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

Ling Yu; Zhongbin Wu; Guohua Xie; Cheng Zhong; Zece Zhu; Hengjiang Cong; Dongge Ma; Chuluo Yang

doi:10.1039/c6cc05203g

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

Chem Commun (Camb). 2016 Sep 21;52(73):11012-5. doi: 10.1039/c6cc05203g. Epub 2016 Aug 19.

Authors

Ling Yu¹, Zhongbin Wu, Guohua Xie, Cheng Zhong, Zece Zhu, Hengjiang Cong, Dongge Ma, Chuluo Yang

Affiliation

¹ 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.

PMID: 27540606
DOI: 10.1039/c6cc05203g

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.