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Amplified Circularly Polarized Luminescence Behavior in Chiral Co-assembled Liquid Crystal Polymer Films via the Strategic Manipulation of Chiral Inducers.

Benfa ChuFeiyang SongPeng WangYi-Xiang ChengZhongxing Geng
Published in: ACS applied materials & interfaces (2024)
One of the most important factors for the future application of circularly polarized luminescence (CPL) materials is their high dissymmetry factors ( g em ), and more and more studies are working tirelessly to focus on increasing the g em value. Herein, we chose an achiral liquid crystal polymer (LC-P) and two chiral binaphthyl-based inducers ( R / S -3 and R / S -6) with different substitution positions (3,3' positions for R / S -3 and 6,6' positions for R / S -6) to construct chiral co-assemblies and explored their induced amplification CPL behaviors. Interestingly, after the thermal annealing treatment, this kind of chiral co-assembly ( R / S -3) 0.05 -(LC-P) 0.95 can emit a superior CPL signal (| g em | = 0.31 and λ em = 424 nm), which achieves about 13-fold signal amplification in the spin-coated film, compared to ( R / S -6) 0.1 -(LC-P) 0.9 (| g em | = 0.023 and λ em = 424 nm). This is because ( R / S -3) 0.05 -(LC-P) 0.95 could further co-assemble to form a more ordered arrangement LC state and generate regular helix nanofibers than that of ( R / S -6) 0.1 -(LC-P) 0.9 . This work provides an efficient method for synthesizing high-quality CPL-active materials through the strategic manipulation of the structure of chiral binaphthyl-based inducers in chiral co-assembled LCP systems.
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