Mechanically Tunable Circularly Polarized Luminescence of Liquid Crystal‐Templated Chiral Perovskite Quantum Dots

Author:

Zhang Xuan1,Li Lin2,Chen Yuanhao1,Valenzuela Cristian1,Liu Yuan1,Yang Yanzhao1,Feng Yufan1,Wang Ling13ORCID,Feng Wei13

Affiliation:

1. School of Materials Science and Engineering Tianjin University Tianjin 300350 P. R. China

2. School of Materials Science and Engineering, National Institute for Advanced Materials, TKL of Metal and Molecule-Based Material Chemistry Nankai University Tianjin 300350 P. R. China

3. Binhai Industrial Research Institute Tianjin University Tianjin 300452 P. R. China

Abstract

AbstractEndowing perovskite quantum dots (PQDs) with circularly polarized luminescence (CPL) offers great promise for innovative chiroptical applications, but the existing strategies are inefficient in acquiring stimuli‐responsive flexible chiral perovskite films with large, tunable dissymmetry factor (glum) and long‐term stability. Here, we report a strategy for the design and synthesis of luminescent cholesteric liquid crystal elastomer (Lumin‐CLCE) films with mechanically tunable CPL, which is enabled by liquid crystal‐templated chiral self‐assembly and in situ covalent cross‐linking of judiciously designed photopolymerizable CsPbX3 (X=Cl, Br, I) PQD nanomonomers into the elastic polymer networks. The resulting Lumin‐CLCE films showcase circularly polarized structural color in natural light and noticeable CPL with a maximum glum value of up to 1.5 under UV light. The manipulation of CPL intensity and rotation direction is achieved by controlling the self‐assembled helicoidal nanostructure and the handedness of soft helices. A significant breakthrough lies in the achievement of a reversible, mechanically tunable perovskite‐based CPL switch activated by biaxial stretching, which enables flexible, dynamic anti‐counterfeiting labels capable of decrypting preset information in specific polarization states. This work can provide new insights for the development of advanced chiral perovskite materials and their emerging applications in information encryption, flexible 3D displays, and beyond.

Funder

National Natural Science Foundation of China

Science Fund for Distinguished Young Scholars of Tianjin Municipality

National Key Research and Development Program of China

Publisher

Wiley

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