Raman scattering and cathodoluminescence properties of flower-like manganese doped ZnO nanorods

Flower-like manganese (Mn) doped ZnO nanorods were fabricated by a chemical vapor deposition method using zinc and MnCl2MnCl2 powders as source materials of Zn and Mn, respectively. Raman scattering and cathodoluminescence (CL) are used to study the influence of Mn on the lattice dynamics and optical properties of ZnO. A local vibrational mode located at about 480cm-1 is observed, which is related to Mn dopants. In addition, the presence of a new Raman mode centered at about 526cm-1 as well as the enhancement and redshift of the A1A1(LO) mode is caused by the lattice defects and disorder induced by Mn doping. CL spectra mapping as well as monochromatic CL imaging shows that the ultraviolet emission from the surface is much weaker than that from the interior of the Mn-doped ZnO nanorod, while the green emission from the surface is much stronger than that from the interior.