Near-Infrared Absorption Composition for Visible Transparency
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Solution Overview
Problem
Existing near-infrared absorption compositions fail to achieve both excellent visible transparency and near-infrared shieldability, particularly in forming films that effectively absorb in the 750 to 830 nm range without compromising visible light transmission.
Innovation Solution
A near-infrared absorption composition comprising a compound represented by Formula (1) and a resin, where the compound has a maximum absorption wavelength in the 750 to 830 nm range and a specific absorbance ratio at 555 nm, combined with a resin such as a (meth)acrylic or epoxy resin, to form a cured film with enhanced visible transparency and near-infrared shieldability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a pyrrolopyrrole compound is used as a near-infrared absorption substance, then near-infrared shieldability is improved, but visible transparency deteriorates
Solution Approach 1:
The patent modifies the molecular structure of the pyrrolopyrrole compound by introducing specific substituents (R1a, R1b, Ar1, Ar2, R2, R3, R4-R7) to adjust the absorption spectrum. This structural parameter change shifts the maximum absorption wavelength to 750-830 nm and reduces visible light absorption, thereby improving visible transparency while maintaining near-infrared shieldability
Solution Approach 2:
The patent achieves selective wavelength absorption by designing the compound to have different absorption characteristics at different wavelengths. The compound specifically targets near-infrared wavelengths (750-830 nm) while maintaining high transparency in the visible range (400-700 nm), creating local quality differentiation in the absorption spectrum
2Object-affected harmful factors
If a compound forming association in aqueous solution is used, then near-infrared absorption capability is improved, but film formation capability deteriorates due to resin inhibition
Solution Approach 1:
The patent introduces a resin as an intermediary medium that allows the pyrrolopyrrole compound to form films effectively. The resin matrix accommodates the compound while preventing resin inhibition of association, enabling both near-infrared absorption capability and film formation capability to coexist
Solution Approach 2:
The patent creates a composite material system combining the pyrrolopyrrole compound with a resin matrix. This composite approach allows the compound to maintain its near-infrared absorption properties through association while the resin provides the necessary film-forming capability and structural integrity
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 a balance between visible light transmission and near-infrared absorption, allowing for precise waveform control and improved performance in solid-state imaging devices and infrared sensors.
Implementation Method 1
the compound has a maximum absorption wavelength in a wavelength range of 750 to 830 nm in a film
Implementation Method 2
a value obtained by dividing an absorbance at a wavelength of 555 nm by an absorbance at the maximum absorption wavelength is 0.10 or less
Data Source
AI summary
To provide a near-infrared absorption composition capable of forming a film having excellent visible transparency and near-infrared shieldability, a cured film, a near-infrared absorption filter, a solid-state imaging device, and an infrared sensor. A near-infrared absorption composition includes a compound represented Formula (1) and a resin, the compound has a maximum absorption wavelength in a wavelength range of 750 to 830 nm in a film in a case where the film is formed using the near-infrared absorption composition, and a value obtained by dividing an absorbance at a wavelength of 555 nm by an absorbance at the maximum absorption wavelength is 0.10 or less.