Low-power upconversion in dye-doped polymer nanoparticles.
Examples of nanoscale low-power upconverting systems are rapidly increasing because of their potential application in numerous areas such as bioimaging or drug delivery. The fabrication of dye-doped cross-linked rubbery nanoparticles that exhibit upconversion even at relatively low power densities is reported here. The nanoparticles were prepared by surfactant-free emulsion polymerization of n-butylacrylate with divinylbenzene as a cross-linker, followed by dyeing of the resulting particles with a two-chromophore system composed of a palladium porphyrin sensitizer, and diphenylanthracene. Blue emission (≈440 nm) of these systems was observed upon excitation at 532 nm. In addition to their optical properties, the particles were characterized by electron microscopy and dynamic light scattering.
Adolphe Merkle Institute and Fribourg Center for Nanomaterials, University of Fribourg, Rte de l'Ancienne Papeterie, P.O. Box 209, 1723 Marly, Switzerland. yoan.simon@unifr.ch
Yoan C
YC
Simon
Shuo
S
Bai
Michelle K
MK
Sing
Hervé
H
Dietsch
Marc
M
Achermann
Christoph
C
Weder
D004396:Coloring Agents / Q000737:chemistry*; D004655:Emulsions / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry*; D058105:Polymerization; D011108:Polymers / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*
C517923:(2,2'-6',2'')-terpyridine; D004396:Coloring Agents; D004655:Emulsions; D011108:Polymers; D011725:Pyridines