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http://dx.doi.org/10.3740/MRSK.2008.18.12.640

Enhanced UV-Light Emission in ZnO/ZnS Quantum Dot Nanocrystals  

Kim, Ki-Eun (Department of Materials Science & Engineering, Korea University)
Kim, Woong (Department of Materials Science & Engineering, Korea University)
Sung, Yun-Mo (Department of Materials Science & Engineering, Korea University)
Publication Information
Korean Journal of Materials Research / v.18, no.12, 2008 , pp. 640-644 More about this Journal
Abstract
ZnO/ZnS core/shell nanocrystals (${\sim}5-7\;nm$ 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 (${\sim}384\;nm$) due to effective surface passivation of the ZnO core, whereas the emission of green light (${\sim}550\;nm$) 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.
Keywords
ZnO/ZnS; ZnO; nanocrystals; photoluminescence; UV-emission;
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