Physical properties and luminescence of highly stable erbium-doped antimony glasses for NIR broadband amplification.

• Erbium (Er3+) doped Sb 2 O 3 -Na 2 O-WO 3 glasses have been synthesized. • Judd-Ofelt analysis has been used to calculate the radiative transition probabilities (A rad), radiative lifetimes (τ rad), and branching ratios (β). • Broadband emission at 1.53 μm has been obtained under 980 nm laser excitation. • SN0.2WE glass has a minimum W NR value (78.14 s - 1 ) and a maximum quantum efficiency of η = 82.42 % , which is very good compared to other glass hosts. • The emission cross-section and the gain parameter (σ e m a n d F W H M × σ e m ) have considerable bandwidth characteristics higher than other glass hosts. Glasses with compositions (0.8-x)Sb 2 O 3 −0.2Na 2 O-(x)WO 3 -(0.0025) Er 2 O 3 , (0 ≤ x ≤ 0.4 mol) has been synthesized by the melt-quenching technique. Physical, optical characteristics and spectroscopy have been identified and investigated. As the glass composition changes, definite variations in physio-optical properties can be observed as well as the temperature of the glass transition (T g), the density (ρ) , molar volume (V m) , bandgap energy (Eg), and the refractive index (n). The Judd-Ofelt theory has been performed using a UV–VIS-NIR absorption spectrum to examine the compositional effect on Er3+ spectroscopic properties. Some basic spectroscopic parameters including electric dipole line strengths, Judd-Ofelt parameters, the rate of radiative probability, and the lifetime of radiative levels, are determined. A high NIR emission at 1.53 μm was observed when exciting glasses at 980 nm. The FWHM, the effective line-width (Δλ eff), the emission cross-section (σ em), and the gain bandwidth values were calculated using the theory of Füchtbauer–Ladenburg, and the findings were critically analyzed. the decay of fluorescence spectra for the 4I 13/2 level was registered, and the lifetime for the studied glasses was calculated. Upconversion luminescence was observed in the green and red regions under 980 nm excitation, with a relative increase in emission intensity due to the added tungsten content. Based on the results obtained, the studied glasses are favorable materials for broadband amplifiers in WDM systems and optical devices. [ABSTRACT FROM AUTHOR]