title: Geminate and nongeminate recombination of triplet excitons formed by singlet fission.
abstract: We report the simultaneous observation of geminate and nongeminate triplet-triplet annihilation in a solution-processable small molecule TIPS-tetracene undergoing singlet exciton fission. Using optically detected magnetic resonance, we identify recombination of triplet pairs directly following singlet fission, as well as recombination of triplet excitons undergoing bimolecular triplet-triplet annihilation. We show that the two processes give rise to distinct magnetic resonance spectra, and estimate the interaction between geminate triplet excitons to be 60 neV.
authors: Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge, CB3 0HE, United Kingdom.
authors: Sam L
authors: SL
authors: Bayliss
authors: Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge, CB3 0HE, United Kingdom and LPS, Université Paris-Sud, CNRS, UMR 8502, F-91405, Orsay, France.
authors: Alexei D
authors: AD
authors: Chepelianskii
authors: Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge, CB3 0HE, United Kingdom.
authors: Alessandro
authors: A
authors: Sepe
authors: Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge, CB3 0HE, United Kingdom.
authors: Brian J
authors: BJ
authors: Walker
authors: Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge, CB3 0HE, United Kingdom.
authors: Bruno
authors: B
authors: Ehrler
authors: Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, USA.
authors: Matthew J
authors: MJ
authors: Bruzek
authors: Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, USA.
authors: John E
authors: JE
authors: Anthony
authors: Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge, CB3 0HE, United Kingdom.
authors: Neil C
authors: NC
authors: Greenham
mesh_terms: D004583:Electrons; D004735:Energy Transfer; D049449:Luminescence; D009682:Magnetic Resonance Spectroscopy; D008567:Membranes, Artificial; D008872:Microwaves; D008962:Models, Theoretical; D017646:Organosilicon Compounds / Q000737:chemistry*; D012993:Solar Energy; D013269:Stochastic Processes
chemical_list: D008567:Membranes, Artificial; D017646:Organosilicon Compounds