Luminescence Properties of Oxyfluoride Glass and Glass Ceramic Doped with Y۳ + Ions

 Oxyfluoride glass ceramics containing CaF۲nano-crystals doped with Y۳+ ions were prepared by one-step crystallization of SiO۲- Al۲O۳- CaO- CaF۲ glasses at different temperatures. X- ray diffraction (XRD) results have revealed that CaF۲ was the only precipitated crystalline phase in glass ceramic samples. According to the XRD results, a glass ceramic was selected as the best sample in order to compare its optical properties with basic glass. Photoluminescence (PL) and UV- Vis spectra have been employed to study optical properties of glass and glass ceramic samples. A broad band emission in the visible region was observed, which was stronger in the glassy sample. Scanning electron microscopy (SEM) observation and EDX (Energy-dispersive X-ray spectroscopy) results proved the entrance of Y۳+ ions into only some of the crystals embedded in the glassy matrix, which was the rational reason of photoluminescence intensity decrease in glass ceramic.

کلیدواژه ها:

oxyfluoride glass ceramic ، CaF۲nanocrystals ، yttrium emission ، luminescence