Efficient light extraction from weakly-coupled dielectric buttes
First Claim
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1. An optoelectronic device, comprising:
- a substrate;
at least one junction configured to provide an active region within the substrate;
a metallic back contact;
a collection of dielectric buttes disposed on a top surface of the substrate; and
wherein the collection of dielectric buttes are spaced greater than approximately one and less than approximately three (1/e) decay lengths of an evanescent field that corresponds to waveguiding within a butte, over an operating wavelength range for the junction.
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Abstract
A light emitting diode (LED) with weakly-coupled dielectric buttes deposited along the surface is disclosed. The buttes improve light extraction from a distributed volume of incoherent sources in a high-index substrate, as well as from light backscattered by a rear metallic contact. A lattice arrangement for the buttes maximizes area coverage, subject to the constraint of weak evanescent wave coupling between them. The butte distribution may be fabricated by epitaxial deposition above a current spreading layer, followed by photolithographic patterning and etching.
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18 Claims
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1. An optoelectronic device, comprising:
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a substrate; at least one junction configured to provide an active region within the substrate; a metallic back contact; a collection of dielectric buttes disposed on a top surface of the substrate; and wherein the collection of dielectric buttes are spaced greater than approximately one and less than approximately three (1/e) decay lengths of an evanescent field that corresponds to waveguiding within a butte, over an operating wavelength range for the junction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An optoelectronic device, comprising:
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a substrate; at least one junction configured to provide an active region within the substrate; a metallic back contact; a collection of dielectric buttes disposed on a top surface of the substrate; and wherein the collection of dielectric buttes provide greater than 25 percent area coverage of the top surface of the substrate; and wherein the collection of dielectric buttes are spaced to substantially maximize light extraction over an operating wavelength range for the junction. - View Dependent Claims (18)
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Specification