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서영덕

Suh, Yung Doug
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Comparative Study of Upconverting Nanoparticles with Various Crystal Structures, Core/Shell Structures, and Surface Characteristics

Author(s)
Park, Yong IlNam, Sang HwanKim, Jeong HyunBae, Yun MiYoo, ByeongjunKim, Hyung MinJeon, Ki-SeokPark, Hyo SunChoi, Joon SigLee, Kang TaekSuh, Yung DougHyeon, Taeghwan
Issued Date
2013-02
DOI
10.1021/jp3105248
URI
https://scholarworks.unist.ac.kr/handle/201301/58767
Fulltext
https://pubs.acs.org/doi/10.1021/jp3105248
Citation
JOURNAL OF PHYSICAL CHEMISTRY C, v.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.
Publisher
AMER CHEMICAL SOC
ISSN
1932-7447
Keyword
UP-CONVERSION LUMINESCENCEDOPED NAYF4 NANOCRYSTALSMAGNETIC-RESONANCEMONODISPERSE NANOCRYSTALSFLUORESCENT NANOCRYSTALSCONTRAST AGENTNANOPHOSPHORSSHELLCORENANOPROBES

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