Dysprosium concentration-dependent fluorescent properties of antimony lead Oxyfluoroborate glasses

Abstract

Different concentrations of dysprosium (Dy3+) ions doped antimony lead oxufluoroborate (SbPbOFB) glasses were synthesized through melt quenching method. These prepared glasses are aimed to study for their utility in photonic device applications such as white Light Emitting Diodes (w-LEDs) and visible lasers. Glassy nature and thermal stability of the undoped SbPbOFB glass was investigated by X-Ray Diffraction (XRD) and Thermal Gravimetry Analysis (TGA) techniques. Spectroscopic features were studied by diverse methods like optical absorption, photoluminescence (PL) excitation, PL emission and PL decay spectra. The Judd-Ofelt (J-O) analysis was used to understand the asymmetry and bonding nature in the as prepared glasses. The emission spectra recorded from 400 to 700 nm show three intense bands in blue (482 nm), yellow (575 nm) and red (663 nm) regions corresponds to the transitions 4F9/2 → 6H15/2, 4F9/2 → 6H13/2 and 4F9/2 → 6H11/2 respectively. Relatively higher values of emission cross-section (σse) along with branching ratio and quantum efficiency obtained for SbPbOFBDy1.0 glass for 4F9/2 → 6 H13/2 transition (yellow band) reveal its ability as potential candidate for visible yellow lasers. The Commission Internationale de I'Elcairage (CIE) color chromaticity coordinates estimated from the PL spectra are in proximity with the traditional white light coordinates (x = 0.333, y = 0.333) and illustrate the ability of the as prepared glasses to fabricate w-LEDs.