Abstract

${\rm{E}}{{\rm{r}}^{3 +}}/{\rm{Y}}{{\rm{b}}^{3 +}}$-co-doped phosphate glasses with ${\rm{Ge}}{{\rm{O}}_2}$ modification (PLAZGs) were successfully prepared by the melt-quenching method. The phenomenological intensity parameters ${\Omega _t}$ (${{t}} = {{2}}$, 4, 6) of the PLAZGs have been calculated by the Judd–Ofelt theory. Based on the phenomenological intensity parameters, the spectroscopic parameters of ${\rm{E}}{{\rm{r}}^{3 +}}$ and fluorescence intensity ratio (FIR) of green upconversion emissions were estimated. It was observed that, under 980 nm excitation, all samples exhibit green and red upconversion emissions of ${\rm{E}}{{\rm{r}}^{3 +}}$. The 10 mol% ${\rm{Ge}}{{\rm{O}}_2}$ modified phosphate glass has the strongest upconversion emission. Additionally, the fluorescence decays of the ${^2{\rm{F}}_{5/2}}\; \to {{^2}{\rm{F}}_{7/2}}$ transition of ${\rm{Y}}{{\rm{b}}^{3 +}}$ ions were measured to evaluate the energy transfer efficiency from ${\rm{Y}}{{\rm{b}}^{3 +}}$ to ${\rm{E}}{{\rm{r}}^{3 +}}$ ions. Finally, the optical temperature sensing properties based on upconversion emissions were investigated at temperatures from 150 K to 600 K. The maximum absolute temperature sensitivity $S$ value of ${6.0} \times {{1}}{{{0}}^{- 3}}\;{{\rm{K}}^{- 1}}$ at 400 K is obtained, which indicates that the glass is promising for temperature sensing application based on the FIR technology.

© 2020 Optical Society of America

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