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
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Creator |
DJURISIC, AB
CHOY, WCH ROY, VAL LEUNG, YH KWONG, CY CHEAH, KW RAO, TKG CHAN, WK LUI, HT SURYA, C |
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Subject |
zinc-oxide nanowires
polycrystalline zno positron-annihilation spin-resonance undoped zno thin-films luminescence-centers thermal evaporation magnetic-resonance green luminescence |
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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.
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Publisher |
WILEY-V C H VERLAG GMBH
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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 |
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Type |
Article
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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 |
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Language |
en
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