7 October 2014 Quantifying singlet fission in novel organic materials using nonlinear optics
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Singlet fission is a form of multiple exciton generation in which two triplet excitons are produced from the decay of a photoexcited singlet exciton. In a small number of organic materials, most notably pentacene, this conversion process has been shown to occur with unity quantum yield on sub-ps timescales. However, a poorly understood mechanism for fission along with strict energy and geometry requirements have so far limited the observation of this process to a few classes of organic materials, with only a subset of these (most notably the polyacenes) showing both efficient fission and long-lived triplets. Here, we utilize novel organic materials to investigate how the efficiency of the fission process depends on the coupling and the energetic driving force between chromophores in both intra- and intermolecular singlet fission materials. We demonstrate how the triplet yield can be accurately quantified using a combination of traditional transient spectroscopies and recently developed excited state saturable absorption techniques. These results allow us to gain mechanistic insight into the fission process and suggest general strategies for generating new materials that can undergo efficient fission.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Erik Busby, Erik Busby, Jianlong Xia, Jianlong Xia, Omer Yaffe, Omer Yaffe, Bharat Kumar, Bharat Kumar, Timothy Berkelbach, Timothy Berkelbach, Qin Wu, Qin Wu, John Miller, John Miller, Colin Nuckolls, Colin Nuckolls, Xiaoyang Zhu, Xiaoyang Zhu, David Reichman, David Reichman, Luis Campos, Luis Campos, Matthew Y. Sfeir, Matthew Y. Sfeir, "Quantifying singlet fission in novel organic materials using nonlinear optics", Proc. SPIE 9181, Light Manipulating Organic Materials and Devices, 91810A (7 October 2014); doi: 10.1117/12.2061831; https://doi.org/10.1117/12.2061831

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