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Efficient and robust host–guest antenna composite for light harvesting

  • Devaux, André Department of Chemistry, University of Fribourg, Switzerland
  • Calzaferri, Gion Department of Chemistry and Biochemistry, University of Bern, Switzerland
  • Belser, Peter Department of Chemistry, University of Fribourg, Switzerland
  • Cao, Pengpeng Department of Chemistry, University of Fribourg, Switzerland
  • Brühwiler, Dominik Institute of Chemistry and Biological Chemistry, Zürich University of Applied Sciences, Wädenswil, Switzerland
  • Kunzmann, Andreas Optical Additives, Gümligen, Switzerland
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  • Chemistry of Materials. - 2014, vol. 26, no. 23, p. 6878–6885
English 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 substituted by an organic imidazolium cation (IMZ+) and if the acceptor HR is embedded in the middle part of the channels, so that it is fully protected by the environment of the perylene dye tb-DXP. This led to the discovery of a highly efficient donor,acceptor-ZL antenna material where tb-DXP acts as donor and HR acts as acceptor. The material has a donor-to-acceptor (D/A) absorption ratio of more than 100:1 and a nearly quantitative FRET efficiency. Synthesis of this host–guest material is reported. We describe a successful procedure for achieving full sealing of the ZL channel entrances such that the guests cannot escape. This new material is of great interest for applications in luminescent solar concentrator (LSC) devices because the efficiency killing self-absorption is very low.
Faculté des sciences et de médecine
Département de Chimie
  • English
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