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Published on: December 27, 2018
Electron-Rich Twistacene-Modified Arylboron Donor-Acceptor Systems: Synthesis, Photophysics, and Electroluminescence
Pengcheng Jin1, Yanbing Han2, Feng Tian3
1College of Chemistry and Environmental Science, Key Laboratory of Chemical Biology of Hebei Province, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, Hebei University, Baoding, 071002, P.R. China.
Abstract:
A series of twistacene-functionalized donor (D)-π-acceptor (A) derivatives (2-5) have been designed and synthesized, in which twistacene can be regarded as a promising platform for electron-rich systems for fluorescence emitters. The connecting modes and various acceptors are also examined to investigate the effect of structural changes on the photophysical, electrochemical, and thermal properties. The strong electron-withdrawing capability of the arylboron-modified benzonitrile unit can effectively separate the HOMO and LUMO energy levels of 4/5, which is beneficial for the formation of thermally activated delayed fluorescence (TADF) molecules. Cyan and orange organic light-emitting diodes based on 4 and 5 exhibit promising electroluminescence with a maximum brightness of 7643 cd m-2 for device-4 and 14871 cd m-2 for device-5.
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