Large Optical Nonlinearity Induced by Singlet Fission in Pentacene Films |
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| Authors: | Yunlong Liu Prof. Chunfeng Zhang Rui Wang Bo Zhang Prof. Zhanao Tan Prof. Xiaoyong Wang Prof. Min Xiao |
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| Affiliation: | 1. National Laboratory of Solid State Microstructures, School of Physics & College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093 (China);2. New and Renewable Energy of Beijing Key Laboratory, School of Renewable Energy, North China Electric Power University, Beijing 102206 (China);3. National Laboratory of Solid State Microstructures, School of Physics & College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093 (China);4. Department of Physics, University of Arkansas, Fayetteville, AR 72701 (USA) |
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| Abstract: | 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 χ(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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| Keywords: | nonlinear optics pentacene singlet fission time‐resolved spectroscopy |
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