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    Light-Induced Dynamics in Molecular Aggregates

    DFG Forschergruppe 1809:

    Light-Induced Dynamics in Molecular Aggregates

    Molecular aggregates form the basis for several scientific and technological developments that increasingly gain economic relevance. Especially in the field of optical applications such systems are used because of their widely tunable properties. Decisive for the materials’ functions are the light-induced dynamics which in turn are determined by the manifold of interactions between the aggregated building blocks. The interactions can be varied through the properties of the individual molecular subunits, but also via their spatial arrangement. The aim of this Research Unit (FOR 1809) is to develop an understanding of how the specifically arranged molecular building blocks in aggregates can result in a desired light-induced dynamic and thus function of the whole system. The project essentially benefits from close collaborations between work groups with an expertise in the preparative, spectroscopic and theoretical field.

    To produce the systems we combine chemical synthesis and supramolecular self-organization (“bottom-up” process) with physical methods of targeted separation and morphology control on the nanoscale. In the field of spectroscopy, the applied methods range from frequency-resolved techniques and photoconductivity measurements to time-resolved coherent two-dimensional spectroscopy. Quantum-chemical and quantum-dynamical calculations and simulations make it possible to analyze and interpret the data on a quantitative basis. Using this interdisciplinary and cooperative approach, the Research Unit will develop a deeper understanding of basic processes of light-induced dynamics in molecular aggregates, which will allow for the production of new materials and material systems that possess tailor-made characteristics.

    Central concept of the Research Unit. The arrangement of molecular systems in aggregates leads to specific couplings and thus to dynamic properties that have an important influence on the function of the system (e. g. energy transport).

    The Research Unit consists of the closely linked projects P1 to P7 and the associated projects A1 to A3.

    P1 Hierarchical organization of perylene bisimide fluorophores towards multichromophore molecular assemblies and photonic materials Prof. Dr.
    Würthner
    P2 Low-bandgap dye conjugates Prof. Dr.
    Lambert
    P3 Coherent multidimensional femtosecond spectroscopy Prof. Dr.
    Brixner
    P4 Quantum-chemical description of light-induced processes considering environmental effects Prof. Dr.
    Engels
    P5 Quantum-dynamical studies on environmental effects in charge and energy transfer processes Prof. Dr.
    Engel
    P6 Dynamics of photo- excited charge carriers in self-organized organic volume semiconductors PD Dr.
    Deibel
    Prof. Dr.
    Dyakonov


    P7 Excitonic excitations in spatially limited molecular structures Prof. Dr.
    Pflaum
    P8 Light-induced nonadiabatic energy- and charge transfer dynamics Prof. Dr.
    Mitric
    For further information on the projects, please click on the corresponding title in the above table or select a project from the navigation bar on the left.