An upconversion nanoparticle with orthogonal emissions using dual NIR excitations for controlled two-way photoswitching.
An upconversion nanoparticle with orthogonal emissions using dual NIR excitations for controlled two-way photoswitching.
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DOI：
10.1002/anie.201408219
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发表时间：
2014-12-22
影响因子：
16.6
通讯作者：
Lee, Ki-Bum
中科院分区：
文献类型：
--
作者：
Lai, Jinping;Zhang, Yixiao;Pasquale, Nicholas;Lee, Ki-Bum
开发具有响应于外部刺激在UV至可见光范围内调节其发射波长的能力的上转换纳米颗粒（UCNPs）可以为高分辨率生物成像、生物条形码和驱动多种重要的光化学反应（例如光开关）中的应用提供更动态的平台。在这篇文章中，我们合理地设计了单晶核-壳结构的UCNPs，它们能够响应于808和980 nm处的两种不同的NIR激发而产生正交的UV和可见光发射。这种UCNPs的正交激发-发射特性以及它们利用低功率激发的能力（其衰减来自激光的任何局部加热）赋予了UCNPs在材料和生物环境中应用的巨大潜力。作为概念的证明，已经证明了使用该UCNP通过使用双波长的NIR照射来有效调节螺吡喃的双向光开关。
Developing multicolor upconversion nanoparticles (UCNPs) with the capability of regulating their emission wavelengths in the UV to visible range in response to external stimuli can offer more dynamic platforms for applications in high resolution bio-imaging, multicolor barcoding and driving multiple important photochemical reactions, such as photoswitching. In this communication, we have rationally designed single crystal core-shell structured UCNPs which are capable of orthogonal UV and visible emissions in response to two distinct NIR excitations at 808 and 980 nm. The orthogonal excitation-emission properties of such UCNPs, as well as their ability to utilize low power excitation, which attenuates any local heating from the lasers, endows the UCNPs with great potential for applications in materials and biological settings. As a proof of concept, the use of this UCNP for the efficient regulation of the two-way photoswitching of spiropyran by using dual wavelengths of NIR irradiation has been demonstrated.
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