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Rare‐Earth Nanoparticles with Enhanced Upconversion Emission and Suppressed Rare‐Earth‐Ion Leakage
Author(s) -
Wang YeFu,
Sun LingDong,
Xiao JiaWen,
Feng Wei,
Zhou JiaCai,
Shen Jie,
Yan ChunHua
Publication year - 2012
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201103485
Subject(s) - photon upconversion , nanoparticle , rare earth , materials science , nanotechnology , emission intensity , ion , particle size , optoelectronics , chemical engineering , chemistry , doping , metallurgy , organic chemistry , engineering
Upconversion emissions from rare‐earth nanoparticles have attracted much interest as potential biolabels, for which small particle size and high emission intensity are both desired. Herein we report a facile way to achieve NaYF 4 :Yb,Er@CaF 2 nanoparticles (NPs) with a small size (10–13 nm) and highly enhanced (ca. 300 times) upconversion emission compared with the pristine NPs. The CaF 2 shell protects the rare‐earth ions from leaking, when the nanoparticles are exposed to buffer solution, and ensures biological safety for the potential bioprobe applications. With the upconversion emission from NaYF 4 :Yb,Er@CaF 2 NPs, HeLa cells were imaged with low background interference.