Patent ID: 7627009

Claim:
A light-emitting device, comprising: an n-type InP substrate doped with sulfur and having an etch pit density less than 100 cm −2 at a primary surface thereof; an optical guiding portion provided on the primary surface of the InP substrate, the optical guiding portion forming a mesa structure included with an active layer therein; a current blocking portion provided in both sides of the optical guiding portion so as to bury the mesa structure of the optical guiding portion, the current blocking portion including a first p-type semiconductor layer made of InP based material, an n-type semiconductor layer made of InP based material, and a second p-type semiconductor layer made of InP based material; and an n-type layer doped with silicon (Si) and provided between the active layer and the n-type InP substrate, and between the first p-type semiconductor layer of the current blocking portion and the n-type InP substrate.