In a month, feel really relaxed a lot, the suitable for women
Time:2013-03-21
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Shun Net News in English referred to as light-emitting diode LED, normally it by the gallium and arsenic, phosphorus compounds are made. After the power on which the electron and hole recombination when the visible light radiation. It found that of red phosphorus in gallium arsenide diodes, gallium phosphide diode hair green, silicon carbide diode yellow light. And small compared to incandescent bulbs and neon, LED's features include low voltage; operating current is small; impact and seismic performance, high reliability, long life; through the modulation current strength can be easily modulated luminescence strength. Based on these features, light-emitting diodes in many optoelectronic devices for light sources, electronic devices used in the signal display.
Cooling can improve the performance of light-emitting diodes
Vigorously promote energy conservation in today's LED lights, as more and more people of all ages, its market is growing. According to reports, the Shanghai World Expo in the region used 1.05 billion light-emitting diode bulbs, indoor lighting the Expo venue, about 80% of the use of LED as light source, compared to ordinary incandescent lamp power up to 90%. Experts say China's 2010 output of LED sales will exceed 150 billion yuan, equivalent to twice the 2008.
U.S. companies will use the graphite foam to improve LED performance cooling.
LEDs bright future.
The face of a broad market demand, people strive to improve the performance of LED lighting. Found that, although the light-emitting diode voltage and current is very low, but it still exists heat problem. LED temperature decreasing by 10 degrees Fahrenheit, the LED will double the life span of components, thus improving the cooling performance of LED lighting is very important.
The new cooling materials of graphite foam debut
U.S. Department of Energy's Oak Ridge National Laboratory (ORNL) Department of Materials Science and Technology researchers 詹姆斯克勒 invented a special technology called graphite foam. Using this technology, people can get graphite foam (graphite foam) material. With graphite foam helps cool LED lights, can more effectively control their heat, thus extending its life and reduce the price. This is expected to expand the light-emitting diode lighting of users.
Cloeter said: "(graphite foam) technology to reduce light-emitting diode lighting systems, stability, and prolong its life at the same time, the technology could replace general lighting equipment replacement and maintenance costs, annual savings for the city millions of dollars." He hoped that the graphite foam technology can save money for customers.
With the traditional use of metals such as copper and aluminum heat materials, the new technology made of graphite foam has many advantages, such as high thermal conductivity graphite foam, lightweight and easily processed. These features make the graphite foam has a better design flexibility, a lighter, cheaper and more efficient LED lighting cooling material.
It is learned that the special graphite foam with the formation of graphite crystal structure is the key to its good thermal conductivity. Crystal structure of the "skeleton" full of air holes, as compared with graphite, graphite foam density of only 25% of graphite, so the lighter. Graphite foam unique bond network to quickly distribute the heat off the heat, so it is an ideal cooling material.
As the devaluation of the energy-efficient lighting products, LED lighting because of their low energy consumption, compact and features a long life expectancy has been increasing use of street lighting and car parks in the areas of lighting application demands are also constantly increase.
LED North America, specializes in urban, commercial and industrial applications in the field of LED lighting products. To continuously improve the performance of LED lighting lamps to ensure their long-term competition with rivals in a good position, before the Company and Oak Ridge National Laboratory signed a technical cooperation agreement with graphite foam, obtained the right to use the technology. Company plans to use the technology to produce graphite foam, foam with graphite to assist passive cooling heat LED lighting components.
LED North American companies set up in the Oak Ridge National Laboratory, called "Technology 2020" in the experimental incubator, companies and laboratories to establish a good relationship. Andrew Williams said the company founder, and Oak Ridge National Laboratory is adjacent to the company and laboratory researchers to more easily work closely together to improve the graphite foam material and LED lights.
