Journal article
Direct Observation of Aggregation-Induced Emission Mechanism.
- Guan J College of Chemistry and Molecular Engineering, Beijing National Laboratory for Molecular Sciences, Peking University, Beijing, 100871, China.
- Wei R College of Chemistry and Molecular Engineering, Beijing National Laboratory for Molecular Sciences, Peking University, Beijing, 100871, China.
- Prlj A Laboratory for Computational Molecular Design, École polytechnique fédérale de Lausanne, Lausanne, Switzerland.
- Peng J College of Chemistry and Molecular Engineering, Beijing National Laboratory for Molecular Sciences, Peking University, Beijing, 100871, China.
- Lin KH Laboratory for Computational Molecular Design, École polytechnique fédérale de Lausanne, Lausanne, Switzerland.
- Liu J College of Chemistry and Molecular Engineering, Beijing National Laboratory for Molecular Sciences, Peking University, Beijing, 100871, China.
- Han H College of Chemistry and Molecular Engineering, Beijing National Laboratory for Molecular Sciences, Peking University, Beijing, 100871, China.
- Corminboeuf C Laboratory for Computational Molecular Design, École polytechnique fédérale de Lausanne, Lausanne, Switzerland.
- Zhao D College of Chemistry and Molecular Engineering, Beijing National Laboratory for Molecular Sciences, Peking University, Beijing, 100871, China.
- Yu Z College of Chemistry and Molecular Engineering, Beijing National Laboratory for Molecular Sciences, Peking University, Beijing, 100871, China.
- Zheng J College of Chemistry and Molecular Engineering, Beijing National Laboratory for Molecular Sciences, Peking University, Beijing, 100871, China.
- 2020-05-23
Published in:
- Angewandte Chemie (International ed. in English). - 2020
English
The mechanism of aggregation-induced emission, which overcomes the common aggregation-caused quenching problem in organic optoelectronics, is revealed by monitoring the real time structural evolution and dynamics of electronic excited state with frequency and polarization resolved ultrafast UV/IR spectroscopy and theoretical calculations. The formation of Woodward-Hoffmann cyclic intermediates upon ultraviolet excitation is observed in dilute solutions of tetraphenylethylene and its derivatives but not in their respective solid. The ultrafast cyclization provides an efficient nonradiative relaxation pathway through crossing a conical intersection. Without such a reaction mechanism, the electronic excitation is preserved in the molecular solids and the molecule fluoresces efficiently, aided by the very slow intermolecular charge and energy transfers due to the well separated molecular packing arrangement. The mechanisms can be general for tuning the properties of chromophores in different phases for various important applications.
- Language
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- English
- Open access status
- closed
- Identifiers
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- DOI 10.1002/anie.202004318
- PMID 32441469
- Persistent URL
- https://sonar.ch/global/documents/197785
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