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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Molecular Electronics and Excited State Properties II

CPP 20.3: Vortrag

Montag, 16. März 2020, 15:30–15:45, ZEU 260

Exciton dynamics in optically active surface-mounted metal-organic frameworks: A time-resolved second harmonic generation study — •Vipilan Sivanesan¹, Ritesh Haldar², Christof Wöll², and Petra Tegeder¹ — ¹Physikalisch-Chemisches Institut, Universität Heidelberg, Germany — ²Institute of Functional Interfaces, Karlsruhe Institute of Technology, Germany

For the optimization of organic optoelectronic devices it is important to understand the ultrafast electronically excited state dynamics in organic semiconductors after optical excitation. For instance, different molecular packing and relative orientations of the optically active chromophores can affect the excitonic coupling strength. This can be studied in crystalline molecular assemblies by integrating these chromophores into surface-mounted metal-organic frameworks (SURMOFs) as organic linkers. Varying the side-groups of the molecules enables to engineer the crystal structure to tune the excitonic coupling. To analyse the influence of this crystal engineering on the ultrafast dynamics we investigated thin films of chromophore functionalized Zn-SURMOF by means of femtosecond time-resolved second harmonic generation.

Literature: [1] R. Haldar et al., Chem. Eur. J, 23, 14316 (2017) [2] R. Haldar et al., Nature Commun. 10:2048 (2019)