Basic research lags behind the development of semiconductor lighting industry in China

Semiconductor lighting industry has become the commanding heights of industry in the post crisis era. According to the phenomenon that the basic research of our country lags behind the development of technology and market

Due to the huge demand for applications, the development of semiconductor lighting market leading technology development, technology research ahead of the characteristics of basic research. "In the topic recently held the Xiangshan Science Conference, Department of physics, Nanjing University professor Zhang Rong and other experts pointed out that the basic research of China's semiconductor lighting has been supported in the past 10 years, but also the absence. The basic research results have not been able to adapt to the rapid development of semiconductor lighting technology. Therefore, to speed up the semiconductor lighting a number of major scientific research on basic issues, to solve the technical bottleneck of industrial development, has been imminent.

Semiconductor lighting, is recognized as the second revolution in the history of lighting. "It is different from the traditional way of lighting, which has a great potential in luminous efficiency, life and environmental protection. The utility model has the advantages of safety, no stroboscopic, etc., and the utility model has no infrared and ultraviolet radiation, and can not cause two pollution. Zhang Rong introduction.

According to the theoretical expectations, semiconductor lighting luminous efficiency can reach about 400lm/W, is the expected efficiency of energy-saving lamps 3 - 4 times. The researcher at the Chinese Academy of Sciences Institute of semiconductors has Yiping analysis, according to the technical development is expected, if the semiconductor lighting luminous efficiency can reach more than 200lm/W, and replace the traditional lighting source, at least can make China's lighting electricity annually save more than 1/3. According to the current calculation of lighting electricity consumption, electricity saving nearly 100 billion degrees per year, more than the annual power generation of the Three Gorges project, and reduce carbon dioxide emissions by more than 100 million tons.

Reporters learned from the meeting, the current level of international semiconductor lighting products has reached 100lm/W, China's industrial level of around 80lm/W, has exceeded the luminous efficiency of energy-saving lamps.

Semiconductor lighting includes a series of basic materials, epitaxial materials, chips, packaging, two optical design, applications, etc., but the core of the impact of semiconductor lighting efficiency is the material and chips. At present, in the key white LED technology, although it has been applied in a certain range, but compared with the traditional lighting source and technology, did not show a clear advantage. Zeng Wei believes that how to achieve ultra high efficiency of semiconductor white light lighting, is the world's most important issues facing the field of semiconductor lighting.

Semiconductor lighting luminous efficiency per 10lm/W, the application market will expand 50%. Zhang Rong told reporters that the development of semiconductor lighting is characterized by market development ahead of technology development, technology development to promote market applications. But at present, because of the basic research of semiconductor lighting is relatively lagging behind, there are still many problems in the process of semiconductor light-emitting diode LED luminescence.

In this entitled "high nitride semiconductor materials and chip based white light illumination problem" Xiangshan Science Conference, Zhang Rong believes that the semiconductor lighting luminous efficiency, due to the basic science level, mainly is the optimization of high strain, strong polarization band nitride heterojunction structure design and implementation, epitaxial growth behavior dynamics and defect control and the key scientific problems in nitride heterostructure carrier recombination dynamics and photon propagation behavior control. It is because of the lack of understanding of these issues that affect the development of semiconductor lighting technology.

Semiconductor lighting is the commanding height of the industry in the post crisis era. Zhang Rong pointed out that due to the semiconductor lighting in terms of energy saving and emission reduction contains a huge market prospects, the United States, Japan and other countries have to promote the relevant science and technology plan.

The U.S. Department of energy in 2009 announced a solid state lighting (SSL) manufacturing research and development of product roadmap, and the laboratory to achieve 200lm/W luminous efficiency schedule, from the original in advance in 2020 to the year of 2015.

Analysis of the road map, we can see that the United States for this industry is a balanced, scientific deployment, covering all aspects of basic research, technology development, industrial engineering demonstration, marketing applications. In Zhang Rong view, its organizational framework is based on R & D institutions as the main body, market demand oriented, industrial platform for support.

"Our country should increase the support in the field of basic research. Zhang Rong said, from the current luminous efficiency of 100lm/W to 200lm/W, but also requires a number of years of effort, basic research needs further breakthroughs. "

Author: Chen Lei

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