Patent ID: 8803174

Claim:
A light emitting device comprising: a nitride semiconductor layer; an electrode on a top surface of the nitride semiconductor layer; a light emitting structure under a bottom surface of the nitride semiconductor layer, the light emitting structure including a first conductive type semiconductor layer at the bottom surface of the nitride semiconductor layer, a second conductive type semiconductor layer, and an active layer between the first and the second conductive type semiconductor layers; and a conductive layer under a bottom surface of the light emitting structure, wherein the nitride semiconductor layer has a band gap energy lower than a band gap energy of the first conductive type semiconductor layer, wherein the nitride semiconductor layer is directly contacted with a top surface of the first conductive type semiconductor layer, wherein the electrode is directly contacted with the nitride semiconductor layer and the first conductive type semiconductor layer, wherein a top surface of the conductive layer is directly contacted with a bottom surface of the second conductive type semiconductor layer, wherein the nitride semiconductor layer includes a semiconductor having a compositional formula of In x Al y Ga 1-x-y N (0.15<x<1, 0<y<0.15, 0<x+y<1), wherein the first conductive type semiconductor layer includes an n-type semiconductor layer and the second conductive type semiconductor layer includes a p-type semiconductor layer, wherein the nitride semiconductor layer is formed of a semiconductor layer having a conductivity lower than that of the first conductive type semiconductor layer.