Optical studies of Eu³⁺ doped oxyfluoroborate glass

Rare earth doped oxyfluoroborate glasses have been prepared with different concentration of Eu³⁺. The UV-Vis/NIR optical absorption, laser induced fluorescence and photoacoustic spectra of Eu³⁺ in this host have been studied. Different optical parameters such as oscillator strength, Judd-Ofelt intensity parameter, stimulated emission cross-section, transition probability, branching ratio and radiative lifetime, etc. have been calculated. Lifetime of the ⁵D₀ level at various concentrations of Eu³⁺ have been used to explain the concentration dependent fluorescence quenching. The mechanism of quenching was found to be dipole-dipole. Energy transfer have also been studied from Eu³⁺ to Pr³⁺ in sample with 1mol% Eu³⁺ + 1 mol% Pr³⁺.