Fine regulation of charge recombination for multi-color persistent luminescence

作     者：Ping Jiang Bingbing Ding Tao Li Chao Wang Ziyi Wang Wenbin Liu Xiang Ma 

作者机构：Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic Chemistry School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai Key Laboratory of Crime Scene Evidence Shanghai Research Institute of Criminal Science and Technology 

出 版 物：《Science China Chemistry》 (中国科学:化学(英文版))

年 卷 期：2025年第68卷第6期

页      面：2533-2540页

核心收录：

学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Key Research and Development Program of China (2022YFB3203500) the National Natural Science Foundation of China (22125803, T2488302, 22020102006, 22205062) the Science and Technology Commission of Shanghai Municipality (24DX1400200) the Guangxi Department of Science and Technology (AA23062016) the Fundamental Research Funds for the Central Universities 

主　　题：room-temperature phosphorescence long persistent luminescence exciplex energy transfer charge transfer state afterglow 

摘      要：Pure organic room-temperature phosphorescence（RTP） has drawn broad attention due to its long persistent luminescence and large Stokes shift. Although the doping strategy has become one of the most effective methods to construct organic RTP systems,there is still some fuzziness of impurities, mechanisms and luminescence regulation. This study develops a series of doping RTP systems based on exciplex, in which BPC@PPZ(where BPC is N-（4-bromophenyl）-carbazole, PPZ is 10-phenyl-10H-phenothiazine) achieved the highest quantum yield of 36.3%, while BPC@CE（where CE is coronene） showed the longest lifetime of 628.5 ms. The relevant data verify the mechanism that RTP comes from the charge transfer（CT） state of exciplex. Further, the introduction of Nile Red into the exciplex system results in the triple-singlet F?rster resonance energy transfer, exhibiting a red delayed fluorescence. Besides, when incorporating the coumarin derivatives into doping system, distinct1CT*&3CT*states are generated through the CT process, accompanying a brand-new long persistent luminescence excited by visible light. These findings present an approach to regulate the CT state for achieving different persistent luminescence in the multicomponent system.