Journal article

Competitive Triplet Formation and Recombination in Crystalline Films of Perylenediimide Derivatives: Implications for Singlet Fission

Saghar Masoomi-Godarzi, Christopher R Hall, Bolong Zhang, Mark A Gregory, Jonathan M White, Wallace WH Wong, Kenneth P Ghiggino, Trevor A Smith, David J Jones



Developing photostable compounds that undergo quantitative singlet fission (SF) is a key challenge. As SF necessitates electron transfer between neighboring molecules, the SF rate is highly sensitive to intermolecular coupling in the solid state. We investigate SF in thin films for a series of perylenediimide (PDI) molecules. By adding different substituents at the imide positions, the packing of the molecules in the solid state can be changed. The relationship between SF parameters and the stacked geometry in PDI films is investigated, with two-electron direct coupling found to be the main SF mechanism. Time-resolved emission and transient absorption data show that all of the PDI films unde..

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Awarded by ARC Centre of Excellence in Exciton Science

Funding Acknowledgements

This work was supported by the Australian Renewable Energy Agency, which funds the project grants within the Australian Centre for Advanced Photovoltaics. This work was also supported by the ARC Centre of Excellence in Exciton Science (CE170100026). Responsibility for the views, information, or advice expressed herein is not accepted by the Australian Government. We gratefully acknowledge the SAXS/WAXS beamline and beamtime via the Collaborative Access Program (proposal number 13618b) at the Australian Synchrotron.