JP2020172614A - Dye composition, film, optical filter, solid state image sensor, image display device and infrared sensor - Google Patents

Abstract

To provide a dye composition, a film, an optical filter, a solid state image sensor, an image display device, and an infrared sensor that achieve balanced blocking in the whole region on the near-infrared short wavelength side, and allow the passage of light in the visible region.SOLUTION: A dye composition is a coloring composition containing a squarylium dye, the squarylium dye being a mixture containing three or more squarylium compounds differing in maximum absorption wavelength by 50 nm or more in a wavelength range of 650-900 nm.SELECTED DRAWING: None

Description

The present invention relates to a dye composition, a film, an optical filter, a solid-state image sensor, an image display device, and an infrared sensor.

CCD (charge coupling element) and CMOS (complementary metal oxide semiconductor), which are solid-state image sensors for color images, are used in video cameras, digital still cameras, mobile phones with camera functions, and the like. These solid-state image sensors use silicon photodiodes that are sensitive to infrared rays in their light-receiving parts. Therefore, in the solid-state image sensor, the near-infrared cut filter may be used to correct the luminosity factor. The near-infrared cut filter is manufactured using, for example, a composition containing an infrared absorber.

As the infrared absorber, a dithiolate-based metal complex, a squarylium-based compound, and the like are known (see, for example, Patent Documents 1 and 2).

International Publication No. 2016/118277 International Publication No. 2017/10423

The infrared cut filter is required to have shielding properties in the short wavelength side (wavelength 650 to 900 nm) of the near infrared region and transparency in the visible region. Particularly in recent years, it has been required to shield the entire region on the short wavelength side of the near infrared in a well-balanced manner.
As a result of examination by the present inventors, the dye composition described in Patent Document 1 has insufficient transparency in the visible region, while the dye composition described in Patent Document 2 is on the short wavelength side of the near infrared. It was found that only part of the area could be shielded.
Therefore, the present invention provides a dye composition, a film, an optical filter, a solid-state image sensor, an image display device, and a dye composition that shields the entire region on the short wavelength side of the near infrared in a well-balanced manner and transmits light in the visible region. It is an object of the present invention to provide an infrared sensor.

As a result of diligent studies to solve the above problems, the present inventors have found that the above problems can be solved by using three or more specific squarylium compounds as the squarylium dye, and complete the present invention. It came to. That is, the gist of the present invention is as follows.

[1] A dye composition containing a squarylium-based dye.
A dye composition, wherein the squarylium-based dye is a mixture containing three or more kinds of squarylium-based compounds having different maximum absorption wavelengths of 50 nm or more within a wavelength range of 650 to 900 nm.
[2] The mixture is a squarylium-based compound (a1) having a maximum absorption wavelength in the range of 650 to 740 nm, a squarylium-based compound (a2) having a maximum absorption wavelength in the range of 740 to 830 nm, and 830-900 nm. The dye composition according to [1], which contains a squarylium-based compound (a3) having a maximum absorption wavelength within the range.
[3] The dye composition according to [1] or [2], which further contains a binder resin.

[4] A film formed by using the dye composition according to any one of [1] to [3].
[5] An optical filter having the film according to [4].
[6] A solid-state image sensor having the film according to [4].
[7] An image display device having the film according to [4].
[8] An infrared sensor having the film according to [4].

According to the present invention, a dye composition, a film, an optical filter, a solid-state image sensor, an image display device, which shields the entire region on the short wavelength side of the near infrared in a well-balanced manner and transmits light in the visible region. And infrared sensors can be provided.

FIG. 1 is a transmittance spectrum of the dye filter of the example.

Hereinafter, embodiments of the present invention will be specifically described, but the present invention is not limited to the following embodiments, and can be variously modified and implemented within the scope of the gist thereof.
In the present invention, "(meth) acrylic" means "acrylic and / or methacrylic", and the same applies to "(meth) acrylate" and "(meth) acryloyl".
Further, in the present invention, the "total solid content" means all the components other than the solvent contained in the dye composition.
Further, in the present invention, the "weight average molecular weight" refers to the polystyrene-equivalent weight average molecular weight (Mw) obtained by GPC (gel permeation chromatography).

[1] Dye Composition The dye composition of the present invention is a mixture containing a squarylium-based dye, and the squarylium-based dye contains three or more types of squarylium compounds having different maximum absorption wavelengths of 50 nm or more within a wavelength range of 650 to 900 nm. Is. Further, the dye composition of the present invention may contain other components in addition to the squarylium-based dye, if necessary. Examples of other components include binder resins, solvents and the like.

[1-1] Squalylium-based dye The squarylium-based dye contained in the dye composition of the present invention is a mixture containing three or more kinds of squarylium-based compounds having different maximum absorption wavelengths of 50 nm or more within a wavelength range of 650 to 900 nm. As described above, it is considered that the transmittance in the region of 650 to 900 nm can be effectively blocked by containing three or more kinds of squarylium compounds having different maximum absorption wavelengths of 50 nm or more.
Assuming that these squalylium-based compounds have a short maximum absorption wavelength, squalylium-based compounds (1), squalylium-based compounds (2), squalylium-based compounds (3), and so on, the squalylium-based compounds (2) The maximum absorption wavelength is 50 nm or more longer than the maximum absorption wavelength of the squarylium compound (1), and similarly, the maximum absorption wavelength of the squarylium compound (3) is 50 nm longer than the maximum absorption wavelength of the squarylium compound (2). This is a long wavelength.

The maximum absorption wavelength of the squarylium compound is not particularly limited as long as it is within the wavelength range of 650 to 900 nm, but is preferably 670 nm or more, more preferably 680 nm or more, further preferably 700 nm or more, and preferably 890 nm or less, preferably 870 nm or less. Is more preferable, 850 nm or less is further preferable, and 830 nm or less is particularly preferable. When it is set to the lower limit value or more, the transmittance in the vicinity of 400 to 650 nm tends to be improved, and when it is set to the upper limit value or less, the transmittance tends to be effectively reduced in the range up to 900 nm.

The maximum absorption wavelengths of the three or more types of squarylium compounds contained in the squarylium dye are not particularly limited as long as they differ by 50 nm or more, but are preferably 55 nm or more, and preferably 60 nm or more. Is more preferable, and it is more preferable that the difference is 65 nm or more, and usually 70 nm or less. By setting the value to the lower limit or more, it tends to be possible to cut off the region on the short wavelength side of the near infrared without interruption. The maximum absorption wavelength of the squarylium-based compound can be calculated from the absorption spectrum measured by preparing a solution dissolved in a solvent such as tetrahydrofuran. It is preferable to adopt the detailed conditions described in the examples.

The three or more types of squarylium compounds contained in this squarylium dye are not particularly limited, but from the viewpoint of effectively reducing the transmittance in the near infrared region without reducing the transmittance in the visible region, 650 to A squarylium compound (a1) having a maximum absorption wavelength in the range of 740 nm, a squarylium compound (a2) having a maximum absorption wavelength in the range of 740 to 830 nm, and a squarylium compound having a maximum absorption wavelength in the range of 830 to 900 nm. It preferably contains the system compound (a3).

[1-1-1] Squalylium-based compound (a1)
The squarylium compound (a1) has a maximum absorption wavelength in the range of 650 to 740 nm. The maximum absorption wavelength is not particularly limited as long as it is within the range of 650 to 740 nm, but is preferably 670 nm or more, more preferably 680 nm or more, further preferably 700 nm or more, still preferably 725 nm or less, more preferably 720 nm or less, and 710 nm or less. Is even more preferable. When it is set to the lower limit value or more, the decrease in the transmittance in the visible region up to 650 nm tends to be suppressed, and when it is set to the upper limit value or less, the transmittance on the long wavelength side from 700 nm can be effectively blocked. Tend.

The full width at half maximum of the absorption maximum of the squalylium compound (a1) is not particularly limited, but is preferably 25 nm or more, more preferably 27 nm or more, further preferably 28 nm or more, still preferably 35 nm or less, and more preferably 33 nm or less. It is more preferably 31 nm or less. By setting the value to the lower limit value or more, the type of the squarylium-based compound portion used in combination tends to be minimized, and by setting the value to the upper limit value or less, the g absorption coefficient of the squarylium-based compound tends to be improved.
As the squarylium-based compound (a1), those described in JP-A-2001-89307 and those commercially available from Oji Chemical Research Institute and Tokyo Chemical Industry can be used.
The squarylium-based compound (a1) may be one kind of compound or a mixture of two or more kinds.

[1-1-2] Squalylium-based compound (a2)
The squarylium compound (a2) has a maximum absorption wavelength in the range of 740 to 830 nm. The maximum absorption wavelength is not particularly limited as long as it is within the range of 740 to 830 nm, but is preferably 750 nm or more, more preferably 760 nm or more, further preferably 770 nm or more, still preferably 790 nm or less, more preferably 785 nm or less, and more preferably 780 nm or less. Is even more preferable. When it is set to the lower limit value or more, the transmittance on the long wavelength side from 700 nm tends to be interrupted together with the squalylium compound (a1), and when it is set to the upper limit value or less, the squalylium compound (a1) There is a tendency to improve the effect of blocking the transmittance in the wavelength region between a1) and.

The full width at half maximum of the absorption maximum of the squalylium compound (a2) is not particularly limited, but is preferably 25 nm or more, more preferably 27 nm or more, further preferably 28 nm or more, still preferably 35 nm or less, and more preferably 33 nm or less. It is more preferably 31 nm or less. By setting the value to the lower limit value or more, the types of the squarylium compound used in combination tend to be minimized, and by setting the value to the upper limit value or less, the g absorption coefficient of the squarylium compound tends to be improved.
As the squarylium-based compound (a2), those described in JP-A-2001-89307 and those commercially available from Oji Chemical Research Institute and Tokyo Chemical Industry can be used.
The squarylium-based compound (a2) may be one kind of compound or a mixture of two or more kinds.

[1-1-3] Squalylium-based compound (a3)
The squarylium compound (a3) has a maximum absorption wavelength in the range of 830 to 900 nm. The maximum absorption wavelength is not particularly limited as long as it is within the range of 830 to 900 nm, but is preferably 840 nm or more, more preferably 850 nm or more, further preferably 855 nm or more, and preferably 890 nm or less, more preferably 870 nm or less, and 865 nm or less. Is more preferable, and 860 nm or less is particularly preferable. When it is set to the lower limit value or more, the transmittance on the long wavelength side from 700 nm tends to be interrupted together with the squarylium compounds (a1) and (a2), and when it is set to the upper limit value or less, the transmittance is described. There is a tendency that the effect of blocking the transmittance in the wavelength region between the squarylium compound (a2) and the compound (a2) can be improved.

The full width at half maximum of the absorption maximum of the squarylium compound (a3) is not particularly limited, but is preferably 25 nm or more, more preferably 27 nm or more, further preferably 28 nm or more, still preferably 35 nm or less, and more preferably 33 nm or less. It is more preferably 31 nm or less. By setting the value to the lower limit value or more, the types of the squarylium compound used in combination tend to be minimized, and by setting the value to the upper limit value or less, the g absorption coefficient of the squarylium compound tends to be improved.
As the squarylium-based compound (a3), those described in JP-A-2001-89307 and those commercially available from Oji Chemical Research Institute and the like can be used.
The squarylium-based compound (a3) may be one kind of compound or a mixture of two or more kinds.

When this squarylium-based dye contains a squarylium-based compound (a1), a squarylium-based compound (a2), and a squarylium-based compound (a3), the content ratio of the squarylium-based compound (a1) is not particularly limited, but in the squarylium-based dye. In addition, 10% by mass or more is preferable, 12% by mass or more is more preferable, 15% by mass or more is further preferable, 30% by mass or less is more preferable, 25% by mass or less is more preferable, and 20% by mass or less is further preferable. When it is set to the lower limit value or more, the spectral shape tends to change sharply in the vicinity of the wavelength of 680 nm, and when it is set to the upper limit value or less, the visible light transmittance tends to be kept high.

When this squarylium-based dye contains a squarylium-based compound (a1), a squarylium-based compound (a2), and a squarylium-based compound (a3), the content ratio of the squarylium-based compound (a2) is not particularly limited, but in the squarylium-based dye. In addition, 12% by mass or more is preferable, 15% by mass or more is more preferable, 25% by mass or more is further preferable, 30% by mass or more is particularly preferable, 50% by mass or less is preferable, and 45% by mass or less is more preferable. It is more preferably 40% by mass or less. When it is set to the lower limit value or more, the spectral shape tends to change sharply in the vicinity of the wavelength of 740 nm, and when it is set to the upper limit value or less, the visible light transmittance tends to be kept high.

When this squarylium-based dye contains a squarylium-based compound (a1), a squarylium-based compound (a2), and a squarylium-based compound (a3), the content ratio of the squarylium-based compound (a3) is not particularly limited, but in the squarylium-based dye. In addition, 10% by mass or more is preferable, 20% by mass or more is more preferable, 30% by mass or more is further preferable, 40% by mass or more is particularly preferable, 60% by mass or less is preferable, and 55% by mass or less is more preferable. It is more preferably 50% by mass or less. When it is set to the lower limit value or more, the spectral shape tends to change sharply in the vicinity of the wavelength of 830 nm, and when it is set to the upper limit value or less, the visible light transmittance tends to be kept high.

The content ratio of the squarylium-based dye in the dye composition is not particularly limited, but is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, still more preferably 0.3% by mass or more in the total solid content. Further, 10% by mass or less is preferable, 5% by mass or less is more preferable, and 1% by mass or less is further preferable. When it is set to the lower limit value or more, the reliability tends to be improved, and when it is set to the upper limit value or less, dye precipitation or the like tends to be less likely to occur.

[1-2] Binder Resin The dye composition of the present invention may further contain a binder resin. The binder resin is not particularly limited, and examples thereof include resins such as (meth) acrylic resin (PMMA and the like), polyamide resin, polyurethane resin, polyolefin resin and polycarbonate resin.
When the dye composition of the present invention contains a binder resin, the content ratio thereof is not particularly limited, but 90% by mass or more is preferable, 95% by mass or more is more preferable, and 99% by mass or more is further preferable in the total solid content. Further, 99.99% by mass or less is preferable, 99.9% by mass or less is more preferable, and 99.5% by mass or less is further preferable. When it is at least the lower limit value, the film forming property tends to be improved, and when it is at least the upper limit value, the reliability tends to be improved.

[1-3] Solvent The dye composition of the present invention may further contain a solvent. The solvent is not particularly limited, but alcans such as butane, pentane, hexane, heptane, and octane; cycloalcans such as cyclopentane, cyclohexane, cycloheptan, and cyclooctane; ethanol, propanol, butanol, and amyl. Alcohols such as alcohol, hexanol, heptanol, octanol, decanol, undecanol, diacetone alcohol, furfuryl alcohol; cellosolves such as methylserosolve, ethylserosolve, butylcellosolve, methylserosolve acetate, ethylserosolve acetate; Propylene glycols such as glycol monoethyl ether, propylene glycol monobutyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monobutyl ether acetate, dipropylene glycol dimethyl ether; acetone, methyl amyl ketone, cyclohexanone, acetphenone, etc. Ketones; ethers such as dioxane and tetrahydrofuran; butyl acetate, amyl acetate, ethyl butyrate, butyl butyrate, diethyl oxalate, ethyl pyruvate, ethyl-2-hydroxybutyrate, ethyl acetoacetate, methyl lactate, ethyl lactate, 3 -Esters such as methyl methoxypropionate; halogenated hydrocarbons such as chloroform, methylene chloride and tetrachloroethane; aromatic hydrocarbons such as benzene, toluene and xylene; dimethylformamide, dimethylacetamide, N-methylpyrrolidone and the like High polar solvents and the like can be mentioned.
When the dye composition of the present invention contains a solvent, the content ratio thereof is not particularly limited, but is preferably 80% by mass or more, more preferably 85% by mass or more, further preferably 88% by mass or more, and 99% by mass. The following is preferable, 95% by mass or less is more preferable, and 92% by mass or less is further preferable. When it is at least the lower limit value, the solution stability tends to be good, and when it is at least the upper limit value, the performance of the coating film tends to be improved.

[2] Membrane Next, the film of the present invention will be described. The film of the present invention is formed by using the above-mentioned dye composition of the present invention.
Since the film of the present invention is excellent in shielding property in the near infrared region and transparency in the visible region, it can be preferably used as a near infrared cut filter. The film of the present invention can also be used as an infrared transmission filter or a heat ray shielding filter. The film of the present invention may have a pattern or may be a film having no pattern (flat film). Further, the film of the present invention may be used by being laminated on the support, or may be peeled off from the support and used.

The film thickness of the film of the present invention can be appropriately adjusted according to the intended purpose. The film thickness is preferably 20 μm or less, more preferably 10 μm or less, and even more preferably 5 μm or less. The lower limit of the film thickness is preferably 0.1 μm or more, more preferably 0.2 μm or more, and further preferably 0.3 μm or more.

The film of the present invention can also be used in combination with a color filter.

In the present invention, the near-infrared cut filter means a filter that transmits light having a wavelength in the visible region (visible light) and blocks at least a part of light having a wavelength in the near-infrared region (near infrared light). .. The near-infrared cut filter may transmit all the light having a wavelength in the visible region, and among the light having a wavelength in the visible region, it passes the light in a specific wavelength region and blocks the light in the specific wavelength region. It may be something to do. Further, in the present invention, the color filter means a filter that passes light in a specific wavelength region and blocks light in a specific wavelength region among light having a wavelength in the visible region. Further, the infrared transmission filter means a filter that blocks light having a wavelength in the visible region and transmits at least a part of light having a wavelength in the near infrared region (near infrared ray).

When the film of the present invention is used as a near-infrared cut filter, the film of the present invention preferably has a maximum absorption wavelength in the wavelength range of 650 to 1500 nm. The average transmittance at a wavelength of 400 to 550 nm is preferably 70% or more, more preferably 80% or more, further preferably 85% or more, and particularly preferably 90% or more. Further, the transmittance in the entire range of the wavelength of 400 to 550 nm is preferably 70% or more, more preferably 80% or more, and further preferably 90% or more.
The preferred range of infrared shielding property of the near-infrared cut filter varies depending on the application, but the transmittance at at least one point in the wavelength range of 650 to 1500 nm is preferably 20% or less, more preferably 15% or less. 10% or less is more preferable.

When the film of the present invention is used as a near-infrared cut filter, it may further have a copper-containing layer, a dielectric multilayer film, an ultraviolet absorbing layer, or the like, in addition to the film of the present invention.

When the film of the present invention is used as a near-infrared cut filter or an infrared transmission filter, a near-infrared cut filter and an infrared transmission filter can be used in combination. By using a near-infrared cut filter and an infrared transmission filter in combination, it can be preferably used for an infrared sensor that detects infrared rays having a specific wavelength. When both filters are used in combination, both a near-infrared cut filter and an infrared transmission filter can be formed using the composition of the present invention, and only one of them is formed using the composition of the present invention. You can also do it.

The film of the present invention can be used for solid-state imaging devices such as CCD (charge coupling element) and CMOS (complementary metal oxide semiconductor), and various devices such as infrared sensors and image display devices.

[3] Optical Filter Next, the optical filter of the present invention will be described. The optical filter of the present invention has the above-mentioned film of the present invention. The optical filter of the present invention can be preferably used as at least one selected from a near-infrared cut filter and an infrared transmission filter.

[4] Laminated body The laminated body of the present invention has the film of the present invention and a color filter. In the laminate of the present invention, the film of the present invention and the color filter may or may not be adjacent to each other in the thickness direction. When the film of the present invention and the color filter are not adjacent to each other in the thickness direction, the film of the present invention may be formed on a substrate different from the substrate on which the color filter is formed. Other members (for example, a microlens, a flattening layer, etc.) constituting the solid-state image sensor may be interposed between the film and the color filter.

[5] Solid-state image sensor The solid-state image sensor of the present invention has the above-mentioned film of the present invention. The configuration of the solid-state image sensor of the present invention is not particularly limited as long as it has the film of the present invention and functions as a solid-state image sensor. For example, the following configuration can be mentioned.

On the support, a transfer electrode made of a plurality of photodiodes and polysilicon or the like constituting the light receiving area of the solid-state image sensor is provided, and light shielding made of tungsten or the like having only the light receiving portion of the photodiode opened on the photodiode and the transfer electrode. It has a film, has a device protective film made of silicon nitride or the like formed so as to cover the entire surface of the light-shielding film and the photodiode light-receiving part on the light-shielding film, and has the film of the present invention on the device protective film. is there. Further, a configuration having a condensing means (for example, a microlens or the like; the same applies hereinafter) on the device protective film under the film of the present invention (the side closer to the support), or condensing on the film of the present invention. It may be a configuration having means or the like. Further, the color filter may have a structure in which a cured film forming each color pixel is embedded in a space partitioned by a partition wall, for example, in a grid pattern. In this case, the partition wall preferably has a low refractive index for each color pixel. Examples of the image pickup apparatus having such a structure include the apparatus described in JP-A-2012-227478 and JP-A-2014-179757.

[6] Image Display Device The film of the present invention can also be used in an image display device such as a liquid crystal display device or an organic electroluminescence (organic EL) display device. For example, the film of the present invention is added to each colored pixel for the purpose of blocking infrared light contained in a backlight (for example, a white light emitting diode (white LED)) of an image display device, for preventing malfunction of peripheral devices, and for the purpose of preventing malfunction of peripheral devices. It can be used for the purpose of forming infrared pixels.

For details on the image display device, see, for example, "Electronic Display Device (Akio Sasaki, Kogyo Chosakai Co., Ltd., 1990)", "Display Device (Junaki Ibuki, Sangyo Tosho Co., Ltd., 1989)". It is described in. Further, the liquid crystal display device is described in, for example, "Next Generation Liquid Crystal Display Technology (edited by Tatsuo Uchida, published by Kogyo Chosakai Co., Ltd. in 1994)". The liquid crystal display device to which the present invention can be applied is not particularly limited, and for example, it can be applied to various types of liquid crystal display devices described in the above-mentioned "next-generation liquid crystal display technology".

The image display device may have a white organic EL element. The white organic EL element preferably has a tandem structure. Regarding the tandem structure of organic EL elements, Kai 2003-45676, supervised by Akiyoshi Mikami, "Forefront of Organic EL Technology Development-High Brightness, High Precision, Long Life, Know-how Collection-", Technical Information Association, 326 -Page-328, 2008, etc. The spectrum of white light emitted by the organic EL element preferably has a strong maximum emission peak in the blue region (430 nm-485 nm), the green region (530 nm-580 nm), and the yellow region (580 nm-620 nm). In addition to these emission peaks, those having a maximum emission peak in the red region (650 nm-700 nm) are more preferable.

[6] Infrared sensor The infrared sensor of the present invention has the above-mentioned film of the present invention. The configuration of the infrared sensor of the present invention is not particularly limited as long as it has the film of the present invention and functions as an infrared sensor. For example, the embodiments described in [0201] to [0207] of JP-A-2018-45011 can be mentioned.

Hereinafter, the dye composition of the present invention will be described with reference to specific examples, but the present invention is not limited to the following examples as long as the gist of the present invention is not exceeded.

<Preparation of dye composition and optical filter>
10 g of Dianal BR-80 (manufactured by Mitsubishi Chemical Co., Ltd.) was dissolved in 90 g of a mixed solvent in which tetrahydrofuran and 2-methoxymethanol were mixed at a mass ratio of 4: 6, and the squarylium compounds shown in Table 1 were further added. The dye composition of Example 1 was prepared by stirring well.
The obtained dye composition was applied onto a polyethylene terephthalate film and dried at 90 ° C. for 2 minutes to form a film having a thickness of 7 μm to prepare an optical filter.

The maximum absorption wavelength of the squarylium compound in Table 1 is a tetrahydrofuran solution prepared by using a JASCO V-670 ultraviolet-visible spectroscope (manufactured by JASCO Corporation) so that the absorbance at the maximum absorption wavelength becomes 1. Was prepared and read from the measured absorption spectrum.

<Evaluation of optical filter>
Using a spectrophotometer U-4100 (manufactured by Hitachi High-Tech Science Co., Ltd.), the transmittance spectrum of the optical filter in the wavelength range of 380 nm to 1000 nm was measured with reference to a polyethylene terephthalate film. The obtained transmission spectrum is shown in FIG.
As is clear from FIG. 1, by using a mixture containing three or more types of squarylium compounds having different maximum absorption wavelengths of 50 nm or more within the wavelength range of 650 to 900 nm as the squarylium dye, the short wavelength side of the near infrared is used. An optical filter was obtained that shields the entire region in a well-balanced manner and transmits light in the visible region.

Claims (8)

A pigment composition containing a squarylium-based pigment.
A dye composition, wherein the squarylium-based dye is a mixture containing three or more kinds of squarylium-based compounds having different maximum absorption wavelengths of 50 nm or more within a wavelength range of 650 to 900 nm. The mixture is a squarylium compound (a1) having a maximum absorption wavelength in the range of 650 to 740 nm, a squarylium compound (a2) having a maximum absorption wavelength in the range of 740 to 830 nm, and a squarylium compound (a2) having a maximum absorption wavelength in the range of 830 to 900 nm. The dye composition according to claim 1, which contains a squarylium-based compound (a3) having a maximum absorption wavelength. The pigment composition according to claim 1 or 2, further comprising a binder resin. A film formed by using the dye composition according to any one of claims 1 to 3. The optical filter having the film according to claim 4. The solid-state imaging device having the film according to claim 4. An image display device having the film according to claim 4. The infrared sensor having the film according to claim 4.

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