Self-calibrating temperature sensing strategy based on KBaY(MoO₄)₃:Pr³⁺ phosphor luminescence characteristics with...

Non-contact temperature sensors have gained immense popularity due to their inherent benefits, including the absence of physical interaction with targets and rapid response characteristics. In this work, KBaY(MoO₄)₃:Pr³⁺ was successfully synthesized utilizing a high-temperature solid-phase method. Experimental studies have indicated that multi-phonon relaxation (MPR), cross-relaxation (CR), and the unique intervalence charge transfer state (IVCT) exhibited by Pr³⁺-Mo⁶⁺ contribute to the changes in luminescence properties. The characteristic emission peaks of Pr³⁺ were utilized for fluorescence intensity ratios (FIR), and their fluorescence temperature sensing properties were explored with the temperature range of 292-513 K, and the maximum absolute sensitivity and maximum relative sensitivity were finally realized as 4.987 % K^-1 at 513 K and 1.700 % K^-1 at 513 K respectively. Moreover, KBaY_0.99(MoO₄)₃:0.01Pr³⁺ maintained a high stability with a maximum repeatability of 0.984 after multiple cycling tests, the thermal resolution also achieved 0.29 K. The multiple FIRs also achieved superior levels of temperature resolution in all cases. These results demonstrate that KBaY_1-x(MoO₄)₃:xPr³⁺ materials have a great potential for application in fluorescence temperature sensing.