LED (Light EmitTIng Diode), also known as light-emitting diode, uses solid semiconductor chips as light-emitting materials. When a forward voltage is applied to both ends, carriers in the semiconductor recombine, releasing excess energy and causing photons to emit visible light. The third revolution in the field of lighting brought by LED solid-state lighting will become the most effective means of energy saving and environmental protection. It will improve and improve the quality of human life by improving the human living environment and developing new concepts and models of lighting. In June 2003, under the support of the "863" plan, the Ministry of Science and Technology of China launched the "National Semiconductor Lighting Project" in the lighting field in a timely manner. In April 2004, the Ministry of Science and Technology determined the focus of work-the development of new-type lighting industry, and identified Fujian, Xiamen, Shanghai, Dalian and Jiangxi Nanchang as the first four national semiconductor lighting industry bases. With the support of the "863" plan and other scientific and technological programs, China has initially formed a relatively complete industrial chain from epitaxial wafer production, chip preparation, and device packaging integration applications. Academician Zheng You of the Chinese Academy of Sciences recently pointed out at the China (Nanchang) Semiconductor Lighting Industry Development Forum that as a new type of lighting technology, LED will lead to a revolution in the field of lighting due to its many advantages such as flexible application, green environmental protection and convenient adjustment. 1. The advantages of LED application in urban landscape lighting: 1. High efficiency: LED luminous efficiency is not high, but the LED spectrum is almost all concentrated in the visible light band, the light efficiency is about 65%, and the monochromaticity is good. It can directly emit colored visible light without filtering, and the light is very pure. The visible light efficiency of incandescent lamps is only 10-20%; 2. Low energy consumption: LED power is generally in the range of 0.03 ~ 1w, which can meet the needs of various modeling through the cluster mode. Because there is no ultraviolet in the spectrum, there is no heat and no radiation loss. When colored light is needed, its inherent color avoids the time-consuming, labor-intensive and energy consumption of the filtered white light. Does not form light pollution, is a real green light source; 3. Safe and reliable: The working voltage of the LED monomer is between 1.5 and 5V, and the working current is between 20 and 70mA, and there is no danger of human contact. The lamp body is encapsulated with epoxy resin, which has strong resistance to mechanical shock and vibration and is free of harmful substances such as mercury and sodium, which can be recycled; 4. Convenient management: Due to the above characteristics, LED light sources can be controlled in various ways, such as centralized control and decentralized control or adjustable control of points. By controlling the current dimming, different light colors are combined to adjust the color, and a control circuit is added to achieve a variety of dynamic changes. Its life span of more than 100,000 hours has reduced the maintenance workload of urban landscape lighting; 5. Social and economic benefits: Compared with traditional lighting tools, LED lighting products, especially GaN-based white LED light sources, are small in size, light in weight, good in directionality and resistant to various harsh conditions. Lifetime and environmental protection have unparalleled advantages, enough to cause a huge impact on the traditional light source market. With the breakthrough of the third-generation semiconductor material gallium nitride and the advent of blue, green, and white LEDs, the difficulty and risks of the LED lighting industry are much lower than those of the microelectronics industry, and they can take advantage of China's comparative advantage. In particular, the chip packaging and lighting system industry located downstream of the industrial chain is not only a technology-intensive industry but also a labor-intensive industry, which can give full play to China's human resources to drive related industries. China's current electricity used for lighting is close to 250 billion degrees per year, of which if semiconductor lighting can be used in 1/3, it can save about 80 billion degrees per year, which is basically equivalent to the annual power generation of the Three Gorges Power Station. 2. Application of LED light source in landscape lighting of Nanchang Relevant leaders of the Ministry of Science and Technology have proposed to promote the application of semiconductors in urban landscape lighting on the occasion of the 2008 Beijing Olympics and the 2010 Shanghai World Expo. The industrialization of semiconductor lighting has significant social benefits, as well as a sense of urgency and necessity. Nanchang has risen rapidly among inland cities in central China in recent years. As the lighting management department, we have developed and promoted the application of semiconductor products in urban landscape lighting earlier in cooperation with the transformation of the city and the beautification and lighting, as well as the construction of the national semiconductor industry base. In 2001, we first combined with Dalian Science and Technology Development Co., Ltd. to combine lighting with sculptures with cultural connotations and regional characteristics, using organic semi-transparent plates, transparent glass fiber reinforced plastics, etc. as the framework, cluster LED lights as the main light source, and using microcomputer control and other technologies to develop Produced "Qingshan Lake Pearl" and "Giant Thermometer". From 2002 to 2004, "Yuanyi Gaofei", "Pearl Lamp", "One Net Love", "Sky", "Skyward Visitors", "Skyward Visitors" were produced and installed in Nanchang Sports Park, Xianghu Lake, Qingshan Lake and Tengwang Pavilion. The light sculptures such as "Two Dragon Balls" basically use semiconductors as their main light source. Brilliant colors and changing lights make the night view of Nanchang City more charming, and also make Nanchang a unique "light sculpture city" in the national city lighting, making the original boring lighting become "daytime sculptures and attractions; At night it is lighting, it is a bright spot. " With the unique advantages of semiconductor lighting, "light sculpture" has become the finishing touch of city night lighting. After more than 20 years of hard work, Nanchang has made great progress in the research and industrialization of semiconductor luminescent materials and devices. It has certain advantages in industry, research and development and talents, and occupies an important position in the country. Its upstream epitaxial materials, midstream chip manufacturing, downstream device packaging and application products have all achieved large-scale production, and the varieties cover infrared, red, orange, yellow, green, blue, white and white LED products. The basis for mass production and development of high-end products. Among them, the upstream and midstream products of Lianchuang are the largest enterprises in mainland China, and Nanchang University is also a domestic leader in the research of semiconductor luminescent materials. Recently, the Ministry of Science and Technology conducted a nationwide investigation and demonstration, and Jiangxi ranks among the four relatively complete industrial regions of the semiconductor light-emitting materials and devices industry chain in the country. At the end of 2004, we cooperated with Lianchuang, and started to use LED lighting in a large area in the landscape lighting of Yudai River in Nanchang. Nanchang Yudai River was originally excavated in the south of the famous city in the 1950s. It was manually excavated in the 1950s and has a total length of 12.2 kilometers. It is a tree-shaped open channel and is divided into a main channel, a west branch, an east branch and a middle branch. In recent years, due to blocked rivers and poor drainage, it has become a "longxugou" in urban areas. Since 2000, the Nanchang Municipal Government has invested heavily to carry out comprehensive transformation. In addition to the drainage function, the Yudai River also has a landscape function. During this period, Chinese garden art and western garden landscaping merged together. The waterscape is intertwined as another place for people to relax. Moreover, the jade belt river, such as a necklace passing through the city, activates the Qingshan Lake, Xianghu Lake, East Lake, West Lake, Fuhe River and other lakes in Nanchang City. In 2004, the Yudai River was fully illuminated, and the Yudai River at night fell like the Milky Way, reshaping the water environment of the city. We pay attention to the combination of tradition and modernity in the design of the Yudai River lighting. We choose the "green lighting" method, with white as the main tone, and five levels of cross-strait lights. Under the guidance of the lights, visitors will have the feeling of moving easily. The LED lights are mainly used in the outline along the river, the lighting of 14 bridges, and the decoration of two tunnels. The layout is "one section with one color, one bridge with one landscape, one tunnel with one feature". Under the tone of white as the main light color, through the string lights, line lights, groups, etc. of the LED lights, the light distribution characteristics of the semiconductor light source itself are used to change "Hanwa streamer", "Dream into Jiangnan", " The lighting themes such as "Shenyang Yanming" and "Jade Belt Image" form a "shared, open, humane and artistic" river space, which activates the landscape resources and enhances the value of the waterfront area. 3. Conclusion We see that the current price of LEDs is generally higher than that of ordinary incandescent lamps and fluorescent lamps, and the biggest obstacle for high-power LED devices to obtain high flux is still the design of the chip's light extraction method and the high light efficiency packaging structure. These still need to be solved by research units and manufacturers relying on mass production to reduce costs and technological innovation. At present, the bottleneck of semiconductor light-emitting technology seems to focus on chip manufacturing and device packaging. But in the long run, the development of new materials is a top priority. Although the popularity of semiconductor lighting is not a distant matter, optimists think it is 5 years, and those who are not optimistic think it is 15 years. But our recent development goal should be special lighting, such as landscape lighting, decorative lights and other fields. As the urban lighting design and management department, we hope that the semiconductor (LED) can become the mainstream product of our urban landscape lighting as soon as possible, and replace the light sources such as high-pressure sodium lamps, high-pressure mercury lamps, metal halide lamps, etc. The night of the city is brightened. Dc Motor Fan,Smart Ceiling Fans,Ac Motor Fan Ceiling,Dc And Ac Motor Ceiling Fan Jiangmen MagicPower Electrical Appliances Co.,Ltd. , https://www.magicpowerfan.com