The development of organic materials with white-light emission and thermally activated delayed fluo-rescence(TADF)properties in the solid state remain a challenge.Herein,a series of white-light-emitting organic luminogens have been developed and are found to show aggregation-induced delayed fluores-cence(AIDF)characteristics.The AIDF emitters present dual-emission consisted of prompt fluorescence and TADF in the crystalline state.Their white-light emissions can be easily tuned by altering the chemi-cal structure and connecting position of the heterocyclic aromatic substituent.Under the stimuli of me-chanical force and solvent vapor,the compounds exhibit remarkable and reversible mechanochromism,in which their emission colors are switchable between white and yellow.Upon grinding,they also dis-play linearly tunable luminescence colors,as well as force-induced TADF enhancement,which may be associated with the more compact molecular packing and the restriction of intramolecular motions.The results from time-resolved emission scanning and theoretical calculation suggest that the dual-emission of the AIDF luminogens likely results from the twisted intramolecular charge transfer transitions of the molecules,and the reversible mechanochromism properties probably stem from the interconversion of the quasi-axial and the quasi-equatorial conformations.

Key Laboratory of Theoretical Chemistry of Environment,Ministry of Education;School of Chemistry,Sun Yat-sen University,Guangzhou 510275,China;School of Chemistry,South China Normal University,Guangzhou 510006,China;State Key Laboratory of Optoelectronic Materials and Technologies(Sun Yat-sen University),Guangzhou 510275,China

[1]Yitao Zheng;Lingqi Zuo;Letian Zhang;Zihao Huang;Shufeng Li;Zhan Yang;Zhu Mao;Suilian Luo;Cong Liu;Fengqiang Sun;Guang Shi;Zhenguo Chi;Bingjia Xu-.Remarkable mechanochromism and force-induced thermally activated delayed fluorescence enhancement from white-light-emitting organic luminogens with aggregation-induced emission)[J].中国化学快报（英文版）,2022(10):4536-4540

mechanochromism,AIDF

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