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Compound, display panel and display device

A display panel and compound technology, which is applied in the fields of compounds, display panels and display devices, can solve the problems that molecules cannot have a large conjugated structure, the thermal stability of luminescent materials is not high, and the free volume is large.

Active Publication Date: 2022-03-08
WUHAN TIANMA MICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The wide energy band (3.0eV) of the blue light material limits the conjugation length of the aromatic compound, the molecule cannot have a large conjugated structure, and the molecular size of the luminescent material cannot be too large, but the small molecular structure will make The thermal stability of the luminescent material is not high;
[0006] (2) A large rigid molecular structure is a necessary condition for obtaining high-efficiency blue light, but it is difficult to obtain a phase-stable film material if the rigid molecular structure is too large;
[0007] (3) The wide energy band makes the simultaneous injection of electrons and holes extremely difficult, which will break the balance of electrons and holes, resulting in a decrease in luminous efficiency
[0010] Although this type of compound with a propeller structure can well avoid quantum quenching caused by agglomeration, its free volume is large, which makes the glass transition temperature of the material drop, and the final thermal stability cannot meet the requirements.

Method used

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  • Compound, display panel and display device
  • Compound, display panel and display device
  • Compound, display panel and display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] Synthesis of compound M1

[0096]

[0097] Add 12.48g (80mmol) of Compound A into a 200mL three-necked flask, add 0.5g of anhydrous aluminum trichloride to Compound A and mix well, and add 3.08g of dry Compound B in portions while stirring at 30-40°C (20mmol), and then continue to stir until the reaction is no longer exothermic, the steam is kept at 70-80°C, and the mixture is refluxed until the hydrogen chloride escapes gently. Add 20mL of 6mol / L hydrochloric acid into benzene, mix evenly, and add the above mixed solution in portions under rapid stirring to carry out hydrolysis reaction, and control the hydrolysis temperature below 40°C. Separate the benzene layer, dilute the water layer with ice water, and extract several times with benzene, combine the extracts, dry with anhydrous calcium chloride, decolorize with activated carbon, filter and cool to crystallize. The crystals were dissolved in a mixed solvent of benzene and petroleum ether with a little chloroace...

Embodiment 2

[0106] Synthesis of compound M6

[0107]

[0108] Add 12.48g (80mmol) of Compound A into a 200mL three-necked flask, add 0.5g of anhydrous aluminum trichloride to Compound A and mix well, and add 3.08g of dry Compound B in portions while stirring at 30-40°C (20mmol), and then continue to stir until the reaction is no longer exothermic, the steam is kept at 70-80°C, and the mixture is refluxed until the hydrogen chloride escapes gently. Add 20mL of 6mol / L hydrochloric acid into benzene, mix evenly, and add the above mixed solution in portions under rapid stirring to carry out hydrolysis reaction, and control the hydrolysis temperature below 40°C. Separate the benzene layer, dilute the water layer with ice water, and extract several times with benzene, combine the extracts, dry with anhydrous calcium chloride, decolorize with activated carbon, filter and cool to crystallize. The crystals were dissolved in a mixed solvent of benzene and petroleum ether with a little chloroace...

Embodiment 3

[0120] Synthesis of Compound M7

[0121]

[0122] Add 12.48g (80mmol) of Compound A into a 200mL three-necked flask, add 0.5g of anhydrous aluminum trichloride to Compound A and mix well, and add 3.08g of dry Compound B in portions while stirring at 30-40°C (20mmol), and then continue to stir until the reaction is no longer exothermic, the steam is kept at 70-80°C, and the mixture is refluxed until the hydrogen chloride escapes gently. Add 20mL of 6mol / L hydrochloric acid into benzene, mix evenly, and add the above mixed solution in portions under rapid stirring to carry out hydrolysis reaction, and control the hydrolysis temperature below 40°C. Separate the benzene layer, dilute the water layer with ice water, and extract several times with benzene, combine the extracts, dry with anhydrous calcium chloride, decolorize with activated carbon, filter and cool to crystallize. The crystals were dissolved in a mixed solvent of benzene and petroleum ether with a little chloroace...

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Abstract

The invention relates to the technical field of OLEDs and provides compounds with TADF properties. The structure of the compound is shown in formula (1), wherein, L 1 and L 2 each independently selected from a hydrogen atom, phenyl, naphthyl, anthracenyl, pyridyl, pyrimidyl, pyrazinyl; R 1 and R 2 Each is independently selected from substituted or unsubstituted carbazolyl and its derivatives, acridinyl and its derivatives, diarylamine and its derivatives, and other aromatic or heteroaryl groups. In the present invention, the bisborane ring structure serves not only as an electron acceptor group, but also as a linking group. In the compound of the present invention, by inserting a large steric hindrance group on the boron atom of the boron heterocycle, the aggregation of compound molecules is avoided, and the direct stacking of conjugated planes to form π aggregation or excimer associations is avoided. Thus, the luminous efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of organic electroluminescent materials, in particular to a compound, a display panel and a display device including the compound. Background technique [0002] The light-emitting materials used in traditional OLEDs mainly include fluorescent materials and phosphorescent materials. Fluorescent materials can only use singlet light emission, which can achieve an internal quantum efficiency of 25%. Phosphorescent materials can simultaneously utilize their singlet and triplet luminescence to achieve 100% internal quantum efficiency. However, the efficiency of phosphorescent materials is severely attenuated, and most of them contain precious metals platinum and iridium, which greatly limits their development. [0003] In recent years, pure organic thermally induced delayed fluorescent materials (TADF) have made up for the shortcomings of phosphorescent and traditional fluorescent materials at the same time. Thi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F5/02C09K11/06H01L51/50H01L51/54H10K99/00
CPCC07F5/027C09K11/06C09K2211/1029C09K2211/1033C09K2211/1037C09K2211/1096C09K2211/1007C09K2211/1014C09K2211/1011H10K85/626H10K85/654H10K85/6572H10K85/657H10K50/11H10K85/658H10K85/615H10K85/631H10K85/342H10K85/40H10K2101/10C09K2211/1022H10K85/322
Inventor 张凯波汪奎叶添昇
Owner WUHAN TIANMA MICRO ELECTRONICS CO LTD