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Selective enhancement of red emission from upconversion nanoparticles via surface plasmon-coupled emission

机译：通过表面等离子体耦合发射从上转化纳米粒子中选择性提高红色发射

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摘要

Upconversion nanoparticles (UCNPs) can convert low-energy light (e.g. near-infrared, NIR) to high-energy light (e.g. visible). UCNPs such as NaYF4: Yb, Er will generate strong green emission at 540 nm and weak red emission at 650 nm. Considering the "optical window" of cells and tissues (600-900 nm) owing to the lack of efficient endogenous absorbers, red emission (600-700 nm) enhancement is especially important for deep tissue imaging. Therefore, it is of great significance to selectively enhance red emission of UCNPs. Placing UCNPs in proximity to gold nanorods (AuNRs) can enhance the emission of UCNPs. In this paper, we fabricate heteronanostructures composed of UCNPs and AuNRs and precisely control the distance with polyelectrolyte multilayers as spacers to enhance the red emission of UCNPs. Fluorescence spectra of UCNPs enhanced by AuNRs with different thicknesses of polyelectrolyte are measured. The results show that red emission intensity exhibits a strong dependence on the interparticle distance and spectral properties of these nanoparticles. At a optimized distance of 8 nm, the maximal fluorescence enhancement of 10.6-fold for red emission is achieved by tuning the localized surface plasmon resonance (LSPR) wavelength of AuNRs to match with the red emission. The enhancement of the red emission is further confirmed by a decreased decay time induced by surface plasmon-coupled emission (SPCE). The enhancement also contributes to the increased penetration depth from 7.5 mm to 12.5 mm. These results reveal that our strategy possesses the ability of selectively enhancing red emission of UCNPs and provides theoretical guidance on preparing versatile systems with enhanced red emission by the SPCE effect.
机译：上转换纳米颗粒（UCNP）可以将低能量光（例如近红外，NIR）转换为高能光（例如，可见）。 UCNP如Nayf4：Yb，ER将在540nm处产生强大的绿色排放，并在650nm处为红色发射弱。考虑到细胞和组织的“光学窗口”（600-900nm）由于缺乏有效的内源性吸收剂，红色发射（600-700nm）增强对于深组织成像尤为重要。因此，选择性地增强UCNP的红色发射具有重要意义。将UCNP放置在金纳米棒（AUNR）附近（AUNR）可以增强UCNP的发射。在本文中，我们制造由UCNP和AUNR组成的异系结构，并精确地控制与聚电解质多层作为垫片的距离，以增强UCNP的红色发射。测量具有不同厚度聚电解质的AUNR增强的UCNP的荧光光谱。结果表明，红色发光强度表现出对这些纳米颗粒的颗粒间距和光谱性质的强烈依赖性。在8nm的优化距离处，通过调谐AUNR的局部表面等离子体谐振（LSPR）波长与红色发射来实现10.6倍的红色发射的最大荧光增强。通过表面等离子体耦合发射（SPCE）诱导的衰减时间降低的衰减时间来进一步证实红色发射的增强。增强也有助于增加7.5毫米至12.5mm的渗透深度。这些结果表明，我们的策略具有选择性地提高UCNP的红色排放的能力，并提供了通过SPCE效应提高红发射的多功能系统的理论指导。

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  • 来源
    《RSC Advances》 |2015年第94期|共11页
  • 作者

    Feng Ai Ling; Lin Min; Tian Limei; Zhu Hong Yuan; Guo Hui; Singamaneni Srikanth; Duan Zhenfeng; Lu Tian Jian; Xu Feng;

  • 作者单位

    Xi An Jiao Tong Univ Sch Life Sci &

    Technol MOE Key Lab Biomed Informat Engn Xian 710049 Peoples R China;

    Xi An Jiao Tong Univ Sch Life Sci &

    Technol MOE Key Lab Biomed Informat Engn Xian 710049 Peoples R China;

    Washington Univ Inst Mat Sci &

    Engn Dept Mech Engn &

    Mat Sci St Louis MO 63130 USA;

    Xi An Jiao Tong Univ Sch Life Sci &

    Technol MOE Key Lab Biomed Informat Engn Xian 710049 Peoples R China;

    Xi An Jiao Tong Univ Sch Life Sci &

    Technol MOE Key Lab Biomed Informat Engn Xian 710049 Peoples R China;

    Harvard Univ Sch Med Massachusetts Gen Hosp Ctr Sarcoma &

    Connect Tissue Oncol Boston MA 02114 USA;

    Harvard Univ Sch Med Massachusetts Gen Hosp Ctr Sarcoma &

    Connect Tissue Oncol Boston MA 02114 USA;

    Xi An Jiao Tong Univ Sch Life Sci &

    Technol MOE Key Lab Biomed Informat Engn Xian 710049 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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