External extraction light emitting diode based upon crystallographic faceted surfaces
First Claim
1. A light emitting diode comprising:
- a Group III nitride light emitting active structure mesa;
said mesa having its sidewalls along an indexed crystal plane of the Group III nitride.
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Abstract
A light emitting diode is disclosed that includes a support structure and a Group III nitride light emitting active structure mesa on the support structure. The mesa has its sidewalls along an indexed crystal plane of the Group III nitride. A method of forming the diode is also disclosed that includes the steps of removing a substrate from a Group III nitride light emitting structure that includes a sub-mount structure on the Group III nitride light emitting structure opposite the substrate, and thereafter etching the surface of the Group III nitride from which the substrate has been removed with an anisotropic etch to develop crystal facets on the surface in which the facets are along an index plane of the Group III nitride. The method can also include etching the light emitting structure with an anisotropic etch to form a mesa with edges along an index plane of the Group III nitride.
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Citations
58 Claims
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1. A light emitting diode comprising:
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a Group III nitride light emitting active structure mesa;
said mesa having its sidewalls along an indexed crystal plane of the Group III nitride. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of forming a light emitting diode with improved light extraction, the method comprising:
anisotropicly etching the surface of a Group III nitride layer to develop crystal facets on the Group III nitride surface in which the facets are along an index plane of the Group III nitride. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A light emitting diode with enhanced light extraction characteristics, comprising:
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a sub-mounting structure;
at least one n-type and one p-type layer of Group III nitride on said sub-mounting structure and forming p-n junction for recombination of carriers and emission of photons under an applied voltage;
said group three nitride layers forming a mesa above said sub-mount structure in which the side walls of said mesa are defined by an indexed plane of said Group III nitride;
said diode terminating in one of said Group III nitride layers, with said terminal Group III nitride layer forming the light emitting surface of said diode;
said light emitting surface being formed of a plurality of crystal structures that demonstrate indexed planes of the Group III nitride;
an ohmic contact to said light emitting surface; and
an ohmic contact to said sub-mount structure. - View Dependent Claims (32, 33, 34, 35, 36, 45)
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- 37. A light emitting diode comprising a Group III nitride light emitting active structure mesa having chemically developed sidewalls.
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51. A light emitting diode comprising:
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a Group III nitride light emitting active structure mesa;
an emitting surface on said mesa formed of a plurality of crystallographic features and said mesa having sidewalls geometrically congruent with said crystallographic features on said emitting surface. - View Dependent Claims (52, 53, 54, 55, 56, 57, 58)
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Specification