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US 6,649,939 B1Granted
Light-emitting diode with a structured surface
AssigneeOsram Opto Semiconductors GmbH & Co. OHG
InventorRalph Wirth
Life of this patent
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Abstract
For improving the light output, a light-emitting diode has at least one section of a light exit-side surface covered with a plurality of truncated pyramids. Light radiations, which are emitted by a light-generating layer, enter into the truncated pyramids through a base area and are efficiently coupled out of the sidewalls of the pyramids.
Claims20
A light-emitting diode comprising:
- a semiconductor layer structure containing a substrate and at least one light-generating layer formed on the substrate,
- a first electrical contact layer on the substrate and
- a second electrical contact layer on at least one section of a surface of the semiconductor structure lying opposite the substrate,
- the surface of the semiconductor structure lying opposite the substrate being structured over at least one section to have a plurality of truncated elements selected from truncated pyramids and truncated cones outside a region of the second electrical contact layer.
1 more element
A light-emitting diode comprising:
- a semiconductor layer structure containing a substrate and at least one light-generating layer formed on the substrate,
- a first electrical contact layer on the substrate and
- a second electrical contact layer on at least one section of a surface of the semiconductor structure lying opposite the substrate,
- the surface of the semiconductor structure lying opposite the substrate being structured over at least one section to have a plurality of three-sided truncated pyramids that are defined by the following parameter ranges:
- 0.1≦V≦10,
- 45°≦φ≦88°,
- α, β, γ>10°,
- whereby V=A½/h applies and A is an area dimension of a triangular base area of each truncated pyramid and h is the height of the truncated pyramid, φ is the angle of incidence of each sidewall of the truncated pyramids and α, β, γ are the angles of the triangular base area.
5 more elements
Dependencies are inferred from the claim text.