Composition, film, laminate, infrared transmitting filter, solid image pickup element, and infrared sensor
Provided is a composition with which a film that allows transmission of infrared light in a state where noise generated from visible light is small can be formed. In addition, provided are a film, a laminate, an infrared transmitting filter, a solid image pickup element, and an infrared sensor. This composition includes: a coloring material that allows transmission of infrared light and shields visible light; an infrared absorber; and a curable compound, in which the infrared absorber includes a material that shields light in a wavelength range of longer than 1000 nm and 1200 nm or shorter. In the composition, a ratio A/B of a minimum value A of an absorbance of the composition in a wavelength range of 400 to 1100 nm to a maximum value B of an absorbance of the composition in a wavelength range of 1400 to 1500 nm is 4.5 or higher.
1. A composition comprising:
a coloring material that allows transmission of infrared light and shields visible light;
an infrared absorber; and
a curable compound,
wherein:
the infrared absorber includes a material that shields light in a wavelength range of longer than 1000 nm and 1200 nm or shorter, and further includes a compound having an absorption maximum in a wavelength range of longer than 900 nm and 1000 nm or shorter,
the material that shields light in a wavelength range of longer than 1000 nm and 1200 nm or shorter is a compound having an absorption maximum in a wavelength range of longer than 1000 nm and 1200 nm or shorter, and
a ratio AB of a minimum value A of an absorbance of the composition in a wavelength range of 400 to 1100 nm to a maximum value B of an absorbance of the composition in a wavelength range of 1400 to 1500 nm is 4.5 or higher.
2. The composition according to claim 1 ,
wherein in the compound having an absorption maximum in a wavelength range of longer than 1000 nm and 1200 nm or shorter, a ratio absorbance A max /absorbance A 1400 of an absorbance A max at the absorption maximum to an absorbance A 1400 at a wavelength of 1400 nm is 4.5 or higher.
3. The composition according to claim 1 ,
wherein the material that shields light in a wavelength range of longer than 1000 nm and 1200 nm or shorter is at least one selected from a diiminium compound, a squarylium compound, a croconium compound, a cyanine compound, a dithiol metal complex, a lanthanum boride compound, flat metal particles, a quantum dot, or a rare earth-containing ceramic.
4. The composition according to claim 1 ,
wherein the infrared absorber further includes a compound having an absorption maximum in a wavelength range of longer than 700 nm and 900 nm or shorter.
5. A film which is formed using the composition according to claim 1 .
6. The film according to claim 5 ,
wherein a maximum value of a light transmittance of the film in a thickness direction in a wavelength range of 400 to 1100 nm is 20% or lower, and
a minimum value of a light transmittance of the film in the thickness direction in a wavelength range of 1400 to 1500 nm is 70% or higher.
7. A laminate comprising:
a layer including a coloring material that allows transmission of infrared light and shields visible light; and
a layer including a material that shields light in a wavelength range of longer than 1000 nm and 1200 nm or shorter,
wherein a ratio AB of a minimum value A of an absorbance of the laminate in a wavelength range of 400 to 1100 nm to a maximum value B of an absorbance of the laminate in a wavelength range of 1400 to 1500 nm is 4.5 or higher.
8. The laminate according to claim 7 ,
wherein a maximum value of a light transmittance of the laminate in a thickness direction in a wavelength range of 400 to 1100 nm is 20% or lower, and
a minimum value of a light transmittance of the laminate in the thickness direction in a wavelength range of 1400 to 1500 nm is 70% or higher.
9. An infrared transmitting filter comprising:
the film according to claim 5 .
10. A solid image pickup element comprising:
the film according to claim 5 .
11. An infrared sensor comprising:
the film according to claim 5 .