Abstract
Experimental optical properties of lattice vacancy defects in single crystal α-Al2O3 are reviewed. Specific ultraviolet absorption and luminescence bands are associated with F-type centers. Following extended exposures to epithermal neutron sources, photobleaching and anisotropic properties allowed the association of several of the visible and near infrared bands with F2-type centers. Photoconductivity, photostability and charge state considerations provided tentative placement of defect energy levels with respect to the conduction band edge.
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