Light-emitting device
A light-emitting device is introduced herein. The light-emitting device comprises a first light-generating active layer and a second light-generating active layer stacked in a vertical direction on a substrate wherein the first light-generating active layer and the second light-generating active layer emit light having substantially the same wavelength, and wherein the substrate, the first light-generating active layer, and the second light-generating active layer are formed together in a chip.
1. A light-emitting device comprising:
a substrate;
a first light-generating active layer and a second light-generating active layer stacked in a vertical direction on the substrate wherein the first light-generating active layer and the second light-generating active layer emit light having substantially the same wavelength; wherein the substrate, the first light-generating active layer, and the second light-generating active layer are formed together in a chip; and
wherein each of the first light-generating active layer and the second light-generating active layer comprises a p-type layer and an n-type layer, wherein the stacked first and second light-generating active layers are bonded to the substrate.
2. The light-emitting device of claim 1 , wherein the first light-generating active layer and the second light-generating active layer are electrically connected in series.
3. The light-emitting device of claim 1 , wherein the first light-generating active layer and the second light-generating active layer are electrically connected in parallel.
4. The light-emitting device of claim 1 , further comprising a conductive connection layer interposed between the first light-generating active layer and the second light-generating active layer.
5. The light-emitting device of claim 4 , wherein the conductive connection layer is pervious to light.
6. The light-emitting device of claim 4 , wherein the first light-generating active layer and the second light-generating active layer are electrically connected in series by the conductive connection layer.
7. The light-emitting device of claim 1 , wherein the first light-generating active layer and the second light-generating active layer are monolithically formed on the substrate.
8. The light-emitting device of claim 1 , further comprising a plurality of electrodes electrically connected to the first light-generating active layer and the second light-generating active layer such that the first light-generating active layer and the second light-generating active layer are capable of being independently controlled.
9. The light-emitting device of claim 1 , wherein the first light-generating active layer and the second light-generating active layer take turns to emit light during the positive and negative half cycles of alternating current.