Giant Amplification of Fluorescence Quenching in Photochromic Nanoparticles and Crystals
Fluorescence photoswitching properties of novel fluorescent photochromic diarylethene (DAE)-benzothiadiazole (BTD) dyads were studied in a solution, in the nanoparticle state, and in the single-crystalline state. The nanoparticles represent a state-of-the
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hotosynergetic Responses in Molecules and Molecular Aggregates
Photosynergetic Responses in Molecules and Molecular Aggregates
Hiroshi Miyasaka Kenji Matsuda Jiro Abe Tsuyoshi Kawai •
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Editors
Photosynergetic Responses in Molecules and Molecular Aggregates
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Editors Hiroshi Miyasaka Graduate School of Engineering Science Osaka University Toyonaka, Osaka, Japan
Kenji Matsuda Graduate School of Engineering Kyoto University Kyoto, Japan
Jiro Abe Department of Chemistry Aoyama Gakuin University Sagamihara, Kanagawa, Japan
Tsuyoshi Kawai Graduate School of Materials Science Nara Institute of Science and Technology Ikoma, Nara, Japan
ISBN 978-981-15-5450-6 ISBN 978-981-15-5451-3 https://doi.org/10.1007/978-981-15-5451-3
(eBook)
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Preface
Molecules in the electronic excited state take important roles in various processes. For the excited molecules in condensed phase, however, there exist general restrictions in the efficient utilization of light energies. First, higher electronically excited states of rather large molecules very rapidly relax to lower electronic states (Kasha’s rule), and some portion of the photon energy is diminished in this relaxation. Second, a large number of the molecules excited in assemblies undergo fast annihilation, and only a small number of excited state molecules can remain, leading to the loss of the number of photons absorbed in the system. In addition, the electronic state accessible by the photoabsorption is limited by the optical selection rule, and we cannot access various dark electronic excited states of molecules. These restric
