Singlet fission (SF) is a multiple exciton generation process that coverts one singlet exciton into two triplet excitons in multichromophore organic systems. The recent discovery of intramolecular singlet fission compounds (iSF), in which SF occurs in isolated molecules without nearest neighbor interactions, has facilitated the development of structure-function relationships that can be used to optimize the generation and lifetime of triplet excitons. However, iSF materials have mostly taken the form of molecular dimers. While these compounds highlight the minimum requirements for achieving efficient SF, they offer limited degrees of freedom in terms of tunability in their structural and electronic properties. Furthermore, the transport of free triplets is constrained by the few numbers of chromophores. Here, I will discuss the evolution and dynamics of multiexciton states as we move beyond dimers to extended multichromophore systems such as oligomers and polymers. I will demonstrate how molecular engineering concepts can be used to independently optimize the rates of triplet pair formation, triplet pair dephasing, and triplet decay in both solution and thin films. Finally, I will discuss a general framework that can be used to quantify and evaluate the overall performance of SF materials.<br/>

Intramolecular singlet fission in extended systems: Oligomers, polymers, and films

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.