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
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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