Abstract
Tm3+-doped Na0.5-xYb0.5+xF2+2x glass ceramics were successfully synthesized by glass self-crystallization route, which were determined by X-ray diffraction, transmission electron microscopy, selected area electron diffraction, Stark splitting of emission spectra and prolonged lifetime. With subsequent heat treatment, up-conversion luminescence of Tm3+ was obviously enhanced owing to improving crystallinity of Na0.5-xYb0.5+xF2+2x nanocrystals. The temperature sensing behavior of Na0.5-xYb0.5+xF2+2x:Tm3+ glass ceramics was investigated within the 303–543 K temperature range through fluorescence intensity ratio between F2,32→H63 and G41→F43 up-conversion emission of Tm3+ excited upon 980 nm laser. The maximum relative sensitivity reaches 1.44% K-1 at 418 K, suggesting that Na0.5-xYb0.5+xF2+2x:Tm3+ glass ceramics can be used as an excellent materials for temperature sensors.
Published Version
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