文档介绍：LED Summary LED (Light Emitting Diode), light-emitting diode, isa solid state semiconductor devices, which can be directly converted into electricity to light. LED is the heart ofa semiconductor chip, the chip is attached toone end ofa stent, is the negative side, the other end of the power of the cathode, the entire chip package tobe epoxy resin. Semiconductor chip posed of two parts, part of the P-type semiconductor, it inside the hole-dominated, the other side is the N-type semiconductor, here is mainly electronic. But linking the two semiconductors, among them the formation ofa "PN junction." When the current through the wires role in this chip, will be pushing e-P, P zone in the hole with posite, and then tobe issued in the form of photon energy, and this is the principle of LED luminescence. The wavelength of light that is the color of light, is formed by the PN junction of the decisions of the material. Second LED history and development 50 years ago, people have to understand semiconductor materials can produce light of the basic knowledge, the mercial diodes in1960. English is the LED light emitting diode (LED) acronym, and its basic structure is an electroluminescent semiconductor materials, placed ina wire rack, then sealed with epoxy resin around, that is, solid package, Therefore, the protection of the internal batteries can play the role of line, so the seismic pe