柠檬酸螯合法制备BaHfO_3:Ce~(3+)纳米材料及其发光特性
Preparation and Luminescence Characteristics of Nano BaHfO_3:Ce~(3+) Powders Prepared by Citric Acid Chelating Process
查看参考文献15篇
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文摘
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通过柠檬酸螯合法合成BaHfO_3:Ce~(3+)纳米粉体.采用TG-DTA、XRD、SEM等手段对粉体进行了表征,用荧光光度仪分析样品的激发光谱和发射光谱.结果表明:在CA:EG=1:3的条件下得到干凝胶前驱体,经1050 ℃煅烧2 h,合成出结晶度高、近似球形、粒径尺寸约为40 nm的BaHfO_3:Ce~(3+)纳米粉体.Ce~(3+)掺杂浓度为0.9 mol%的BaHfO_3:Ce~(3+)样品激发光谱和发射光谱的相对强度最大.激发光谱有两个较宽的谱带,发光峰值分别在393和445 nm波长处最大.样品在393和445 nm的发射光谱都是由两个发光带组成,在530和590 nm波长处存在最大峰值,对应掺杂Ce~(3+)的5d→~2F_(5/2)和5d→~2F_(7/2)发光跃迁.然而这两条发射光谱有明显不同,这是因为Ce3+离子的4f基态由两个能量差约为2000 cm~(-1)的能级组成. |
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其他语种文摘
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Citric acid chelating method was used to prepare Ce~(3+) doped BaHfO_3 nano-powder. TG-DTA,XRD and SEM were employed to characterize the powder. The excitation and emission spectra of the specimens were analyzed by the fluorescence photometer. Results show that BaHfO_3:Ce~(3+) nanometer powder with high degree of crystallinity,nearly spherical morphology and 40 nm particle size could be synthesized after the precursor gel prepared under the condition of CA:EG=1:3 was calcined at 1050 ℃ for 2 h. The maximum relative intensities of the excitation spectra and emission spectra appeared for the BaHfO_3:Ce~(3+) specimen with Ce~(3+) doped concentration of 0.9 mol%. The excitation spectrum has two relatively wide spectrum bands where there are maximum peak values at the wavelength of 393 nm and 445 nm,respectively. The emission spectra at λ_(ex)= 393 nm and λ_(ex)=445 nm also have two spectrum bands where exist maximum peak values at 530 nm and 590 nm,respectively,corresponding to 5d→~2F_(5/2) and 5d→~2F_(7/2) transitions of Ce~(3+) cation,respectively. The emission spectra at 393 nm and 445 nm are obviously different,because the 4f ground State of Ce~(3+) cation is formed by two energy levels,with the energy difference of about 2000 cm~(-1). |
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来源
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稀有金属材料与工程
,2009,38(8):1446-1449 【核心库】
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关键词
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闪烁陶瓷
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柠檬酸
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sol-gel法
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BaHfO3
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Ce3+纳米粉体
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发光特性
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地址
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1.
沈阳化工学院, 辽宁, 沈阳, 110142
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中国科学院金属研究所, 辽宁, 沈阳, 110016
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沈阳大学, 辽宁, 沈阳, 110044
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1002-185X |
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学科
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一般工业技术;化学工业 |
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基金
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辽宁省自然科学基金
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辽宁省科技攻关项目
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文献收藏号
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CSCD:3718638
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