title: A four-color colloidal multiplexing nanoparticle system.
abstract: 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.
authors.affiliation: Freiburg Materials Research Center, University of Freiburg, Germany.
authors.forename: Oliver
authors.initials: O
authors.lastname: Ehlert
authors.forename: Ralf
authors.initials: R
authors.lastname: Thomann
authors.forename: Masih
authors.initials: M
authors.lastname: Darbandi
authors.forename: Thomas
authors.initials: T
authors.lastname: Nann
mesh_terms: D003102:Colloids; D003116:Color; D028581:Lanthanoid Series Elements / Q000737:chemistry; D049449:Luminescence; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D014961:X-Ray Diffraction
chemical_list: D003102:Colloids; D028581:Lanthanoid Series Elements