The PDP industry has great market potential. The market for phosphors for PDP is very promising. It has become an urgent task to develop high-efficiency, low-light-emitting phosphors for white LEDs. The application of phosphors on color LEDs is still in its infancy and requires in-depth research. The PDP phosphor market has broad prospects for color PDPs, and the three-primary fluorescent materials excited by vacuum ultraviolet radiation (VUV) used in color PDPs are key materials for realizing color PDPs. Therefore, it is of great significance for the research and production of trichromatic fluorescent materials for color PDP. At the same time, color PDP fluorescent materials will become another high-tech field in the application of luminescent materials after color TV and compact energy-saving lamps, which is of great significance to the application of rare earth resources in China. We have carried out research on the industrialization of color PDP fluorescent materials in 2001, and passed the acceptance of the National Development and Reform Commission in September 2004. We have developed a PDP phosphor luminescence performance test system to solve the problem of domestic PDP phosphor test; mastered the complete engineering technology for preparing high-efficiency PDP phosphors; built the first domestic report in Beijing Nonferrous Metals Research Institute Test line for PDP phosphors. These have laid a good foundation for the industrial production of PDP phosphors in China. In 1999, the amount of PDP fluorescent materials in Japan was 10 tons, and the amount of PDP fluorescent materials in the world was 20 tons. It is expected that by the end of 2005, the annual production of PDP worldwide will greatly exceed this figure. LED phosphors have yet to be innovated In recent years, the most interesting event in the field of lighting is the rise of semiconductor lighting. In the mid-1990s, Naka?é„„mura and others of Japan Nichia Corporation broke through the key technologies for manufacturing blue light-emitting diodes (LEDs) through unremitting efforts, and developed a white light source that is covered with a fluorescent material to cover blue LEDs. technology. Semiconductor lighting has the characteristics of green environmental protection, long life, high efficiency, energy saving, harsh environment, simple structure, light weight, light response, fast response, low working voltage and good safety. Therefore, it is known as the fourth generation of lighting electric light source after incandescent lamp, fluorescent lamp and energy saving lamp, or called 21st century green light source. The United States, Japan and Europe have injected a lot of manpower and financial resources, and set up special institutions to promote the development of semiconductor lighting technology. LEDs have many ways to achieve white light, and the way to develop earlier and industrialized is to apply phosphor on the LED chip to achieve white light emission. LEDs use phosphors to achieve white light. There are three main methods, but they are not fully mature, which seriously affects the application of white LEDs in lighting. Specifically, the first method is to apply a yellow phosphor that can be excited by blue light on the blue LED chip, and the blue light emitted by the chip complements the yellow light emitted by the phosphor to form white light. This technology is monopolized by Nichia Corporation of Japan, and a principle disadvantage of this scheme is that the emission spectrum of Ce3+ ions in the phosphor does not have continuous spectral characteristics, and the color rendering property is poor, which is difficult to meet the requirements of low color temperature illumination. At the same time, the luminous efficiency is not high enough, and it needs to be improved by developing a new type of high-efficiency phosphor. The second implementation method is to apply green and red phosphors on the blue LED chip, and the blue light emitted by the chip is combined with the green light and the red light emitted by the phosphor to obtain white light, and the color rendering property is good. However, the effective conversion efficiency of the phosphor used in this method is low, and in particular, the efficiency of the red phosphor needs to be greatly improved. The third method is to apply a phosphor of three primary colors or multiple colors on a violet or ultraviolet LED chip, and use the long-wave ultraviolet light (370 nm-380 nm) or violet light (380 nm-410 nm) emitted by the chip to excite the phosphor. And achieve white light emission. This method has better color rendering, but there are also problems similar to the second method, and the red and green phosphors with higher conversion efficiency are mostly sulfide systems. Such phosphors have poor light-emitting stability and large light decay, so it has become an urgent task to develop high-efficiency, low-light-emitting phosphors for white LEDs. We are the first research institute in China to conduct high-efficiency, low-light-reduction phosphors for LEDs. Recently, color LEDs using phosphors have been developed through joint research with our Taiwanese partners. There are three advantages to using a phosphor to make a color LED. First, although color phosphors of different colors such as red, yellow, green, blue, and purple can be prepared without using a phosphor, the luminous efficiencies of these different color LEDs are greatly different. After the phosphor is used, the LEDs of other wavelength bands can be prepared by utilizing the advantages of high luminous efficiency of certain bands of LEDs, so as to improve the luminous efficiency of the band. For example, some green-band LEDs are less efficient. Taiwanese manufacturers use the phosphors we provide to produce a more efficient LED, which is called "apple green" for mobile phone backlights, and has achieved good economic benefits. Secondly, the LED's illuminating wavelength is still difficult to control accurately, which will cause some wavelengths of LEDs to be used without waste. For example, when it is necessary to prepare a 470 nm LED, it is possible to prepare a LED having a wide range from 455 nm to 480 nm, and the LED having an emission wavelength at both ends can be disposed of or discarded at a relatively low price. The use of phosphors can be used to convert these so-called "wastes" into the colors we need. Third, after using phosphors, the color of some LEDs will become softer or brighter to suit different application needs. Of course, the most widely used phosphors on LEDs are still in the white light field, but due to their special advantages, they can also be used in color LEDs. However, the application of phosphors on color LEDs is still in its infancy and needs further research and development.
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