Abstract

Temperature-induced redshift of the V-O charge transfer band (CTB) is promising for designing high performance optical thermometry. The shift mechanism is considered as the thermal populations of high vibrational energy levels of the VO₄³⁻ ground state. Direct experimental evidence for this, however, is still lacking. In this work, Tm³⁺-doped YVO₄ with various doping concentrations was studied to achieve strong ¹D₂ emission of Tm³⁺. The temperature dependent CTB was studied at low temperatures to give direct evidence experimentally for the shift mechanism of the CTB using YVO₄:20% Tm³⁺. It was found that the V-O CTB does not shift when the temperature is lower than a certain temperature (60 K), verifying the proposed shift mechanism experimentally. In addition, based on the temperature quenching of ¹D₂ emission of Tm³⁺ and the redshift of the CTB, single-excitation ratiometric thermometry was carried out using YVO₄:30% Tm³⁺,6% Sm³⁺. High relative sensitivity was achieved with a maximal value reaching up to 3.86% K⁻¹ at approximately 355 K.

© 2022 Optica Publishing Group

Ratiometric optical thermometry based on temperature-induced shift of V-O charge transfer band edge

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