Journal
APPLIED PHYSICS LETTERS
Volume 106, Issue 18, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4918804
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Funding
- Global Frontier Center for Multiscale Energy Systems
- Korean Ministry of Science and Technology
- BK21 program and WCU (World Class University) multiscale mechanical design program through the Korea Research Foundation [R31-2008-000-10083-0]
- Institute for Molecular Science [25-T502]
- Grants-in-Aid for Scientific Research [15H03676, 26420673] Funding Source: KAKEN
- National Research Foundation of Korea [2011-0031561] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Luminescent defect centers in wide bandgap materials such as MgO are of great interest for science and technology. Magnesium oxide nanocubes obtained by the self-combustion of Mg metal have long exhibited only a broad 2.9 eV cathodoluminescence band owing to oxygen vacancies (F centers). However, in this work, a room-temperature ultraviolet 4.8 eV cathodoluminescence band has been observed coincident with a 2.5 eV band of the same intensity from an unexplored intrinsic defect in MgO terraced nanocubes and nanospheres produced from Mg metal combustion in an H-2/O-2 flame. Synchrotron radiation excitation spectra reveal that the excitation energy at the onset of both bands is just above the bandgap energy of 7.7 eV, where electrons and holes are generated. We determine that a defect, responsible for both emission bands, creates proximal anion-cation vacancy pairs named P centers that may appear instead of F centers because of changes in the MgO nanoparticle growth conditions. (c) 2015 AIP Publishing LLC.
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