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

The glass samples with composition (30 SiO2-5 TeO2-1.0 Dy2O3-(65-x) B2O3-xBi(2)O(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 H-6(9/2) (7911 cm(-1)) at 1256 nm. The emission spectra showed two intense emission bands around 480 nm and 575 nm corresponding to the F-4(9/2) -> H-6(15/2) and F-4(9/2) -> H-6(13/2) transition. PL intensity decreases with increasing the Bi2O3 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 Bi2O3 content.

Automated summary

Glass samples with varying composition were prepared and analyzed for absorption and emission spectra, revealing a decrease in PL intensity with increasing Bi2O3 content, while all fundamental parameters closely matched the standard values for high Bi2O3 content glass samples.