Electrochromic Compound Composition for Neutral Color Switching

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Solution Overview

Problem

Existing electrochromic compositions face challenges in achieving a wide range of colors, avoiding the chameleon effect, and providing high molar absorptivity while ensuring long-term stability and solubility, particularly for ophthalmic applications.

Innovation Solution

A family of electrochromic compounds comprising a 5-membered heterocycle with sulfur, selenium, or oxygen atoms, featuring specific structural characteristics that enhance molar absorptivity and allow for intense coloration when oxidized, thereby reducing dye concentration and improving optical devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a combination of different electrochromic compounds is used to achieve desired color, then color variety is improved, but compatibility between compounds becomes more difficult to ensure

Engineering Contradiction:

Improvecolor varietyVSAvoidcompound compatibility

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent divides the electrochromic system into separate functional components: oxidizing electrochromic compounds (first family) and reducing electrochromic compounds (second family), each with defined spectral characteristics. This segmentation allows independent optimization of each compound family while maintaining overall system compatibility through controlled spectral overlap.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent systematically varies molecular parameters (substituents, core structures, conjugation length) within each compound family to tune absorption spectra, oxidation potentials, and reduction potentials. This enables precise control over coloring ranges and simultaneous activation while maintaining compound compatibility.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If oxidizing and reducing electrochromic compounds are combined to achieve neutral colors, then color range is improved, but the chameleon effect occurs during activation

Engineering Contradiction:

Improveneutral color rangeVSAvoidchameleon effect

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent designs the oxidizing and reducing electrochromic compounds to have matched oxidation and reduction potentials, creating an equipotential system where both compounds activate simultaneously at the same voltage threshold. This eliminates the sequential activation that causes the chameleon effect, producing smooth transitions to neutral colors.

Inventive Principle:

Principle #12Equipotentiality

Solution Approach 2:

The patent specifically selects compound pairs where the spectral characteristics are complementary: the absorption bands of the oxidizing compound family and reducing compound family are positioned to overlap or adjacent in the visible spectrum, ensuring that when both are activated, they produce neutral colors (brown, gray, green-gray) without intermediate color stages.

Inventive Principle:

Principle #32Color changes

3Illumination intensity

If high molar absorptivity is achieved through increased dye concentration, then absorption intensity is improved, but solubility and stability are compromised

Engineering Contradiction:

Improveabsorption intensityVSAvoidsolubility and stability

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent optimizes molecular parameters including introducing solubilizing substituents (alkoxy, hydroxyl, carboxyl groups), adjusting core structure rigidity, and controlling molecular weight to achieve high molar absorptivity (ε > 10,000 L·mol⁻¹·cm⁻¹) while maintaining excellent solubility in conventional solvents and long-term stability in the presence of oxygen.

Inventive Principle:

Principle #35Parameter changes

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 compounds provide superior eye protection, visual aid, and contrast enhancement by minimizing dye concentration and ensuring simultaneous color change without the chameleon effect, while maintaining stability and solubility.

Implementation Method 1

Electrochromism is a well-known physical phenomenon which is observed with certain classes of chemical compounds that reversibly change color when a voltage is applied to them. The material undergoes reversible changes in optical properties by oxidation and reduction.

Methodology Applied

Scientific EffectElectrochromism: Electrochromism

Implementation Method 2

electrochromic compounds need not only to show good electrochromic properties such as high absorption of the visible light in the colored state, low absorption of visible radiations in the bleached state

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentEP4474446B1Electrochromic compounds, compositions and devices comprising the same

Publication Date: 2025.12.17 ESSILOR INTERNATIONAL(COMPAGNIE GENERALE D OPTIQUE)

AI summary

A family of electrochromic compounds of formula (I) comprising a thiophene, selenophene or furan ring is herein disclosed, as well as electrochromic compositions and devices comprising at least one of said electrochromic compounds of formula (I).