11:00 AM - EQ12.08.03
Amplification of Optoelectronic Properties through Homoconjugation in Three-Dimensional Molecular Structures
The development of new molecular and macromolecular materials for organic light emitting devices (OLEDs) and organic solar cells (OSCs) is constantly evolving thanks to new insights into the interactions between light and matter. There is a great deal of work currently underway towards harnessing useful excited state properties of organic molecules and polymers such as room temperature phosphorescence, thermally activated delayed fluorescence, and singlet fission , making use of intermolecular interactions between individual donor and acceptor molecules which can yield efficient luminescence and simple devices.
The influence of three-dimensional molecular topology on the photophysical and electrochemical behaviour of organic semiconducting materials can be truly defining in how well such a molecule performs in any given application. Small changes in, for example, the dihedral angle between two rings in a molecule can make the difference between efficient or poor luminescence, charge transport, processability etc.[4-5]
Structure property relationships which take consideration of molecular geometry in three dimensions are required.
Here, the results of studies on new organic molecules which have been designed to make use of twisted, contorted or otherwise three-dimensionally defined structures will be presented. Using such 3D structures allows us to exploit or enhance photophysical processes towards obtaining higher efficiencies in organic electronic applications.
Particular focus will be given to the exploitation of homoconjugation – the through-space overlap of molecular orbitals – on the enhancement of defining photophysical parameters of new donor-acceptor compounds for use in OLEDs and OSCs. 
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