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Photophysical Study of Perylene/TiO2and Perylene/ZnO Varying Interfacial Couplings and the Chemical Environment

Authors :
Neubauer, Antje
Szarko, Jodi M.
Bartelt, Andreas F.
Eichberger, Rainer
Hannappel, Thomas
Source :
The Journal of Physical Chemistry - Part C; April 2011, Vol. 115 Issue: 13 p5683-5691, 9p
Publication Year :
2011

Abstract

The impact of the chemical environment on heterogeneous electron transfer processes of two perylene derivatives chemically bound to ZnO or TiO2colloids in a film was investigated by means of absorption and fluorescence spectroscopy. The perylene molecules varied in their electronic coupling between the perylene moiety and a carboxylic acid group, which also bound the perylene dyes to the semiconductor surface. Significantly different excited state dipole moments for the two perylene derivatives were found for certain perylene−solvent interactions and were attributed to different intramolecular charge transfer characters of the excited state. It is concluded that lifetime broadening due to ultrafast electron injection plays only a minor role in explaining the observed strong broadening of the absorption spectra for the hybrid systems with strong electronic coupling. Rather, a strong environmental effect of the colloidal semiconductor has to be taken into account for the hybrid systems with strong interfacial couplings.

Details

Language :
English
ISSN :
19327447 and 19327455
Volume :
115
Issue :
13
Database :
Supplemental Index
Journal :
The Journal of Physical Chemistry - Part C
Publication Type :
Periodical
Accession number :
ejs23377476
Full Text :
https://doi.org/10.1021/jp109615b