Controlling the Balance of Photoluminescence and Photothermal Effect in Cyanostilbene-Based Luminescent Liquid Crystals  

作　　者：Xiang-Jian Cao Wei Li Jiahua Li Lin Zou Xing-Wang Liu Xiang-Kui Ren Zhen-Qiang Yu 

机构地区：[1]School of Chemical Engineering and Technology,State Key Laboratory of Chemical Engineering,Tianjin University,Tianjin 300350,China [2]College of Chemistry and Environmental Engineering,Institute of Low-dimensional Materials Genome Initiative,Shenzhen University,Shenzhen,Guangdong 518071,China

出　　处：《Chinese Journal of Chemistry》2022年第8期902-910,共9页中国化学（英文版）

基　　金：supported bythe National Natural ScienceFoundation of China(Nos.21875143and21875157);the InnovationResearch Foundationof Shenzhen(No.JCYJ20180507182229597);the Natural Science Foundation of Guangdong Province(No.2016-A030312002)and theopen foundation of State Key Laboraatory of Chemical Engineering(No.SKL ChE-20B04).

摘　　要：Molecular motions of the luminescent liquid crystals(LLCs)show a significant effect on fluorescent emission and heat generation.In this article,a series of cyanostilbene-based LLCs(CSs:CS1-6,CS1-12,CS2-6 and CS2-12)are synthesized to investigate how the pho-toluminescence and photothermal effect balanced.Among these materials,the mesogens peripheried by single alkyl chains formed enantiotropic nematic(CS1-6)or smectic C(CS1-12)phase with different alkyl tail lengths.When the single aliphatic chain is re-placed by mini-dendrons,room temperature(RT)monotropic hexagonal columnar phase(CS2-12)or molecular liquid(CS2-6)is formed.The results revealed that all these materials exhibited high efficiency emission with the highest quantum yield reaching 59.0%.The photoluminescence and photothermal effect can be effectively tuned by dispersing CSs into a commercially available RT liquid crystal matrix 8CB,which output significantly improved photothermal conversion efficiency of 63.2%.Furthermore,the pho-tothermal can rapidly trigger the Smectic A-Nematic-Isotropic sequence transitions of 8CB doped with CSs.This work paves a way of adjusting the balance of photoluminescence and photothermal properties of the LLC materials.

关 键 词：Aggregation-induced emission Liquid crystals Molecular motions Photothermal effect Phase transitions 

分 类 号：O62[理学—有机化学]