Patent ID: 8416825

Claim:
An optical device configured to emit electromagnetic radiation of more than about 500 nm wavelength comprising: a gallium nitride substrate having a nonpolar crystalline surface region; an n-GaN cladding layer overlying the surface region, the n-GaN cladding layer having a thickness between 100 nm and 3000 nm and a Si doping level between 1E17 to 5E19 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 between 3% and 7%, and a thickness between 20 and 150 nm; a multiple quantum well active region overlying the n-side SCH layer, the multiple quantum well active region comprising a plurality of 3.5-7.5 nm InGaN quantum wells separated by 1.5-7.5 nm GaN or InGaN barriers; a p-type cladding layer overlying the multiple quantum well active region, the p-type cladding layer having a thickness between 400 nm and 1000 nm with a Mg doping level between 5E17 cm-3 to 5E19 cm-3; a p++-type contact layer overlying the p-type cladding layer, the p++-type contact layer having a thickness between 10 nm and 50 nm with a Mg doping level between 5E19 cm-3 and 1E21 cm-3; and a p-side SCH region overlying the multiple quantum well region, where the p-side SCH region is comprised of InGaN with 0 to 7% molar fraction of InN and has a thickness between 5 nm and 70 nm.