Please use this identifier to cite or link to this item: https://doi.org/10.1021/nn4009214
Title: Prevalence of anisotropic shell growth in rare earth core-shell upconversion nanocrystals
Authors: Zhang, C.
Lee, J.Y. 
Keywords: anisotropy
core-shell
photoluminescence
rare earth
upconversion nanocrystals
Issue Date: 28-May-2013
Citation: Zhang, C., Lee, J.Y. (2013-05-28). Prevalence of anisotropic shell growth in rare earth core-shell upconversion nanocrystals. ACS Nano 7 (5) : 4393-4402. ScholarBank@NUS Repository. https://doi.org/10.1021/nn4009214
Abstract: Through a series of carefully executed experiments, we discovered the prevalence of anisotropic shell growth in many upconversion NaREF4 systems caused by a combination of factors: selective adsorption of ligands on the core surface due to the core crystal structure, ligand etching, and the lattice mismatch between core and shell components. This could lead to incomplete shell formation in core-shell nanocrystals under certain conditions. Shell growth is always faster in the a and b crystallographic directions than in the c direction. In the case of a larger lattice mismatch between the core and shell, shell growth only occurs in the a and b directions resulting in an oblong core-shell structure. These findings are useful for rationalizing shell-dependent emission properties, understanding the emission mechanisms in complex core-shell nanostructures, and for creating accurate models of core-shell designs for multifunctionality and optimal performance in applications. © 2013 American Chemical Society.
Source Title: ACS Nano
URI: http://scholarbank.nus.edu.sg/handle/10635/89932
ISSN: 19360851
DOI: 10.1021/nn4009214
Appears in Collections:Staff Publications

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