Photonic structures for efficient light extraction and conversion in multi-color light emitting devices
First Claim
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1. A high efficiency light emitting diode (LED) comprising:
- (a) a first region for emitting light at a first wavelength when electrically-injected;
(b) one or more second regions for emitting light at a second wavelength when optically-pumped by the light emitted by the first region at the first wavelength; and
(c) one or more photonic crystals for extracting total internal reflection (TIR) or waveguided (WG) modes of the light emitted by both the first and second regions.
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Abstract
A high efficiency light emitting diode (LED) comprised of a substrate, a buffer layer grown on the substrate (if such a layer is needed), a first active region comprising primary emitting species (PES) that are electrically-injected, a second active region comprising secondary emitting species (SES) that are optically-pumped by the light emitted from the PES, and photonic crystals, wherein the photonic crystals act as diffraction gratings to provide high light extraction efficiency, to provide efficient excitation of the SES, and/or to modulate the far-field emission pattern.
29 Citations
23 Claims
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1. A high efficiency light emitting diode (LED) comprising:
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(a) a first region for emitting light at a first wavelength when electrically-injected; (b) one or more second regions for emitting light at a second wavelength when optically-pumped by the light emitted by the first region at the first wavelength; and (c) one or more photonic crystals for extracting total internal reflection (TIR) or waveguided (WG) modes of the light emitted by both the first and second regions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of fabricating a high efficiency light emitting diode (LED), comprising:
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(a) forming a first region for emitting light at a first wavelength when electrically-injected; (b) forming one or more second regions for emitting light at a second wavelength when optically-pumped by the light emitted by the first region at the first wavelength; and (c) forming one or more photonic crystals, to extract total internal reflection (TIR) or waveguided (WG) modes of the light emitted by both the first region or the second regions. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification