Patent ID: 8598598

Claim:
A light emitting device having vertically stacked light emitting diodes, comprising: a substrate; a first light emitting diode, comprising; 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; 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; a second light emitting diode, comprising: an upper semiconductor layer of the second conductive type positioned on the lower semiconductor layer of the second conductive type and comprising a GaN-based P-type semiconductor layer; an upper semiconductor layer of the first conductive type positioned on the upper semiconductor layer of the second conductive type; and 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, the separating layer electrically separating the first and second light emitting diodes; and a codoped layer interposed between the lower semiconductor layer of the first conductive type and the lower active layer or between the upper semiconductor layer of the second conductive type and the upper active layer.