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Near-infrared-absorbing composition, near-infrared-absorbing film, and image sensor for solid-state imaging element
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A near-infrared and absorptive technology, which is applied in the fields of electric solid-state devices, optical components, image communication, etc., can solve problems such as obstacles and insufficient absorption characteristics, and achieve the effect of excellent absorptivity and reduced film thickness
Active Publication Date: 2021-11-05
KONICA MINOLTA INC
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[0009] However, the methods disclosed in the above-mentioned Patent Documents 1 to 4 are near-infrared-absorbing compositions mainly composed of a phosphonic acid compound, approximately one type of phosphoric acid ester compound, and copper ions. The absorption characteristics in the region are insufficient, and in order to exhibit sufficient absorption characteristics, it is necessary to add a large amount of near-infrared absorptive material. The urgent expectation of globalization has become a big obstacle
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[0223] The solvent that can be used in the preparation of the near-infrared absorbing composition of the present invention is not particularly limited, and hydrocarbon-based solvents can be exemplified, and more preferably, aliphatic hydrocarbon-based solvents, aromatic hydrocarbon-based solvents, halogen-based solvents can be exemplified. A solvent is used as a preferable example.
[0224] Examples of the aliphatic hydrocarbon-based solvent include acyclic aliphatic hydrocarbon-based solvents such as hexane and heptane, cyclic aliphatic hydrocarbon-based solvents such as cyclohexane, methanol, ethanol, n-propanol, and ethylene glycol. Alcohol-based solvents such as alcohol-based solvents, ketone-based solvents such as acetone and methyl ethyl ketone, ether-based solvents such as diethyl ether, diisopropyl ether, tetrahydrofuran, 1,4-dioxane, ethylene glycol monomethyl ether, and the like. As the aromatic hydrocarbon solvent, for example, toluene, xylene, mesitylene, cyclohexy...
Embodiment 1
[0289] "Preparation of near-infrared absorbing composition"
[0290] (Preparation of near-infrared absorbing composition 1)
[0291] 1.463 g of copper acetate (II) monohydrate (manufactured by Kanto Chemical Co., Ltd., hereinafter also abbreviated as "copper acetate") and 60 g of tetrahydrofuran (THF) were mixed and stirred for 1 hour to prepare a copper acetate solution.
[0292] Next, to the obtained copper acetate solution, 0.477 g of Exemplified Compound 78 as Compound A and 0.607 g of Exemplary Compound 78 were added as one of two types of phosphate compounds having a structure represented by the general formula (II). Compound 80 was used as a solution of another compound B and 5 g of THF, and the solution was stirred for 30 minutes to prepare a liquid A.
[0293] Next, 5 g of THF was added to 0.613 g of ethylphosphonic acid (manufactured by Tokyo Chemical Industry Co., Ltd.), which is a compound having a structure represented by the general formula (I), and the mixture ...
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Abstract
The present invention addresses the problem of providing: a near-infrared-absorbing composition that has excellent dispersion stability, visible light transmittance, and near-infrared absorption; a near-infrared-absorbing film that makes it possible to reduce film thickness; and an image sensor for a solid-state imaging element, the image sensor comprising the near-infrared-absorbing film. This near-infrared-absorbing composition is characterized by containing a near-infrared absorption agent and a solvent, the near-infrared absorption agent containing, as a component (A), a component that comprises a phosphonic acid compound that has a structure that is represented by general formula (I), at least two differently structured phosphate ester compounds or sulfonate ester compounds, and copper ions and / or, as a component (B), a component that comprises a copper complex that is obtained by means of a reaction between a phosphonic acid compound, at least two differently structured phosphate ester compounds or sulfonate ester compounds, and a copper compound.
Description
technical field [0001] The present invention relates to a near-infrared absorbing composition, a near-infrared absorbing film using the same, and an image sensor for a solid-state imaging device, and more particularly, to a near-infrared absorbing composition, and more specifically, it is excellent in dispersibility, transmittance of visible portion, and light absorption of near-infrared light The near-infrared absorbing composition, the near-infrared absorbing film capable of reducing the film thickness, and the image sensor for a solid-state imaging element provided with the near-infrared absorbing film. Background technique [0002] In recent years, CCD and CMOS image sensors, which are solid-state imaging elements for color images, have been used in video cameras, digital cameras, mobile phones with camera functions, and the like, and these solid-state imaging elements use light-receiving parts for near-infrared wavelength regions. A silicon photodiode has sensitivity to...
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