JP2021124569A - Light absorbing composition, light absorption film, and optical filter - Google Patents

Abstract

To provide a light absorbing composition advantageous to blocking a light with a wavelength of around 400 nm so as to obtain spectral characteristics similar to a transmission spectrum corresponding to human visibility.SOLUTION: A light absorbing composition contains a compound including a phosphonic acid and a copper component, and an ultraviolet absorbing compound. A transmission spectrum of a light absorption film, obtained by curing the light absorbing composition, with an incident angle of 0 degree satisfies the following conditions: 16≤T550/T400 and 16≤T550/T800, in which T400 is the transmittance with a wavelength of 400 nm, T550 is the transmittance with a wavelength of 550nm, and T800 is the transmittance with a wavelength of 800nm.SELECTED DRAWING: None

Description

The present invention relates to a light absorbing composition, a light absorbing film, and an optical filter.

In an image sensor using a solid-state image sensor such as CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor), various optical filters are placed in front of the solid-state image sensor in order to obtain an image with good color reproducibility. Has been done. Generally, a solid-state image sensor has spectral sensitivity in a wide wavelength range from an ultraviolet region to an infrared region. On the other hand, human luminosity factor exists only in the visible light region. Therefore, in order to bring the spectral sensitivity of the solid-state image sensor in the image sensor close to the human visual sensitivity, there is known a technique of arranging an optical filter that blocks a part of infrared rays or ultraviolet rays in front of the solid-state image sensor. ..

Conventionally, as such an optical filter, a filter that shields infrared rays or ultraviolet rays by utilizing light reflection by a dielectric multilayer film has been generally used. On the other hand, in recent years, an optical filter provided with a film containing a light absorber has attracted attention. Since the transmittance characteristics of an optical filter provided with a film containing a light absorber are not easily affected by the angle of incidence, a good image with little change in color even when light is obliquely incident on the optical filter in an imaging device can be obtained. Obtainable. In addition, a light-absorbing optical filter that does not use a light-reflecting film can suppress the occurrence of ghosts and flares caused by multiple reflections by the light-reflecting film, so that a good image can be obtained in backlight conditions and night scenes. Cheap. In addition, an optical filter provided with a film containing a light absorber is advantageous in terms of miniaturization and thinning of the image pickup apparatus.

As such a light absorber, a light absorber formed by phosphonic acid and copper ions is known. For example, Patent Document 1 describes an optical filter including a light absorbing layer containing a light absorbing agent formed of a phosphonic acid (phenyl-based phosphonic acid) having a phenyl group or a halogenated phenyl group and copper ions. Has been done.

Further, Patent Document 2 describes an optical filter provided with a UV-IR absorbing layer capable of absorbing infrared rays and ultraviolet rays. The UV-IR absorption layer contains a UV-IR absorber formed by phosphonic acid and copper ions. The UV-IR absorbing composition contains, for example, a phenyl-based phosphonic acid and a phosphonic acid having an alkyl group or an alkyl halide group (alkyl-based phosphonic acid) so that the optical filter satisfies a predetermined optical property. ing.

Further, Patent Document 3 describes an infrared cut filter including an organic dye-containing layer containing a predetermined organic dye and a copper phosphonate-containing layer.

International Publication No. 2018/0885661 Japanese Patent No. 6232161 International Publication No. 2017/006571

In order to obtain spectral characteristics closer to the transmission spectrum corresponding to human visual sensitivity, the light absorption film is required to sufficiently absorb and shield light having a wavelength of around 400 nm. From this point of view, it is expected that the transmission spectrum of the optical filter described in the above patent document at a wavelength of around 400 nm needs to be improved.

In view of such circumstances, the present invention provides a light-absorbing composition that is advantageous for blocking light having a wavelength of around 400 nm in order to obtain spectral characteristics close to the transmission spectrum corresponding to human visual sensitivity.

The present invention
A light-absorbing composition
Compounds containing phosphonic acid and copper components,
Contains UV-absorbing compounds,
In the transmittance spectrum of the light absorbing film obtained by curing the light absorbing composition at an incident angle of 0 degrees, the transmittance T _{400 at} a wavelength of 400 nm, the transmittance T _{550 at} a wavelength of 550 nm, and the transmittance at a wavelength of 800 nm. T ₈₀₀ satisfies the conditions of 16 ≦ T ₅₅₀ / T ₄₀₀ and 16 ≦ T ₅₅₀ / T _800.
A light absorbing composition is provided.

In addition, the present invention
It is a light absorption film
Compounds containing phosphonic acid and copper components,
Contains UV-absorbing compounds,
In the transmittance spectrum of the light absorbing film at an incident angle of 0 degrees, the transmittance T _{400 at} a wavelength of 400 nm, the transmittance T _{550 at} a wavelength of 550 nm, and the transmittance T _{800 at a} wavelength of 800 nm are 16 ≦ T ₅₅₀ / T _400. And 16 ≤ T ₅₅₀ / T ₈₀₀ condition,
Provide a light absorption film.

The present invention also provides an optical filter provided with the above-mentioned light absorption film.

The above-mentioned light-absorbing composition is advantageous for shielding light having a wavelength of around 400 nm in order to obtain spectral characteristics close to the transmission spectrum corresponding to human visual sensitivity. In addition, the light absorption film and the optical filter are advantageous from the viewpoint of shielding light having a wavelength of around 400 nm in order to obtain spectral characteristics close to the transmission spectrum corresponding to human visual sensitivity.

FIG. 1 is a cross-sectional view showing an example of a light absorption film according to the present invention. FIG. 2 is a cross-sectional view showing an example of an optical filter according to the present invention. FIG. 3 is a transmission spectrum of the optical filter according to the first embodiment. FIG. 4 is a transmission spectrum of the optical filter according to the second embodiment. FIG. 5 is a transmission spectrum of the optical filter according to the third embodiment. FIG. 6 is a transmission spectrum of the optical filter according to the fourth embodiment. FIG. 7 is a transmission spectrum of the optical filter according to the fifth embodiment. FIG. 8 is a transmission spectrum of the optical filter according to Comparative Example 1. FIG. 9 is a transmission spectrum of the optical filter according to Comparative Example 2. FIG. 10 is a transmission spectrum of the optical filter according to Comparative Example 3. FIG. 11 is a transmission spectrum of the ultraviolet absorbing compound.

Hereinafter, embodiments of the present invention will be described. The following description relates to an example of the present invention, and the present invention is not limited to the following embodiments.

The light-absorbing composition according to the present invention contains a compound containing a phosphonic acid and a copper component, and an ultraviolet-absorbing compound. Compounds containing phosphonic acid and copper components typically have predetermined light absorption properties. A compound containing a phosphonic acid and a copper component is also called a phosphonic acid-containing compound. The light-absorbing composition can be cured to obtain a light-absorbing film. In the transmittance spectrum of this light absorption film at an incident angle of 0 degrees, the transmittance T _{400 at} a wavelength of 400 nm, the transmittance T _{550 at} a wavelength of 550 nm, and the transmittance T _{800 at a} wavelength of 800 nm are 16 ≦ T ₅₅₀ / T _400. And 16 ≦ T ₅₅₀ / T ₈₀₀ . The light-absorbing composition contains a phosphonic acid-containing compound and an ultraviolet-absorbing compound so that these conditions are satisfied. As a result, the light absorbing film and the optical filter provided by using the light absorbing composition can sufficiently absorb and shield the light having a wavelength of around 400 nm. In addition, the light absorbing film and the optical filter provided by using the light absorbing composition are likely to block light belonging to the ultraviolet region and light belonging to the infrared region. Further, in the light absorbing film and the optical filter provided by using the light absorbing composition, the transmittance of light belonging to the visible light region tends to be high. As a result, the light absorbing film and the optical filter provided by using the light absorbing composition tend to have spectral characteristics close to the transmission spectrum corresponding to human visual sensitivity.

The transmittance T ₄₀₀ and the transmittance T ₅₅₀ preferably satisfy the condition of 32 ≦ T ₅₅₀ / T ₄₀₀ , more preferably satisfy the condition of 80 ≦ T ₅₅₀ / T ₄₀₀ , and more preferably 90 ≦ T ₅₅₀ / T _400. Satisfy the conditions. As a result, the light absorbing film and the optical filter provided by using the light absorbing composition can sufficiently absorb and shield the light having a wavelength of around 400 nm. In addition, the light absorbing film and the optical filter provided by using the light absorbing composition tend to block light belonging to the ultraviolet region. Further, in the light absorbing film and the optical filter provided by using the light absorbing composition, the transmittance of light belonging to the visible light region tends to be high.

The transmittance T ₅₅₀ and the transmittance T ₈₀₀ preferably satisfy the condition of 32 ≦ T ₅₅₀ / T ₈₀₀ , more preferably satisfy the condition of 80 ≦ T ₅₅₀ / T ₈₀₀ , and more preferably 200 ≦ T ₅₅₀ / T _800. The condition of 300 ≦ T ₅₅₀ / T ₈₀₀ is particularly preferable. As a result, the light absorbing film and the optical filter provided by using the light absorbing composition can more reliably block the light belonging to the infrared region. In addition, in the light absorbing film and the optical filter provided by using the light absorbing composition, the transmittance of light belonging to the visible light region tends to be more surely increased.

In the above transmission spectrum, for example, the following conditions (I), (II), (III), and (IV) are satisfied. As a result, the light absorbing film and the optical filter provided by using the light absorbing composition more reliably sufficiently absorb and shield the light having a wavelength of around 400 nm, and the light belonging to the ultraviolet region and the light belonging to the infrared region can be easily blocked. Is easier to shield more reliably. In addition, in the light absorbing film and the optical filter provided by using the light absorbing composition, the transmittance of light belonging to the visible light region tends to be more surely increased. As a result, the light absorbing film and the optical filter provided by using the light absorbing composition tend to have spectral characteristics close to the transmission spectrum corresponding to human visual sensitivity.
(I) a maximum value T ^M _300-380 transmittance in the wavelength range of 300nm~380nm is 1% or less.
(II) The transmittance T _{400 at a} wavelength of 400 nm is 5% or less.
(III) mean T ^A _480-580 transmittance in the wavelength range of 480nm~580nm is 78% or more.
(IV) the average value T ^A _700-750 transmittance in the wavelength range of 700nm~750nm is 10% or less.

Respect conditions (I), in the transmission spectrum, desirably, the maximum value T ^M _300-385 transmittance in the wavelength range of 300nm~385nm it is 1% or less, more desirably in the range of wavelength 300nm~390nm maximum value T ^M _300-390 of transmittance in is 1% or less. As a result, in the light absorbing film and the optical filter provided by using the light absorbing composition, it is easy to more reliably block the light belonging to the ultraviolet region.

Regarding the condition (II), in the above transmission spectrum, the transmittance T ₄₀₀ is preferably 3% or less, more preferably 1% or less. As a result, the light absorption film and the optical filter provided by using the light absorption composition can more reliably sufficiently absorb and shield the light having a wavelength of around 400 nm.

Relates condition (III), in the transmission spectrum, the average value T ^A _480-580 is desirably 80% or more, more desirably 82% or more. As a result, the transmittance of light belonging to the visible light region tends to be more reliably increased in the light absorbing film and the optical filter provided by using the light absorbing composition.

It relates condition (IV), in the transmission spectrum, the average value T ^A _700-750 is desirably 5% or less, more desirably 3% or less. This makes it easier to more reliably block light belonging to the infrared region in the light absorbing film and the optical filter provided by using the light absorbing composition.

In the above transmission spectrum, for example, the following condition (V) is satisfied. This makes it easier to more reliably block light belonging to the infrared region in the light absorbing film and the optical filter provided by using the light absorbing composition.
(V) maximum value T ^M _700-1000 transmittance in the wavelength range of 700nm~1000nm is 10% or less.

Relates condition (V), the maximum value T ^M _700-1000 is desirably 7% or less, more preferably 5% or less.

The transmission spectrum described above has, for example, a first cutoff wavelength λ ^50% _F of 405 nm or more and 480 nm or less. The first cutoff wavelength λ ^50% _F is a wavelength showing a transmittance of 50% in the wavelength range of 300 nm to 450 nm in the above transmission spectrum. As a result, the light absorption film and the optical filter provided by using the light absorption composition can more reliably sufficiently absorb and shield the light having a wavelength of around 400 nm.

The first cutoff wavelength λ ^50% _F is preferably 405 nm or more and 465 nm or less, and more preferably 405 nm or more and 450 nm or less.

The transmission spectrum described above has, for example, a second cutoff wavelength λ ^50% _S of 580 nm or more and 720 nm or less. The second cutoff wavelength λ ^50% _S is a wavelength showing a transmittance of 50% in the wavelength range of 550 nm to 750 nm in the above transmission spectrum. As a result, the light absorbing film and the optical filter provided by using the light absorbing composition can more reliably block the light belonging to the infrared region.

The second cutoff wavelength λ ^50% _S is preferably 590 nm or more and 700 nm or less, and more preferably 600 nm or more and 680 nm or less.

The above transmission spectrum satisfies at least one of the following conditions (VI), (VII), and (VIII), for example. As a result, the light absorbing film and the optical filter provided by using the light absorbing composition can more reliably block the light belonging to the infrared region.
(VI) The maximum value T ^M _800-950 transmittance in the wavelength range of 800nm~950nm is 3% or less.
(VII) the maximum value T ^M _700-1100 transmittance in the wavelength range of 700nm~1100nm is 15% or less.
(VIII) maximum value T ^M _700-1200 transmittance in the wavelength range of 700nm~1200nm is 20% or less.

Respect conditions (VI), the maximum value T ^M _800-950 is desirably 1.5% or less, more preferably 1% or less.

Respect conditions (VII), the maximum value T ^M _700-1100 is preferably 10% or less, more preferably 5% or less.

Respect conditions (VIII), the maximum value T ^M _700-1200 is desirably 15% or less, more preferably 10% or less.

The phosphonic acid contained in the phosphonic acid-containing compound is not limited to a specific phosphonic acid. The phosphonic acid is represented by, for example, the following formula (a).

In formula (a), R ₁ is an alkyl group, at least one in an alkyl group, an alkyl halide group in which at least one hydrogen atom is replaced with a halogen atom, an aryl group, a nitroaryl group, a hydroxyaryl group, or an aryl group. An aryl halide group in which one hydrogen atom is replaced with a halogen atom. The aryl group is, for example, a phenyl group, a benzyl group, or a toluyl group.

The phosphonic acid contained in the phosphonic acid-containing compound may be an aryl phosphonic acid having an aryl group, a nitroaryl group, a hydroxyaryl group, or an aryl halide group. Aryl-based phosphonic acids are not limited to specific phosphonic acids. The aryl phosphonic acid is, for example, phenylphosphonic acid, nitrophenylphosphonic acid, hydroxyphenylphosphonic acid, bromophenylphosphonic acid, or iodophenylphosphonic acid.

The phosphonic acid contained in the phosphonic acid-containing compound may be an alkyl-based phosphonic acid having an alkyl group or an alkyl halide group. Alkyl phosphonic acids are not limited to specific phosphonic acids. Alkyl phosphonic acids include, for example, methylphosphonic acid, ethylphosphonic acid, normal (n-) propylphosphonic acid, isopropylphosphonic acid, normal (n-) butylphosphonic acid, isobutylphosphonic acid, sec butylphosphonic acid, or tertbutylphosphonic acid. It is an acid or bromomethylphosphonic acid.

When the phosphonic acid contained in the phosphonic acid-containing compound is an aryl-based phosphonic acid, the phosphonic acid-containing compound is formed by the aryl-based phosphonic acid and the copper component, so that the phosphonic acid is relatively in the wavelength range of light belonging to the infrared region. Light with a short wavelength is easily absorbed effectively. On the other hand, when the phosphonic acid contained in the phosphonic acid-containing compound is an alkyl-based phosphonic acid, the phosphonic acid-containing compound is formed by the alkyl-based phosphonic acid and the copper component, so that the phosphonic acid-containing compound is formed in the wavelength range of light belonging to the infrared region. Light of a relatively long wavelength is easily absorbed effectively. Therefore, the light-absorbing composition preferably contains both aryl-based phosphonic acid and alkyl-based phosphonic acid as phosphonic acids.

When the light-absorbing composition contains an aryl-based phosphonic acid and an alkyl-based phosphonic acid, the relationship between the content of the aryl-based phosphonic acid and the content of the alkyl-based phosphonic acid is not limited to a specific relationship. In light absorbing composition, the ratio R _AA content of aryl systems phosphonate to the content of alkyl type phosphonic acids, for example, 1.0 to 3.0 with a material basis. This makes it easy for the transmission spectra of the light absorbing film and the optical filter provided using the light absorbing composition to be used together with the image sensor. In light absorbing composition, the ratio R _AA, desirably 1.3 to 2.7.

The phosphonic acid contained in the phosphonic acid-containing compound may be a phosphonic acid having no group containing a halogen atom as a substituent. In this case, the light absorbing film and the optical filter provided by using the light absorbing composition are likely to have good environmental resistance or are not easily discolored.

In the light-absorbing composition, at least a part of the copper component reacts with phosphonic acid to form a compound such as a complex containing phosphonic acid and the copper component. A compound containing a phosphonic acid and a copper component easily absorbs a part of light belonging to the infrared region effectively, and further exhibits high transmittance for light belonging to the visible light region.

The mode of supplying the copper component in the preparation of the light absorbing composition is not limited to a specific mode. In the preparation of light-absorbing compositions, the copper component is supplied, for example, as a copper salt. The copper salt may be an anhydride or hydrate of copper chloride, copper formate, copper stearate, copper benzoate, copper pyrophosphate, copper naphthenate, and copper citrate. For example, copper acetate monohydrate is _{represented as Cu (CH 3} COO) ₂ · H ₂ O, and 1 mol of copper ion is supplied by 1 mol of copper acetate monohydrate.

The ultraviolet-absorbing compound contained in the light-absorbing composition is not limited to a specific compound as long as the conditions _{of 16 ≦ T 550} / T ₄₀₀ and 16 ≦ T ₅₅₀ / T _{800 are satisfied in the above transmission spectrum.} The ultraviolet absorbing compound has, for example, an absorption maximum wavelength λ ^M _UV-C of 330 nm or more and 430 nm or less. As a result, according to the light absorption film and the optical filter provided by using the light absorption composition, when used in combination with the compound containing the phosphonic acid and the copper component, the transmission characteristics at a wavelength of 400 nm to 450 nm are obtained. , It is easy to have spectral characteristics close to the transmission spectrum corresponding to human luminosity factor. The optical characteristics such as the transmission spectrum and the absorption spectrum of the ultraviolet-absorbing compound can be determined by measurement using a dispersion liquid in which the ultraviolet-absorbing compound is dispersed in a predetermined solvent as a sample. Unless otherwise specified, the transmission and absorption spectra of UV-absorbing compounds mean those determined by such measurements.

The absorption maximum wavelength λ ^M _UV-C of the ultraviolet absorbing compound is preferably 350 nm or more and 400 nm or less.

^{The maximum wavelength λ 50% -L} _UV-C and the minimum wavelength λ ^{50% -S} _UV-C , which show 50% transmittance in the transmission spectrum of UV-absorbing compounds in the wavelength range of 300 nm to 450 nm, are specific values. Not limited to. The wavelength λ ^{50% -L} _UV-C is, for example, 400 nm or more and 470 nm or less. As a result, according to the light absorption film and the optical filter provided by using the light absorption composition, when used in combination with the compound containing the phosphonic acid and the copper component, the absorption maximum wavelength λ ^M _UV-C In addition to the above-mentioned effects obtained by satisfying the above conditions, the transmittance in the vicinity of a wavelength of 400 nm can be easily controlled to be small, and the transmittance of light belonging to the visible light region tends to be increased more reliably. As a result, the light absorbing film and the optical filter provided by using the light absorbing composition tend to have spectral characteristics close to the transmission spectrum corresponding to human visual sensitivity. The concentration of the UV-absorbing compound in the sample used in the measurement of the transmission spectrum of the UV-absorbing compound for determining the wavelength λ ^{50% -L} _UV-C and the wavelength λ ^{50% -S} _{UV-C is absorbed.} The transmittance at the maximum wavelength λ ^M _UV-C is adjusted to be 8 to 12%.

The wavelength λ ^{50% -L} _UV-C is preferably 415 nm or more and 450 nm or less.

The wavelength λ ^{50% -S} _UV-C and the wavelength λ ^{50% -L} _UV-C satisfy, for example, the condition of 75 nm ≤ λ ^{50% -L} _UV-C −λ ^{50% -S} _UV-C ≤ 105 nm. ^{The wavelength λ 50% -S} _{IR at} which the transmittance of the light-absorbing compound containing the phosphonic acid and the copper component at a wavelength of 300 nm to 450 nm is 50% is λ ^{50% -L} _UV-C and λ. ^{It is easily contained between 50% -S} _UV-C , and when used in combination with a compound containing phosphonic acid and a copper component, the transmission characteristics at wavelengths of 400 nm to 450 nm have a transmission spectrum corresponding to human visual sensitivity. Further, the merit that it is easy to have close spectral characteristics can be obtained. The wavelength λ ^{50% -S} _UV-C and the wavelength λ ^{50% -L} _UV-C preferably satisfy the condition of 80 nm ≤ λ ^{50% -L} _UV-C −λ ^{50% -S} _{UV-C ≤ 100 nm.}

In the transmission spectrum of the ultraviolet-absorbing compound, the ^{wavelength λ 80%} _{UV-C, which} ^{is longer than the absorption maximum wavelength λ M} _UV-C and exhibits 80% transmission, is, for example, 1.8 [% / nm] ≦ 30. / (Λ ^80% _UV-C −λ ^{50% -L} _UV-C ) ≦ 2.6 [% / nm] is satisfied. The value of 30 / (λ ^80% _UV-C −λ ^{50% -L} _UV-C ) is the value of the UV absorbing compound in the range between the ^{wavelength λ 50% -L} _UV-C and the wavelength λ ^80% _UV-C. It represents the average gradient of the transmission spectrum, and this value ^{is also expressed as Δλ 80/50} _UV-C [% / nm]. The ^{inclusion of} _{Δλ 80/50 UV-C} in these ranges improves consistency with similar gradient values in the transmission spectrum of the light-absorbing phosphonic acid and copper component-containing compounds, resulting in phosphones. When used in combination with a compound containing an acid and a copper component, it is possible to further obtain the advantage that the transmission characteristics at a wavelength of 400 nm to 450 nm tend to have spectral characteristics close to the transmission spectrum corresponding to human luminosity factor. Desirably, the condition of 1.9 [% / nm] ^{≤Δλ 80/50} _UV-C ≤2.4 [% / nm] is satisfied, and more preferably 1.9 [% / nm] ^{≤Δλ 80/50} _{UV. -C} ≤ 2.3 [% / nm].

_{The minimum transmittance T m 500-700} in the transmission spectrum of the ultraviolet absorbing compound in the wavelength range of ^{500 nm to} 700 nm is not limited to a specific value. The minimum value T ^m _500-700 is, for example, 80% or more. As a result, in the light absorbing film and the optical filter provided by using the light absorbing composition, the transmittance of light belonging to the visible light region tends to be more reliably increased. The minimum value T ^m _500-700 is preferably 85% or more, and more preferably 90% or more.

_{As described above, as long as the conditions of 16 ≦ T 550} / T ₄₀₀ and 16 ≦ T ₅₅₀ / T ₈₀₀ are satisfied in the transmission spectrum of the light absorbing film obtained by curing the light absorbing composition, the ultraviolet absorbing compound is used. , Not limited to specific compounds. On the other hand, the ultraviolet-absorbing compound is preferably a compound that has good compatibility with other components such as a phosphonic acid-containing compound contained in the light-absorbing composition, and its performance is not significantly deteriorated by the other components. In addition, the UV-absorbing compound is preferably a compound that does not have significantly inferior moisture resistance or light resistance.

The ultraviolet absorbing compound is, for example, a compound such as a benzophenone-based compound, a benzotriazole-based compound, a benzoate-based compound, a cyanocrylate-based compound, or a triazine-based compound.

Examples of the benzotriazole-based compound include the following compounds.
2- (2'-Hydroxy-5'-methylphenyl) benzotriazole 2- (2'-hydroxy-3'-t-butyl-5'-methylphenyl) -5-chlorobenzotriazole 2- (2'-hydroxy) -3', 5'-di-t-butylphenyl) -5-chlorobenzotriazole 2- (2'-hydroxy-3', 5'-di-t-butylphenyl) benzotriazole 2- (2'-hydroxy) -5-t-octylphenyl) benzotriazole 2- (2'-hydroxy-5-t-butylphenyl) benzotriazole 2- [2'-hydroxy-3'-(3 ", 4", 5 "" , 6''-Tetrahydrophthalimidomethyl) -5'-Methylphenyl] Benzotriazole 2- (2'-Hydroxy-3', 5'-di-t-amylphenyl) Benzotriazole 2- [2'-Hydroxy- 3', 5'-bis (α, α-dimethoxybenzoyl) phenyl] benzotriazole 2,2'-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2N-benzotriazole-) 2-Il) phenol]
2- (2'-Hydroxy-5'-methacryloyloxyethylphenyl) -2H-benzotriazole 2- (2'-hydroxy-3'-dodecyl-5'-methylphenyl) benzotriazole

Examples of the triazine-based compound include the following compounds.
2,4-bis (trichloromethyl) -6- (4-methoxyphenyl) -1,3,5-triazine 2,4-bis (trichloromethyl) -6- (4-methoxynaphthyl) -1,3,5 -Triazine 2,4-bis (trichloromethyl) -6- (4-methoxystyryl) -1,3,5-triazine 2,4-bis (trichloromethyl) -6- [2- (5-methylfuran-2) -Il) Ethenyl] -1,3,5-triazine 2,4-bis (trichloromethyl) -6- [2- (fran-2-yl) ethenyl] -1,3,5-triazine 2,4-bis (Trichloromethyl) -6- [2- (4-diethylamino-2-methylphenyl) ethenyl] -1,3,5-triazine 2,4-bis (trichloromethyl) -6- [2- (3,4-) Dimethoxyphenyl) ethenyl] -1,3,5-triazine 2- (4,6-diphenyl-1,3,5-triazine-2-yl) -5-[(hexyl) oxy] -phenol

The content of the UV-absorbing compound in the light-absorbing composition is not limited to a specific value. The ratio of the content of phosphonic acid to the content of the ultraviolet absorbing compound in the light absorbing composition _RPU is, for example, 10 to 300 on a mass basis. As a result, the ultraviolet-absorbing compound is unlikely to adversely affect the characteristics of the light-absorbing composition, and the light-absorbing film and the optical filter provided by using the light-absorbing composition more reliably transmit light having a wavelength of around 400 nm. It absorbs well and is easy to shield. The ratio R _PU is preferably 30 to 100.

_{The ratio R UR} of the content of the aryl phosphonic acid to the content of the ultraviolet absorbing compound in the light absorbing composition is not limited to a specific value. The ratio R _UR is, for example, 7 to 180 on a mass basis, preferably 20 to 60. _{The ratio R UL} of the content of the alkyl phosphonic acid to the content of the ultraviolet absorbing compound in the light absorbing composition is not limited to a specific value. The ratio R _UL is, for example, 3 to 120 on a mass basis, preferably 10 to 40. As a result, the light absorbing film and the optical filter provided by using the light absorbing composition tend to have spectral characteristics close to the transmission spectrum corresponding to the human visual sensitivity more reliably.

The light-absorbing composition further contains, for example, a matrix. Phosphonate-containing compounds and UV-absorbing compounds are typically dispersed in the matrix. This matrix is limited to specific materials as long as the conditions _{16 ≦ T 550} / T ₄₀₀ and 16 ≦ T ₅₅₀ / T ₈₀₀ are satisfied in the transmission spectrum for the light absorbing film obtained by curing the light absorbing composition. Not done. The matrix contained in the light-absorbing composition is typically a material having high transparency at wavelengths of 400 nm to 600 nm. For example, when a layer having a thickness of 0.1 mm is formed only from the material, the transmittance of the layer at a wavelength of 400 nm to 600 nm is, for example, 70% or more, preferably 75% or more, and more preferably 80. % Or more, and more preferably 85% or more.

The matrix material contained in the light-absorbing composition is, for example, a resin. The type of resin contained in the light-absorbing composition is not limited to a specific type. The resin is, for example, a cyclic polyolefin resin, an epoxy resin, a polyimide resin, a modified acrylic resin, a silicone resin, or a polyvinyl resin such as PVB. The resin may be a curable resin that can be cured by irradiation with energy such as heat or light. The matrix contained in the light-absorbing composition may be an organic-inorganic hybrid material or an inorganic material formed by hydrolyzing and polycondensing an alkoxide containing a metal component according to a sol-gel method.

The light-absorbing composition may optionally contain a phosphate ester. By the action of the phosphoric acid ester, the light-absorbing composition and the light-absorbing composition are cured, and the phosphonic acid-containing compound is easily dispersed appropriately in the light-absorbing film. The phosphoric acid ester may function as a dispersant for the phosphonic acid-containing compound, and a part thereof may react with a metal component to form a compound. For example, the phosphate ester may coordinate with or react with a phosphonic acid-containing compound containing a copper component and a phosphonic acid. The phosphonic acid-containing compound may contain components of these compounds or copper salts thereof.

Phosphate esters are not limited to specific phosphate esters. Phosphate esters have, for example, polyoxyalkyl groups. Examples of such a phosphoric acid ester include Prysurf A208N: polyoxyethylene alkyl (C12, C13) ether phosphoric acid ester, Plysurf A208F: polyoxyethylene alkyl (C8) ether phosphoric acid ester, and Plysurf A208B: polyoxyethylene. Lauryl Ether Phosphate, Plysurf A219B: Polyoxyethylene Lauryl Ether Phosphate, Plysurf AL: Polyoxyethylene Stylized Phenyl Ether Phosphate, Plysurf A212C: Polyoxyethylene Tridecyl Ether Phosphate, or Ply Surf A215C: Polyoxyethylene tridecyl ether phosphate ester can be mentioned. All of these are products manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd. In addition, as the phosphoric acid ester, NIKKOL DDP-2: polyoxyethylene alkyl ether phosphoric acid ester, NIKKOL DDP-4: polyoxyethylene alkyl ether phosphoric acid ester, or NIKKOL DDP-6: polyoxyethylene alkyl ether phosphoric acid ester. Can be mentioned. All of these are products manufactured by Nikko Chemicals Co., Ltd.

The content of the phosphate ester in the light-absorbing composition is not limited to a specific value. The ratio R _PE content of the phosphonic acid to the content of the phosphoric acid ester in the light-absorbing composition is, for example, 1.0 or more by weight. As a result, even if the light absorbing film and the optical filter provided by using the light absorbing composition come into contact with water vapor, hydrolysis of the phosphate ester is suppressed, and the light absorbing film and the optical filter have good weather resistance. Cheap. The ratio R _PE is preferably 1.5 or more. The ratio R _PE may be 1.0 to 3.0. When the ratio R _PE is 3.0 or less, aggregation of the phosphonic acid-containing compound can be prevented, and the light transmittance belonging to the visible light region in the light absorption film and the optical filter provided by using the light absorption composition. Is more likely to be higher. From the viewpoint of good weather resistance and good optical properties, the ratio R _PE is preferably 1.5 to 2.0.

The photoabsorbable composition further comprises, for example, at least one selected from the group consisting of a metal alkoxide, a hydrolyzed condensate of a metal alkoxide, a silicon alkoxide, and a hydrolyzed condensate of a silicon alkoxide, if necessary. May be good. As a result, the phosphonic acid-containing compound is likely to be uniformly dispersed in the light-absorbing composition or the light-absorbing film and the optical filter provided by using the light-absorbing composition. In the light-absorbing composition, at least two selected from this group may be contained in a mixed state. For example, phosphate esters, metal alkoxides, or silicon alkoxides are mixed with components such as copper and phosphonic acids in the preparation of light-absorbing compositions. In this case, in the preparation of the light-absorbing composition, the metal alkoxide and a part of the silicon alkoxide are formed into fine particles containing the phosphonic acid-containing compound by interaction with a component such as a copper component or a phosphonic acid or a compound containing these. It may be contained.

The metal alkoxide forming the metal alkoxide or the hydrolyzed condensate of the metal alkoxide is, for example, Li, Na, Mg, Ca, Sr, Ba, Ge, Sn, Pb, Al, Ga, In, Tl, Zn, Cd, Cu. , Ag, Au, Ni, Pd, Pt, Co, Rh, Ir, Fe, Mn, Cr, Mo, W, V, Nb, Ta, Ti, and Zr. Is.

The light absorbing composition can be used, for example, to provide the light absorbing film 10 shown in FIG. The light absorbing film 10 is obtained, for example, by curing a coating film of a light absorbing composition. Therefore, the light absorbing film 10 contains a compound containing a phosphonic acid and a copper component and an ultraviolet absorbing compound.

The thickness of the light absorption film 10 is not limited to a specific value. For example, in order to reduce the thickness of the light-absorbing film while exhibiting the desired light-absorbing property, the concentration of the phosphonic acid-containing compound and the ultraviolet-absorbing compound contained in the light-absorbing composition is increased. Can be considered. In this case, the dispersibility of each compound may not be maintained in a desired state. On the other hand, for example, in order to meet the demand for lowering the profile of a device provided with a light absorbing film such as an imaging device, it is advantageous that the thickness of the light absorbing film is small. From such a viewpoint, the thickness of the light absorption film 10 is, for example, 25 μm to 500 μm, preferably 50 μm to 300 μm, and more preferably 75 μm to 250 μm.

As shown in FIG. 1, the optical filter 1a includes a light absorption film 10. As a result, the optical filter 1a sufficiently absorbs and shields light having a wavelength of around 400 nm, and easily shields light belonging to the ultraviolet region. Further, in the optical filter 1a, the transmittance of light belonging to the visible light region tends to be high.

The optical filter 1a is composed of, for example, the light absorption film 10 alone. When the optical filter 1a is composed of the light absorbing film 10 alone, it may be referred to as a light absorbing film or a light absorbing sheet in view of its form. The optical filter 1a can be used separately from, for example, an image pickup device or an optical component. In this case, the optical filter 1a can be manufactured according to a known method for the optical filter. For example, a light absorbing composition is applied onto a substrate to form a coating film, and the coating film is cured to form a light absorbing film 10. After that, the light absorption film 10 is peeled off from the substrate to form a film or a sheet. Thereby, a film or sheet-shaped optical filter 1a can be produced. In this case, the material of the substrate may be glass, resin, or metal. The surface of the substrate may be subjected to surface treatment such as coating with a fluorine-containing compound. For example, an imaging device including an optical filter 1a can be provided.

The optical filter 1a may be formed in contact with the image sensor and the optical component. On the other hand, the light absorbing film 10 may be formed by applying the above light absorbing composition to an image pickup device or an optical component and curing the light absorbing composition. This makes it possible to manufacture an image sensor with a light absorption film or an optical component with a light absorption film. The optical component is, for example, a lens or a cover glass. For example, an image pickup device including an image pickup device with a light absorption film or an optical component with a light absorption film can be provided.

The optical filter 1a may be modified as shown in FIG. 2, for example, the optical filter 1b. The optical filter 1b is configured in the same manner as the optical filter 1a except for a portion to be described in particular. The components of the optical filter 1b that are the same as or correspond to the components of the optical filter 1a are designated by the same reference numerals, and detailed description thereof will be omitted. The description of the optical filter 1a also applies to the optical filter 1b as long as there is no technical contradiction.

As shown in FIG. 2, the optical filter 1b includes a light absorption film 10 and a transparent dielectric substrate 20. The light absorption film 10 is formed parallel to one main surface of the transparent dielectric substrate 20. The light absorption film 10 may be in contact with, for example, one main surface of the transparent dielectric substrate 20. In this case, for example, the light absorbing film 10 can be formed by applying the above light absorbing composition to one main surface of the transparent dielectric substrate 20 and curing the light absorbing composition.

The type of the transparent dielectric substrate 20 is not limited to a specific type. The transparent dielectric substrate 20 may have an absorption capacity in the infrared region. The transparent dielectric substrate 20 may have an average spectral transmittance of 90% or more at a wavelength of, for example, 350 nm to 900 nm. The material of the transparent dielectric substrate 20 is not limited to a specific material, but is, for example, a predetermined glass or resin. When the material of the transparent dielectric substrate 20 is glass, the transparent dielectric substrate 20 is a transparent glass made of silicate glass such as soda-lime glass and borosilicate glass, or a colorable material such as Cu and Co. It can be a phosphate glass or a fluoride glass containing a component. Phosphate glass and fluoride glass containing a coloring component are, for example, infrared absorbing glass, and have light absorbing property by themselves. When the light absorption film 10 is used together with the transparent dielectric substrate 20 of infrared absorbing glass, the light absorption and transmission spectra of both can be adjusted to produce an optical filter having desired optical characteristics. High degree of design freedom.

When the material of the transparent dielectric substrate 20 is a resin, the resin is, for example, a cycloolefin resin such as a norbornene resin, a polyarylate resin, an acrylic resin, a modified acrylic resin, a polyimide resin, a polyetherimide resin, or a polysulfone. It is a resin, a polyether sulfone resin, a polycarbonate resin, or a silicone resin.

Each of the optical filters 1a and 1b may be modified to further include other functional films such as an infrared reflective film and an antireflection film. Such a functional film can be formed on the light absorption film 10 or the transparent dielectric substrate 20. For example, when the optical filter includes an antireflection film, the transmittance in a predetermined wavelength range (for example, visible light region) can be increased. The antireflection film may be configured as a layer of a low refractive index material such as _{MgF 2} and SiO _2, and is a laminate of such a layer of a low refractive index material and a layer of a high refractive index material such as _{TiO 2.} It may be configured as a dielectric multilayer film. Such an antireflection film can be formed by a method involving a physical reaction such as vacuum deposition and sputtering, or a method involving a chemical reaction such as a CVD method and a sol-gel method.

The optical filter may be configured, for example, in a state where the light absorption film 10 is arranged between two plate-shaped glasses. This improves the rigidity and mechanical strength of the optical filter. In addition, the main surface of the optical filter becomes hard, which is advantageous from the viewpoint of preventing scratches and the like. In particular, such an advantage is important when a resin having relatively high flexibility is used as the binder or matrix in the light absorption film 10.

The present invention will be described in more detail by way of examples. The present invention is not limited to the following examples. First, an evaluation method of an optical filter according to each Example and each Comparative Example will be described.

(Transmission spectrum measurement)
Using an ultraviolet-visible near-infrared spectrophotometer V-670 manufactured by JASCO Corporation, the transmission spectrum of the optical filter according to each example and each comparative example at an incident angle of 0 ° was measured.

(Thickness measurement)
The thickness of the optical filter according to each Example and each Comparative Example was measured using a micrometer. The results are shown in Table 4.

<Example 1>
4.500 g of copper acetate monohydrate and 240 g of tetrahydrofuran (THF) were mixed and stirred for 3 hours to obtain a copper acetate solution. Next, a phosphoric acid ester compound, Prysurf A208N (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) was added to the obtained copper acetate solution in an amount of 1.444 g, and the mixture was stirred for 30 minutes to obtain a 1-A solution. .. 40 g of THF was added to 3.576 g of phenylphosphonic acid and stirred for 30 minutes to obtain a 1-B solution. Next, in solution 1-B, 8.664 g of methyltriethoxysilane (MTES) (manufactured by Shin-Etsu Chemical Co., Ltd., product name: KBE-13) and tetraethoxysilane (TEOS) (special grade manufactured by Kishida Chemical Co., Ltd.) 2. 840 g was added, and the mixture was further stirred for 1 minute to obtain 1-C solution. While stirring the 1-A solution, the 1-C solution was added to the 1-A solution, and the mixture was stirred at room temperature for 1 minute. Next, 140 g of toluene was added to this solution, and the mixture was stirred at room temperature for 1 minute to obtain a 1-D solution. The 1-D solution is placed in a flask and heated in an oil bath (manufactured by Tokyo Rika Kikai Co., Ltd., model: OSB-2100) while being desolvated by a rotary evaporator (manufactured by Tokyo Rika Kikai Co., Ltd., model: N-1110SF). Was done. The set temperature of the oil bath was adjusted to 105 ° C. Then, the liquid after the desolvation treatment was taken out from the flask to obtain a 1-E liquid. The 1-E solution was a dispersion of a compound containing an aryl phosphonic acid and a copper component.

3.600 g of copper acetate monohydrate and 200 g of THF were mixed and stirred for 3 hours to obtain a copper acetate solution. Next, to the obtained copper acetate solution, Plysurf A208N, which is a phosphoric acid ester compound, was added in an amount of 2.058 g and stirred for 30 minutes to obtain a 1-F solution. Further, 40 g of THF was added to 2.309 g of n-butylphosphonic acid and stirred for 30 minutes to obtain a 1-G solution. The 1-G solution was added to the 1-F solution while stirring the 1-F solution, and the mixture was stirred at room temperature for 1 minute. Next, 80 g of toluene was added to this solution, and the mixture was stirred at room temperature for 1 minute to obtain a 1-H solution. This 1-H solution was placed in a flask and heated in an oil bath while being desolvated by a rotary evaporator. The set temperature of the oil bath was adjusted to 105 ° C. Then, the liquid after the desolvation treatment was taken out from the flask to obtain 1-I liquid. The 1-I solution was a dispersion of a compound containing butylphosphonic acid and a copper component.

0.3 g of a triazine-based ultraviolet-absorbing compound and 99.7 g of toluene were mixed to obtain a 1-J solution as a dispersion of the ultraviolet-absorbing compound. A sample was prepared by putting 1-J solution into a quartz cell (model number J / 20 / C / CD) manufactured by JASCO Corporation having an optical path length of 0.1 mm, and this sample was used to prepare a triazine-based ultraviolet absorbing compound. The transmission spectrum was measured. The measured transmission spectrum is shown in FIG. According to this transmission spectrum, the absorption maximum wavelength λ ^M _UV-C = 378 nm of the triazine-based ultraviolet absorbing compound, and the transmittance at the absorption maximum wavelength λ ^M _UV-C was 9.90%. Further, λ ^{50% -S} _UV-C = 329 nm, λ ^{50% -L} _UV-C = 419 nm, and λ ^{50% -L} _UV-C − λ ^{50% -S} _UV-C = 90 nm. Further, λ ^80% _UV-C = 433 ^nm _{and Δλ 80/50 UV-C} = 2.14.

1-E solution, 1-I solution, 20.00 g of 1-J solution, 8.80 g of silicone resin KR-300 manufactured by Shin-Etsu Chemical Co., Ltd., and 0.09 g of aluminum alkoxide compound CAT manufactured by Shin-Etsu Chemical Co., Ltd. -AC was mixed and stirred for 30 minutes to obtain the light-absorbing composition according to Example 1.

0.1 g of surface antifouling coating agent (manufactured by Daikin Industries, Ltd., product name: Optool DSX, concentration of active ingredient: 20% by mass) and 19.9 g of hydrofluoroether-containing liquid (manufactured by 3M, product name: Novec 7100) Was mixed and stirred for 5 minutes to prepare a fluorinated agent (concentration of active ingredient: 0.1% by mass). This fluorinated agent was applied by pouring it onto a substrate of borosilicate glass (manufactured by SCHOTT, product name: D263 Eco) having dimensions of 76 mm × 76 mm × 0.21 m. Then, the glass substrate is left at room temperature for 24 hours to dry the coating film of the fluorinated agent, and then the surface of the glass substrate is lightly wiped with a dust-free cloth containing Novec 7100 to remove the excess fluorinated agent. rice field. In this way, a fluorine-treated substrate was produced. The light-absorbing composition according to Example 1 was applied to a range of 40 mm × 40 mm at the center of one main surface of the fluorine-treated substrate using a dispenser to form a coating film. After the obtained coating film was sufficiently dried at room temperature, it was placed in an oven and heat-treated at 45 ° C. for 2 hours and at 85 ° C. for 6 hours to volatilize the solvent and cure it. Then, the coating film was peeled off from the fluorine-treated substrate to obtain an optical filter according to Example 1. The transmission spectrum of the optical filter according to the first embodiment is shown in FIG. 3, and the characteristic values that can be seen from the transmission spectrum are shown in Tables 3 and 4.

<Examples 2 to 5>
In the same manner as in Example 1, the light-absorbing composition according to Example 2, the light-absorbing composition according to Example 3, and Example 4 except that the amount of the raw material added was adjusted as shown in Table 1. Each of the light-absorbing composition according to Example 5 and the light-absorbing composition according to Example 5 was prepared. Instead of the light-absorbing composition according to Example 1, the light-absorbing composition according to Example 2, the light-absorbing composition according to Example 3, the light-absorbing composition according to Example 4, or the example. An optical filter according to Example 2, an optical filter according to Example 3, an optical filter according to Example 4, and an embodiment, respectively, in the same manner as in Example 1 except that the light-absorbing composition according to Example 5 was used. An optical filter according to Example 5 was produced.

The transmission spectra of the optical filter according to Example 2, the optical filter according to Example 3, the optical filter according to Example 4, and the optical filter according to Example 5 are shown in FIGS. 4, 5, 6, and 7, respectively. show. Tables 3 and 4 show the characteristic values of the optical filters according to each embodiment that can be seen from these transmission spectra.

<Comparative example 1>
The light-absorbing composition according to Comparative Example 1 was prepared in the same manner as in Example 1 except that the amount of other raw materials added was adjusted as shown in Table 1 without using Liquid 1-J. An optical filter according to Comparative Example 1 was produced in the same manner as in Example 1 except that the light-absorbing composition according to Comparative Example 1 was used instead of the light-absorbing composition according to Example 1. The transmission spectrum of the optical filter according to Comparative Example 1 is shown in FIG. Tables 3 and 4 show the characteristic values of the optical filter according to Comparative Example 1 that can be seen from this transmission spectrum.

<Comparative example 2>
Comparison was carried out in the same manner as in Example 1 except that 4-bromophenylphosphonic acid was used in addition to phenylphosphonic acid, 1-J solution was not used, and the amount of other raw materials added was adjusted as shown in Table 1. The light absorbing composition according to Example 2 was prepared. An optical filter according to Comparative Example 2 was produced in the same manner as in Example 1 except that the light-absorbing composition according to Comparative Example 2 was used instead of the light-absorbing composition according to Example 1. The transmission spectrum of the optical filter according to Comparative Example 2 is shown in FIG. Tables 3 and 4 show the characteristic values of the optical filter according to Comparative Example 2 that can be seen from this transmission spectrum.

<Comparative example 3>
The optical filter according to Comparative Example 3 was produced in the same manner as in Comparative Example 2 except that the conditions for producing the optical filter were adjusted so that the thickness of the optical filter exceeded 500 μm. The transmission spectrum of the optical filter according to Comparative Example 3 is shown in FIG. Tables 3 and 4 show the characteristic values of the optical filter according to Comparative Example 3 that can be seen from this transmission spectrum.

As shown in Table 3, in the transmission spectrum of the optical filter according to each example, _{the conditions of 16 ≦ T 550} / T ₄₀₀ and 16 ≦ T ₅₅₀ / T ₈₀₀ are satisfied, and the optical filter according to each example has a condition of 16 ≦ T 550 / T 400 and 16 ≦ T 550 / T 800. It was suggested that light with a wavelength of around 400 nm is sufficiently absorbed and blocked. On the other hand, in the transmission spectrum of the optical filter according to each comparative example, _{the condition of 16 ≦ T 550} / T ₈₀₀ was satisfied, but the condition of 16 ≦ T ₅₅₀ / T ₄₀₀ was not satisfied. It was hard to say that such an optical filter sufficiently absorbs and shields light having a wavelength of around 400 nm. As shown in Table 4, the optical filters according to each embodiment are the above-mentioned (I), (II), (III), (IV), (V), (VI), (VII), and (VIII). The conditions were met. ^{In addition, the first cutoff wavelength λ 50%} _F and the second cutoff wavelength λ ^50% _S in the optical filters according to the comparative examples exist in the range of 405 nm or more and 480 nm or less and the range of 580 nm or more and 720 nm or less, respectively. Was there. On the other hand, the optical filters according to Comparative Examples 1 and 2 did not satisfy the condition (I), and the optical filters according to each Comparative Example did not satisfy the condition (II). ^{In addition, the first cutoff wavelength λ 50%} _F of the optical filter according to Comparative Example 1 was less than 405 nm.

1a, 1b Optical filter 10 Light absorption film 20 Transparent dielectric substrate

Claims (15)

A light-absorbing composition
Compounds containing phosphonic acid and copper components,
Contains UV-absorbing compounds,
In the transmittance spectrum of the light absorbing film obtained by curing the light absorbing composition at an incident angle of 0 degrees, the transmittance T _{400 at} a wavelength of 400 nm, the transmittance T _{550 at} a wavelength of 550 nm, and the transmittance at a wavelength of 800 nm. T ₈₀₀ satisfies the conditions of 16 ≦ T ₅₅₀ / T ₄₀₀ and 16 ≦ T ₅₅₀ / T _800.
Light-absorbing composition. The light-absorbing composition according to claim 1, wherein the ultraviolet-absorbing compound has an absorption maximum wavelength of 330 nm or more and 430 nm or less. The light-absorbing composition according to claim 1 or 2, wherein the transmission spectrum satisfies the following conditions (I), (II), (III), and (IV).
(I) The maximum value of the transmittance in the wavelength range of 300 nm to 380 nm is 1% or less.
(II) The transmittance at a wavelength of 400 nm is 5% or less.
(III) The average value of the transmittance in the wavelength range of 480 nm to 580 nm is 78% or more.
(IV) The average value of the transmittance in the wavelength range of 700 nm to 750 nm is 10% or less. The light-absorbing composition according to claim 3, wherein the transmission spectrum satisfies the condition of the following (V).
(V) The maximum value of the transmittance in the wavelength range of 700 nm to 1000 nm is 10% or less. The transmission spectrum has a first cutoff wavelength of 405 nm or more and 480 nm or less.
The light-absorbing composition according to any one of claims 1 to 4, wherein the first cutoff wavelength is a wavelength that exhibits a transmittance of 50% in the wavelength range of 300 nm to 450 nm in the transmission spectrum. The transmission spectrum has a second cutoff wavelength of 580 nm or more and 720 nm or less.
The light absorbing composition according to any one of claims 1 to 5, wherein the second cutoff wavelength is a wavelength exhibiting a transmittance of 50% in the wavelength range of 550 nm to 750 nm in the transmission spectrum. The light-absorbing composition according to any one of claims 1 to 6, wherein the transmission spectrum satisfies at least one of the following conditions (VI), (VII), and (VIII).
(VI) The maximum value of the transmittance in the wavelength range of 800 nm to 950 nm is 3% or less.
(VII) The maximum value of the transmittance in the wavelength range of 700 nm to 1100 nm is 15% or less.
(VIII) The maximum value of the transmittance in the wavelength range of 700 nm to 1200 nm is 20% or less. It is a light absorption film
Compounds containing phosphonic acid and copper components,
Contains UV-absorbing compounds,
In the transmittance spectrum of the light absorbing film at an incident angle of 0 degrees, the transmittance T _{400 at} a wavelength of 400 nm, the transmittance T _{550 at} a wavelength of 550 nm, and the transmittance T _{800 at a} wavelength of 800 nm are 16 ≦ T ₅₅₀ / T _400. And 16 ≤ T ₅₅₀ / T ₈₀₀ condition,
Light absorption film. The light absorbing film according to claim 8, wherein the ultraviolet absorbing compound has an absorption maximum wavelength of 330 nm or more and 430 nm or less. The light absorption film according to claim 8 or 9, wherein the transmission spectrum satisfies the conditions of (I), (II), (III), and (IV) below.
(I) The maximum value of the transmittance in the wavelength range of 300 nm to 380 nm is 1% or less.
(II) The transmittance at a wavelength of 400 nm is 5% or less.
(III) The average value of the transmittance in the wavelength range of 480 nm to 580 nm is 78% or more.
(IV) The average value of the transmittance in the wavelength range of 700 nm to 750 nm is 10% or less. The light absorption film according to claim 10, wherein the transmission spectrum satisfies the condition of the following (V).
(V) The maximum value of the transmittance in the wavelength range of 700 nm to 1000 nm is 10% or less. The transmission spectrum has a first cutoff wavelength of 405 nm or more and 480 nm or less.
The light absorption film according to any one of claims 8 to 11, wherein the first cutoff wavelength is a wavelength that exhibits a transmittance of 50% in the wavelength range of 300 nm to 450 nm in the transmission spectrum. The transmission spectrum has a second cutoff wavelength of 580 nm or more and 720 nm or less.
The light absorption film according to any one of claims 8 to 12, wherein the second cutoff wavelength is a wavelength that exhibits a transmittance of 50% in the wavelength range of 550 nm to 750 nm in the transmission spectrum. The light absorption film according to any one of claims 8 to 13, wherein the transmission spectrum satisfies at least one of the following conditions (VI), (VII), and (VIII).
(VI) The maximum value of the transmittance in the wavelength range of 800 nm to 950 nm is 3% or less.
(VII) The maximum value of the transmittance in the wavelength range of 700 nm to 1100 nm is 15% or less.
(VIII) The maximum value of the transmittance in the wavelength range of 700 nm to 1200 nm is 20% or less. An optical filter comprising the light absorbing film according to any one of claims 8 to 14.

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