US Patent 7524746 - High refractive index semiconductor nanocrystal material

http://www.freepatentsonline.com/7524746.html

In order to increase the light extraction efficiency for LED lighting this patent from Evident Technologies teaches a semiconductor nanocrystal material used as an LED encapsulent formed with a high refractive index to minimize scattering and absorption. Claim 1 reads:

1. A high-refractive index material comprising at least one semiconductor nanocrystal composition incorporated in a matrix material, wherein the high-refractive index material has a refractive index greater than 1.5, and wherein the semiconductor nanocrystal composition comprises: (1) a semiconductor nanocrystal core comprising a II-VI, III-V, or IV-VI semiconductor material, the semiconductor nanocrystal core having an outer surface; and (2) a metal layer grown on the outer surface of the semiconductor nanocrystal core, the metal layer having an outer surface.