A kind of aluminate blue fluorescent powder and preparation method thereof

Abstract

The invention provides aluminate blue fluorescent powder and a preparation method thereof. The method comprises the steps that a spraying coprecipitation method is adopted, a solution containing metal ions Ba<2+>, Mg<2+>, Al<3+> and Eu<3+>, a solution containing [C2O4]<2-> and a pH regulator are mixed in water in a spraying mode, and a coprecipitation reaction is performed to obtain an aluminate precursor; after the aluminate precursor is mixed with a fluxing agent, aluminate blue fluorescent powder Ba[1-x]EuxMgAl10O17 is obtained through a high temperature solid phase method, wherein x is larger than 0 and smaller than or equal to 0.35. According to the spraying coprecipitation method, the molar concentration of reactants in the solution is kept consistent relatively, precipitation generation conditions are quite similar, the particle size distribution of the obtained precursor is more concentrated correspondingly, the reduction reaction temperature is low, the heat preservation time is short, and the obtained product is small in particle size, uniform in particle size distribution, high in purity and brightness and good in thermal stability and has few flaws.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to an aluminate blue fluorescent powder and a preparation method thereof. Background technique [0002] With the country's vigorous promotion of energy conservation and environmental protection, the rapid development of the energy-saving lighting industry, the demand for tri-color phosphors has become increasingly strong, so more attention has been paid to the performance requirements of phosphors. Among them, the light decay of the blue phosphor directly affects the service life of the energy-saving lamp, so the improvement of the performance of the blue phosphor is even more important. Aluminate blue phosphor is transparent in the visible light region, and has the characteristics of heat resistance, high temperature resistance, corrosion resistance, stable chemical performance, and high luminous efficiency. It is widely used in low-pressure mercury lamps, copiers, lum...

AI Technical Summary

Problems solved by technology

At present, the preparation of aluminate blue phosphor basically adopts the dry mixing method of two-dimensional or three-dimensional mixing machine, but this method not only has a long cycle, high power consumption, but also uneven mixing, and the reaction during burning and reduction High resistance is not conducive to obtaining purer products; high burning temperature and longer holding time are required during production, phosphor particles are severely sintered, and the particle size is coarse, which requires mechanical ball milling and other processes to reduce the particle size. The ball milling process will destroy the crystallinity of the phosphor particles, resulting in more lattice defects, which will reduce the luminous performance and increase the light attenuation.

[0004] For example, the preparation methods of blue phosphor disclosed in Chinese patent CN85100242, CN1381547A and US patent US5989455 all need to be obtained by reaction under relatively high burning reduction conditions, and there are more Al in the product 2 o 3 and BaAl 2 o 4 and other impurities, and the particle size and distribution of the product are also extremely uneven. It takes a long time for ball milling, resulting in more lattice defects, which seriously affect the luminous brightness and thermal stability of the product.

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