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Exploiting Mixed Valence Charge Transfer for Electrochromic and Electrofluorochromic Use.

Mohan Raj Anthony Raj¹, Chengzhang Yao¹, Mathieu Frémont¹

¹Laboratoire de caractérisation photophysique des matériaux conjugués, Département de Chimie, Université de Montréal, CP 6128, succ. Centre-ville, Montréal, Québec, H3C 3J7, Canada.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|July 6, 2024

Summary

This study presents an asymmetric mixed valence fluorophore with dual electrochromic and electrofluorochromic properties. This material shows tunable color and fluorescence, demonstrating potential for advanced display technologies.

Keywords:

Electrochromic device Electrofluorochromic device Fluorescence Fluorescence quantum yield Intervalence charge transfer Mixed valence charge transfer NIR absorption

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Area of Science:

Materials Science
Electrochemistry
Photophysics

Background:

Mixed valence compounds exhibit unique electronic and optical properties.
Electrochromic and electrofluorochromic materials are crucial for display and sensing applications.
Asymmetric molecular design can lead to novel functionalities.

Purpose of the Study:

To investigate an asymmetric mixed valence fluorophore for dual electrochromism and electrofluorochromism.
To correlate molecular structure with observed electro-optical properties.
To evaluate the material's performance in a device setting.

Main Methods:

Synthesis and characterization of an asymmetric mixed valence fluorophore.
Electrochemical studies including cyclic voltammetry.
Spectroscopic analysis (absorption, fluorescence) in various solvents and devices.
Device fabrication and testing for electrochromic and electrofluorochromic performance.

Main Results:

The fluorophore exhibited solvent polarity-dependent fluorescence quantum yield (Φ_fl) and emission wavelength.
Two near-simultaneous electrochemical oxidations were observed, leading to intervalence charge transfer (IVCT) and mixed valence charge transfer (MVCT).
A significant red shift to NIR absorption and a green color were achieved upon oxidation, with reversible modulation of fluorescence intensity.

Conclusions:

The asymmetric fluorophore demonstrates promising dual electrochromic and electrofluorochromic behavior.
The material's optical properties can be effectively tuned via electrochemical stimuli.
This work highlights the potential of mixed valence fluorophores in advanced optoelectronic devices.