Sensitization of upconverting nanoparticles with a NIR-emissive cyanine dye using a micellar encapsulation approach
Sensitization of upconverting nanoparticles with a NIR-emissive cyanine dye using a micellar encapsulation approach
复制标题
DOI：
10.1088/2050-6120/aafe1f
复制
发表时间：
2019-01
影响因子：
3.2
通讯作者：
Maysoon I Saleh;Ihor D Panas;Florian Frenzel;C. Würth;Bastian Rühle;Y. Slominskii;A. Demchenko;U. Resch‐Genger
中科院分区：
文献类型：
--
作者：
Maysoon I Saleh;Ihor D Panas;Florian Frenzel;C. Würth;Bastian Rühle;Y. Slominskii;A. Demchenko;U. Resch‐Genger
光子上转换纳米材料具有广泛的应用，包括生物传感和深层组织成像。它们通常非常弱和窄的吸收带连同它们的尺寸依赖性发光效率一起限制了它们的应用潜力。这已经通过日益复杂的核-壳颗粒结构来解决，包括用在近红外（NIR）中强烈吸收的有机染料敏化。在这项工作中，我们提出了一种简单的水分散性胶束系统，其特征在于能量从具有高摩尔吸收系数和中等荧光量子产率的新型近红外可激发染料1859 SL转移到油酸酯封端的NaYF 4：20%Yb（III），2%Er（III）上转换纳米颗粒（UCNP）。使用表面活性剂Pluronic F-127和Tween 80形成胶束以产生亲水性染料-UCNP系统。从染料到UCNP的成功能量转移可以通过发射测量来证实，该发射测量揭示了在808 nm激发时发生上转换发射，并且与在808 nm的直接Er（III）激发相比，绿色Er（III）发射增强。
Photon upconversion nanomaterials have a wide range of applications, including biosensing and deep-tissue imaging. Their typically very weak and narrow absorption bands together with their size dependent luminescence efficiency can limit their application potential. This has been addressed by increasingly sophisticated core–shell particle architectures including the sensitization with organic dyes that strongly absorb in the near infrared (NIR). In this work, we present a simple water-dispersible micellar system that features energy transfer from the novel NIR excitable dye, 1859 SL with a high molar absorption coefficient and a moderate fluorescence quantum yield to oleate-capped NaYF4:20%Yb(III), 2%Er(III) upconversion nanoparticles (UCNP) upon 808 nm excitation. The micelles were formed using the surfactants Pluronic F-127 and Tween 80 to produce a hydrophilic dye-UCNP system. Successful energy transfer from the dye to the UCNP could be confirmed by emission measurements that revealed the occurrence of upconversion emission upon excitation at 808 nm and an enhancement of the green Er(III) emission compared to direct Er(III) excitation at 808 nm.