US Patent 7842385 - Coated nanoparticle illuminator

http://www.freepatentsonline.com/7842385.html

This patent from Samsung teaches selecting the refractive index of the coating of quantum dot nanoparticles in order to enhance the luminous efficiency of qdot LEDs and displays. Claim 1 reads:

1. A matrix dispersed coated nanoparticle, comprising:

a nanoparticle, which receives and emits light;

a coating material formed on a surface of the nanoparticle, the coating material having an index of refraction which is less than an index of refraction of the nanoparticle; and

a matrix disposed on the coating material, wherein the index of refraction of the coating material is greater than an index of refraction of the matrix.