CPN Research: A Revolution in Lighting


A Revolution in LightingLEDs are attracting interest as the surging demand for power worldwide matches the growing prosperity of developing nations. LEDs are ten times more efficient than incandescent bulbs, and in the near future, will serve as the primary light sources in homes across the globe. In working towards this reality, Nelson Tansu and his research team use the state-of-the-art facilities in Lehigh’s Center for Photonics and Nanoelectronics to design, grow, characterize, fabricate and test LED devices. Tansu’s group works mainly with indium gallium nitride (InGaN) LEDs that produce blue, green and white light. The researchers use metal organic chemical vapor deposition (MOCVD) instruments in the Smith Family Lab for Optical Technologies to form precise layers in InGa and N atoms whose growth rates and design structures are optimized to increase light generation at the desired frequency. Tansu’s team is working to improve optical efficiency with low-cost and practical methods of light extraction. They have developed arrays of microlenses to boost light extraction. Their method also enables greater control of the angular distribution of the light output.
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