定制单个NaYF4:Yb(3+)/Er(3+)纳米晶体中的等离子体增强上转换
Tailoring Plasmonic Enhanced Upconversion in Single NaYF4:Yb(3+)/Er(3+) Nanocrystals.
作者信息
Wang Ya-Lan, Mohammadi Estakhri Nasim, Johnson Amber, Li Hai-Yang, Xu Li-Xiang, Zhang Zhenyu, Alù Andrea, Wang Qu-Quan, Shih Chih-Kang Ken
机构信息
1] Department of Physics, The University of Texas at Austin, Austin, TX 78712, USA [2] Department of Physics, Wuhan University, Wuhan 430072, P. R. China.
Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX 78712, USA.
出版信息
Sci Rep. 2015 May 15;5:10196. doi: 10.1038/srep10196.
By using silver nanoplatelets with a widely tunable localized surface plasmon resonance (LSPR), and their corresponding local field enhancement, here we show large manipulation of plasmonic enhanced upconversion in NaYF4:Yb(3+)/Er(3+) nanocrystals at the single particle level. In particular, we show that when the plasmonic resonance of silver nanolplatelets is tuned to 656 nm, matching the emission wavelength, an upconversion enhancement factor ~5 is obtained. However, when the plasmonic resonance is tuned to 980 nm, matching the nanocrystal absorption wavelength, we achieve an enhancement factor of ~22 folds. The precise geometric arrangement between fluorescent nanoparticles and silver nanoplatelets allows us to make, for the first time, a comparative analysis between experimental results and numerical simulations, yielding a quantitative agreement at the single particle level. Such a comparison lays the foundations for a rational design of hybrid metal-fluorescent nanocrystals to harness the upconversion enhancement for biosensing and light harvesting applications.
通过使用具有广泛可调谐局域表面等离子体共振（LSPR）的银纳米片及其相应的局域场增强，我们在此展示了在单粒子水平上对NaYF4:Yb(3+)/Er(3+)纳米晶体中基于等离子体增强的上转换的大幅调控。特别地，我们表明，当银纳米片的等离子体共振调谐至656 nm，与发射波长匹配时，可获得约5倍的上转换增强因子。然而，当等离子体共振调谐至980 nm，与纳米晶体吸收波长匹配时，我们实现了约22倍的增强因子。荧光纳米颗粒与银纳米片之间精确的几何排列使我们首次能够对实验结果与数值模拟进行对比分析，在单粒子水平上达成定量一致。这样的比较为合理设计混合金属 - 荧光纳米晶体奠定了基础，以利用上转换增强用于生物传感及光捕获应用。
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