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LED technology is currently mainly used in automobile tail lights, traffic lights and displays for indoor lighting costs still too high, the equivalent of a 60-watt incandescent light illumination of the LED cost about 30 euros in Europe. The main reason is the production of LED lamps commonly used sapphire substrate and GaN epitaxial layer of expensive, light-emitting area is also restricted.
University of Kassel, said a press release recently, nano-structured semiconductor lighting the European research project, researchers are developing a new process using low-cost silicon-based panels to replace the sapphire substrate, and then the complex nanometer process to a diameter of about 100 nm, about 3000 Nm Hexagon Czochralski growth of a silicon plate. Compared with traditional techniques and new technology in the same space can have a greater, more compact light-emitting surface.
University of Kassel, the main contribution of this project is to use computer models to optimize the hexagonal structure of light-emitting boules, and that these can be issued semiconductor boules green, blue and red light. Through these types of mixed light, LED white light can be issued. Previous process in order to obtain a white light source, you need to LED fluorescent coated layer.
University of Kassel, Weiqiximan professor said, the new LED lights from basic research to mature technology products still need to overcome several obstacles. Researchers hope to launch before the end of 2012 the first demonstration samples. The Super LED lights is expected to officially put into operation at least another 5 years.
