Antithermal Quenching and Multiparametric Temperature Sensing from Mn2+/Tb3+‐Codoped Ca2LaTaO6 Phosphor

Luminescence thermometry plays significant roles in various fields including industrial production, environmental detection, aerospace, and medicine. However, its accuracy improvement remains highly challenging due to the thermal quenching effect of phosphors. Herein, for the first time, a thermal‐activated electron compensation Mn 2+ ‐ and Tb 3+ ‐codoped Ca 2 LaTaO 6 phosphor is developed for multiparametric temperature sensing with tunable emission of Mn 2+ and antithermal quenching emission of Tb 3+ , leading to excellent accuracy at high temperatures. By virtue of the deep electron trap states induced by Mn 2+ dopant, the electrons in the deep trap can be thermally activated at high temperatures, which can replenish the attenuated Tb 3+ emission caused by thermal quenching, thus bringing out the antithermal quenching phenomenon. On account of the prominent emission properties, the luminescence intensity ratio (LIR) readout and lifetime‐based thermometry are designed, providing a maximum relative sensitivity S R of 3.603% and 1.941% K −1 , respectively. Multiparametric temperature sensing and novel data analysis are also employed to further improve the accuracy of the luminescence thermometer. The outstanding relative thermal sensitivity ranging from 8.72% to 16.11% K −1 and temperature uncertainty order of 10 −3 are achieved. These results demonstrate that the designed Ca 2 LaTaO 6 :Mn 2+ /Tb 3+ phosphor material is a promising thermal‐sensing candidate.