Patent ID: 8164106

Claim:
A light emitting diode comprising: a laminate including an n-type cladding layer, an emission layer which has a quantum well structure having a well layer and a barrier layer, an intermediate layer and a p-type cladding layer in this order; wherein the composition of each of the layers is represented by the composition formula: (Al X Ga 1-X ) Y In 1-Y P (0≦X≦1, 0<Y≦1), the composition of the barrier layer is represented by the composition formula: (Al X Ga 1-X ) Y In 1-Y P (0.5≦X≦1, 0<Y≦1), the intermediate layer is an undoped layer and has the composition of (Al X Ga 1-X ) Y In 1-Y P (0.6≦X≦1, 0<Y≦1), and the Al composition (X) of the intermediate layer is equal to or greater than the Al composition (X) of the barrier layer, but is smaller than the Al composition (X) of the cladding layers.