A New Frontier in Lighting
Light-emitting diode, also known as LED, is a two-lead semiconductor light source. LEDs are commonly used as replacements for incandescent and neon indicator lamps, and in seven-segment displays. Physicists at the University of Toledo who were part of the international team of scientists discovered a single material that produces white light. A Professor of physics at UT said that it is efficient enough that it can potentially replace the use of LEDs.
Dr. Yanfa Yan, professor of Physics at UT, said that cesium, silver, indium, and chloride emit white light but the result of the efficiency is very low. However, if sodium is added, the efficiency increases dramatically. The negative side of adding sodium is that if its concentration reaches 40 percent the efficiency drops below about 86 percent.
The Energy Frontier Research Center of the Department of Energy conducted the calculations of the research made by the team led by Dr. Jiang Tang at Huazhong University of Science and Technology, as to why the material created emitted a high efficiency white light. Simulation helped them to visualize the mechanics on how the emission of the light is made. Dr. Sanjay Khare said that the work made by the team is very remarkable since it does not only emits stable and efficient warm-white light but it can also prove better replacement for their lead cousins.
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