Rare‐Earth Nanoparticles with Enhanced Upconversion Emission and Suppressed Rare‐Earth‐Ion Leakage
Ions
Luminescent Agents
Microscopy, Confocal
Luminescent Measurements
Humans
Nanoparticles
Metals, Rare Earth
02 engineering and technology
Particle Size
0210 nano-technology
01 natural sciences
HeLa Cells
0104 chemical sciences
DOI:
10.1002/chem.201103485
Publication Date:
2012-04-04T19:53:23Z
AUTHORS (7)
ABSTRACT
AbstractUpconversion 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 NaYF4:Yb,Er@CaF2 nanoparticles (NPs) with a small size (10–13 nm) and highly enhanced (ca. 300 times) upconversion emission compared with the pristine NPs. The CaF2 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 NaYF4:Yb,Er@CaF2 NPs, HeLa cells were imaged with low background interference.
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