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Green thermal activation delayed fluorescence material and synthesis method thereof and electroluminescence device

A technology of thermally activated delayed and fluorescent materials, applied in luminescent materials, electro-solid devices, chemical instruments and methods, etc., can solve the problems of low proportion of thermally activated delayed fluorescent materials, low photoluminescence quantum yield, etc. Effects of high luminescence quantum yield, increased luminous efficiency, high luminous efficiency and brightness

Inactive Publication Date: 2019-02-22
WUHAN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a green light thermally activated delayed fluorescent material and its synthesis method, and an electroluminescent device to solve the problem of low photoluminescence quantum yield in the thermally activated delayed fluorescent material system in the prior art , Technical issues such as the low proportion of thermally activated delayed fluorescent materials in the entire thermally activated delayed fluorescent material system

Method used

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  • Green thermal activation delayed fluorescence material and synthesis method thereof and electroluminescence device
  • Green thermal activation delayed fluorescence material and synthesis method thereof and electroluminescence device
  • Green thermal activation delayed fluorescence material and synthesis method thereof and electroluminescence device

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Embodiment 1

[0031] This embodiment provides a green light thermally activated delayed fluorescent material, which is a target compound synthesized by the reaction of an electron donor and an electron acceptor. The target compound is in the molecular structure of D-A, where D is the electron donor and A is the electron acceptor. . Wherein, the electron acceptor is a planar electron acceptor with an ultra-low triplet energy level, and the triplet energy level range of the target compound is 2.0-3.0 eV. In this embodiment, the molecular structural formula of the electron acceptor is The electron donor is 9,10-dihydro-9,9-dimethylacridine, and the 4-electron acceptor and the 9,10-dihydro-9,9-dimethylacridine undergo a After a series of chemical reactions, the first target compound is synthesized, and the molecular structure of the first target compound is as follows:

[0032] Reduce the difference between the lowest singlet and triplet energy levels of the target molecule, so that the ta...

Embodiment 2

[0061] This embodiment provides a green light thermally activated delayed fluorescent material, which is a target compound synthesized by the reaction of an electron donor and an electron acceptor. The target compound is in the molecular structure of D-A, where D is the electron donor and A is the electron acceptor. . Wherein, the electron acceptor is a planar electron acceptor with an ultra-low triplet energy level, and the triplet energy level range of the target compound is 2.0-3.0 eV. In this embodiment, the molecular structural formula of the electron acceptor is The electron donor is phenoxazine, and the molecular formula of the phenoxazine is C 12 h 9 NO, the 4-electron acceptor and the phenoxazine undergo a series of chemical reactions to synthesize a second target compound, and the molecular structure of the second target compound is as follows:

[0062] Reduce the difference between the lowest singlet and triplet energy levels of the target molecule, so that th...

Embodiment 3

[0090] This embodiment provides a green light thermally activated delayed fluorescent material, which is a target compound synthesized by the reaction of an electron donor and an electron acceptor. The target compound is in the molecular structure of D-A, where D is the electron donor and A is the electron acceptor. . Wherein, the electron acceptor is a planar electron acceptor with an ultra-low triplet energy level, and the triplet energy level range of the target compound is 2.0-3.0 eV. In this embodiment, the molecular structural formula of the electron acceptor is The electron donor is phenothiazine, and the molecular formula of the phenothiazine is C 12 h 9 NS, the 4-electron acceptor and the phenothiazine undergo a series of chemical reactions to synthesize a third target compound, and the molecular structure of the third target compound is as follows:

[0091] Reduce the difference between the lowest singlet and triplet energy levels of the target molecule, so tha...

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Abstract

The invention provides a green thermal activation delayed fluorescence material and a synthesis method thereof and an electroluminescence device. The green thermal activation delayed fluorescence material is a target compound synthesized in reaction of an electron donor and an electron acceptor, and the target compound is of a D-A molecular structure; the electron acceptor is a plane electron acceptor with an ultralow triplet energy level, and a triplet energy level range of the target compound is 2.0-3.0 eV. The synthesis method of the green thermal activation delayed fluorescence material comprises the steps of a reaction liquid preparation step, a target compound synthesis step, an extraction step and a target compound purification treatment step. The electroluminescence device comprises a substrate layer, a hole transporting and injecting layer, a luminescence layer, an electron transporting and a cathode layer. The green thermal activation delayed fluorescence material and the synthesis method thereof and the electroluminescence device have the technical effects that the green thermal activation delayed fluorescence material with high performance is synthesized, the synthesisefficiency is improved, and the high-efficiency organic electroluminescence device is prepared.

Description

technical field [0001] The invention relates to the display field, in particular to a green light thermally activated delayed fluorescent material, a synthesis method thereof, and an electroluminescent device. Background technique [0002] Organic light-emitting diodes (organic light-emitting diodes, OLEDs) do not need a backlight source for their active light emission, high luminous efficiency, large viewing angle, fast response speed, wide temperature range, relatively simple production and processing technology, and low driving voltage. , low energy consumption, lighter and thinner, flexible display and other advantages, as well as huge application prospects, have attracted the attention of many researchers. In OLEDs, the dominant light-emitting guest material is crucial. The luminescent guest materials used in early OLEDs are fluorescent materials. Since the ratio of singlet and triplet excitons in OLEDs is 1:3, the theoretical internal quantum efficiency (IQE) of OLEDs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D401/04C07D413/04C07D417/04C09K11/06H01L51/50H01L51/54
CPCC09K11/06C07D401/04C07D413/04C07D417/04C09K2211/1029C09K2211/1037C09K2211/1033C09K2211/1044H10K85/6572H10K85/657H10K50/11
Inventor 罗佳佳李先杰顾宇黄金昌杨林白亚梅
Owner WUHAN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD
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