Kinetics of fluorescence properties of Eu3+ ion in strontium-aluminium-bismuth-borate glasses

Abstract Eu 3+ doped strontium-aluminium-bismuth-borate glasses with the chemical composition (50– x )B 2 O 3 +20Bi 2 O 3 +7AlF 3 + 8SrO+15SrF 2 + x Eu 2 O 3 (where x =0.1 mol.%, 0.5 mol.%, 1.0 mol.% and 1.5 mol.%) were prepared by the conventional melt quenching technique. Structural properties of the prepared glasses were analysed through X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and Raman spectral techniques. Thermal stability of glass was analysed by differential thermal analysis (DTA) curve. Photoluminescence characteristics were studied using excitation, emission spectra and decay curves of Eu 3+ doped strontium-aluminium-bismuth-borate glasses. The Judd-Ofelt (J-O) intensity parameters, Ω λ ( λ =2, 4 and 6) were obtained using emission spectra and was used to identify the nature of Eu 3+ ions with their surrounding ligands. Using J-O parameters the transition probabilities (A), stimulated emission cross-sections σ E p, branching ratios ( β R ) and radiative lifetimes ( τ meas and τ cal ) were evaluated for the 5 D 0 → 7 F J ( J =0, 1, 2, 3 and 4) transition of Eu 3+ ions in the present glasses. The decay profiles were found to be non exponential for all the concentrations and the measured lifetimes ( τ meas ) were obtained from the decay profiles. The higher values of A, σ E p, β R and quantum efficiency ( η ) for 5 D 0 → 7 F 2 emission transition at 617 nm confirmed the present glass was as active medium for red laser emission applications.