Saha Avijit, Konstantatos Gerasimos
ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology 08860 Castelldefels (Barcelona) Spain
ICREA-Institució Catalana de Recerca i Estudis Avancats, Passeig Lluís Companys 23 08010 Barcelona Spain.
J Mater Chem C Mater. 2021 Apr 6;9(17):5682-5688. doi: 10.1039/d1tc00421b.
Low cost, multinary colloidal quantum dots (QDs) based on environmentally friendly elements, with bright, narrow-width, tunable near-infrared (NIR) luminescence are promising alternatives to Cd and Pb chalcogenide QDs for bio-imaging, LED and sensing applications. Herein, we demonstrate Pb/Cd free solution-processed colloidal luminescent AgZnSnS-ZnS (AZTS-ZnS) core-shell QDs with precise control over the ZnS shell thickness and thereby its optical properties. Unlike indium based multinary (I-III-VI group) core-shell QDs these nanocrystals show a narrow photoluminescence (PL) full width at half maximum (fwhm) of 105-110 meV in the first NIR window. By monitoring the starting AZTS core size, we achieve tunable emission over a small NIR window in these QDs with the best PL quantum yield (PLQY) of 17.4%.
基于环境友好元素的低成本多元素胶体量子点（QDs），具有明亮、窄带宽、可调谐的近红外（NIR）发光特性，有望成为用于生物成像、发光二极管和传感应用的镉和铅硫族化物量子点的替代品。在此，我们展示了无铅/镉的溶液处理胶体发光AgZnSnS-ZnS（AZTS-ZnS）核壳量子点，能够精确控制ZnS壳层厚度及其光学性质。与基于铟的多元素（I-III-VI族）核壳量子点不同，这些纳米晶体在第一个近红外窗口显示出半高宽（fwhm）为105-110 meV的窄光致发光（PL）。通过监测起始AZTS核尺寸，我们在这些量子点的小近红外窗口内实现了可调谐发射，最佳光致发光量子产率（PLQY）为17.4%。
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