LED (full name: Light-Emitting Diode, light-emitting diode) is a semiconductor electronic components capable of emitting light. With the constant advances in technology, LED has been widely used in monitors, televisions and LED Street Light lighting decorative lighting and other fields. Driven by market demand and technical progress, LED has gone through a glorious history. 1907, Henry Joseph Round as an abrasive silicon carbide crystals found after (SiC) power can be luminous phenomenon. After this phenomenon was discovered, people have studied the phenomenon of luminescence of minerals and Ⅱ-Ⅳ SiC compound semiconductor start. 1936, George Destiau published a report on the future of ZnS powder glowing. With further research, culminating in a "electroluminescence" This terminology. 1952, synthetic Ge, pn Si crystal knot emitting born. 1954, began production, research GaP and GaAs single crystal single crystal performance. 1962, GE, Monsanto, IBM's joint laboratory developed a hair red phosphorus gallium arsenide (GaAsP) semiconductor compounds, from visible light-emitting diode entered the commercial development process. 1965, the world‘s first commercial light-emitting diode born, it is made ??with germanium materials can emit infrared light, LED, then priced at approximately $ 45. Shortly thereafter, Monsanto and Hewlett-Packard introduced the use GaAsp materials commercialization red LED. This LED efficiency is about 0.1 lm / w, 60-100w than normal incandescent lamp 15lm / w to 100 times lower. 1968, LED research and development has made a breakthrough technology to make efficient use of nitrogen-doped GaAsP device reached 1 lm / w, and can emit red, orange and yellow. 1971, the industry has launched a GaP green LED chips with the same efficiency. 1993, Shuji Nakamura of Nichia Chemical success in Japan (Nichia) work to put nitrogen into the invention of wide bandgap semiconductor materials based on gallium nitride (GaN) and indium gallium nitride (InGaN) blue LED has a commercial value of such LED in the late 1990s, has been widely used. 1997, Schlotter and Nakamura, who has invented a die with a blue plus yellow phosphor white LED technology packaged into. Following the gallium nitride LED, and then the scientific community can be manufactured to generate high intensity green and blue gallium indium nitrogen LED. Ultra-bright white LED blue chip is the core cast in this light-emitting phosphor chip, then the phosphor by absorbing blue light from the chip and then converted to white light. Using this technique can produce any color of the visible light. September 2003, CREE, Inc. demonstrated its new blue LED, under 20mW efficiency of 35%. They also created an up to 65 lm / W (lumens per watt) white LED products, which is the prevailing market brightest white LED. In 2005 they demonstrated a prototype white LED at 350mW, hit a record of efficiency of 70 lm per watt. 年 2006, Cree announced the launch of a new cool white LED - "XP.G", the luminous efficiency and brightness have set a new record, the drive current of 350mA, the luminous flux of up to 139lm, the luminous efficiency of 132 lm / W, brightness and light effects were most brighter than Cree‘s XR-E LED increase 37% and 53%, known as "the industry‘s brightest and highest efficiency lighting level LED". February 2009, Nichia Chemical (Nichia) published the efficiency up to 249 lm / W of LED, which was the laboratory data. February 2013, LED Lighting market leader Cree announced that its white power LED light effect again to refresh the record industry‘s highest, reaching 276 lm / W. LED development history has been for decades, as people semiconductor research deepening of luminescent materials, LED manufacturing technology continues to progress and development and application of new materials, high brightness LED various colors breakthrough has been made, whether it is luminous efficiency and product quality has been a qualitative improvement, LED application market has become increasingly widespread. With further increase of global market demand led street light, LED development is faced with great opportunities in the future, the industry is toward and will continue toward a greater variety, higher brightness, greater range of applications and lower cost direction.