Red‐Green‐Blue Circularly Polarized Luminescence: Ultra‐large Dissymmetry Factors and Handedness Inversion for Information Encryption
Huajun Lei, Xingchen Liu, Wei Liu, Yi Li, Yonggang YangABSTRACT
Materials with circularly polarized luminescence (CPL) are crucial for 3D display, chiral sensing, anti‐counterfeiting, and encryption. However, exploring the CPL‐active system with ultra‐large g lum values remains challenging. In this work, we incorporated highly reflective cholesteric liquid crystal polymer networks (CLCNs) with narrowband emissive perovskites, affording left‐ and right‐handed red‐green‐blue CPL. Benefiting from the effective chiral optical filtering effect of the CLCN film, the resulting stacking‐layered composite films exhibited ultra‐large luminescence dissymmetry factors approaching the theoretical limit (| g lum | values: 1.96∼1.99). Using a patterned half‐waveplate, the CPL handedness was successfully inverted, enabling colorful pattern encryption and decryption in both reflection and CPL mode. This work not only develops an intensive CPL‐active system with controlled handedness, but also provides a feasible approach for practical display and information encryption.