The effects of ${\mathrm{Tm}}^{3+}$ ions on the intensity and lifetime of $1.3\mu \mathrm{m}$ fluorescence from ${\mathrm{Dy}}^{3+}$ ions in ${\mathrm{Ge}}_{25}{\mathrm{Ga}}_5{\mathrm{Sb}}_5{\mathrm{Se}}_{65}$ glass were investigated, and the energy-transfer mechanisms were discussed. ${\mathrm{Tm}}^{3+}$ codoping in ${\mathrm{Dy}}^{3+}$ -doped selenide glasses significantly enhanced the $1.3\mu \mathrm{m}$ fluorescence intensity and remarkably increased corresponding lifetime through an efficient energy transfer from ${\mathrm{Tm}}^{3+}:{}^3\mathrm{H}_5$ to ${\mathrm{Dy}}^{3+}:{}^6\mathrm{F}_{11∕2}{}^6\mathrm{H}_{9∕2}$ . The donor $\left({\mathrm{Tm}}^{3+}\right)$ excitation was transferred to the acceptor $\left({\mathrm{Dy}}^{3+}\right)$ 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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