Cathodoluminescence from defects in indented MgO

Transmission electron microscopy and the cathodoluminescence mode in the scanning electron microscope have been used to study indented MgO single crystals and to relate luminescence emission and defect structure. Color images of cathodoluminescence indentation rosette have been also obtained. Marked differences in the emission and the defect structure in different areas of indentation have been found and in particular a high density of defects have been observed in the center of indentation including some defects which seem to be characteristic of this region.