Patent ID: 6977952
Filing Date: 2005-12-20
Classification: B82Y,H01L,H01S

Abstract:
1. A semiconductor device having a semiconductor multi-layer structure which includes at least one active layer including at least one luminescent layer of In x Al y Ga 1−x−y N (0<x<1, 0≦y≦0.2), and at least a part of said at least one luminescent layer acting as a quantum well, wherein said semiconductor device satisfies at least one of: a first condition that a threshold mode gain of said quantum well is more than 12 cm a second condition that said semiconductor device has an internal loss “α a third condition that said semiconductor device has a slope efficiency “S” (W/A) which satisfies: S<3×{α wherein a differential gain “dg/dn” of said at least one active layer satisfies dg/dn≧1.0×10 standard deviations of microscopic and macroscopic fluctuations in a band gap energy of said at least luminescent layer are not more than 40 meV; and wherein said microscopic fluctuation is measured based on temperature dependence of a photoluminescence lifetime and wherein said microscopic fluctuation is controlled by heat treatment of said semiconductor device at a temperature between 850° C. and 1200° C.