Ce3+- and Dy3+-Doped Oxyfluoride Borosilicate Glasses with Near White Luminescence

A series of Ce3+/Dy3+-doped oxyfluoride borosilicate glasses prepared by melt-quenching method are investigated for light-emitting diodes applications. These glasses are studied via X-ray diffraction (XRD), optical absorption, photoluminescence (PL), color coordinate, and Fourier transform infrared (FT-IR) spectra. We find that the absorption and emission bands of Ce3+ ions move to the longer wavelengths with increasing Ce3+ concentrations and decreasing B2O3 and Al2O3 contents in the glass compositions. We also discover the emission behavior of Ce3+ ions is dependent on the excitation wavelengths. The glass structure variations with changing glass compositions are examined using the FT-IR spectra. The influence of glass network structure on the luminescence of Ce3+/Dy3+ codoped glasses is studied. Furthermore, the near-ideal white light emission (color coordinate x = 0.32, y = 0.32) from the Ce3+/Dy3+ codoped glasses excited at 350 nm UV light is realized.