US Patent 7888857 - LED with nanoparticle layer recesses

http://www.freepatentsonline.com/7888857.html

This patent from Samsung teaches a way to increase the luminescence efficiency of quantum dot LEDs using a 3D surface topology. Claim 1 reads:

1. A light emitting device comprising

a substrate and a semiconductor nanoparticle layer,

wherein the substrate is provided with a plurality of three-dimensional recesses and semiconductor nanoparticles are arranged on a surface of the plurality of three-dimensional recesses, and

wherein the semiconductor nanoparticle layer comprises a plurality of three-dimensional recesses which correspond to the three-dimensional recesses of the substrate.