Li Shan, Tang Yuqi, Fan Qingyan, Li Ziyuan, Zhang Xinfang, Wang Jingxia, Guo Jinbao, Li Quan
Key Laboratory of Carbon Fibers and Functional Polymers, Ministry of Education, and College of Materials Science and Engineering, Beijing University of Chemical Technology, 100029, Beijing, China.
Institute of Advanced Materials and School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China.
Light Sci Appl. 2024 Jun 14;13(1):140. doi: 10.1038/s41377-024-01479-1.
Polymer-based circularly polarized luminescence (CPL) materials with the advantage of diversified structure, easy fabrication, high thermal stability, and tunable properties have garnered considerable attention. However, adequate and precise tuning over CPL in polymer-based materials remains challenging due to the difficulty in regulating chiral structures. Herein, visualized full-color CPL is achieved by doping red, green, and blue quantum dots (QDs) into reconfigurable blue phase liquid crystal elastomers (BPLCEs). In contrast to the CPL signal observed in cholesteric liquid crystal elastomers (CLCEs), the chiral 3D cubic superstructure of BPLCEs induces an opposite CPL signal. Notably, this effect is entirely independent of photonic bandgaps (PBGs) and results in a high g value, even without matching between PBGs and the emission bands of QDs. Meanwhile, the lattice structure of the BPLCEs can be reversibly switched via mechanical stretching force, inducing on-off switching of the CPL signals, and these variations can be further fixed using dynamic disulfide bonds in the BPLCEs. Moreover, the smart polymer-based CPL systems using the BPLCEs for anti-counterfeiting and information encryption have been demonstrated, suggesting the great potential of the BPLCEs-based CPL active materials.
具有结构多样、易于制备、高热稳定性和可调性质等优点的聚合物基圆偏振发光（CPL）材料已引起了广泛关注。然而，由于难以调控手性结构，对聚合物基材料中的CPL进行充分且精确的调控仍然具有挑战性。在此，通过将红色、绿色和蓝色量子点（QD）掺杂到可重构的蓝相液晶弹性体（BPLCE）中实现了可视化全色CPL。与胆甾相液晶弹性体（CLCE）中观察到的CPL信号相反，BPLCE的手性三维立方超结构诱导出相反的CPL信号。值得注意的是，这种效应完全独立于光子带隙（PBG），即使在PBG与QD的发射带不匹配的情况下也能产生高g值。同时，BPLCE的晶格结构可通过机械拉伸力进行可逆切换，从而诱导CPL信号的开-关切换，并且这些变化可以利用BPLCE中的动态二硫键进一步固定。此外，已经展示了使用BPLCE的基于智能聚合物的CPL系统用于防伪和信息加密，这表明基于BPLCE的CPL活性材料具有巨大潜力。
