Search Results - light emitting diodes

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Multi-Color Quantum Well based LEDs
SUMMARY Lehigh University has developed a new method to achieve high performance and high efficiency Group III-Nitride LEDs and lasers. High efficiency emitters in the blue, green and red regime are important for SSL and medical applications. LEDs and lasers based on conventional technology suffer from poor performances, with one of the limitation...
Published: 8/17/2012   |   Inventor(s): Nelson Tansu, Ronald Arif, Yik-Khoon Ee, Hongping Zhao
Keywords(s): Biomedical Applications, DVD lasers, LED, Light Emitting Diodes
Category(s): Electronics
Improved Light Extraction for Solid State Lighting
SUMMARY Lehigh University has developed a new, low-cost method to achieve enhanced light extraction efficiency for III-Nitride LEDs. Conventional LEDs with planar emission surface suffers from limited external quantum efficiency. The large refractive index difference in the semiconductor / air interface results in total internal reflection. This le...
Published: 6/10/2011   |   Inventor(s): Nelson Tansu, James Gilchrist, Yik-Khoon Ee, Pisist Kumnorkaew, Ronald Arif
Keywords(s): Diagnostic Devices/Treatments, LED, Light Emitting Diodes, Optoelectronic Emitters
Category(s): Electronics
Enhanced Light Emitting Diodes
SUMMARY InGaN based quantum wells (QWs) light-emitting diodes and laser diodes play an important role in solids sate lighting (SSL). As the InGaN QWs are coupled to surface plasmon (SP) mode of metallic film, the radiative recombincation rate can be enhanced due to the increased photon density of states near the SP frequency. Lehigh University h...
Published: 6/10/2011   |   Inventor(s): Nelson Tansu, Hongping Zhao, Guangyu Liu
Keywords(s): Efficiency Enhancement, LED, Light Emitting Diodes
Category(s): Electronics
Method for Growing Epitaxail III-Nitrate Semiconductor Compounds on Substrates
SUMMARY While LED lighting sources have huge advantages over conventional sources, high fabrication and limited brightness have limited adoption of solid state lighting outside certain niche applications such as traffic lights. Lehigh University has developed a new method to help overcome these issues. This technology is an abbreviated growth mode ...
Published: 5/17/2010   |   Inventor(s): Nelson Tansu, Helen Chan, Richard Vinci, Yik-Khoon Ee, Jeffrey Biser
Keywords(s): LED, Light Emitting Diodes, Solid State Lighting, UV laser
Category(s): Electronics
Nitride-Based Type-II InGaN-(In)GaNAs 'W' Quantum Well Gain Media for Solid State Lighting Applications
SUMMARY Lehigh University has developed a new device concept and method to achieve high-performance and high efficiency Group III-Nitride LEDs and laser diodes emitting in the visible regime. LEDs and lasers based on conventional technology (InGaN quantum wells) suffer from poor performances due to low optical gain resulting in high current operati...
Published: 2/20/2009   |   Inventor(s): Nelson Tansu, Ronald Arif, Yik-Khoon Ee
Keywords(s): Diagnostic Devices/Treatments, Light Emitting Diodes, Tunable Lasers
Category(s): Electronics