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摘要随着稀土功能材料的开发和应用技术的发展，稀土纳米发光材料的研究也成为一个主攻方向。稀土发光材料具有环保节能、色彩显色性能好及长寿命的性能，其应用有利于推动照明显示领域产品的更新换代。稀土掺杂氧化钇（Y2O3）纳米发光材料具有优良的发光性能和发光效率。控制合成荧光粉颗粒的尺寸大小以及调节激发波长来调节发光颜色和发光强度，简化合成过程有效利用自然资源减少污染是目前值得研究的课题。21285
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本文中，我们采用了溶胶凝胶法合成了不同浓度铕、铽（Eu3+/Tb3+）掺杂和不同浓度比铕、铽（Eu3+，Tb3+）共掺氧化钇（Y2O3）纳米颗粒。XRD粉末衍射分析测试结果显示，所有合成颗粒均具有纯立方Y2O3结构。场发射扫描电子显微镜（SEM）显示合成颗粒由不均匀的不规则颗粒组成。光致发光光谱（PL）分析表明Y2O3:Eu3+样品显示出红色强光发射，对应于Eu3+的5D0-7F2能级跃迁，掺杂浓度小于10%时，随着掺杂浓度的增加发光强度逐渐增大。Y2O3:Tb样品显示出绿光发射，对应于Tb3+的5D4→7F5能级跃迁，Tb的最佳掺杂浓度为1%。通过调节激发波长从255nm至272nm，可以有效调节Y2O3:Eu:Tb样品中红光和绿光的发光强度。该颜色可调节的发光粒子预计能够得到广泛应用。
毕业论文关键词：氧化钇；铕离子；铽离子；掺杂；溶胶凝胶法；发光
Abstract
With the rapid development of rare earth functional materials exploitation, research on the rare earth luminescent nano-materials has gained increasing interest. The advance of rare-earth luminescent materials will facilitate the environment protection, energy saving and better color performance, and be helpful to promote the upgrading of products in the lighting display field. Rare earth doped yttrium oxide (Y2O3) nano-structured luminescent materials are characterized with excellent luminous property and luminous efficiency. Especially, the study of rare earth doping luminous materials has been focused on the following aspects, including controlling the size of the fluorescent particle, adjusting the excitation wavelength to tune the light color and luminous intensity, simplifying the synthesis process of effective utilization of natural resources to reduce pollution.
In our work, a series of rare earth doped Y2O3 nanoparticles, Y2O3:Eu3+, Y2O3:Tb, Y2O3:Eu:Tb, have been successfully prepared by sol-gel method. XRD powder diffraction results show that all particles are pure cubic structure of Y2O3. Field emission scanning electron microscope (SEM) shows that the samples consist of irregular-shaped particles with different morphology. Photoluminescence spectra of Y2O3: Eu3+ samples showed a red light emission corresponding to the 5D0-7F2 transition of Eu3+ under 255nm excitation. With doping concentration below 10%, luminous intensity increased gradually with the increase of doping concentration. Photoluminescence spectra of Y2O3: Tb 3+ samples showed a green light emission corresponding to the 5D4-7F5 transition of Tb3+ under 272nm excitation. The optimum Tb doping concentration is 1%. The luminescence color emission and intensity could be effectively tuned by switching the excitation wavelength and co-doping concentration ratio of Eu/Tb ions.
Key words: Yttrium oxide; Eu3+; Tb3+; doping; sol-gel; luminescence
目录
绪论 5
1. 文献综述 6
1.1 稀土氧化钇纳米发光材料 6
1.1.1 稀土掺杂氧化钇结构特征 6
1.1.2 氧化钇发光材料的发光机理和发光特性 6
1.1.3 氧化钇纳米发光材料的研究现状 8
1.1.4 稀土掺杂发光材料合成方法研究进展 11
1.1.5 氧化钇的应用 12
1.2 稀土元素发光特性 12
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