LED lighting LED lighting principle is Ⅲ-Ⅳ compounds, such as GaAs (gallium arsenide), GaP (Gallium Phosphide), GaAsP (gallium arsenide phosphorus) and other semiconductor made of, its core is a PN junction. IN feature LED lighting price so that it has a general PN junction that is forward, reverse blocking, breakdown characteristics. In addition, under certain conditions, it also has luminescent properties. In the forward voltage LED lighting Guinness, electrons from N zone injection P area, hole injection from the P District N District. Into other areas of minority carriers (minority) part of the majority carriers (many children) composite and light. Assume emitting occurred in the P region, the injected electrons and valence band holes direct composite and light, or light-emitting center was first captured, then with the hole recombination. In addition to this light-emitting compound, some electrons are (between the center of the conduction band, dielectric belt near the middle) non-luminescent center to capture, and then with the hole recombination, each time the energy released is not, can not form visible. Emitting composite volume relative to non-emitting composite volume ratio, the higher quantum efficiency. Since the compound is in the minority carrier diffusion area glowing, so light produces only near PN junction within several μm. Theory and Practice shows that the peak wavelength λ of the light band gap semiconductor material emitting region Eg about that λ≈1240 / Eg (mm) where Eg units of electron volts (eV). If you can produce visible light (wavelength of 380nm violet ~ 780nm red), Eg of semiconductor materials should be between 3.26 ~ 1.63eV. Longer wavelength than the red light to infrared light. Now there are infrared, red, yellow, green and blue light-emitting diodes, but blue-light LED cost, the price is high, use not common. 1 illumination characteristics. Limit the significance of parameters (1) to allow power Pm: allows you to add to the positive DC voltage across the LED with a maximum current flowing through it the product of. More than this value, LED fever, damage. (2) The maximum forward current IFm: allows you to add the maximum forward current. Exceeding this value can damage the diodes. (3) The maximum reverse voltage VRm: the allowed maximum reverse voltage applied. More than this value, the light emitting diode may be breakdown. (4) Working environment topm: light-emitting diodes with a working temperature range. Lower or higher than this temperature range, the LED will not work, efficiency is greatly reduced. Without changing the premise of the material in the LED limits, higher brightness means it is to increase the current LED lighting, as the current increases, LED heat will soar. Used LED light source portable projector, or micro-investment of friends, we all understand LED lighting manufacturers, LED light source projector, very hot, and generally there will be significant noise. These products, small body is one thing, the key is large due to its own heat. With the increase in power, LED heat dissipation becomes more and more prominent, a large number of practical applications show, LED input power can not increase the basic reason is due to the LED during operation will release a lot of heat, so that the die junction temperature quickly rises, the thermal resistance becomes large. Input power, the greater the heating effect. At elevated temperatures will lead to changes in device performance and attenuation, non-radiative recombination increases, the leakage current of the device increases, the growth of the semiconductor material defects, the metal electrode migration, yellowing epoxy encapsulation, etc., seriously affecting the LED photoelectric parameters. And even the power LED failure. Thus, for LED devices, reduce the thermal resistance and junction temperature, thermal properties of light emitting diodes research seems increasingly important. Changyuan LED lighting _ _ Xi Xi Connaught Connaught Electrical and Mechanical LED lighting provided by conventional Connaught Mechanical and Electrical Equipment Co., Ltd., Henan. Changyuan LED lighting _ _ Xi Xi Connaught Electrical and Mechanical Connaught Connaught conventional LED lighting Henan Mechanical and Electrical Equipment Co., Ltd. (www.hnxinuo.com) this year introduced a new upgrade, the above picture is for reference only, please call or pictures on this page contact telephone number, to obtain the latest information, contact: Yang Yongjie.