Strong ultraviolet luminescence of ZnO thin films with nanowall-network structures.
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.
Zhang
Yang
Y
Institute for Physics of Microsystems and Department of Physics, Henan University, Kaifeng, Henan 475004, China. yzhang@henu.edu.cn
Zhang
Weifeng
W
Peng
Chengxiao
C
D003460:Crystallization; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods*; D055095:Optics and Photonics; D013050:Spectrometry, Fluorescence / Q000379:methods; D013499:Surface Properties; D014466:Ultraviolet Rays; D014961:X-Ray Diffraction; D015032:Zinc / Q000737:chemistry; D015034:Zinc Oxide / Q000737:chemistry*
D015032:Zinc; D015034:Zinc Oxide