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Visible Luminescence from ZnO Nanostructures

Published online by Cambridge University Press:  01 February 2011

An-jen Cheng ,
Dake Wang ,
Hee Won Seo ,
Minseo Park  and
Yonhua Tzeng
An-jen Cheng
Affiliation:
[email protected], Auburn Univeristy, Electrical and Computer Engineering, 200 Broun Hall Auburn University, Auburn, AL, 36849, United States, 334-844-1892
Dake Wang
Affiliation:
[email protected], Auburn Univeristy, Department of Physics and Laboratory for Nanophotonics, Auburn, AL, 36849, United States
Hee Won Seo
Affiliation:
[email protected], Auburn Univeristy, Department of Physics and Laboratory for Nanophotonics, Auburn, AL, 36849, United States
Minseo Park
Affiliation:
[email protected], Auburn Univeristy, Department of Physics and Laboratory for Nanophotonics, Auburn, AL, 36849, United States
Yonhua Tzeng
Affiliation:
[email protected], Auburn Univeristy, Alabama Micro/Nano Science and Technology Center, Department of Electrical and Computer Engineering, Auburn, AL, 36849, United States
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Abstract

Room temperature photoluminescence (PL) spectra from zinc oxide (ZnO) nanostructures were studied. ZnO samples were produced via thermal chemical vapor deposition (thermal-CVD) and a variety of ZnO nanostructures were synthesized by adjusting the oxygen content during the growth process. All samples exhibit a sharp and strong ultra-violet near-band-edge (NBE) emission at about 3.18 eV. The visible emission from the samples deposited under an oxygen-deficient condition were dominated by blue-green band emission at 2.34 eV. The intensity of the blue-green band was greatly reduced (so-called green band free) for the ZnO deposited at the center of the wafer while strong violet-blue emission bands and broad bands at yellow-orange-red range were collected from the ZnO grown along the edge of the wafer. We believe that the spatial inhomogeniety was caused by turbulent gas flow in the reaction chamber, which resulted in different local oxygen concentration. Origin of visible luminescence from ZnO nanostructures will be discussed and a model to explain the observed visible luminescence process will be presented.

Keywords

nanostructureII-VIluminescence
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 957: Symposium K – Zinc Oxide and Related Materials , 2006 , 0957-K07-39
Copyright
Copyright © Materials Research Society 2007

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