Abstract
Oxyfluoride glass with Na5Y9F32:Ce3+/Dy3+ nanocrystals were fabricated via a conventional melt-quenching route. The characterization results showed that Na5Y9F32 nanocrystals with particle sizes (40–75 nm) were successfully formed, and homogeneously dispersed in the glass matrix. Color tunable emission can be realized via varying the Dy3+ concentration. Energy transfer from Ce3+ to Dy3+ ions was confirmed by the fluorescence spectra and the decay curve measurement. The dependence of fluorescence intensity ratio (FIR) on temperature were evaluated from the emission spectra, demonstrating that glass ceramics (GCs) can achieve high sensitivity (1.025% K-1). All these properties indicate that the developed Na5Y9F32:Ce3+/Dy3+ GCs could be an ideal material in color tunable luminescence and temperature sensors.
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