Reversible switching between normal and thermally activated delayed fluorescence towards “smart” and single compound whitelight luminescence via controllable conformational distribution  

作　　者：Zuozheng He Xinyi Cai Zhiheng Wang Dongjun Chen Yunchuan Li Haobin Zhao Kunkun Liu Yong Cao Shi-Jian Su 

机构地区：[1]State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology

出　　处：《Science China Chemistry》2018年第6期677-686,共10页中国科学（化学英文版）

基　　金：supported by the National Key R&D Program of China (2016YFB0401004);the National Natural Science Foundation of China (51625301, 51573059, 91233116);the National Basic Research Program of China (2015CB655003);Guangdong Provincial Department of Science and Technology (2016B090906003, 2016TX03C175)

摘　　要：An organic compound exhibiting simultaneously reversible switch between its emission colors and luminescence mechanisms,possessing high contrast from deep blue normal fluorescence(NF) to yellow thermally activated delayed fluorescence(TADF),is reported. Based on these two complementary colors, white-light emission combining NF and TADF from a single compound can be achieved in various states. Experimental results and density functional theory calculations indicate that the controllable conformational distribution under thermal and mechanical activation is the mechanism responsible for the reversible switching behavior.An organic compound exhibiting simultaneously reversible switch between its emission colors and luminescence mechanisms,possessing high contrast from deep blue normal fluorescence（NF） to yellow thermally activated delayed fluorescence（TADF）,is reported. Based on these two complementary colors, white-light emission combining NF and TADF from a single compound can be achieved in various states. Experimental results and density functional theory calculations indicate that the controllable conformational distribution under thermal and mechanical activation is the mechanism responsible for the reversible switching behavior.

关 键 词：reversible switching luminescence ＂smart＂ luminescent material white-light emission conformational relaxation 

分 类 号：O644.1[理学—物理化学]