Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 21, Pages 6222-6226Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201501396
Keywords
nonlinear optics; pentacene; singlet fission; time-resolved spectroscopy
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Funding
- National Basic Research Program of China (MOST) [2013CB932903, 2012CB921801]
- National Science Foundation of China [91233103, 61108001, 11227406, 11321063]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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By creating two triplet excitons from one photo-excited singlet exciton, singlet fission in organic semiconductors has drawn tremendous attention for its potential applications in boosting the efficiency of solar conversion. Here, we show that this carrier-multiplication effect can also be used to dramatically improve the nonlinear optical response in organic materials. We have observed large optical nonlinearity with a magnitude of ((3)) up to 10(-9)esu in pentacene films, which is further shown to be a result of singlet fission by monitoring the temporal dynamics. The potential application of such efficient nonlinear optical response has been demonstrated with a singlet-fission-induced polarization rotation.
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