Stokes and Anti-Stokes emission and biological window III (1.53 µm) luminescence thermometry analysis from Stark sublevels in Er3+, Yb3+ -doped fluorophosphate glasses

The development of efficient temperature sensors has played a pivotal role in technological advancement by offering rapid response and enabling non-contact temperature measurement. In this work, a luminescence thermometer from Stark sublevels of Er 3+ in the biological window III (BWIII) was investigated in Er 3+ , Yb 3+ -doped fluorophosphate glasses, by utilizing the luminescence intensity ratio (LIR) technique. In the range of temperature from 303 k up to 503 K, the results showed that this glass system is a good candidate for an optical thermometer in the near-infrared BWIII with a relative sensitivity of 0.17 % K and good repeatability.