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Electrofluorochromic Device Based on a Redox-Active Europium(III) Complex

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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
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 .
Type: article (author version)
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)

Submitter: キム ユナ

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