Enhanced circularly polarized luminescence emission promoted by achiral dichroic oligomers of F8BT in cholesteric liquid crystal  

作　　者：Yang Li Yihan Chen Jiaxin Luo Qihuan Li Yiwu Quan Yixiang Cheng 

机构地区：[1]State Key Laboratory of Analytical Chemistry for Life Science,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210023,China [2]Key Laboratory of High Performance Polymer Material and Technology of Ministry of Education,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210023,China [3]Wenzhou Institute,University of Chinese Academy of Sciences,Wenzhou 325001,China

出　　处：《Chinese Chemical Letters》2024年第11期470-474,共5页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.21975118,92156014,52373188)。

摘　　要：In the exploration of circularly polarized luminescence(CPL)materials,doping cholesteric liquid crystals(CLCs)with achiral dyes is a common strategy.Conjugated polymers are favored as achiral dyes for their superior luminescent properties.In this study,a series of oligomers(M1-M3)and the conjugated polymer F8BT were synthesized to systematically assess the impact of the length of the conjugated backbone on CPL signals of CLCs doped with conjugated polymers.As the length rose from M1 to M3,CPL intensity concurrently increased(|g_(lum)|increased from 0.35 to 0.84),attributable to enhanced dichroism(order parameter,SFincreased from 0.20 to 0.56).In contrast,F8BT polymer resulted in diminished CPL intensity(|g_(lum)|=0.64)due to the reduced compatibility.Achieving a balance between dichroism and compatibility is crucial for optimizing CPL in conjugated polymer-doped CLCs.The guiding principle established here may have broad applicability in other CPL assemblies,offering a strategic avenue to engineer highperformance CPL materials with conjugated polymer.

关 键 词：Circularly polarized luminescence Cholesteric liquid crystal F8BT DICHROISM Compatibility 

分 类 号：O753.2[理学—晶体学]