Inconsistency Between Photoluminescence and Persistent Luminescence in Sb 3+ /Mn 2+ Co‐Doped Cs 3 Cd 2 Cl 7

Abstract Persistent luminescence (PersL) materials have garnered significant attention in applications such as emergency signage, anti‐counterfeiting, and bioimaging. However, most inorganic PersL materials exhibit identical photoluminescence (PL) and PersL spectra. While organic materials can achieve PL‐PersL inconsistency, their short‐lived PersL times severely restrict practical implementation. This study reveals that Cs 3 Cd 2 Cl 7 :1%Sb 3+ ,1%Mn 2+ emits cyan PL and orange PersL, featuring a PersL time surpassing 3600 s. The discrepancy between the PL and PersL can be attributed to their different luminescent pathways. For PL, the primary pathway involves electronic relaxation from the excited state of Sb 3+ to self‐trapped state, followed by radiative transition to the ground state. In contrast, PersL mainly involves the electrons released from traps migration to the conduction band, then to the Cl − ‐Mn 2+ charge transfer band, where they are transferred to the 4 T 1 energy level of Mn 2+ , followed by a radiative transition back to the 6 A 1 energy level. Finally, based on the unique PL‐PersL inconsistency characteristic of Cs 3 Cd 2 Cl 7 :Sb 3+ ,Mn 2+ , this study demonstrates its application in dynamic anti‐counterfeiting and multi‐dimensional information encryption. This work provides a new strategy for developing ultra‐long PersL materials with PL‐PersL inconsistency.