通过工程设计高转换选择性的高效定制 在Na中兰化物的局部结构{x}REF{3+x) 纳米晶体
Hao Dong1, Ling-Dong Sun1, Ye-Fu Wang1
1†Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
研究人员通过调整组合,在纳米晶体中设计了兰化物局部结构. 这种方法精确地控制了高级光学应用 (如生物成像和显示器) 的上转换排放.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 光子学是指光子学的使用方法.
背景情况:
- 为光学应用而定制化纳米晶体的升级转换排放对于光学应用至关重要.
- 控制兰化物局部结构提供了调整这些排放的途径.
研究的目的:
- 开发一种简单的方法,用于在Na(x) REF(3+x) 纳米晶体中设计兰化物局部结构.
- 调查局部结构修改对上转换排放选择性的影响.
主要方法:
- 合成的Na(x) REF(3+x) 纳米晶体具有不同的[Na]/[RE]和[F]/[RE]比率.
- 分析了格子参数,协调数和局部对称性的变化.
- 测量了不同成分的升级转换排放比率 (红色到绿色).
主要成果:
- 组合调整显著改变了兰他尼德的局部结构.
- 观察到红色到绿色的排放比率的显著变化Na{x}YF{3+x}:Yb,Er (1.9到71) 和Na{x}GdF{3+x}:Yb,Er (1.6到116).
- 在Na(x) YF(3+x):Yb,Tm和9倍的增强Er(3+) 排放中证明了局部结构依赖的上转换选择性.
结论:
- 局部结构工程提供了一种通用方法来量身定制兰化物上转化排放.
- 状CaF2的生长进一步增强了450倍的红色发射,显示了 in vivo生物成像的潜力.
- 这些发现有利于多色显示器,成像和光学应用.
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