Dynamic Fluorescence and Multi‐Modal Anti‐Counterfeiting Applications in Pb2+, Mn2+ Co‐Doped CsCdCl3 Perovskite

doping ratio, and the coloration can be rapidly erased through heating or white-light illumination, enabling dual-mode encoding in both bright and dark fields. Furthermore, a time-dependent dynamic fluorescence encoding strategy is developed, and encryption schemes with different decoding approaches are explored. This work presents a novel design strategy for high-security encryption materials featuring multimodal optical responses and dual-mode information storage in both bright and dark fields.