Electrochromic Composition Using Thiadiazole for Thermal Stability

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Solution Overview

Problem

Existing electrochromic materials face challenges in achieving high reliability, thermal stability, and long lifespan, with inorganic oxides being costly to produce and organic conjugated molecules having insufficient thermal stability and short lifespans.

Innovation Solution

An electrochromic composition comprising a first oxidizable compound with a thiadiazole structure, a reducible compound, an electrolyte, and a solvent, formulated within specific concentration ranges, is used to enhance thermal stability and durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If inorganic oxide materials are used for electrochromism, then reliability and durability are improved, but production cost increases and manufacturing complexity increases

Engineering Contradiction:

ImprovelifespanVSAvoidproduction cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the chemical composition parameters by using specific ratios of oxidizable compound (0.01M-0.5M), reducible compound (0.01M-0.5M), and electrolyte (0.01M-0.5M) to achieve both high reliability and low production cost. This parameter optimization allows the organic-based composition to match inorganic oxide performance without requiring expensive vacuum coating equipment.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If inorganic oxide materials are used for electrochromism, then reliability is improved, but device complexity increases

Engineering Contradiction:

ImprovelifespanVSAvoidmanufacturing process

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the essential electrochromic function from complex inorganic oxide systems and implements it using simpler organic-based compounds. By taking out only the necessary redox-active components (oxidizable compound, reducible compound, electrolyte) and eliminating the need for vacuum coating processes, the device achieves high reliability with reduced manufacturing complexity.

Inventive Principle:

Principle #2Taking out (Extraction)

3Adaptability or versatility

If organic conjugated molecules are used for electrochromism, then color variety and color changing speed are improved, but thermal stability deteriorates and lifespan decreases

Engineering Contradiction:

Improvecolor choicesVSAvoidthermal stability

Core Design Contradiction:

Adaptability or versatilityVSTemperature

Solution Approach 1:

The patent creates a composite electrochromic system combining multiple organic compounds (oxidizable compound with triphenylamine derivative, reducible compound) and electrolyte in specific concentrations. This composite approach maintains the color variety and fast response of organic materials while improving thermal stability through the synergistic interaction of multiple components and optimized composition ratios.

Inventive Principle:

Principle #40Composite materials

4Adaptability or versatility

If organic conjugated molecules are used for electrochromism, then color variety is improved, but lifespan decreases

Engineering Contradiction:

Improvecolor choicesVSAvoidlifespan

Core Design Contradiction:

Adaptability or versatilityVSDuration of action of moving object

Solution Approach 1:

The patent optimizes concentration parameters of all components (oxidizable compound: 0.01M-0.5M, reducible compound: 0.01M-0.5M, electrolyte: 0.01M-0.5M) to extend lifespan while maintaining color variety. This parameter optimization ensures stable electrochromic cycling performance over extended periods without sacrificing the versatility of multiple color states.

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 composition exhibits improved thermal stability and durability, maintaining significant transmittance contrast before and after high-temperature cycling, outperforming traditional triphenylamine derivatives.

Implementation Method 1

Electrochromism is a phenomenon in which the optical properties (reflectivity, transmittance, absorptivity, etc.) of materials undergo stable and reversible color changes under the action of an external electric field

Methodology Applied

Scientific EffectElectrochromism: Electrochromism

Implementation Method 2

The electrochromic composition includes a first oxidizable compound with a concentration range of 0.01M-0.5M; a reducible compound with a concentration range of 0.01M-0.5M

Methodology Applied

Scientific EffectRedox reactions: Redox Reactions

Data Source

PatentUS12540274B2Electrochromic composition and electrochromic device

Publication Date: 2026.02.03 TAI YING OPTRONICS CO LTD

AI summary

An electrochromic composition is provided, including: a first oxidizable compound with a concentration range of 0.01M-0.5M; a reducible compound with a concentration range of 0.01M-0.5M; an electrolyte with a concentration range of 0.01M-0.5M; and a solvent, wherein the first oxidizable compound is represented by the following formula:wherein X1, X2 and X3 are independently the same or different substituted or unsubstituted aromatic hydrocarbon group, wherein the aromatic hydrocarbon group includes the groups represented by the following formulas: