Upconversion and Downconversion Luminescence of CaLaLiTeO6:Mn4+/Er3+ Phosphors for Dual-Mode Optical Thermometry and Anti-Counterfeiting Application

作者：Zhengrong Xia, Rongqing Li, Fangfang Liu, Yue Tong, Qing-Hua Zheng, Zhao-Yan Ping, Zhao Wang, Wei‐Wei Zhou, Mingjun Song · 发表于：Inorganics · 年份：2025 · DOI：10.3390/inorganics13090308 · 被引用次数：6 · 研究领域：Luminescence Properties of Advanced Materials、Perovskite Materials and Applications、Optical properties and cooling technologies in crystalline materials

Multifunctional phosphors that integrate optical temperature measurement and counterfeit detection capabilities have garnered considerable interest owing to their diverse application potential. In this study, novel CaLaLiTeO6:Mn4+/Er3+ phosphors were prepared via the high-temperature solid-phase method. The phase structure and morphology characterization confirmed the successful synthesis of CaLaLiTeO6 material with effective doping of Mn4+ and Er3+ into the host lattice. Upon excitation at 379 nm, the CaLaLiTeO6:Mn4+/Er3+ material exhibits far-red emission at 716 nm (Mn4+:2Eg → 4A2g) and green emission at 525/548 nm (Er3+:2H11/2/4S3/2 → 4I15/2). The emission peak intensities of Er3+ and Mn4+ ions in the CaLaLiTeO6:0.015Mn4+/0.01Er3+ sample displayed distinct variations with temperature under different excitation wavelengths (325 nm, 379 nm, and 980 nm). Subsequently, a dual-mode optical temperature sensing system was developed based on the fluorescence intensity ratio and the dual excitation single-band ratiometric method, which achieved a maxed relative sensitivity of 1.12% K−1 at 343 K. Moreover, the excitation-dependent luminescence color changes of CaLaLiTeO6:Mn4+/Er3+ make it particularly suitable for anti-counterfeiting applications. The present study underscores the dual-functional capabilities in sophisticated non-contact optical temperature measurement and anti-counterfeiting applications.