Abstract
We have investigated the effects ofPb2+ addition on the morphological development of CdSe nanocrystals. We show that theaddition of Pb ions in the initial precursor solution changed the morphology of CdSenanocrystals to branched rods with high aspect ratio. The branched nanocrystals aremainly composed of wurzite phase grown along the [001] direction and the length ofrods in each branched nanocrystal can be increased by increasing the amount ofPb2+ addition to accelerate the anisotropic growth of the nanocrystals. The luminescence,however, mostly arises from trap-related recombination and is significantly red-shifted byPb2+ addition. Surface passivations of the branched nanocrystals with ZnS were proved to beeffective in eliminating trap emission and enhancing band-edge emission, leading to a largerquantum yield.
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