Abstract
The time dependence of the radiative 0.41 eV 5T 2 → 5E transition of Fe 2+ in GaP: Fe has been measured for the case of below-gap excitation, and the results have been compared to dynamical calculations of the excitation-recombinaion process. The data were found to compare well with a model assuming an optically-induced charge transfer (Fe 3+ → Fe 2+) excitation mechanism. The observed exponential decay of the Fe 2+ luminescence intensity is interpreted as evidence for localization of the photo-induced hole at the Fe 2+ site.
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