The effects of Tm<sup>3+</sup> ions on the intensity and lifetime of 1.3 µm fluorescence from Dy<sup>3+</sup> ions in Ge<sub>25</sub>Ga<sub>5</sub>Sb<sub>5</sub>Se<sub>65</sub> glass were investigated, and the energy-transfer mechanisms were discussed. Tm<sup>3+</sup> codoping in Dy<sup>3+</sup>-doped selenide glasses significantly enhanced the 1.3 µm fluorescence intensity and remarkably increased corresponding lifetime through an efficient energy transfer from Tm<sup>3+</sup>:<sup>3</sup>H<sub>5</sub> to Dy<sup>3+</sup>:<sup>6</sup>F<sub>11/2</sub><sup>6</sup>H<sub>9/2</sub>. The donor (Tm<sup>3+</sup>) excitation was transferred to the acceptor (Dy<sup>3+</sup>) 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
Original Manuscript: August 5, 2005
Revised Manuscript: September 21, 2005
Manuscript Accepted: September 22, 2005
Zhiyong Yang, Lan Luo, and Wei Chen, "Energy transfer from Tm3+:3H5 to Dy3+:6F11/2 6H9/2 in selenide glasses," J. Opt. Soc. Am. B 23, 358-362 (2006)