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Proceedings Paper

Quantifying singlet fission in novel organic materials using nonlinear optics
Author(s): Erik Busby; Jianlong Xia; Omer Yaffe; Bharat Kumar; Timothy Berkelbach; Qin Wu; John Miller; Colin Nuckolls; Xiaoyang Zhu; David Reichman; Luis Campos; Matthew Y. Sfeir
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Paper Abstract

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.

Paper Details

Date Published: 7 October 2014
PDF: 7 pages
Proc. SPIE 9181, Light Manipulating Organic Materials and Devices, 91810A (7 October 2014); doi: 10.1117/12.2061831
Show Author Affiliations
Erik Busby, Brookhaven National Lab. (United States)
Columbia Univ. (United States)
Jianlong Xia, Columbia Univ. (United States)
Omer Yaffe, Columbia Univ. (United States)
Bharat Kumar, Columbia Univ. (United States)
Timothy Berkelbach, Columbia Univ. (United States)
Qin Wu, Brookhaven National Lab. (United States)
John Miller, Brookhaven National Lab. (United States)
Colin Nuckolls, Columbia Univ. (United States)
Xiaoyang Zhu, Columbia Univ. (United States)
David Reichman, Columbia Univ. (United States)
Luis Campos, Columbia Univ. (United States)
Matthew Y. Sfeir, Brookhaven National Lab. (United States)


Published in SPIE Proceedings Vol. 9181:
Light Manipulating Organic Materials and Devices
Jean-Michel Nunzi, Editor(s)

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