First, LED history 50 years ago, people already knew the basics of light generated by semiconductor materials. In 1962, General Electric's Nick Holonyak Jr. developed the first practical application of visible light-emitting diodes. LED is the abbreviation of English light emitting diode. Its basic structure is an electroluminescent semiconductor material placed on a leaded shelf and then sealed with epoxy resin, that is, solid package, so it can To protect the internal core wire, the LED has good seismic performance. Originally used as an indicator light source for instrumentation, LEDs of various light colors have been widely used in traffic lights and large-area displays, resulting in good economic and social benefits. Taking a 12-inch red traffic light as an example, in the United States, a long-life, low-efficiency 140-watt incandescent lamp was used as a light source, which produced 2000 lumens of white light. After passing the red filter, the light loss is 90%, leaving only 200 lumens of red light. In the newly designed lamp, Lumileds used 18 red LED light sources, including circuit losses, to consume 14 watts of electricity, which can produce the same light effect. Automotive signal lights are also an important area for LED light source applications. Second, the principle of LED chips LED (Light Emitting Diode), a solid-state semiconductor device that converts electricity directly into light. The heart of the LED is a semiconductor wafer. One end of the wafer is attached to a holder, one end is the negative pole, and the other end is connected to the positive pole of the power supply, so that the entire wafer is encapsulated by epoxy resin. The semiconductor wafer consists of two parts, one part is a P-type semiconductor, in which the hole dominates, and the other end is an N-type semiconductor, which is mainly electrons here. But when the two semiconductors are connected, they form a "PN junction" between them. When a current is applied to the wafer through the wire, the electrons are pushed toward the P region. In the P region, electrons recombine with the holes, and then the energy is emitted in the form of photons. This is the principle of LED illumination. The wavelength of light, which is the color of light, is determined by the material that forms the PN junction. Third, the main chip manufacturers Osram of Germany, lumens of the United States, CREE, AXT, Taiwan's Guangjia, Guolian (FPD), Dingyuan (TK), Huaying (AOC), Hanguang (HL), Addison, Guanglei (ED), There are Seoul in Japan, Japan, Toshiba in Japan, Dalian Lumei, Fudi, Sanan, Hangzhou Silan Mingxin, and Imitation Japan. They are well-known chip suppliers. under. Taiwan LED chip maker: Epistar (Epistar) referred to as: ES, (Lianquan, Yuankun, Lianyong, Guolian), Guangga Optoelectronics (Huga), New Century (Genesis Photonics), Arima Optoelectronics: AOC, Tekcore, Kellett, Fuxin, Guanghong, Jingfa, Shichuang, Zhoulei, Liansheng (HPO), Hanguang (HL), Guanglei (ED), Dingyuan (Tyntek) : TK, 曜富洲科技TC, Canosa (FormosaEpitaxy), Guotong, Lianding, New Optoelectronics (VPEC). Ledtech Electronics, UnityOptoTechnology, ParaLight Electronics, Everlight Electronics, Bright LED Electronics, King Bright, Lingsen Precision Industries, Ligitek Electronics, Lite-On Technology, HARVATEK, etc. Continental LED chip manufacturers: Sanan Optoelectronics abbreviation (S), Shanghai Blu-ray (Epilight) abbreviation (E), Silan Mingxin (SL), Dalian Lumei (LM), Diyuan Optoelectronics, Huacan Optoelectronics , Nanchang Xinlei Shanghai Jinqiao Dachen, Hebei Lide, Hebei Huineng, Shenzhen Orende, Shenzhen Century Jingyuan, Guangzhou Puguang, Yangzhou Huaxia Integration, Gansu Xintiandian Company, Dongguan Fudi Electronic Materials, Qingxin Optoelectronics, Jingneng Optoelectronics , Medium-light optoelectronics , dry-light photoelectric , Jingda Optoelectronics, Shenzhen Fangda, Shandong Huaguang, Shanghai Lanbao and so on. Langrui Energy (Shenzhen) Co.,Ltd , https://www.langruienergy.com