Customizing thermometry: Optimizing the operating temperature range of phase transition-based ratiometric luminescence thermometers

Phase transition-based thermometers, which are widely known for their remarkable sensitivity to temperature changes, exhibit a narrow temperature range owing to the stoichiometry of the host material. This limits the applicability of optical sensors utilizing structural phase transitions. In this study, we introduce a co-doping method for modulating the properties of phase transition-based luminescent thermometers to influence the phase transition temperature. We demonstrate that by adjusting the ionic radius of the dopant and its concentration, the transition temperature can be finely tuned across a broad temperature spectrum. The proposed technique enables the customization of luminescent thermometers with enhanced sensitivities and practical temperature ranges tailored to specific user requirements. This study represents a crucial advancement towards the development of personalized luminescence thermometers.