Consortium of Swiss Academic Libraries

Synthesis of Zeolite L. Tuning Size and Morphology

Ruiz, Arantzazu Zabala ; Brühwiler, Dominik ; Ban, Takayuki ; Calzaferri, Gion

In: Monatshefte für Chemie / Chemical Monthly, 2005, vol. 136, no. 1, p. 77-89

Université de Fribourg

Supramolecular organization of dye molecules in zeolite L channels: synthesis, properties, and composite materials

Cao, Pengpeng ; Khorev, Oleg ; Devaux, André ; Sägesser, Lucie ; Kunzmann, Andreas ; Ecker, Achim ; Häner, Robert ; Brühwiler, Dominik ; Calzaferri, Gion ; Belser, Peter

In: Chemistry - A European Journal, 2016, vol. 22, no. 12, p. 4046–4060

Sequential insertion of different dyes into the 1D channels of zeolite L (ZL) leads to supramolecular sandwich structures and allows the formation of sophisticated antenna composites for light harvesting, transport, and trapping. The synthesis and properties of dye molecules, host materials, composites, and composites embedded in polymer matrices, including two- and three-color antenna systems,...

Université de Fribourg

Efficient and robust host–guest antenna composite for light harvesting

Devaux, André ; Calzaferri, Gion ; Belser, Peter ; Cao, Pengpeng ; Brühwiler, Dominik ; Kunzmann, Andreas

In: Chemistry of Materials, 2014, vol. 26, no. 23, p. 6878–6885

We report discovery of a new efficient and robust antenna composite for light harvesting. The organic dye hostasol red (HR) is strongly luminescent in aprotic solvents but only weakly luminescent in potassium zeolite L (ZL) at ambient conditions. We observed a dramatic increase of the luminescence quantum yield of HR–ZL composites if some or all exchangeable potassium cations of ZL are...

Université de Fribourg

Self-absorption and luminescence quantum yields of dye-zeolite L composites

Devaux, André ; Calzaferri, Gion ; Miletto, Ivana ; Cao, Pengpeng ; Belser, Peter ; Brühwiler, Dominik ; Khorev, Oleg ; Häner, Robert ; Kunzmann, Andreas

In: The Journal of Physical Chemistry C, 2013, vol. 117, no. 44, p. 23034–23047

Electronic absorption and fluorescence spectra based on transmission measurements of thin layers obtained from new perylene–zeolite L composites and new dye1,dye2–zeolite L sandwich composites, the latter acting as antenna systems, have been investigated and analyzed. The influence of extra- and intraparticle self-absorption on the spectral shape and fluorescence quantum yield is discussed in...

Université de Fribourg

Host–guest interactions and orientation of dyes in the one-dimensional channels of zeolite L

Fois, Ettore ; Tabacchi, Gloria ; Devaux, André ; Belser, Peter ; Brühwiler, Dominik ; Calzaferri, Gion

In: Langmuir, 2013, vol. 29, no. 29, p. 9188–9198

A combined experimental and modeling study of methylacridine (MeAcr⁺) dye-zeolite L composites unravels the microscopic origin of their functional properties. The anisotropic orientation of the cationic dye inside the ZL channel is unambiguously determined and understood. The most stable orientation of MeAcr⁺, which features both its long and short molecular axes nearly perpendicular to the...