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