Boron-based compound and application thereof in organic electroluminescent device

Abstract

The invention relates to a boron-based compound and application thereof in an organic electroluminescent device, and belongs to the technical field of photoelectric materials. According to the compound, dibenzo six-membered heterocycle is in nitrogen bond connection with dibenzo six-membered heterocycle groups such as carbazole or acridine and phenazine to form a main body, the center of the main body is subjected to boryl modification, and through mutual cooperation of the rigid large-conjugate main body and boryl of a weak receptor, the excited-state vibration relaxation of compound molecules is reduced, and the radiation transition rate of current carriers is increased; the substitution of phenyl, tert-butyl and other substituent groups on a host reduces the annihilation or quenching of intermolecular excitons, and a device prepared by using the compound as a light-emitting layer guest material is significantly improved in the aspects of light-emitting efficiency and service life.

Description

technical field [0001] The invention relates to the field of photoelectric materials, in particular, the invention relates to a boron-based compound and its application in organic electroluminescent devices. Background technique [0002] Compared with liquid crystal display (LCD), organic light emitting diode (OLED) has the advantages of self-illumination, wide viewing angle, high response speed, thinness, low temperature resistance, flexible display and double transparent display, etc., and has bright industrial prospects. In the process of OLED, the performance of the light-emitting material directly affects the efficiency and life of the device, which has become an important factor affecting the rapid development of OLED. [0003] In recent years, new π-conjugated organic unit materials containing organic boron and nitrogen co-intercalated have become a research hotspot in blue OLED material systems due to their good photophysical and electrochemical properties. However,...

AI Technical Summary

Problems solved by technology

However, due to the wide bandgap of blue light materials, the carrier transport and energy transfer process in the electroluminescence process become difficult and unstable, especially at high current densities, the singlet-triplet annihilation (STA ), triplet-triplet annihilation (TTA), triplet-polaron annihilation (TPQ) and non-radiative attenuation caused by vibrational relaxation of excited state molecules, etc., will make the device efficiency roll-off very serious

So far, there is no organic boron semiconductor luminescent material whose performance can meet the industrial needs in the field of blue light

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