CL from ZnO nanowires and microneedles Co-doped with N and Mn

摘要

Cathodoluminescence (CL) was used to study the luminescence emission of ZnO : N, Mn nanowires and microneedles grown by thermal evaporation. CL spectra acquired at room temperature showed the presence of near band edge and defect-related emissions. The defect related emission comprised two bands centered at 2.28 and 2.5 eV. The first component was attributed to the formation of spinel ZnMn_2O_4 and the second to the well-known ZnO green emission. CL spectra acquired at 100 K showed two emissions centered at 3.22 and 3.25 eV that were attributed to donor-acceptor pair (DAP) and FA transitions, respectively. It was proposed that substitutional nitrogen (N_O) and zinc interstitial (Zn_i) were acceptor and shallow-donor centers in the DAP transition.