Impact of bismuth concentration on the fluorescence properties of the bismuth borosilicate glasses

摘要

The glass samples with composition (30 SiO_2-5 TeO_2-1.0 Dy_2O_3-(65-x) B_2O_3-xBi_2O_3) where x = 5, 15, 25, 35, 45 and 50 mol% were prepared by melt quenching method. The glassy state was confirmed by the X-ray diffraction. Fourier transformation infrared, physical properties (density, ion concentration, molar volume, Polaron radius, inter-nuclear distance, refractive index, optical bandgap) absorption spectra, excitation, and emission spectra have been analyzed. The absorption spectrum shows five bands with a hypersensitive transition corresponding to ~6H_(9/2) (7911 cm~1) at 1256 am. The emission spectra showed two intense emission bands around 480 nm and 575 nm corresponding to the ~4F_(9/2)→~6H_(15/2) and ~4F_(9/2)→~6H_(13/2) transition. PL intensity decreases with increasing the Bi_2O_3 content. All values of the fundamental parameters (The color coordinates, Y/B ratio, and color rendering index (CRI)) are very close to the standard value for the glass samples with high Bi_2O_3 content.