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M. Kronstein, J. Akbarzadeh, C. Drechsel, H. Peterlik, M.-A. Néouze:
"Tailoring Photoluminescence Properties in Ionic Nanoparticle Networks";
Chemistry - A European Journal, 20 (2014), 34; 10763 - 10774.

To investigate the original and promising luminescence properties of ionic nanoparticle networks (INN), various material compositions were investigated. In this work, the linker used to network the silica nanoparticles was varied; numerous substituted or non-substituted imidazolium, pyrazolium and pyridinium linkers are presented. Photoluminescence experiments on the INN hybrid materials revealed strong emission bands over a broad range in the visible region of the light spectrum. Varying the aromatic linker between the imidazolium units induced clear shifts of the emission maxima up to 100 nm, as a consequence of π-π stacking interactions. Steric hindrance and inductive effects of the substituents, introduced on the aromatic units, also strongly influenced the luminescence properties of the materials by modifying the π-π stacking between the imidazolium rings. Small and wide-angle X-ray scattering (SAXS, WAXS) experiments revealed a clear trend between the obtained structural parameters (short-range order parameter and distance of the aromatic units within the hybrid material) and the luminescence quantum yields of the INN materials.

nanoparticles; networks; photoluminescence; SAXS; silica

http://dx.doi.org/10.1002/chem.201400392

Project Head Marie-Alexandra Néouze:
Ionische Verknüpfung von Nanopartikeln