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Photoluminescence and electron paramagnetic resonance of ZnO tetrapod structure

DSpace at IIT Bombay

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Title Photoluminescence and electron paramagnetic resonance of ZnO tetrapod structure
 
Creator DJURISIC, AB
CHOY, WCH
ROY, VAL
LEUNG, YH
KWONG, CY
CHEAH, KW
RAO, TKG
CHAN, WK
LUI, HT
SURYA, C
 
Subject zinc-oxide nanowires
polycrystalline zno
positron-annihilation
spin-resonance
undoped zno
thin-films
luminescence-centers
thermal evaporation
magnetic-resonance
green luminescence
 
Description 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.
 
Publisher WILEY-V C H VERLAG GMBH
 
Date 2011-09-01T19:32:01Z
2011-12-26T12:59:46Z
2011-12-27T05:52:37Z
2011-09-01T19:32:01Z
2011-12-26T12:59:46Z
2011-12-27T05:52:37Z
2004
 
Type Article
 
Identifier ADVANCED FUNCTIONAL MATERIALS, 14(9), 856-864
1616-301X
http://dx.doi.org/10.1002/adfm.200305082
http://dspace.library.iitb.ac.in/xmlui/handle/10054/12852
http://hdl.handle.net/10054/12852
 
Language en