LED packaging and lamp development have become a fast-growing field1

After years of development, China's LED industry chain has been perfected day by day. Enterprises are located in various industrial links such as LED substrate, LED extension, LED chip, LED packaging and LED application. Looking at the overall industrial chain, due to the high demand for technology and capital in the upstream industry, domestic enterprises are rarely involved, so the industry has the characteristics of small number of enterprises and small scale. In contrast, downstream packaging and applications have relatively low capital and technical requirements for enterprises, which precisely matches the characteristics of domestic enterprises with less capital and weak technology. Therefore, there are a large number of enterprises engaged in these two links in China. This uneven distribution of enterprise structure has LED to the fact that China's LED industry is dominated by low-end products, and enterprises have long faced severe price pressures. With the sharp decline in the cost of LED upstream epitaxial chips in the past two years, upstream epitaxial chips, Midstream packaging and downstream applications have formed a market scale ratio of 1:4:9. Judging from the overall upstream investment situation, the growth rate of epitaxial wafer investment dropped from 46 in 2011 to 10 in 2012, while the growth rate of downstream application investment 2011 to 21, and rose to 53 in. therefore, the investment focus of the LED industry has shifted from upstream to downstream. The upstream link has high technical content, large capital investment, large quality influence and high profit margin. The luminous color and luminous efficiency of LED are related to the materials and process of making LED. and the upstream accounts for about 70 of the manufacturing cost of LED, which is extremely important to the LED industry; The Midstream is a technology-and capital-intensive link, and the chip is currently a link with fierce patent competition, which has the characteristics of high investment intensity but slow effect; The downstream links include the development, production and application of LED packaging and lamps, which are closely related to the market, with relatively low technical content and low investment threshold. therefore, it is a large-scale and fast-developing field in the LED industry. In the production of LED upstream epitaxial wafers and chips, the United States, Japan and the European Union still have huge technological advantages, while Taiwan has become an important LED production base. At present, a three-legged industrial pattern dominated by the United States, Asia and Europe has been formed, with Japan, the United States and Germany as the industry leaders, followed by Taiwan and South Korea in China. the distribution of echelons actively followed by China, Malaysia and other countries and regions. Although there is still a certain gap between China and the international advanced level in the production technology of LED epitaxial wafers and chips, the huge domestic application demand has brought huge development opportunities to LED downstream manufacturers. domestic LED application products such as display screens and landscape lighting lamps have been exported to the United States, the European Union and other countries and regions. At present, the main research institutions of extension and chip in China include Peking University, Tsinghua University, Nanchang University, Institute of Semiconductors of Chinese Academy of Sciences, Institute of Physics, 13 China power, South China Normal University, Beijing University of Technology, Shenzhen University, Shandong University and Nanjing University. wait, technically, it mainly solves the problems of growing GaN epitaxial layer on silicon substrate, wavelength drift of GaN-based blue light, improving internal quantum efficiency and light emitting efficiency, improving light attenuation resistance and heat dissipation level of power chip, etc.