Near-Infrared Absorbing Composition Dispersion Stability
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Solution Overview
Problem
Existing near-infrared ray absorbing compositions for solid-state imaging devices face challenges with dispersion stability and moisture resistance, leading to aggregation and reduced quality in near-infrared ray cut filters, especially when no binder component is present.
Innovation Solution
A near-infrared ray absorbing composition comprising a metal ion-containing near-infrared absorber and a metal compound with specific structures, such as those represented by Formulas (I), (II), and (III), which improves dispersion stability and thermal stability by incorporating a metal alkoxide, chelate, or acylate, along with a solvent, to form a stable film with enhanced moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a copper phosphonate complex is used as a near-infrared ray absorbing material, then near-infrared ray absorbing ability is improved, but dispersion stability and moisture resistance deteriorate
Solution Approach 1:
The patent uses a composite material system consisting of a copper phosphonate complex (near-infrared absorber) combined with a specific binder resin and solvent formulation. This composite approach allows the copper complex to provide near-infrared absorption while the binder and solvent matrix maintain dispersion stability and moisture resistance, resolving the contradiction between absorption performance and compositional stability.
2Reliability
If a copper phosphonate complex is used as a near-infrared ray absorbing material, then near-infrared ray absorbing ability is improved, but moisture resistance deteriorates
Solution Approach 1:
The patent introduces a binder resin as an intermediary substance between the copper phosphonate complex and the external environment (moisture). The binder resin forms a protective matrix that encapsulates the copper complex, allowing it to maintain near-infrared absorption capability while the binder itself provides the moisture resistance, thus using an intermediary to protect the sensitive component.
3Productivity
If heat is applied to accelerate the process, then productivity is improved, but aggregation is accelerated
Solution Approach 1:
The patent modifies the chemical composition parameters of the dispersion system by selecting specific binder resins and solvents with appropriate molecular structures and properties. These parameter changes in the formulation create a more stable dispersion medium that can withstand thermal processing without causing copper complex aggregation, thus allowing heat application for productivity improvement without the harmful aggregation effect.
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 achieves low haze, excellent near-infrared ray absorption, improved dispersion stability, and thermal stability, resulting in a high-quality near-infrared ray absorbing film for solid-state imaging devices with enhanced moisture resistance and heat resistance.
Implementation Method 1
As a result of the physical or chemical interaction between the near-infrared absorber containing at least metal ions and the metal compound, it is possible to achieve a near-infrared ray absorbing composition having a low haze, excellent in near-infrared ray absorbing ability, having improved dispersion stability (moisture resistance) of the metal complex at the time of moisture incorporation, and improved thermal stability of the metal complex.
Implementation Method 2
a near-infrared ray absorbing composition comprising at least a near-infrared absorber, a metal compound, and a solvent, wherein the near-infrared absorber contains a metal ion
Data Source
AI summary
Provided is a near-infrared ray absorbing composition containing at least a near-infrared absorber, a metal compound, and a solvent, wherein the near-infrared absorber contains a metal ion, and the metal compound is a compound having a structure represented by the following Formula (I), Formula (II), or Formula (III),M(OR1)n Formula (I):Mn+(O═R2—O−)n Formula (II):(OR3)n-mMn+(−OCOR4)m, Formula (III):in the above Formulas (I), (II), and (III), M represents at least one metal element selected from the group consisting of titanium, zirconia, and aluminum; when M represents titanium or zirconia, n=4, m=1, 2, 3, or 4; when M represents aluminum, n=3, m=1, 2, or 3; R1 to R4 each independently represent an alkyl group having 1 to 30 carbon atoms, and R1 to R4 may further have a substituent.