Abstract
Abstract The upconversion properties of Er3+ in fluoroindate bulk glasses (composition: 40InF3−20ZnF2−16BaF2−(20−x)SrF2−2GaF3−2NaF−xErF3 with x=1,2,3 and 4 mole %) are investigated, following 4 F 9 2 excitation with a red krypton laser. A strong green and a weaker blue luminescence is observed at room temperature corresponding to emissions from the thermally coupled 4 S 3 2 and 2 H 11 2 bands and the 2 H 9 2 level respectively. Resonant energy transfer processes involving two excited erbium ions and a two-step absorption process are proposed to explain the upconversion phenomena. The emission intensities depend on the excitation power as Pexcn with 1.5≤n≤1.7 for the green and 1.6≤n≤1.9 for the blue emission. The decay times and the relative intensities of the luminescence are also studied as a function of Er3+ concentration.
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