Tunable Photoluminescence of LiTaO 3 : Tb 3+ , Sm 3+ for Dynamic Multimode Optical Anti‐Counterfeiting

作者：Baoqing Sun, Ting Li, Congliang Shen, Mingyue Zhang, Zhaoyu Guang · 发表于：Chemistry - A European Journal · 年份：2025 · DOI：10.1002/chem.202500249 · 被引用次数：5 · 研究领域：Nanocluster Synthesis and Applications、Luminescence and Fluorescent Materials、Advanced biosensing and bioanalysis techniques

Abstract Currently, static fluorescent anti‐counterfeiting technology struggles to cope with the increasingly sophisticated counterfeiting techniques, making the dynamic multimode regulation scheme an urgent necessity. Herein, Tb 3+ , Sm 3+ mono‐/co‐doped LiTaO 3 (LTO) phosphors are prepared by high‐temperature solid‐state method. Under 254 nm excitation, the emission chromaticity of LTO: Tb 3+ , Sm 3+ is modulated from green to yellow by increasing Sm 3+ content due to Tb 3+ → Sm 3+ energy transfer. The diverging luminescence thermal stability of LTO: Tb 3+ and LTO: Sm 3+ is uncovered, which is governed by their distinct vacuum‐referenced binding energy (VRBE) levels and charge compensation mechanisms. Based on the time‐domain difference between the trap‐assisted afterglow of Tb 3+ and the photoluminescence of Sm 3+ , a dynamic anti‐counterfeiting pattern that changes from green to orange over time is designed. This work provides a novel material design strategy for time‐resolved color signatures and multi‐modal dynamic optical encryption.