期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 133, 期 5, 页码 1176-1179出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja108261h
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资金
- U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences (BES)
- Chemical Sciences, Bioscience and Geosciences Division of BES, U.S. DOE
We report an efficient synthesis of copper indium sulfide nanocrystals with strong photoluminescence in the visible to near-infrared. This method can produce gram quantities of material with a chemical yield in excess of 90% with minimal solvent waste. The overgrowth of as-prepared nanocrystals with a few monolayers of CdS or ZnS increases the photoluminescence quantum efficiency to > 80%. On the basis of time-resolved spectroscopic studies of core/shell particles, we conclude that the emission is due to an optical transition that couples a quantized electron state to a localized hole state, which is most likely associated with an internal defect.
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