Abstract
Polarization-dependent absorption spectra of two functionalized derivatives of fluorinated anthradithiophene, diF TES-ADT and diF TDMS-ADT, were studied in the crystal phase using a Holstein-like Hamiltonian. For both molecules, the primary contribution to the lowest energy absorption was found to be the S0-S1 excitonic transition perturbed by an intermolecular coupling of 15 meV for both TES and TDMS. A secondary contribution, consistent with that from charge-transfer states, was also found. Additionally, absorption spectra were analysed when crystals were placed inside of optical microcavities formed by two metal mirrors. Cavities exhibited a primary absorption peak determined to be an enhanced absorption from the lowest-energy S0-S1 transition.
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Van Schenck, J.D.B., Giesbers, G., Kannegulla, A. et al. Molecular Packing-Dependent Exciton and Polariton Dynamics in Anthradithiophene Organic Crystals. MRS Advances 3, 3465–3470 (2018). https://doi.org/10.1557/adv.2018.471
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DOI: https://doi.org/10.1557/adv.2018.471