Patent ID: 7695642
Filing Date: 2010-04-13
Classification: B82Y,C01P,C09C,C09K,H01L,Y10S,Y10T

Abstract:
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.