Patent ID: 8610105

Claim:
A semiconductor electroluminescent device comprising: a substrate; and a multiple-quantum well layer formed above the substrate, the multiple-quantum well layer including In 1-x-y Ga x Al y As-based well layers and In 1-x-y Ga x Al y As-based barrier layers which are alternately disposed, the well layers each having tensile strain, the barrier layers each having compressive strain, wherein (1−x−y) is 0.21-0.44, and wherein the semiconductor electroluminescent device is configured to output light having a wavelength in a 1.3 μm band; wherein a magnitude of an interface strain at an interface between each of the well layers and each of the barrier layers is smaller than a magnitude of a critical interface strain as determined by a layer thickness value, which is the larger of a thickness of the well layer and a thickness of the barrier layer adjacent to each other with the interface therebetween, and wherein the magnitude of the critical interface strain is determined based on a largest strain amount, the largest strain amount being determined by Matthews' formula.