Semiconductor light emitting device with light extraction structures
First Claim
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1. A device comprising:
- a semiconductor structure comprising a light emitting layer disposed between an n-type region and a p-type region, wherein light exits a top side of the semiconductor structure through the n-type region;
a reflective metal contact disposed on a bottom side of the semiconductor structure and electrically connected to the p-type region; and
an oxide disposed between the reflective metal contact and the p-type region, wherein light generated internal to the semiconductor structure at less than a certain angle is reflected off the oxide by total internal reflection toward the top side, and wherein light generated internal to the semiconductor structure passing through the oxide is reflected toward the top side by the reflective metal contact;
wherein at least a portion of the top side of the semiconductor structure is textured.
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Abstract
Structures are incorporated into a semiconductor light emitting device which may increase the extraction of light emitted at glancing incidence angles. In some embodiments, the device includes a low index material that directs light away from the metal contacts by total internal reflection. In some embodiments, the device includes extraction features such as cavities in the semiconductor structure which may extract glancing angle light directly, or direct the glancing angle light into smaller incidence angles which are more easily extracted from the device.
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Citations
15 Claims
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1. A device comprising:
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a semiconductor structure comprising a light emitting layer disposed between an n-type region and a p-type region, wherein light exits a top side of the semiconductor structure through the n-type region; a reflective metal contact disposed on a bottom side of the semiconductor structure and electrically connected to the p-type region; and an oxide disposed between the reflective metal contact and the p-type region, wherein light generated internal to the semiconductor structure at less than a certain angle is reflected off the oxide by total internal reflection toward the top side, and wherein light generated internal to the semiconductor structure passing through the oxide is reflected toward the top side by the reflective metal contact; wherein at least a portion of the top side of the semiconductor structure is textured. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification