Patent ID: 8624220
Filing Date: 2014-01-07
Classification: H01L

Abstract:
1. A nitride semiconductor comprising: a one conductivity type nitride semiconductor part; a quantum well active layer structure part; and a another conductivity type nitride semiconductor part opposite to said one conductivity type, which are stacked in this order on a nitride principal surface of a base having nonpolar nitride at least on one of principal surface, wherein said one conductivity type nitride semiconductor part comprises a first nitride semiconductor layer and a second nitride semiconductor layer, which are stacked in this order, said second nitride semiconductor layer has a thickness of 400 nm to 20 μm and has a substantially nonpolar outermost surface, wherein an emissive recombination lifetime (τ(R)) of said quantum well active layer structure part as determined by time-resolved PL measurement at room temperature under low excitation density condition is shorter than a non-emissive recombination lifetime (τ(NR)).