Patent ID: 8022388

Claim:
A multi-chip light emitting device (LED) lamp for providing white light, comprising: a first broadband LED chip including a multi-quantum well active region comprising a first plurality of alternating active and barrier layers, the first plurality of active layers respectively comprising different relative concentrations of at least two elements of a first semiconductor compound and respectively configured to emit light of a plurality of different emission wavelengths over a first wavelength range; and a second broadband LED chip including a multi-quantum well active region comprising a second plurality of alternating active and barrier layers, the second plurality of active layers respectively comprising different relative concentrations of at least two elements of a second semiconductor compound and respectively configured to emit light of a plurality of different emission wavelengths over a second wavelength range including wavelengths greater than those of the first wavelength range, wherein the second semiconductor compound has a narrower bandgap than the first semiconductor compound, wherein the light emitted by the first and/or second broadband LED chips defines an asymmetric spectral distribution over the first and/or second wavelength ranges, respectively, and wherein the light emitted by the first and second broadband LED chips combines to provide an appearance of white light.