Journal
ACS NANO
Volume 2, Issue 1, Pages 120-124Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn7002458
Keywords
upconversion; colloidal nanoparticles; multicolor multiplexing; silica encapsulation
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Any labeling with multicolor markers can be affected by the autofluorescence of biological tissue due to the UV or blue light excitation sources, or the results are affected by fluorescence resonance energy transfer. In this work, we present novel IR-to-vis upconverting nanoparticles of different rare earth metal dopants. With a single excitation source of 980 nm, four different colors of nanocrystals can be spectrally separated under multiplexing conditions. The particles were phase transferred into polar solvents by means of silica encapsulation and were characterized by transmission electron microscopy, X-ray diffraction, and photoluminescence spectroscopy.
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