期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 130, 期 3, 页码 909-914出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2011.08.009
关键词
Semiconductors; CdS/ZnS core/shell QDs; Luminescence; Optical properties; Epitaxial growth
资金
- National High Technology Research and Development Program of China [2007AA03Z301]
- National Basic Research Program of China [2007CB9-36001]
- National Natural Science Foundations of China [20771032, 61076040]
- Anhui Province [070414200]
- Natural Science Foundations of Guangxi University of Technology [0840109]
Highly luminescent blue-emitting CdS/ZnS core/shell quantum dots (QDs) were synthesized in N-oleoylmorpholine by two facile steps: first, the CdS core QDs were prepared via a simple one-pot method involving a direct reaction of Cd precursor cadmium stearate and S precursor S powder in solvent N-oleoylmorpholine; second, ZnS shells were successively overcoated on CdS core through the decomposition of single molecular precursor zinc diethyldithiocarbamate. The thickness of shell was precisely tuned by controlling drip feed speed and amount of shell precursor. The obtained CdS/ZnS core/shell QDs showed the maximum photoluminescent quantum yield of 54.8% and narrow spectra bandwidth, exhibiting high monodispersity, good color purity and long fluorescent lifetimes. The CdS/ZnS core/shell QDs with tunable emission wavelength of 424-470 nm were obtained by controlling the thickness of ZnS shell overgrown on different-sized CdS QDs, which are promising materials for blue light-emitting devices. (C) 2011 Elsevier B.V. All rights reserved.
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