Journal
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Volume 73, Issue 7, Pages 858-862Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2012.02.019
Keywords
Photoluminescence; Defects
Funding
- NSFC [11104240, 60976002]
- 973 Program [2011CB302004]
- MOE [20110092130006]
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The corresponding evolutions of morphologies, defect-states and the PL properties have been employed to explore the defect-origins of visible emissions and growth mechanisms of microstructured ZnO. ZnO microtube and microrod whiskers were fabricated by non-catalytic vapor-phase transport using ZnO and graphite powders in air. The microstructures of the samples were studied in detail based on scanning electron microscopy (SEM), x-ray diffraction (XRD), energy-dispersive x-ray spectroscopy (EDX), and electron paramagnetic resonance (EPR). The main PL emission bands evolve from blue to green, which corresponds to that the main defect-states change from Zn interstitials (Zn-i) to O vacancies (V-O). The formation of Zn-i under the high temperature zinc-rich vapor environment is crucial both for the blue emission and for the formation of the microtubes. (C) 2012 Elsevier Ltd. All rights reserved.
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