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Large optical nonlinearity induced by singlet fission in pentacene films
Yunlong Liu1, Chunfeng Zhang2, Rui Wang1
1National 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).
Angewandte Chemie (International Ed. in English)
|April 8, 2015
Summary
Singlet fission in organic semiconductors enables two triplet excitons from one singlet exciton, boosting solar conversion efficiency. This process also significantly enhances nonlinear optical responses in materials like pentacene films.
Area of Science:
- Organic semiconductors
- Photophysics
- Nonlinear optics
Background:
- Singlet fission (SF) generates multiple excitons from a single photon, enhancing solar cell efficiency.
- Organic semiconductors offer tunable properties for advanced optoelectronic applications.
Purpose of the Study:
- To investigate the potential of singlet fission to improve nonlinear optical (NLO) responses in organic materials.
- To demonstrate SF-induced carrier multiplication for enhanced NLO effects.
Main Methods:
- Fabrication and characterization of pentacene films.
- Measurement of nonlinear optical properties, specifically third-order susceptibility (χ((3))).
- Time-resolved spectroscopy to monitor singlet fission dynamics.
Main Results:
- Observed large optical nonlinearity (χ((3)) up to 10(-9) esu) in pentacene films.
- Confirmed singlet fission as the mechanism responsible for the enhanced NLO response through temporal dynamics.
- Demonstrated SF-induced polarization rotation as a potential application.
Conclusions:
- Singlet fission significantly enhances nonlinear optical responses in organic semiconductors.
- Pentacene films exhibit promising NLO properties due to SF.
- SF is a viable strategy for developing advanced organic nonlinear optical materials.
