Optical temperature sensor with superior sensitivity based on Ca2LaSbO6: Mn4+, Eu3+ phosphor

Optical temperature sensors based on photoluminescence materials have received considerable attention because of their noncontact measurement. However, such sensors still suffer from low sensitivity. Herein, A rationmetric optical temperature sensor with high sensitivity based on the spectra of Ca2LaSbO6: Mn4+, Eu3+ (CLS: Mn4+, Eu3+) phosphors was constructed. The temperature-dependent spectra were studied ranging from 273 to 473 K. Results showed that the fluorescence intensity of Mn4+ ions attenuated faster than that of Eu3+ ions with the increase of temperature because of their different thermal responses. Moreover, the sensing properties of CLS: Mn4+, Eu3+ showed absolute sensitivity and relative sensitivity of 0.098 K−1 and 2.60% K−1, respectively, based on the fluorescence intensity ratio of Mn4+ and Eu3+. Therefore, CLS: Mn4+, Eu3+ phosphor can be used for optical thermometry with high performance.