US 6,207,229 B1 · Highly luminescent color-selective materials and method of making thereof

Abstract

A coated nanocrystal capable of light emission includes a substantially monodisperse nanoparticle selected from the group consisting of CdX, where x=S, Se, Te and an overcoating of ZnY, where Y=S, Se, uniformly deposited thereon, said coated nanoparticle characterized in that when irradiated the particles exhibit photoluminescence in a narrow spectral range of no greater than about 60 nm, and most preferably 40 nm, at full width half max (FWHM). The particle size of the nanocrystallite core is in the range of about 20 Å to about 125 Å, with a deviation of less than 10% in the core. The coated nanocrystal exhibits photoluminescence having quantum yields of greater than 30%.

Claims20

Dependent claims

A method of preparing a coated nanocrystal capable of light emission, comprising:

introducing a substantially monodisperse core population, wherein each member of the core population comprises a first semiconductor material, and a precursor capable of thermal conversion into a second semiconductor material into a coordinating solvent, the monodisperse core population, when irradiated, emits light in a spectral range of no greater than about 60 nm full width half max (FWHM),
wherein the coordinating solvent is maintained at a temperature sufficient to convert the precursor into the second semiconductor material yet insufficient to substantially alter the monodispersity of the core population,
wherein the second semiconductor material has a band gap greater than the first semiconductor material, and
whereby an overcoating of the second semiconductor material is formed on a member of the core population.

1 more element

Dependencies are inferred from the claim text.

Highly luminescent color-selective materials and method of making thereof

Life of this patent

Highly luminescent color-selective materials and method of making thereof

Life of this patent

Abstract

Claims20