Generation of white light on Dy³⁺-ions activated Zinc fluoroborate glasses and luminescence studies

Trivalent dysprosium doped zinc fluoroborate glasses, with a chemical composition of (45-x)B₂O₃-25ZnF₂-15K₂CO₃-15LiF-xDy₂O₃ (where x = 0.25, 0.5, and 1.0 wt%), were synthesized using the conventional melt quenching method. These glasses were subjected to characterization through FTIR, optical absorption, excitation, and emission measurements. Utilizing the Judd–Ofelt (JO) theory, optical absorption spectra were analysed to derive JO intensity parameters. A higher value of Ω₂ indicates increased asymmetry around the Dy³⁺ ions in the studied glasses. Analysis of luminescence spectra revealed that the radiative properties, such as stimulated emission cross-section ( \(\:{\sigma\:}_{P}^{E}\) ), branching ratio (β_R) and radiative lifetime for the ⁴F_9/2→⁶H_13/2 transition, were higher in the prepared glasses, comparable to other reported Dy³⁺-doped glasses. Additionally, the CIE 1931 chromaticity diagram was employed to determine the color coordinates (x, y) and correlated color temperature (CCT) of the glasses under study. The obtained x and y values fell within the white light region, indicating the potential for white light emission in these glasses.