LOW-TEMPERATURE LUMINESCENCE QUENCHING AND LOCAL

Photoluminescence (PL) spectroscopy by excitation with 514.5 nm light at 4.2 and 77 K is applied to (GeS2)80(Ga2S3)20: x mol % Er2S3 (x=0.3, 0.6, 0.9, 1.8, 2.1 and 2.4) glasses. The compositional dependence of the PL intensity is determined, and a quenching effect accompanied by the strongest absorption at 1.22 at % Er is established. The influence of temperature on the emission cross-section is investigated by deconvolution of the experimental spectra, and the observed fine features are explained on the basis of the energy level diagram of Er3+ ions. The distribution and changes of the structural units at higher Er concentrations are specified by Raman scattering, in the range 50-550 cm-1