Patent ID: 7087924

Claim:
A gallium-nitride (GaN) based light emitting diode structure with enhanced light illuminance, comprising: a substrate made of Sapphire; a buffer layer formed on the said substrate and made of aluminum-gallium-indium-nitride (Al 1-x-y Ga x In y N), wherein 0≦x,1, 0≦y<1, and x+y≦1; an n-type gallium nitride (GaN) layer formed on the said buffer layer; an active light-emitting-layer formed on the n-type gallium-nitride(GaN) layer and made of indium-gallium-nitride (InGaN); a p-type cladding layer formed on the said active light-emitting-layer and made of Mg-doped aluminum-indium-nitride (Al 1-x In x N), wherein 0≦x<1; a p-type contact layer formed on the p-type cladding layer and made of gallium-nitride (GaN); a short-period super-lattice barrier buffer layer formed on the p-type contact layer and made of magnesium-nitride/indium-gallium-nitride (MgN/In x Ga 1-x N); a transparent contact layer formed on the short-period super-lattice barrier buffer layer and made of indium-tin-oxide (ITO); and an n-type electrode layer formed on n-type gallium nitride (GaN) layer and made of Ti/Al or Cr/Au.