Light-emitting diode with planar omni-directional reflector
AssigneeRensselaer Polytechnic Institute
InventorE. Fred Schubert
Life of this patent
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Abstract
A high extraction efficiency, light-emitting diode having a reflective submount and methods for forming the LED. A light-emitting region is disposed between a top contact and a conductive holder. The region extends beyond an area underlying the top contact. An omni-directional reflector is disposed between the light-emitting region and the conductive holder. According to one embodiment, the reflector comprises one or more electrically conductive contacts configured to correspond to an area beyond the area underlying the top contact. According to one embodiment, the reflector comprises a dielectric layer having a refractive index of between about 1.10 and 2.25, contacts extending through the reflector, and a reflective conductive film.
Claims29
A light-emitting diode comprising:
- a top contact defining an area underlying the top contact;
- a conductive holder;
- a light-emitting region disposed between the top contact and the conductive holder and extending beyond the area underlying the top contact;
- and
- an omni-directional reflector disposed between the light-emitting region and the conductive holder, the omni-directional reflector having one or more electrically conductive contacts configured to correspond to a region beyond the area underlying the top contact.
A light-emitting diode comprising:
- an active region having two opposite-conductivity-type confinement layers with a light-emitting region disposed between the layers;
- and
- an omni-directional reflector proximate a first one of the confinement layers opposite the light-emitting region.
A method for forming a light-emitting diode comprising the steps of:
- forming epitaxial layers on a substrate, the epitaxial layers comprising a light-emitting region;
- forming a top contact over the epitaxial layers;
- attaching a temporary holder to the top contact and the epitaxial layers;
- removing the substrate;
- forming an omni-directional reflector on the epitaxial layers;
- attaching a conductive holder to the omni-directional reflector;
- and
- removing the temporary holder.
A method for forming a light-emitting diode comprising the steps of:
- forming epitaxial layers on a substrate, the epitaxial layers comprising a light-emitting region;
- forming an omni-directional reflector on the epitaxial layers;
- attaching a conductive holder to the omni-directional reflector;
- removing the substrate;
- and
- forming a top contact on the epitaxial layers opposite the conductive holder.
Dependencies are inferred from the claim text.