Patent ID: 6979835

Claim:
A GaN-based LED structure, comprising: a substrate made of a material selected from the group consisting of sapphire, 6H—SiC, 4H—SiC, Si, ZnO, GaAs, MgAl 2 O 4 , and an oxide monocrystalline having a lattice constant compatible with that of nitrides; an n-type contact layer made of an n-type GaN material on top of an upper side of said substrate; a lower barrier layer on top of a part of said n-type contact layer's upper surface; an active layer on top said first barrier layer; an upper barrier layer on top of said active layer; a p-type contact layer made of an Mg-doped GaN material on top of said upper barrier layer; a positive electrode having an ohmic contact with and located on top of said p-type contact layer; and a negative electrode having an ohmic contact with and located on top of another part of said n-type contact layer's upper surface not covered by said fist barrier layer, wherein each of said lower and upper barrier layers further comprises a first AlGaInN layer having a wider band gap than that of said active layer, a SiN layer, and a second AlGaInN layer having a wider band gap than that of said active layer, sequentially stacked from bottom to top in this order.