ZEEMAN SPECTROSCOPY OF THE FE3+ CENTER IN GAN

We report an optical investigation of the Zeeman behavior of the deep iron acceptor in GaN grown on 6H-SiC. The characteristic ground state splitting of the near-infrared luminescence transition at 1.2988 eV al lows for an unambiguous assignment to Fe3+ previously proposed on the basis of ODMR results. The observed luminescence lifetime of 8 ms as w ell as the fine structure of the excited state are consistent with a T -4(1)(G)-(6)A(1)(S) transition. The T-4(1)(G) state is found to couple only weakly to epsilon-type phonon modes. (C) 1995 American Institute of Physics.