As increasing demand for noncontact temperature sensing, the development of a high-performance optical thermometer probe is more and more urgent. In this work, an efficient dual-mode optical thermometry strategy based on the Pr/Dy energy transfer (ET) in some typical double-perovskite oxides is presented, which offers a promising way to design FIR/lifetime dual-mode optical thermometry with excellent temperature-measuring sensitivity and signal discrimination. According to this strategy, double-perovskite LaMgTiO:Pr/Dy phosphors are successfully synthesized. On the basis of diverse thermal responses between Pr and Dy, the FIR of Pr to Dy (four FIR mode) in this material displays outstanding optical thermometry performance from 298 to 548 K. The maximum absolute and relative sensitivities ( and ) of mode 1 are 0.09 and 2.357% K, being better than the current optical temperature measurement materials. For the fluorescence lifetime mode, the and values reach 2.85 × s 10 and 1.814% K. Furthermore, the dual-mode optical thermometry mechanism was presented and studied. It also demonstrated excellent optical thermometry performance in the other Pr/Dy codoped double-perovskite oxides, such as LaMgNbO, NaLa(MoO), NaGd(MoO), and NaLa(WO), proving the universality of the presented strategy. This article presents an effective Pr/Dy ET pathway for developing new and highly sensitive FIR/lifetime dual-mode optical temperature sensing materials.
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