共查询到17条相似文献,搜索用时 109 毫秒
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研究了SrAl2O4:Eu^2 ,Dy^3 长余辉材料的一种新合成方法。首先利用水热法制备出该发光材料的前驱体,然后将此前驱体粉体在还原气氛下高温烧结,得亮度高,余辉时间长的洲SrAl2O4:Eu^2 ,Dy^3 超细长余辉材料,并对其发光性能进行了研究。并对水热法和复合沉淀法合成的此种材料进行了比较。 相似文献
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凝胶法制备稀土掺杂的超细SrAl2O4基发光材料及其性能研究 总被引:3,自引:0,他引:3
利用凝胶法首次合成出了亮度高,余辉时间长,粒径约20-80nm的SrAl2O4:Eu,Dy超细光致发光粉体,并对其发光性能与高温固相反应法制得的试样进行了比较。结果发现,其发射光谱和激发光谱的主峰位置较之固相法产品均出现了明显的蓝移(λex:320nm→304nm,360nm→323nm,λem:520nm→500nm)。余辉衰减曲线表明,该法合成的发光粉体,其余辉衰减速度相对固相法合成的发光粉体要快,并且也存在快速衰减和慢衰减两个过程。并认为蓝移现象以及余辉衰减变快,主要归因于发光粉体纳米粒子的量子尺寸效应的影响。 相似文献
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燃烧法合成长余辉发光材料SrAl2O4:Eu2+,Dy3+的研究 总被引:1,自引:0,他引:1
以尿素和硝酸盐溶液为反应介质,在600℃下用燃烧法一次制备出了Eu^2 ,Dy^3 掺杂的铝酸锶(SrAl2O4)磷光体。用SEM、XRD研究了所得磷光材料的形态、粒度和物相组成,用荧光分光光度计测定了磷光材料的发光性能。结果表明SrAl2O4:Eu^2 ,Dy^3 磷光材料的晶体结构属于单斜晶系结构。制备产物的形貌呈疏松多孔状,晶粒形状为针状,长度有200nm左右,直径在80nm以下。制备产物在520nm处有很强的发射峰,它的激发光谱是激发峰峰值290nm的宽带激发。并探讨了该材料发光性能的影响因素。 相似文献
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采用环己烷/ Triton X-100 /正辛醇/水的微乳体系,合成了均一纳米级的铝酸锶长余辉材料的前驱物,并在1200℃煅烧后得到了具有长余辉发光性质的SrAl2O4:Eu,Dy纳米材料.经过X衍射分析可以知道SrAl2O4:Eu,Dy的晶形结构为单斜晶系,透射电镜表征结果显示,1200℃煅烧后晶格直径为40~60nm的杆状物.荧光光度法测定长余辉发光材料SrAl2O4:Eu,Dy的发射光谱的峰值波长为510nm,激发光谱的峰值波长为310nm,相对于固相法的产品,发射和激发光谱均发生了蓝移.最后讨论了微乳液法中影响产物粒径大小的主要因素,并得出了最佳的合成工艺条件. 相似文献
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通过TG-DSC和XRD分析,对合成SrAl2 O4:Eu,Dy发光材料所用碳酸锶原料形貌及合成过程中的变化特征展开研究.研究结果表明,碳酸锶原料影响SrAl2 O4:Eu,Dy余辉发光性能的主要因素是原料的颗粒粒度和形貌.由于原料微观结构的不同,导致加热到900℃以上发生热分解的过程不同,合成过程中与氧化铝的反应表面面积和活性也不同,从而影响合成过程中锶离子和其他稀土掺杂离子的扩散,导致发光材料的结构和性能的差异.研究的几种碳酸锶原料中,采用平均粒径0.8μm的原料制得的产物发光性能最好. 相似文献
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采用溶胶-凝胶法合成了SrAl2O4:Eu2+,Dy3+纳米长余辉发光材料,利用正交设计法优化了制备工艺.在传统溶胶-凝胶法基础上,添加了硼酸,在950℃生成单一晶相,该法能使SrAl2O4生成温度降低150℃,生成的磷光体发光强度高、余辉时间长,平均晶粒尺寸为25~90nm. 相似文献
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为了探讨SrAl2O4:Eu^2+,Dy^3+磷光体的最佳制备工艺,利用正交设计法对合成条件进行了优化,以初始亮度和余辉时间为指标,考察煅烧温度、尿素与硝酸盐的质量比、硼酸的物质的量分数、镝与铕物质的量比对制备工艺的影响。结果表明:最佳制备工艺是煅烧温度600℃,尿素质量等于硝酸盐质量的2倍,硼酸的物质的量分数为0.08,镝与铕的物质的量比为1.0。 相似文献
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S. B Mishra A. K. Mishra A. S. Luyt N. Revaprasadu K. T. Hillie W. J. vdM Steyn E. Coetsee H. C. Swart 《应用聚合物科学杂志》2010,115(1):579-587
New photoactive composite based on ethyl vinyl acetate (EVA) and SrAl2O4:Eu,Dy or Sr4Al14O25:Eu,Dy were prepared by melt mixing or extrusion methodologies. The phosphorescent behavior and material properties of the polymer‐phosphor composites were studied. The morphology of the polymer and the composites were studied by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive X‐ray spectroscopy (EDS). The SEM shows that the physical and chemical behavior of the matrix and the extrusion conditions were primarily responsible for the surface morphology. TEM and EDS show that the phosphor particles were uniformly dispersed in the EVA matrix. A broad band of ultraviolet (UV)‐excited phosphorescence of SrAl2O4:Eu,Dy and Sr4Al14O25:Eu,Dy phosphors and the respective composites were observed at wavelengths of 516 nm and 490 nm, respectively. The photoluminescence (PL) spectra showed less intense phosphorescence but no shift in the wavelength of the emission peak for all the composites. The Hamburg wheel test was done on all the composites and the PL measurements before and after the test showed almost no change in the intensity of the emission. Thermal studies showed that the presence of the phosphors in the matrix slightly increased the crystallinity of EVA, which leads to higher melting enthalpies. Tensile testing shows very little change in the tensile strength and flexibility of the ethylene vinyl acetate copolymer. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 相似文献
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共沉淀-焙烧法制备球形铝酸锶粉体 总被引:1,自引:0,他引:1
以碳酸氢铵、硫酸铝铵和硝酸锶为原料,采用共沉淀法制备了化学组成为SrCO38226;2Al(OH)38226;7H2O的前体,此前体在较低温度下可合成SrAl2O4粉体。利用红外光谱(FTIR)、扫描电镜(SEM)及能量散射分光光谱(EDS)、X射线衍射(XRD)和热分析(TG-DSC)表征了前体及其热处理产物的特征。结果表明,锶铝物质的量比和pH值对粉体成分和颗粒形貌有显著影响,n(Sr)∶n(Al)=1∶1.6、pH=7.6条件下制备了球形前体,此前体在1 100 ℃于空气气氛中焙烧2 h获得了单分散、球形SrAl2O4粉体,合成温度较传统高温固相法低约400 ℃。 相似文献
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Tingsong Li Qiang Liu Danyang Zhu Penghui Chen Yanqiu Jing Junlin Wu Haohong Chen Dariusz Hreniak Martin Nikl Jiang Li 《Journal of the American Ceramic Society》2023,106(10):5877-5886
(Sr0.97Eu0.01Dy0.02)Al2O4 persistent luminescence (PersL) ceramics were fabricated by solid-state reactive sintering in vacuum combined with hot isostatic pressing (HIP) using H3BO3 as a sintering additive. The phase composition, microstructure, luminescence properties, trap state, and PersL performance of HIP post-treated (Sr0.97Eu0.01Dy0.02)Al2O4 PersL ceramics were discussed. For the (Sr0.97Eu0.01Dy0.02)Al2O4 PersL ceramics after HIP post-treatment, the initial luminescence intensity of the ceramics reached over 6400 mcd/m2 with simulated daylight irradiation of 1000 lx for 5 min, and the persistent emission decay time > 17 h. This is much better than the SrAl2O4:Eu2+,Dy3+ PersL powders and the other luminescent ceramics. In addition, this method is a solid-state reactive sintering method for synthesizing ceramics, which has the advantages of low cost and simple operation, and is suitable for large-scale, high-volume industrial production. 相似文献