Now, we can see the shadow of LEDs (light-emitting diodes) everywhere: it flashes in front of our computer; reveals its brilliant smile in the neon lights of the city; it is a beam of light in the new flashlight in the dark; it also forms the center of the square The brilliance of the TV wall city and the world comes from the efforts of scientists. According to the Nobel official website, Japanese scientists Akasaka, Amano and Japanese-American scientist Nakamura Shuji won the 2014 Nobel Prize in Physics for inventing high-brightness blue LEDs. The Nobel Prize Selection Committee said in a statement that three The winners made a significant contribution to the invention of a new efficient, environmentally friendly light source, the blue LED. By borrowing blue LEDs, white light can be created in new ways. With LED lights, we can have more durable and efficient lighting instead of the original light source, which not only saves a lot of energy for humans, but also illuminates more places around the world. Blue LED, later in 1907, Henry, a British engineer working at Marconi Electronics in the UK. For the first time, Joseph Lauder observed electroluminescence in a piece of silicon carbide crystal. He applied a voltage between the two contacts of a silicon carbide crystal and found that at low voltages, yellow light can be seen; at high voltages, more colors of light can be seen. The luminescence phenomenon also laid the physical foundation for the invention of LEDs. In 1962, Nick, a 34-year-old general researcher at General Electric in the United States. He Lunak invented an LED that emits red visible light, and his name is red with the red light of the LED. Since Helenak's invention was widely used, he was generally called the father of LEDs. In 1972, Helen Yak’s student George. Crawford stood on the shoulders of giants and invented the first orange-yellow LED, which is 10 times brighter than previous red LEDs, marking the first step in the direction of LEDs to improve luminous efficiency. By the end of the 1970s, LEDs had appeared in red, orange, yellow, green, green and other colors, and were used as display light sources for machine instruments, but still no blue LEDs. Because the three primary colors of light contain red, green, The absence of blue and blue light sources makes the white light source of illumination always unavailable. The market value of blue LEDs is huge, and it was also a worldwide problem at that time, attracting countless scientific heroes to compete. In 1973, Akasaki, who was at the Tokyo Research Institute of Matsushita Electric Co., Ltd., first started research on blue LED. Later, Akasaka and Amano co-founded the basic research and development of blue LED in Nagoya University. In 1989, the blue LED was successfully developed. In 1993, Nakamura Shuji, a 39-year-old working at Nichia Corporation, finally invented. A blue LED with commercial application value based on gallium nitride and indium gallium nitride has triggered a new revolution in lighting technology. With this invention, he won the 2006 Millennium Technology Award, which is equivalent to Nobel in the scientific community! Soon after, people added yellow phosphors to the blue LEDs to get white LEDs. Using this phosphor technology, LEDs of any color (such as purple light and pink light) can be produced. The emergence of blue and white LEDs has broadened the field of application of LEDs, making applications such as full-color LED display and LED lighting possible. Young and promising. At present, lighting technology is undergoing an unprecedented revolution, from light bulbs and fluorescent lamps to LEDs. In 1879, the American inventor Thomas. Edison invented the light bulb. In the early spring of 1882, the first practical incandescent lamps finally came out. It brought light and joy to thousands of families. The incandescent lamp is one of Edison's most brilliant contributions to mankind. But the incandescent lamp invented by Edison also has the disadvantage that its efficiency is very low, about 16 lumens per watt, which is equivalent to converting only 4 electrical energy into light energy. Peter, 1900. Cooper-Hught invented fluorescent lamps with efficiencies as high as 70 lm/W. Current white LEDs exceed 300 lumens per watt, and white LEDs used for illumination are often based on high-brightness blue LEDs that excite a fluorescent phosphor so that blue light is converted into white light. . These high-quality LEDs have a lifespan of up to 100,000 hours, compared to one-tenth the life of fluorescent lamps, which is one percent longer. The cost of white LEDs is gradually decreasing, and the market is also rapidly expanding. In the near future, tri-color LEDs may replace the combination of blue LEDs and phosphorous phosphors for high-brightness illumination, a technology that will allow us to dynamically control the color composition. Now, we can see a variety of novel colors in the LED market, such as light green and pink. In addition, the use of white LEDs can save a lot of energy for humans, given that lighting accounts for 200 of the world's total power consumption, and new white LEDs consume only one-tenth the energy of ordinary light bulbs. At the same time, LEDs help save material consumption due to the long life of LEDs of up to 100,000 hours, compared to 1,000 hours for incandescent bulbs and 10,000 hours for fluorescent lamps. Today, GaN-based LEDs have become a key technology for backlit LCDs in many mobile phones, tablets, computer surveillance devices, and TV screens. Gallium-emitting diode lasers that emit blue and ultraviolet light are also used in high-density DVDs, greatly facilitating the development of music, picture and film storage technologies. In the future, people may use ultraviolet-emitting gallium nitride aluminum/gallium nitride LEDs to purify water, because ultraviolet rays can kill bacteria, viruses, and microbial DNA. In addition, the world's lack of power grid population will exceed 1.5 billion, LED lights The emergence of them gave them hope, because of the low power consumption of LEDs, some local cheap solar energy is enough to power them. Although only 20 years old, the blue LED has brought great benefits to mankind, and also achieved the Nobel Prize founder Alfred. Nobel’s last wish for the benefit of mankind is a deserved award. The Nobel Prize Selection Committee stated in its statement on the achievements of the award: incandescent lamps illuminate the 20th century, and the 21st century will be illuminated by LED lights. It is not known how far LEDs can develop. Maybe one day I can develop LEDs that emit X-rays. Early LEDs can only be used in lights, calculator displays, and digital watches, but now they are starting to appear in the field of ultra-brightness. High-power LED devices are currently emerging LED products, which are mainly used in lighting, but this technology is still not very mature, mainly because high-power LEDs, although high in brightness, have a large amount of heat and are expensive. From the introduction of the semiconductor PN junction luminescence theory in 1907, to the ubiquity of LED technology today, during the course of more than a century, countless scientists including Chisaki, Amano and Nakamura have invested tremendous efforts in the development of LED. The economic and social benefits brought by LED will be incomparable.
PVC Resin
PVC Resin is easy to process, and can be processed by molding, lamination, injection molding, extrusion, calendering, blow molding and other hollow methods. Polyvinyl chloride is mainly used to produce artificial leather, film, wire sheath and other plastic soft products, but also can produce plates, doors and windows, pipes and valves and other plastic hard products.
PVC Resin usually inculde carbide based and ethylene based. K66-K68 PVC RESIN, K59-K55 PVC RESIN, K71-K73 PVC RESIN. PVC RESIN SG5, PVC RESIN SG3, PVC RESIN SG8.
According to the different application scope, PVC can be divided into: general-purpose PVC resin, high polymerization degree PVC resin, and cross-linked PVC resin. General-purpose PVC resin is formed by the polymerization of vinyl chloride monomer under the action of initiator; high degree of polymerization PVC resin refers to the resin polymerized by adding chain extender to the vinyl chloride monomer polymerization system; cross-linked PVC resin is A resin polymerized by adding a crosslinking agent containing diene and polyene to the vinyl chloride monomer polymerization system.
According to the method of obtaining vinyl chloride monomer, it can be divided into Calcium Carbide method, ethylene method and imported (EDC, VCM) monomer method (the ethylene method and imported monomer method are commonly referred to as ethylene method).
According to the polymerization method, polyvinyl chloride can be divided into four categories: suspension polyvinyl chloride, emulsion polyvinyl chloride, bulk polyvinyl chloride, and solution polyvinyl chloride. Suspension process polyvinyl chloride is the largest variety in output, accounting for about 80% of the total output of PVC. Suspension method PVC is divided into six models according to absolute viscosity: XS-1, XS-2--XS-6; XJ-1, XJ-2--, XJ-6. The meaning of each letter in the model: X-suspension method; S-loose type; J-compact type.
Pvc Resin,Pvc Resin Powder,Pvc Resin Sg5,Pvc Resin K67
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