Abstract
In this paper photoluminescense spectra and EPR-signals of ZnO single crystals, doped with manganese and containing (from EPR data) uncontrolled impurity of iron, were investigated. At the temperature of 4.5 K in photoluminescense spectrum the band in energy interval of 1.55-1.8 eV (12493 – 14508 cm-1) was observed. This band contains some intensive lines; these lines are caused by Fe3+ ions (d5-configuration). The first and most intensive line at the energy of 1.79 eV corresponds to irradiative transition 4T1 (G) → 6A1 (S) in Fe3+ ions. The other peaks are electronic-vibrational structure. This structure may be caused by force interaction in deformed Fe3+ - 4O2- - cluster.
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