Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.064
Publication date: 6th July 2018
Colloidal nanoplatelets (NPLs) are quasi-two-dimensional nanocrystals with atomically precise thickness in one dimension. Due to their highly anisotropic shape, they offer favorable optical properties such as narrow emission linewidths and large absorption cross-sections.1,2 However, as-synthesized, NPLs exhibit poor photo- and chemical stability. Thus, strategies have been sought to improve their properties by adding a shell on the NPLs. For spherical quantum dots, recently developed recipes for growing high-quality shells are performed at high temperatures. However, to date, this strategy has not been extended to NPLs because of their low thermal stability compared to quantum dots.3 Here, we present a method for obtaining CdSe/CdS core/shell NPLs in which the shell is added at high temperatures (~300 °C).4 This enables the growth of uniform and thick CdS shells, which is not possible with existing continuous-growth protocols. We further extend this protocol to produce alloyed CdxZn1-xS shells with varying composition and thickness. We obtain high-quality monodisperse and stable core/shell NPLs with narrow emission linewidths, high QYs exceeding 70-80%, and suppressed blinking. Such samples exhibit tunable emission peaks that can result in improvements for a wide range of applications in optics and optoelectronics relying on efficient and narrow emitters.
1) S. Ithurria et al., Nat. Mater., 10, 936 (2011)
2) A. Yeltik et al., J. Phys. Chem. C, 119, 26768 (2015)
3) A. Riedinger et al., Nat. Mater., 16, 743 (2017)
4) A. A. Rossinelli et al., Chem. Commun., 53, 9938 (2017)
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