Heteroatom oxidation controls singlet–triplet energy splitting in singlet fission building blocks

Abstract

Singlet fission (SF) is a promising multiexciton-generating process. Its demanding energy splitting criterion – that the S1 energy must be at least twice that of T1 – has limited the range of materials capable of SF. We propose heteroatom oxidation as a robust strategy to achieve sufficient S1/T1 splitting, and demonstrate the potential of this approach for intramolecular SF.