Abstract
Alumino tungsten borate (AlWB) glasses doped with dysprosium ions are prepared by melt-quenching method and characterized using spectroscopic techniques such as optical absorption, photoluminescence (PL), and decay spectral studies to comprehend the importance in photonic devices, visible solid state lasers, and other applications. The amorphous nature of the as-prepared glasses were confirmed by XRD studies. The oscillator strengths are measured by using absorption spectra are intern used to evaluate the Judd-Ofelt (Ω2, Ω4, and Ω6) parameters. The PL spectra of the as-prepared glasses manifested three significant emission bands at 483 nm (blue), 575 nm (yellow) and 664 nm (red), and their corresponding electronic transitions are identified from 4F9/2 to 6H15/2,6H13/2 and 6H11/2 respectively. Various radiative parameters such as branch ratio (βR), transition probability (AR), radiative lifetime (τR), effective bandwidth (Δλp), and stimulated emission cross-section (σse) have been calculated. The CIE Chromaticity coordinates evaluated from the emission spectra of Dy-doped AlWB glasses reveal white light emission. Quantum efficiency values are evaluated by correlating the radiative lifetime with the experimental lifetime values measured from the PL decay spectral features. The data acquired from the as-prepared glasses allows us to contemplate that, the titled glasses are suitable to fabricate photonic devices. such as white LED’s and lasers.
Published Version
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