Structure and luminescence of Dy3+ doped CaO–B2O3–SiO2 glasses

The present work reports structure and luminescence of Dy3+ doped CaO–B2O3–SiO2 glasses prepared by melt quenching technique. The presence of various stretching and bending vibrations of different borate and silicate groups were identified from FTIR spectral measurements. The optical absorption and luminescence spectra were also measured, and their emission spectra exhibit two intense emission bands at around 485 nm (blue) and 577 nm (yellow) corresponds to 4F9/2→6H15/2 and 4F9/2→6H13/2 transitions, respectively. The emission spectra were characterized through CIE 1931 color chromaticity diagram to explore its suitability for W-LED applications. Furthermore, the proper Y2O3 could change local structure of glass, which makes the UV absorption edge shift to longer wavelength, and it's easier to transfer energy from host to Dy3+ and then enhance the emission of Dy3+.