Abstract

In comparison to conventional thermometers, optical thermometry has gained worldwide interest due to its unique characteristics including high sensitivity, low cost and easy to perform. Herein, a tri-mode optical thermometer is prepared in Mn4+/Eu3+ co-doped double perovskite Sr2CaTeO6 (SCT) for the first time. The phosphor SCT:Mn4+/Eu3+ exhibits two independent emitting bands at 676 nm and 594 nm, with independent thermal quenching mechanisms. Temperature-dependent PL spectra of SCT:0.017Mn4+/0.04Eu3+ were recorded at temperatures ranging from 298–573 K to analyse the fluorescence intensity ratio (FIR)-based temperature sensing properties. At 298 K, the optimal relative sensitivity (Sr) of SCT:0.017Mn4+/0.04Eu3+ is 1.53 % K−1 using 466 nm excitation, and the maximum Sr can reach to be 3.21 % K−1 at 298 K when using 260 nm light as excitation source. Moreover, SCT:0.017Mn4+/0.04Eu3+ has the other modes of temperature sensing based on dual excitation bands and lifetime. Besides, SCT:0.017Mn4+/0.04Eu3+ can be used for optical wavelength sensing the FIR of Mn4+ and Eu3+ with the maximum relative sensitivity at 275 nm is about 10.56 % nm−1. The tri-mode temperature sensing and wavelength detection properties of SCT:0.017Mn4+/0.04Eu3+ make it an extremely sensitive sensing material, which can serve as a model for future researchers.

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