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首页> 美国卫生研究院文献>Nanoscale Research Letters >Near-infrared emitting CdTe0.5Se0.5/Cd0.5Zn0.5S quantum dots: synthesis and bright luminescence
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Near-infrared emitting CdTe0.5Se0.5/Cd0.5Zn0.5S quantum dots: synthesis and bright luminescence

机译：发射近红外光的CdTe0.5Se0.5 / Cd0.5Zn0.5S量子点：合成和明亮的发光

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摘要

We present how CdTe0.5Se0.5 cores can be coated with Cd0.5Zn0.5S shells at relatively low temperature (around 200°C) via facile synthesis using organic ammine ligands. The cores were firstly fabricated via a less toxic procedure using CdO, trioctylphosphine (TOP), Se, Te, and trioctylamine. The cores with small sizes (3.2-3.5 nm) revealed green and yellow photoluminescence (PL) and spherical morphologies. Hydrophobic core/shell CdTe0.5Se0.5/Cd0.5Zn0.5S quantum dots (QDs) with tunable PL between green and near-infrared (a maximum PL peak wavelength of 735 nm) were then created through a facile shell coating procedure using trioctylphosphine selenium with cadmium and zinc acetate. The QDs exhibited high PL efficiencies up to 50% because of the formation of a protective Cd0.5Zn0.5S shell on the CdTe0.5Se0.5 core, even though the PL efficiency of the cores is low (≤1%). Namely, the slow growth process of the shell plays an important role for getting high PL efficiencies. The properties of the QDs are largely determined by the properties of CdTe0.5Se0.5 cores and shells preparation conditions such as reaction temperature and time. The core/shell QDs exhibited a small size diameter. For example, the average diameter of the QDs with a PL peak wavelength of 735 nm is 6.1 nm. Small size and tunable bright PL makes the QDs utilizable as bioprobes because the size of QD-based bioprobes is considered as the major limitation for their broad applications in biological imaging.
机译：我们介绍如何通过使用有机胺配体的简便合成，在相对较低的温度（约200°C）下用Cd0.5Zn0.5S壳包覆CdTe0.5Se0.5核。首先使用CdO，三辛基膦（TOP），Se，Te和三辛基胺通过毒性较低的程序制造核。小尺寸（3.2-3.5 nm）的核显示出绿色和黄色的光致发光（PL）和球形形态。然后，通过使用三辛基膦进行简便的壳包衣程序，在绿色和近红外之间可调PL的疏水核/壳CdTe0.5Se0.5 / Cd0.5Zn0.5S量子点（QD）硒与镉和醋酸锌。由于在CdTe0.5Se0.5磁芯上形成了保护性的Cd0.5Zn0.5S壳层，所以即使在磁芯的PL效率较低（≤1％）的情况下，QD仍能显示高达50％的高PL效率。即，壳的缓慢生长过程对于获得高PL效率起重要作用。量子点的性质很大程度上取决于CdTe0.5Se0.5核和壳制备条件的性质，例如反应温度和时间。核/壳量子点的直径较小。例如，PL峰值波长为735 nm的QD的平均直径为6.1 nm。小尺寸和可调节的明亮PL使得QD可用作生物探针，因为基于QD的生物探针的尺寸被认为是其在生物成像中广泛应用的主要限制。

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