Light emitting diode structures
First Claim
1. A light emitting diode (LED) structure including an active core layer and at least one substrate layer having a first refractive index, comprising a 2-dimensional photonic quasicrystal in the substrate layer, the photonic quasicrystal comprising an array of regions having a second refractive index, the array exhibiting long range order but short range disorder.
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Abstract
According to one aspect of the present invention, a light emitting diode (LED) structure including an active core layer and at least one substrate layer having a first refractive index, comprises a 2-dimensional photonic quasicrystal in the structure, the photonic quasicrystal comprising an array of regions having a second refractive index, the array exhibiting long range order but short range disorder. The long range order is associated with diffractive properties of the structure and gives rise to uniform-far field diffraction patterns from the LED. The present invention enjoys the benefit of improved light extraction from LEDs without undesirable far field illumination patterns.
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Citations
17 Claims
- 1. A light emitting diode (LED) structure including an active core layer and at least one substrate layer having a first refractive index, comprising a 2-dimensional photonic quasicrystal in the substrate layer, the photonic quasicrystal comprising an array of regions having a second refractive index, the array exhibiting long range order but short range disorder.
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14. A light emitting diode (LED) structure including an active core layer and a least one substrate layer having a first refractive index, comprising a 2-dimensional photonic band structure in the substrate layer, the photonic band structure comprising an array of regions having a second refractive index, wherein each region has a predetermined constant spacing from at least one other region and each region is spaced from all other regions by a predetermined minimum distance but wherein the array of regions is amorphous.
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15. A method of extracting light from an LED structure comprising the step of providing a photonic quasicrystal in a layer of the LED structure other than in an active core layer, the photonic quasicrystal exhibiting long range order but short range disorder.
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16. A method of manufacturing an LED structure comprising the steps of:
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providing at least one substrate layer;
providing an active core layer; and
forming a photonic quasicrystal in the substrate layer, the photonic quasicrystal exhibiting long range order but short range disorder.
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17. A method of manufacturing an LED structure comprises the steps of:
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providing at least one substrate layer having a first refractive index;
providing an active core layer; and
forming a photonic band structure in the substrate layer, the photonic band structure comprising an array of regions having a second refractive index, wherein each region has a predetermined constant spacing from at least one other region and each region is spaced from all other regions by a predetermined minimum distance but wherein the array of regions is amorphous.
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Specification