Patent ID: 7067838

Claim:
A gallium-nitride-based light-emitting apparatus comprising: a substrate; a first-conducting-type clad layer formed on the substrate; an active layer formed on the first-conducting-type clad layer; and a second-conducting-type clad layer formed on the active layer, the active layer including barrier layers and well layers made of a gallium-nitride-based compound semiconductor, wherein the barrier layers of the active layer include a first barrier layer formed toward the first-conducting-type clad layer and second barrier layers sandwiched by the well layers, the light-emitting apparatus comprises a second-conducting-type carrier block layer between the active layer and the second-conducting-type clad layer, and the band gap Egb of the second-conducting-type carrier block layer, the band gap Eg 2 of the second barrier layers, the band gap Eg 1 of the first barrier layer, and the band gap Egc of the clad layers satisfy the relationship Egb>Eg 2 >Eg 1 >Egc.