Search Results - diagnostic devices/treatments

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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 leads...
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
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 operation...
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