Photonic Structures for Efficient Light Extraction and Conversion in Multi-Color LEDs

Increased brightness Increased light extraction and conversion efficiencies

Multi-color LEDs  This technology is available for a non-exclusive license. See below for a selection of the patents and patent applications related to this invention. Please inquire for full patent portfolio status.

Researchers at the University of California, Santa Barbara have developed multiple-light source LEDs that provide increased light extraction and conversion efficiencies, as well as increased brightness, while retaining planar structures. The LEDs contain several emitting species, each providing light emission in a range of wavelengths. Photonic crystals, acting as diffraction gratings, ensure efficient light extraction, efficient excitation of the optically-pumped species, and provide a means for modifying the far-field emission pattern for optimal shape.

Patent Number: US7768023B2
Application Number: US2005251365A
Inventor: Diana, Frédéric S. | David, Aurélien J. F. | Petroff, Pierre M. | Weisbuch, Claude C. A.
Priority Date: 14 Oct 2005
Priority Number: US7768023B2
Application Date: 14 Oct 2005
Publication Date: 3 Aug 2010
IPC Current: H01L003300 | H01L003320 | H01L003350
US Class: 257098 | 257099 | 257E33061 | 257E33067 | 257E33069 | 438027 | 438029 | 438031 | 438032
Assignee Applicant: The Regents of the University of California
Title: Photonic structures for efficient light extraction and conversion in multi-color light emitting devices
Usefulness: Photonic structures for efficient light extraction and conversion in multi-color light emitting devices
Summary: For use as LED.
Novelty: High-efficiency LED includes first active region comprising electrically injected primary emitting species, second active region comprising optically pumped secondary emitting species, and photonic crystals extracting waveguided modes

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发光二极管/有机发光二极管

7768023

Background

The green-yellow portion of the visible spectrum is still lacking efficiency, while the combination of different colors on a single substrate is very limited with state-of-the-art semiconductors grown by conventional methods. Alternative materials should be used, and phosphors can offer good solutions. There is a need in the art for improving the far-field patterns of the different components of emission that make the color rendering angle-dependent without significantly increasing the size of the device.

Additional Technologies by these Inventors

• Improved Manufacturing of Semiconductor Lasers
• Improved Manufacturing of Solid State Lasers via Patterning of Photonic Crystals
• Single or Multi-Color High Efficiency LED by Growth Over a Patterned Substrate
• High Efficiency LED with Optimized Photonic Crystal Extractor
• Method for Manufacturing Improved III-Nitride LEDs and Laser Diodes: Monolithic Integration of Optically Pumped and Electrically Injected III-Nitride LEDs
• Infrared Detector Utilized in Ultrahigh Resolution Imaging
• Method for Growing Self-Assembled Quantum Dot Lattices

Tech ID/UC Case

21913/2005-534-0

Related Cases

2005-534-0

美国

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