摘要
Flexible molecules have great potential for constructing multicolor luminescent materials.Understanding the relationship between conformation and luminescence and exploring strategies to regulate emissions are crucial for the development of flexible molecules.In this work,we designed a molecule(HTP)with multiple flexibility and realized its color-tunable emissions via vip regulation.Interestingly,HTP can adjust its conformation and adopt different arrangements with vip water molecules.Two single crystals are obtained,which show green and yellow emissions with HTP:water ratios of 2:1 and 1:1,respectively.Meanwhile,the amorphous sample without water exhibits an orange emission.Notably,the tunable triplet excited state plays an important role in the luminescence of HTP,participating in thermally activated delayed fluorescence(TADF)and room temperature phosphorescence(RTP).Further combining theoretical calculations,the relationship between the multiple flexibility and excited-state energy levels is revealed.Different flexible structures show different dominant effects on the photophysical properties.Moreover,the multicolor and stimulus-responsive luminescence property of HTP is successfully applied in the application of anti-counterfeiting and information encryption.This work demonstrates a paradigm for designing and regulating the molecule with multiple flexibility,which may broaden the understanding of the conformation-luminescence relationship and enlarge the scope of flexible molecules.
基金
supported by the National Natural Science Foundation of China(52303250,52073316)
the Guangdong Basic and Applied Basic Research Foundation(2022B1515020052)。
