Noninjection, one-pot synthesis of Cu-deficient CuInS2/ZnS core/shell quantum dots and their fluorescent properties
- Authors
- Nam, Da-Eun; Song, Woo-Seuk; Yang, Heesun
- Issue Date
- 15-Sep-2011
- Publisher
- ACADEMIC PRESS INC ELSEVIER SCIENCE
- Keywords
- Non-toxic; CuInS2/ZanS; Quantum dots; Cu-deficient; Yellow emission; Quantum yield; Recombination pathway
- Citation
- JOURNAL OF COLLOID AND INTERFACE SCIENCE, v.361, no.2, pp.491 - 496
- Journal Title
- JOURNAL OF COLLOID AND INTERFACE SCIENCE
- Volume
- 361
- Number
- 2
- Start Page
- 491
- End Page
- 496
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/19812
- DOI
- 10.1016/j.jcis.2011.05.058
- ISSN
- 0021-9797
- Abstract
- 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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