Citation: 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]. Chinese Chemical Letters, ;2022, 33(10): 4536-4540. doi: 10.1016/j.cclet.2022.01.059 shu

Remarkable mechanochromism and force-induced thermally activated delayed fluorescence enhancement from white-light-emitting organic luminogens with aggregation-induced emission

Yitao Zheng ^a ,
Lingqi Zuo ^a ,
Letian Zhang ^a ,
Zihao Huang ^a ,
Shufeng Li ^a ,
Zhan Yang ^c ,
Zhu Mao ^d ,
Suilian Luo ^a ,
Cong Liu ^a ,
Fengqiang Sun ^a ,
Guang Shi ^a ,
Zhenguo Chi ^{b, c} ,
Bingjia Xu ^{a, *,}

a.
Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education; School of Chemistry, South China Normal University, Guangzhou 510006, China
b.
State Key Laboratory of Optoelectronic Materials and Technologies (Sun Yat-sen University), Guangzhou 510275, China
c.
School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
d.
Shenzhen Institute of Advanced Electronic Materials, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China

bingjiaxu@m.scnu.edu.cn

Received Date: 18 November 2021
Revised Date: 22 January 2022
Accepted Date: 24 January 2022
Available Online: 31 January 2022

Figures(5)

The development of organic materials with white-light emission and thermally activated delayed fluorescence (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 fluorescence (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 chemical structure and connecting position of the heterocyclic aromatic substituent. Under the stimuli of mechanical 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 display 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.
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