Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/9659
Title: Photoluminescence and electron paramagnetic resonance of ZnO tetrapod structure
Authors: Djurisic, AB
Choy, WCH
Roy, VAL
Leung, YH
Kwong, CY
Cheah, KW
Rao, TKG
Chan, WK
Lui, HT
Surya, C 
Issue Date: 2004
Publisher: Wiley-VCH
Source: Advanced functional materials, 2004, v. 14, no. 9, p. 856-864 How to cite?
Journal: Advanced functional materials 
Abstract: ZnO tetrapod nanostructures have been prepared by the evaporation of Zn in air (no flow), dry and humid argon flow, and dry and humid nitrogen flow. Their properties have been investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), photoluminescence (PL) and photoluminescence excitation (PLE) spectroscopies (at different temperatures), and electron paramagnetic resonance (EPR) spectroscopy at -160degreesC and room temperature. It is found that the fabrication conditions significantly influence the EPR and PL spectra obtained. While a g = 1.96 EPR signal is present in some of the samples, green PL emission can be observed from all the samples. Therefore, the green emission in our samples does not originate from the commonly assumed transition between a singly charged oxygen vacancy and a photoexcited hole [K. Vanheusden, C. H. Seager, W. L. Warren, D. R. Tallant, J. A. Voigt, Appl. Phys. Lett. 1996, 68, 403]. However, the green emission can be suppressed by coating the nanostructures with a surfactant for all fabrication conditions, which indicates that this emission originates from surface defects.
URI: http://hdl.handle.net/10397/9659
ISSN: 1616-301X
DOI: 10.1002/adfm.200305082
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