Abstract
Temperature-induced redshift of the V-O charge transfer band edge and the temperature quenching effect were combined for designing ratiometric optical thermometry. Following this approach, opposite thermal behaviors of ${{\rm Tm}^{3 +}}$ and ${{\rm Eu}^{3 +}}$ emissions were realized in the range of 300 to 380 K in ${{\rm Tm}^{3 +}}/{{\rm Eu}^{3 +}}$ co-doped ${{\rm YVO}_4}$. Applying the temperature dependent fluorescence intensity ratio of ${{\rm Eu}^{3 +}}$ to ${{\rm Tm}^{3 +}}$ as temperature readout, the maximal relative sensitivity reaches up to ${4.6}\% \;{{\rm K}^{- 1}}$ around 330 K. This result makes our proposed strategy an excellent candidate for developing high-sensitivity optical thermometry.
© 2021 Optical Society of America
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