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Effective improvement in optical properties of colloidal CdTe@ZnS quantum dots synthesized from aqueous solution

机译:有效改善水溶液合成胶体CdTe @ ZnS量子点的光学性能

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摘要

Efficient synthesis of high-quality quantum dots (QDs) with excellent optical properties by aqueous synthesis is still of great significance for extended optical applications. Herein we highlight the advantages in optical properties of colloidal CdTe@ZnS QDs prepared by a facile and highly effective aqueous synthesis method. These achievements were realized by delicate manipulation of the conditions involved in nucleation and the growth process. Transmission electron microscopy (TEM) images indicated the QDs were uniform size and well dispersible. The emission peaks of the as-prepared QDs could shift from 496 to 698 nm with narrow full width at half maximum (FWHM), and the corresponding fluorescent color changed from green to red. Moreover, the emission could even reach to the near-infrared (NIR) region (706-796 nm) by extending the reaction time. The highest photoluminescence (PL) quantum yield (QY) of the QDs could reach to 60%, and the average of FWHM was about 55 nm. To address the problem of wide size-distribution in PL QY decrease and FWHM broadening, the colloids of QDs prepared at long reaction time (above 3 h) were centrifuged (12 000 r min(-1)). In addition, the assessment of QD cytotoxicity indicated the CdTe@ZnS QDs were much less cytotoxic and showed good biocompatibility. Compared with organic synthesis, our aqueous synthesis of QDs could be carried out efficiently on a large scale and showed good batch-to-batch reproducibility. The as-prepared CdTe@ZnS QDs exhibited excellent optical properties and hold a good potential to be applied in optoelectronic and biological applications.
机译:通过水合成有效合成具有优异光学性能的高质量量子点(QD)对于扩展光学应用仍然具有重要意义。在本文中,我们重点介绍了通过简便高效的水合成方法制备的胶体CdTe @ ZnS量子点在光学性能方面的优势。这些成就是通过对成核和生长过程所涉及条件的精细控制而实现的。透射电子显微镜(TEM)图像表明量子点尺寸均匀且分散性好。制备好的量子点的发射峰可以从496 nm变为698 nm,半峰全宽(FWHM)变窄,并且相应的荧光颜色从绿色变为红色。此外,通过延长反应时间,发射甚至可以达到近红外(NIR)区域(706-796 nm)。量子点的最高光致发光(PL)量子产率(QY)可以达到60%,并且FWHM的平均值约为55 nm。为了解决PL QY减小和FWHM加宽导致尺寸分布较宽的问题,将在较长反应时间(3 h以上)制备的QD胶体进行了离心(12000 r min(-1))。此外,对QD细胞毒性的评估表明CdTe @ ZnS QD的细胞毒性小得多,并显示出良好的生物相容性。与有机合成相比,我们的QD的水合成可以大规模有效地进行,并显示出良好的批间重现性。所制备的CdTe @ ZnS QD表现出优异的光学性能,具有在光电和生物应用中的良好潜力。

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