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Ligand-assisted fabrication, structure, and luminescence properties of FerZnSe quantum dots

机译：配体辅助的FerZnSe量子点的制备，结构和发光性能

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Here, we report a synthetic route for highly emissive Fe:ZnSe quantum dots in aqueous media using the mercaptoacetic acid ligand as stabilizing agent. The structural, morphological, componential, and optical properties of the resulting quantum dots were explored by the X-ray diffraction, transmission electron microscopy, energy-dispersive X-ray spectroscopy, inductively coupled plasma mass spectrom-etry, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, photoluminescence and UV-visible absorption spectroscopies. The average crystallite size was calculated to be about ca., 4.0 nm using the Scherrer equation, which correlates well with the value obtained from the transmission electron microscopy analysis. The obtained water-soluble Fe:ZnSe quantum dots in the so-called "quantum confinement regime" are spherical shaped, possess the cubic sphalerite crystal structure, and exhibit tunable luminescence properties. The presence of mercaptoacetic acid on the surface of Fe:ZnSe quantum dots was confirmed by the Fourier transform infrared spectroscopy measurements. As the ligand/Zn molar ratio increases from 1.3 to 2.8, there is little shift in the absorption peak of the FerZnSe sample, indicating that the particle size of the obtained quantum dots is not changed during the synthetic process. The photoluminescence quantum yield of the as-prepared water-soluble Fe:ZnSe quantum dots can be up to 39%. The molar ratio of ligand-to-Zn plays a crucial role in determining the final luminescence properties of the resulting quantum dots, and the maximum PL intensity appears as the ligand-to-Zn molar ratio is 2.2. In addition, the underlying mechanism for the resulting tunable luminescence properties of the obtained Fe:ZnSe quantum dots was also elucidated.
机译：在这里，我们报告了使用巯基乙酸配体作为稳定剂的水性介质中高发射Fe：ZnSe量子点的合成路线。通过X射线衍射，透射电子显微镜，能量色散X射线光谱，电感耦合等离子体质谱，X射线光电子能谱，探索了所得量子点的结构，形态，组成和光学性质。傅里叶变换红外光谱，光致发光和紫外可见吸收光谱。使用Scherrer方程计算出平均微晶尺寸为约4.0nm，该微晶尺寸与从透射电子显微镜分析获得的值很好地相关。在所谓的“量子限制区”中获得的水溶性Fe：ZnSe量子点是球形的，具有立方闪锌矿晶体结构，并且显示出可调的发光性质。 Fe：ZnSe量子点表面上巯基乙酸的存在通过傅里叶变换红外光谱法测量得到证实。当配体/锌的摩尔比从1.3增加到2.8时，FerZnSe样品的吸收峰几乎没有变化，表明在合成过程中获得的量子点的粒径没有变化。所制备的水溶性Fe：ZnSe量子点的光致发光量子产率可高达39％。配体与锌的摩尔比在确定最终量子点的最终发光性能中起着至关重要的作用，并且当配体与锌的摩尔比为2.2时，最大PL强度出现。此外，还阐明了获得的Fe：ZnSe量子点的可调谐发光特性的潜在机理。

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