Transparent perovskite glass-ceramics for visual optical thermometry

Optical thermometers have aroused considerable attention in recent years, and the increasing demand of sensitivity for practical application encourages the investigation on developing innovative non-contact optical thermometric materials with higher sensitivity and accuracy. Perovskite quantum dots (QDs) with excellent temperature-dependence optical properties, provide a feasible approach to realizing the detection of temperature change, however, their poor high temperature thermal stability and the facile realization to obtain the production remain a daunting challenge. Herein, growing Tb3+-doped CsPbI3 QDs in situ in borosilicate glass is proposed, which ensures the phase stability, and high-efficiency florescence output of the all-inorganic perovskite as a temperature sensor. A higher absolute and relative temperature sensitivity (0.0398 K–1 and 7.12%/K, respectively), along with the visible color change from orange-red to yellow-green with the increase of temperature is accomplished. Notably, the repeatable florescence intensity of Tb3+-doped CsPbI3 QDs under high temperature enables their temperature sensing application.