Electrofluorochromism based on the valence change of europium complexes in electrochemical devices with Prussian blue as the counter electrode

The electrofluorochromism of Eu complexes based on the valence change between Eu 3+ and Eu 2+ is demonstrated in a two-electrode electrochemical device consisting of Prussian blue (PB) as the counter electrode. This study aims to improve the electrofluorochromic (EFC) performance of luminescence swi...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2024-11, Vol.26 (46), p.288-2887
Main Authors: Yabuta, Ryoto, Kobayashi, Norihisa, Nakamura, Kazuki
Format: Article
Language:English
Subjects:
Electrodes
Europium
Luminescence
Photoluminescence
Pigments
Redox reactions
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Summary:The electrofluorochromism of Eu complexes based on the valence change between Eu 3+ and Eu 2+ is demonstrated in a two-electrode electrochemical device consisting of Prussian blue (PB) as the counter electrode. This study aims to improve the electrofluorochromic (EFC) performance of luminescence switching between Eu 3+ and Eu 2+ by enhancing the electrochemical reactivity of the EFC device. By introducing a PB film as a counter electrode in a two-electrode device, the redox reaction of Eu 3+/2+ is promoted because of charge compensation by the counter PB film. The increase in the reaction charge enables faster changes in the photoluminescence from Eu 3+ to Eu 2+ and an increase in the blue luminescence intensity from the Eu 2+ state. This approach achieves a lowered driving voltage, accelerates the electrochemical redox reaction of the Eu complex, and enhances the reversibility of the valence change of the Eu ion. Electrochemical luminescence control of Eu complexes was improved using electrochromic Prussian blue films.
ISSN:1463-9076
1463-9084
1463-9084
DOI:10.1039/d4cp03155e