The properties of the 0.88eV photoluminescence in electron-irradiated wurtzite-type material were investigated by using a combination of magneto-optical techniques, including Zeeman measurements, optically detected magnetic resonance and level anti-crossing. The optically detected magnetic resonance which was observed by monitoring the photoluminescence emission was demonstrated to originate from a spin triplet. The symmetry of the corresponding defect was shown to be rhombic, with the principal axes pointing in the high-symmetry directions: Z = [00•1], Y = [1¯1•0], X = [11•0]. The Zeeman measurements showed that the emission arose from an optical transition between a singlet excited state and the singlet ground state. This provided evidence for the indirect detection of the spin triplet optically detected magnetic resonance. Level anti-crossing investigations of the same photoluminescence emission revealed 2 lines. One of these was related to the spin triplet which was detected by optically detected magnetic resonance.

Magneto-Optical Studies of the 0.88eV Photoluminescence Emission in Electron-Irradiated GaN. M.Wagner, I.A.Buyanova, N.Q.Thinh, W.M.Chen, B.Monemar, J.L.Lindström, H.Amano, I.Akasaki: Physical Review B, 2000, 62[24], 16572-7