LED green light source expects technology to break through

On July 29, the "International Conference on LED Industrialization and Application of the Chinese Academy of Engineering" was held in Taiyuan, Shanxi Province. Eleven academicians of the Chinese Academy of Engineering and more than 100 experts and scholars conducted in-depth discussions on LED industrialization and application.

From concept heat to discipline construction

"In the past few years, China's LED heat is only a concept heat, not the heat of innovation, R & D. Due to the lack of core technologies and patents, low-level blind investment is serious. 70% of enterprises in China can only dwell on the lower threshold The low-tech packaging and assembly links compete with each other at a low level, said Zhou Lian, an academician of the Chinese Academy of Engineering.

In previous years, at home, experts and scholars of some R&D institutions and lighting companies were only a “concept” for the development and industrialization of high-brightness light-emitting diode epitaxial wafers and power chips, and high-end semiconductor lighting. After all, it is the cutting-edge technology of 'green lighting' in the world.

Compared with traditional lighting products, its low energy consumption, long life, high light efficiency, lamps with mercury-free, flicker-free characteristics, energy saving and environmental protection, lower power consumption, long life, with the advantages of traditional lighting can not be compared.

Director of the semiconductor lighting research and development center of the Chinese Academy of Sciences and director of the laboratory of semiconductor lighting innovation in China, Li Jinlu, said that as a new generation of light sources, LED lighting will be one of the greatest inventions in the field of lighting after Edison invented incandescent light bulbs.

Wu Ling, Secretary General of National Semiconductor Lighting Engineering R&D and Industry Alliance, said that due to the many specific advantages of LED lighting, in June 2003, the National Ministry of Science and Technology took the lead in establishing the “National Semiconductor Lighting Project Coordination Leading Group”, which opened the domestic LED lighting industry. Prologue. In early 2009, the Ministry of Science and Technology launched the pilot project of the "Ten Cities, Ten Thousand Peoples" semiconductor lighting application project, setting off a domestic climax of LED street lighting. In October 2009, in response to the development of domestic LED lighting, the six ministries and commissions of the National Development and Reform Commission and the Ministry of Housing and Urban-Rural Development issued the “Opinions on the Development of LED Lighting Energy-Saving Industry”, which clarified China's LED lighting industry's development goals by 2015. In February 2013, in order to guide the healthy and orderly development of semiconductor lighting energy-saving industry and promote energy-saving and emission reduction, six ministries and commissions including the National Development and Reform Commission prepared the “Semiconductor Lighting Energy-saving Industry Plan” and proposed the development goals and tasks for LED lighting energy-saving industries by 2015. And measures.

Due to the support of national policies, some domestic companies have expanded blindly, but there has been no breakthrough in the development of core technologies. According to Li Xuemin, a researcher at the Lehigh University Semiconductor Center and a chief scientist at Veeco at the time, Prof. Xu Heshe, vice president of Taiyuan University of Technology, made a special trip to the United States to discuss the development of LED core technology. After returning home, Dr. Xu Heshe, winner of the National Outstanding Youth Fund, was The new materials engineering research center was established. The industry's top experts, high-level enterprise engineers and university researchers all joined the team, forming the most professional and most comprehensive R&D team in the LED field. Some well-known domestic universities and research institutes have successively carried out LED research and development.

From discipline construction to intellectual property invention patents

The third-rate enterprises are hard-working, the second-rate enterprises are selling products, the first-class enterprises are selling patents, and the first-class enterprises are selling standards. Through several years of painstaking research, China's LED industry and application have basically taken shape.

Taiyuan University of Technology uses core patents and integration technology to break through, so that China's main components for lighting high-end system integration products no longer rely on imports, but also broke the foreign monopoly of advanced technology and patents in the field of semiconductor lighting, in the world of semiconductor lighting industry The initiative. "High-brightness blue and green LED epitaxial wafers and their chips" have been recognized as national key new products by the four ministries and commissions in 2004, and key products such as LED, LD epitaxial wafers and chips have reached the international advanced level.

Wu Ling said that at present, China has applied for more than 50 patents in the core technology of LED lighting, which has solved the problems of short LED lamp life, severe glare, poor energy saving effect, heavy and bulky, and high prices. The system integration technology has become a breakthrough and has become a leader in the industry.

One catches the patented technology and one catches the brand service. "The LED lighting industry chain is long and there are many key technology points. Most companies can take a lead at a certain point. The advantages of domestic R&D institutions lie in leading technical points, comprehensive technologies, and integrated technology leading the nation." During the seminar, the Chinese Academy of Engineering Academician Zhao Liancheng thinks.

While most companies are still burying their products, Taiyuan University of Technology has begun to export patents, technologies, management, brands and standards. At present, domestic R&D institutions use scientific research results and patented technologies to turn productivity into a starting point, and in the form of technology shares and technical support, they have quietly begun to expand and expand.

At the seminar, Li Jinyun said that LED lighting is known as the most promising green lighting source in the 21st century. As a strategic emerging industry, LED lighting industry can promote the upgrading of traditional industries and is widely concerned by countries around the world. And regions have actively implemented semiconductor lighting development plans and stepped up the LED lighting industry layout.

From Invention Patent to LED Industrialization Development

In February 2013, in order to guide the healthy and orderly development of semiconductor lighting energy-saving industry and promote energy-saving and emission reduction, six ministries and commissions including the National Development and Reform Commission prepared the “Semiconductor Lighting Energy-saving Industry Plan” and proposed the development goals and tasks for LED lighting energy-saving industries by 2015. And measures.

The plan points out that the LED energy-saving lighting industry will grow by an average of 30% annually and reach 450 billion yuan in 2015. In addition, the plan clearly stated that by 2015, all 60W incandescent lamps used in general lighting will be eliminated, market share will drop below 10%, LED functional lighting market share will reach more than 20%, and LED backlighting and landscape lighting market Occupancy rate reached 70% and 80% respectively. This will guide the healthy and orderly development of the semiconductor lighting industry, and it will also have important significance for the start-up of the semiconductor lighting market.

Academician Zhou Lian believes that under the promotion of the country and policy support, the manufacturing cost of China's LED lighting products has continued to decline. The demand for LED lighting market has continued to expand, and it has formed a certain industrial scale, but there are also many problems. First, the technical support for sustainable development is insufficient, R&D support is insufficient, and power is dispersed; Second, industrial resources do not converge, and the industrial structure urgently needs to be integrated. The scale of enterprises is small and scattered, the degree of concentration is not high, the distribution of industrial regions is decentralized, and there is a shortage of high-end products and leading talents. Third, the development environment needs to be optimized, policies do not form a joint force, standards, testing and certification systems need to be improved; Fourth, the lack of Core technology patents, cooperation between production, education and research are loose. Although the LED luminous efficiency has been continuously improved, there are still problems that need to be solved, such as low electro-optical conversion efficiency, poor heat dissipation performance, color rendering index of warm white LED lighting, and difficult color temperature control.

After the new and old experts and scholars have devoted themselves to painstaking research and long-term hard work, the industrialization and application of LDE and LD in our country are moving in a direction with bright future and good momentum of development.