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Turning ZnO into an Efficient Energy Upconversion Material by Defect Engineering
Linköping University, Department of Physics, Chemistry and Biology, Functional Electronic Materials. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Functional Electronic Materials. Linköping University, The Institute of Technology.
Gwangju Institute Science and Technology, South Korea .
University of California, La Jolla, USA.
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2014 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 24, no 24, 3760-3764 p.Article in journal (Refereed) Published
Abstract [en]

Photon upconversion materials are attractive for a wide range of applications from medicine, biology, to photonics. Among them, ZnO is of particular interest owing to its outstanding combination of materials and physical properties. Though energy upconversion has been demonstrated in ZnO, the exact physical mechanism is still unknown, preventing control of the processes. Here, defects formed in bulk and nanostructured ZnO synthesized using standard growth techniques play a key role in promoting efficient energy upconversion via two-step two-photon absorption (TS-TPA). From photoluminescence excitation of the anti-Stokes emissions, the threshold energy of the TS-TPA process is determined as being 2.10-2.14 eV in all studied ZnO materials irrespective of the employed growth techniques. This photo-electron paramagnetic resonance studies show that this threshold closely matches the ionization energy of the zinc vacancy (a common grown-in intrinsic defect in ZnO), thereby identifying the zinc vacancy as being the dominant defect responsible for the observed efficient energy upconversion. The upconversion is found to persist even at a low excitation density, making it attractive for photonic and photovoltaic applications.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2014. Vol. 24, no 24, 3760-3764 p.
Keyword [en]
nonlinear optics; zinc oxide; zinc vacancy; photoluminescence; electron paramagnetic resonance
National Category
Chemical Sciences Physical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-109192DOI: 10.1002/adfm.201400220ISI: 000337953200015OAI: oai:DiVA.org:liu-109192DiVA: diva2:737338
Funder
Swedish Research Council, 621–2010–3971
Available from: 2014-08-12 Created: 2014-08-11 Last updated: 2017-12-05Bibliographically approved

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Turning ZnO into an Efficient Energy Upconversion Material by Defect Engineering(771 kB)154 downloads
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Stehr, Jan EricChen, ShulaChen, WeiminBuyanova, Irina

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