Near-band-edge slow luminescence in nominally undoped bulk ZnO

T. Monteiro, A. J. Neves, M. C. Carmo, M. J. Soares, M. Peres, J. Wang, E. Alves, E. Rita, U. Wahl
2005 Journal of Applied Physics  
We report the observation of slow emission bands overlapped with the near-band-edge steady-state luminescence of nominally undoped ZnO crystals. At low temperatures the time-resolved spectra are dominated by the emission of several high-energy bound exciton lines and the two-electron satellite spectral region. Furthermore, two donor-acceptor pair transitions at 3.22 and 3.238 eV are clearly identified in temperature-dependent time-resolved spectroscopy. These donor-acceptor pairs involve a
more » ... n shallow donor at 67 meV and deep acceptor levels at 250 and 232 meV.
doi:10.1063/1.1946200 fatcat:f3i55uqrtvcazp7nzucbsnuebi