Thermally enhanced photoluminescence and temperature sensing properties of Sc2W3O12:Eu3+ phosphors

Recently,lanthanide-ion-doped luminescent materials have been extensively used as optical thermometry probes due to their fast responses,non-contact,and high sensitivity properties.Based on different responses of two emissions to tem-perature,the fluorescence intensity ratio(FIR)technique can be used to estimate the sensitivities for assessing the optical thermometry performances.In this study,we introduce different doping concentrations of Eu3+ions into negative thermal expansion material Sc2W3O12 to increase the thermal-enhanced luminescence from 373 K to 548 K,and investigate the temperature sensing properties in detail.All samples can exhibit their good luminescence behaviors thermally enhanced.The emission intensity of Sc2W3O12:6-mol％Eu3+phosphor reaches 147.8％of initial intensity at 473 K.As the Eu3+dop-ing concentration increases,the resistance of the sample to thermal quenching decreases.The FIR technique based on each of the transitions 5D→ 7F1(592 nm)and 5D→7F2(613 nm)of Eu3+ions demonstrates a maximum relative temperature sensitivity of 3.063％K-1 at 298 K for Sc2W3O12:6-mol％Eu3+phosphor.The sensitivity of sample decreases with the increase of Eu3+concentration.Benefiting from the thermal-enhanced luminescence performance and good temperature sensing properties,the Sc2W3O12:Eu3+phosphors can be used as optical thermometers.