Patent ID: 8089074
Filing Date: 2012-01-03
Classification: H01L

Abstract:
1. A light emitting device having vertically stacked light emitting diodes, comprising: a substrate consisting of sapphire or SiC; a lower semiconductor layer of a first conductive type positioned on the substrate; a lower semiconductor layer of a second conductive type positioned on the lower semiconductor layer of the first conductive type; an upper semiconductor layer of the second conductive type positioned on the lower semiconductor layer of the second conductive type; an upper semiconductor layer of the first conductive type positioned on the upper semiconductor layer of the second conductive type; a lower active layer interposed between the lower semiconductor layer of the first conductive type and the lower semiconductor layer of the second conductive type; an upper active layer interposed between the upper semiconductor layer of the second conductive type and the upper semiconductor layer of the first conductive type; a separating layer interposed between the lower semiconductor layer of the second conductive type and the upper semiconductor layer of the second conductive type; first cladding layers between which the lower active layer is interposed; second cladding layers between which the upper active layer is interposed; a first-type lower electrode formed on a first region of the lower semiconductor layer of the first conductive type; a second-type lower electrode formed on a first region of the lower semiconductor layer of the second conductive type; a second-type upper electrode formed on a first region of the upper semiconductor layer of the second conductive type; and a first-type upper electrode formed on the upper semiconductor layer of the first conductive type, wherein the lower semiconductor layer of the second conductive type is positioned on a second region of the lower semiconductor layer of the first conductive type, the upper semiconductor layer of the second conductive type is positioned on a second region of the lower semiconductor layer of the second conductive type, and the upper semiconductor layer of the first conductive type is positioned on a second region of the upper semiconductor layer of the second conductive type, the first cladding layers are interposed between the lower semiconductor layer of the first conductive type and the lower semiconductor layer of the second conductive type, the second cladding layers are interposed between the upper semiconductor layer of the first conductive type and the upper semiconductor layer of the second conductive type, and the lower active layer is the only active layer disposed between the substrate and the separating layer, and the lower active layer and the upper active layer are (B, Al, In, Ga)N based semiconductors.