Abstract The optical properties of colloidal quantum dots (QDs), which show unique luminescent properties in comparison with bulk materials, are generally dependent on the size of the core and shell of the QD, but are also significantly affected by ligands attached to the QD's surface. In this study, we investigated not only the effect of ligand substitution on the optical properties of the QD itself but also the QD-light emitting diode (QD-LED) in which the QD was embeded as a light-emitting material. The monodentate amine ligands of InP/ZnS QDs were replaced by bidentate dithiocarbamate (DTC) chelate ligands capable of imparting delocalization property to the surface of InP/ZnS QDs. 1H NMR spectrum showed that the native ligands were partially exchanged with the DTC ligands. Photoluminescence (PL) spectra before and after ligand substitution show a bathochromic shift of about 10–25 nm depending on the electrical resonant properties of the DTC ligands. The QD-LED device was fabricated using QDs replaced by DTC ligands, and some improvements in device properties were observed. Here, we first report the ligand dependence of the photo- and the electroluminescence of InP/ZnS QDs in solution and device.

中文翻译：

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二硫代氨基甲酸酯螯合配体对InP/ZnS量子点及其显示器件光学性能的影响

摘要 胶体量子点 (QD) 的光学性质与块状材料相比显示出独特的发光性质，通常取决于 QD 核和壳的大小，但也受连接到 QD 表面的配体的显着影响。 . 在这项研究中，我们不仅研究了配体取代对 QD 本身光学特性的影响，而且还研究了 QD 作为发光材料嵌入其中的 QD 发光二极管 (QD-LED)。InP/ZnS QDs 的单齿胺配体被双齿二硫代氨基甲酸酯 (DTC) 螯合配体取代，能够赋予 InP/ZnS QDs 表面离域特性。1H NMR 谱表明天然配体与 DTC 配体部分交换。配体取代前后的光致发光 (PL) 光谱显示出约 10-25 nm 的红移，这取决于 DTC 配体的电共振特性。QD-LED 器件是使用由 DTC 配体代替的 QD 制造的，并且观察到器件性能的一些改进。在这里，我们首先报告了溶液和器件中 InP/ZnS QD 的光致和电致发光的配体依赖性。