Electrochromic Film Composition to Prevent Self-Erasing
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Solution Overview
Problem
Conventional electro-optic elements with solution-phase electroactive materials face issues with self-erasing upon removal of electric potential due to internal diffusion processes, leading to reduced stability and lifespan.
Innovation Solution
The use of cathodic and anodic components sequestered within polymer matrices, where the cathodic component is present in excess relative to the anodic component, limits the formation of less stable oxidation states, thereby enhancing the stability and longevity of the electro-optic element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solution-phase electroactive materials are used in electro-optic elements, then the device can achieve electrochromic functionality, but the materials undergo internal diffusion processes that cause self-erasing and reduce stability
Solution Approach 1:
The patent changes the physical state of the electroactive materials from solution-phase to solid-state by incorporating them into polymer matrices. This parameter change eliminates internal diffusion processes while maintaining electrochromic functionality, thereby resolving the contradiction between achieving electrochromic effect and maintaining compositional stability.
Solution Approach 2:
The patent uses composite materials by combining electroactive materials with polymer matrices to form solid-state electrochromic films. This composite structure prevents the internal diffusion that occurs in solution-phase materials while preserving the electrochromic properties, thus improving reliability without sacrificing functionality.
2Duration of action of stationary object
If equal amounts of cathodic and anodic components are used, then charge balance is achieved, but less stable oxidation states form and reduce device lifespan
Solution Approach 1:
The patent introduces asymmetry in the stoichiometric ratios of cathodic and anodic components within the polymer matrices. By using non-equal amounts of these components, the system prevents the formation of less stable oxidation states that would otherwise form with equal ratios, thereby extending device lifespan while maintaining charge balance through the excess component.
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
This configuration significantly reduces color change over time, extending the lifespan of electrochromic devices by limiting the formation of less stable oxidation states, thus maintaining the transparent state effectively.
Implementation Method 1
At least one of the first electroactive film and the second electroactive film is capable of reversibly attenuating transmittance of light having a wavelength within a predetermined wavelength range
Implementation Method 2
The first electroactive component can include a first oxidation state and at least a second oxidation state
Data Source
AI summary
An electro-optic element includes a first electroactive film including a first electroactive component sequestered adjacent to a first electrically conductive layer and a second electroactive film including a second electroactive component sequestered adjacent to a second electrically conductive layer. At least one of the first electroactive film and the second electroactive film is capable of reversibly attenuating transmittance of light having a wavelength within a predetermined wavelength range. The first electroactive component can include a first oxidation state and at least a second oxidation state. An amount of the first electroactive component relative to the second electroactive component can be configured to limit formation of the second oxidation state of the first electroactive component.