Squarylium Near-Infrared Absorption Composition for Solubility
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Solution Overview
Problem
Existing squarylium compounds used in near-infrared absorption applications have low solvent solubility, making dispersion and application challenging in solid-state imaging devices and infrared sensors.
Innovation Solution
A near-infrared absorption composition comprising a squarylium compound represented by Formula (1) with specific structural features, including a group represented by Formula (W), which enhances solvent solubility and film flexibility, is developed, along with a resin, to create a cured film suitable for near-infrared cut filters and solid-state imaging devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional squarylium compounds are used for near-infrared absorption, then near-infrared absorption performance is achieved, but solvent solubility is poor
Solution Approach 1:
The patent modifies the molecular structure of squarylium compounds by introducing specific substituents ( Formula (W) groups with long alkyl chains, aryl groups, or heteroaryl groups) to change the solubility parameter while maintaining the near-infrared absorption capability. This structural parameter change enables the compound to dissolve in common solvents like toluene, ethyl acetate, and acetonitrile.
Solution Approach 2:
The patent creates a composite system by combining the modified squarylium compound (Formula (1)) with various resins (acrylic resin, polyester resin, epoxy resin, etc.) to form a composition that exhibits both near-infrared absorption properties and improved processability. The resin matrix provides additional solubility enhancement and film-forming capability.
2Reliability
If squarylium compounds with low solubility are used, then near-infrared absorption function is maintained, but dispersion and application become difficult
Solution Approach 1:
The patent systematically changes the molecular parameters of the squarylium compound by introducing hydrophilic substituents ( Formula (W) groups with long alkyl chains, aryl groups, or heteroaryl groups) to improve solubility in common solvents, thereby facilitating dispersion and application processes while maintaining near-infrared absorption function.
Solution Approach 2:
The patent uses resins as intermediary substances that bridge the gap between the squarylium compound and the application environment. The resin matrix provides a compatible medium for the squarylium compound, enabling easy dispersion and uniform distribution in the final product while maintaining the near-infrared absorption function.
3Reliability
If existing squarylium compounds are used, then near-infrared cut filter function is achieved, but film stability and moisture resistance are insufficient
Solution Approach 1:
The patent develops a composite material system combining the modified squarylium compound (Formula (1)) with various resins (acrylic resin, polyester resin, epoxy resin, polyurethane resin, polysulfone resin, polyether resin, polyimide resin, polyamide resin, polyacrylic resin, polyethylene resin, polypropylene resin, polyvinylidene fluoride resin, cyclic olefin resin, and polyester acrylic resin) to create films with enhanced stability and moisture resistance while maintaining near-infrared cut filter function.
Solution Approach 2:
The patent changes the chemical composition parameters of the film by incorporating the modified squarylium compound with specific substituents into a resin matrix, creating a composite film structure that provides both near-infrared absorption functionality and improved stability and moisture resistance 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 composition provides improved solvent solubility and moisture resistance, leading to enhanced performance in near-infrared absorption and film stability, addressing the limitations of low solubility in existing squarylium compounds.
Implementation Method 1
a squarylium compound or the like is known as a near-infrared absorption substance
Implementation Method 2
a near-infrared absorption composition comprising: a compound represented by Formula (1); and a resin
Data Source
AI summary
To provide a near-infrared absorption composition which contains a squarylium compound having excellent solvent solubility, a cured film which uses the near-infrared absorption composition, a near-infrared cut filter, a solid-state imaging device, an infrared sensor, and a compound. A near-infrared absorption composition includes a compound represented by the following Formula (1) and a resin. R1 and R2 each independently represent “—S1-L1-T1” or the like, R3 and R4 each independently represent a hydrogen atom or an alkyl group, X1 and X2 each independently represent an oxygen atom or —N(R5)—, R5 represents a hydrogen atom or the like, Y1 to Y4 each independently represent a substituent, p and s each independently represent an integer of 0 to 3, and q and r each independently represent an integer of 0 to 2; and S1 represents an arylene group or the like, L1 represents an alkylene group or the like, and T1 represents an alkyl group or the like.