Coherent two-dimensional spectroscopy: from photochemistry to exciton dynamics
Event details
| Date | 19.03.2015 |
| Hour | 16:00 › 17:00 |
| Speaker |
Dr Cristina Consani Universität Würzburg, Germany |
| Location | |
| Category | Conferences - Seminars |
Understanding photophysical and photochemical processes in complex molecular systems requires the capability of observing energy relaxation and disentangling different reaction pathways with high temporal and spectral resolution. Nonlinear ultrafast spectroscopies, among them coherent two-dimensional spectroscopy, are particularly suited for this purpose. These techniques allow investigating processes ranging from ultrafast isomerization to exciton dynamics in multicenter chromophores, as I will illustrate on different examples.
One example regards the dynamics of energy relaxation and transfer in polymeric compounds, a topic of wide interest for optoelectronics and photovoltaics. Especially the relationship between exciton dynamics and structure is a key parameter which is currently poorly understood. As a paradigmatic example, I will present a study on the polymer MEH-PPV (poly-[2-methoxy-5-(2‘-ethylhexyloxy)-1,4-phenylenevinylene]), where a disorder-order phase transition can be induced by lowering the temperature below a critical value. With a combination of spectroscopic techniques, among them coherent two-dimensional spectroscopy, we characterize the interplay between the disordered and ordered phase of MEH-PPV, as well as exciton dynamics in the low-temperature ordered phase, and we differentiate between two regimes of exciton relaxation.
One example regards the dynamics of energy relaxation and transfer in polymeric compounds, a topic of wide interest for optoelectronics and photovoltaics. Especially the relationship between exciton dynamics and structure is a key parameter which is currently poorly understood. As a paradigmatic example, I will present a study on the polymer MEH-PPV (poly-[2-methoxy-5-(2‘-ethylhexyloxy)-1,4-phenylenevinylene]), where a disorder-order phase transition can be induced by lowering the temperature below a critical value. With a combination of spectroscopic techniques, among them coherent two-dimensional spectroscopy, we characterize the interplay between the disordered and ordered phase of MEH-PPV, as well as exciton dynamics in the low-temperature ordered phase, and we differentiate between two regimes of exciton relaxation.
Practical information
- General public
- Free
Organizer
- Dr Frank van Mourik