Light-emitting element having a reflective structure with high efficiency
View Patent ↗A light-emitting device comprises a light-emitting stack; a reflective structure comprising a reflective layer on the light-emitting stack and a first insulating layer covering the reflective layer; and a first conductive layer on the reflective structure; wherein the first insulating layer isolates the reflective layer from the first conductive layer.
1. A light-emitting device, comprising: a light-emitting stack; a reflective structure comprising a reflective layer on the light-emitting stack, a first insulating layer covering the reflective layer and a first transparent layer between the reflective layer and the light-emitting stack; a window layer with a rough surface; and a first conductive layer on the reflective structure; wherein the first insulating layer electrically isolates the reflective layer from the first conductive layer, and wherein the first transparent layer comprises a plurality of rods formed on the light-emitting stack, wherein the light-emitting stack comprises a first semiconductor layer, an active layer located on the first semiconductor layer and a second semiconductor layer located on the active layer, wherein a portion of the first semiconductor layer is exposed from the active layer and the second semiconductor layer.
2. The light-emitting device according to claim 1 , wherein the first transparent layer comprises a cavity.
3. The light-emitting device according to claim 1 , further comprising a plurality of channels in the reflective layer and in the first insulating layer.
4. The light-emitting device according to claim 3 , wherein the first conductive layer electrically contacts the light-emitting stack through one of the plurality channels of channel.
5. The light-emitting device according to claim 3 , further comprising a first contact layer in one of the plurality of channels and contacting the first conductive layer.
6. The light-emitting device according to claim 1 , further comprising a second conductive layer on the reflective structure.
7. The light-emitting device according to claim 6 , wherein the second conductive layer electrically contacts the first semiconductor layer.
8. The light-emitting device according to claim 7 , further comprising a second contact layer contacting the second conductive layer and the first semiconductor layer.
9. The light-emitting device according to claim 6 , wherein the second conductive layer and the first conductive layer are separated from each other.
10. The light-emitting device according to claim 1 , wherein the reflective structure further comprises a second transparent layer between the reflective layer and the first transparent layer.
11. The light-emitting device according to claim 1 , further comprising a substrate under the light-emitting stack.