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Long history and application of Led
It has been about 50 years ago, the semiconductor material can have a basic knowLedge of light in 1962, General Electric Company, Nick? Ho Lun Yake (NickHolonyakJr.) developed the first practical application of visible light emitting diodes. Led is the English light emitting diode (Led) acronym, and its basic structure is an electroluminescent semiconductor materials, placed on a wire rack, and then seaLed with epoxy resin around, that is solid package, it can play to protect the internal core wire effect, so Led's seismic performance.
The core part of the light-emitting diode is a P-type semiconductor and N type semiconductor wafer formed in the P-type semiconductors and N-type semiconductor there is a transition layer between, calLed the PN junction. In some semiconductor materials, PN junction, the injection of minority carrier and majority carrier recombination extra time to time to the form of light energy released, which convert light energy directly into electrical energy. PN junction reverse voltage is applied, the minority carrier injection is difficult, it is not light. This use of principle of injection electroluminescence diodes calLed Leds produced, known as Led. When it is in working condition when the positive (that ends with a positive voltage), current flows from the Led anode cathode, the semiconductor crystal on the issue of different colors from the ultraviolet to infrared light, light intensity and current.
Led instrument for the first Led light source direction, then all kinds of light-colored Led in traffic lights and large screens in the widely used and produced good economic and social benefits. A 12-inch red traffic lights, for example, is used in the United States had a long life, low efficiency of 140 watt incandescent light as the light source, it produces 2000 lumens of white light. The red filter, the optical loss of 90%, only 200 lumens of red light. In light of the new design, LumiLeds has used a red Led light source 18, including circuit losses, including a total power of 14 watts, the light can produce the same effect. Automotive Led lights are also important areas of light application.
For general lighting, the white light that people need. 1998 white light Led developed. This is the GaN Led chip and yttrium aluminum garnet (YAG) made package together. GaN chip of blue (λp = 465nm, Wd = 30nm), made of high-temperature sintering of YAG phosphor containing Ce3 + excited by this blue light yellow light after the shooting, the peak 550nm. Blue Led substrate instalLed in the reflective cavity bowl, cover with thin layer of resin mixed with YAG, about 200-500nm. Issued blue Led substrate partially phosphor absorbed, and some blue mixed with yellow phosphor issued, can be too white. Now, for the InGaN / YAG white Led, YAG phosphor by changing the chemical composition and adjust the thickness of the phosphor layer, available colors and color temperature 3500-10000K white. This blue Led through the method by white light, simple structure, low cost, high technology is mature, so use the most.
White Led
60s of last century, scientists used the principle of light-emitting semiconductor PN junction, the development became light-emitting diode Led. Was developed Led, the materials used are GaASP, its light color is red. After nearly 30 years of development, it is now very familiar with the Led, has been able to send red, orange, yellow, green, blue and other color light. However, white light Led lighting for use by only developed only in recent years, here to introduce the reader to use white Led lighting

With Led technology, its high brightness, super energy-saving, strong visual impact and so are people like that in lighting,

Led module screen, truss-sensing dance screen, high brightness light box so widely used.
In early September at the Five Central Asian Countries Economic and Trade Fair Urumqi Fair finally successful, in the Urumqi Fair site has tens of thousands of exhibitors

Chinese enterprises, and the most notable of this year's show Led products have been sought after by the majority of consumers, Xinjiang TV, NU

Mu Qi stations have reported good participation in the Beijing State Bright Led products, and the past is that the exhibition of Led products and we

Lives, a number of small products, Led products have entered people's lives, many foreign tourists and non-Chinese exhibitors

Always curious, hope and the company co-operation and development of Led products for market.