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| Author: | apple527 [ Tue Dec 12, 2017 3:37 am ] |
| Post subject: | Jerseys Free Shipping |
A light-emitting diode (LED) is a semiconductor light source. LEDs are used as indicator lamps in many devices and are increasingly used for general lighting. Appearing as practical electronic components in 1962 Cheap Nike NFL Jerseys , early LEDs emitted low-intensity red light, but modern versions are available across the visible, ultraviolet, and infrared wavelengths, with very high brightness. When a light-emitting diode is switched on, electrons are able to recombine with holes within the device, releasing energy in the form of photons. This effect is called electroluminescence, and the color of the light (corresponding to the energy of the photon) is determined by the energy band gap of the semiconductor. An LED is often small in area (less than 1 mm2), and integrated optical components may be used to shape its radiation pattern. LEDs have many advantages over incandescent light sources including lower energy consumption, longer lifetime, improved physical robustness, smaller size, and faster switching. However, LEDs powerful enough for room lighting are relatively expensive, and require more precise current and heat management than compact fluorescent lamp sources of comparable output. LED wafer substrate Current substrate for GaN based LED materials more, but can be used for commercialization of substrate only two Cheap New NFL Jerseys , namely, Sapphire and silicon carbide substrates. Others such as GaN, Si, ZnO substrates in the research and development stage, there is still some distance away from industrialization. |
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