Patent ID: 8502266
Filing Date: 2013-08-06
Classification: H01L

Abstract:
1. A nitride semiconductor light emitting device comprising: n-type and p-type nitride semiconductor layers; and an active layer disposed between the n-type and p-type nitride semiconductor layers and having a stack structure in which a plurality of quantum barrier layers and a plurality of quantum well layers having bandgap energy lower than that of the plurality of quantum barrier layers are alternately stacked, wherein the absolute value of a net polarization mismatch at an interface between one of the plurality of quantum barrier layers and the quantum well layer adjacent thereto is smaller than the absolute value of a net polarization mismatch between GaN and the quantum well layer adjacent to the one of the plurality of quantum barrier layers, at least one of the plurality of quantum barrier layers has a superlattice structure in which first and second layers respectively formed of InGaN and GaN are alternately stacked, the first and second layers having larger bandqap energy than those of the plurality of quantum well layers, and at least one of the quantum barrier layers having the superlattice structure is disposed between two of the quantum well layers.