Organic Compound Electrochromic Element Stability
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Solution Overview
Problem
Existing electrochromic (EC) materials, such as those disclosed in Japanese Patent Laid-Open No. 2020-152708, lack stability in the first reduced state, leading to unintended light absorption and instability in terms of absorbable light wavelength.
Innovation Solution
An organic compound represented by general formula (1) is introduced, which features a stable structure in the first reduced state due to a larger difference between the first and second reduction potentials, and a durable fused ring skeleton, thereby reducing unintended light absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional EC materials are used, then a variety of color tones can be displayed, but stability in the first reduced state is insufficient
Solution Approach 1:
The patent modifies the molecular structure of EC materials by introducing specific substituent groups (X1 and X2) at defined positions on the core molecular skeleton. This structural parameter change increases the energy difference between the first and second reduced states, thereby stabilizing the first reduced state while preserving the material's coloration properties. The substituent groups act as electronic modifiers that tune the redox potentials without eliminating the electrochromic effect.
2Ease of operation
If EC materials with smaller difference between first and second reduction potentials are used, then easier electrochemical reaction occurs, but unintended light absorption increases
Solution Approach 1:
The patent optimizes the molecular structure to achieve a balanced energy difference between reduction potentials. By carefully selecting and positioning substituent groups, the material maintains sufficient electrochemical reactivity (reasonable switching voltage) while preventing the second reduction from occurring at potentials that would cause unintended light absorption. This creates an operational window where the material can be efficiently switched without generating harmful optical side effects.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The organic compound achieves enhanced stability and durability in the first reduced state, reducing the likelihood of unintended light absorption and improving the overall performance of EC elements in terms of light transmittance control.
Implementation Method 1
EC materials are substances whose optical absorption properties (e.g., coloring state and light transmittance) are varied by electrochemical redox reaction
Data Source
AI summary
An organic compound represented by the following formula (1) is provided:In general formula (1), X1 and X2 are each independently selected from the group consisting of substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, and substituted or unsubstituted aralkyl groups. R1 to R8 are each independently selected from the group consisting of a hydrogen atom, a deuterium atom, halogen atoms, substituted or unsubstituted alkyl groups, substituted or unsubstituted alkoxy groups, and substituted or unsubstituted aryl groups. R11 to R14 are each independently selected from the group consisting of a hydrogen atom, substituted or unsubstituted alkyl groups, and substituted or unsubstituted aryl groups.