期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 361, 期 2, 页码 491-496出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2011.05.058
关键词
Non-toxic; CuInS2/ZanS; Quantum dots; Cu-deficient; Yellow emission; Quantum yield; Recombination pathway
资金
- MKE/IITA [2009-F-020-01]
- Hongik University
- Korea Evaluation Institute of Industrial Technology (KEIT) [KI002126] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Non-toxic, environment-benign colloidal CuInS2 (CIS) quantum dots (QDs) were synthesized through a facile noninjection, one-pot approach by reacting Cu and In precursors with dodecanethiol dissolved in 1-octadecence at 220 degrees C. The Cu:In precursor molar ratio was varied from 1:1 to 1:4 to intentionally generate Cu-deficient CIS QDs. Depending on the stoichiometry of the QDs, their emission peak wavelengths were tuned in red-deep red region. More Cu-deficient CIS QDs (Cu:In = 1:4) were found to be more efficient than ones with Cu:In = 1:1. After successive ZnS shell was overgrown on the surface of core QDs with Cu:In = 1:4, the resulting core/shell QDs exhibited a highly efficient yellow emission with a quantum yield of similar to 50%. A substantially blue-shifted emission from the core/shell QDs versus core ones was described by suggesting an alternative recombination pathway that may be induced by the ZnS shell coating. (C) 2011 Elsevier Inc. All rights reserved.
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