Patent ID: 8450762

Claim:
A light emitting device comprising: a conductive substrate; a dielectric layer over the conductive substrate; a light emitting structure above the dielectric layer, wherein the light emitting structure comprises a first conductive semiconductor layer, a second conductive semiconductor layer, and an active layer between the first conductive semiconductor layer and the second conductive semiconductor layer; a contact layer between the light emitting structure and the dielectric layer, an insulating layer between the contact layer and the light emitting structure, wherein the contact layer comprises a first protrusion penetrating into a portion of the light emitting structure, wherein the first protrusion of the contact layer extends into a portion of the first conductive semiconductor layer through the second conductive semiconductor layer and the active layer, and wherein: a top surface of the first protrusion of the contact layer is in direct contact with the portion of the first conductive semiconductor layer, the dielectric layer comprises a second protrusion which extends into the light emitting structure, the second protrusion of the dielectric layer is in direct contact with the first protrusion of the contact layer, and the insulating layer is disposed between the first protrusion of the contact layer and the light emitting structure.