Original Ultra-stable Tb3+: CsPbI3 nanocrystal glasses for wide-range high-sensitivity optical temperature sensing

In this work, a series of perovskite nanocrystals glasses with different concentrations of Tb3+ doped CsPbI3, which have excellent characteristics in terms of water resistance and cyclic thermal stability, were prepared by melt quenching and in situ crystallization methods. With the introduction of Tb3+, the photoluminescence quantum yield of CsPbI3 was greatly improved. Considering that the two fluorescence peaks of Tb3+ and CsPbI3 at different positions respond differently to temperature stimuli, we studied the potential application of those glasses as optical temperature detection tools in the temperature range of 80-480 K. More importantly, the results showed higher sensitivity than other tools, with the maximum absolute and relative temperature sensitivities reaching as high as 0.034 K-1 and 1.78 % K-1, respectively. This work is expected to provide an effective method for the application of CsPbX3 in high-performance optical temperature sensing materials.