Electrochromic Polymer Complex Transparency
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Solution Overview
Problem
Electrochromic elements using materials from Patent Literature 1 can appear cloudy when decolored due to irregular pores, which affects their transparency.
Innovation Solution
A polymer complex is formed using a bis(bipyridine) derivative coordinated with specific metal ions, reducing the formation of irregular pores and enhancing transparency when decolored, comprising a compound A bound to metal ions with coordination numbers of 4 or 6, and a composition layer formed from this polymer and a counterion between transparent electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymer containing a bis(terpyridine) derivative and metal ion is used in an electrochromic element, then electrochromic properties are achieved, but the sheet appears cloudy when decolored due to irregular pores
Solution Approach 1:
The patent changes the chemical structure parameters of the ligand from bis(terpyridine) to bis(bipyridine) derivative, and controls the metal ion coordination number to be 4 or 6. This parameter change in the molecular structure leads to more regular pore distribution in the polymer sheet, improving transparency when decolored while maintaining electrochromic properties.
Solution Approach 2:
The patent creates a composite polymer material combining bis(bipyridine) derivative ligand with specific metal ions (coordination number 4 or 6). This composite structure forms a coordinated polymer with regular pore architecture, resolving the contradiction between achieving electrochromic functionality and maintaining optical clarity in the decolored state.
2Illumination intensity
If the polymer structure is modified to improve transparency, then light transmission is enhanced, but the formation of regular structure may affect electrochromic performance
Solution Approach 1:
The patent optimizes specific parameters including the metal ion coordination number (set to 4 or 6) and the bipyridine derivative structure, which simultaneously achieves regular pore formation for improved light transmission and maintains the electrochromic performance through proper metal-ligand coordination.
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 complex results in a more transparent electrochromic element when decolored, with improved light transmission and reduced scattering, suitable for use in light control and display devices.
Implementation Method 1
a polymer, wherein the polymer is comprised of a complex where a compound A represented by formula 1 below is bound to at least one specific metal ion selected from the group consisting of a first metal ion having a coordination number of 4, a second metal ion having a coordination number of 6, and a third metal ion having coordination numbers of 4 and 6
Implementation Method 2
An electrochromic element in which a sheet formed of the material described in Patent Literature 1 is arranged between a pair of transparent electrodes can easily control color development and decolorization by controlling the potential
Implementation Method 3
the sheet of the electrochromic element may look cloudy when decolored... the polymer complex results in a more transparent electrochromic element when decolored, with improved light transmission and reduced scattering
Data Source
AI summary
The present invention addresses a first problem of providing a polymer that has electrochromic characteristics, and that can form a sheet which seems more transparent when applied to an electrochromic element and is decolored. The present invention for solving the problem is a polymer obtained by forming a complex between, and binding together, compound A represented by formula 1: BP1-L1-BP2 and at least one specific metal ion selected from the group consisting of first metal ions having a coordination number of 4, second metal ions having a coordination number of 6, and third metal ions having a coordination number of 4 and 6. In the formula, L1 represents a single bond or a divalent group, and BP1 and BP2 may be identical or different from each other and each independently represent a bipyridine derivative.