Ce ³⁺ ‐ and Dy ³⁺ ‐Doped Oxyfluoride Borosilicate Glasses with Near White Luminescence

Abstract

A series of Ce 3+ /Dy 3+ ‐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 Ce 3+ ions move to the longer wavelengths with increasing Ce 3+ concentrations and decreasing B 2 O 3 and Al 2 O 3 contents in the glass compositions. We also discover the emission behavior of Ce 3+ 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 Ce 3+ /Dy 3+ codoped glasses is studied. Furthermore, the near‐ideal white light emission (color coordinate x = 0.32, y = 0.32) from the Ce 3+ /Dy 3+ codoped glasses excited at 350 nm UV light is realized.