PHOTONIC STRUCTURES FOR EFFICIENT LIGHT EXTRACTION AND CONVERSION IN MULTI-COLOR LIGHT EMITTING DEVICES
First Claim
Patent Images
1. A high efficiency light emitting diode (LED) comprising:
- (a) a first active region including one or more primary emitting species (PES) for emitting light at a first wavelength, wherein the PES emit the light at the first wavelength when electrically-injected;
(b) a second active region including one or more secondary emitting species (SES) for emitting light at a second wavelength, wherein the SES emit the light at the second wavelength when optically-pumped by the light emitted by the PES at the first wavelength; and
(c) one or more photonic crystals, formed proximate to the first and second regions, wherein the photonic crystals are chosen to extract total internal reflection (TIR) or waveguided (WG) modes of the light emitted by the PES or the SES.
0 Assignments
0 Petitions
Accused Products
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.
-
Citations
23 Claims
-
1. A high efficiency light emitting diode (LED) comprising:
-
(a) a first active region including one or more primary emitting species (PES) for emitting light at a first wavelength, wherein the PES emit the light at the first wavelength when electrically-injected; (b) a second active region including one or more secondary emitting species (SES) for emitting light at a second wavelength, wherein the SES emit the light at the second wavelength when optically-pumped by the light emitted by the PES at the first wavelength; and (c) one or more photonic crystals, formed proximate to the first and second regions, wherein the photonic crystals are chosen to extract total internal reflection (TIR) or waveguided (WG) modes of the light emitted by the PES or the SES. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method of fabricating a high efficiency light emitting diode (LED), comprising:
-
(a) forming a first active region including one or more primary emitting species (PES) for emitting light at a first wavelength, wherein the PES emit the light at the first wavelength when electrically-injected; (b) forming a second active region including one or more secondary emitting species (SES) for emitting light at a second wavelength, wherein the SES emit the light at the second wavelength when optically-pumped by the light emitted by the PES at the first wavelength; and (c) forming one or more photonic crystals, proximate to the first and second regions, wherein the photonic crystals are chosen to extract total internal reflection (TIR) or waveguided (WG) modes of the light emitted by the PES or the SES. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
-
Specification