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Comparative study of upconverting nanoparticles with various crystal structures, core/shell structures, and surface characteristics

Cited 52 time in Web of Science Cited 55 time in Scopus
Authors

Park, Yong Il; Nam, Sang Hwan; Kim, Jeong Hyun; Bae, Yun Mi; Yoo, Byeongjun; Kim, Hyung Min; Jeon, Ki-Seok; Park, Hyo Sun; Choi, Joon Sig; Lee, Kang Taek; Suh, Yung Doug; Hyeon, Taeghwan

Issue Date
2013-02
Publisher
American Chemical Society
Citation
Journal of Physical Chemistry C, Vol.117 No.5, pp.2239-2244
Abstract
Upconverting nanoparticles (UCNPs) have been studied as novel bioimaging probes owing to the absence of autofluorescence and excellent photostability. For practical applications, biocompatible UCNPs with high upconversion efficiency, bright luminescence, and good colloidal stability are desirable. Herein, we report a quantitative and systematic study on the upconversion luminescence from a set of NaYF4:Yb3+,Er3+-based nanopartides by varying crystal structures, core/shell structures, and surface ligands. Upconversion luminescent properties in colloidal solution and at the single-particle level were examined. Hexagonal-phase core/shell UCNPs exhibited the most intense luminescence among various structures, while the excellent photostability was observed in all different types of UCNPs. To optimize the biomedical imaging capability of UCNPs, various surface coating strategies were tested. By quantitative spectroscopic measurements of surface-modified UCNPs in water, it was suggested that encapsulation with polyethylene glycol (PEG)-phospholipid was found to be effective in retaining both upconversion luminescence intensity and dispersibility in aqueous environment. Finally, UCNPs with different crystal structures were applied and compared in live cells.
ISSN
1932-7447
URI
https://hdl.handle.net/10371/166161
DOI
https://doi.org/10.1021/jp3105248
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