Patent ID: 9484496
Filing Date: 2016-11-01
CPC Classification: H01L

Claim Text:
1. A light emitting device comprising: a metal layer; a light emitting structure on the metal layer, including a first semiconductor layer, a second semiconductor layer between the first semiconductor layer and the metal layer, and an active layer between the first semiconductor layer and the second semiconductor layer; a reflective layer between the metal layer and the light emitting structure; a contact layer between the reflective layer and the light emitting structure; and a first electrode on the first semiconductor layer of the light emitting structure, wherein the first semiconductor layer of the light emitting structure has a stepped structure at an edge region of an upper portion of the first semiconductor layer, wherein a lower portion of the first semiconductor layer has an outer lateral surface inclined with respect to a bottom surface of the first semiconductor layer, wherein an interior angle between the outer lateral surface and the bottom surface of the first semiconductor layer is an obtuse angle, wherein the first semiconductor layer is an n-type semiconductor layer and the second semiconductor layer is a p-type semiconductor layer, wherein the stepped structure includes a lateral surface extended downward from a top surface of the first semiconductor layer and a bottom surface extended outward from the lateral surface of the stepped structure, wherein the outer lateral surface of the lower portion of the first semiconductor layer is inclined from the bottom surface of the stepped structure with respect to the bottom surface of the first semiconductor layer, wherein the first semiconductor layer includes a plurality of recesses, wherein each of the plurality of recesses has a depth smaller than a vertical height of the stepped structure, wherein the vertical height of the stepped structure is a distance between the top surface of the first semiconductor layer and the bottom surface of the stepped structure, wherein a length of the top surface of the first semiconductor layer has a length smaller than a length of the bottom surface of the first semiconductor layer, wherein the active layer and the second semiconductor layer have an outer lateral surface inclined with respect to a bottom surface of the second semiconductor layer, and wherein an interior angle between the outer lateral surface of the second semiconductor layer and the bottom surface of the second semiconductor layer is an obtuse angle.