Electrochromic Polyamic Acid Material for Display Devices
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Solution Overview
Problem
Polyaniline-based electrochromic devices are rare due to their limited solubility and poor processability, which hinders their development as effective display materials.
Innovation Solution
An electrochromic polyamic acid material incorporating oligoaniline and carbazolyltriphenylamine is developed, with a specific molecular structure and preparation method that enhances solubility and processability, allowing for reversible fluorescence conversion with voltage changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyaniline materials are used for electrochromic devices, then electrochemical activity and reversible color changes are achieved, but solubility and processability deteriorate
Solution Approach 1:
The patent creates a composite material by grafting polyaniline chains onto a polyamic acid backbone. This composite structure combines the electrochromic properties of polyaniline with the excellent solubility and processability of polyamic acid, resolving the contradiction between electrochemical activity and ease of manufacture. The polyamic acid serves as a soluble matrix that accommodates the electroactive polyaniline segments.
Solution Approach 2:
The invention introduces local quality by incorporating electroactive polyaniline segments at specific intervals along the polyamic acid backbone. Rather than making the entire polymer electroactive, only localized segments exhibit electrochromic behavior while the rest of the structure maintains solubility and processability. This localized approach allows the material to exhibit both desired properties simultaneously.
2Reliability
If polyaniline-based materials are developed for display applications, then electrochromic properties are achieved, but device fabrication complexity increases due to poor processability
Solution Approach 1:
The patent changes the chemical parameters of the base material by synthesizing polyamic acid with specific structural characteristics that enhance solubility. By modifying the polymer backbone parameters (using aromatic diamines and dianhydrides with appropriate side chains), the material achieves both electrochromic functionality and improved processability for device fabrication, thereby reducing fabrication complexity.
Solution Approach 2:
The polyamic acid structure acts as an intermediary carrier that facilitates the incorporation of polyaniline segments into device architectures. This intermediary structure provides a soluble precursor that can be processed into films and devices more easily than pure polyaniline, simplifying the overall fabrication process while maintaining electrochromic properties.
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 material exhibits improved solubility in various solvents and demonstrates high electrochemical stability and reversible fluorescence properties, making it suitable for use in display devices.
Implementation Method 1
Fluorescence intensity of the electrochromic polyamic acid material undergoes reversible fluorescence conversion with a change of an applied voltage, due to a redox reaction of the oligoaniline at different voltages
Implementation Method 2
an electron/energy transfer path with the fluorescence emitting group are generated or eliminated
Implementation Method 3
The material exhibits improved solubility in various solvents
Data Source
AI summary
The present invention provides an electrochromic polyamic acid material, a preparation method thereof and a display device, wherein the molecular structure of the electrochromic polyamic acid material includes oligoaniline and carbazolyl triphenylamine. The oligoaniline serves as an electrochemically sensitive group, and the carbazolyl triphenylamine serves as a fluorescence emitting group. The electrochromic polyamic acid material is an electrically controlled fluorescent polymer. Fluorescence intensity of the electrochromic polyamic acid material undergoes reversible fluorescence conversion with a change of an applied voltage, due to a redox reaction of the oligoaniline at different voltages, resulting in an interchange between a benzene ring and an anthracene ring in a molecular structure, and an electron/energy transfer path with the fluorescence emitting group are generated or eliminated, thereby realizing the electrically controlled fluorescent properties of the electrochromic polyamic acid material.