Open AccessStrong ultraviolet luminescence of ZnO thin films with nanowall-network structures
Author(s) -
Yang Zhang,
Weifeng Zhang,
Chengxiao Peng
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.010696
Subject(s) - photoluminescence , materials science , ultraviolet , thin film , whispering gallery wave , luminescence , optoelectronics , optics , nanotechnology , physics , resonator
ZnO thin films with three different types of surface structures, smooth, large nanowall-networks, and small nanowall-networks, were grown by a vapor phase transport process. The XRD patterns of these samples showed a high c-axis orientation. Photoluminescence spectra of these samples showed that the intensities of ultraviolet (UV) emission from ZnO thin films having a surface with nanowall-network structures were enhanced by 1-2 orders of magnitude, the linewidths of UV emission were reduced, and the peak positions blueshifted significantly compared with the ZnO film having a smooth surface. The greatly enhanced UV emission was attributed to high crystalline quality with the oriented growth, and whispering gallery mode resonance in the nanowall-formed cavities.