Near-Infrared Absorbing Composition for Thin, Stable Cut Filters
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Solution Overview
Problem
Existing near infrared absorbing compositions face challenges in achieving high near infrared absorption while being thin, moisture-resistant, and heat-resistant, with phosphate ester compounds often resulting in thicker films due to trade-offs between dispersibility and absorption efficiency, and prone to hydrolysis in hot and humid environments.
Innovation Solution
A near infrared absorbing composition with a specific content ratio of copper ions and phosphate or sulfate ester compounds, where the molar ratio of copper phosphonate complex to phosphate ester complex is adjusted between 2.5 and 50, and reactive hydroxy groups are optimized to enhance absorption and dispersibility, forming a thin film with improved moisture and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the content of phosphate ester compound is increased to improve dispersibility, then dispersibility is improved, but film thickness increases
Solution Approach 1:
The patent changes the chemical structure parameters of the phosphate ester compound by introducing specific substituents (alkyl groups with 1-20 carbons, aryl groups with 6-20 carbons, and their combinations) to optimize both dispersibility and film thickness. This structural parameter optimization allows achieving good dispersibility without excessive film thickening
Solution Approach 2:
The patent creates a composite near-infrared absorbing composition containing multiple components: copper ions, phosphonic acid compounds, and specifically structured phosphate ester compounds. This composite formulation enhances dispersibility through synergistic interactions while controlling film thickness through optimized component ratios
2Length of stationary object
If the content of phosphate ester compound is suppressed to reduce film thickness, then film thickness is reduced, but dispersibility becomes insufficient
Solution Approach 1:
The patent optimizes the structural parameters of phosphate ester compounds by specifying substituent types and positions, enabling effective dispersibility at lower concentrations. The defined structural parameters allow the compound to maintain dispersing efficiency with reduced content, thus controlling film thickness
3Stability of the object's composition
If phosphate ester compound is used as dispersant, then dispersibility is improved, but moisture resistance and heat resistance deteriorate due to hydrolysis
Solution Approach 1:
The patent modifies the chemical structure of phosphate ester compounds by introducing hydrophobic substituents (alkyl and aryl groups) that reduce the compound's susceptibility to hydrolysis. This structural modification maintains dispersibility while improving resistance to moisture and heat
Solution Approach 2:
The patent uses copper ions as an intermediary that forms stable complexes with phosphonic acid compounds. This complexation protects the phosphate ester compound from hydrolysis while maintaining its dispersing function, thus improving moisture and heat resistance
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 high near infrared absorption, maintains visible light transmittance, and ensures stability in hot and humid conditions, suitable for correcting luminosity factors in imaging sensors.
Implementation Method 1
a near infrared absorber containing at least one of: (A) a first compound having a first structure represented by General Formula (I), a second compound having a second structure represented by General Formula (II), and a copper ion
Data Source
AI summary
A near infrared absorbing composition includes a near infrared absorber. The near infrared absorber contains at least one of Ingredient (A) and Ingredient (B). Ingredient (A) consists of a first compound having a first structure represented by General Formula (I), a second compound having a second structure represented by General Formula (II), and a copper ion. Ingredient (B) consists of a first copper complex in which the first compound is coordinated and a second copper complex in which the second compound is coordinated. In General Formula (I), R1 represents an alkyl group containing 1-20 carbons or an aryl group containing 6-20 carbons, and may further have a substituent. In General Formula (II), R2 represents an alkyl group containing 1-20 carbons or an aryl group containing 6-20 carbons, and may further have a substituent.