Boosting the thermometric performance of the Nd3+, Er3+-based luminescence thermometers by sensitization via Cr3+ ions: the role of the host material

The sensitization of the luminescence of lanthanide ions (Ln3+) through codoping with Cr3+ ions enables an increase in the sensitivity of Ln3+-based luminescent thermometers, as well as a significant enhancement of their luminescence intensity. However, achieving predictable thermometric performance in such thermometers necessitates an understanding of the correlation between the host material and thermometric parameters. In this study, we demonstrate the dependence of the relative sensitivity enhancement and thermal quenching temperature on the strength of the crystal field interacting with Cr3+ ions. The versatility of the presented research enables the development of a tool that allows the design of optical temperature sensors with predefined parameters.