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MgZnO Nanocrystallites: Photoluminescence and Phonon Properties

Published online by Cambridge University Press:  01 February 2011

John L. Morrison ,
Xiang-Bai Chen ,
Jesse Huso ,
Heather Hoeck ,
James Mitchell ,
Leah Bergman  and
Tsvetanka Zheleva
John L. Morrison
Affiliation:
damean@turbonet.com, University of Idaho, Physics Department, United States
Xiang-Bai Chen
Affiliation:
chen7779@uidaho.edu, University of Idaho, Physics Department, United States
Jesse Huso
Affiliation:
jhuso@uidaho.edu, University of Idaho, Physics Department, United States
Heather Hoeck
Affiliation:
chen7779@uidaho.edu, University of Idaho, Physics Department, United States
James Mitchell
Affiliation:
lbergman@uidaho.edu, University of Idaho, Physics Department, United States
Leah Bergman
Affiliation:
lbergman@uidaho.edu, University of Idaho, Physics Department, United States
Tsvetanka Zheleva
Affiliation:
tzvetanka@us.army.mil, Army Research Lab, United States
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Abstract

We report on the ultraviolet photoluminescence (UV-PL), Raman and structural properties of wurtzite MgxZn1-xO nanopowders of average size ∼ 30 nm that were synthesized via the thermal decomposition method. For the studied composition range of, the room temperature UV-PL was found to be tuned by ∼ 0.24 eV towards the UV-spectral range, and the PL emission was established to be due to an excitonic-type recombination mechanism. The first-order LO Raman mode was found to exhibit a blueshift of ∼ 33 cm-1. The LO-mode of the nanopowders is discussed in terms of a mixed A1-E1 symmetry phonon known as a quasi-LO mode. The observed 30 cm-1 blueshift indicates that the E1 is the principle symmetry component in the Raman scattering of the MgxZn1-xO nanopowders.

Keywords

optical propertiesalloyII-VI
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 892 , 2005 , 0892-FF18-03-EE09-03
Copyright
Copyright © Materials Research Society 2006

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