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1, Led

Led is the abbreviation for Light Emitting Diode, meaning light-emitting diode, and its essence is an epoxy resin up to be a semiconductor chip, the P-type and N-type semiconductor composed of two parts. In the P-type semiconductor, the hole is the majority carrier; in the N-type semiconductor, electrons are majority carriers, one between the two semiconductor PN junction.

2, Led light-emitting principle

PN junction space charge region, there are N edge points from the P side of the self-built electric field. In other words, PN junction there is a certain barrier. When the PN junction forward bias voltage is applied, the barrier fell, P region and N region to the other side most of carrier diffusion. As the electron mobility is much greater than the hole mobility, resulting in a large number of electronic spread to the P area, constitute a small number of P zone carrier injection. The price band of electron hole recombination, the energy complex in the form of the release of light out, this is the Led light of the principle.

PN junction of the materials determines the wavelength of light, also determines the color of light. Because white is a polychromatic light, the white Led light-emitting principle little different. Some are issued first Blu-ray, Blu-ray excited by the color red, green and blue phosphors; some first issue of UV, UV excitation by the red, green and blue phosphors; plenty of the blue Led and yellow-green Led package together, constitute the white Led; plenty of the red, green and blue Led package together, constitute a white Led ... ... In short, the white light is not directly issued by a PN junction, but the compound into the.

3, Led lighting advantage

Led is a solid-state semiconductor devices, rugged than traditional lighting, long life, small size, environmentally friendly, easy dimming. 2008 Beijing Olympic Games opening ceremony is the largest ever Led light show, the nest slowly started fine picture, shining in the night sky ... ... the Olympic rings are the Led dimming technology.

Led tube source http://www.lampinled.com/