(Invited) Novel Acene-Based Molecules and Materials for Singlet Fission

Abstract

Singlet fission (SF) is a multi-exciton generation process in two neighboring organic chromophores (S1 + S0) where two individual triplet excitons (T1 + T1) are generated from one-photon absorption through a correlated triplet pair (TT). Therefore, SF is highly promising for construction of next-generation light energy conversion systems and quantum information science. In addition to the close interaction of two neighboring chromophores, energy-level matching condition between a singlet and two triplet states: [E(S1) ≥ 2E(T1)] are required for efficient SF.Observation of SF was widely discussed under various condition such as solid-state films and covalently-linked molecular dimers in homogeneous solution. In contrast, inorganic nanomaterials such as quantum dots and metal nanoclusters demonstrated the characteristic optical and electrochemical properties as compared to organic molecules. However, the number of organic-inorganic hybrid systems for efficient SF is extremely limited.1-3 Furthermore, there are no reports regarding SF systems using liquid molecules.4 In this presentation, we present our recent research results regarding novel acene-based molecules and materials for SF. References Sakai, H.; Inaya, R.; Tkachenko, N. V.; Hasobe, T. Chem. Eur. J. 2018, 24, 17062-17071. Saegusa, T.; Sakai, H.; Nagashima, H.; Kobori, Y.; Tkachenko, N. V.; Hasobe, T. J. Am. Chem. Soc. 2019, 141, 14720-14727. Zhang, J.; Sakai, H.; Suzuki, K.; Hasobe, T.; Tkachenko, N. V.; Chang, I. Y.; Hyeon-Deuk, K.; Kaji, H.; Teranishi, T.; Sakamoto, M. J. Am. Chem. Soc. 2021, 143, 17388-17394. Yoshino, K.; Sakai, H.; Shoji, Y.; Kajitani, T.; Anetai, H.; Akutagawa, T.; Fukushima, T.; Tkachenko, N. V.; Hasobe, T. J. Phys. Chem. B 2020, 124, 11910-11918.