Patent ID: 7719018

Claim:
A light emitting device comprising: a region of first conductivity type; a region of second conductivity type; an active region disposed between the region of first conductivity type and the region of second conductivity type, the active region being capable of emitting light having a wavelength λ n in the region of second conductivity type; and a surface reflective of the light emitted by the active region, wherein one of the region of first conductivity type and the region of second conductivity type is disposed between the active region and the reflective surface; wherein: the active region comprises a first cluster and a second cluster, each of the first and second clusters comprising at least two quantum well layers separated by a barrier layer; each of the first and second clusters has a total thickness less than or equal to about 580 angstroms; a portion of the first cluster is located between 0.6λ n and 0.75λ n from the reflective surface; a portion of the second cluster is located between 1.1λ n and 1.4λ n from the reflective surface; and the first and second clusters are separated by a semiconductor layer that is thicker than each barrier layer.