Optical study of GeO2–PbO–PbF2 oxyfluoride glass singly doped with Pr3+, Nd3+, Sm3+ and Eu3+ (original) (raw)

Glasses with composition 50GeO 2-(50-x-y)PbO-yPbF 2-xLnF 3 (Ln = Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ , Yb 3+) were synthesised in the bulk form. The content of PbF 2 was constant and amounted to 5 mol%, whereas the concentration of luminescent ions was 0.2 and 2 mol%. Absorption and emission spectra were investigated. The results were analysed in the framework of the Judd-Ofelt theory giving the values of the X 2,4,6 intensity parameters, radiative probabilities W r and radiative lifetimes s rad. The dynamics of luminescent levels was studied and experimental lifetimes were determined. Some generalisations with regards to radiative and non-radiative relaxations in GeO 2-PbO-PbF 2 doped with Ln 3+ from Pr 3+ to Yb 3+ are carried out.