Broad basic research in the semiconductor lighting market still needs to be strengthened

The semiconductor lighting industry has become the industrial commanding height in the post-crisis era. In response to the phenomenon that China's basic research lags behind technology and market development, experts call for -

“Because of the huge application requirements, the development of semiconductor lighting has experienced the development of market-leading technology, and the research of technology is ahead of the characteristics of basic research.” At the Xiangshan Science Conference on related topics held recently, Zhang Rong, a professor of physics at Nanjing University, and other experts pointed out that Although China's semiconductor lighting basic research has received some support in the past 10 years, it is also absent. The basic research results accumulated in the early stage can no longer meet the rapid demand for the development of semiconductor lighting technology. Therefore, it is urgent to accelerate the research on several major basic scientific issues of semiconductor lighting and solve the technical bottleneck of industrial development.

Semiconductor lighting is recognized as the second revolution in the history of lighting. "The way of illuminating is completely different from that of traditional lighting, and it has great potential advantages in terms of luminous efficiency, life and environmental protection. It has the characteristics of safety, no stroboscopic, and no infrared or ultraviolet radiation, and will not cause two. Secondary pollution." Zhang Rong introduced.

"According to theoretical expectations, the luminous efficiency of semiconductor illumination can reach 400 lm/W, which is 3-4 times the expected efficiency of energy-saving lamps." Zeng Yiping, a researcher at the Institute of Semiconductors of the Chinese Academy of Sciences, analyzed the expected luminous efficiency of semiconductor illumination sources according to technical development. More than 200lm / W, and replace the traditional lighting source, at least can save more than 1/3 of China's lighting power every year. According to the current lighting power consumption, the annual power saving is nearly 100 billion kWh, which exceeds the annual power generation of the Three Gorges Project and reduces carbon dioxide emissions by more than 100 million tons.

The reporter learned from the meeting that the current level of semiconductor lighting products in the world has reached 100lm/W, and China's industrial level is around 80lm/W, which has exceeded the luminous efficiency of energy-saving lamps.

Semiconductor lighting includes a series of materials such as basic materials, epitaxial materials, chips, packaging, secondary optical design, applications, etc., but the core of the luminous efficiency of semiconductor lighting is materials and chips. "At present, in the key white LED technology, although it has been applied in a certain range, it does not show obvious advantages compared with the traditional illumination source and technology." Zeng Yiping believes that how to achieve ultra-efficient semiconductor white light illumination It is the most important issue facing the world of semiconductor lighting.

“For every 10 lm/W of semiconductor lighting luminous efficiency, the application market will expand by 50%.” Zhang Rong told reporters that the development of semiconductor lighting is characterized by market development ahead of technology development and technology development to promote market applications. However, at present, because the basic research of semiconductor lighting is still relatively lagging behind, many basic problems in the process of semiconductor nitride core nitride LED illumination are not fully understood or controversial.

In this Xiangshan Science Conference entitled "High-efficiency Nitride Semiconductor White Light Illumination Materials and Chip Basic Issues", Zhang Rong believes that the efficiency of semiconductor illumination is attributed to the basic science level, mainly due to high strain and strong polarization of nitrides. Optimum design and implementation of the energy band of the structure, nitride epitaxial growth kinetics and defect behavior control, nitride heterostructure carrier kinetics and photon transfer behavior control are key scientific issues. It is precisely because the understanding of these issues is not deep enough, which has affected the development of semiconductor lighting technology.

"Semiconductor lighting is the industrial commanding height in the post-crisis era." Zhang Rong pointed out that because semiconductor lighting has a huge market prospect in terms of energy conservation and emission reduction, the governments of the United States, Japan and other countries have promoted relevant science and technology plans.

In 2009, the US Department of Energy announced a product roadmap for solid-state lighting (SSL) manufacturing R&D, and the lab's timeline for achieving a luminous efficiency of 200 lm/W was advanced from 2020 to 2015.

"Analysis of this roadmap shows that the United States is a balanced and scientific deployment of this industry, covering all aspects, basic research, technology development, industrialization engineering demonstration, and marketing application." In Zhang Rong's view, its organization The framework is based on R&D institutions, market demand is oriented, and industrialization platform is the support.

"And China should increase its support in the field of basic research." Zhang Rong said, "From the current 100lm/W luminous efficiency to 200lm/W, it will take several years of efforts, and basic research needs further breakthrough."

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