Tunable Luminescence and Energy Transfer of Eu ³⁺ /Tb ³⁺ Co‐Activated Inorganic Phosphors for Anti‐Counterfeiting and Information Encryption Applications

ABSTRACT Controlling the photoluminescence and tunable luminescent chromaticity properties of inorganic phosphors is crucial for achieving high‐security‐level anti‐counterfeiting and information encryption storage systems, remaining a persistent challenge. In this work, a dual‐emission center construction strategy was used to modify silicate phosphors. The resulting K 7 Tb 3 Si 12 O 32 ·4H 2 O:Eu 3+ ( KTSO:Eu 3+ ) phosphor displays tunable luminescence under different UV wavelength excitations while maintaining high stability. The energy‐transfer process, governed by a multipolar interaction mechanism, proceeds efficiently from the active Tb 3 + host framework to the Eu 3+ ions residing in the structural channels. Furthermore, based on the optical signals of the KTSO:Eu 3+ phosphor, this work designed a series of security identification and information encryption demonstrations for Changchun University of Science and Technology (CUST) and Jilin University (JLU), confirming the broad potential application prospects of these phosphors in the fields of anti‐counterfeiting and information encryption.