Dy3+-doped nano-glass ceramics comprising NaAlSiO4 and NaY9Si6O26 nanocrystals for white light generation

Highlights: ► Environment safe glass ceramics were fabricated via heat treatment. ► Optical and structural properties were studied before and after heat treatment. ► White light generation with single RE3+ ion-doping was observed under UV excitation. ► Emission color temperature was between fluorescent tube and daylight values. - Abstract: The radiative emission properties of the Dy3+ ions in oxyfluoride glasses and glass ceramics have been investigated for the generation of white light. The X-ray diffraction pattern of the glass ceramics reveals the presence of NaAlSiO4 nanocrystals along with secondary phase of NaY9Si6O26 in the glass matrix after a suitable thermal treatment of the pristine glasses. Intense white light emission has been observed when the samples are excited with 350 nm light. Yellow to blue emission intensity ratios and chromaticity color coordinates have been determined from the visible luminescence spectra. All color coordinates are found to lie in the white region of the chromaticity color diagram proposing the suitability of the present studied materials for color display devices.