Etude et caractérisation de matériau vitreux transparent dopé par des ions lanthanides

Abstract

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.