Patent ID: 11637220

Abstract:
A semiconductor light-emitting element comprises, in this order, a substrate, a reflective layer, a first conductivity type cladding layer made of InGaAsP containing at least In and P, a semiconductor light-emitting layer having an emission central wavelength of 1000 nm to 2200 nm and a second conductivity type cladding layer made of InGaAsP containing at least In and P, the second conductivity type cladding layer being configured to be on a light extraction side, a surface of a light extraction face of the second conductivity type cladding layer being a roughened surface which has a surface roughness Ra of 0.03 μm or more and has a random irregularity pattern. The surface of the light extraction face has a skewness Rsk of −1 or more, and a protective film is provided on the light extraction face.