Visible and mid-infrared spectral emissions and radiative rates calculations of Tm3+ doped BBLC glass

Quaternary glasses with the composition 75Li(2)B(2)O(7)-(15-x)BaO-10CdO-xTm(2)O(3) (BBLC) (0 <= x <= 2 mol %) have been prepared by melt-quenching method. The structure changes, the absorption coefficient of OH- and the maximum phonon energy of these glasses are studied by ET-IR spectra. Optical and emission properties of Tm3+ doped BBLC glasses have been investigated at room temperature. The optical band gap (E-opt), dispersion parameters and Urbach's energy (Eu) of the prepared samples have been estimated. Judd-Ofelt theory has been applied to obtain the radiative rates and optical intensity parameters. Oscillator strengths, radiative life-times, and branching ratio of different transitions have been calculated. Derived emission cross sections of the emission transitions in the visible range arc determined. A strong emission is observed at 455 nm, this line is attributed to D-1(2) -> F-3(4). Spectral line in the blue region has been observed at wavelength of 515 nm, as well. Two central wavelengths of 1.2 mu m and 1.8 mu m, which are located in the short- and mid- wave IR spectral regions, are analyzed. These emissions are attributed to the transitions H-3(5)-> H-3(6) and F-3(4)-> H-3(6), respectively. (C) 2020 Elsevier B.V. All rights reserved.