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Electrofluorochromic Device Based on a Redox-Active Europium(III) Complex
| Title: | Electrofluorochromic Device Based on a Redox-Active Europium(III) Complex |
| Authors: | Kim, Yuna Browse this author →KAKEN DB | | Ohmagari, Hitomi Browse this author | | Saso, Akira Browse this author | | Tamaoki, Nobuyuki Browse this author →KAKEN DB | | Hasegawa, Miki Browse this author |
| Keywords: | electrofluorochromism | | europium complex | | redox-active | | ionic liquid | | electrochemical luminescence switching | | electrofluorochromic device |
| Issue Date: | 14-Oct-2020 |
| Publisher: | American Chemical Society |
| Journal Title: | ACS applied materials & interfaces |
| Volume: | 12 |
| Issue: | 41 |
| Start Page: | 46390 |
| End Page: | 46396 |
| Publisher DOI: | 10.1021/acsami.0c13765 |
| Abstract: | Electrofluorochromism owing to redox reactions on the center europium (Eu) ion in ionic liquids is examined for the helicate complexes (abbreviated as EuL) with a hexadentate pyridine derivative. Typical electrofluorochromism requires extra electroactive units complementing intra- or intermolecular energy transfer to quench fluorophores. Herein, an unprecedentedly simplified electrofluorochromic system overcoming such issues is demonstrated by utilizing reversible electrochemistry of EuL between Eu3+ and Eu2+, which accompanies large emission transition. A three-electrode electrochemical switching device is facilely prepared with an ionic liquid [BMIM] [PF6] and EuL mixture. Benefiting from the stable helical coordinated structure of the ligand in [BMW] [PF6], highly enhanced red fluorescence of EuL with small quantity (<= 1 wt %) is utilized. Rapid response and large contrast of luminescence are achieved: the emission is drastically quenched at the reduced state (Eu2+) and it is successfully restored by subsequent oxidation (Eu3+) The reversible fluctuation of excitation and emission spectra of an electrofluorochromic device is achieved in the potential window within +/- 2 V. The device affords excellent optoelectric properties in terms of well-controlled luminescence switching depending on the applied potentials and its durability. This work paves an efficient and smart way toward Eu luminescence control in optoelectronic devices. |
| Rights: | This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials & Interfaces, copyright c American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acsami.0c13765 . |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/82937 |
| Appears in Collections: | 電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: キム ユナ
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