Geminate and nongeminate recombination of triplet excitons formed by singlet fission

Geminate and nongeminate recombination of triplet excitons formed by singlet fission

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 singl...

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Veröffentlicht in:Physical review letters 2014-06, Vol.112 (23), p.238701-238701, Article 238701
Hauptverfasser: Bayliss, Sam L, Chepelianskii, Alexei D, Sepe, Alessandro, Walker, Brian J, Ehrler, Bruno, Bruzek, Matthew J, Anthony, John E, Greenham, Neil C
Format: Artikel
Sprache:eng
Schlagworte:
Electrons
Energy Transfer
Estimates
Excitons
Fission
Luminescence
Magnetic resonance
Magnetic Resonance Spectroscopy
Membranes, Artificial
Microwaves
Models, Theoretical
Organosilicon Compounds - chemistry
Physics
Solar Energy
Spectra
Stochastic Processes
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Zusammenfassung: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.112.238701