Patent ID: 8054862

Claim:
A device comprising: a first conductivity type cladding layer including a first barrier layer made of a nitride semiconductor having a composition of In y Ga 1-y N, wherein 0≦y≦0.3; an active layer formed on the first conductivity type cladding layer, the active layer including a well layer made of a nitride semiconductor, wherein the well layer is made of a nitride semiconductor having a composition of In x Ga 1-x N, where 0≦x≦0.3 or 0.34≦x≦0.47; and a second conductivity type cladding layer formed on the active layer and including a second barrier layer made of a nitride semiconductor having a composition of In y Ga 1-y N, wherein 0≦y ≦0.3, wherein the active layer is positioned between and adjacent to the first barrier layer and the second barrier layer; and wherein the first barrier layer and the second barrier layer are configured to cancel or reduce the strain and/or piezo field in the active layer.