US Patent 8030843 - Quantum dot phosphors for solid state lighting

http://www.freepatentsonline.com/8030843.html

This patent from WiSys Technology Foundation teaches a way to use quantum dots in an LED to simulate a white light close to diffuse sunlight. Claim 1 reads:

1. A solid-state lamp comprising:

a light emitting diode providing an ultraviolet light output;

a quantum dot phosphor receiving the ultraviolet light to emit a white light, the quantum dot phosphor comprising:

(a) a quantum dot;

(b) a capping layer surrounding the quantum dot; and

(c) an activator material attached to the capping layer to be spaced from the quantum dot by the capping layer so as to promote phosphorescence with the quantum dot.