Abstract
The intermediate state of a correlated triplet pair [1(TT)] is pivotal for understanding the mechanism of the singlet fission process in molecule systems. Recently, a spatially separated state of a triplet pair [1(T⋯T)] has been proposed to drive the dissociation of exchange-coupled 1(TT) into free triplets. Here, we study the correlated triplet pairs by monitoring quantum beats in delayed fluorescence from tetracene crystals upon applying magnetic fields of different amplitudes and alignments. We argue that the triplet pairs probed by the quantum beat spectrum are weakly coupled, i.e., the spatially separated 1(T⋯T) state. The experimental data suggest the existence of a direct channel of S1 → 1(T⋯T) in addition to the widely accepted channel of S1 → 1(TT) → 1(T⋯T) for singlet fission. Our work suggests that the quantum beat spectrum is a useful tool to directly probe the 1(T⋯T) state which is valuable for elucidating the intrinsic mechanism of singlet fission.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
