Abstract
The effects of Tm3+ ions on the intensity and lifetime of 1.3 µm fluorescence from Dy3+ ions in Ge25Ga5Sb5Se65 glass were investigated, and the energy-transfer mechanisms were discussed. Tm3+ codoping in Dy3+-doped selenide glasses significantly enhanced the 1.3 µm fluorescence intensity and remarkably increased corresponding lifetime through an efficient energy transfer from Tm3+:3H5 to Dy3+:6F11/26H9/2. The donor (Tm3+) excitation was transferred to the acceptor (Dy3+) by direct electric dipole-dipole interaction or migrated among donor ions by diffusion-limited regime until it came into the vicinity of an acceptor ion, where direct interaction and transfer occurred.
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