Role of excitation transfer in luminescence spectra and decay

In general, excitation can be transferred among states either via carrier capture from, and excitation into, the bands, or alternatively, via direct transfer. In the past, the latter process has often been neglected in analyses of luminescence, particularly for semiconductors. We here consider the g...

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Bibliographic Details
Published in:Journal of luminescence 1992-06, Vol.52 (1), p.243-250
Main Authors: Yi, G.-J., Neumark, G.F.
Format: Article
Language:English
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Summary:In general, excitation can be transferred among states either via carrier capture from, and excitation into, the bands, or alternatively, via direct transfer. In the past, the latter process has often been neglected in analyses of luminescence, particularly for semiconductors. We here consider the general consequences of such direct transfer for luminescence phenomena; we then emphasize its role in donor-acceptor pair results, and also present recent evidence, for ZnSe, that this process cannot be neglected. Specifically, we show that both transfer of band carriers to donor-acceptor pairs via excitons and transfer among the donor-acceptor pair levels are playing a role. We suggest that prior puzzling order of magnitude differences in data analyses of DAP spectra can be explained by effects of direct transfer.
ISSN:0022-2313
1872-7883
DOI:10.1016/0022-2313(92)90248-8