Efficient Synthesis of Highly Luminescent Copper Indium Sulfide-Based Core/Shell Nanocrystals with Surprisingly Long-Lived Emission

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• 作者：Liang Li ; Anshu Pandey ; Donald J. Werder ; Bishnu P. Khanal ; Jeffrey M. Pietryga ; Victor I. Klimov
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：February 9, 2011
• 年：2011
• 卷：133
• 期：5
• 页码：1176-1179
• 全文大小：795K
• 年卷期：v.133,no.5(February 9, 2011)
• ISSN：1520-5126

文摘

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.