Abstract

The effects of Tm3+ ions on the intensity and lifetime of 1.3μm 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 1.3μm fluorescence intensity and remarkably increased corresponding lifetime through an efficient energy transfer from Tm3+:H53 to Dy3+:F1126H926. 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.

© 2006 Optical Society of America

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