Development of low cost and high brightness indoor LED lighting technology in Germany

LED technology is currently mainly used in the production of automobile tail lights, traffic lights and display for indoor lighting, the cost is too high, the main reason is the production of LED lamps commonly used sapphire substrate and epitaxial layer of gallium nitride light emitting area is expensive, limited. For this problem, Cassell University of Germany announced, with the structure of the computer model to optimize the six edge emitting crystal column, and the semiconductor crystal column can emit green, blue and red light. Through the combination of these lights, LED can emit white light. Process for obtaining a white light source on a LED surface coated with a fluorescent layer. In the same space can produce a larger, more compact light-emitting surface. The new process using the silicon substrate with low cost to replace the sapphire substrate, and then let the complex nanometer diameter six prism column about 100 nm and about 3000 nm high growth on silicon substrates. Researchers hope to launch the first demo sample by the end of 2012.