Abstract
Optical, structural and morphological properties of Tm3+/Yb3+ co-doped NaYF4-based nano-glass-ceramic and a precursor glass have been investigated. The controlled heat-treatment of multicomponent oxyfluoride glass at 640 °C for 2 h was used to obtain crystalline precipitations. The differences in optical characteristics have been discussed analysing spectra recorded within wide VUV–VIS–NIR spectral range and considering relaxation dynamic of involved excited states. Optical spectra and luminescence decay curves were measured as a function of temperature in the range of 295–725 K. Based on up-converted emission spectra excited at 975 nm, temperature sensing properties of glass-ceramic were verified. The fluorescence intensity ratio between the up-converted emission bands located at around 795 nm (Tm3+:3H4–3H6) and 695 nm (Tm3+:3F3,2–3H6) was studied. The maximum relative temperature sensitivity was determined to be 0.35% K−1 at 445 K.
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