Chem. Mater. 2008, 20, 531–539
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Single-Step Synthesis of Quantum Dots with Chemical Composition Gradients Wan Ki Bae,† Kookheon Char,*,† Hyuck Hur,‡ and Seonghoon Lee*,‡ School of Chemical and Biological Engineering, NANO Systems Institute, National Core Research Center, and School of Chemistry, NANO Systems Institute, National Core Research Center, Seoul National UniVersity, Seoul 151-747, Korea ReceiVed March 19, 2007. ReVised Manuscript ReceiVed October 9, 2007
We demonstrate a single-step synthetic method for highly luminescent (i.e., quantum yield up to 80%) and stable quantum dots (QDs) by using the reactivity difference between Cd and Zn precursors and that between Se and S precursors. A wide range of emission wavelengths (500-610 nm) with a narrow fwhm (
