期刊
JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 353, 期 13-15, 页码 1364-1371出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2006.10.060
关键词
chalcogenides; luminescence
yThe optical properties of GeGaSe glasses doped with Er by the addition of Er2S3 have been investigated. Optically uniform glasses have been prepared using stoichiometric compositions with 9-12 at.% Ga and doped with 0.5-2 at.% Er. The radiative lifetime of the I-4 (13/2) -> I-4 15/2 transition has been estimated to be equal to 1.78 ms using the Judd-Ofelt analysis. The photoluminescence lifetime distribution has been investigated in optimized glasses using Quadrature Frequency-Resolved Spectroscopy at room and liquid helium temperatures and at different emission wavelengths. All lifetime distributions were found to be sharp peaks centered at similar to 2 ms. A radiation diffusion model has been used to understand the discrepancy between measured photoluminescence spectra and those predicted by the McCumber theory. The model predicts a radiative lifetime of the I-4 (13/2) -> I-4(15/2) transition to be around 1.72 ms and a much longer nonradiative lifetime. These results assume quasi-uniform distribution of Er3+ ions with negligible concentration-self-quenching and negligible rate of non-radiative relaxation from I-4 (13/2) to I-4 (15/2-) (C) 2007 Elsevier B.V. All rights reserved.
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