Patent ID: 7781783
Filing Date: 2010-08-24
Classification: H01L

Abstract:
1. A light-emitting diode (LED) device for emitting uniform white light, comprising: an LED die configured to emit light having a peak wavelength less than 500 nm; a first wavelength-converting layer disposed above the LED die and containing a first fluorescent material having an emission spectrum with a peak wavelength between 600 nm and 700 nm; a second wavelength-converting layer disposed above the first wavelength-converting layer and containing a second fluorescent material having an emission spectrum with a peak wavelength between 500 nm and 600 nm; and a light-scattering layer disposed above the second wavelength-converting layer and configured to mix light emitted by the LED die and the first and second wavelength-converting layers to produce the white light with a broad emission spectrum.