Patent ID: 7301272

Claim:
A lighting device, comprising: a substrate; a semiconductor layer of a first electrical property, located on the substrate, wherein the semiconductor layer of the first electrical property has a mesa; an active layer, located on the mesa of the semiconductor layer of the first electrical property; a semiconductor layer of a second electrical property, located on the active layer; a transparent contact layer, located on the semiconductor layer of the second electrical property, wherein the mesa of the semiconductor layer of the first electrical property, the active layer, the semiconductor layer of the second electrical property and the transparent contact layer form a stack structure; a passivation layer, covering the stack structure and a first part of the semiconductor layer of the first electrical property adjacent to the stack structure, wherein the passivation layer has a first opening to expose part of the transparent contact layer; an electrode of a second electrical property, located in the first opening and covering the part of the transparent contact layer; and a guard ring, wherein the guard ring extends from the electrode of the second electrical property to the passivation layer located on the first part of the semiconductor layer of the first electrical property and has an opening.