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|Title:||Phonon-assisted stimulated emission in Mn-doped ZnO nanowires||Authors:||Liu, R.
|Issue Date:||4-Apr-2007||Citation:||Liu, R., Pan, A., Fan, H., Wang, F., Shen, Z., Yang, G., Xie, S., Zou, B. (2007-04-04). Phonon-assisted stimulated emission in Mn-doped ZnO nanowires. Journal of Physics Condensed Matter 19 (13) : -. ScholarBank@NUS Repository. https://doi.org/10.1088/0953-8984/19/13/136206||Abstract:||Well-crystallized Mn-doped ZnO nanowires were synthesized by a high-temperature chemical reduction method. The microscopic and macroscopic photoluminescence (PL) spectra of these Mn-doped ZnO nanowires were studied. Both the free-exciton emission band and the second-order longitude optical (2LO) phonon-assisted emission band were observed in the microscopic PL spectra. Furthermore, from the power dependent macroscopic PL spectra, the stimulated emission was observed around the 2LO phonon-assisted emission band with an increase in pump fluence, which relates to the strong exciton-phonon couplings along the c-axis in these Mn-doped ZnO nanowires. The nonresonant micro-Raman scattering spectrum demonstrates the strong 2LO phonon mode, which is enhanced by Mn doping. Resonant micro-Raman scattering shows multi-LO modes, due to the strong exciton-phonon coupling via a deformation potential induced by the Mn ions in these Mn-doped ZnO nanowires. Moreover, the low-temperature UV PL band is discussed to demonstrate the activity of phonons in the Mn-doped ZnO nanowires. © IOP Publishing Ltd.||Source Title:||Journal of Physics Condensed Matter||URI:||http://scholarbank.nus.edu.sg/handle/10635/97529||ISSN:||09538984||DOI:||10.1088/0953-8984/19/13/136206|
|Appears in Collections:||Staff Publications|
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