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Lecture H.-J. Egelhaaf

Rooster

WanneerWaar
18 mei 2009 FWN-Building 5114.0004, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. H.-J. Egelhaaf
Affiliation: Konarka Technologies GmbH, Nuernberg, Germany
Title: Organic supramolecular nanosctructured host-guest compounds: dynamics of molecules and excitons
Date: Mon May 18, 2009
Start: 16.00
Location: FWN-Building 5114.0004
Host: Maria Antoinetta Loi
Telephone: +31 50 363 4119

Abstract

Energy transfer in condensed systems of organic dyes to the sites of charge separation is the first step of conversion of light into power, both in natural and in artificial light harvesting systems. The prediction of power conversion efficiencies requires the detailed knowledge of mechanism, geometries (distributions), and photophysical parameters. Correct modeling of experimental data reveals insights into the details of these processes which are not always according to intuition. In order to have full control over the input parameters of the numerical model, we study highly aligned supramolecular host-guest systems which combine the advantages of high dye densities and well defined geometries.

These host-guest compounds consist of perhydrotriphenylene (PHTP) molecules, which form channels around rod-like dye molecules like oligo(phenylenevinylene)s or oligothiophenes.

The dye molecules are immobilized in a well defined geometry. Both the intramolecular and the overall mobilities of the dye molecules are restricted by inclusion into the matrix, which will be shown by Raman, NMR, and photoluminescence spectroscopy. The immobilization of conformationally flexible dyes changes their photophysics significantly. Due to the well defined geometry of the system energy transfer can be modelled with high precision without invoking arbitrary parameters. By using quantum chemical methods for the calculation of the energy transfer steps, unprecedented accuracy is achieved.

 

Laatst gewijzigd:22 oktober 2012 14:30