Thursday, May 10, 2012

US Patent 8174181 - Quantum dot LEDs

This patent from Philips Lumileds Lighting and M.I.T. has priority going back to 1998 and includes some basic claims for white and colored LEDs using quantum dots. Claim 1 reads:

1. A light emitting device comprising:

a primary light source; and

at least one layer in optical communication with the primary light source,

wherein the at least one layer comprises a matrix including a plurality of quantum dots having a polydisperse size distribution and adapted to convert primary light emitted by the primary light source to secondary light,

wherein the secondary light comprises a mixed color of light or white light.                             

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