Electrochromic Covalent Organic Frameworks for Variable Transmittance
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Solution Overview
Problem
Current electrochromic devices lack innovative designs and materials that address processing costs, aesthetics, and improved functionality, particularly in terms of electrochromic materials and configurations.
Innovation Solution
The development of electrochromic devices utilizing covalent organic frameworks (COFs) as cathodic and anodic materials, which are represented by specific chemical structures, integrated with solvents and electrolyte gels between transparent substrates with conductive materials, enabling reversible optical changes in response to electrical potential differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional electrochromic materials are used, then the device can achieve basic color change functionality, but the processing costs remain high and aesthetic appeal is limited
Solution Approach 1:
The patent employs composite materials by integrating covalent organic frameworks (COFs) with electrolyte gels and conductive materials to create a multi-functional electrochromic system. The COFs provide structural organization and electrochromic activity, while the electrolyte gel enables ion transport, achieving both cost-effectiveness and enhanced aesthetic functionality through material composition rather than complex device architecture
Solution Approach 2:
The patent utilizes parameter changes by controlling the oxidation state of the COF materials through applied voltage to achieve reversible color changes. By adjusting electrical parameters (voltage, current) and chemical parameters (electrolyte composition, COF structure), the system achieves continuous variable transmittance over a wide range, providing aesthetic versatility without increasing processing complexity
2Productivity
If traditional electrochromic materials are used, then the device structure is simple, but the transmittance variability and functional performance are limited
Solution Approach 1:
The patent employs porous covalent organic frameworks that provide high surface area and organized channels for ion transport. The porous structure of the COFs enables efficient electrolyte penetration and ion diffusion, achieving rapid and complete electrochromic switching with high transmittance variability while maintaining a relatively simple device structure without requiring complex nanoscale engineering
3Reliability
If conventional electrochromic media are used, then the device can operate, but the color stability and reversibility are insufficient
Solution Approach 1:
The patent achieves improved color stability and reversibility by carefully controlling chemical parameters including the redox potentials of the COF materials, the composition and concentration of the electrolyte gel, and the pH environment. These parameter optimizations enable the electrochromic system to return to its initial state after each switching cycle, enhancing reliability without requiring complex additional components or processing steps
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 use of COFs in electrochromic devices enhances the devices' ability to achieve continuous, variable transmittance or reflectance over a wide range, improving their functionality and aesthetic appeal while reducing processing costs.
Implementation Method 1
A material having such a property, that is, a material whose optical characteristics may be reversibly changed by an electrochemical redox reaction, is called an electrochromic material
Implementation Method 2
the color of the device may be perceived as changing, as reduction of the cathodic compound at the electrode functioning as the cathode yields a composition with a molar extinction coefficient at least one wavelength in the visible or infrared range that is different from that of the cathodic compound in its zero-potential equilibrium state
Data Source
AI summary
The electrochromic device includes a first substantially transparent substrate coupled to a first transparent electrode, a second substrate coupled to a second electrode, and an electrochromic medium. The electrochromic medium includes at least one solvent and/or an electrolyte gel, at least one cathodic material, and at least one anodic material. The cathodic material can be a cathodic organic framework electroactive material and/or the anodic material can be an anodic organic framework electroactive material. At least one of the anodic and cathodic organic framework electroactive materials is electrochromic.