Temperature‐Dependent Color‐Tunable Afterglow in Zirconium‐Doped CsCdCl3 Perovskite for Advanced Anti‐Counterfeiting and Thermal Distribution Detection

Abstract Persistent luminescence (PersL) materials exhibit thermal‐favored optical behavior, enabling their unique applications in security night vision signage, in vivo bioimaging, and optical anti‐counterfeiting. Therefore, developing efficient and color‐tunable PersL materials is significantly crucial in promoting advanced practical use. In this study, hexagonal Zr 4+ ‐doped CsCdCl 3 perovskite is synthesized via a hydrothermal reaction with a tunable photoluminescent (PL) behavior through heterovalent substitution. Moreover, the incorporation of Zr 4+ ions result in an extra blue emission band, originating from the enhanced excitonic recombination in D 3d octahedrons. Furthermore, the afterglow performances of the samples are dramatically improved, along with the noticeable temperature‐dependent PersL as well as the thermo‐luminescence with tunable color output. Detailed analysis reveals that the unique temperature‐dependent PersL and thermo‐luminescence color change are attributed to the presence of multiple luminous centers and abundant traps. Overall, this work facilitates the development of optical intelligence platforms and novel thermal distribution probes with the as‐developed halides perovskite for its superior explored PersL characteristic.