Abstract
Optically detected magnetic resonance (ODMR) was studied in ZnO single crystals containing iron impurity ions. ODMR spectra of the ground state of isolated Fe3+ on the Zn2+ lattice sites were obtained by monitoring the intensity of the intra-centre Fe3+ luminescence together with the ODMR signals of shallow donors. The latter observation suggests that the Fe3+ luminescence may actually be excited due to energy transfer from the recombining donor-acceptor pairs to the impurity ions. This conclusion is supported by the presence of Fe3+ emission in the afterglow spectra recorded after switching off band-to band excitation light.
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