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Research on the Preparation, and Process Optimization of BaMgAl10O17:Eu2+ Blue Phosphor

Author: LiuHaiLin
Tutor: LiZhiGuang
School: Hunan Agricultural University
Course: Applied Chemistry
Keywords: Blue phosphor BaMgAl10O17: Eu2 High-temperature solid- state reaction Luminescent properties Preparation
CLC: O482.31
Type: Master's thesis
Year: 2011
Downloads: 16
Quote: 0
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Abstract


In the ultraviolet (UV) and vacuum ultraviolet (VUV) excitation of BaMgAl10O17: Eu2 (BAM) its good high quantum efficiency and color purity, has become mercury-free fluorescent lamps, trichromatic fluorescent lights, plasma flat panel display (PDP) and other lighting and display equipment preferred blue phosphor. Currently, the high-temperature solid-phase method is the most commonly used method of BAM blue phosphor was prepared, but synthesized using this method, the BAM blue phosphor is in the process of using the prevalence of two problems: First, the synthesis temperature is high, large energy consumption , and the product is easy to sintering; second is the high temperature performance is easily deteriorated. Therefore, the development of the new process of the BAM phosphor was prepared, for reducing the production costs and increase the luminous efficiency of the BAM phosphor, has important significance. Pursuant to this request, we will be mainly by improving the preparation process parameters to improve test performance of BAM blue phosphor (performance). This paper is the flux of high temperature solid-phase synthesis of BAM blue powder process, sintered at high temperature and high temperature reduction process parameters to optimize the design, and the use of X-ray diffraction (XRD), scanning electron microscopy (SEM), particle size analyzer and fluorescence spectrometer were obtained under different conditions phosphor-phase structure, particle morphology and spectral characteristics were characterized. To analyze the principle of the high temperature reaction flux AlF3 obtained in the process of preparing BAM blue powder appropriate to add the total mass of 3% AlF3 flux can effectively contribute to the high-temperature synthesis reaction proceeds, and other flux phase. the ratio, AlF3-synthetic product was higher purity better crystallinity. In addition, the paper also analyzes the main mechanism BAM matrix formation, determined on the basis of the sintering process temperature program. Realized by the transformation of the reduction furnace, the fluidized state of the powder in a reducing atmosphere, increasing the contact area, and reduce the reduction temperature solid - gas reaction. Finally, good starting light blue phosphor prepared under optimum conditions derived, and preparation of samples for performance testing results show that the new samples prepared phosphors good crystallinity, relative brightness than the use of goods blue powder was slightly lower, but after heat treatment, a 40% reduction in commercial phosphor its brightness, and experimentally obtained phosphor its brightness is reduced by less than 20%, center particle diameter is located 0.6um, good dispersibility, in line with the blue phosphor coated screen requirements.

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CLC: > Mathematical sciences and chemical > Physics > Solid State Physics > Solid nature of the > Optical Properties > Luminescence
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