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Tailoring the morphology of CdSe nanocrystals by incorporation of Pb

机译：通过掺入铅来定制CdSe纳米晶体的形貌

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摘要

We have investigated the effects of Pb2+ addition on the morphological development of CdSe nanocrystals. We show that the addition of Pb ions in the initial precursor solution changed the morphology of CdSe nanocrystals to branched rods with high aspect ratio. The branched nanocrystals are mainly composed of wurzite phase grown along the [001] direction and the length of rods in each branched nanocrystal can be increased by increasing the amount of Pb2+ addition to accelerate the anisotropic growth of the nanocrystals. The luminescence, however, mostly arises from trap-related recombination and is significantly red-shifted by Pb2+ addition. Surface passivations of the branched nanocrystals with ZnS were proved to be effective in eliminating trap emission and enhancing band-edge emission, leading to a larger quantum yield.
机译：我们已经研究了添加Pb2 +对CdSe纳米晶体形态发展的影响。我们表明，在初始前体溶液中添加Pb离子将CdSe纳米晶体的形态改变为具有高纵横比的分支棒。支链纳米晶体主要由沿[001]方向生长的纤锌矿相组成，并且可以通过增加Pb2 +的添加量来增加每个支链纳米晶体中棒的长度，以加速纳米晶体的各向异性生长。然而，发光主要来自陷阱相关的重组，并且由于添加Pb2 +而显着红移。事实证明，用ZnS对支化纳米晶体进行表面钝化可有效消除陷阱发射并增强带边发射，从而提高量子产率。

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