Paper eintragenSingle crystals were investigated by using photoluminescence and optical detection of electron paramagnetic resonance techniques. All of the crystals were found to exhibit intense photoluminescence which extended from the visible to the near-infrared. Several S = 1 centers, each with its own distinct emission spectrum, and distant S= ½ pair recombination centers were observed via optically detected electron paramagnetic resonance. Apart from one center, D5, no hyperfine structure was observed; thus preventing chemical identification of the impurity which was involved. In the case of D5, the partially resolved hyperfine structure suggested interaction with a 100% abundant nucleus of I ~ 5/2. It was suggested to be associated with a displaced host Al atom.

Optically Detected Electron Paramagnetic Resonance of AlN Single Crystals. P.M.Mason, H.Przybylinska, G.D.Watkins, W.J.Choyke, G.A.Slack: Physical Review B, 1999, 59[3], 1937-47