Vol. 30, Issue 4, pp. 517-528

Abstract

Multicomponent indium based fluoride glass singly doped with europium, terbium, holmium and thulium has been investigated using methods of optical spectroscopy. Owing to low energy of phonons available in the glass matrix, the luminescent levels of rare earth ions are depopulated mainly by radiative transitions and nonradiative ion-ion interaction. The latter mechanism has been found to govern the relaxation dynamics of the ⁵D₂, ⁵D₁ levels of europium, the ⁵D₃ level of terbium, the ⁵D₂ level of holmium and the ²D₅, ¹G₄ and ³H₄ levels of thulium when the activator concentration amounts to several mol%.