Abstract
Photoinduced charge transfer was exploited in coumarin compounds to obtain strong fluorescence emission.
Highlights
One potential approach to addressing this challenge may involve replacing the amino and hydroxyl groups with aryl units.4556 | J
E-mail: fukuzumi@chem.eng.osaka-u.ac.jp c Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Korea d Faculty of Science and Engineering, Meijo University, ALCA and SENTAN, Japan Science and Technology Agency (JST), Nagoya, Aichi 468-0073, Japan † Electronic supplementary information (ESI) available: Fig. S1–S18 display the predicted isodensity plot of the molecular orbitals, the Lippert–Mataga plot, cyclic and differential pulse voltammograms, UV-vis absorption spectra, photoluminescence spectra obtained at 78 K, photoluminescence decay traces, transient absorption spectra, and copies of 1H and 13C NMR spectra; Tables S1 and S2 list the summary of the TD-density functional theory (DFT) calculation results and the photophysical data for poly(methyl methacrylate) (PMMA) films doped with the coumarin compounds
Aromatic units with low band gap energies may align energetically with the coumarin levels to enable this radiative process. This intramolecular charge-transfer (ICT) fluorescence is advantageous over the fluorescence produced by other coumarin derivatives bearing amino or hydroxyl groups
Summary
One potential approach to addressing this challenge may involve replacing the amino and hydroxyl groups with aryl units.4556 | J. E-mail: fukuzumi@chem.eng.osaka-u.ac.jp c Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Korea d Faculty of Science and Engineering, Meijo University, ALCA and SENTAN, Japan Science and Technology Agency (JST), Nagoya, Aichi 468-0073, Japan † Electronic supplementary information (ESI) available: Fig. S1–S18 display the predicted isodensity plot of the molecular orbitals, the Lippert–Mataga plot, cyclic and differential pulse voltammograms, UV-vis absorption spectra, photoluminescence spectra obtained at 78 K, photoluminescence decay traces, transient absorption spectra, and copies of 1H and 13C NMR spectra; Tables S1 and S2 list the summary of the TD-DFT calculation results and the photophysical data for PMMA films doped with the coumarin compounds.
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