Twisted Phosphors that Violate Kasha's Exciton Model in Organic Systems  

作　　者：Boyi Fu Guangming Wang Jiuyang Li Junbo Li Xun Li Xiaoya Zhao Shuhui Ding Guoping Yan Qianqian Yan Kaka Zhang 

机构地区：[1]School of Materials Science and Engineering,Wuhan Institute of Technology,Wuhan,Hubei,430205 China [2]Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules,Shanghai Institute of Organic Chemistry,University of Chinese Academy of Sciences,Chinese Academy of Sciences,345 Lingling Road,Shanghai,200032 China

出　　处：《Chinese Journal of Chemistry》2024年第11期1237-1246,共10页中国化学（英文版）

基　　金：supports from National Natural Science Foundation of China(22175194);Shanghai Scientific and Technological Innovation Project(20QA1411600,20ZR1469200);Hundred Talents Program from Shanghai Institute of Organic Chemistry(Y121078);Pioneer Hundred Talents Program of Chinese Academy of Sciences(E320021),and Ningbo Natural Science Foundation(2023J243).

摘　　要：Kasha's exciton model proposes that T1 energy levels of organic compounds are insensitive to molecular aggregation and microenvironment change because of negligible small transition dipole moments of T1 states.This model holds true in most organic systems till now.Here we report the fabrication of twisted organic phosphors with intramolecular charge transfer characters and flexible molecular structures.When doped into different organic matrices,the twisted phosphor adopts different conformation,exhibits distinct phosphorescence colors and T1 energy levels,which violates Kasha's exciton model in organic system.Given that the change of phosphorescence colors and maxima can be readily distinguished by human eyes and conventional instrument,the twisted phosphors would be exploited as a new type of molecular probe,which would exhibit potential application in optical sensing and stimuli-responsive systems.

关 键 词：AFTERGLOW Twisted phosphor Triplet excited state Room-temperature phosphorescence LUMINESCENCE Spin-orbit coupling 

分 类 号：O61[理学—无机化学]