LED English abbreviation, the main meaning: LED = Light Emitting Diode, a solid-state semiconductor device that converts electrical energy into visible light, which can directly convert electricity into light; LED = Large ELectronic Display, large electronics Display; LED = Lupus erythematosus disseminatus, this entry mainly introduces LEDs.

LEDs have many uses, such as the relationship between the spectrum of visible light and the white light of LEDs. As everyone knows, the wavelength range of the visible light spectrum is 380nm ~ 760nm, which is the seven colors of light that can be felt by the human eye - red, orange, yellow, green, cyan, blue, purple, but the light of each of the seven colors is A monochromatic light. For example, the peak wavelength of red light emitted by an LED is 565 nm. There is no white light in the spectrum of visible light, because white light is not monochromatic light, but composite light synthesized by a variety of monochromatic lights, just as sunlight is white light synthesized by seven monochromatic lights, while in color televisions White light is also composed of three primary colors red, green, and blue. Thus, to make the LED emit white light, its spectral characteristics should include the entire visible spectral range. However, it is impossible to manufacture LEDs of this performance under the current process conditions. According to people's research on visible light, white light that can be seen by human eyes requires at least two kinds of light mixing, that is, two-wavelength light (blue light + yellow light) or three-wavelength light (blue light + green light + red light) mode. . The above two modes of white light require blue light, so the ingestion of blue light has become a key technology for manufacturing white light, that is, the "blue light technology" currently chased by major LED manufacturing companies. At present, there are only a few manufacturers that have mastered "Blu-ray technology" in the world, so the promotion and application of white LEDs, especially the promotion of high-brightness white LEDs in China, has a process. Therefore, LED enterprises should strengthen professional and technical human resources training, set up a high-level, stable R & D team, and continuously improve China's research and innovation capabilities.

Innovation difficulty and development bottleneck

China started late in the LED industry, and there are only a handful of manufacturers engaged in upstream LED epitaxy and chip production. According to statistics, China's LED chip supply currently accounts for only 8% of global demand. In the mainland LED market, domestic chips account for only 52% of demand. Although the LED industry in the mainland has developed rapidly in recent years, and the innovation capability of enterprises has been outstanding, the difficulty of innovation and the bottleneck of development have gradually emerged.

The bottlenecks and difficulties faced by LED companies in the process of product and technology innovation and industrialization are the three major issues of patents, talents and costs. The specific performance is:

First, the mainland LED patent application is less, and it started late. To obtain core patents, long-term, high-level research results are still needed. With the rapid development of the domestic LED industry, occupying the commanding heights of the international market has become a medium- and long-term goal. As a result, LED epitaxy and chip patent issues are particularly prominent, and it has become the first problem to be solved in the development process of LED enterprises;

Second, the shortage of professional and technical personnel is still a common problem faced by LED companies. Third, LED epitaxy and chip manufacturing equipment and main raw materials are difficult to localize. At present, in the above demand, it still relies on imports. As the LED industry moves toward the ultimate goal of generalization, reducing costs has become a problem that must be faced in production.

Therefore, it is necessary to strengthen the training of professional and technical personnel, establish a high-level and stable R&D team, and continuously improve China's research and innovation capabilities. Through the independent innovation to form part of the core patent technology, to overcome the key industrialization technologies urgently needed by the country, to establish a sound technological innovation system and characteristic industrial clusters, to form China's internationally competitive semiconductor energy-saving emerging industries.

Preferential policies should be issued

At present, China has a certain focus on supporting the policy, support and personnel training of the semiconductor lighting industry, but overall, there is still a big gap with other pillar industries. As for the innovation environment, the most urgent issue is still the talent issue. The development of China's LED industry started late, and there are very shortages of professional and technical talents. Domestic enterprises need to accelerate the improvement of their innovation ability in the development. They must introduce high-paying professional and technical talents from abroad or Taiwan, which will undoubtedly improve the manufacturing of developing industries. cost.

The industry believes that the state has introduced some preferential policies for the introduction of LED manpower, which is conducive to enterprise innovation and development. At the same time, it is necessary to increase the cultivation and output of domestic talents.