Electrochromic Medium Composition for Neutral Gray Color Balance
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Solution Overview
Problem
The phenazine-viologen electrochromic system exhibits poor sensitivity to green light, resulting in a persistent greenish appearance in devices, distorting the observed color of objects.
Innovation Solution
An electrochromic medium composition comprising at least two anodic electrochromic materials and one cathodic electrochromic material, with specific molar ratios and absorption capabilities, including an electrochromic material capable of absorbing yellow light, and a molar ratio of blue and red light to green light materials, achieving a neutral 'gray' color state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the phenazine-viologen electrochromic system is used, then the absorption effect for red and blue colors is improved, but the sensitivity to green light deteriorates, resulting in a persistent greenish appearance
Solution Approach 1:
The patent combines phenazine (anodic), viologen (cathodic), and green light-absorbing material into a composite electrochromic system. This composite material approach allows the system to simultaneously achieve strong red and blue absorption while adding green light absorption capability, thereby resolving the green light sensitivity deficiency of the traditional phenazine-viologen system
Solution Approach 2:
The patent introduces a green light-absorbing material with specific molecular structure (containing R1-R28 substituents) to address the local deficiency in green light absorption. By optimizing the local chemical structure and properties of this component, the system achieves enhanced green light sensitivity while maintaining the overall electrochromic performance
2Illumination intensity
If the phenazine-viologen electrochromic system is used, then the color intensity is improved, but the color neutrality deteriorates, resulting in color distortion in photochromic applications
Solution Approach 1:
The patent optimizes the molar ratio parameters of the electrochromic materials to achieve color neutrality. Specifically, the phenazine to viologen molar ratio is controlled within 1:0.5 to 1:1.5, and the green light-absorbing material content is optimized, allowing the system to maintain high color intensity while achieving neutral gray appearance and eliminating color distortion
3Measurement precision
If multiple electrochromic materials are combined to achieve full spectrum coverage, then the color accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent creates a integrated composite electrochromic medium containing phenazine, viologen, and green light-absorbing material that can be processed as a single unit. This composite approach achieves full visible spectrum coverage and high color accuracy while simplifying the manufacturing process and device structure compared to separate multi-component systems
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 enables full coverage of the visible light spectrum, achieving a neutral gray color effect in electrochromic devices, enhancing color accuracy and reducing color distortion.
Implementation Method 1
Electrochromism refers to the phenomenon where the optical properties (such as reflectivity, transmittance, absorptivity, etc.) of a material undergo stable and reversible color changes under an applied electric field
Implementation Method 2
the one cathodic electrochromic material includes an electrochromic material capable of absorbing yellow light; the at least two anodic electrochromic materials include an electrochromic material capable of absorbing blue light and red light and an electrochromic material capable of absorbing green light
Data Source
AI summary
Provided are an electrochromic medium composition and a preparation method thereof, and an electrochromic device. The electrochromic medium composition includes at least two anodic electrochromic materials and one cathodic electrochromic material, where a molar ratio of the at least two anodic electrochromic materials to the one cathodic electrochromic material is in a range of 1:0.5 to 1:1.5; the one cathodic electrochromic material includes an electrochromic material capable of absorbing yellow light; and the at least two anodic electrochromic materials include an electrochromic material capable of absorbing blue light and red light and an electrochromic material capable of absorbing green light, and the electrochromic material capable of absorbing the green light is selected from compounds represented by the following structural formula.