Judd-Ofelt analysis and luminescence studies of Er3+ doped halogeno-antimonate glasses

Abstract This research paper emphasized on application of Judd-Ofelt's (JO) theory for low doped erbium (0.2 mol%) halogeno-antimonate based glasses with molar composition (90 –x) Sb2O3 - x ZnBr2 - 10 NaCl (where x = 10, 20, 30 and 40 mol%). 80 Sb2O3 – 9.8 ZnBr2 - 10 NaCl - 0.2 Er2O3 glass sample has low phonon energy and high refractive index is a potential candidate for luminescence applications. Differential scanning calorimetry (DSC) measurements show good the thermal stability of the prepared glass samples and on the other hand density, expansion coefficient and elastic moduli were reported. Judd-Ofelt's (JO) parameter intensities Ω2 = 3.27 × 10−20 cm2, Ω4 = 1.24 × 10−20 cm2 and Ω6 = 1.88 × 10−20 cm2 were found and these were compared with the literature. Radiative parameters such as spontaneous emission rate, branching ratio and lifetime were calculated. We focused on a high branching ratio radiative transitions 2H11/2 → 4I15/2 (β = 0.94) and 4F9/2 → 4I15/2 (β = 0.901). The overlap between absorption and emission bands is partial and stokes type shifts were presented. The gain curves were determined after calculation of absorption and stimulated emission cross sections. The infrared transmission curve of the glass matrix was marked extrinsic absorption bands SiO and hydroxyl OH possessed high vibration energy played quenching effect for photoluminescence.