Er <sup>3+</sup> /Yb <sup>3+</sup> co‐doped oxyfluoro tellurite glasses: Analysis of optical temperature sensing based on up‐conversion luminescence
D. Rajesh, Róbert Klement, Dušan Galusek
Abstract
Abstract The effect of Yb 3+ co‐doping on relaxation dynamics of excited states of Er 3+ ion in oxyfluoro tellurite (TZYN) glasses was demonstrated employing excitation and luminescence spectroscopy. The up‐conversion luminescence spectra were studied as a function of temperature in the 298–633 K range, and fluorescence intensity ratio (FIR) for green bands due to the 2 H 11/2 → 4 I 15/2 and 4 S 3/2 → 4 I 15/2 transitions of Er 3+ ion against temperature was determined. The temperature sensing performance of TZYN:Er 3+ /Yb 3+ glasses was studied using the FIR technique up to 633 K. The maximum absolute ( S a ) and relative ( S r ) sensitivity of 0.00246 K −1 at 413 K and 0.72% K −1 at 323 K, respectively, were determined for TZYN:0.5Er 3+ /1.0 Yb 3+ glass.