Sub-kilogram-Scale One-Pot Synthesis of Highly Luminescent and Monodisperse Core/Shell Quantum Dots by the Successive Injection of Precursors

Authors


  • This work is supported by the National Core Research Center program of the Korea Science and Engineering Foundation (KOSEF) through the NANO Systems Institute at Seoul National University. The authors thank Prof. H.-J. Kim for valuable discussions and comments. Jae Il Kim is grateful for financial support from the BK21 program. Supporting Information is available online from Wiley InterScience or from the author.

Abstract

The one-pot synthesis of core/shell quantum dots (QDs) represents an attractive alternative to conventional synthesis techniques, where the core CdSe QDs are first purified and then an epitaxial shell of the desired thickness is obtained by the slow addition of shell precursors to a solution of the purified QDs at high temperature. We have developed a one-pot synthesis procedure involving the successive injection of deliberately selected core- and shell-forming reagents at appropriate temperatures. Sub-kilogram quantities of highly luminescent and monodisperse core/shell QDs with desirable optical properties (full width at half maximum of photoluminescence (PL) band is ca. 30 nm) have been produced by the sequential growth of the core and shell in a controlled manner. This one-pot method has also been extended to form water-soluble core/double-shell CdSe/ZnSe/ZnS QDs exhibiting high PL efficiency and stability.

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