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Title: Photophysics of Point Defects in ZnO Nanoparticles
Authors: Sumin Choi
Matthew R. Phillips
Igor Aharonovich
Soraya Pornsuwan
Bruce C.C. Cowie
Cuong Ton-That
University of Technology Sydney
Mahidol University
Australian Synchrotron
Keywords: Materials Science
Issue Date: 1-Jan-2015
Citation: Advanced Optical Materials. Vol.3, No.6 (2015), 821-827
Abstract: © 2015 WILEY-VCH Verlag GmbH & Co. Zinc oxide (ZnO) nanoparticles have recently been identified as a promising candidate for advanced nanophotonics applications and quantum technologies. This work reports the formation of luminescent point defects and describes their photophysical properties. In particular, it is shown using correlative photoluminescence, cathodoluminescence, electron paramagnetic resonance (EPR), and X-ray absorption near-edge spectroscopy that green luminescence at 2.48 eV and an EPR line at g = 2.00 belong to a surface oxygen vacancy (V<inf>o,s</inf><sup>+</sup>) center, while a second green emission at 2.28 eV is associated with zinc vacancy (V<inf>Zn</inf>) centers. It is established that radiative point defects can be excited in the visible that exhibits nanosecond lifetimes using both above bandgap and sub-bandgap 405 and 532 nm excitation. This work provides important knowledge towards employment of point defects in ZnO in nanophotonics technologies.
ISSN: 21951071
Appears in Collections:Scopus 2011-2015

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