Conjugated Derivatives and Their Applications as Electroluminescent Materials

Abstract

The invention relates to a tetrabenzotriphenyl organic light-emitting material which can be used in an organic electroluminescent device structure; the series of derivatives take tetrabenzotriphenyl compounds as a basis; a molecular conjugated system is increased by introducing a substituent, the charge mobility of the tetrabenzotriphenyl derivatives is improved, and thus the electron transport ability of the whole compounds is improved. The compounds form a certain distortion degree in a three-dimensional space, the film forming property of the compounds can be improved, the molecular weight is increased, the glass transition temperature of the compounds is facilitated to be increased, at the same time, the molecular planarity is also decreased, and vacuum evaporation film forming is facilitated. By optimizing reaction conditions, a reaction solvent is changed into a common solvent, operation is convenient, purification is easy, the yield is greatly increased, and the cost is reduced; the compounds prepared by the method have relatively high light-emitting efficiency, the light-emitting efficiency in a dilute solution is about 98%, the light-emitting efficiency in a thin film can reach about 63%, and the compounds have relatively good prospects in the application of organic light-emitting devices.

Description

technical field [0001] The invention belongs to the field of organic optoelectronic materials, and particularly relates to a tetrabenzotriphenyl organic light-emitting material and a preparation method and application thereof. Background technique [0002] Organic electroluminescence (hereinafter referred to as OLED) and the corresponding research began as early as the 1960s. In 1963, P. Pope et al. first discovered the electroluminescence phenomenon of organic single crystal anthracene, but due to the limitation of technical conditions, its driving voltage was as high as 400V, which failed to attract widespread attention. In 1987, C.W.Tang et al. of Kodak Company in the United States used vapor deposition Alq 3 And HTM-2 made an amorphous film device, the driving voltage was reduced to less than 20v, OLED only attracted the attention of the world (US4356429). Due to their high brightness, wide viewing angle, fast photoelectric response, low voltage, low power consumption,...

AI Technical Summary

Problems solved by technology

[0003] Compared with green organic electroluminescent devices, blue organic electroluminescent devices cannot fully meet the requirements of full-color display

At present, blue-light organic light-emitting materials are mainly concentrated in some classic compound systems such as triarylamine systems, anthracene derivatives, carbazole derivatives, and metal complexes. However, these existing blue-light organic light-emitting materials are still facing difficulties in application, such as The life, brightness, and efficiency are low, which cannot meet the needs of industrialization; moreover, the synthesis methods of these materials are complicated, the purification is difficult, and relatively toxic raw materials are used in the synthesis process

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