摘要
Multiresonance(MR)emitters featuring narrowband emissions and theoretically 100%exciton harvesting are great potential for organic light-emitting diode(OLED)applications.However,how to functionalize MR molecules without scarifying emission color purity is still a key challenge.Herein,we report a feasible strategy for selective optimization of MR molecules,which is demonstrated by a blue MR emitter tCBNDASPO substituted with a diphenylphosphine oxide(DPPO)group.Compared to its DPPO-free parent molecule,tCBNDASPO preserves narrowband feature with full widths at half maximum(FWHM)values of 28 nm in film and 32 nm in OLEDs and achieves 40%increased photoluminescence(92%)and electroluminescence quantum efficiencies(28%).It is showed that insulation effect of P=O effectively confines the singlet excited state on MR core to keep emission color purity,and its induction effect enhances singlet radiation and triplet-to-singlet conversion.This synergism for selective optimization is based on rational linkage between MR core and functional groups.
出处
《Research》
EI
CAS
CSCD
2022年第4期15-24,共10页
研究（英文）
基金
This project was financially supported by the National Natural Science Foundation of China(92061205,62175060,51873056,61905070,and 22005088)
the National Postdoctoral Program for Innovative Talents(BX20180092)
the Young Innovative Team Supporting Projects of Heilongjiang Province,and the National Science Fund for Excellent Young Scholars of Heilongjiang Province(YQ2020B006).
