Light emitting device and method of manufacturing the same
View Patent ↗The present invention relates to a light emitting device. The light emitting device comprises a substrate, an N-type semiconductor layer formed on the substrate, and a P-type semiconductor layer formed on the N-type semiconductor layer, wherein a side surface including the N-type or P-type semiconductor layer has a slope of 20 to 80° from a horizontal plane. Further, a light emitting device comprises a substrate formed with a plurality of light emitting cells each including an N-type semiconductor layer and a P-type semiconductor layer formed on the N-type semiconductor layer, wherein the N-type semiconductor layer of one light emitting cell and the P-type semiconductor layer of another adjacent light emitting cell are connected to each other, and a side surface including at least the P-type semiconductor layer of the light emitting cell has a slope of 20 to 80° from a horizontal plane.
1. A light emitting device, comprising:
a plurality of light emitting cell each comprising an N-type semiconductor layer, a P-type semiconductor layer disposed on the N-type semiconductor layer and an active layer interposed between the N-type semiconductor layer and the P-type semiconductor layer, wherein the active layer and the P-type semiconductor layer cover a portion of a top surface of the N-type semiconductor layer, such that the top surface of the N-type semiconductor layer is partially exposed;
a first insulation layer covering the plurality of light emitting cells, and comprising openings which expose at least partial top surfaces of the N-type semiconductor layer and the P-type semiconductor layer;
an ohmic contact layer contacting the N-type semiconductor layer through the opening, and
a second insulation layer covering the ohmic contact layer and the first insulation layer,
wherein the ohmic contact layer at least partially covers the first insulation layer,
wherein the second insulation layer has a substantially constant thickness with respect to surfaces of the plurality of light emitting cells, and
wherein side surface of the P-type semiconductor layer and the active layer are inclined.
2. The light emitting device of claim 1 , wherein the ohmic contact layer is arranged between the active layer of one light emitting cell and the active layer of another light emitting cell.
3. The light emitting device of claim 1 , further comprising a substrate on which the plurality of light emitting cell are disposed.
4. The light emitting device of claim 3 , wherein the substrate is transparent.
5. The light emitting device of claim 1 , further comprising a metal bump arranged on at least a partial portion of the ohmic contact layer.
6. The light emitting device of claim 5 , wherein the metal bump is directly contacted to at least the partial portion of the ohmic contact layer.
7. The light emitting device of claim 3 , wherein side surfaces of the P-type semiconductor layer, the active layer, and the N-type semiconductor layer are inclined 20-80 degrees, with respect to a plane of the substrate.
8. The light emitting device of claim 1 , wherein the second insulation layer is formed by a CVD process.