Title: Luminescence studies on Eu3+: B2O3-SrO-TiO2-LiO- Al2O3 glasses

Abstract

Luminescence studies on Eu3+ ions doped in Borate glasses (7TiO2+3Al2O3+(60-x)B2O3+xEu2O3+ 5LiCO3 + 25SrCO3) (where x =0.05, 0.10, 0.15 and 0.20), containing heavy metals, alkali and alkaline were prepared using a conventional melt quenching technique. Judd-Ofelt (JO) intensity parameters were determined from the luminescence spectra and used to investigate the nature of Eu3+ ions with its surrounding ligands. The JO parameters (Ω2, Ω4 and Ω6) were used to determine the radiative spectroscopic properties such as radiative transition probability (AR), branching ratio (βR) and stimulated emission cross-section(σ_P^E ) for the 5D0-->7F2,4,5 transitions of Eu3+ ions. Theoretically optical gain parameter and gain bandwidth were calculated, shows a vital role in laser application. The higher values of Ω2 confirms the hypersensitive nature of the 5D0-->7F2 transition and further it indicates the covalent nature of the Eu-O bond and higher asymmetry of all the prepared glasses. Among the prepared glass in 0.2 mole Eu3+ doped glass found to have better values. The stimulated emission cross-section, branching ratio and quantum efficiency for the glass corresponding to 5D0->7F2 transition is found to be 8.98 ×10-22 cm2, 0.62 and 80.2% which indicates its suitability for red laser application.