Infrared Absorber Composition for Stable Defect-Suppressed Filter Films
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Solution Overview
Problem
Existing infrared-absorbing compositions for infrared cut filters in solid-state imaging elements suffer from poor spectral characteristics, temporal stability, and film defects.
Innovation Solution
A composition comprising a coloring agent represented by Formula (1) with specific substituents and a curable compound, which includes an aliphatic hydrocarbon group and asymmetric structure to enhance visible transparency and reduce crystallinity, thereby improving spectral characteristics and stability while suppressing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional infrared-absorbing coloring agents are used, then infrared absorption is achieved, but visible transparency is poor
Solution Approach 1:
The patent introduces specific substituent groups (R1-R4, R11-R15, Y1-Y2) at different positions of the pyrrolopyrrole core structure to achieve localized optimization: R1-R4 control infrared absorption, while R11-R15 and Y1-Y2 are specifically designed to enhance visible transparency without compromising infrared absorption, allowing simultaneous satisfaction of both requirements
Solution Approach 2:
The patent systematically varies molecular parameters including the types of substituents (cyano, aryl, heteroaryl groups), their positions, and the aliphatic hydrocarbon group R5 to optimize the balance between infrared absorption and visible transparency, achieving spectral characteristics that satisfy both requirements
2Reliability
If existing composition formulations are used, then film formation is achieved, but temporal stability is poor
Solution Approach 1:
The patent introduces asymmetric substituent patterns on the pyrrolopyrrole core, where substituents are strategically placed at specific positions (R11-R15) to create molecular asymmetry that prevents crystallization and aggregation, thereby improving temporal stability and reducing film defects
Solution Approach 2:
The patent combines the pyrrolopyrrole coloring agent with a curable compound to form a composite composition that provides both the infrared absorption function and the structural stability needed for defect-free film formation, leveraging the synergistic effects of the composite system
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 enables the formation of films with excellent spectral characteristics, high transparency, and improved temporal stability with reduced defects, suitable for optical filters, solid-state imaging elements, and infrared sensors.
Implementation Method 1
a coloring agent represented by Formula (1)... an infrared-absorbing coloring agent... has a maximal absorption wavelength at a wavelength of 650 nm or more
Data Source
AI summary
Provided is a composition which has excellent temporal stability and excellent spectral characteristics, and with which a film with suppressed defects can be formed. The composition includes a coloring agent represented by Formula (1) and a curable compound, in which R1 to R4 each independently represent a substituent, R5 represents an aliphatic hydrocarbon group, R11 to R15 each independently represent a hydrogen atom or a substituent, and Y1 and Y2 each independently represent a hydrogen atom or a substituent. However, at least one of R11, R12, R13, or R14 is a substituent or each of R11 to R15 is a hydrogen atom.