Realizing dual-mode luminescent thermometry with excellent sensing sensitivity in single-phase samarium (III)-doped antimonite phosphors

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 P2(1)/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 (4)G(5/2) excited level to the H-6(5/2), H-6(7/2), and H-6(9/2) 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, S-R1 and S-R2, of SISO:0.03Sm(3+) 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. (C) 2022 Elsevier B.V. All rights reserved.

Automated summary

This study synthesized Sr2InSbO6 phosphors with good temperature sensing performances and found that the optimal doping concentration was 3%, resulting in significant temperature sensitivities.