LED Lighting: Developing Silicon Substrate LED Technology

As a strategic emerging industry for energy conservation and environmental protection, LED lighting has been highly valued by the state and local governments at all levels. With the advancement of technology, the LED lighting industry will surely become a new growth point for the future electronic information industry. Then, from what aspects should the “Twelfth Five-Year Plan” period start, strengthen independent innovation, and develop China's LED lighting industry? Through multi-party investigation, the reporter suggested that key support should be given from the following three aspects: First, improve and develop silicon substrate LED technology; Second, support the core equipment MOCVD localization; Third, further advance the high-power white LED technology advancement. In the next five years, only when we make great efforts to support the development of LED technology with independent intellectual property rights, and at the same time break through the upstream core equipment and material bottlenecks, and promote the application of high-power white LEDs, we can grasp the initiative of development, and we can find a difference from developed countries. The development of LED lighting technology with distinctive international characteristics forms an internationally competitive LED lighting industry in China, contributing to China's energy saving and emission reduction.

According to the substrate division used for the preparation of LED upstream materials, there are three technical routes that have been industrialized, namely sapphire substrate semiconductor illumination, silicon carbide substrate semiconductor illumination, and silicon substrate semiconductor illumination. The core patents of the first two technical routes are mainly in the hands of Japan, Europe, Toyota Synthetic, Cree, Osram, Philips, etc., and the patents applied by Chinese enterprises are mainly concentrated on the periphery. Core patents, products sold to foreign markets are subject to patent restrictions. The silicon substrate LED technology is one of the few original technologies with independent intellectual property rights in China's high-tech field. Nanchang University has broken through dozens of key technologies of silicon substrate LEDs, and successfully developed silicon substrate LED materials and chips. Achieve mass production.

At present, many units or research institutions in the world have stepped up the research and development of silicon substrate semiconductor lighting technology. Several LED giants in the LED industry, TSMC and Samsung are developing LED substrates. At present, China is leading the world in terms of silicon substrate LED technology and industry. If we want to continue to maintain the leading level, we must increase our support during the “Twelfth Five-Year Plan” period, so that China will become a leader rather than a follower in the field of LED lighting in the future. Supporting the development of silicon-based LED technology should not hesitate. At present, silicon substrate LED products have reached the upper middle level of the first two technical routes, and there are still some problems to be solved from the first-class level. Therefore, the national support and investment is of great significance to the development of China's LED lighting industry.

In addition, research on upstream core equipment MOCVD should be taken seriously. MOCVD production equipment is not currently available in China. In the face of such a situation, it is imperative to make great efforts to support the localization of core equipment MOCVD. The launch of the localization project for MOCVD equipment will now be fully possible to take the initiative in the future generations of MOCVD equipment manufacturing.

Zhang Wansheng, Professor of the 13th Research Institute of China Electronics Technology Group Corporation

Promote and develop the LED lighting industry in stages

It is not enough to mention the localization of equipment. It should also pay attention to the utilization rate of (production) lines of domestically produced equipment. The localization rate of packaging equipment during the “Twelfth Five-Year Plan” period should be greater than the localization utilization rate of chip manufacturing equipment.

The steps for the promotion and application of the "12th Five-Year" LED white light lighting should be from indoors to outdoors. Outdoor applications can start from tunnel lights to street lights. Street lamps should not be used for demonstration projects. They should first engage in the test section (engineering). Through testing and exposing problems and solving them, we will continue to improve and finally become a new product designed and finalized.

Our country's silicon substrate LED technology was developed by Nanchang University through independent innovation. Thirteen semiconductor lighting research and development centers and the National Semiconductor Quality Supervision and Inspection Center tested a batch of silicon substrate 1mm × 1mm power chip sent by Jingneng Company. At 350mA, the peak wavelength is 450nm and the radiated power is above 350mW. The highest level of domestic power chips. At a shell temperature of 70 ° C, 700 mA current is electrified and aged for 168 hours, and its light decay is within 5%. This is the new dawn of the development of power LED technology in China. During the "Twelfth Five-Year Plan" period, the state should continue to give greater support to the silicon substrate technology, make it more perfect, and form a batch production capacity with a certain scale.

Chairman of Foshan Guoxing Optoelectronics Wang Haohao

Encourage high-power white LED packaging technology to innovate independently

Commercialized GaN-based LED substrates are mainly sapphire, SiC and silicon. Japan Nichia Corporation monopolizes the patented technology of GaN-based LEDs on sapphire substrates. American Cree has monopolized the patented technology of GaN-based LEDs on SiC substrates, while silicon The patented GaN-based LED technology on the substrate is owned by China and is an important technical route for the LED industry to break through the international patent blockade. Of course, GaN technology, which is the mainstream of industrialization, still needs attention. After all, the current market competition is still the competition of GaN substrate chips. If you do not pay attention to it, it will give up market competition. The localization of core equipment such as MOCVD is of great significance for improving independent research and development capabilities and improving competitiveness. High-power white LEDs are an important part of moving toward general lighting, replacing traditional lighting, and becoming an energy-efficient lighting method.

The continuous innovation and breakthroughs in the above aspects will greatly enhance the competitiveness of China's LED industry and should be the key support and development area for China in the next five years. As a packaging company, it needs to be further refined in high-power white LED packaging technology, including new materials and structures, efficient packaging processes, and efficient packaging equipment, which are very important research topics. It is recommended that the state set up special projects in the science and technology plan to encourage independent innovation.

Pan Jiangen, Chairman of Hangzhou Yuanfang Optoelectronics Co., Ltd.

Conduct research on LED product testing technology

Based on the current development status of the domestic semiconductor lighting industry, it is recommended to further develop China's advantages in the field of downstream application products, promote the upstream technological advancement and process improvement of China through the development of the downstream market, and actively carry out research and standardization of detection technology of LED products, and Establish a network-based testing platform to standardize the semiconductor lighting market, reduce the losses caused by disorderly development, and at the same time establish a good image of China's semiconductor lighting products in the international arena, and strive to occupy the international commanding heights in the field of applied products.

LEDs have entered the field of general lighting and are developing very rapidly. It is recommended to focus on the development of LED lamps, indoor lighting fixtures, lawn lamps, garden lamps, street lamps and other products that can replace traditional lighting products, to improve the maturity of the corresponding products, paying special attention to its light efficiency, light distribution performance and reliability. Improve product quality through standards and testing methods, and standardize semiconductor application products. Due to the variety of semiconductor lighting products, we encourage research and innovation within a certain standard range to provide more energy-efficient and comfortable lighting products. At the same time, it is recommended to strengthen investment in basic research in the upstream epitaxy and chip fields, and promote the localization of upstream technologies and products. If possible, it is expected to break the foreign patent blockade through independent innovation and realize the development of white LED technology with independent intellectual property rights.

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