Near-Infrared Absorbing Filter Composition for Visible Transmittance
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Solution Overview
Problem
Existing near-infrared absorbing filters for solid-state imaging elements have limitations in achieving both high transmittance in the visible light region and absorptivity in the near-infrared region, while also requiring improved heat and light resistance.
Innovation Solution
A near-infrared absorbing composition containing a combination of squarylium or cyanine dyes with specific structures, along with a phosphonic acid and copper ion or copper phosphonate complex, which enhances absorption in the near-infrared range without compromising visible light transmittance and provides improved heat and light resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If squarylium dyes or cyanine dyes are used to achieve transmittance in visible light region, then visible light transmittance is improved, but near-infrared absorption performance deteriorates
Solution Approach 1:
The patent combines squarylium dyes or cyanine dyes (for visible light transmittance) with copper phosphonate complexes (for near-infrared absorption) to create a composite filter material that achieves both visible light transmittance and near-infrared absorption performance simultaneously
Solution Approach 2:
The patent optimizes the concentration ratios of dye components and copper phosphonate complexes, as well as adjusting the chemical structure parameters of the dyes, to achieve the desired balance between visible light transmittance and near-infrared absorption characteristics
2Quantity of substance
If conventional near-infrared absorbing filters are used to achieve absorption in near-infrared region, then near-infrared absorption is improved, but heat resistance and light resistance deteriorate
Solution Approach 1:
The patent uses copper phosphonate complexes which provide superior heat and light resistance compared to conventional organic dyes alone, while maintaining near-infrared absorption performance through the synergistic combination with squarylium or cyanine dyes
Solution Approach 2:
The patent assigns different functional roles to different components: squarylium/cyanine dyes provide visible light transmittance and contribute to near-infrared absorption, while copper phosphonate complexes provide structural stability, heat resistance, and additional near-infrared absorption, with each component optimized for its specific function
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 solution achieves balanced transmittance and absorptivity, ensuring excellent heat and light resistance, thereby enhancing the performance of near-infrared absorbing filters for solid-state imaging elements.
Implementation Method 1
at least one of a squarylium dye (A) or a cyanine dye (B) each having an absorption maximum in a range of 680 to 740 nm, and a cyanine dye (C) having an absorption maximum at 760 nm or higher
Implementation Method 2
optical materials using specific absorption characteristics of copper ions have been studied
Data Source
AI summary
A near-infrared absorbing composition includes: an organic dye; and a metal compound. The organic dye includes: at least one of a squarylium dye (A) or a cyanine dye (B) each having an absorption maximum in a range of 680 to 740 nm; and a cyanine dye (C) having an absorption maximum at 760 nm or higher. The metal compound includes at least a phosphonic acid and a copper ion, or a copper phosphonate complex formed from a phosphonic acid and a copper ion.