Patent ID: 8126024

Claim:
An optical device configured to emit electromagnetic radiation of about 500 nm and greater comprising: a gallium nitride substrate member having a nonpolar crystalline surface region; an n-GaN cladding layer overlying the surface region, the n-GaN cladding layer having a thickness from 100 nm to 3000 nm and a Si doping level of 5E17 to 3E18 cm-3; an n-side SCH layer overlying the n-GaN cladding layer, the n-side SCH layer comprised of InGaN and having a molar fraction of indium of between 3% and 7% and a thickness from 40 to 60 nm; a multiple quantum well active region overlying the n-side SCH layer, the multiple quantum well active region comprising seven 3.5-4.5 nm InGaN quantum wells separated by eight 9.5-10.5 nm GaN barriers; a p-side SCH layer overlying the multiple quantum well active region, the p-side SCH layer comprised of InGaN with molar a fraction of indium of between 2% and 5% and a thickness from 15 nm to 25 nm; an electron blocking layer overlying the p-side SCH layer, the electron blocking layer comprised of AlGaN with molar fraction of aluminum of between 15% and 22% and a thickness from 10 nm to 15 nm and doped with Mg; a p-GaN cladding layer overlying the electron blocking layer, the p-GaN cladding layer having a thickness from 400 nm to 1000 nm with Mg doping level of 5E17 cm-3 to 1E19 cm-3; and a p++-GaN contact layer overlying the p-GaN cladding layer, the p++-GaN contact layer having a thickness from 20 nm to 40 nm with Mg doping level of 1E20 cm-3 to 1E21 cm-3.