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Photostimulable Fluorescent Nanoparticles for Biological Imaging

Published online by Cambridge University Press:  23 June 2011

Andres Osvet ,
Moritz Milde ,
Sofia Dembski ,
Sabine Rupp ,
Carsten Gellermann ,
Miroslaw Batentschuk ,
Christoph J. Brabec  and
Albrecht Winnacker
Andres Osvet
Affiliation:
Chair Materials for Electronics and Energy Technology, University of Erlangen-Nuremberg, Martensstr. 7, 91058 Erlangen, Germany
Moritz Milde
Affiliation:
Fraunhofer Institute for Silicate Research, Neunerplatz 2, 97082 Wuerzburg, Germany
Sofia Dembski
Affiliation:
Fraunhofer Institute for Silicate Research, Neunerplatz 2, 97082 Wuerzburg, Germany
Sabine Rupp
Affiliation:
Fraunhofer Institute for Silicate Research, Neunerplatz 2, 97082 Wuerzburg, Germany
Carsten Gellermann
Affiliation:
Fraunhofer Institute for Silicate Research, Neunerplatz 2, 97082 Wuerzburg, Germany
Miroslaw Batentschuk
Affiliation:
Chair Materials for Electronics and Energy Technology, University of Erlangen-Nuremberg, Martensstr. 7, 91058 Erlangen, Germany
Christoph J. Brabec
Affiliation:
Chair Materials for Electronics and Energy Technology, University of Erlangen-Nuremberg, Martensstr. 7, 91058 Erlangen, Germany
Albrecht Winnacker
Affiliation:
Chair Materials for Electronics and Energy Technology, University of Erlangen-Nuremberg, Martensstr. 7, 91058 Erlangen, Germany
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Abstract

Spherical monodisperse core/shell-type nanoparticles, comprising an amorphous SiO2 core coated with a luminescent phosphor layer were synthesized by the modified Pechini processes. The sol-gel method allows covering the 50 – 500 nm core particles with different inorganic phosphor layers of about 10 nm thickness, doped with rare-earth or transition metal ions which determine the luminescent properties. Particles comprising a Zn2SiO4 shell, doped with Mn2+ ions, are not only fluorescent under UV irradiation (260 nm), but store the activation energy by trapping electrons/holes at lattice defects. This energy is released as phosphorescence in the time scale of seconds and minutes, or as photostimulated luminescence under the excitation of red light (650 nm). Traps related to these processes are different, and their concentration is affected by the preparation conditions of the particles.

Keywords

optical propertiescore/shellsol-gel
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1342: Symposium V – Rare-Earth Doping of Advanced Materials for Photonic Applications , 2011 , mrss11-1342-v04-05
Copyright
Copyright © Materials Research Society 2011

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