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Light emitting diode Led is the abbreviation of the English, namely: light excitation diode is a semiconductor component. 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 certain semiconductor materials, PN junction, the injection of minority carrier and majority carrier recombination, when will the excess energy released in the form of light to convert light energy directly into electrical energy. PN junction reverse voltage, minority-carrier injection is difficult, it is not light. The use of injection electroluminescent diodes calLed the principle of making light emitting diodes, commonly known as Led. led tube



When it is in working condition when a positive (that ends with a positive voltage), current from the Led anode to the cathode, the semiconductor crystals to the making of different colors from the ultraviolet to infrared light, light intensity and current. Analogy, Led is like a hamburger, you can light the material is laminated in "meat pie", while the bottom electrode is the bread with meat. Luminescent material through the research on which people gradually developed a variety of light and color, higher and higher optical efficiency Led components, but no matter how changes in, Led light-emitting principle and structure of the total did not change much.
Seen as a latest lighting technology, Led light the advantages not only in terms of quality in its production, manufacture, ease of use should be far beyond the incandescent, fluorescent and other traditional sources, it has been since the birth of 60 years, has been considerable development and application. And compared to incandescent, fluorescent and other old generation of light-emitting device, Led's advantages in the following areas:
1, Led glass case in the structure does not, do not want to incandescent or fluorescent lamps as in the vacuum or into the
Specific gases, seismic, impact resistance, well, to the production, transportation, use all aspects of convenience.
2, Led components can be made very small size, more user-friendly layout and design Gezhong equipment.
3, Led light the issue of energy concentration is high, concentrated in a smaller window of wavelengths, high purity.
4, Led components very long life, generally 5 million -10 million hours in between, even the frequent switching, it will not affect
To life.
5, Led response time is very fast in the microsecond level.
6, Led light-emitting point is very strong, light attenuation is much lower than traditional light sources.
7, Led in the production process do not add the "Mercury", is very environmentally friendly.
8, Led can be driven with low-voltage direct current, the lower the use of environmental requirements.
It is because, compared with traditional light sources have the first three generations of advantages, Led light source as a solid-state semiconductor lighting source, has been recognized as the world's fourth-generation light source, of which, the white Led will become the 21st century, the most promising semiconductor green lighting light source, has been the strong support of governments and promotion.