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稀土镨激活的钛酸钙长余辉材料的合成及发光性能
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摘要
稀土离子镨激活的碱土金属钛酸盐是一类化学性能稳定、发光强和色纯度高的红色发光材料,并且其余辉呈慢衰减的特性。本文综述了稀土金属离子镨激活的碱土钛酸盐红色长余辉材料的常用制备方法,介绍了其发光机制及发光性能的影响因素,并采用如下合成方法合成性能良好的长余辉材料。
     以乙醇为溶剂、柠檬酸为螯合剂,采用溶胶-凝胶法合成红色长余辉材料CaTiO_3: Pr~(3+),Al~(3+)。用热重和差热联用仪对干凝胶进行了失重分析,用XRD粉末衍射仪、透射电镜、荧光光度计和屏幕亮度计分别对样品晶形、粒径分布、光谱特性进行了测定。热重分析曲线及X射线衍射分析结果表明溶胶-凝胶法合成的样品在700℃灼烧5个小时可得到晶相较好的钙钛矿型CaTiO_3,激发和发射光谱及余辉衰减曲线显示干凝胶在900℃下灼烧时具有较好的余辉性能,溶胶-凝胶法合成的样品余辉性能明显优于高温固相法合成的余辉材料。溶胶-凝胶法合成余辉材料过程中使用超声分散技术能提高产物余辉性能。
     以钛酸四丁酯、硝酸钙为原料,采用改进的固相法合成了稀土镨掺杂的钛酸钙长余辉材料。用热重和差热联用仪对前驱体进行了失重分析,用XRD粉末衍射仪、透射电镜、分别对样品晶形、粒径等特性进行了测定。目标产物的发光性能表明前驱体在900℃的温度下灼烧时具有较好的性能。
     以尿素为燃料、硼酸为助熔剂,采用燃烧法成功地合成了稀土镨和铝掺杂的钛酸钙红色长余辉材料。研究了尿素、硼酸的用量以及初始炉温对长余辉材料性能的影响。结果表明,在一定范围内尿素的用量对余辉性能影响不明显;而硼酸的加入能显著地提高余辉材料地发光性能,其最合适的加入量为硼酸与硝酸钙摩尔比为0.4;在400到900℃的初始炉温范围内,随着初始炉温的升高其发光性能也相应的增高。
     采用草酸盐沉淀法合成了钛酸钙长余辉材料,所得目标产物颗粒分布均匀,其余辉性能随着后期灼烧温度的升高而增强。
Rare earth praseodymium doped calcium titanate persistent phosphor is chemically and thermally stable complex oxide, which is known for several years as a red emitting phosphor characterized by a single emission peak with chromaticity coordinates, very close to the coordinates of the“ideal red”. In this paper, the preparation methods, luminescence mechanism and influence factors of praseodymium doped calcium titanates were introduced. The various synthesis methods (including sol-gel, modified solid-state, combustion and coprecipitation methods) were employed to prepare the persistent phosphors.
     Red CaTiO_3: Pr~(3+), Al~(3+) persistent phosphors have been synthesized by sol-gel method using ethanol as solvent and citric acid as a chelating agent. TG-DTG curves and X-ray diffraction analysis indicate that crystalline calcium titanate has been synthesized at calcining temperature of 700℃for 5 hours. Photoluminescence and decay curves indicate that the luminescence properties of phosphors synthesized by sol-gel method are better than that prepared by solid-state reaction and the sample heated at 900℃exhibits the optimal luminous property. Using ultrasonic dispersing technique improved the luminescence properties of phosphors.
     Using tetra-n-butyl titanate and calcium nitrate as raw materials, the praseodymium-doped calcium titanates have been synthesized via a modified solid-state reaction. The decomposition process of the precursor, crystallization, and particle sizes of CaTiO_3: Pr~(3+) have been investigated by using thermal analysis, powder X-ray diffraction and transmission electron microscopy. TG-DTG curves and X-ray diffraction analysis indicate that crystalline calcium titanate has been synthesized at calcining temperature of 600℃for 2 hours. Photoluminescence and decay curves show that the sample obtained at the sintering temperature of 900℃exhibited the optimal luminous property.
     Using urea as fuel and boric acid as flux material, red persistent phosphors CaTiO_3: Pr~(3+),Al~(3+) have been successfully synthesized by combustion method. The process lasted for less than 5 min and led to the formation of voluminous white powder. The photoluminescence, crystallinity and particle morphology of persistent phosphors were investigated by using luminescence spectrometer, X-ray diffractometer (XRD) and transmission electron microscopy (TEM), respectively. The results showed that the boric acid was effective in improving the photoluminescence intensity of CaTiO_3: Pr~(3+), Al~(3+) phosphor particles and the optimum molar ratio of boric acid to calcium nitrate was about 0.4. The luminescent properties and crystallinity of phosphors increased with increasing initiating temperature.
     Using tetra-n-butyl titanate, calcium nitrate and oxalic acid as raw materials, the praseodymium-doped calcium titanates have been synthesized via calcinations of oxalate coprecipitated precursors. The decomposition process of the precursor, crystallization, and particle sizes of praseodymium-doped calcium titianates have been investigated by using thermal analysis, powder X-ray diffraction and transmission electron microscopy, respectively. Photoluminescence of the sample obtained at 900℃was examined by luminescence spectrometer, and the brightness of persistent phosphors indicate that the luminous property of the samples was enhanced with increasing sintering temperature.
引文
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