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Global Development of rare earth phosphors materials

浏览次数:538 日期:2011-10-14

CRT (cathode ray) light-emitting phosphors are rare earth materials in the first application, the popularity of TV and the PC boom of new materials to make this classic high-speed growth, there are still 7% annual growth, but also facing flat show challenges. Color TV and color monitor with phosphor technology basically formed in the 1970s, the U.S. RCA is the originator of this technology, but the Japanese company Nichia ﹑ Kassei in this area such as continuous infusion of new technology content, the screen's brightness, contrast , clarity, sunlight readability, and other indicators of life has improved greatly. Japanese companies a virtual monopoly on the CRT phosphor technology, they use industry standards and technology makers.

Lamp phosphor. First synthesized in 1974, Philips, green powder of rare earth (Ce, Tb) MgAl11O19, blue powder (Ba, Mg, Eu) 3Al16O27 and Pink Y2O3: Eu, by mixing them, made a three-color phosphor. As the rare earth tricolor phosphor luminescence properties and excellent energy-saving features make the application more widely, the United States, Korea and other countries have legislation to promote energy-saving lamps used in recent years, the market growth remained at 15 ~ 20% level. Lamp phosphor technology, a high level of Nichia Chemical ﹑ companies such as GE and Tokyo.

Plasma display panel (PDP) with a phosphor. Among the flat panel display technology, PDP is the big screen (30 to 50 inches) of choice, is the only flat-panel display technology to achieve commercialization. With the increase in the rate of qualified products, the price in 3 to 5 million yen (40 to 42 inches), annual sales growth of 50%. PDP manufacturing the world's few manufacturers, mainly Japanese Fujitsu ﹑ ﹑ Mitsubishi NEC Panasonic ﹑ ﹑ ﹑ Pioneer Hitachi, U.S. Photonic Image ﹑ Plasmaco ﹑ Rogers, South Korea's Samsung, the French Thomson, the Netherlands, Philips . PDP manufacturing technology base for the Japanese monopoly, with a phosphor slurry technology from DuPont monopoly.

Long afterglow phosphor. In recent years, rapid development of long afterglow phosphor, in addition to emerging new phosphor, the phosphor as the theory and development of manufacturing technology, many traditional phosphors has been given a new application features. Meanwhile, the application market continues to expand, also contributed to research in this area is very active.

Light conversion material. Light conversion material is absorbed sunlight on plant growth detrimental to the UV, and then converted to visible light, enabling the production of plants, mainly 400 ~ 480nm of blue light 600 ~ 680nm red light, thus contributing to crop photosynthesis, reaching as The purpose of early production. Common are the rare earth organic complexes of rare earth light conversion agent and inorganic light-emitting materials, conversion agent, such as the TTA-TOPO: Eu3 +, 364nm UV excitation of red, rare earth (Eu, Tb) chelate light conversion agent; CaS : Eu, Cl, CaS: Cu, Eu.

Electroluminescent (EL) phosphor. EL is the energy directly into light energy, which is characterized by low voltage, high energy conversion efficiency, small size, light weight, wide working range, fast response, solid-based devices do fulfill. Rare-earth doped ZnS, CaS and SrS thin film electroluminescent display devices in the plane cut a striking figure.

Field emission display (FED) phosphors. FED is likely to compete with PDP and LCD flat panel display, its picture quality and resolution is better than CRT, fast response (≤ 20μs), the LCD power consumption is only 1 / 3 the thickness of the flat panel display LCD and weighs only 1 / 2, and its application prospects attention.

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