Modification of NaYF4:Yb,Er@SiO2 Nanoparticles with Gold Nanocrystals for Tunable Green-to-Red Upconversion Emissions
Modification of NaYF4:Yb,Er@SiO2 Nanoparticles with Gold Nanocrystals for Tunable Green-to-Red Upconversion Emissions
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DOI：
10.1021/jp110603r
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发表时间：
2011-03-03
影响因子：
3.7
通讯作者：
Xiong, Yujie
中科院分区：
文献类型：
--
作者：
Li, Zhengquan;Wang, Limin;Xiong, Yujie
稀土元素掺杂的上转换纳米晶体可以将近红外光转换为可见光，因其在生物医学工程中的巨大潜力而引起了人们越来越大的兴趣。然而，操纵不同发射线之间的强度比并实现可调谐上转换功能仍然是一个巨大的挑战。在此，我们提出了一种将NaYF 4：Yb，Er上转换纳米晶与金纳米晶结合的简单方法来构建NaYF 4：Yb，Er@SiO2@Au杂化纳米结构，其中在NaYF 4：Yb，Er纳米晶上的二氧化硅层作为金修饰的界面。上转换纳米晶体的绿光到红光发射可以通过改变周围金纳米晶体的量来方便地调节。我们进一步证明了利用绿色和红色发射线的自发信号在发射体-猝灭剂为基础的生物测定，通过实施这种新的混合纳米结构的能力。可以预期，在这种混合纳米结构中的上转换荧光的可控性可以提供一个平台，用于广泛探索在生物成像，检测和传感中的应用。
Lanthanide-doped upconversion nanocrystals which can convert near-infrared lights to visible lights have attracted growing interest because of their great potentials in biomedical engineering. However, it remains a grand challenge to maneuver the intensity ratio between different emission lines and enable tunable upconversion functions. Herein, we present a facile method to integrate NaYF4:Yb, Er upconversion nanocrystals with gold nanocrystals for constructing NaYF4:Yb,Er@SiO2@Au hybrid nanostructures, in which a silica layer on NaYF4:Yb,Er nanocrystals serves as an interface for gold decoration. The green-to-red emissions of the upconversion nanocrystals can be conveniently tuned by altering the amount of surrounding gold nanocrystals. We further demonstrate the capability of utilizing both green and red emission lines for spontaneous signaling in an emitter-quencher-based bioassay by implementing this novel hybrid nanostructure. It is anticipated that the controllability in upconversion fluorescence in this hybrid nanostructure may provide a platform for widely exploring applications in biological imaging, detection, and sensing.