US Patent 7102152 - Quantum Dot and Non-Quantum Dot Fluorescent Mixture

http://www.freepatentsonline.com/7102152.pdf

For lighting and display applications there is much interest in producing white light LEDs, however most LEDs have a narrow emission spectrum allowing for only single color emission. This patent proposes the use of a mixture of both quantum dot and non-quantum dot fluorescent material to broaden the spectrum and achieve white light sources from narrow band emission. Claim 1 reads:

1. A device for emitting output light, said device comprising: a light source that emits original light; and a wavelength-shifting region optically coupled to said light source to receive said original light, said wavelength-shifting region including at least one type of quantum dots to convert some of said original light to first converted light, said wavelength-shifting region further including non-quantum fluorescent material to convert some of said original light to second converted light, said first converted light and said second converted light being components of said output light.