Journal
JOURNAL OF APPLIED PHYSICS
Volume 96, Issue 1, Pages 237-241Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1753075
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Excitation dynamics in Er3+-Yb3+ co-doped phosphate glasses were examined as a function of both erbium and ytterbium concentration by monitoring fluorescence on the 1.5 mum I-4(13/2)-->I-4(15/2) transition of Er3+ following pulsed laser excitation of the system at 977 nm under room temperature. For the range of donor (Yb3+) and acceptor (Er3+) concentration considered, both nonexponential and exponential relaxation dynamics were observed. Nonexponential acceptor fluorescence is characteristic of noninteracting donor (Yb3+) regime, while the exponential response is consistent with interacting donors. For the latter case, the linear acceptor dependence for the Yb3+-Er3+ transfer rate K implies energy super migration among donor ions. (C) 2004 American Institute of Physics.
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