无异型LaPO4:Eu纳米晶体的极化发光
Elodie Chaudan1, Jongwook Kim1, Sandrine Tusseau-Nenez1
1Laboratoire de Physique de la Matière Condensée , Ecole Polytechnique, CNRS, Université Paris-Saclay , 91128 Palaiseau , France.
Journal of the American Chemical Society
|July 5, 2018
概括
欧酸纳米晶体在相位过渡过程中显示出明显的发光偏振变化. 这种光谱方法提供了一种高度灵敏的方法来检测纳米材料的结构变化.
科学领域:
- 材料科学
- 光谱学
- 纳米技术
背景情况:
- 兰化物元素具有独特的光谱性质,对的应用有价值.
- 化离子的发光极化可以揭示宿主物质的晶相,对称性和缺陷.
- 这种极化特征在化纳米研究中未得到充分探索.
研究的目的:
- 在酸 (LaPO4) 纳米晶体中的相变过程中研究欧离子 (Eu3+) 光的演变.
- 探索发光极化作为描述纳米材料相位过渡的敏感工具的潜力.
主要方法:
- 使用LaPO4的c轴对齐的纳米晶体组件.
- 在热诱导相变过程中分析了Eu3+的辐射偏振.
- 将发光光谱的灵敏度与X射线衍射进行结构分析.
主要成果:
- 在LaPO4多态体中观察到相当于不同位点对称性的Eu3+排放偏振的显著变化.
- 证明光发极化变化准确地反映了纳米晶体的结构修改.
- 与X射线衍射相比,这种光谱方法在检测结构变化方面具有更高的灵敏度.
结论:
- Eu3+的发光极化作为LaPO4纳米晶体相变和结构变化的敏感指标.
- 这种方法为研究纳米材料的相变提供了一种新,高度敏感的方法.
- 兰化物发射器可以作为生物成像和微流体应用的定向感应纳米探针.
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