CsPbF 3 Quantum Dots and Sm 3+ Ions Co‐Doped Glasses: Luminescence Characteristics and Temperature Sensing Application

ABSTRACT CsPbF 3 perovskite quantum dots (QDs) and Sm 3+ ions co‐doped glass samples exhibit excellent thermal stability and appropriate attenuation of luminous intensity, demonstrating promising application potential in fluorescence intensity ratio (FIR) temperature sensing. The formation of CsPbF 3 QDs was confirmed using transmission electron microscopy, and the incorporation of Sm 3+ almost did not alter crystal phase of the QDs. For CsPbF 3 ‐Sm 3+ co‐doped samples, with increasing Sm 3+ concentration, the photoluminescence excitation (PLE) spectrum of Sm 3+ includes excitation spectrum component of CsPbF 3 around 310 nm, and the PL intensity of CsPbF 3 and lifetime obviously decrease (compared with CsPbF 3 singly doped sample). These results suggest energy transfer from CsPbF 3 to Sm 3+ . As Sm 3+ concentration increases, the PL intensity of Sm 3+ slightly increases and rapidly decreases, the PL lifetime of Sm 3+ decreases continuously, which are attributed to concentration quenching effect by comparing to Sm 3+ singly doped samples. By using co‐doped sample 4CsPbF 3 ‐0.5Sm, the PL temperature characteristics are evaluated. As the temperature increases, the PL intensity of CsPbF 3 QDs decreases more rapidly than that of Sm 3+ , and the lifetime of CsPbF 3 decreases obviously. Owing to slower PL attenuation rate of CsPbF 3 QDs glass (QDG) than that of CsPbX 3 (X = Cl/Br, Br, I) QDGs, the high temperature limit of FIR sensing is extended to 613.15 K. The lifetime of Sm 3+ is very slightly decreased with elevating temperature, which it is attributed to crossover process. The temperature‐dependent FIR temperature sensing performance and temperature stability/cycling characteristics are evaluated. The results demonstrate the feasibility of employing CsPbF 3 ‐Sm 3+ co‐doped glass samples in temperature sensing applications.