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Unexpected Room-Temperature Phosphorescence/Long Persistent Luminescence Dual Changes Induced by Conformational
Qian He1, Guangming Wang2, Hongxin Gao1
1Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, 21 Gehuzhong Road, Changzhou, 213100, People's Republic of China.
None:
Room-temperature phosphorescence (RTP) and organic long persistent luminescence (OLPL) materials are the current research hotspots in the field of luminescence and have broad application prospects, but afterglow systems with stimulus response or dynamic changes are still rare. Herein, we report unexpected dual afterglow change induced by conformational freezing in difluoroboron β-diketonate (BF2bdk) systems. The cyclized BF2bdk system (after conformational freezing) exhibits bright green RTP followed by weak OLPL, whereas noncyclized BF2bdk system (before conformational freezing) displays blue thermally activated delayed fluorescence (TADF)-type afterglow with subsequent stronger OLPL. In-depth investigations reveal that the inversion in afterglow intensity and mechanism change arise from the difference in ΔEST as well as the ability to undergo charge separation and harvest of excitons. Besides, this dual afterglow changing behavior with brightness inversion over time demonstrates significant potential for advanced dynamic anticounterfeiting and multilevel information encryption applications.
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