Omnidirectional reflector
First Claim
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1. A device, comprising:
- a substrate;
a light-reflective layer disposed over the substrate;
a photonic crystal layer disposed over the substrate, the photonic crystal layer being configured to reflect light in a plane substantially parallel with the substrate while allowing light to travel unreflected in a direction substantially perpendicular to the substrate; and
a light-emitting diode (LED) disposed over the substrate, wherein the LED includes a light-emitting layer disposed between two doped layers having different types of conductivity, and wherein the light-reflective layer and the photonic crystal layer are disposed between the substrate and the LED.
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Abstract
A system and method for manufacturing an LED is provided. A preferred embodiment includes a substrate with a distributed Bragg reflector formed over the substrate. A photonic crystal layer is formed over the distributed Bragg reflector to collimate the light that impinges upon the distributed Bragg reflector, thereby increasing the efficiency of the distributed Bragg reflector. A first contact layer, an active layer, and a second contact layer are preferably either formed over the photonic crystal layer or alternatively attached to the photonic crystal layer.
14 Citations
20 Claims
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1. A device, comprising:
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a substrate; a light-reflective layer disposed over the substrate; a photonic crystal layer disposed over the substrate, the photonic crystal layer being configured to reflect light in a plane substantially parallel with the substrate while allowing light to travel unreflected in a direction substantially perpendicular to the substrate; and a light-emitting diode (LED) disposed over the substrate, wherein the LED includes a light-emitting layer disposed between two doped layers having different types of conductivity, and wherein the light-reflective layer and the photonic crystal layer are disposed between the substrate and the LED. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A device, comprising:
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a substrate; a light-reflective layer disposed over the substrate, wherein the light-reflective layer includes a stack of layers with alternatingly high and low refractive index values; a photonic crystal layer disposed over the substrate, the photonic crystal layer including a base layer and a plurality of columns embedded in the base layer, wherein the columns have a repeating lattice pattern, and wherein the columns have different refractive index values than the base layer, and wherein the photonic crystal layer is homogeneous with respect to a vertical direction perpendicular to the substrate and non-homogeneous with respect to a first horizontal direction and a second horizontal direction parallel with the substrate; and a light-emitting diode (LED) disposed over the substrate, wherein the LED includes a light-emitting layer disposed between two doped layers having different types of conductivity, and wherein the light-reflective layer and the photonic crystal layer are disposed between the substrate and the LED. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A device, comprising:
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a substrate; a Distributed Bragg Reflector (DBR) structure disposed over the substrate; a photonic crystal layer disposed over the substrate, the photonic crystal layer including a gallium nitride base layer and a lattice structure having a repeating pattern of columns disposed in the gallium nitride layer, wherein the columns contain air, silicon dioxide, titanium dioxide, or aluminum gallium nitride, and wherein the photonic crystal layer is homogeneous with respect to a first direction perpendicular to the substrate and non-homogeneous with respect to a second direction and a third direction that collectively define a plane parallel with an upper surface of the substrate; and a light-emitting diode (LED) disposed over the substrate, wherein the LED includes a light-emitting layer disposed between two doped layers having different types of conductivity, and wherein the DBR structure and the photonic crystal layer are disposed between the substrate and the LED. - View Dependent Claims (19, 20)
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Specification