Abstract
? 2022 Elsevier B.V.In this work, we synthesized the Sr2InSbO6 (SISO) phosphors with good temperature sensing performances for luminescent thermometry. Both X-ray diffraction and Rietveld refinement results verified that SISO: Sm3+ phosphors have a monoclinic structure with the P21/n space group. Under the charge transfer band excitation, three dominating emission peaks which are attributed to the f-f transition of Sm3+ ions from the 4G5/2 excited level to the 6H5/2, 6H7/2, and 6H9/2 levels, respectively were observed. As the main concentration quenching mechanism was controlled by dipole-dipole (d-d) interaction, the optimum doping concentration in SISO:Sm3+ phosphors was found to be 3%. With the aid of the temperature-dependent fluorescence intensity and lifetime, the maximum relative temperature sensitivities, SR1 and SR2, of SISO:0.03Sm3+ phosphor were 10.9% K?1 and 2.15% K?1 at 523 K, respectively. On the account of these results, single-phase Sr2InSbO6:Sm3+ phosphors with remarkable temperature sensing performances can be applied in dual-mode optical thermometers.
NSTL
Elsevier