Geminate and Nongeminate Recombination of Triplet Excitons Formed by Singlet Fission
Geminate and Nongeminate Recombination of Triplet Excitons Formed by Singlet Fission
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DOI：
10.1103/physrevlett.112.238701
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发表时间：
2014-06-09
影响因子：
8.6
通讯作者：
Greenham, Neil C.
中科院分区：
文献类型：
--
作者：
Bayliss, Sam L.;Chepelianskii, Alexei D.;Greenham, Neil C.
我们报道了在溶液可加工的小分子tips -四烯中同时观察到双态和非双态三重态湮灭发生单线态激子裂变。利用光学探测磁共振，我们确定了在单线态裂变后直接发生的三重态对重组，以及经历双分子三重态-三重态湮灭的三重态激子重组。我们证明了这两个过程产生了不同的磁共振谱，并估计双三重态激子之间的相互作用为60 neV。
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.