Details

Autor(en) / Beteiligte

• Calzaferri, Gion
• Méallet-Renault, Rachel
• Brühwiler, Dominik
• Pansu, Robert
• Dolamic, Igor
• Dienel, Thomas
• Adler, Pauline
• Li, Huanrong
• Kunzmann, Andreas

Titel

Designing Dye-Nanochannel Antenna Hybrid Materials for Light Harvesting, Transport and Trapping

Ist Teil von

• Chemphyschem, 2011-02, Vol.12 (3), p.580-594

Ort / Verlag

Weinheim: WILEY-VCH Verlag

Erscheinungsjahr

2011

Link zum Volltext

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• We discuss artificial photonic antenna systems that are built by incorporating chromophores into one‐dimensional nanochannel materials and by organizing the latter in specific ways. Zeolite L (ZL) is an excellent host for the supramolecular organization of different kinds of molecules and complexes. The range of possibilities for filling its one‐dimensional channels with suitable guests has been shown to be much larger than one might expect. Geometrical constraints imposed by the host structure lead to supramolecular organization of the guests in the channels. The arrangement of dyes inside the ZL channels is what we call the first stage of organization. It allows light harvesting within the volume of a dye‐loaded ZL crystal and also the radiationless transport of energy to either the channel ends or center. One‐dimensional FRET transport can be realized in these guest–host materials. The second stage of organization is realized by coupling either an external acceptor or donor stopcock fluorophore at the ends of the ZL channels, which can then trap or inject electronic excitation energy. The third stage of organization is obtained by interfacing the material to an external device via a stopcock intermediate. A possibility to achieve higher levels of organization is by controlled assembly of the host into ordered structures and preparation of monodirectional materials. The usually strong light scattering of ZL can be suppressed by refractive‐index matching and avoidance of microphase separation in hybrid polymer/dye–ZL materials. The concepts are illustrated and discussed in detail on a bidirectional dye antenna system. Experimental results of two materials with a donor‐to‐acceptor ratio of 33:1 and 52:1, respectively, and a three‐dye system illustrate the validity and challenges of this approach for synthesizing dye–nanochannel hybrid materials for light harvesting, transport, and trapping. A photonic antenna for light harvesting and trapping is presented. The chromophores are embedded in the channels of the host. The green dyes act as donors which absorb the incoming light and transport the electronic excitation energy to the red acceptors located at the ends of the channels. The double arrows indicate the orientation of the electronic transition dipole moments.