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Enhanced UV-light emission in ZnO/ZnS quantum dot nanocrystals

Authors
Kim, K.-E.Kim, W.Sung, Y.-M.
Issue Date
2008
Keywords
Nanocrystals; Photoluminescence; UV-emission; ZnO; ZnO/ZnS
Citation
Korean Journal of Materials Research, v.18, no.12, pp.640 - 644
Indexed
SCOPUS
KCI
Journal Title
Korean Journal of Materials Research
Volume
18
Number
12
Start Page
640
End Page
644
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/125303
DOI
10.3740/MRSK.2008.18.12.640
ISSN
1225-0562
Abstract
ZnO/ZnS core/shell nanocrystals (∼5-7 nm in diameter) with a size close to the quantum confinement regime were successfully synthesized using polyol and thermolysis. X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) analyses reveal that they exist in a highly crystalline wurtzite structure. The ZnO/ZnS nanocrystals show significantly enhanced UV-light emission (∼384 nm) due to effective surface passivation of the ZnO core, whereas the emission of green light (∼550 nm) was almost negligible. They also showed slight photoluminescence (PL) red-shift, which is possibly due to further growth of the ZnO core and/or the extension of the electron wave function to the shell. The ZnO/ZnS core/shell nanocrystals demonstrate strong potential for use as low-cost UV-light emitting devices.
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