Research article published in JACERS
Oxyfluoride transparent glass‐ceramics (GC) containing CaF2 and ZnAl2O4 nanocrystals have been fabricated with melt‐quenching method. By carrying out the heat treatment of the precursor glass (PG), Er3+ and Cr3+ were selectively partitioned into CaF2 and ZnAl2O4 nanocrystals, respectively. The obtained multi‐phase GC exhibited strong upconversion (UC) fluorescence of Er3+ as well as intense down‐conversion (DC) fluorescence of Cr3+. Under 980 nm excitation, the green UC fluorescence of Er3+ due to 2H11/2,4S3/2 → 4I15/2 transition and the red DC fluorescence lifetime of Cr3+ due to 2E, 4T2 → 4A2 transition were found to be highly dependent on the temperature and makes them possibly suitable for Optical Thermometry. With least-square fitting methods, the FIR of Er3+ from thermally coupled energy states (2H11/2 and 4S3/2) produced maximum temperature sensing sensitivity values of 0.33% K−1 at 437 K and 0.36% K−1 at 267 K, respectively. Similarly, fluorescence lifetime of Cr3+ attributed t
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