title: Achieving a balance between small singlet-triplet energy splitting and high fluorescence radiative rate in a quinoxaline-based orange-red thermally activated delayed fluorescence emitter.
abstract: A new orange-red thermally activated delayed fluorescence (TADF) emitter is designed and synthesized by incorporating a fluorine-substituted quinoxaline as an electron-acceptor and a phenoxazine as an electron-donor. The rational molecular design enables small singlet-triplet energy splitting (ΔEST) and high fluorescence radiative rate (k) for long-wavelength TADF emitters. The organic light emitting diodes (OLEDs) employing the new TADF emitter achieve maximum external quantum efficiencies (EQEs) of 13.9% and 9.0% for the vacuum- and solution-processed OLEDs, respectively.
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Department of Chemistry, Wuhan University, Wuhan, 430072, People's Republic of China. clyang@whu.edu.cn.
authors.forename: Ling
authors.initials: L
authors.lastname: Yu
authors.forename: Zhongbin
authors.initials: Z
authors.lastname: Wu
authors.forename: Guohua
authors.initials: G
authors.lastname: Xie
authors.forename: Cheng
authors.initials: C
authors.lastname: Zhong
authors.forename: Zece
authors.initials: Z
authors.lastname: Zhu
authors.forename: Hengjiang
authors.initials: H
authors.lastname: Cong
authors.forename: Dongge
authors.initials: D
authors.lastname: Ma
authors.forename: Chuluo
authors.initials: C
authors.lastname: Yang