Soluble Electrochromic Polymers for High Optical Contrast
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Solution Overview
Problem
Current technologies face challenges in synthesizing soluble, neutral state green conjugated polymers with high electrochromic contrasts and fast switching times, particularly those that can transition to a transmissive state upon oxidation, due to the complexity of achieving the required absorption spectrum and solubility for integration into devices.
Innovation Solution
A conjugated polymer is developed with substituted dioxyheterocycle donor groups coupled to an electron-poor aromatic acceptor group, allowing absorption in the visible spectrum in the neutral state but becoming transmissive in the oxidized state, with specific absorption bands and solubility in various solvents for easy processing into films or coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional electrochromic polymers are synthesized to achieve green color in neutral state, then optical contrast is improved, but solubility and processability deteriorate
Solution Approach 1:
The patent introduces solubilizing side chains (alkyl, alkoxy, aryl groups) at specific positions on the polymer backbone while maintaining the conjugated core structure responsible for electrochromic properties. This localized modification allows the polymer to be soluble in common solvents without compromising its optical contrast performance.
Solution Approach 2:
The patent creates composite polymer structures combining electroactive conjugated backbone segments with solubilizing side chain segments. This composite approach integrates the functional requirements (electrochromism) with processing requirements (solubility) in a single material system.
2Illumination intensity
If complex absorption spectrum is designed to achieve green color, then electrochromic contrast is improved, but synthesis complexity increases
Solution Approach 1:
The patent achieves green color by precisely controlling the absorption spectrum parameters through selection of specific donor-acceptor combinations and side chain structures. By adjusting molecular weight, side chain length, and aromatic group substitution patterns, the absorption maxima are tuned to produce green appearance with two distinct bands.
Solution Approach 2:
The patent extracts the essential functional requirements (electron donation and acceptance capabilities) and implements them through modular donor-acceptor building blocks. This simplifies synthesis by using standardized repeating units that can be assembled through conventional polymerization methods.
3Speed
If fast switching time is achieved through optimized polymer structure, then response speed is improved, but manufacturing difficulty increases
Solution Approach 1:
The patent segments the polymer into repeating units with optimized conjugated backbone structures that facilitate rapid electron delocalization during redox switching. The modular repeating units maintain fast switching kinetics while being amenable to standard polymerization techniques.
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 polymer achieves high optical contrast, efficient electrochemical switching, and solubility, enabling its integration into electrochromic devices with improved transmissivity and processing capabilities, suitable for applications like solar cells and displays.
Implementation Method 1
The conjugated polymer absorbs radiation within a first band of the visible spectrum and a second band of the visible spectrum when in a neutral state
Implementation Method 2
Polymeric electrochromics capable of a fast and reversible color change upon electrochemical oxidation and reduction
Data Source
AI summary
Green to transmissive soluble electrochromic polymers are conjugated polymers having a plurality of repeating units where repeating units are a plurality of substituted dioxyheterocycle based donor groups coupled to an acceptor group. The conjugated polymer absorbs radiation within a first band of the visible spectrum and a second band of the visible spectrum when in a neutral state resulting in a green color and is transmissive when in an oxidized state. The polymers are soluble allowing processing of films and coatings from solution.