Spectral and spatial characterization of upconversion luminescent nanocrystals as nanowaveguides.
Spectral and spatial characterization of upconversion luminescent nanocrystals as nanowaveguides.
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DOI：
10.1039/c7nr01745f
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发表时间：
2017-07
期刊：
影响因子：
6.7
通讯作者：
Wen Xu;T. Lee;Byeong-Seok Moon;Donglei Zhou;Hongwei Song;Young‐Jin Kim;S. Kwak;Peng Chen;Dong-Hwan Kim
中科院分区：
文献类型：
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作者：
Wen Xu;T. Lee;Byeong-Seok Moon;Donglei Zhou;Hongwei Song;Young‐Jin Kim;S. Kwak;Peng Chen;Dong-Hwan Kim
上转换(UC)发光纳米晶在近红外(NIR)激发下，在覆盖紫外区到近红外区的宽光谱带宽上表现出独特的多波段发射，这对于利用波分复用来实现高传输速率的多通道光通信至关重要。在本研究中，我们从实验和理论上研究了单一的NaYF_4：Yb~(3+)，Tm~(3+)(Yb~(3+)，Er~(3+))UC纳米晶作为纳米波导体的光谱和空间特性。我们认为，UC纳米晶体可以用作纳米波导体，因为它同时产生一系列输出颜色，并在传播过程中提供不变的发射带。通过对NaYF_4：Yb~(3+)，Tm~(3+)(Yb~(3+)，Er~(3+))单一UC纳米晶的观察，首次发现单个UC纳米晶具有波长和位置相关的UC发射。此外，通过在UC纳米晶体中添加Ag涂层作为等离子体波导管，并引入光子晶体，UC发射的散射损耗在NaYF4纳米晶体的中间被显著抑制，表明光通过UC纳米晶体是有效的。我们的发现提供了在单纳米粒子水平上使用UC纳米晶体作为纳米导波的基本理解，扩展了我们对UC纳米材料性能优化的知识。
Lanthanide upconversion (UC) luminescent nanocrystals exhibit a uniquely sharp multiband emission over a broad spectral bandwidth covering the ultraviolet region to the near-infrared (NIR) region when subjected to NIR excitation, which is vital for multichannel optical communication using wavelength-division multiplexing to achieve high transmission rates. In this study, we experimentally and theoretically investigated the spectral and spatial characterization of a single NaYF4:Yb3+,Tm3+(Yb3+,Er3+) UC nanocrystal as a nanowaveguide. We suggest that a UC nanocrystal can be used as a nanowaveguide because it produces a range of output colors simultaneously and provides unaltered emission bands during propagation. Via the observation of single NaYF4:Yb3+,Tm3+(Yb3+,Er3+) UC nanocrystals, we found, for the first time, that a single UC nanocrystal exhibited wavelength- and position-dependent UC emissions. In addition, by adding Ag coating to the UC nanocrystal to act as a plasmonic waveguide and introducing a photonic crystal, the scattering loss of the UC emissions was significantly suppressed in the middle of the NaYF4 nanocrystal, indicating efficient light guiding through the UC nanocrystal. Our discovery provides a basic understanding of the use of UC nanocrystals as nanowaveguides at the single-nanoparticle level, expanding our knowledge of the performance optimization of UC nanomaterials.