title: Physical mechanism of blue-shift of UV luminescence of a single pencil-like ZnO nanowire.
abstract: Cathodoluminescence spectroscopy is used to address the ultraviolet (UV) luminescence of a single pencil-like ZnO nanowire whose diameter gradually reduces from bottom to top in the range of 700-50 nm. It is found that the UV emission energy evidently shifts to the high energy with the ZnO nanowire's diameter decreasing and the blue-shift of 90 meV is observed when the nanowire diameter reduces to 50 from 700 nm. The physical mechanism of the UV blue-shift of the ZnO nanowire is attributed to the Burstein-Moss effect under the high carrier concentration.
authors.affiliation: State Key Laboratory of Optoelectronic Materials and Technologies, Institute of Optoelectronic and Functional Composite Materials, School of Physics Science & Engineering, Zhongshan University, Guangzhou, China.
authors.forename: Y H
authors.initials: YH
authors.lastname: Yang
authors.forename: X Y
authors.initials: XY
authors.lastname: Chen
authors.forename: Y
authors.initials: Y
authors.lastname: Feng
authors.forename: G W
authors.initials: GW
authors.lastname: Yang
mesh_terms: D007700:Kinetics; D049449:Luminescence; D008854:Microscopy, Electron; D008855:Microscopy, Electron, Scanning; D053770:Nanowires / Q000737:chemistry*; D014466:Ultraviolet Rays; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D015034:Zinc Oxide