Journal
OPTICS COMMUNICATIONS
Volume 257, Issue 1, Pages 112-119Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2005.07.022
Keywords
Judd-Ofelt theory; concentration quenching; quantum efficiency; upconversion
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Optical absorption and fluorescence spectra of Dy3+ doped tellurite glass have been studied and Judd-Ofelt theory has been used to derive its optical properties. The effect of temperature on the fluorescence yield and fluorescence quenching for higher concentrations of Dy3+ has been studied and the mechanism involved discussed. It is found that the fluorescence intensity is larger at lower temperature. The lifetime of the F-4(9/2) level has been measured and found to decrease with concentration as well as temperature. Intense upconversion has also been observed in the yellow-green region when pumped with NIR (similar to 862 nm) radiation. An explanation of the same involving energy transfer is offered. (c) 2005 Elsevier B.V. All rights reserved.
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