Semiconductor light emitting device with light extraction surface
First Claim
Patent Images
1. A semiconductor light emitting device comprising:
- a semiconductor stack comprising an n-type semiconductor layer, a p-type semiconductor layer, and a light emitting layer between the n-type semiconductor layer and the p-type semiconductor layer,wherein the semiconductor stack includes at least one concave structure,wherein the concave structure has two slopes each having a different slope angle in a direction that a diameter of the concave structure becomes narrower toward a bottom of the concave structure from an opening of the concave structure,wherein an upper surface of the semiconductor stack includes a higher planar portion outside the concave structure and a lower surface of the semiconductor stack includes a lower planar portion inside the concave structure,wherein the two slopes connect the higher planar portion to the lower planar portion,wherein a slope, of the two slopes, having a gentler slope angle is provided with irregularities and a slope, of the two slopes, having a steeper slope angle is a flat surface, andwherein a depth of the concave structure has a length not less than half of a thickness between the upper surface and a top surface of the light emitting layer and less than the thickness between the upper surface and the top surface of the light emitting layer.
1 Assignment
0 Petitions
Accused Products
Abstract
A semiconductor light emitting device which includes at least one concave on a light extraction surface opposite to a surface on which a semiconductor stack comprising a light emitting layer between a n-type semiconductor layer and a p-type semiconductor layer is mounted. The concave has not less than two slopes each having a different slope angle in a direction that a diameter of the concave becomes narrower toward a bottom of the concave from an opening of the concave and a slope having a gentle slope angle is provided with irregularities and a slope having a steep slope angle is a flat surface.
15 Citations
9 Claims
-
1. A semiconductor light emitting device comprising:
-
a semiconductor stack comprising an n-type semiconductor layer, a p-type semiconductor layer, and a light emitting layer between the n-type semiconductor layer and the p-type semiconductor layer, wherein the semiconductor stack includes at least one concave structure, wherein the concave structure has two slopes each having a different slope angle in a direction that a diameter of the concave structure becomes narrower toward a bottom of the concave structure from an opening of the concave structure, wherein an upper surface of the semiconductor stack includes a higher planar portion outside the concave structure and a lower surface of the semiconductor stack includes a lower planar portion inside the concave structure, wherein the two slopes connect the higher planar portion to the lower planar portion, wherein a slope, of the two slopes, having a gentler slope angle is provided with irregularities and a slope, of the two slopes, having a steeper slope angle is a flat surface, and wherein a depth of the concave structure has a length not less than half of a thickness between the upper surface and a top surface of the light emitting layer and less than the thickness between the upper surface and the top surface of the light emitting layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
Specification