Samples of heavy metal oxide glasses, (TeO2)(60) - (PbCl2)(40-x) . (PbF2)(x) where x is an element of <0; 40>, were prepared and characterized by absorption and photoluminescence spectroscopy. The role of F --> Cl substitution on optical and luminescence properties has been investigated. Selected samples were doped by Er using metal, chloride and oxide precursors. Photoluminescence spectra have been measured over a wide temperature range (4-300 K) and the role of multi-phonon transitions in mediating the inner 4f-4f electronic transitions was confirmed. (C) 2003 Elsevier B.V. All rights reserved. [References: 10]
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