Preparation of stable, bright luminescent nanoparticles having compositionally engineered properties

  • US 7,695,642 B2
  • Filed: 12/13/2004
  • Issued: 04/13/2010
  • Est. Priority Date: 12/12/2003
  • Status: Active Grant
First Claim
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1. A method for preparing quantum dot nanoparticles that exhibit emission in the red or infrared spectral range which comprises:

  • (i) combining a cadmium precursor, a selenium precursor, and a tellurium precursor in a solvent, wherein the mole ratio of tellurium to selenium is in the range of about 0.01 to about 0.10;

    (ii) inducing formation of a nanoparticle core using a first accelerant;

    (iii) combining the nanoparticle core with a solvent, a sulfur precursor, a second accelerant, and a cadmium precursor, a zinc precursor, or both a cadmium precursor and a zinc precursor, wherein at least one of the first accelerant and the second accelerant is a chemical promoter,wherein the cadmium precursor employed is a cadmium oxide, a halogenated cadmium compound, or a cadmium salt,wherein the nanoparticles have a peak emission wavelength that is at least 50 nm longer than that of identically sized nanoparticles composed of Cd and Se, and no Te.

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