Optical properties of Eu3+ and Ho3+ in fluoride glasses

Conclusions Emission and excitation spectra as well as the lifetime and the Judd-Ofelt parameters were determined for the different sites occupied by Eu³⁺ ions in a fluorzirconate glass. As has been observed in borate glasses, the Ω₄ parameter increases with the excitation energy of the⁷F₀→⁵D₀ transition, while Ω₄ is nearly constant 5, 6]. These parameters are lower than in borate glasses by a factor of close to 3. The optical properties of the Eu³⁺ ions in the studied glass appear to be dominated by only one class of sites; however, the presence of a second class of sites is possible. Efficient energy transfer from Eu³⁺ to Ho³⁺ is observed, but the energy transfer parameter does not depend appreciably on the excitation wavelength. Published in Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 4, pp. 185–190, July–August, 1995.