Strong Circularly Polarized Luminescence Promoted by AIE-active Chiral Co-assemblies in Liquid Crystal Polymer Films

被引:6
作者
Li, Hang [1 ]
Luo, Jiaxin [1 ]
Liu, Chao [1 ]
Yu, Wenting [1 ]
Cheng, Yixiang [1 ]
机构
[1] Nanjing Univ, Sch Chem & Chem Engn, State Key Lab Analyt Chem Life Sci, Nanjing 210023, Peoples R China
基金
中国国家自然科学基金;
关键词
circularly polarized luminescence; liquid crystal polymers; chiral co-assembly; aggregation-induced emissions; CONJUGATED POLYMERS; ORIENTATION; DERIVATIVES;
D O I
10.1002/chem.202303852
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Recently, extensive works have focused on increasing the dissymmetry factors (glum) of various circularly polarized luminescence (CPL) materials, which is one of the most important factors for future applications of CPL. Herein, we designed a chiral co-assembled liquid crystal polymer (LCP) PTZ@R/S-PB2, which was prepared by chiral binary co-polymer (R/S-PB2) doped with achiral phenothiazine derivation dye (PTZ). For comparison, ternary co-polymerized LCP (R/S-PT) was synthesized by co-polymerizing with mesogenic monomer, chiral monomer and emissive monomer. Both PTZ@R/S-PB2 and R/S-PT showed aggregation-induced emission (AIE) properties. Interestingly, the CPL signals of both PTZ@R/S-PB2 and R/S-PT were reversed and amplified after thermal annealing treatment. The |glum| values of the co-assembled PTZ@R/S-PB2 were up to 0.13 at a 32 nm thickness, which was 5.4 times that of R/S-PT (|glum|=0.024). This is due to PTZ@R/S-PB2 could form more orderly chiral co-assembly structures. Noticeably, increasing the LCP film thickness could further improve the glum value, and the maximum glum of PTZ@R/S-PB2 could be enhanced to +0.91/-0.82 at a 220 nm thickness. A kind of chiral co-assembled liquid crystal polymer (PTZ doped in S-PB2) exhibits reversed and amplified yellow CPL emission (|glum|=0.13) after thermal annealing treatment. This is due to the variation of chiral co-assemblies from spherical aggregates to helical nanofibers. Noticeably, the largest glum value could reach up to +0.91/-0.82 by increasing the film thickness. image
引用
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页数:6
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