Er3+/Yb3+ co-doped lead germanate glasses for up-conversion luminescence temperature sensors.

Er 3+ /Yb 3+ co-doped lead germanate glasses have been examined for up-conversion luminescence temperature sensors. Up-conversion luminescence spectra corresponding to 2 H 11/2 → 4 I 15/2 and 4 S 3/2 → 4 I 15/2 transitions of Er 3+ are changed with temperature. The fluorescence intensity ratio (FIR) and temperature sensitivity were determined. The maximum sensitivity is found to be 70 × 10 −4 K −1 at T = 550 K in the temperature range of 300–600 K. It suggests that Er 3+ /Yb 3+ co-doped lead germanate glass is promising for optical temperature sensors. [ABSTRACT FROM AUTHOR]