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What is LED
RELEASE TIME:2011-11-18 19:35:18

 What is LED? 


    LED is the English Light Emitting Diode (LED) acronym, is a solid light-emitting semiconductor devices. Use of solid semiconductor chip as luminescent materials in the semiconductor compound occurs through the carrier release excess energy and cause photon emission directly emit red, orange, yellow, green, green, blue, purple and white light. LED products that use LED as a light source created by the high-tech products. Please indicate comes from LEDSOPTIC.

Two common profile LED light source 
    The core part of the light-emitting diode is a P-type semiconductor and N type semiconductor chip formed in the P-type semiconductor and N-type semiconductor between a transition layer, called the PN junction. In some semiconductor materials, PN junction, the injection of minority carrier and majority carrier recombination, when will the excess energy released in the form of light, which convert light energy directly into electrical energy. PN junction reverse voltage, minority carrier injection is difficult, it is not light. This use of injection electroluminescent diodes called the principle of making light emitting diodes, referred to as LED. When it is in working state (ie, ends with a positive voltage), current from the LED anode to the cathode, the semiconductor crystals from the ultraviolet to infrared light of different colors, light intensity and current. Please indicate comes from LEDSOPTIC. 

    LED is called fourth generation light source or green light, energy saving, environmental protection, long life, small size and other characteristics, can be widely applied in various directions, display, decoration, backlight, general lighting and urban landscape areas. In recent years, countries around the world, research and application of LED technology in a fierce competition. Since 2000, U.S. $ 500 million investment to implement the "National Semiconductor Lighting Plan", July 2000, the EU has also announced the launch of similar programs. China's "863" program support, in June 2003 for the first time proposed the development of semiconductor lighting program. Please indicate comes from LEDSOPTIC.


 

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