Patent ID: 6707074
Filing Date: 2004-03-16
Classification: H01L,H01S

Abstract:
A semiconductor light-emitting device comprising:first and second semiconductor layers each of a first conductivity type; a third semiconductor layer of a second conductivity type provided between the first and second semiconductor layers; an active layer provided between the second and third semiconductor layers, the active layer emitting light with charge injected therein from the second and third semiconductor layers; and a graded composition layer provided between the active layer and the third semiconductor layer to have a varying composition, wherein the composition of the graded composition layer is equal to a composition of the third semiconductor layer at an interface with the third semiconductor layer, and to a composition of the active layer at an interface with the active layer, wherein a base electrode is electrically connected to the third semiconductor layer via the graded composition layer and the active layer, and wherein the forbidden band of the active layer is smaller than the forbidden band of the third semiconductor layer.