Synthesis and properties of undoped and Tb³⁺-doped CsPbF₃ QDs-in-glasses for ultraviolet emitter and optical thermometry

In recent years, all inorganic CsPbX₃ (X = F, Cl, Br, and I) perovskite quantum dots (QDs) have garnered increasing attention for their exceptional optical properties. However, the commercialization of CsPbX₃ is hampered by poor environmental stability and lead toxicity. Fortunately, the strategy of incorporating CsPbX₃ into microcrystalline glass effectively addresses this issue. Notably, CsPbF₃ demonstrates improved phase stability and a unique electronic structure, making its exploration crucial for various applications. In this study, we synthesized CsPbF₃ QDs-in-glass (QiG) and Tb³⁺-doped CsPbF₃ QDs-in-glasses (QiGs) using melt quenching and in-situ growth methods. The CsPbF₃ QiG exhibits intrinsic photoluminescence with the main peak in the ultraviolet range, while Tb³⁺-doped glasses show co-emission of CsPbF₃ QDs and Tb³⁺, allowing tunable colors by adjusting Tb³⁺ content. We systematically studied and evaluated the application of Tb³⁺-doped CsPbF₃ QiG as an optical temperature sensor. Importantly, the glass sample demonstrates high stability, including good thermal stability, superior high-temperature resistance, and moisture stability. This work significantly contributes to the exploration of the optical properties of CsPbF₃ QiG, providing new insights into its future applications in diverse optical-related fields.