Patent ID: 7105850

Claim:
A GaN LED structure comprising: a substrate having a material selected from the group of sapphire, SiC, Si, ZnO, GaAs, MgAl 2 O 4 and a single-crystal oxide with a lattice constant close to an N-Compound semiconductor; an Al 1−x−y Ga x In y N buffer layer with 0≦X<1, 0≦Y<1 and X+Y≦1 on top of said substrate; an n-type GaN layer on top of said Al 1−x−y Ga x In y N buffer layer; an InGaN active layer on top of said n-type GaN layer; a p-type shielding layer having p-type Al 1−x In x N with 0<X<1 and a thickness between 50Å and 3000Å on top of said active layer; and a p-type contacting layer having Al—Mg-codoped In y Ga 1−y N with 0≦Y<1 and a thickness between 200Å and 3000Å on top of said p-type shielding layer.