Structural and Optical Studies on Dy3+ Doped Alkali Zinc Fluoroborate Glasses for White Light Stimulation

Abstract

The trivalent Dy3+ ions doped Alkali zinc fluoroborate glasses with the chemical composition (40-x)B2O3+20ZnO+20Na2O+20NaF+xDy2O3 (x = 0.1, 0.3 and 1.0 wt%) were prepared by melt quenching technique. Spectroscopic properties of the prepared glasses were characterized through XRD, FTIR, UV-VIS-NIR absorption spectra and Photoluminescence spectra. The bonding parameters (β and δ) and the oscillator strength were calculated from the absorption spectrum. The negative values of bonding parameters reveal the ionic nature of the prepared glasses. The luminescence spectra exhibit two visible 4F9/2→6H15/2 (Blue) and 4F9/2→6H13/2 (Yellow) transitions. The Judd-Ofelt intensity parameters (Ω2, Ω4, Ω6) were determined from the absorption spectra to investigate the nature of metal-ligand bond and symmetry around the Dy3+ ion site.The radiative properties bandwidth (Δλeff, nm), transition probability (A), branching ratios (βR) and stimulated emission cross-section ( ×10−22 cm2) for the 4F9/2→6H15/2 and 4F9/2→6H13/2 transitions were calculated. The CIE chromaticity co-ordinates were calculated for all glass samples. The emission colors were found to lie in white light region for prepared glasses and thus can be used for bright white LED’s.