Patent ID: 7339195
Filing Date: 2008-03-04
Classification: B82Y,H01L,H01S

Abstract:
1. A semiconductor light emitting device comprising: an active layer made of a first nitride III-V compound semiconductor containing In and Ga; an optical guide layer in contact with the active layer and made of a second nitride III-V compound semiconductor containing Ga; a cap layer in contact with the optical guide layer and made of a third nitride III-V compound semiconductor containing Al and Ga; and a p-type clad layer in contact with the cap layer and made of a fourth nitride III-V compound semiconductor containing Al and Ga and different from the third nitride III-V compound semiconductor, wherein, the p-type clad layer composes a superlattice clad layer and is effective to confine light from the active layer, and the cap layer at all points has a band gap larger than that of the p-type clad layer, and the thickness of the cap layer is equal to or more than 2 nm and equal to or less than 20 nm.