Noninjection, one-pot synthesis of Cu-deficient CuInS2/ZnS core/shell quantum dots and their fluorescent properties

作者：Nam Da Eun; Song Woo Seuk; Yang Heesun^*

来源：Journal of Colloid and Interface Science, 2011, 361(2): 491-496.

DOI：10.1016/j.jcis.2011.05.058

• Non-toxic
• CuInS2/ZanS
• Quantum dots
• Cu-deficient
• Yellow emission
• Quantum yield
• Recombination pathway

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.

• 出版日期2011-9-15