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Blue light organic electroluminescent material and preparation method thereof

An electroluminescence, electromechanical technology, applied in the fields of luminescent materials, organic chemistry, chemical instruments and methods, etc., can solve the problems of poor electroluminescence performance and difficult preparation of blue polymer, and achieve good device effect and high spectral stability. Effect

Inactive Publication Date: 2020-09-18
朱成杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a blue-light organic electroluminescence material and a preparation method thereof, which solves the technical problem that the existing D-A type light-emitting material is difficult to prepare a blue-light polymer and has poor electroluminescence performance

Method used

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  • Blue light organic electroluminescent material and preparation method thereof
  • Blue light organic electroluminescent material and preparation method thereof
  • Blue light organic electroluminescent material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Dissolve 4,4'-dibromobiphenyl (15.6g, 50mmol) in 150mL of acetic acid, stir under ice bath in the dark, take 30ml of fuming nitric acid and dilute with 50ml of acetic acid, add to the constant pressure dropping funnel, under dark conditions Slowly add dropwise to the reaction solution. After the addition is completed, the reaction temperature is slowly increased to 85°C and refluxed for 2 hours. The change of the reaction solution is observed. The reaction is stopped when the reaction solution turns from turbidity to transparent, and it is naturally cooled to room temperature. The reaction solution was slowly poured into ice water for quenching, the mixed solution was suction filtered, the filter residue was washed with water, saturated sodium bisulfite aqueous solution, water, ice ethanol, and then the filter residue was dried to obtain 4,4'-dibromo-2-nitrate The reaction equation of biphenyl (12.7g, yield 63%) is as follows:

[0018]

Embodiment 2

[0020] 4,4'-Dibromo-2-nitrobiphenyl (14.28g, 40mmol) and triphenylphosphine (26.2g, 100mmol) were dissolved in 250ml of N,N-dimethylacetamide (DMA), argon Heat and stir overnight in an atmosphere. The reaction was stopped and cooled to room temperature, extracted with dichloromethane and washed with water 3-5 times, purified by column chromatography, 200-300 mesh silica gel was used as the stationary phase, and petroleum ether / dichloromethane (2:1) was used as the washing The agent was removed and subjected to silica gel column chromatography, and the crude product was recrystallized from ethanol to obtain 2,7-dibromocarbazole (9.7g, yield 74%). The reaction equation is as follows:

[0021]

Embodiment 3

[0023] Dissolve 2,7-dibromocarbazole (6.5g, 20mmol) in 50ml of N,N-dimethylformamide (DMF), add potassium hydroxide (2.7g, 48mmol), stir at room temperature for 30min, then add 2-(3-Bromophenyl)-5-phenyl-1,3,4-oxadiazole (12.94g, 43mmol), after the addition is complete, continue stirring at 85°C for 10h. After the reaction was completed, the reaction solution was poured into water, and a light yellow solid precipitated. The solid is filtered under reduced pressure and rinsed with distilled water several times, and then drained under reduced pressure to obtain 2-(3-(2,7-dibromo 9H-carbazol-9-yl)phenyl)-5-phenyl -1,3,4-oxadiazole (9.8g, yield 90%), the chemical equation of the reaction is:

[0024]

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Abstract

The invention belongs to the technical field of photoelectric display devices, and particularly relates to a blue light organic electroluminescent material and a preparation method thereof. The invention provides the blue light organic electroluminescent material having the structure represented bythe formula (I). The invention further provides the preparation method of the blue light organic electroluminescent material. The preparation method includes the steps: carrying out a Suzuki coupling reaction on 2,7-dibromo-9,9-dioctyl-9H-fluorene, (2-(9,9-dioctyl-7-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9H-fluoren-2-yl)-4,5,5-trimethyl-1,3,2-dioxaborolan-4-yl)methyl and 3,10-dibromo-14-(3-(5-phenyl-1,3,4-oxadiazol-2-yl)phenyl)-14H-bis(S,S-dioxo-dibenzothiophene)pyrrole to obtain the polymer represented by the formula (I). The invention provides the blue-light organic electroluminescent material and the preparation method thereof, and solves the technical problems that a blue-light polymer is difficult to prepare from an existing D-A type luminescent material and the electroluminescent performance is poor.

Description

Technical field [0001] The invention belongs to the technical field of photoelectric display devices, and specifically relates to a blue organic electroluminescent material and a preparation method thereof. Background technique [0002] With the development of the times and technology, people pursue a better quality of life, and the emergence of various electronic products has greatly enriched people's lives and made people's lives more convenient. The traditional display technology-liquid crystal display (LCD) now seems to be unable to meet the requirements of high-end equipment, while OLED is gradually entering our lives. OLED is a carrier-based injection and synthesis display device driven by an electric field. It has the advantages of light weight, low energy consumption, active light emission, good contrast, adjustable organic material structure, and driving voltage. The organic materials used to make the light-emitting layer of OLED devices can be widely and chemically def...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06C08G61/12C08G61/10C07D495/14C07D519/00
CPCC09K11/06C08G61/12C08G61/10C07D495/14C07D519/00C09K2211/1037C09K2211/1483C09K2211/1048C09K2211/1416C09K2211/1425C09K2211/1007C09K2211/1011C08G2261/411C08G2261/522C08G2261/59C08G2261/1412C08G2261/143C08G2261/142C08G2261/3142C08G2261/3241C08G2261/3243C08G2261/124
Inventor 朱成杰
Owner 朱成杰
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