Patent Number: 6,251,303

Title: Water-soluble fluorescent nanocrystals

Abstract: A water soluble semiconductor nanocrystal capable of light emission is provided, including a quantum dot having a selected band gap energy, a layer overcoating the quantum dot, the overcoating layer comprised of a material having a band gap energy greater than that of the quantum dot, and an organic outer layer, the organic layer comprising a compound having at least one linking group for attachment of the compound to the overcoating layer and at least one hydrophilic group spaced apart from the linking group by a hydrophobic region sufficient to prevent electron charge transfer across the hydrophobic region. The particle size of the nanocrystal core is in the range of about 12 .ANG. to about 150 .ANG., with a deviation of less than 10% in the core. The coated nanocrystal exhibits photoluminescence having quantum yields of greater than 10% in water.

Inventors: Bawendi; Moungi G. (Boston, MA), Mikulec; Frederick V. (Somerville, MA), Lee; Jin-Kyu (Seoul, KR)

Assignee: Massachusetts Institute of Technology

International Classification: G01N 33/58 (20060101); G01N 33/533 (20060101); H01L 33/00 (20060101); C09K 011/02 ()

Expiration Date: 06/26/2018