Light-emitting element and the manufacturing method thereof
View Patent ↗A light-emitting element includes: a substrate being a monocrystalline structure, comprising a plurality of recesses; and a plurality of first light-emitting stacks formed in the recesses respectively.
1. A light-emitting element comprising:
a substrate of a monocrystalline structure, comprising a plurality of recesses, each recess comprising a bottom surface and a side surface; and
a plurality of first light-emitting stacks, each first light-emitting stack comprising an epitaxial layer substantially parallel with the bottom surface and directly contacting the bottom surface and the side surface.
2. The light-emitting element of claim 1 , wherein the substrate comprises a base portion and at least a protrusion portion protruded from the base portion defining the plurality of recesses.
3. The light-emitting element of claim 2 , wherein the base portion comprises an uneven surface.
4. The light-emitting element of claim 1 , wherein each of the first light-emitting stacks comprises two contact regions on the same side of the substrate.
5. The light-emitting element of claim 4 , further comprising a conductive structure electrically connecting a first contact region of one first light-emitting stack to a second contact region of another first light-emitting stack.
6. The light-emitting element of claim 2 , further comprising a second light-emitting stack formed on the protrusion portion.
7. The light-emitting element of claim 6 , wherein each of the first light-emitting stacks and the second light-emitting stacks comprise two contact regions on the same side of the substrate.
8. The light-emitting element of claim 7 , wherein the distance between the top of the first light-emitting stack and the top surface of each of the protrusion portion is between 5 and 20 μm.
9. The light-emitting element of claim 6 , further comprising a conductive structure connecting the first light-emitting stack and the second light-emitting stack, wherein the second light-emitting stack comprises an active layer for emitting light, and the active layer comprises a side surface covered by the conductive structure.
10. The light-emitting element of claim 9 , further comprising an insulating layer between the second light-emitting stack and the conductive structure.
11. The light-emitting element of claim 2 , wherein the width of the protrusion portion is between 35 μm and 250 μm.
12. The light-emitting element of claim 1 , wherein the dielectric constant of the substrate is greater than 7.8.
13. The light-emitting element of claim 2 , wherein a width of one of the base portions is substantially the same as a width of the first light-emitting stack formed thereon.
14. The light-emitting element of claim 2 , wherein each of the first light-emitting stacks comprises a conductive structure electrically connecting one first light-emitting stack to an another first light-emitting stack and electrically isolated from the protrusion portion of the substrate.
15. The light-emitting element of claim 2 , wherein the base portion and the protrusion portion are an integral whole.
16. The light-emitting element of claim 2 , wherein there is no space between the first light-emitting stack and the protrusion portion.
17. The light-emitting element of claim 5 , wherein the conductive structure upwardly extends along the side surface of the substrate.
18. The light-emitting element of claim 5 , wherein the conductive structure strides over a protrusion portion the substrate.
19. The light-emitting element of claim 6 , wherein the protrusion portion and the second light-emitting stack substantially have a same width.