Abstract: A composition for infrared-absorbing layers according to the present invention includes: a compound formed by copper ion and a phosphonic acid represented by the following formula (a); and at least one of a phosphoric acid diester represented by the following formula (b1) and a phosphoric acid monoester represented by the following formula (b2). In the composition, fine particles containing at least the compound are dispersed. A content of the phosphonic acid is less than 2.5 times a total content of the phosphoric acid diester and the phosphoric acid monoester on a molar basis. R1 is an alkyl group with 2 to 4 carbon atoms, R21, R22, and R3 are each a monovalent functional group represented by —(CH2CH2O)nR4 wherein n is an integer of 1 to 25 and R4 is an alkyl group with 6 to 25 carbon atoms.

Abstract: An optical filter (1a) includes a UV-IR-absorbing layer and has the following characteristics (i) to (v) when light with wavelengths of 300 nm to 1200 nm is incident at an incident angle of 0°: (i) an average transmittance of 78% or more in the wavelength range of 450 nm to 600 nm; (ii) a spectral transmittance of 1% or less in the wavelength range of 750 nm to 1080 nm; (iii) a spectral transmittance of 1% or less in the wavelength range of 300 nm to 350 nm; (iv) a decreasing spectral transmittance with increasing wavelength in the wavelength range of 600 nm to 750 nm and a first IR cut-off wavelength in the wavelength range of 620 nm to 680 nm; and (v) an increasing spectral transmittance with increasing wavelength in the wavelength range of 350 nm to 450 nm and a first UV cut-off wavelength in the wavelength range of 380 nm to 430 nm.

Abstract: A composition for infrared-absorbing layers according to the present invention includes: a compound formed by copper ion and a phosphonic acid represented by the following formula (a); and at least one of a phosphoric acid diester represented by the following formula (b1) and a phosphoric acid monoester represented by the following formula (b2). In the composition, fine particles containing at least the compound are dispersed. A content of the phosphonic acid is less than 2.5 times a total content of the phosphoric acid diester and the phosphoric acid monoester on a molar basis. R1 is an alkyl group with 2 to 4 carbon atoms, R21, R22, and R3 are each a monovalent functional group represented by —(CH2CH2O)nR4 wherein n is an integer of 1 to 25 and R4 is an alkyl group with 6 to 25 carbon atoms.

Abstract: An optical filter 1 includes a frame 10 and a light-absorbing film 20. The frame 10 has a through hole 12. The light-absorbing film 20 is disposed to close the through hole 12 and includes a light-absorbing compound. An average Young's modulus of the light-absorbing film 20 measured by continuous stiffness measurement is 2.5 GPa or less.

Abstract: An optical filter 1a has a first transmission spectrum satisfying the following requirements (i), (ii), (iii), and (iv) at 25° C. (i) A minimum of a transmittance in a wavelength range of 450 nm to 600 nm is 70% or more. (ii) A maximum of the transmittance in a wavelength range of 300 nm to 370 nm is 5% or less. (iii) A maximum of the transmittance in a wavelength range of 800 nm to 1000 nm is 5% or less. (iv) A minimum of the transmittance in a wavelength range of 1500 nm to 1700 nm is 60% or more.

Abstract: An optical filter (1a) includes a UV-IR-absorbing layer and has the following characteristics (i) to (v) when light with wavelengths of 300 nm to 1200 nm is incident at an incident angle of 0°: (i) an average transmittance of 78% or more in the wavelength range of 450 nm to 600 nm; (ii) a spectral transmittance of 1% or less in the wavelength range of 750 nm to 1080 nm; (iii) a spectral transmittance of 1% or less in the wavelength range of 300 nm to 350 nm; (iv) a decreasing spectral transmittance with increasing wavelength in the wavelength range of 600 nm to 750 nm and a first IR cut-off wavelength in the wavelength range of 620 nm to 680 nm; and (v) an increasing spectral transmittance with increasing wavelength in the wavelength range of 350 nm to 450 nm and a first UV cut-off wavelength in the wavelength range of 380 nm to 430 nm.

Abstract: An optical filter (1a) includes a light-absorbing layer and satisfies the following requirements (i) to (iii) when light with wavelengths of 300 nm to 1200 nm is incident at an incident angle of 0°: (i) an average transmittance of 78% or more in the wavelength range of 450 nm to 600 nm; (ii) a spectral transmittance of 1% or less in the wavelength range of 750 nm to 1080 nm; and (iii) a decreasing spectral transmittance with increasing wavelength in the wavelength range of 600 nm to 750 nm and a first IR cut-off wavelength in the wavelength range of 620 nm to 680 nm. The requirement (i), the requirement (ii), and the requirement (iii) are satisfied by the light-absorbing layer (10).

Abstract: An optical filter (1a) includes a UV-IR-absorbing layer and has the following characteristics (i) to (v) when light with wavelengths of 300 nm to 1200 nm is incident at an incident angle of 0°: (i) an average transmittance of 78% or more in the wavelength range of 450 nm to 600 nm; (ii) a spectral transmittance of 1% or less in the wavelength range of 750 nm to 1080 nm; (iii) a spectral transmittance of 1% or less in the wavelength range of 300 nm to 350 nm; (iv) a decreasing spectral transmittance with increasing wavelength in the wavelength range of 600 nm to 750 nm and a first IR cut-off wavelength in the wavelength range of 620 nm to 680 nm; and (v) an increasing spectral transmittance with increasing wavelength in the wavelength range of 350 nm to 450 nm and a first UV cut-off wavelength in the wavelength range of 380 nm to 430 nm.

Abstract: An optical filter (1a) includes a light-absorbing layer and satisfies the following requirements (i) to (iii) when light with wavelengths of 300 nm to 1200 nm is incident at an incident angle of 0°: (i) an average transmittance of 78% or more in the wavelength range of 450 nm to 600 nm; (ii) a spectral transmittance of 1% or less in the wavelength range of 750 nm to 1080 nm; and (iii) a decreasing spectral transmittance with increasing wavelength in the wavelength range of 600 nm to 750 nm and a first IR cut-off wavelength in the wavelength range of 620 nm to 680 nm. The requirement (i), the requirement (ii), and the requirement (iii) are satisfied by the light-absorbing layer (10).

Abstract: A UV-IR-absorbing composition according to the present invention includes: an absorber formed by a phosphonic acid represented by the following formula (a) and copper ion, the absorber being dispersed in the UV-IR-absorbing composition; a phosphoric acid ester allowing the absorber to be dispersed; a matrix resin; and an alkoxysilane monomer.

Abstract: The light-absorbing composition according to the present invention includes: a light absorber made of a phosphonic acid represented by the following formula (A) and copper ion; and a curable resin. Alight-absorbing film having desired properties can be provided by curing a coating film of the light-absorbing composition. In the formula (A), R1 to R5 are each independently a hydrogen atom, a halogen atom, a hydroxy group, or a nitro group, and n represents an integer of 1 to 3.

Abstract: A light-absorbing composition according to the present invention includes: a light absorber; a curable resin; and an alkoxysilane. The alkoxysilane includes a dialkoxysilane. Since the alkoxysilane of the light-absorbing composition includes the dialkoxysilane, desired flexibility is likely to be imparted to a light-absorbing layer owing to an organic functional group of the dialkoxysilane while a strong skeleton having a siloxane bond is formed in the light-absorbing layer.

Abstract: A light-absorbing composition includes: a light absorber formed by a phosphonic acid represented by the following formula (a) and copper ion, the light absorber being dispersed in the light-absorbing composition; a phosphoric acid ester allowing the light absorber to be dispersed; and a curable resin. When the light-absorbing composition is applied and cured on one principal surface of a transparent dielectric substrate to form a laminate consisting of a light-absorbing layer being a cured product of the light-absorbing composition and the transparent dielectric substrate, the laminate satisfies predetermined requirements.

Abstract: The liquid composition for optical filters according to the present invention contains: a light absorber; at least one of an alkoxysilane and a hydrolysate of an alkoxysilane; a phosphoric acid ester; and a solvent. The light absorber is formed by a phosphonic acid having an aryl group bonded to a phosphorus atom and copper ion. In the liquid composition, a content of an organic solvent having a relative permittivity of 7 or less at 20° C. is 50 mass % or less.

Abstract: An optical filter (1a) has a thickness of 120 ?m or less and satisfies the following requirements (i), (ii), (iii), and (iv): (i) an average transmittance in a wavelength range of 450 nm to 600 nm is 74% or more; (ii) a maximum transmittance in a wavelength range of 750 nm to 1080 nm is 1% or less; (iii) an infrared cut-off wavelength being a wavelength which lies in a wavelength range of 550 nm to 700 nm and at which a spectral transmittance is 50% is in a range of 600 nm to 680 nm; and (iv) an ultraviolet cut-off wavelength being a wavelength which lies in a wavelength range of 350 nm to 500 nm and at which a spectral transmittance is 50% is in a range of 350 nm to 420 nm.

Abstract: The infrared cut filter of the present invention includes an organic dye-containing layer and a copper phosphonate-containing layer containing fine particles of copper phosphonate. The organic dye-containing layer contains an organic dye so as to have a spectral transmittance that decreases from 70% or more to 50% or less with increasing wavelength in a wavelength range between a wavelength 50 nm shorter than a cut-off wavelength of the infrared cut filter and a wavelength 50 nm longer than the cut-off wavelength of the infrared cut filter.

Abstract: A composition for infrared-absorbing layers according to the present invention includes: a compound formed by copper ion and a phosphonic acid represented by the following formula (a); and at least one of a phosphoric acid diester represented by the following formula (b1) and a phosphoric acid monoester represented by the following formula (b2). In the composition, fine particles containing at least the compound are dispersed. A content of the phosphonic acid is less than 2.5 times a total content of the phosphoric acid diester and the phosphoric acid monoester on a molar basis. R1 is an alkyl group with 2 to 4 carbon atoms, R21, R22, and R3 are each a monovalent functional group represented by —(CH2CH2O)nR4 wherein n is an integer of 1 to 25 and R4 is an alkyl group with 6 to 25 carbon atoms.

Abstract: An infrared-absorbing composition according to the present invention includes: an infrared absorber formed by a phosphonic acid represented by the following formula (a) and copper ion; and a phosphoric acid ester allowing the infrared absorber to be dispersed. The phosphoric acid ester includes at least one of a phosphoric acid diester and a phosphoric acid monoester. R1 is a phenyl group or a phenyl group in which at least one hydrogen atom is substituted by a halogen atom. When molar contents of the phosphonic acid, the copper ion, and the phosphoric acid ester are respectively defined as CA mol, CC mol, and CE mol and a total molar content of reactive hydroxy groups is defined as CH mol, the relations CA/CE<1 and CH/CC>1.95 are satisfied.

Abstract: An infrared-cut filter (1a) includes a near-infrared reflecting film (20) and an absorbing film (30). The near-infrared reflecting film (20) and the absorbing film (30) have the following features (A) to (E); (A) 700 nm??HR (0°, 70%)<?HR (0°, 20%)?770 nm; (B) 650 nm??HR (40°, 70%)<?HR (40°, 20%)?720 nm; (C) ?HA (40°, 20%)<?HR (40°, 20%); (D) the spectral transmittance of light incident on the absorbing film (30) is 15% or less at ?HR (0°, 20%) and ?HR (40°, 20%); and (E) an average of the spectral transmittance of light incident on the near-infrared reflecting film (20) and an average of the spectral transmittance of light incident on the absorbing film (30) are 75% or more in the wavelength range of 450 to 600 nm.

Abstract: A light-absorbing composition according to the present invention contains a light absorber formed by a particular phosphonic acid and copper ion and an alkoxysilane monomer for dispersing the light absorber, and does not contain a phosphoric acid ester having a polyoxyalkyl group. The light-absorbing composition contains the alkoxysilane monomer in such a manner that a normalized transmittance spectrum has a wavelength band in which the spectral transmittance is 70% or more in a wavelength range from 300 nm to 700 nm and the difference between the maximum value and the minimum value of the wavelength in the wavelength band is 100 nm or more.