Electrochromic Device Color Tuning via Standard Dye
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for a convenient method to tune the optical properties of electrochromic devices prepared from conjugated polymers beyond structural modifications, particularly to achieve neutral color transitions in electrochromic device applications.
Innovation Solution
Incorporating a standard dye that does not undergo redox processes within the potential window for operation and does not react with the electrochromic material, which is disposed between or external to the electrodes, to complement or accentuate the electrochromic material in both bleached and colored states, allowing for neutral color transitions through the 'subtractive color mixing' theory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If structural modification of the conjugated polymer is used to achieve neutral color transitions, then color neutrality can be achieved, but the manufacturing complexity and cost increase
Solution Approach 1:
A standard dye is introduced as an intermediary substance between the electrochromic material and the viewer. This dye does not undergo redox processes itself but instead complements or accentuates the electrochromic material's color transitions, enabling neutral color achievement without modifying the polymer structure. The dye acts as a mediator that transforms the color output of the electrochromic material into neutral tones.
Solution Approach 2:
Instead of changing the chemical structure of the conjugated polymer, the invention changes the optical parameters by introducing a standard dye with specific absorption characteristics. By selecting a dye that absorbs at wavelengths complementary to the electrochromic material, the overall color perception is shifted to neutral tones while maintaining the electrochromic switching functionality.
2Manufacturing precision
If a standard dye is added to achieve neutral color transitions, then color neutrality is improved, but the device complexity increases
Solution Approach 1:
The standard dye is combined with the electrochromic material within the same device structure, typically incorporating the dye into the electrolyte or coating it onto the electrode. This merging allows the dye to work synergistically with the electrochromic material, achieving neutral color transitions without requiring separate neutral color generation systems.
Solution Approach 2:
The standard dye serves multiple functions: it provides neutral color tuning, enhances the electrochromic material's color transitions, and can be integrated into existing device structures without requiring fundamental design changes. The dye acts as a universal additive that can be incorporated into various electrochromic device configurations.
3Manufacturing precision
If the standard dye concentration is increased to enhance neutral color, then color neutrality is improved, but the switching speed and contrast are impacted
Solution Approach 1:
Instead of using high concentrations of standard dye that would excessively dominate the color output, the invention employs partial action by using low to moderate concentrations. This partial concentration range is sufficient to achieve neutral chromaticity while avoiding the negative impact of excessive dye that would slow switching and reduce contrast. The optimal concentration is determined by balancing color neutrality with switching performance.
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 method effectively achieves neutral color transitions by balancing the absorbance of the standard dye with the electrochromic material, resulting in devices that exhibit broad visible absorption and meet eyewear neutral chromaticity specifications with minimal impact on switching speed and contrast.
Implementation Method 1
The standard dye does not undergo redox (reduction or oxidation) processes within the potential window for operation of the electrochromic device, does not react with the electrochromic material, and optionally appropriately compliments or accentuates the electrochromic material in the bleached state, the colored state, or both
Implementation Method 2
The color switching accompanied with external bias is defined as electrochromism, where the external bias triggers either a change of molecular stack or electron transfer (redox process)
Data Source
AI summary
Disclosed is a method to color tune an electrochromic device by the use of a standard dye. By following the “subtractive color mixing” theory and selecting the appropriate standard dye to compliment or accentuate the electrochromic material, tuning of the optical and colorimetric properties of the resulting electrochromic device can be achieved. The method can also be used to prepare electrochromic devices that will switch between two neutral colors.