Geminate and nongeminate recombination of triplet excitons formed by singlet fission.
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Peer-reviewed
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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.
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Electrons, Energy Transfer, Luminescence, Magnetic Resonance Spectroscopy, Membranes, Artificial, Microwaves, Models, Theoretical, Organosilicon Compounds, Solar Energy, Stochastic Processes
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Phys Rev Lett
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0031-9007
1079-7114
1079-7114
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American Physical Society (APS)
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Engineering and Physical Sciences Research Council (EP/G060738/1)
Engineering and Physical Sciences Research Council (EP/J017361/1)
Engineering and Physical Sciences Research Council (EP/J017361/1)
EPSRC [grant no. EP/J017361/1 and EP/G060738/1]. E. Oppenheimer Foundation and St. Catherine's College, Cambridge. NSF [CMMI- 1255494].