Exchange broadened,optically detected ESR spectra for luminescent donor-acceptor pairs in Li doped ZnO |
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| Authors: | RT Cox D Block A Hervé R Picard C Santier R Helbig |
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| Institution: | Section de Résonance Magnétique, Départment de Recherche Fondamentale, Centre d''Etudes Nucléaires de Grenoble, 85X 38041 Grenoble-Cedex, France;Institut für Angewandte Physik der Universität Erlangen-Nürnberg 8520 Erlangen, Germany |
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| Abstract: | Application of optically detected ESR to the yellow photoluminescence of Li doped ZnO gives ESR spectra for shallow donor - lithium acceptor pairs, showing that at least a fraction of the yellow emission is donor-acceptor (D-A) luminescence. The distribution of separations rDA gives a spectrum of D-A exchange interactions J which broaden the ESR lines, particularly at high microwave power, where pairs with long excited state lifetimes, that is large rDA, are power saturated. |
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