Patent ID: 6900467

Claim:
A semiconductor light emitting device comprising: (i) a support substrate made of a first semiconductor material; (ii) a light emitting lamination structure disposed on the support substrate, the light emitting lamination structure comprising: a quantum well layer made of a second semiconductor material, a pair of carrier confinement layers made of a third semiconductor material having a band gap wider than a band gap of the second semiconductor material, said pair of carrier confinement layers sandwiching the quantum well layer, and a pair of clad layers made of a fourth semiconductor material having a band gap wider than the band gap of the third semiconductor material, said pair of clad layers sandwiching the pair of carrier confinement layers, wherein a composition of the second semiconductor material, a composition of the third semiconductor material and a thickness of the quantum well layer are set such that a difference of at least 100 meV exists between an energy level of the carrier confinement layers at a conduction band lower end and a ground level of an electron in the quantum well layer; and (iii) electrodes for injecting carriers into the light emitting lamination structure.