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Blue fluorescent material and preparation method thereof

A blue fluorescent and precursor technology, applied in the field of blue fluorescent materials and their preparation, can solve the problems of poor thermal stability of blue fluorescent materials, and achieve the effect of reducing non-radiative deactivation and improving thermal stability

Inactive Publication Date: 2018-02-27
王歧燕
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a blue fluorescent material with high thermal stability and a preparation method thereof for the problem of poor thermal stability of the blue fluorescent material

Method used

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  • Blue fluorescent material and preparation method thereof
  • Blue fluorescent material and preparation method thereof
  • Blue fluorescent material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0027] A method for preparing a blue light fluorescent material, comprising the following steps:

[0028] S1. Synthesis of precursor I: In a mixed solution containing potassium carbonate and toluene, add 4-cyanophenylboronic acid, 1,4-dibromobenzene, tetrakis(triphenylphosphine)palladium, and then heat at 80°C Reflux reaction for 27 hours, after extraction and purification, the solid 4-bromo-4'-cyanobiphenyl was collected to obtain the precursor I; wherein the 4-cyanophenylboronic acid, 1,4-dibromobenzene , The molar ratio of tetrakis(triphenylphosphine)palladium is 41:46:0.2.

[0029] S2. Synthesis of precursor II: In anhydrous 1,4-dioxane solution, add precursor I, bis(pinacolate) diboron, potassium acetate and 1,1'-bis(diphenyl Phosphine) ferrocene dichloride palladium dichloromethane complex, heated to reflux at 80°C for 25 hours, purified by extraction, collected solid 4'-cyano-[1,1'-biphenyl]-4- Borate ester, that is, to obtain precursor II; wherein, in molar ratio, th...

Embodiment 2

[0033] A method for preparing a blue light fluorescent material, comprising the following steps:

[0034] S1. Synthesis of precursor I: In a mixed solution containing potassium carbonate and toluene, add 4-cyanophenylboronic acid, 1,4-dibromobenzene, tetrakis(triphenylphosphine)palladium, and then heat at 75°C Reflux reaction for 24 hours, after extraction and purification, the solid 4-bromo-4'-cyanobiphenyl was collected to obtain the precursor I; wherein the 4-cyanophenylboronic acid, 1,4-dibromobenzene , The molar ratio of tetrakis(triphenylphosphine)palladium is 40:45:0.2.

[0035] S2. Synthesis of precursor II: In anhydrous 1,4-dioxane solution, add precursor I, bis(pinacolate) diboron, potassium acetate and 1,1'-bis(diphenyl Phosphine) ferrocene dichloride palladium dichloromethane complex, heated to reflux at 88°C for 22 hours, purified by extraction, collected solid 4'-cyano-[1,1'-biphenyl]-4- Borate ester, that is, to obtain precursor II; wherein, in molar ratio, th...

Embodiment 3

[0039] A method for preparing a blue light fluorescent material, comprising the following steps:

[0040] S1. Synthesis of precursor I: In a mixed solution containing potassium carbonate and toluene, add 4-cyanophenylboronic acid, 1,4-dibromobenzene, tetrakis(triphenylphosphine)palladium, and then heat at 85°C Refluxing reaction for 30 hours, after extraction and purification, solid 4-bromo-4'-cyanobiphenyl was collected to obtain precursor I; wherein the 4-cyanophenylboronic acid, 1,4-dibromobenzene , The molar ratio of tetrakis(triphenylphosphine)palladium is 42:47:0.3.

[0041] S2. Synthesis of precursor II: In anhydrous 1,4-dioxane solution, add precursor I, bis(pinacolate) diboron, potassium acetate and 1,1'-bis(diphenyl Phosphine) ferrocene dichloride palladium dichloromethane complex, heated and refluxed at 95°C for 28 hours, purified by extraction, collected solid 4'-cyano-[1,1'-biphenyl]-4- Borate ester, that is, to obtain precursor II; wherein, in molar ratio, the ...

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Abstract

The invention provides a blue fluorescent material and a preparation method thereof. The blue fluorescent material is an organic material, 4'-(8-(4-diphenylamino)phenyl)naphthalene-1-yl)-[1,1'-biphenyl]-4-formonitrile, and has a molecular formula of C43H28N2. The preparation method comprises the following steps: with 4-cyanobiphenyl as an electron acceptor and 4-triphenylamine acid as an electrondonor, carrying out a chemical reaction under catalysis of tetrakis(triphenylphosphine)palladium, thereby obtaining the blue fluorescent material. According to the blue fluorescent material disclosedby the invention, a certain dihedral angle is formed between 4-cyanobiphenyl and 4-triphenylamine acid, so that HOMO and LUMO can realize cross conjugation. Under optical excitation of 320nm, the maximum emission peak is 500nm, and the material emits blue-green light. Meanwhile, the fluorescent material disclosed by the invention has excellent heat stability, and the decomposition temperature is 381 DEG C. The blue fluorescent material disclosed by the invention has excellent heat stability and blue fluorescence emission property and has potential application prospects while serving as a fluorescent material.

Description

【Technical field】 [0001] The invention relates to the technical field of organic luminescent materials, in particular to a blue fluorescent material and a preparation method thereof. 【Background technique】 [0002] Organic light-emitting diodes (OLEDs) have attracted great attention due to their great potential for applications in flat panel displays and general lighting. In order to realize the white light display of OLED, the development of three primary color fluorescent materials is very important. Compared with the green and red light materials, the development of blue fluorescent materials is progressing slowly. In recent years, thermally induced delayed fluorescence (TADF) materials have become an important means for scientists to expand blue fluorescent materials due to their high internal quantum efficiency, good stability, and low cost. [0003] In order to design effective blue TADF materials, the material molecules should simultaneously meet the following three ...

Claims

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Application Information

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IPC IPC(8): C09K11/06C07C253/30C07C255/58
CPCC09K11/06C07C255/58C09K2211/1007C09K2211/1011
Inventor 王歧燕
Owner 王歧燕
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