Abstract
Dy3+-doped magnesium zinc sulfophosphate glasses with composition of (60−x)P2O5–20MgO–20ZnSO4–xDy2O3 (x=0.0, 0.5, 1.0, 1.5 and 2.0mol%) were synthesized using melt-quenching technique and characterized via emission and absorption measurements. The UV–Vis-NIR absorption spectra in the wavelength range of 320–2000nm revealed eleven absorption peaks which were assigned to the transitions from the ground level (6H15/2) to several excited energy levels of Dy3+ ion. The Judd-Ofelt (JO) intensity parameters (Ω2,Ω4,andΩ6) were evaluated to predict the radiative properties including transition probability, radiative lifetime, and branching ratios. Emission spectra of the prepared glass under 452nm (6H15/2→4I15/2) excitation wavelength consisted of four bands centered at 480, 574, 662 and 752nm which were originated from 4F9/2→6HJ (J=15/2, 13/2, 11/2 and 9/2) transitions. Emission spectra were further used to determine the effective bandwidth, the stimulated emission cross-section, and branching ratios.
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