Demystifying the powerful green energy-saving advantages of LED lighting
Lighting knowledge | Luminous efficiency of fluorescent lamps
Recommended introduction: It is generally called the external quantum efficiency of the component, which is the product of the internal quantum efficiency of the component and the extraction efficiency of the component. The so-called internal quantum efficiency of the component is actually the electro-optical conversion efficiency of the component itself, which is mainly related to the characteristics of the component itself (such as the energy band, defects, impurities of the component material), and the barrier crystal composition and structure of the component. The extraction efficiency of a component refers to the number of photons generated inside the component that can actually be measured outside the component after being absorbed, refracted, and reflected by the component itself. Therefore, the factors regarding the extraction efficiency include the absorption of the component material itself, the geometry of the component, the component...
Home of lamps and lanterns news: The stage of CCTV Spring Festival Gala this year is extraordinarily beautiful, attracting hundreds of millions of viewers. The biggest highlight is the LED used in the audience. "All large-scale activities are now inseparable from LED, and this is just one of the many application fields of LED." Wu Ling, secretary general of the National Semiconductor Lighting Engineering Research and Development and Industry Alliance, told reporters.
In order to uncover the mystery of semiconductor lighting (LED) known as "green lighting", the reporter recently came to the Semiconductor Integration Technology Engineering Research Center of the Institute of Semiconductors, Chinese Academy of Sciences. Putting on a fully armed dustproof suit, after strict disinfection, and carefully understanding the precautions, the reporter followed the staff into the laboratory of the research center.
According to Li Jinmin, director of the Institute of Semiconductors, relying on the hardware facilities of the research center, the National Semiconductor Lighting Engineering R&D and Industry Alliance (hereinafter referred to as the Alliance) is building the State Key Laboratory of Semiconductor Lighting Joint Innovation, which will become an important breakthrough in my country's LED common key technologies. platform. The researchers told us that the preparation process here is completely set up according to the industrialization process, like a scaled-down production workshop.
Pointing to two wafer slices that seem to be indistinguishable, the researchers said their biggest difference, one is a sapphire substrate and the other is a silicon substrate. In the field of silicon substrates, my country has reached the world's advanced level, while The technical route of using silicon as the substrate material is becoming the leading route of the LED industry recognized by the world, which means that my country has certain advantages in the frontier field of LED.
In front of a working equipment, the researchers told reporters that this is a MOCVD machine independently developed by the Institute of Semiconductors, Chinese Academy of Sciences, which has been industrialized. It is a necessary equipment for the production of chips in the middle and upstream of the huge LED industry chain. Relying on imports, the annual import volume is 400 to 500 units, and the price of each unit is more than 20 million yuan. The price of my country's self-developed MOCVD equipment is only one-half of the imported equipment. Its localization not only gets rid of the dependence on imported equipment, but also significantly reduces the cost of LED products and is closer to the market.
LED is a light source and display device made of third-generation semiconductor materials. It has the characteristics of low power consumption, long life, no pollution, rich colors, and strong controllability. It is a revolution in the lighting source and light industry. The emergence of LED has not only ushered the century-old traditional lighting industry into the era of electronic large-scale digital technology, but also the application involves information, transportation, medical care, agriculture and other fields. First, it will lead to great changes in human production and lifestyle.
Since the "Tenth Five-Year Plan", the Ministry of Science and Technology has supported the development of semiconductor lighting technology and industry, launched the National Semiconductor Lighting Project, and continued to support the technological innovation of semiconductor lighting through national science and technology plans such as the Science and Technology Research Plan, the "863" Plan, and the Science and Technology Support Plan. and industrial development. The core technology R&D and innovation capabilities of my country's semiconductor lighting industry have rapidly improved, forming a relatively complete technological innovation chain of upstream epitaxial chips, midstream device packaging, and downstream integrated applications, and an industrial chain with strong international market competitiveness.
Compared with energy-saving lamps, it saves 50% of electricity and has a service life of more than several times. The advantages of LED are obvious, but there are also problems such as high prices, unstable performance of some products, and lack of breakthroughs in core technologies. Market application is an important means to solve these problems. In order to guide and cultivate the semiconductor lighting application market, in 2009, the Ministry of Science and Technology launched the pilot work of the semiconductor lighting application project (“ten cities and ten thousand lights”). As of September 2011, two batches of 37 pilot cities have concentrated nearly 4500 semiconductor lighting companies Enterprises, with a total output value of about 140 billion yuan.
In the upstream of the industry chain, the alliance is actively preparing to build the State Key Laboratory of Semiconductor Lighting Joint Innovation, making full use of and integrating existing advantageous research resources, activating the stock incrementally, and exploring the continuous investment and talent incentives of the country, research institutions and enterprises to participate in basic research. mechanism to form an open international R&D entity; in the middle and lower reaches of the industry chain, the alliance actively carries out application technology research, process design and system integration, develops modular, standardized and standardized products, and realizes multi-purpose and multi-functional innovative applications; A contract with legal effect, forming a public technology R&D entity with common investment, clear division of labor, clear responsibility and rights, sharing of intellectual property rights, and rapid industrialization of R&D results; adopting project joint investment, use priority, etc. R&D platform. Under the circumstance that there is no world standard for LED, among the technical specifications jointly proposed by the members of the alliance, 4 of them have become technical standards, which has made a breakthrough in actively seizing the commanding heights.
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