Aluminosilicate blue fluorescent powder and preparation thereof

Abstract

The invention relates to aluminosilicate blue phosphor powder and a preparation method thereof, and belongs to the technical field of luminescent material. The chemical formula of the aluminosilicate blue phosphor powder is Ba1-xAl2Si2O8:xEu<2+>, wherein x is more than 0 and less than 0.2. The preparation method comprises the following concrete steps: weighing barium salt, aluminum salt, silicic acid and europium oxide according to metering ratio of the elements in the chemical formula and proper amount of surfactant and fusing assistant; preparing a precipitating agent solution; dissolving the europium oxide by concentrated acid, and adding proper amount of deionized water to carry out water bath treatment; adding the barium salt, the aluminum salt and the surfactant, stirring the mixture, adding the precipitating agent solution into the mixture by multiple times, adjusting pH to more then or equal to 7, and continuously stirring the mixture for 0.5 to 4 hours; keeping standing or carrying out centrifugal precipitation, filtering, washing and drying the mixture to obtain a precursor; and after mixing the precursor and the fusing assistant evenly, placing the precursor and the fusing assistant into a muffle furnace protected by reducing atmosphere to calcine, so as to obtain the required phosphor powder. The preparation method adopts a one-time calcining technology and finishes doping at the same time of thermal decomposition of the precursor; and the prepared phosphor powder has the advantages of high luminous intensity and good stability and color rendering property, and is suitable to be used as near ultraviolet radiated blue phosphor powder of an LED excited by an InGaN tube core.

Description

1. Technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to an aluminosilicate blue fluorescent powder and a preparation method thereof. 2. Background technology [0002] In the context of rising global energy prices and global warming, energy conservation and environmental protection are more important than ever before. Global energy conservation goals and environmental protection standards that are oriented or enforced by national policies are more clear and consistent than in the past. urgent. In 2007, Australia first announced the phase-out of incandescent lamps before 2012, and the European Union successively announced that they would no longer sell incandescent lamps in 2009. Then Canada, Japan, and California in the United States have corresponding plans to promote energy-saving lamps to replace incandescent lamps or a timetable for restricting their use. . In recent years, the Chinese government has ...

AI Technical Summary

Problems solved by technology

However, there are few existing phosphors suitable for near-ultraviolet LEDs, and most of them are synthesized by high-temperature solid-state reaction, combustion and spray pyrolysis.

Patents for high-temperature solid-state reaction methods such as CN1844303A, CN101126024A, and CN101230271A have the advantages of simple process and low cost for preparing phosphors. Surface damage, which greatly reduces the performance of the phosphor

Patents on the combustion method such as CN101280189A and CN1730606A, the fluorescent powder prepared by this method has the advantages of narrow particle size distribution, low synthesis temperature, energy saving and time saving, etc., but the purity is low, the luminescence performance is poor, and a large amount of gas is released during the preparation process, which is not conducive to environmental protection

The patent of spray pyrolysis method, such as CN101050362A, has the advantages of uniform particle size distribution, high crystallinity, easy operation, and high production efficiency of phosphor powder prepared by this method, but cavities are easy to appear in the prepared phosphor particles, and collapse is easy to occur after high-temperature roasting , Broken, affecting the use effect

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