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US 7,804,100 B2Granted
Polarization-reversed III-nitride light emitting device
AssigneesPhilips Lumileds Lighting Company, LLC, Koninklijke Philips Electronics N.V.
InventorsJonathan J. Wierer, Jr., M. George Craford, John E. Epler, Michael R. Krames
Life of this patent
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Abstract
A device structure includes a III-nitride wurtzite semiconductor light emitting region disposed between a p-type region and an n-type region. A bonded interface is disposed between two surfaces, one of the surfaces being a surface of the device structure. The bonded interface facilitates an orientation of the wurtzite c-axis in the light emitting region that confines carriers in the light emitting region, potentially increasing efficiency at high current density.
Claims16
A structure comprising:
- a device structure comprising a III-nitride light emitting region disposed between a p-type region and an n-type region, the light emitting region comprising a wurtzite crystal structure;
- and
- a non-III-nitride material disposed between two surfaces, wherein:
- one of the surfaces is a surface of a wurtzite crystal portion of the device structure, the wurtzite crystal portion of the device structure comprising alternating layers of group III atoms and group V atoms, wherein the surface of the wurtzite crystal portion of the device structure comprises a surface of a layer of group III atoms;
- and
- the other of the surfaces is a surface of a wurtzite crystal portion of a second structure, the wurtzite crystal portion of the second structure comprising alternating layers of group III atoms and group V atoms, wherein the surface of the wurtzite crystal portion of the second structure comprises a surface of a layer of group III atoms;
- and
- the non-III-nitride material is in direct contact with the two surfaces;
- wherein across an interface disposed between the light emitting region and the p-type region, a wurtzite c-axis, defined as pointing from a nitrogen face of a III-nitride unit cell to a group III atom face of the III-nitride unit cell, points toward the light emitting region.
6 more elements
Dependencies are inferred from the claim text.