A Dual-Mode Optical Thermometer with High Sensitivity Based on BaAlO:Sm/SrAlO:Sm Solid Solution Phosphors.

A series of BaAlO:Sm/SrAlO:Sm mixed-phase phosphors were produced in one step using the traditional high-temperature solid-phase process. Because Sm is divalent in BaAlO and trivalent in SrAlO, the coexistence of Sm and Sm is realized in the mixed-phase host. Since the temperature sensitivity of Sm and Sm in the solid solution host is significantly different, this makes it possible for the sample to measure temperature based on the fluorescence intensity ratio (FIR).