Light emitting device and light emitting device package
Disclosed are a light emitting device and a light emitting device package. The light emitting device includes a substrate including a plurality of patterns, each pattern including three protrusion parts, a plurality of spaces formed between the patterns, and a light emitting device structure over the patterns and the spaces. Each space includes a medium having a refractive index different from a refractive index of the light emitting device structure.
1. A light emitting device comprising:
a substrate including a plurality of patterns, each of the plurality of patterns including a plurality of protrusion sections and a plurality of grooves; and
a light emitting structure over the plurality of patterns and including a first semiconductor layer, an active layer, and a second semiconductor layer, wherein the plurality of protrusion sections extend in different directions and wherein the plurality of grooves are disposed among the plurality of protrusion sections.
2. The light emitting device of claim 1 , further comprising
a plurality of spaces disposed among the plurality of patterns, wherein one or more of the spaces includes a medium having a refractive index different from a refractive index of the light emitting structure.
3. The light emitting device of claim 1 , wherein each pattern includes first to third protrusion sections, and wherein the first to third protrusion sections extend in directions different from each other within one or more horizontal planes.
4. The light emitting device of claim 3 , wherein an end portion of each of the first to third protrusion sections has substantially a rounded convex shape.
5. The light emitting device of claim 3 , wherein:
each of the first to third protrusion sections extend from a branch point,
each of the first to third protrusion sections has a segment adjacent the branch point and an end at a location different from the branch point, and
the segment has at least a width narrower than a width of the end.
6. The light emitting device of claim 3 , wherein each groove has substantially a rounded concave shape.
7. The light emitting device of claim 6 , wherein angles separate adjacent ones of the first to third protrusion sections and wherein the angles are substantially the same as each other.
8. The light emitting device of claim 7 , wherein angles separate adjacent ones of the first to third protrusion sections and wherein the angles are different from each other.
9. The light emitting device of claim 8 , wherein the angle between two adjacent protrusion sections is less than or substantially equal to 120°.
10. The light emitting device of claim 1 , wherein the plurality of patterns extend from a surface of the substrate in a direction different from the different directions in which the protrusion sections extend.
11. The light emitting device of claim 1 , wherein a width of at least one of the grooves is in a range of about 0.1 um to about 1 um.
12. The light emitting device of claim 1 , wherein a distance between adjacent ones of the patterns is in a range of about 0.1 um to about 1 um.
13. The light emitting device of claim 1 , wherein the plurality of patterns are arranged in substantially a matrix shape or substantially a zigzag shape.
14. The light emitting device of claim 1 , wherein the plurality of patterns are arranged in substantially an oblique direction.
15. The light emitting device of claim 1 , wherein the plurality of patterns are randomly arranged.
16. The light emitting device of claim 1 , wherein heights of the grooves are smaller than or equal to a thickness of one or more of the patterns.
17. The light emitting device of claim 1 , further comprising:
a plurality of spaces disposed between the plurality of patterns respectively,
wherein one or more of the spaces includes a medium having a refractive index different from a refractive index of the light emitting structure.
18. The light emitting device of claim 1 , wherein the different directions extend in one or more planes that are substantially parallel to a direction in which the substrate extends.
19. The light emitting device of claim 18 , wherein the one or more planes are horizontal planes.
20. The light emitting device of claim 18 , wherein the plurality of protrusion sections extend from the substrate in a direction which crosses said one or more planes.
21. The light emitting device of claim 1 , wherein the plurality of protrusion sections extend in substantially a same plane.
22. The light emitting device of claim 2 , wherein the medium is air.
23. The light emitting device of claim 17 wherein at least one of the plurality of spaces includes one of the grooves.
24. The light emitting device of claim 1 , wherein at least one of the plurality of protrusion sections from one of the plurality of patterns is disposed in opposing relation to one of the grooves in another one of the plurality of patterns.
25. A light emitting device comprising:
a substrate; and
a plurality of patterns arranged over the substrate,
wherein each of the plurality of patterns comprises:
a plurality of protrusion sections that extend in different directions,
a plurality of spaces formed among the plurality of patterns; and
a light emitting structure disposed over the substrate and including a first semiconductor layer, an active layer, and a second semiconductor layer, wherein the light emitting structure is disposed over the plurality of patterns and the plurality of spaces,
wherein each of the plurality of spaces includes a medium having a refractive index different from a refractive index of the light emitting structure, and wherein at least one of the plurality of spaces is formed between one protrusion section of one of the plurality of patterns and two protrusion sections of another one of the plurality of patterns.
26. A light emitting device package comprising:
a body;
first and second electrode layers over the body;
a light emitting device electrically connected to the first and second electrode layers over the body; and
a molding material surrounding the light emitting device over the body,
wherein each light emitting device comprises:
a plurality of patterns, each of the plurality of patterns including a plurality of protrusion sections that extend in different directions and a plurality of grooves among the plurality of protrusion sections;
a plurality of spaces formed among the plurality of patterns; and
a light emitting structure disposed over the plurality of patterns and the plurality of spaces and including a first semiconductor layer, an active layer, and a second semiconductor layer, and wherein one or more of the plurality of spaces includes a medium having a refractive index different from a refractive index of the light emitting structure.