US Patent 7253452 - Blue light semiconductor nanocrystal

http://www.freepatentsonline.com/7253452.html

This patent from M.I.T. teaches fabrication methods for improved light emissive nanocrystals of blue wavelengths. Claim 1 reads:

1. A semiconductor nanocrystal comprising: a core including a first semiconductor material; and an overcoating on the core, the overcoating including a second semiconductor material, wherein the nanocrystal is substantially free of deep-trap emission sites, and the nanocrystal when excited emits blue light.