Abstract

In this study, a dual-mode optical thermometer is designed based on radiative transitions from Eu³⁺ and Eu²⁺ ions at different K₃YSi₂O₇ lattice sites. In the luminescence-intensity-ratio strategy, a ratiometric signal composed of Eu³⁺:⁵D₀→⁷F₁ and Eu³⁺:⁵D₀→⁷F₂ emissions at 593 and 616 nm, respectively, is employed. Meanwhile, the intensity ratio of the 593-nm emission under O²⁻→Eu³⁺ charge transfer excitation (λ_ex= 249 nm) to that upon Eu²⁺:4f⁷→4f⁶5d¹ excitation (λ_ex= 349 nm) is selected as a thermometric parameter in the single-band-ratio approach. The study findings show that combining the two strategies is conducive to the improvements in sensing-sensitive and anti-interference performance.

© 2022 Optica Publishing Group

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