )、C(R b )(R c );

[0040] R a 、R b 、R cEach occurrence independently represents one of a hydrogen atom, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R';

[0041] R m 、R n Each occurrence independently represents one of a hydrogen atom, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R';

[0042] R a 、R b 、R c can be connected to M1, M2, M3 or M4 to form a C6-C30 aromatic ring substituted or unsubstituted by a substituent R, a C2-C30 heteroaromatic ring substituted or unsubstituted by a substituent R, or a C6-C10 aliphatic ring substituted or unsubstituted by a substituent R;

[0043] R a 、R b 、R c Can be connected to adjacent R1 to form C6~C 30 One of an aromatic ring, a C2-C30 heteroaromatic ring substituted or unsubstituted by a substituent R, and a C6-C10 aliphatic ring substituted or unsubstituted by a substituent R;

[0044] Each occurrence of the substituent R is independently one of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R';

[0045] The substituent R' is selected from one or more of deuterium, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterium-substituted C1-C10 alkyl group, a C6-C30 aryl group, a deuterium-substituted C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterium-substituted C2-C30 heteroaryl group;

[0046] The heteroatoms in the heteroaryl group and the heteroaryl ring are selected from one or more of O, S, N, Si and B.

[0047] Furthermore, the boron-containing fluorescent material is selected from the structure represented by any one of the general formulas (1-13) to (1-18):

[0048]

[0049] In general formula (1-13) to general formula (1-18), each occurrence of Z is identical or different and represents N or C-R1;

[0050] Each occurrence of R1 is independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', or a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R';

[0051] Any two adjacent R1s may be connected to form a C6-C30 aromatic ring substituted or unsubstituted by a substituent R, a C2-C30 heteroaromatic ring substituted or unsubstituted by a substituent R, or a C6-C10 aliphatic ring substituted or unsubstituted by a substituent R;

[0052] Each occurrence of X5, X6, X7, and X8 independently represents a single bond, O, S, N (R a )、C(R b )(R c );

[0053] a, b, c, d are each independently 0 or 1, and a+b+c+d=2;

[0054] R a 、R b 、R c Each occurrence independently represents one of a hydrogen atom, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R';

[0055] R a 、R b 、R c Can be connected to adjacent R1 to form C6~C 30 One of an aromatic ring, a C2-C30 heteroaromatic ring substituted or unsubstituted by a substituent R, and a C6-C10 aliphatic ring substituted or unsubstituted by a substituent R;

[0056] Each occurrence of the substituent R is independently one of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R';

[0057] The substituent R' is selected from one or more of deuterium, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterium-substituted C1-C10 alkyl group, a C6-C30 aryl group, a deuterium-substituted C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterium-substituted C2-C30 heteroaryl group;

[0058] The heteroatoms in the heteroaryl group and the heteroaryl ring are selected from one or more of O, S, N, Si and B.

[0059] Furthermore, the boron-containing fluorescent material is selected from the following structures:

[0060]

[0061]

[0062]

[0063]

[0064]

[0065]

[0066]

[0067] Furthermore, the host material includes a first host material and a second host material, the first host material is a hole-type host material, and the second host material is an electron-type host material.

[0068] Furthermore, the first host material is selected from the structure represented by general formula (2-1) or general formula (2-2):

[0069]

[0070] In the general formula (2-1) and the general formula (2-2), each occurrence of Ring A, Ring B, Ring C, and Ring D independently represents a C6-C30 aryl group which is substituted or unsubstituted by a substituent R', or a C2-C30 heteroaryl group which is substituted or unsubstituted by a substituent R';

[0071] Each occurrence of L1, L2, L3, and L4 independently represents a single bond, a C6-C30 arylene group substituted or unsubstituted by a substituent R', or a C2-C30 heteroarylene group substituted or unsubstituted by a substituent R';

[0072] Ar1, Ar2, Ar3, and Ar4 each independently represent one of a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C3-C10 heterocycloalkyl group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R';

[0073] The substituent R' is selected from one or more of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterated C1-C10 alkyl group, a C3-C10 cycloalkyl group, a deuterated C3-C10 cycloalkyl group, a C6-C30 aryl group, a deuterated C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterated C2-C30 heteroaryl group;

[0074] The heteroatoms in the heteroaryl and heterocycloalkyl groups are selected from one or more of O, S, N, and Si.

[0075] Furthermore, the first host material is selected from the structure represented by general formula (2-3) or general formula (2-4):

[0076]

[0077] In the general formula (2-3) and the general formula (2-4), each occurrence of L1, L2, L3, and L4 independently represents a single bond, a C6-C30 arylene group substituted or unsubstituted by a substituent R', or a C2-C30 heteroarylene group substituted or unsubstituted by a substituent R';

[0078] Ar1, Ar2, Ar3, and Ar4 each independently represent one of a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C3-C10 heterocycloalkyl group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R';

[0079] R2, R3, R4, and R5 each independently represent one of a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C3-C10 heterocycloalkyl group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C10 aryloxy group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R';

[0080] The i, j, p, and q are independently represented by 0, 1, 2, 3, or 4;

[0081] The substituent R' is selected from one or more of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterated C1-C10 alkyl group, a C3-C10 cycloalkyl group, a deuterated C3-C10 cycloalkyl group, a C6-C30 aryl group, a deuterated C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterated C2-C30 heteroaryl group;

[0082] The heteroatoms in the heteroaryl and heterocycloalkyl groups are selected from one or more of O, S, N, and Si.

[0083] Furthermore, the first host material is selected from the structures represented by general formula (2-5) to general formula (2-9):

[0084]

[0085] In general formulas (2-5) to (2-9), each occurrence of L1, L2, L3, and L4 independently represents a single bond, a C6-C30 arylene group substituted or unsubstituted by a substituent R', or a C2-C30 heteroarylene group substituted or unsubstituted by a substituent R';

[0086] Ar1, Ar2, Ar3, and Ar4 each independently represent one of a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C3-C10 heterocycloalkyl group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R';

[0087] R2, R3, R4, and R5 each independently represent one of a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C3-C10 heterocycloalkyl group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C10 aryloxy group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R';

[0088] The i, j, p, and q are independently represented by 0, 1, 2, 3, or 4;

[0089] The substituent R' is selected from one or more of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterated C1-C10 alkyl group, a C3-C10 cycloalkyl group, a deuterated C3-C10 cycloalkyl group, a C6-C30 aryl group, a deuterated C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterated C2-C30 heteroaryl group;

[0090] The heteroatoms in the heteroaryl and heterocycloalkyl groups are selected from one or more of O, S, N, and Si.

[0091] Furthermore, the first main material is selected from the following structure:

[0092]

[0093]

[0094]

[0095]

[0096] Furthermore, the second main material is selected from the structure shown in general formula (3):

[0097]

[0098] In the general formula (3), Z1 to Z5 are independently N or C-R6;

[0099] The R6 is represented by a hydrogen atom, a deuterium atom, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a silyl group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C2-C20 alkenyl group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aralkyl group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', or a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'. Any adjacent R6s may be connected to form a C6-C30 aromatic ring substituted or unsubstituted by a substituent R', or a C2-C30 heteroaromatic ring substituted or unsubstituted by a substituent R';

[0100] L5, L6, and L7 each independently represent a single bond, a C6-C30 arylene group substituted or unsubstituted by a substituent R', or a C2-C30 heteroarylene group substituted or unsubstituted by a substituent R';

[0101] Ar5, Ar6, and Ar7 each independently represent a hydrogen atom, a C3-C10 cycloalkyl group which may be substituted by a substituent R', a C6-C30 aryl group which may be substituted by a substituent R', or a C2-C30 heteroaryl group which may be substituted by a substituent R';

[0102] The substituent R' is selected from one or more of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterated C1-C10 alkyl group, a C3-C10 cycloalkyl group, a deuterated C3-C10 cycloalkyl group, a C6-C30 aryl group, a deuterated C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterated C2-C30 heteroaryl group;

[0103] The heteroatoms in the heteroaryl group are selected from one or more of O, S, N, and Si.

[0104] Furthermore, the second host material is selected from the structure represented by general formula (3-1) or general formula (3-2):

[0105]

[0106] In the general formula (3-1) and the general formula (3-2), L5, L6, and L7 each independently represent a single bond, a C6-C30 arylene group substituted or unsubstituted by a substituent R', or a C2-C30 heteroarylene group substituted or unsubstituted by a substituent R';

[0107] Ar5, Ar6, and Ar7 each independently represent a hydrogen atom, a C3-C10 cycloalkyl group which may be substituted by a substituent R', a C6-C30 aryl group which may be substituted by a substituent R', or a C2-C30 heteroaryl group which may be substituted by a substituent R';

[0108] The substituent R' is selected from one or more of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterated C1-C10 alkyl group, a C3-C10 cycloalkyl group, a deuterated C3-C10 cycloalkyl group, a C6-C30 aryl group, a deuterated C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterated C2-C30 heteroaryl group;

[0109] The heteroatoms in the heteroaryl group are selected from one or more of O, S, N, and Si.

[0110] Furthermore, the second main material is selected from the following structure:

[0111]

[0112]

[0113]

[0114]

[0115] Furthermore, the phosphorescence sensitizer is selected from the structure shown in general formula (4):

[0116] M(L a ) m (L b ) n General formula (4)

[0117] In the general formula (4), M represents one of Ir and Pt;

[0118] L a and L b are all ligands, m represents 0, 1, 2, or 3, n represents 0, 1, 2, or 3, and m+n is 3;

[0119] The L a and L b It can be represented as the following structure:

[0120]

[0121] Each occurrence of Z is represented identically or differently as N or C-R1;

[0122] Each occurrence of R1 is independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', or a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R';

[0123] Y represents O, S, N (R a )、C(R b )(R c );

[0124] R a 、R b 、R c Each occurrence independently represents one of a hydrogen atom, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R';

[0125] The substituent R' is selected from one or more of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterated C1-C10 alkyl group, a fluorinated C1-C10 alkyl group, a C3-C10 cycloalkyl group, a deuterated C3-C10 cycloalkyl group, a C6-C30 aryl group, a deuterated C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterated C2-C30 heteroaryl group;

[0126] The heteroatoms in the heteroaryl group are selected from one or more of O, S, N, Si, and P;

[0127] Preferably, the L a and L b It can be represented as the following structure:

[0128]

[0129] R7~R 16 Each occurrence independently represents one of a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R';

[0130] Y represents O, S, N (R a )、C(R b )(R c );

[0131] R a 、R b 、R c Each occurrence independently represents one of a hydrogen atom, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R';

[0132] The substituent R' is selected from one or more of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterated C1-C10 alkyl group, a fluorinated C1-C10 alkyl group, a C3-C10 cycloalkyl group, a deuterated C3-C10 cycloalkyl group, a C6-C30 aryl group, a deuterated C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterated C2-C30 heteroaryl group;

[0133] The heteroatoms in the heteroaryl group are selected from one or more of O, S, N, Si, and P.

[0134] Furthermore, the phosphorescence sensitizer is selected from the structure represented by any one of the general formulas (5-1) to (5-6):

[0135]

[0136] m represents 0, 1, 2, or 3, n represents 0, 1, 2, or 3, and m+n is 3;

[0137] Each occurrence of Z is represented identically or differently as N or C-R1;

[0138] Each occurrence of R1 is independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', or a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R';

[0139] Y represents O, S, N (R a )、C(R b )(R c );

[0140] Y1, Y2, Y3, Y4 represent single bonds, O, S, N (R a )、C(R b )(R c );

[0141] i, j, p, q are represented as 0 or 1;

[0142] R a 、R b 、R c Each occurrence independently represents one of a hydrogen atom, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R';

[0143] The substituent R' is selected from one or more of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterated C1-C10 alkyl group, a fluorinated C1-C10 alkyl group, a C3-C10 cycloalkyl group, a deuterated C3-C10 cycloalkyl group, a C6-C30 aryl group, a deuterated C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterated C2-C30 heteroaryl group;

[0144] The heteroatoms in the heteroaryl group are selected from one or more of O, S, N, Si, and P;

[0145] Preferably, the phosphorescence sensitizer is selected from Ir and Pt green phosphorescent materials, preferably green phosphorescent materials with a bottom emission peak narrower than 40nm; preferably, the phosphorescence sensitizer is selected from the following structure:

[0146]

[0147]

[0148] Preferably, the host material comprises a first host material and a second host material, and at least one of the first host material and the second host material is a TADF material.

[0149] Preferably, the phosphorescent sensitizer material is selected from Ir and Pt type green phosphorescent materials.

[0150] Preferably, the phosphorescent sensitizer is a system with a bottom emission peak narrower than 40 nm.

[0151] At least one light-emitting layer of the organic electroluminescent device of the present invention is a phosphorescence-sensitized light-emitting layer. The composition system of the phosphorescence-sensitized light-emitting layer includes a host material, a phosphorescence sensitizer and a boron-containing fluorescent material. The height of the intersection of the emission spectrum of the phosphorescence sensitizer and the absorption spectrum of the boron-containing fluorescent material in the wavelength range of 500nm to 550nm is ≥0.7. Under such a composition system, the use of the phosphorescence material to sensitize the boron-containing fluorescent material to emit light can improve problems such as the wide half-peak width of the phosphorescence material itself, and can significantly improve the efficiency and life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0152] Figure 1 This is a schematic diagram of the structure of an OLED device in which the materials listed in the present invention are applied;

[0153] Among them, 1 is a transparent substrate layer, 2 is an anode layer, 3 is a hole injection layer, 4 is a hole transport layer, 5 is an electron blocking layer, 6 is a light-emitting layer, 7 is a hole blocking layer, 8 is an electron transport layer, 9 is an electron injection layer, and 10 is a cathode layer.

[0154] Figure 2 This is the emission spectrum of the GD-1 doped film;

[0155] Figure 3 This is a schematic diagram of the intersection height of combinations 1-6;

[0156] Figure 4 Schematic diagram of the intersection height of combination 1-3. DETAILED DESCRIPTION

[0157] In the drawings, the dimensions of layers and regions may be exaggerated for clarity. It will also be understood that when a layer or element is referred to as being "on" another layer or substrate, the layer or element may be directly on the other layer or substrate, or intervening layers may be present. Furthermore, it will be understood that when a layer is referred to as being "between" two layers, the layer may be the only layer between the two layers, or one or more intervening layers may be present. Like reference numerals refer to like elements throughout.

[0158] In the present invention, when describing electrodes, organic electroluminescent devices, and other structures, terms such as "upper," "lower," "top," and "bottom" that indicate orientation refer only to a particular state and do not imply that the structure can exist only in the described orientation. Conversely, if the structure can be repositioned, such as inverted, the orientation of the structure will change accordingly. Specifically, in the present invention, the "bottom" or "lower" side of an electrode refers to the side of the electrode closest to the substrate during fabrication, while the opposite side, farther from the substrate, is the "top" or "upper" side.

[0159] In the present invention, the substituted or unsubstituted aromatic amine group is wherein Q1 and Q2 represent substituted or unsubstituted C6-C30 aryl or substituted or unsubstituted C2-C30 heteroaryl.

[0160] In the present invention, the substituted or unsubstituted C6-C30 aryl group refers to an aryl group having 6 to 30 carbon atoms, preferably an aryl group having 6 to 20 carbon atoms, preferably an aryl group having 6 to 10 carbon atoms, preferably a substituted or unsubstituted phenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted anthracenyl group, a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted dimethylfluorenyl group, a substituted or unsubstituted diphenylfluorenyl group, a substituted or unsubstituted spirofluorenyl group, a substituted or unsubstituted phenanthrenyl group, a substituted or unsubstituted tetraphenyl group, a substituted or unsubstituted pyrenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted p-terphenyl group, a substituted or unsubstituted m-terphenyl group, a substituted or unsubstituted The present invention can be a fused ring of a substituted or unsubstituted triphenylene group, a substituted or unsubstituted perylenyl group, a substituted or unsubstituted indenyl group, a combination thereof, or a combination of the foregoing groups, but is not limited thereto.

[0161] In the present invention, the C6-C30 aromatic ring refers to an aromatic ring having 6 to 30 carbon atoms, preferably an aromatic ring having 6 to 20 carbon atoms, preferably an aromatic ring having 6 to 10 carbon atoms, preferably a substituted or unsubstituted phenyl, a substituted or unsubstituted naphthyl, a substituted or unsubstituted anthracenyl, a substituted or unsubstituted fluorenyl, a substituted or unsubstituted dimethylfluorenyl, a substituted or unsubstituted diphenylfluorenyl, a substituted or unsubstituted spirofluorenyl, a substituted or unsubstituted phenanthrenyl, a substituted or unsubstituted tetraphenyl, a substituted or unsubstituted pyrenyl, a substituted or unsubstituted biphenyl, a substituted or unsubstituted p-terphenyl, a substituted or unsubstituted m-terphenyl, a substituted or unsubstituted The present invention can be a fused ring of a substituted or unsubstituted triphenylene group, a substituted or unsubstituted perylenyl group, a substituted or unsubstituted indenyl group, a combination thereof, or a combination of the foregoing groups, but is not limited thereto.

[0162] In the present invention, the substituted or unsubstituted C2-C30 heteroaryl group refers to a heteroaryl group having 2 to 30 carbon atoms, preferably a heteroaryl group having 4 to 20 carbon atoms, preferably a heteroaryl group having 5 to 20 carbon atoms, preferably a heteroaryl group having 4 to 10 carbon atoms, preferably a heteroaryl group having 5 to 10 carbon atoms, and is preferably a substituted or unsubstituted furyl group, a substituted or unsubstituted thienyl group, a substituted or unsubstituted pyrrolyl group, a substituted or unsubstituted pyrazolyl group, a substituted or unsubstituted imidazolyl group, a substituted or unsubstituted triazolyl group, a substituted or unsubstituted oxazolyl group, a substituted or unsubstituted thiazolyl group, a substituted or unsubstituted oxadiazolyl group, a substituted or unsubstituted thiadiazolyl group, a substituted or unsubstituted pyridyl group, a substituted or unsubstituted pyrimidinyl group, a substituted or unsubstituted pyrazinyl group, a substituted or unsubstituted The present invention also includes but is not limited to a substituted or unsubstituted triazinyl, a substituted or unsubstituted benzofuranyl, a substituted or unsubstituted benzothiophenyl, a substituted or unsubstituted benzimidazolyl, a substituted or unsubstituted indolyl, a substituted or unsubstituted quinolyl, a substituted or unsubstituted isoquinolyl, a substituted or unsubstituted quinazolinyl, a substituted or unsubstituted quinoxalinyl, a substituted or unsubstituted naphthyridinyl, a substituted or unsubstituted benzoxazinyl, a substituted or unsubstituted benzothiazinyl, a substituted or unsubstituted acridinyl, a substituted or unsubstituted phenanthazinyl, a substituted or unsubstituted phenathiazinyl, a substituted or unsubstituted phenoxazinyl, a substituted or unsubstituted fluorenyl, a substituted or unsubstituted dibenzofuranyl, a substituted or unsubstituted dibenzothiophenyl, a substituted or unsubstituted carbazolyl, a combination thereof, or a fused ring of a combination of the foregoing groups, but is not limited thereto.

[0163] In the present invention, the substituted or unsubstituted C2-C30 heteroaromatic ring is preferably a substituted or unsubstituted furyl, a substituted or unsubstituted thienyl, a substituted or unsubstituted pyrrolyl, a substituted or unsubstituted pyrazolyl, a substituted or unsubstituted imidazolyl, a substituted or unsubstituted triazolyl, a substituted or unsubstituted oxazolyl, a substituted or unsubstituted thiazolyl, a substituted or unsubstituted oxadiazolyl, a substituted or unsubstituted thiadiazolyl, a substituted or unsubstituted pyridyl, a substituted or unsubstituted pyrimidinyl, a substituted or unsubstituted pyrazinyl, a substituted or unsubstituted triazinyl, a substituted or unsubstituted benzofuranyl, a substituted or unsubstituted benzothienyl, a substituted or unsubstituted benzo The present invention also includes imidazolyl, substituted or unsubstituted indolyl, substituted or unsubstituted quinolyl, substituted or unsubstituted isoquinolyl, substituted or unsubstituted quinazolinyl, substituted or unsubstituted quinoxalinyl, substituted or unsubstituted naphthyridinyl, substituted or unsubstituted benzoxazinyl, substituted or unsubstituted benzothiazinyl, substituted or unsubstituted acridinyl, substituted or unsubstituted phenanthrazinyl, substituted or unsubstituted phenathiazinyl, substituted or unsubstituted phenoxazinyl, substituted or unsubstituted fluorenyl, substituted or unsubstituted dibenzofuranyl, substituted or unsubstituted dibenzothiophenyl, substituted or unsubstituted carbazolyl, combinations thereof, or fused rings of combinations of the foregoing groups, but is not limited thereto.

[0164] In the present invention, the heteroatom in the heteroaryl group is selected from one or more of O, S, N, Si, and B.

[0165] In the present invention, the number of heteroatoms in the substituted or unsubstituted C2-C30 heteroaryl group is 1-5, preferably 1-4, preferably 1-3, and more preferably 1-2.

[0166] The C1-C10 alkyl group (including straight-chain alkyl groups and branched-chain alkyl groups) described in the present invention refers to an alkyl group with 1 to 10 carbon atoms, preferably an alkyl group with 1 to 5 carbon atoms, preferably an alkyl group with 1 to 4 carbon atoms, preferably a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a tert-butyl group, an isobutyl group, a sec-butyl group, a neopentyl group, an n-pentyl group, an isopentyl group, an octyl group, a heptyl group, a n-decyl group, a 1-methylpentyl group, a 2-methylpentyl group, a 3-methylpentyl group, a 1-butylpentyl group, etc., but is not limited thereto.

[0167] The C3-C10 cycloalkyl group of the present invention refers to a monovalent monocyclic saturated hydrocarbon group containing 3 to 10 carbon atoms as ring atoms. In this context, a C4-C9 cycloalkyl group is preferably used, a C5-C8 cycloalkyl group is more preferably used, and a C5-C7 cycloalkyl group is particularly preferably used. Non-limiting examples thereof include, but are not limited to, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4,4-dimethylcyclohexyl, adamantyl, and cycloheptyl.

[0168] The halogen atom mentioned in the present invention refers to a fluorine atom, a chlorine atom, a bromine atom or an iodine atom.

[0169] The C1-C10 alkoxy group in the present invention refers to methoxy, ethoxy, propoxy, butoxy, pentyloxy, hexyloxy or isopropoxy, but is not limited thereto.

[0170] The C2-C10 alkenyl group described in the present invention refers to vinyl, allyl, 1-butenyl, 2-butenyl, 3-butenyl, 1,3-butadienyl, 1-methylvinyl, styryl, 2,2-diphenylvinyl, 1,2-diphenylvinyl, 1,1-dimethylallyl, 1-methylallyl, 2-methylallyl, 1-phenylallyl, 2-phenylallyl, 3,3-diphenylallyl, 1,2-dimethylallyl, 1-phenyl-1-butenyl and 3-phenyl-1-butenyl, etc., but is not limited thereto.

[0171] The substituents are optionally selected from one or more of a deuterium atom, a chlorine atom, a fluorine atom, a trifluoromethyl group, an adamantyl group, a cyano group, a methyl group, an ethyl group, a propyl group, an isopropyl group, a tert-amyl group, a tert-butyl group, a butyl group, a methoxy group, a phenyl group, a biphenyl group, a naphthyl group, an anthracenyl group, a phenanthrenyl group, a pyridyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a benzoxazolyl group, a benzothiazolyl group, a quinoxalinyl group, a quinolyl group, an isoquinolyl group, a furanyl group, a thienyl group, an indolyl group, a pyrrolyl group, a dibenzofuranyl group, a dibenzothienyl group, a 9,9-dimethylfluorenyl group, a spirofluorenyl group, a carbazolyl group, an N-phenylcarbazolyl group, a carbazolinyl group, and an azaphenanthrenyl group.

[0172] The organic electroluminescent device of the present invention may be a bottom-emitting organic electroluminescent device, a top-emitting organic electroluminescent device, or a stacked organic electroluminescent device, without particular limitation.

[0173] The organic electroluminescent device of the present invention comprises a substrate, a first electrode, an organic functional layer, and a second electrode. The organic functional layer may include a hole transport region, a light-emitting layer, and an electron transport region. The hole transport region may include a hole injection layer, a hole transport layer, and an electron blocking layer. The electron transport region may include a hole blocking layer, an electron transport layer, and an electron injection layer. Furthermore, a CPL layer may be provided on the second electrode.

[0174] As the substrate for the organic electroluminescent device of the present invention, any substrate commonly used for organic electroluminescent devices can be used. Examples include transparent substrates such as glass or transparent PI film substrates; and opaque substrates such as silicon substrates. Different substrates have varying mechanical strength, thermal stability, transparency, surface smoothness, and water resistance. Depending on the properties of the substrate, its use varies. In the present invention, a transparent PI film substrate is preferably used. The thickness of the substrate is not particularly limited.

[0175] A first electrode is formed on a substrate, and the first electrode and the second electrode may be opposite to each other. The first electrode may be an anode. The first electrode may be a transmissive electrode, a semi-transmissive electrode, or a reflective electrode. When the first electrode is a transmissive electrode, it may be formed using a transparent metal oxide, such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), or indium tin zinc oxide (ITZO). When the first electrode is a semi-transmissive electrode or a reflective electrode, it may include a metal such as Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, or Cr, or an alloy of several metals, or a combination of metals, metal oxides, or metal alloys. The thickness of the first electrode layer depends on the material used, and is typically 50-500 nm, preferably 70-300 nm, and more preferably 100-200 nm.

[0176] The organic functional layer disposed between the first electrode and the second electrode may include, from bottom to top, a hole transport region, a light emitting layer, and an electron transport region.

[0177] In the present invention, examples of the hole transport region constituting the organic electroluminescent device include a hole injection layer, a hole transport layer, and an electron blocking layer.

[0178] As materials for the hole injection layer, the hole transport layer, and the electron blocking layer, any material can be selected from known materials used in organic electroluminescent devices.

[0179] The hole injection layer contains a host organic material that can conduct holes, and also contains a P-type dopant material with a deep HOMO energy level (the corresponding LUMO energy level will also be very deep). Based on empirical summary, in order to achieve smooth hole injection from the anode to the organic film layer, the HOMO energy level of the host organic material used in the anode interface buffer layer must have certain characteristics with the P-doped material. Only then can the charge transfer state between the host material and the dopant material be achieved, and ohmic contact between the buffer layer and the anode can be achieved, achieving efficient injection and conduction of holes from the electrode.

[0180] In view of the above empirical summary, for hole-type host organic materials with different HOMO energy levels, different P-doped materials need to be selected to match them in order to achieve ohmic contact at the interface and improve the hole injection effect.

[0181] Preferably, the host organic material of the hole injection layer of the present invention can be selected from the following compounds disclosed in the prior art: JP1996048656A, JP1996048656A, CN1702065A, CN101535256A, CN103108859A, US20120112176A1, JP1989142657A, CN105439999A or CN103108859A.

[0182] Preferably, the P-type doping material is a compound with charge conductivity selected from the prior art, and the P-type dopant can be selected from the compounds disclosed in any one of the following documents: WO2011073149A, EP1968131A1, EP2276085A1, EP2213662A1, EP1722602A1, EP2045848A1, DE10200703122 0A1, US20100181555A1, US20100102709A1, WO2009003455A1, WO2010094378A1, WO2011120709A1, US20100096600A1, DE102012209523A1, CN101728485A and WO2012095143A1, but are not limited thereto.

[0183] In the hole injection layer of the present invention, the ratio of the hole transport material to the P-type doping material is 99:1-95:5, preferably 99:1-97:3, based on mass.

[0184] The thickness of the hole injection layer of the present invention may be 5-100 nm, preferably 5-50 nm, and more preferably 5-20 nm, but the thickness is not limited to this range.

[0185] Preferably, the hole transport layer material of the present invention may be selected from the following compounds disclosed in the prior art:

[0186]

[0187] Preferably, the hole transport layer material and the host organic material in the hole injection layer of the present invention are selected from the same compound.

[0188] The thickness of the hole transport layer of the present invention may be 5-200 nm, preferably 10-150 nm, and more preferably 20-100 nm, but the thickness is not limited to this range.

[0189] In one embodiment of the present invention, the electron blocking layer material of the present invention may be selected from the following compounds disclosed in the prior art:

[0190]

[0191] The thickness of the electron blocking layer of the present invention may be 1-50 nm, preferably 5-40 nm, but the thickness is not limited to this range.

[0192] After forming the hole injection layer, the hole transport layer and the electron blocking layer, a corresponding light emitting layer is formed on the electron blocking layer.

[0193] The light emitting layer may include a host material, a phosphorescent sensitizer, and a boron-containing fluorescent material, wherein the height of the intersection of the emission spectrum of the phosphorescent sensitizer and the absorption spectrum of the boron-containing fluorescent material in the wavelength range of 500 nm to 550 nm is greater than or equal to 0.7.

[0194] The main body material can be a single main body material or a double main body material;

[0195] The dual host material comprises a first host material and a second host material, wherein at least one of the first host material and the second host material is preferably a TADF material;

[0196] TADF materials exhibit thermally activated delayed fluorescence (TADF), characterized by a small energy difference between the first excited singlet and triplet states. This allows for simultaneous utilization of both singlet and triplet excitons within the device, resulting in a near 100% utilization rate of electrically generated excitons within the device. Compared to traditional fluorescent materials, TADF materials exhibit higher exciton utilization.

[0197] Specifically, the emission peak of the boron-containing fluorescent material is between 500 nm and 540 nm, preferably between 515 nm and 535 nm, for example, 515 nm, 520 nm, 525 nm, 530 nm, 535 nm, etc.

[0198] In some embodiments, the emission peak of the boron-containing fluorescent material may be 515 nm to 535 nm, and its emission spectrum is green light. The above-mentioned light-emitting layer is a green light-emitting layer, which can enable the organic electroluminescent device to generate green light.

[0199] Specifically, the boron-containing fluorescent material preferably has a resonance frame with a half-peak width less than 30 nm.

[0200] In the light-emitting layer of the present invention, the ratio of the host material to the phosphorescent sensitizer is 100:1-100:15, and the ratio of the host material to the boron-containing fluorescent material is 100:0.5-100:5, based on mass.

[0201] Preferably, the ratio of the host material to the phosphorescent sensitizer used is 97:3-90:10, and the ratio of the host material to the boron-containing fluorescent material used is 97:0.5-95:5, based on mass.

[0202] The thickness of the light-emitting layer can be adjusted to optimize the luminous efficiency and driving voltage. The preferred thickness range is 5 nm to 50 nm, more preferably 10-50 nm, and more preferably 15-40 nm, but the thickness is not limited to this range.

[0203] In the present invention, the electron transport region may include, from bottom to top, a hole blocking layer, an electron transport layer, and an electron injection layer disposed on the light emitting layer, but is not limited thereto.

[0204] The hole blocking layer is a layer that blocks holes injected from the anode from passing through the light-emitting layer and entering the cathode, thereby extending the life of the device and improving the performance of the device. The hole blocking layer of the present invention can be disposed above the light-emitting layer. As the hole blocking layer material of the organic electroluminescent device of the present invention, compounds with hole blocking properties known in the prior art can be used, for example:

[0205]

[0206] The thickness of the hole blocking layer of the present invention may be 2-200 nm, preferably 5-150 nm, more preferably 5-50 nm, but the thickness is not limited to this range.

[0207] The electron transport layer may be provided on the light-emitting layer or (if present) the hole blocking layer. The electron transport layer material is a material that readily accepts electrons from the cathode and transfers the received electrons to the light-emitting layer. Preferably, the material has a high electron mobility. As the electron transport layer of the organic electroluminescent device of the present invention, the electron transport layer materials disclosed in the prior art for organic electroluminescent devices can be used, for example:

[0208]

[0209]

[0210] In a preferred embodiment of the present invention, the electron transport layer further comprises other compounds conventionally used in electron transport layers, for example, Alq3, Liq, preferably Liq.

[0211] The thickness of the electron transport layer of the present invention may be 10-80 nm, preferably 20-60 nm, and more preferably 25-45 nm, but the thickness is not limited to this range.

[0212] The electron injection layer may be provided above the electron transport layer. The electron injection layer material is generally preferably a material having a low work function, so that electrons are easily injected into the organic functional material layer. As the electron injection layer material of the organic electroluminescent device of the present invention, the electron injection layer materials disclosed in the prior art for organic electroluminescent devices can be used, for example:

[0213]

[0214] The thickness of the electron injection layer of the present invention may be 0.1-5 nm, preferably 0.5-3 nm, and more preferably 0.8-1.5 nm, but the thickness is not limited to this range.

[0215] The second electrode may be disposed above the electron transport region. The second electrode may be a cathode. The second electrode may be a transmissive electrode, a semi-transmissive electrode, or a reflective electrode. When the second electrode is a transmissive electrode, the second electrode may include, for example, Li, Yb, Ca, LiF / Ca, LiF / Al, Al, Mg, BaF2, Ba, Ag, or compounds or mixtures thereof; when the second electrode is a semi-transmissive electrode or a reflective electrode, the second electrode may include, but is not limited to, Ag, Mg, Yb, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF / Ca, LiF / Al, Mo, Ti, or compounds or mixtures thereof. The thickness of the cathode depends on the material used.

[0216] The organic electroluminescent device of the present invention may further include an encapsulation structure. The encapsulation structure may be a protective structure that prevents foreign substances, such as moisture and oxygen, from entering the organic layer of the organic electroluminescent device. The encapsulation structure may be, for example, a can, such as a glass or metal can, or a thin film covering the entire surface of the organic layer.

[0217] The method for preparing an organic electroluminescent device of the present invention comprises sequentially laminating an anode, a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer, and a cathode on a substrate, and optionally a covering layer. In this regard, vacuum deposition, vacuum evaporation, spin coating, casting, LB method, inkjet printing, laser printing, or LITI methods can be used, but are not limited thereto. In the present invention, vacuum evaporation is preferably used to form the various layers. Those skilled in the art can conventionally select the various process conditions in the vacuum evaporation method according to actual needs.

[0218] The organic electroluminescent device of the present invention is further described below through specific examples.

[0219] The height of the intersection of the emission spectrum of the first doped film formed by the phosphorescent sensitizer and the host material and the absorption spectrum of the second doped film formed by the boron-containing fluorescent material and the host material in the wavelength range of 500nm to 550nm after normalization is shown in Table 1-1:

[0220] Table 1-1

[0221]

[0222] Emission spectroscopy: PL spectroscopy: Fluorolog-3 series fluorescence spectrometer (Horiba);

[0223] Absorption spectrum: UV absorption: UV-visible spectrophotometer (TU-1810);

[0224] When the peak value of the absorption spectrum of the second doped film formed by the boron-containing fluorescent material and the host material is less than or equal to the peak value of the emission spectrum of the first doped film formed by the phosphorescent sensitizer and the host material, the intersection value (intersection 1) with a shorter wavelength is used.

[0225] The intersection height of combination 1-6 is shown in the attached Figure 3 As shown: the dotted line represents the normalized UV absorption spectrum of the second doped film formed by the boron-containing fluorescent material and the main material (with the UV absorption peak in the range of 500-550nm as the normalization benchmark), and the solid line represents the emission spectrum of the first doped film formed by the phosphorescent sensitizer and the main material. The height of the intersection 1 is 0.99.

[0226] When the peak of the absorption spectrum of the second doped film formed by the boron-containing fluorescent material and the host material is greater than the peak of the emission spectrum of the first doped film formed by the phosphorescent sensitizer and the host material, the intersection value (intersection 1) closest to the peak.

[0227] The intersection height of combination 1-3 is shown in the attached Figure 4 As shown: the dotted line represents the normalized UV absorption spectrum of the second doped film formed by the boron-containing fluorescent material and the main material (with the UV absorption peak in the range of 500-550nm as the normalization benchmark), and the solid line represents the emission spectrum of the first doped film formed by the phosphorescent sensitizer and the main material. The height of the intersection 1 is 0.97.

[0228] In the following embodiments, the ratio of the shoulder peak height to the main peak height of the emission spectrum of the second doped film formed by the boron-containing fluorescent material and the host material is shown in Table 1-2:

[0229] Table 1-2

[0230]

[0231] The ratio of the shoulder peak height to the main peak height is calculated from the emission spectrum data, and the shoulder peak represents the luminescence peak of the emission spectrum of the second doped film that deviates from the main peak in the range of 480nm to 600nm, as shown in FIG. Figure 2 The compound GD-1 doped film (PH-2: NH-5: GD-1

[0232] =66:33:1) emission spectrum.

[0233] Device Example 1-1

[0234] The device structure of this embodiment is as follows Figure 1 As shown, the preparation method is as follows:

[0235] The transparent substrate layer 1 is a transparent PI film. The ITO anode layer 2 (film thickness 150nm) is washed, i.e., washed with a detergent (Semiclean M-L20), washed with pure water, dried, and then subjected to UV-ozone cleaning to remove organic residues on the transparent ITO surface. On the washed ITO anode layer 2, a 10nm thick layer of HT-1 and HI-1 is deposited using a vacuum evaporation device as the hole injection layer 3. The mass ratio of HT-1 to HI-1 is 97:3. HT-1 is then evaporated to a thickness of 60nm as the hole transport layer 4. EB-1 is then evaporated to a thickness of 30nm as the electron blocking layer 5. After the above-mentioned electron blocking material is evaporated, the light-emitting layer 6 of the organic electroluminescent device is prepared, using PH-2 and NH-5 as the main materials, PD-50 as the phosphorescent sensitizer, and GD-1 as the boron-containing fluorescent material. The mass ratio of PH-2, NH-5, PD-50 and GD-1 is 66.5:30:3:0.5, and the thickness of the light-emitting layer is 30nm. After the above-mentioned light-emitting layer 6, HB-1 is vacuum evaporated to a thickness of 5nm. This layer is the hole blocking layer 7. After the above-mentioned hole blocking layer 7, ET-1 and Liq are vacuum evaporated to a mass ratio of 1:1. The film thickness is 30nm. This layer is the electron transport layer 8. On the electron transport layer 8, a LiF layer with a thickness of 1nm is formed by vacuum evaporation using a vacuum evaporation device. This layer is the electron injection layer 9. On the electron injection layer 9 , a Mg:Ag electrode layer with a thickness of 80 nm was formed by vacuum evaporation equipment. The mass ratio of Mg to Ag was 1:9. This layer was used as the cathode layer 10 .

[0236] The molecular structure formula of the relevant materials is shown below:

[0237]

[0238] Example 1-2 to Example 1-10

[0239] The difference from Example 1-1 is that different first host materials, second host materials, phosphorescent sensitizers and boron-containing fluorescent materials are used in the light-emitting layer, as shown in Table 2 for details.

[0240] Example 2-1, Example 3-1, Example 4-1, Example 5-1

[0241] The only difference from Example 1-1 is that the first host material, the second host material, the phosphorescent sensitizer and the boron-containing fluorescent material in the light-emitting layer are in different proportions, as shown in Table 2 for details.

[0242] Example 2-2, Example 2-3, Example 3-2, Example 3-3, Example 4-2, Example 4-3, Example 5-2, Example 5-3

[0243] The only difference from Example 1-1 is that different first host materials, second host materials, phosphorescent sensitizers and boron-containing fluorescent materials are used in the light-emitting layer, and in different proportions, as shown in Table 2.

[0244] Comparative Example 1

[0245] The difference from Example 1-1 is that the light-emitting layer does not use a boron-containing fluorescent material, as shown in Table 2 for details.

[0246] Comparative Example 2

[0247] The difference from Example 1-1 is that no phosphorescent sensitizer is used in the light-emitting layer, as shown in Table 2 for details.

[0248] Comparative Example 3

[0249] The difference from Example 1-1 is that different first host materials, second host materials, phosphorescent sensitizers and boron-containing fluorescent materials are used in the light-emitting layer, as shown in Table 2 for details.

[0250] After completing the organic electroluminescent device as described above, the anode and cathode were connected using a known drive circuit, and the device's current efficiency and lifetime were measured. Examples and comparative examples of devices prepared using the same method are shown in Table 2; the test results for the current efficiency and lifetime of the resulting devices are shown in Table 3.

[0251] Table 2

[0252]

[0253]

[0254]

[0255]

[0256] Table 3

[0257]

[0258] The current efficiency was measured using an IVL (current-voltage-luminance) test system (Suzhou Fushida Scientific Instrument Co., Ltd.); the lifespan test system was an EAS-62C OLED device lifespan tester from Japan System Giken Co., Ltd.; LT95 refers to the time it takes for the device's brightness to decay to 95%. All data are presented at 10 mA / cm 2 The material and device performance parameters given in the present invention are not limited by the test method.

[0259] Compared with device comparison examples 1, 2 and 3, device embodiments 1-1 to 1-10, device embodiments 2-1 to 2-3, device embodiments 3-1 to 3-3, device embodiments 4-1 to 4-3, and device embodiments 5-1 to 5-3 have an overall greatly improved lifespan. At the same time, device embodiments 1-1 to 1-10, device embodiments 2-1 to 2-3, device embodiments 3-1 to 3-3, device embodiments 4-1 to 4-3, and device embodiments 5-1 to 5-3 show higher efficiency than comparison examples 1, 2 and 3, indicating that the stability of combinations 1-1 to 1-10 is much higher than that of comparison combination 1.

[0260] Compared with device comparison examples 1, 2 and 3, the organic light-emitting device using the light-emitting layer system of the present invention has greatly improved current efficiency and lifespan.

[0261] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An organic electroluminescent device comprising a substrate, a first electrode, an organic functional layer, and a second electrode, wherein the organic functional layer is located between the first electrode and the second electrode, and the organic functional layer comprises at least one light-emitting layer, characterized in that: The light-emitting layer includes a main material, a phosphorescent sensitizer and a boron-containing fluorescent material. The emission spectrum of the first doped film formed by the phosphorescent sensitizer and the main material and the absorption spectrum of the second doped film formed by the boron-containing fluorescent material and the main material have an intersection height of ≥0.7 after normalization within the wavelength range of 500nm to 550nm. The mass ratio of the phosphorescent sensitizer to the main material in the first doped film is 1:99-15:85, and the mass ratio of the boron-containing fluorescent material to the main material in the second doped film is 0.5:99.5-5:

95.

2. The organic electroluminescent device according to claim 1, wherein The height of the intersection between the emission spectrum of the phosphorescent sensitizer and the spectrum of the boron-containing fluorescent material in the absorption wavelength range of 500 nm to 550 nm is ≥0.

8.

3. The organic electroluminescent device according to claim 1, wherein The ratio of the shoulder peak height to the main peak height of the emission spectrum of the second doped film formed by the boron-containing fluorescent material and the host material is ≤0.

3.

4. The organic electroluminescent device according to claim 1, wherein The boron-containing fluorescent material is selected from the structure shown in general formula (1): In the general formula (1), each occurrence of Ar1, Ar2, and Ar3 independently represents a hydrogen atom, a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R, a C3-C10 heterocycloalkyl group substituted or unsubstituted by a substituent R, a C6-C30 aryl group substituted or unsubstituted by a substituent R, or a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R, and Ar1, Ar2, and Ar3 are not simultaneously represented by a hydrogen atom; Ar1, Ar2, and Ar3 can be linked to each other to form a C6-C30 aromatic ring substituted or unsubstituted by a substituent R, a C2-C30 heteroaromatic ring substituted or unsubstituted by a substituent R, or a C6-C10 aliphatic ring substituted or unsubstituted by a substituent R; The substituent R, which is the same or different each time, is represented by one of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'; The substituent R' is selected from one or more of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterated C1-C10 alkyl group, a fluorinated C1-C10 alkyl group, a C3-C10 cycloalkyl group, a deuterated C3-C10 cycloalkyl group, a C6-C30 aryl group, a deuterated C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterated C2-C30 heteroaryl group; The heteroatoms in the heteroaryl group and the heteroaryl ring are selected from one or more of O, S, N, Si and B.

5. The organic electroluminescent device according to claim 4, characterized in that: The boron-containing fluorescent material is selected from any one of the general formulas (1-1) to (1-5): In general formulas (1-1) to (1-5), each occurrence of M1, M2, M3, M4, and M5 independently represents one of a C6-C30 aromatic ring substituted or unsubstituted by a substituent R, a C2-C30 heteroaromatic ring substituted or unsubstituted by a substituent R, and a C6-C10 aliphatic ring substituted or unsubstituted by a substituent R; Each occurrence of X1, X2, X3, and X4 is independently represented by O, S, N (R a )、C(R b )(R c ); X5、X6、X7、X8、X9、X 10 Each occurrence is independently represented as a single bond, O, S, N (R a )、C(R b )(R c ); a, b, c, d are each independently 0 or 1, and a+b+c+d=2; e and f are independently represented as 0 or 1; The R a 、R b 、R c Each occurrence independently represents one of a hydrogen atom, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'; R a 、R b 、R c can be connected to M1, M2, M3 or M4 to form a C6-C30 aromatic ring substituted or unsubstituted by a substituent R, a C2-C30 heteroaromatic ring substituted or unsubstituted by a substituent R, or a C6-C10 aliphatic ring substituted or unsubstituted by a substituent R; The substituent R, which is the same or different each time, is represented by one of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'; The substituent R' is selected from one or more of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterated C1-C10 alkyl group, a fluorinated C1-C10 alkyl group, a C3-C10 cycloalkyl group, a deuterated C3-C10 cycloalkyl group, a C6-C30 aryl group, a deuterated C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterated C2-C30 heteroaryl group; The heteroatoms in the heteroaryl group and the heteroaryl ring are selected from one or more of O, S, N, Si and B.

6. The organic electroluminescent device according to claim 4, characterized in that: The boron-containing fluorescent material is selected from any one of the general formulas (1-6) to (1-12): In general formulas (1-6) to (1-12), each occurrence of Z is identical or different and represents N or C-R1; Each occurrence of R1 is independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', or a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'; Any two adjacent R1s may be connected to form a C6-C30 aromatic ring substituted or unsubstituted by a substituent R, a C2-C30 heteroaromatic ring substituted or unsubstituted by a substituent R, or a C6-C10 aliphatic ring substituted or unsubstituted by a substituent R; Each occurrence of M1, M2, and M3 independently represents one of a C6-C30 aromatic ring substituted or unsubstituted by a substituent R, a C2-C30 heteroaromatic ring substituted or unsubstituted by a substituent R, and a C6-C10 aliphatic ring substituted or unsubstituted by a substituent R; Each occurrence of X1, X2, X3, and X4 is independently represented by O, S, N (R a )、C(R b )(R c ); R a 、R b 、R c Each occurrence independently represents one of a hydrogen atom, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'; R m 、R n Each occurrence independently represents one of a hydrogen atom, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'; R a 、R b 、R c can be connected to M1, M2, M3 or M4 to form a C6-C30 aromatic ring substituted or unsubstituted by a substituent R, a C2-C30 heteroaromatic ring substituted or unsubstituted by a substituent R, or a C6-C10 aliphatic ring substituted or unsubstituted by a substituent R; R a 、R b 、R c Can be connected to adjacent R1 to form C6~C 30 One of an aromatic ring, a C2-C30 heteroaromatic ring substituted or unsubstituted by a substituent R, and a C6-C10 aliphatic ring substituted or unsubstituted by a substituent R; Each occurrence of the substituent R is independently one of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'; The substituent R' is selected from one or more of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterated C1-C10 alkyl group, a fluorinated C1-C10 alkyl group, a C3-C10 cycloalkyl group, a deuterated C3-C10 cycloalkyl group, a C6-C30 aryl group, a deuterated C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterated C2-C30 heteroaryl group; The heteroatoms in the heteroaryl group and the heteroaryl ring are selected from one or more of O, S, N, Si and B.

7. The organic electroluminescent device according to claim 4, characterized in that: The boron-containing fluorescent material is selected from the structure represented by any one of the general formulas (1-13) to (1-18): In general formulas (1-13) to (1-18), each occurrence of Z is identical or different and represents N or C-R1; Each occurrence of R1 is independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', or a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'; Any two adjacent R1s may be connected to form a C6-C30 aromatic ring substituted or unsubstituted by a substituent R, a C2-C30 heteroaromatic ring substituted or unsubstituted by a substituent R, or a C6-C10 aliphatic ring substituted or unsubstituted by a substituent R; Each occurrence of X5, X6, X7, and X8 independently represents a single bond, O, S, N (R a )、C(R b )(R c ); a, b, c, d are each independently 0 or 1, and a+b+c+d=2; R a 、R b 、R c Each occurrence independently represents one of a hydrogen atom, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'; R a 、R b 、R c Can be connected to adjacent R1 to form C6~C 30 One of an aromatic ring, a C2-C30 heteroaromatic ring substituted or unsubstituted by a substituent R, and a C6-C10 aliphatic ring substituted or unsubstituted by a substituent R; Each occurrence of the substituent R is independently one of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'; The substituent R' is selected from one or more of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterated C1-C10 alkyl group, a fluorinated C1-C10 alkyl group, a C3-C10 cycloalkyl group, a deuterated C3-C10 cycloalkyl group, a C6-C30 aryl group, a deuterated C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterated C2-C30 heteroaryl group; The heteroatoms in the heteroaryl group and the heteroaryl ring are selected from one or more of O, S, N, Si and B.

8. The organic electroluminescent device according to claim 1, wherein The host material includes a first host material and a second host material, wherein the first host material is a hole-type host material, and the second host material is an electron-type host material.

9. The organic electroluminescent device according to claim 8, characterized in that: The first host material is selected from the structure shown in general formula (2-1) or general formula (2-2): In the general formula (2-1) and the general formula (2-2), each occurrence of Ring A, Ring B, Ring C, and Ring D independently represents a C6-C30 aryl group which is substituted or unsubstituted by a substituent R', or a C2-C30 heteroaryl group which is substituted or unsubstituted by a substituent R'; Each occurrence of L1, L2, L3, and L4 independently represents a single bond, a C6-C30 arylene group substituted or unsubstituted by a substituent R', or a C2-C30 heteroarylene group substituted or unsubstituted by a substituent R'; Ar1, Ar2, Ar3, and Ar4 each independently represent one of a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C3-C10 heterocycloalkyl group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'; The substituent R' is selected from one or more of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterated C1-C10 alkyl group, a fluorinated C1-C10 alkyl group, a C3-C10 cycloalkyl group, a deuterated C3-C10 cycloalkyl group, a C6-C30 aryl group, a deuterated C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterated C2-C30 heteroaryl group; The heteroatoms in the heteroaryl and heterocycloalkyl groups are selected from one or more of O, S, N, and Si.

10. The organic electroluminescent device according to claim 9, characterized in that: The first host material is selected from the structure shown in general formula (2-3) or general formula (2-4): In the general formula (2-3) and the general formula (2-4), each occurrence of L1, L2, L3, and L4 independently represents a single bond, a C6-C30 arylene group substituted or unsubstituted by a substituent R', or a C2-C30 heteroarylene group substituted or unsubstituted by a substituent R'; Ar1, Ar2, Ar3, and Ar4 each independently represent one of a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C3-C10 heterocycloalkyl group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'; R2, R3, R4, and R5 each independently represent one of a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C3-C10 heterocycloalkyl group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C10 aryloxy group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'; The i, j, p, and q are independently represented by 0, 1, 2, 3, or 4; The substituent R' is selected from one or more of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterated C1-C10 alkyl group, a fluorinated C1-C10 alkyl group, a C3-C10 cycloalkyl group, a deuterated C3-C10 cycloalkyl group, a C6-C30 aryl group, a deuterated C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterated C2-C30 heteroaryl group; The heteroatoms in the heteroaryl and heterocycloalkyl groups are selected from one or more of O, S, N, and Si.

11. The organic electroluminescent device according to claim 10, characterized in that: The first host material is selected from the structures represented by general formula (2-5) to general formula (2-9): In general formulas (2-5) to (2-9), each occurrence of L1, L2, L3, and L4 independently represents a single bond, a C6-C30 arylene group substituted or unsubstituted by a substituent R', or a C2-C30 heteroarylene group substituted or unsubstituted by a substituent R'; Ar1, Ar2, Ar3, and Ar4 each independently represent one of a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C3-C10 heterocycloalkyl group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'; R2, R3, R4, and R5 each independently represent one of a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C3-C10 heterocycloalkyl group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C10 aryloxy group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'; The i, j, p, and q are independently represented by 0, 1, 2, 3, or 4; The substituent R' is selected from one or more of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterated C1-C10 alkyl group, a fluorinated C1-C10 alkyl group, a C3-C10 cycloalkyl group, a deuterated C3-C10 cycloalkyl group, a C6-C30 aryl group, a deuterated C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterated C2-C30 heteroaryl group; The heteroatoms in the heteroaryl and heterocycloalkyl groups are selected from one or more of O, S, N, and Si.

12. The organic electroluminescent device according to claim 8, characterized in that: The second main material is selected from the structure shown in general formula (3): In the general formula (3), Z1 to Z5 are independently N or C-R6; The R6 is represented by a hydrogen atom, a deuterium atom, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a silyl group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C2-C20 alkenyl group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aralkyl group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', or a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'. Any adjacent R6s may be connected to form a C6-C30 aromatic ring substituted or unsubstituted by a substituent R', or a C2-C30 heteroaromatic ring substituted or unsubstituted by a substituent R'. L5, L6, and L7 each independently represent a single bond, a C6-C30 arylene group substituted or unsubstituted by a substituent R', or a C2-C30 heteroarylene group substituted or unsubstituted by a substituent R'; Ar5, Ar6, and Ar7 each independently represent a hydrogen atom, a C3-C10 cycloalkyl group which may be substituted by a substituent R', a C6-C30 aryl group which may be substituted by a substituent R', or a C2-C30 heteroaryl group which may be substituted by a substituent R'; The substituent R' is selected from one or more of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterated C1-C10 alkyl group, a fluorinated C1-C10 alkyl group, a C3-C10 cycloalkyl group, a deuterated C3-C10 cycloalkyl group, a C6-C30 aryl group, a deuterated C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterated C2-C30 heteroaryl group; The heteroatoms in the heteroaryl group are selected from one or more of O, S, N, and Si.

13. The organic electroluminescent device according to claim 12, characterized in that: The second main material is selected from the structure represented by general formula (3-1) or general formula (3-2): In the general formula (3-1) and the general formula (3-2), L5, L6, and L7 each independently represent a single bond, a C6-C30 arylene group substituted or unsubstituted by a substituent R', or a C2-C30 heteroarylene group substituted or unsubstituted by a substituent R'; Ar5, Ar6, and Ar7 each independently represent a hydrogen atom, a C3-C10 cycloalkyl group which may be substituted by a substituent R', a C6-C30 aryl group which may be substituted by a substituent R', or a C2-C30 heteroaryl group which may be substituted by a substituent R'; The substituent R' is selected from one or more of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterated C1-C10 alkyl group, a fluorinated C1-C10 alkyl group, a C3-C10 cycloalkyl group, a deuterated C3-C10 cycloalkyl group, a C6-C30 aryl group, a deuterated C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterated C2-C30 heteroaryl group; The heteroatoms in the heteroaryl group are selected from one or more of O, S, N, and Si.

14. The organic electroluminescent device according to claim 1, characterized in that: The phosphorescence sensitizer is selected from the structure shown in general formula (4): M(L a ) m (L b ) n General formula (4) In the general formula (4), M represents one of Ir and Pt; L a and L b are all ligands, m represents 0, 1, 2, or 3, n represents 0, 1, 2, or 3, and m+n is 3; The L a and L b It can be represented as the following structure: Each occurrence of Z is represented identically or differently as N or C-R1; Each occurrence of R1 is independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', or a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'; Y represents O, S, N (R a )、C(R b )(R c ); R a 、R b 、R c Each occurrence independently represents one of a hydrogen atom, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'; The substituent R' is selected from one or more of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterated C1-C10 alkyl group, a fluorinated C1-C10 alkyl group, a C3-C10 cycloalkyl group, a deuterated C3-C10 cycloalkyl group, a C6-C30 aryl group, a deuterated C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterated C2-C30 heteroaryl group; The heteroatoms in the heteroaryl group are selected from one or more of O, S, N, Si, and P; Preferably, the L a and L b It can be represented as the following structure: R7~R 16 Each occurrence independently represents one of a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'; Y represents O, S, N (R a )、C(R b )(R c ); R a 、R b 、R c Each occurrence independently represents one of a hydrogen atom, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'; The substituent R' is selected from one or more of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterated C1-C10 alkyl group, a fluorinated C1-C10 alkyl group, a C3-C10 cycloalkyl group, a deuterated C3-C10 cycloalkyl group, a C6-C30 aryl group, a deuterated C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterated C2-C30 heteroaryl group; The heteroatoms in the heteroaryl group are selected from one or more of O, S, N, Si, and P.

15. The organic electroluminescent device according to claim 1, characterized in that The phosphorescence sensitizer is selected from the structure represented by any one of the general formulas (5-1) to (5-6): m represents 0, 1, 2, or 3, n represents 0, 1, 2, or 3, and m+n is 3; Each occurrence of Z is represented identically or differently as N or C-R1; Each occurrence of R1 is independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', or a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'; Y represents O, S, N (R a )、C(R b )(R c ); Y1, Y2, Y3, Y4 represent single bonds, O, S, N (R a )、C(R b )(R c ); i, j, p, q are represented as 0 or 1; R a 、R b 、R c Each occurrence independently represents one of a hydrogen atom, a C1-C10 alkyl group substituted or unsubstituted by a substituent R', a C3-C10 cycloalkyl group substituted or unsubstituted by a substituent R', a C2-C10 alkenyl group substituted or unsubstituted by a substituent R', a C2-C10 alkynyl group substituted or unsubstituted by a substituent R', a silanyl group substituted or unsubstituted by a substituent R', a borane group substituted or unsubstituted by a substituent R', a C1-C10 alkoxy group substituted or unsubstituted by a substituent R', a C6-C30 aryloxy group substituted or unsubstituted by a substituent R', an arylamine group substituted or unsubstituted by a substituent R', a C6-C30 aryl group substituted or unsubstituted by a substituent R', and a C2-C30 heteroaryl group substituted or unsubstituted by a substituent R'; The substituent R' is selected from one or more of a deuterium atom, a halogen atom, a cyano group, a C1-C10 alkyl group, a deuterated C1-C10 alkyl group, a fluorinated C1-C10 alkyl group, a C3-C10 cycloalkyl group, a deuterated C3-C10 cycloalkyl group, a C6-C30 aryl group, a deuterated C6-C30 aryl group, a C2-C30 heteroaryl group, and a deuterated C2-C30 heteroaryl group; The heteroatoms in the heteroaryl group are selected from one or more of O, S, N, Si, and P.

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