Abstract
Well-crystallized Mn-doped ZnO nanowires were synthesized by a high-temperaturechemical reduction method. The microscopic and macroscopic photoluminescence (PL)spectra of these Mn-doped ZnO nanowires were studied. Both the free-excitonemission band and the second-order longitude optical (2LO) phonon-assistedemission band were observed in the microscopic PL spectra. Furthermore, fromthe power dependent macroscopic PL spectra, the stimulated emission wasobserved around the 2LO phonon-assisted emission band with an increase inpump fluence, which relates to the strong exciton–phonon couplings along thec-axis in these Mn-doped ZnO nanowires. The nonresonant micro-Raman scatteringspectrum demonstrates the strong 2LO phonon mode, which is enhanced by Mndoping. Resonant micro-Raman scattering shows multi-LO modes, due to the strongexciton–phonon coupling via a deformation potential induced by the Mn ions inthese Mn-doped ZnO nanowires. Moreover, the low-temperature UV PL band isdiscussed to demonstrate the activity of phonons in the Mn-doped ZnO nanowires.
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