Patent ID: 8237174

Claim:
A light emitting diode structure, comprising: a substrate; an N-type semiconductor layer formed on the substrate; a light emitting layer formed on the N-type semiconductor layer; and a P-type semiconductor layer formed on the light emitting layer, wherein the N-type semiconductor layer includes at least one N-type current spreading layer able to uniformly distribute current flowing through the N-type semiconductor layer; the N-type current spreading layer further includes at least three sub-layers, each sub-layer is expressed by a general formula In x Al y Ga (1-x-y) N, and wherein 0≦x≦1, 0≦y≦1, and 0≦x+y≦1; the three sub-layers are stacked in a sequence of from a lower band gap to a higher band gap, and the sub-layer having the lower band gap is near the substrate, and the sub-layer having the higher band gap is near the light emitting layer.