The Tb3+-doped gadolinium calcium silicoborate (BSGdCaTb) glasses of composition (55-x) B2O3- 10 SiO2- 25 Gd2O3-10 CaO -x Tb2O3, where x = 0.01, 0.05, 0.1, 0.5, 1.0, and 2.0 mol %, have been prepared by conventional melt quenching technique and are characterized through thermal, absorption, excitation, emission and decay rate measurements. The optical band gap (Eopt) and Urbach's energies (ΔE) have been evaluated taking into account the ultraviolet (UV) edge of absorption spectra. The Tb3+-doped BSGdCaTb glasses exhibit strong emission in the green (5D4 → 7FJ, J = 3,4,5 and 6) and very weak emission in the ultraviolet blue (5D3 → 7FJ, J = 3,4,5 and 6) transitions under excitation at 275 nm, respectively. The intensity of the5D4 → 7F5(green at 543 nm) and5D3 → 7F4(blue at 436 nm) emissions and their integrated intensity ratios (IG/IB) and (IB/IG) under 275 nm excitation have been obtained as a functions of Tb3+concentration, respectively. The emission intensity of Gd3+at 312 nm decreases with increasing of Tb2O3concentration, while emission intensity of Tb3+increases upto 1.0 mol % concentration of Tb2O3. The Tb3+ion decay time for5D4level has been determined and is found to be slightly decreases with increasing of Tb2O3concentration. The CIE color coordinates and color purity have been calculated for Tb3+-doped glasses and it have found to be shift towards the bright green region with increasing of Tb3+ion concentration in BSGdCaTb glasses.
- Decay time
- Energy transfer
- Gadolinium calcium silicoborate glasses