Distinct properties of the triplet pair state from singlet fission.

ABSTRACT: Singlet fission, the conversion of a singlet exciton (S₁) to two triplets (2 × T₁), may increase the solar energy conversion efficiency beyond the Shockley-Queisser limit. This process is believed to involve the correlated triplet pair state ¹(TT). Despite extensive research, the nature of the ¹(TT) state and its spectroscopic signature remain actively debated. We use an end-connected pentacene dimer (BP0) as a model system and show evidence for a tightly bound ¹(TT) state. It is characterized in the near-infrared (IR) region (~1.0 eV) by a distinct excited-state absorption (ESA) spectral feature, which closely resembles that of the S₁ state; both show vibronic progressions of the aromatic ring breathing mode. We assign thes

SUBMITTER: Trinh MT 

PROVIDER: S-EPMC5510972 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature