Regulating the color output and simultaneously enhancing the intensity of upconversion nanoparticles via a dye sensitization strategy
Regulating the color output and simultaneously enhancing the intensity of upconversion nanoparticles via a dye sensitization strategy
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通过染料敏化策略调节颜色输出并同时增强上转换纳米颗粒的强度
DOI：
10.1039/c9tc02293g
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发表时间：
2019
影响因子：
6.4
通讯作者：
Kong Xianggui
中科院分区：
文献类型：
--
作者：
Xue Bin;Wang Dan;Zhang Youlin;Zuo Jing;Chang Yulei;Tu Langping;Liu Xiaomin;Yuan Zhen;Zhao Huiying;Song Jun;Qu Junle;Kong Xianggui
颜色调制的上转换纳米粒子（UCNPs）由于其上级特性而获得了广泛的光学应用，包括低的自发荧光背景噪声、大的反斯托克斯位移和可区分的尖锐发射带。最近在UCNPs的构象改变方面的成功主要依赖于激活剂和其他元素之间的交叉弛豫，这使得它们能够在光学编码和生物成像中表现出色。然而，颜色调制受到交叉弛豫策略的影响，这严重削弱了激活剂的原始发射强度。在这里，我们报告了一种染料敏化策略，共轭强近红外吸收染料的表面上的UCNPs。结果表明，染料敏化可以改变NaYF 4：Yb/Er@NaYF4：Nd纳米复合材料的红/绿色（R/G）发射比，同时提高其发光强度。R/G发射比可以被调节以增加或减少，受益于染料敏化策略。在808 nm和980 nm的正交激发下证明了防伪应用的概念证明。
Color-modulated upconversion nanoparticles (UCNPs) have garnered widespread optical applications owing to their superior properties, including low auto-fluorescence background noise, large anti-Stokes shift, and distinguishable sharp emission bands. Recent success in multicolor alteration of UCNPs has mostly relied on the cross-relaxation between activators and other elements, which allows them to perform excellently in optical encoding and bioimaging. However, the color modulation is subject to the cross-relaxation strategy, which heavily weakens the original emission intensity of the activators. Herein, we report a dye-sensitization strategy of conjugating strong near-infrared absorptive dyes on the surface of UCNPs. It was proven that dye sensitization can manipulate the red to green (R/G) emission ratio of NaYF4:Yb/Er@NaYF4:Nd UCNPs and simultaneously enhance their luminescence intensity. The R/G emission ratio can be tuned to increase or decrease, benefiting from the dye sensitization strategy. Proof of concept was demonstrated for anti-counterfeiting application under orthogonal excitation of 808 nm and 980 nm.