Abstract

Intensity of the 2.9μm fluorescence from Dy3+ in Ge25Ga5S70 glass increased with increasing Tm3+ content when the Dy3+ concentration remained constant, which indicates the presence of an efficient energy transfer between Tm3+ and Dy3+. Analyses of the emission intensities and decay times suggested that a direct energy transfer from the Tm3+:3F4 level to Dy3+:6H11/2 level occurred after a fast diffusion-limited migration of the excitation energy among Tm3+. A decrease in the measured lifetimes of the Tm3+:3F4 level and a wide spectral overlap between the Tm3+: 1.8μm emission and the absorption of Dy3+: 6H15/26F11/2 also supported the proposed energy transfer scheme. Multiphonon relaxation rates in sulfide glasses were orders of magnitude lower than those for conventional oxide glasses.

© 1997 Optical Society of America

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References

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