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

Yuna Kim1, Hitomi Ohmagari2, Akira Saso2

  • 1Research Institute for Electronic Science, Hokkaido University, N-20, W-10, Kita-Ku, Sapporo 001-0020, Japan.

ACS Applied Materials & Interfaces
|September 15, 2020
PubMed
Summary

This study demonstrates a simplified electrofluorochromic system using europium (Eu) helicate complexes. The reversible redox reactions of Eu ions enable efficient, switchable luminescence control in optoelectronic devices.

Keywords:
electrochemical luminescence switchingelectrofluorochromic deviceelectrofluorochromismeuropium complexionic liquidredox-active

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Luminescence

Background:

  • Electrofluorochromism typically requires additional components for luminescence quenching.
  • Controlling luminescence via redox reactions offers potential for advanced optoelectronic devices.

Purpose of the Study:

  • To develop a simplified electrofluorochromic system using europium (Eu) helicate complexes.
  • To investigate the reversible electrochemistry of Eu ions for luminescence switching.

Main Methods:

  • Synthesis of helicate complexes (EuL) with a hexadentate pyridine derivative.
  • Fabrication of a three-electrode electrochemical switching device using EuL in an ionic liquid ([BMIM][PF6]).
  • Electrochemical cycling between Eu3+ and Eu2+ states to observe luminescence changes.

Main Results:

  • A simplified electrofluorochromic system was achieved by utilizing the reversible redox chemistry of Eu ions.
  • The EuL complexes exhibited enhanced red fluorescence in [BMIM][PF6] ionic liquid.
  • Rapid luminescence quenching and restoration were observed upon electrochemical reduction (Eu2+) and oxidation (Eu3+), respectively.
  • The device demonstrated reversible spectral fluctuations within ±2 V and excellent optoelectric properties.

Conclusions:

  • The developed system offers an efficient and smart method for controlling Eu luminescence.
  • This work paves the way for novel optoelectronic devices with tunable luminescence.
  • The simplified approach overcomes limitations of traditional electrofluorochromic systems.