title: Opposite Anisotropy Effects of Singlet and Triplet Exciton Diffusion in Tetracene Crystal.
abstract: We observe the diffusion anisotropy difference between singlet and triplet excitons in organic crystals; that is, singlet and triplet excitons may have completely different spatial direction preference for diffusion. This phenomenon can be ascribed to the distinct dependence of different excitonic couplings (Coulomb Förster vs. exchange Dexter) existing in singlet and triplet excitons on their intermolecular distance and intermolecular orientation. Such a discovery provides insights for understanding the fundamental photophysical process in a vast range of organic condensed-phase systems and optimizing the efficiency of organic optoelectronic materials.
authors.affiliation: Key Laboratory of Mesoscopic Chemistry of the Ministry of Education (MOE) Collaborative Innovation Centre of Chemistry for Life Sciences School of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 P. R. China.
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Xie
authors.affiliation: Key Laboratory of Mesoscopic Chemistry of the Ministry of Education (MOE) Collaborative Innovation Centre of Chemistry for Life Sciences School of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 P. R. China.
authors.forename: Haibo
authors.initials: H
authors.lastname: Ma
keywords: anisotropy; exciton diffusion; optoelectronics; organic solar cells; tetracene