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Currently,lanthanide ions doped luminescence materials applying as opticalthermometers have arose much concern. Basing on the different responses of twoemissions to temperature, the fluorescence intensity ratio (FIR) technique canbe executed and further estimate the sensitivities to assess the opticalthermometry performances. In this study, we introduce different dopingconcentrations of Eu$^{3+}$ ions into negative expansion materialSc$_2$W$_3$O$_{12}$:Eu$^{3+}$, accessing to the thermal enhanced luminescencefrom 373 to 548 K, and investigate the temperature sensing properties indetail. All samples exhibit good thermally enhanced luminescence behavior. Theemission intensity of Sc$_2$W$_3$O$_{12}$: 6 mol% Eu$^{3+}$ phosphors reachesat 147.81% of initial intensity at 473 K. As the Eu doping concentrationincreases, the resistance of the samples to thermal quenching decreases. TheFIR technique based on the transitions 5D0-7F1 (592 nm) and 5D0-7F2 (613 nm) ofEu$^{3+}$ ions demonstrate a maximum relative temperature sensitivity of 3.063%K-1 at 298 K for Sc$_2$W$_3$O$_{12}$:Eu$^{3+}$: 6 mol% Eu$^{3+}$ phosphors. Thesensitivity of sample decreases with the increase of Eu$^{3+}$ concentration.Benefiting from the thermal enhanced luminescence performance and goodtemperature sensing properties, the Sc$_2$W$_3$O$_{12}$:Eu$^{3+}$: Eu$^{3+}$phosphors can be applies as optical thermometers.

Thermally enhanced photoluminescence and temperature sensing properties of Sc$_2$W$_3$O$_{12}$:Eu$^{3+}$ phosphors