Luminescence Properties of Oxyfluoride Glass and Glass-ceramic Doped with Y^3+ Ions

Oxyfluoride glass- ceramics containing caf2 nano- crystals doped with y3+ ions were prepared by onestep crystallization of sio2- al2o3- cao- caf2 glasses at different temperatures. x-ray diffraction (xrd) results have revealed that caf2 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 are utilized to check optical properties of glass and glass- ceramic samples. a broad emission band in the visible region was determined, which was stronger in the glassy sample. scanning electron microscopy (sem) observation and edx (energy-dispersive x-ray spectroscopy) results establish the doorway of y^3+ ions into just some of the crystals embedded in the glassy matrix, that was the rational reason of photoluminescence intensity decrease in glass-ceramic.