Zou Guo, Li Qihuan, Jiang Zhenhao, Gao Wentong, Cheng Yixiang
State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University Nanjing 210023 P. R. China
School of Materials Science and Engineering, Nanjing Institute of Technology Nanjing 211167 P. R. China.
Chem Sci. 2025 May 13. doi: 10.1039/d5sc02285a.
Developing stimuli-responsive circularly polarized luminescence (CPL) materials that feature fast emission color switching for advanced information encryption presents a scientifically significant yet formidable challenge. Herein, we construct a supramolecular co-assembly system demonstrating transiently responsive CPL emission color switching, enabling mechanically-modulated information encryption. Combining a highly luminescent Pt(II) liquid crystal (Pt8) with the anchored binaphthyl inducers (/-M) forms chiral co-assemblies (/-M)-(Pt8), which assemble into twisted nanobelts (180 °C) and helical nanofibers (260 °C) exhibiting green ( = 545 nm, = 0.038) and red CPL ( = 640 nm, = 0.133), respectively. Notably, mechanical grinding transforms the 180 °C-annealed (/-M)-(Pt8) into nanoparticles, resulting in a fast dynamic switching of CPL emission color from green to orange-red ( : 545 → 625 nm, : 0.038 → 0.058). Reheating the grinding films (/-M)-(Pt8) to 180 °C restores the initial green CPL of the nanobelts. Based on the fast CPL emission color switching, we demonstrate the applications of these supramolecular chiral co-assemblies for mechanically-modulated information encryption.
开发具有快速发射颜色切换功能的刺激响应性圆偏振发光（CPL）材料用于先进的信息加密，是一项具有重大科学意义但极具挑战性的任务。在此，我们构建了一个超分子共组装系统，该系统展示了瞬态响应的CPL发射颜色切换，实现了机械调制的信息加密。将高发光性的Pt（II）液晶（Pt8）与锚定的联萘诱导剂（/-M）结合形成手性共组装体（/-M）-（Pt8），其组装成扭曲纳米带（180°C）和螺旋纳米纤维（260°C），分别呈现绿色（= 545 nm，= 0.038）和红色CPL（= 640 nm，= 0.133）。值得注意的是，机械研磨将180°C退火的（/-M）-（Pt8）转变为纳米颗粒，导致CPL发射颜色从绿色快速动态切换到橙红色（：545 → 625 nm，：0.038 → 0.058）。将研磨后的薄膜（/-M）-（Pt8）重新加热到180°C可恢复纳米带最初的绿色CPL。基于快速的CPL发射颜色切换，我们展示了这些超分子手性共组装体在机械调制信息加密方面的应用。
