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Light absorbing composition and optical filter

A technology of composition and light absorption, applied in the direction of instruments, optics, optical components, etc., can solve problems such as existence

Active Publication Date: 2020-06-16
NIPPON SHEET GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, human visual acuity exists only in the region of visible light

Method used

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  • Light absorbing composition and optical filter
  • Light absorbing composition and optical filter
  • Light absorbing composition and optical filter

Examples

Experimental program
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preparation example Construction

[0081] An example of the production method of the light-absorbing composition of the present invention will be described. For example, the light-absorbing composition contains R in formula (a) 11 In the case of a phosphonic acid (aryl-based phosphonic acid) of an aryl group, a nitroaryl group, a hydroxyaryl group, or a halogenated aryl group in which at least one hydrogen atom in the aryl group is replaced by a halogen atom, prepare liquid D as follows . Copper salts such as copper acetate monohydrate are added to predetermined solvents such as tetrahydrofuran (THF) and stirred to prepare liquid A which is a solution of copper salts. Next, an aryl-based phosphonic acid is added to a predetermined solvent such as THF and stirred to prepare a liquid B. When using two or more aryl-based phosphonic acids as the phosphonic acid represented by formula (a), each aryl-based phosphonic acid can be added to a predetermined solvent such as THF and then stirred, and the aryl-based phosp...

Embodiment 1

[0117] 1.125 g of copper acetate monohydrate and 60 g of tetrahydrofuran (THF) were mixed, stirred for 3 hours, and A liquid was obtained. Next, 10 g of THF was added to 0.447 g of phenylphosphonic acid, followed by stirring for 30 minutes to obtain liquid B-1. Furthermore, 10 g of THF was added to 0.670 g of 4-bromophenylphosphonic acid, and it stirred for 30 minutes, and obtained liquid B-2. Next, the B-1 liquid and the B-2 liquid were mixed and stirred for 1 minute, and 5.415 g of methyltriethoxysilane (MTES: manufactured by Shin-Etsu Chemical Co., Ltd.) and tetraethoxysilane (TEOS: special grade manufactured by Kishida Chemical Co., Ltd.) were added. ) 1.775g and further stirred for 1 minute to obtain liquid B. While stirring liquid A, add liquid B to liquid A, and stir at room temperature for 1 minute. Next, after adding 40 g of toluene to this solution, it stirred at room temperature for 1 minute, and obtained C liquid. This liquid C was put into a flask, and was deso...

Embodiment 2

[0125] The normalized transmittance spectra of the filters of Examples 2 and 10 are shown in Figure 7 and Figure 8 . In addition, the optical characteristics read from the normalized transmittance spectra of the optical filters of Examples 2 to 10 are shown in Table 7. As shown in Table 7, it can be seen that the optical filter has good characteristics even if the addition amount of MTES and the addition amount of TEOS in the light-absorbing composition are changed within the predetermined range. The amount of the alkoxysilane monomer added to the light-absorbing composition of Example 10 was about 6 times the amount of the alkoxysilane monomer added to the light-absorbing composition of Example 2 on a mass basis. Therefore, even if a relatively large amount of alkoxysilane monomer is included in the light-absorbing composition beyond the minimum required for dispersing the light-absorbing agent, it is considered that there is no problem in producing an optical filter with...

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Abstract

A light absorbing composition contains a light absorbent which is formed from a specific phosphonic acid and a copper ion, and an alkoxy silane monomer in which the light absorbent is dispersed; but this light absorbing composition does not contain a phosphoric acid ester which has a polyoxyalkyl group. This light absorbing composition is configured to contain the alkoxy silane monomer so that: the normalized transmittance spectrum has a wavelength range wherein the spectral transmittance is 70% or higher at a wavelength of from 300 nm to 700 nm; and the difference between the maximum wavelength and the minimum wavelength in the above-described wavelength range is 100 nm or more.

Description

technical field [0001] The present invention relates to light-absorbing compositions and filters. Background technique [0002] In imaging devices using solid-state imaging elements such as CCD (Charge Coupled Device, charge-coupled device) or CMOS (Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor), in order to obtain an image with good color reproducibility, the solid-state imaging element There are various filters on the front. Generally, a solid-state imaging element has spectral sensitivity in a wide wavelength range from an ultraviolet region to an infrared region. On the other hand, human visual acuity exists only in the region of visible light. Therefore, in order to make the spectral sensitivity of a solid-state imaging device in an imaging device close to human visual sensitivity, it is known to arrange a filter for shielding infrared rays or ultraviolet rays in front of the solid-state imaging device. [0003] As such an optical f...

Claims

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Application Information

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IPC IPC(8): G02B5/22C08K5/5317C08L83/04
CPCC08K5/5317G02B5/22C08K5/098C09D183/04C08L83/02C08L83/04C08G77/18C08K5/56
Inventor 久保雄一郎
Owner NIPPON SHEET GLASS CO LTD