Abstract

To explore new upconversion (UC) luminescent materials for optical temperature sensing, a series of ${\mathrm{Ba}}_3{\mathrm{La}}_{1-x}{({\mathrm{PO}}_4)}_3\text{:}0.1{\mathrm{Yb}}^{3+},{x\mathrm{Er}}^{3+}$ (abbreviated as $\mathrm{BLP}\text{:}0.1{\mathrm{Yb}}^{3+}$, ${x\mathrm{Er}}^{3+}$, $0.01\le x\le 0.03$) and ${\mathrm{Ba}}_3{\mathrm{La}}_{1-y}{({\mathrm{PO}}_4)}_3\text{:}0.1{\mathrm{Yb}}^{3+},{\mathrm{yTm}}^{3+}$ (abbreviated as $\mathrm{BLP}\text{:}0.1{\mathrm{Yb}}^{3+}$, ${\mathrm{yTm}}^{3+}$, $0.005\le y\le 0.015$) phosphors was designed. For ${\mathrm{Yb}}^{3+}-{\mathrm{Er}}^{3+}$ codoped BLP, the UC emission spectra exhibit a gradual enhancement with increasing pump power, and two-photon process for the green and red emissions of ${\mathrm{Er}}^{3+}$ has been confirmed by studying the dependence of UC emission intensities on excitation power. When the temperature rises, the fluorescence intensity ratio (FIR) for the ${}^2{\mathrm{H}}_{11/2}{-}^4{\mathrm{I}}_{15/2}$ and ${}^4{\mathrm{S}}_{3/2}{-}^4{\mathrm{I}}_{15/2}$ emissions of ${\mathrm{Er}}^{3+}$ increases gradually due to the thermalization of populations at the ${}^2{\mathrm{H}}_{11/2}$ and ${}^4{\mathrm{S}}_{3/2}$ levels. With the temperature increased, the absolute sensitivity (${\mathrm{S}}_A$) shows a continuous increase and reaches about $4.38\times {10}^{-3}{\mathrm{K}}^{-1}$ at 498 K, but the relative sensitivity (${\mathrm{S}}_R$) decreases gradually. For ${\mathrm{Yb}}^{3+}-{\mathrm{Tm}}^{3+}$ codoped BLP, the emission intensity of ${\mathrm{Tm}}^{3+}$ shows a gradual decrease with increasing ${\mathrm{Tm}}^{3+}$ concentration. By studying the temperature dependence of FIR for the $({}^3{\mathrm{F}}_2,{}^3{\mathrm{F}}_3)-{}^3{\mathrm{H}}_6$ and ${}^3{\mathrm{H}}_4{-}^3{\mathrm{H}}_6$ emissions, it has been found the sample exhibits a higher ${\mathrm{S}}_R$ value but a lower ${\mathrm{S}}_A$ value relative to the ${\mathrm{Yb}}^{3+}-{\mathrm{Er}}^{3+}$ codoped BLP.

© 2018 Optical Society of America

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