Résumé:
The glass of composition 50GeO2-40PbO-8.5PbF2-1.5Dy2O3 (doped with Dy3+
trivalent ions) was synthesized by the melt quenching technique. In the perspective of exploring the
spectroscopic properties of our material, we performed a spectroscopic study on this glass. We have
investigated the intensities of electronic transitions and the environment of the ligands around the
Dy3+ ion. The values obtained were determined using the semi-empirical theory known as Judd-Ofelt
(J-O) by exploiting the absorption spectra of the glass produced. The luminescence spectra measured
show intense emissions at 572 and 474 nm as well as less intense emissions around 662 and 751 nm.
Various radiative properties of the 4F9/2 excited level of the Dy3+ ion have been calculated. The
transition probabilities have been measured. The radiative lifetimes of the main emitting levels have
been deduced. The yellow-to-blue (Y/B) intensity ratio values are calculated using the emission
spectra to evaluate the emitted light. The results obtained suggest the usefulness of glass for yellow
laser and white LED applications.
