Photoluminescence properties of additively coloured MgO. I. Effects of uniaxial stress and ODMR

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Abstract
The results of a detailed study of F centre luminescence in MgO are reported. In particular, the optically detected magnetic resonance of the emitting state and the effects of uniaxial stress on the luminescence band have been measured. It is shown that the results are inconsistent with the fluorescence being due to a spin-triplet state and is proposed that the observed results are consistent with radiative recombination of F+-F- centre pairs formed transiently during optical excitation. The experimental results and the interpretation of them are contrasted with the published models of the F centre absorption/luminescence cycle.