Patent ID: 7589346
Filing Date: 2009-09-15
Classification: H01L,H04N

Abstract:
1. A GaN based semiconductor light-emitting device comprising: a first GaN based compound semiconductor layer of an n-conductivity type; an active layer; a second GaN based compound semiconductor layer; an underlying layer composed of a GaN based compound semiconductor, the underlying layer being disposed between the first GaN based compound semiconductor layer and the active layer, wherein the underlying layer and the active layer each contain In, and the underlying layer has an In content less than an In content of the active layer; a lower spacer layer composed of an undoped GaN based compound semiconductor, the lower spacer layer having a thickness of 50 nm or less and being disposed between the active layer and the underlying layer; and a superlattice layer composed of a GaN based compound semiconductor doped with a p-type dopant, the superlattice layer being disposed between the active layer and the second GaN based compound semiconductor layer, the superlattice layer having a structure in which a plurality of a first type of GaN based layers are stacked periodically and alternately with a plurality of a second type of GaN based layers.