WO2017135359A1 - 近赤外線吸収色素、光学フィルタおよび撮像装置 - Google Patents
近赤外線吸収色素、光学フィルタおよび撮像装置 Download PDFInfo
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- WO2017135359A1 WO2017135359A1 PCT/JP2017/003734 JP2017003734W WO2017135359A1 WO 2017135359 A1 WO2017135359 A1 WO 2017135359A1 JP 2017003734 W JP2017003734 W JP 2017003734W WO 2017135359 A1 WO2017135359 A1 WO 2017135359A1
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- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- XVNRSQASUCMHGX-UHFFFAOYSA-N O[Si](O)(O)O.OP(O)(O)=O Chemical compound O[Si](O)(O)O.OP(O)(O)=O XVNRSQASUCMHGX-UHFFFAOYSA-N 0.000 description 1
- WYNCHZVNFNFDNH-UHFFFAOYSA-N Oxazolidine Chemical compound C1COCN1 WYNCHZVNFNFDNH-UHFFFAOYSA-N 0.000 description 1
- YNPNZTXNASCQKK-UHFFFAOYSA-N Phenanthrene Natural products C1=CC=C2C3=CC=CC=C3C=CC2=C1 YNPNZTXNASCQKK-UHFFFAOYSA-N 0.000 description 1
- 239000004962 Polyamide-imide Substances 0.000 description 1
- 229920000265 Polyparaphenylene Polymers 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 230000032900 absorption of visible light Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 125000002393 azetidinyl group Chemical group 0.000 description 1
- 125000004069 aziridinyl group Chemical group 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- XJHABGPPCLHLLV-UHFFFAOYSA-N benzo[de]isoquinoline-1,3-dione Chemical compound C1=CC(C(=O)NC2=O)=C3C2=CC=CC3=C1 XJHABGPPCLHLLV-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- NNTOJPXOCKCMKR-UHFFFAOYSA-N boron;pyridine Chemical compound [B].C1=CC=NC=C1 NNTOJPXOCKCMKR-UHFFFAOYSA-N 0.000 description 1
- 239000005388 borosilicate glass Substances 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- FJDQFPXHSGXQBY-UHFFFAOYSA-L caesium carbonate Chemical compound [Cs+].[Cs+].[O-]C([O-])=O FJDQFPXHSGXQBY-UHFFFAOYSA-L 0.000 description 1
- 229910000024 caesium carbonate Inorganic materials 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 125000001309 chloro group Chemical group Cl* 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- GBRBMTNGQBKBQE-UHFFFAOYSA-L copper;diiodide Chemical compound I[Cu]I GBRBMTNGQBKBQE-UHFFFAOYSA-L 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- DWYMPOCYEZONEA-UHFFFAOYSA-L fluoridophosphate Chemical compound [O-]P([O-])(F)=O DWYMPOCYEZONEA-UHFFFAOYSA-L 0.000 description 1
- 239000005303 fluorophosphate glass Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 239000005457 ice water Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- FMKOJHQHASLBPH-UHFFFAOYSA-N isopropyl iodide Chemical compound CC(C)I FMKOJHQHASLBPH-UHFFFAOYSA-N 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- WQMNNHNWITXOAH-UHFFFAOYSA-M magnesium;prop-1-ene;bromide Chemical compound [Mg+2].[Br-].CC=[CH-] WQMNNHNWITXOAH-UHFFFAOYSA-M 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- UYZWCDKHEOBGLW-UHFFFAOYSA-N n-butylhexan-1-amine Chemical compound CCCCCCNCCCC UYZWCDKHEOBGLW-UHFFFAOYSA-N 0.000 description 1
- HRRDCWDFRIJIQZ-UHFFFAOYSA-N naphthalene-1,8-dicarboxylic acid Chemical compound C1=CC(C(O)=O)=C2C(C(=O)O)=CC=CC2=C1 HRRDCWDFRIJIQZ-UHFFFAOYSA-N 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- GYHFUZHODSMOHU-UHFFFAOYSA-N nonanal Chemical compound CCCCCCCCC=O GYHFUZHODSMOHU-UHFFFAOYSA-N 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- WCPAKWJPBJAGKN-UHFFFAOYSA-N oxadiazole Chemical compound C1=CON=N1 WCPAKWJPBJAGKN-UHFFFAOYSA-N 0.000 description 1
- AUONHKJOIZSQGR-UHFFFAOYSA-N oxophosphane Chemical compound P=O AUONHKJOIZSQGR-UHFFFAOYSA-N 0.000 description 1
- 238000000016 photochemical curing Methods 0.000 description 1
- 239000001007 phthalocyanine dye Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 229920000412 polyarylene Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 125000004076 pyridyl group Chemical group 0.000 description 1
- 230000001846 repelling effect Effects 0.000 description 1
- 230000003362 replicative effect Effects 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 125000004436 sodium atom Chemical group 0.000 description 1
- 239000012279 sodium borohydride Substances 0.000 description 1
- 229910000033 sodium borohydride Inorganic materials 0.000 description 1
- 235000010288 sodium nitrite Nutrition 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical class O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- KKVTYAVXTDIPAP-UHFFFAOYSA-M sodium;methanesulfonate Chemical compound [Na+].CS([O-])(=O)=O KKVTYAVXTDIPAP-UHFFFAOYSA-M 0.000 description 1
- 125000005504 styryl group Chemical group 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- DPKBAXPHAYBPRL-UHFFFAOYSA-M tetrabutylazanium;iodide Chemical compound [I-].CCCC[N+](CCCC)(CCCC)CCCC DPKBAXPHAYBPRL-UHFFFAOYSA-M 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 150000003573 thiols Chemical class 0.000 description 1
- ANRHNWWPFJCPAZ-UHFFFAOYSA-M thionine Chemical compound [Cl-].C1=CC(N)=CC2=[S+]C3=CC(N)=CC=C3N=C21 ANRHNWWPFJCPAZ-UHFFFAOYSA-M 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D217/00—Heterocyclic compounds containing isoquinoline or hydrogenated isoquinoline ring systems
- C07D217/02—Heterocyclic compounds containing isoquinoline or hydrogenated isoquinoline ring systems with only hydrogen atoms or radicals containing only carbon and hydrogen atoms, directly attached to carbon atoms of the nitrogen-containing ring; Alkylene-bis-isoquinolines
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B23/00—Methine or polymethine dyes, e.g. cyanine dyes
- C09B23/14—Styryl dyes
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D209/00—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom
- C07D209/02—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom condensed with one carbocyclic ring
- C07D209/04—Indoles; Hydrogenated indoles
- C07D209/08—Indoles; Hydrogenated indoles with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, directly attached to carbon atoms of the hetero ring
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D235/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings
- C07D235/02—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings condensed with carbocyclic rings or ring systems
- C07D235/04—Benzimidazoles; Hydrogenated benzimidazoles
- C07D235/06—Benzimidazoles; Hydrogenated benzimidazoles with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached in position 2
- C07D235/08—Radicals containing only hydrogen and carbon atoms
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D235/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings
- C07D235/02—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings condensed with carbocyclic rings or ring systems
- C07D235/04—Benzimidazoles; Hydrogenated benzimidazoles
- C07D235/24—Benzimidazoles; Hydrogenated benzimidazoles with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached in position 2
- C07D235/30—Nitrogen atoms not forming part of a nitro radical
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D237/00—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings
- C07D237/26—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings condensed with carbocyclic rings or ring systems
- C07D237/28—Cinnolines
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D333/00—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom
- C07D333/50—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom condensed with carbocyclic rings or ring systems
- C07D333/52—Benzo[b]thiophenes; Hydrogenated benzo[b]thiophenes
- C07D333/62—Benzo[b]thiophenes; Hydrogenated benzo[b]thiophenes with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to carbon atoms of the hetero ring
- C07D333/66—Nitrogen atoms not forming part of a nitro radical
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
- C07D487/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
- C07D487/04—Ortho-condensed systems
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D519/00—Heterocyclic compounds containing more than one system of two or more relevant hetero rings condensed among themselves or condensed with a common carbocyclic ring system not provided for in groups C07D453/00 or C07D455/00
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3412—Heterocyclic compounds having nitrogen in the ring having one nitrogen atom in the ring
- C08K5/3415—Five-membered rings
- C08K5/3417—Five-membered rings condensed with carbocyclic rings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3412—Heterocyclic compounds having nitrogen in the ring having one nitrogen atom in the ring
- C08K5/3432—Six-membered rings
- C08K5/3437—Six-membered rings condensed with carbocyclic rings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3442—Heterocyclic compounds having nitrogen in the ring having two nitrogen atoms in the ring
- C08K5/3445—Five-membered rings
- C08K5/3447—Five-membered rings condensed with carbocyclic rings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
- C08K5/3472—Five-membered rings
- C08K5/3475—Five-membered rings condensed with carbocyclic rings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L101/00—Compositions of unspecified macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B57/00—Other synthetic dyes of known constitution
- C09B57/007—Squaraine dyes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D179/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09D161/00 - C09D177/00
- C09D179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C09D179/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/22—Absorbing filters
- G02B5/223—Absorbing filters containing organic substances, e.g. dyes, inks or pigments
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
- H01L27/144—Devices controlled by radiation
- H01L27/146—Imager structures
- H01L27/14601—Structural or functional details thereof
- H01L27/1462—Coatings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
- H01L27/144—Devices controlled by radiation
- H01L27/146—Imager structures
- H01L27/14601—Structural or functional details thereof
- H01L27/14625—Optical elements or arrangements associated with the device
- H01L27/14627—Microlenses
Definitions
- the present invention relates to a near-infrared absorbing dye that transmits visible light and blocks near-infrared light, an optical filter, and an imaging device including the optical filter.
- an image pickup apparatus using a solid-state image pickup device such as a CCD or CMOS image sensor mounted on a digital still camera or the like, in order to reproduce a color tone well and obtain a clear image, it transmits visible light, and near infrared.
- An optical filter near infrared cut filter
- a sharp blocking property against near-infrared light can be obtained by using a dye having high absorption in the near-infrared region and high transparency in the visible region. Good color reproducibility is obtained.
- Patent Documents 2 and 3 various squarylium dyes having a new structure have been proposed to increase the transmittance of visible light, but have not yet reached a satisfactory level.
- Patent Document 4 an optical filter using a phthalocyanine dye in combination with a squarylium dye has been proposed (Patent Document 4), but a technique for increasing the transmittance for light having a wavelength of 430 to 550 nm, in particular, has been disclosed. Absent. Furthermore, since Patent Document 4 uses a plurality of types of dyes, there is a problem in that absorption of visible light increases secondaryly, and high visible light transmittance cannot be obtained.
- the present invention can realize an excellent light-shielding property for near-infrared light, and has high visible light transmittance, in particular, increased transmittance of light having a wavelength of 430 to 550 nm, a near-infrared absorbing dye, an optical filter, and
- An object of the present invention is to provide an imaging apparatus that uses the optical filter and has excellent color reproducibility.
- the near-infrared absorbing dye according to the present invention is characterized in that absorption characteristics measured by dissolving in dichloromethane satisfy the requirements (i-1) to (i-3).
- (I-1) In an absorption spectrum with a wavelength of 400 to 800 nm, it has a maximum absorption wavelength ⁇ max in a wavelength region of 670 nm or more.
- (I-2) The following relational expression holds between the maximum extinction coefficient ⁇ A for light with a wavelength of 430 to 550 nm and the maximum extinction coefficient ⁇ B for light with a wavelength of 670 nm or longer.
- the near-infrared absorbing dye according to the present invention is characterized by comprising a squarylium compound represented by the formula (AI).
- a squarylium compound represented by the formula (AI) Each ring Z is independently a 5-membered or 6-membered ring having 0 to 3 heteroatoms in the ring and optionally substituted; R 1 and R 2 , R 2 and R 3 , and R 1 and the carbon atom or hetero atom constituting ring Z are connected to each other to form a heterocycle A, heterocycle B and heterocycle C together with a nitrogen atom.
- R 1 and R 2 each independently contains a hydrogen atom or an unsaturated bond, a heteroatom, a saturated or unsaturated ring structure between carbon atoms, and when a heterocycle is not formed
- Each of R 3 independently represents a hydrogen atom, a halogen atom, a hydroxyl group, or an alkyl group or an alkoxy group that may contain a hetero atom between carbon atoms.
- R 4 each independently represents a hydrogen atom, a halogen atom, a hydroxyl group, or an alkyl group or an alkoxy group that may contain a hetero atom between carbon atoms.
- the near-infrared absorbing dye according to the present invention is characterized by comprising a squarylium compound represented by the formula (AII).
- AII a squarylium compound represented by the formula (AII):
- Each R 6 independently represents a hydrogen atom or a hydrocarbon group which may contain an unsaturated bond, a heteroatom, a saturated or unsaturated ring structure between carbon atoms, and may be substituted;
- R 7 each independently represents a hydrogen atom, a halogen atom, a hydroxyl group or an alkyl group or an alkoxy group which may contain a hetero atom between carbon atoms,
- R 8 is independently a halogen atom, a hydroxyl group, an alkoxy group having 1 to 12 carbon atoms, an acyl group or acyloxy group having 1 to 12 carbon atoms, a perfluoroalkyl group having 1 to 12 carbon atoms, or —SO 2.
- R 9 group (R 9 represents an optionally substituted alkyl group having 1 to 12 carbon atoms)
- X 2 represents a divalent hydrocarbon group which may contain an unsaturated bond, a hetero atom, a saturated or unsaturated ring structure between carbon atoms, and may be substituted.
- an optical filter according to the present invention includes an absorption layer containing the near-infrared absorbing dye and a resin.
- an imaging apparatus according to the present invention includes a solid-state imaging device, an imaging lens, and the optical filter.
- the present invention provides an optical filter that is excellent in blocking property to near-infrared light and has a high transmittance for light in the visible range, particularly in the wavelength range of 430 to 550 nm. Further, by mounting the optical filter, an imaging device having excellent color reproducibility can be obtained.
- the optical filter may be abbreviated as “NIR filter”, the near-infrared absorbing dye as “NIR dye”, and the ultraviolet absorbing dye as “UV dye”.
- the NIR filter according to one embodiment of the present invention (hereinafter also referred to as “the present filter”) has one or more absorption layers.
- each layer may be the same or different.
- the absorption layer is composed of two or more layers, an example in which one layer is a near infrared absorption layer made of a resin containing a NIR dye and the other layer is an ultraviolet absorption layer made of a resin containing a UV dye is given.
- the absorption layer itself may be a substrate (resin substrate).
- This filter may have one or more selective wavelength shielding layers that shield light in a specific wavelength range.
- each layer may be the same or different.
- the selective wavelength shielding layer has two or more layers, there is an example in which one layer is a near infrared shielding layer that shields at least near infrared light, and the other layer is an ultraviolet shielding layer that shields at least ultraviolet light. Can be mentioned.
- This filter may further have a transparent substrate.
- the absorption layer and the selective wavelength shielding layer may be provided on the same main surface of the transparent substrate, or may be provided on different main surfaces.
- the stacking order is not particularly limited.
- the filter may further include other functional layers such as an antireflection layer.
- FIG. 1A is an example including an absorption layer 11
- FIG. 1B is an example including an absorption layer 11 and a selective wavelength shielding layer 12
- FIG. 1C is a transparent substrate 13.
- the absorption layer 11 may be configured as an absorption substrate.
- the absorption layer 11 may include two layers, a near-infrared absorption layer and an ultraviolet absorption layer.
- a configuration in which the near-infrared absorbing layer and the ultraviolet absorbing layer are provided in this order on the selective wavelength shielding layer 12 or a configuration in which these two layers are provided in the reverse order may be employed.
- FIG.1 (c) the structure provided in order of a near-infrared absorption layer and an ultraviolet absorption layer on the transparent base material 13 and the structure provided with these two layers in reverse order may be sufficient.
- FIG. 1D shows an example in which the absorption layer 11 is provided on one main surface of the transparent substrate 13, and the selective wavelength shielding layers 12a and 12b are provided on the other main surface and the main surface of the absorption layer 11, respectively. It is.
- FIG. 1E shows an absorption layer 11a on one main surface of the transparent substrate 13, an absorption layer 11b on the other main surface, and a selective wavelength shielding layer 12a on the main surface of the absorption layer 11a.
- the selective wavelength shielding layer 12b is provided on the main surface of the layer 11b.
- the selective wavelength shielding layers 12a and 12b have the property of reflecting ultraviolet light and near infrared light and transmitting visible light by these layers.
- the selective wavelength shielding layer 12a may reflect ultraviolet light and first near infrared light
- the selective wavelength shielding layer 12b may reflect ultraviolet light and second near infrared light.
- FIG. 1 (f) is an example in which an antireflection layer 14 is provided at the position of the selective wavelength shielding layer 12b on the main surface of the absorption layer 11 of the filter shown in FIG. 1 (d).
- an antireflection layer may be provided on the absorption layer, and the antireflection layer may cover the entire side surface of the absorption layer (not shown) in order to enhance the moistureproof effect of the absorption layer.
- the selective reflection shielding layer will be described as a “reflection layer” having a reflection function.
- This filter only needs to satisfy (iii-1), and preferably satisfies (iii-1) and (iii-2). In addition to (iii-1) and (iii-2), (iii-3) to It is more preferable to satisfy at least one of (iii-6), and it is even more preferable to satisfy all (iii-1) to (iii-6).
- (Iii-1) to (iii-5) are requirements in the spectral transmittance curve at an incident angle of 0 °.
- the average transmittance of light having a wavelength of 430 to 550 nm is 90% or more, and the minimum transmittance of light having a wavelength of 430 to 550 nm is 75% or more.
- the average transmittance of light having a wavelength of 430 to 480 nm is 87% or more.
- the average transmittance of light having a wavelength of 600 to 700 nm is 25% or more.
- (Iii-4) The average transmittance of light having a wavelength of 350 to 395 nm is 2% or less.
- the average transmittance of light having a wavelength of 710 to 1100 nm is 2% or less.
- (Iii-6) Absolute difference between the transmittance of light having a wavelength of 600 to 700 nm in the spectral transmittance curve at an incident angle of 0 ° and the transmittance of light having a wavelength of from 600 nm to 700 nm in the spectral transmittance curve at an incident angle of 30 °
- the average value (hereinafter referred to as “the average transmittance shift amount of light having a wavelength of 600 to 700 nm”) is 7% / nm or less.
- the average transmittance of light having a wavelength of 430 to 550 nm is preferably 91% or more, and more preferably 92% or more.
- the minimum transmittance of light having a wavelength of 430 to 550 nm is preferably 77% or more, and more preferably 80% or more.
- the average transmittance of light having a wavelength of 430 to 480 nm in this filter is preferably 88% or more, more preferably 89% or more, and further preferably 90% or more.
- the average transmittance of light having a wavelength of 600 to 700 nm is preferably 30% or more.
- the average transmittance of light having a wavelength of 350 to 395 nm is preferably 1.5% or less, more preferably 1% or less, and further preferably 0.5% or less.
- the average transmittance of light having a wavelength of 710 to 1100 nm is preferably 1% or less, more preferably 0.5% or less, and further preferably 0.3% or less.
- the average transmittance shift amount of light having a wavelength of 600 to 700 nm is preferably 3% / nm or less, and more preferably 2% / nm or less.
- the absorption layer contains a near-infrared absorbing dye (A) and a transparent resin (B). Typically, a layer in which the near-infrared absorbing dye (A) is uniformly dissolved or dispersed in the transparent resin (B). Or (resin) substrate.
- the absorption layer may further contain an ultraviolet absorbing dye (U). Further, as described above, a plurality of absorption layers may be provided.
- the near-infrared absorbing dye (A) is hereinafter also referred to as “dye (A)”
- the ultraviolet absorbing dye (U) is hereinafter also referred to as “dye (U)”.
- the thickness of the absorption layer is preferably 0.1 to 100 ⁇ m.
- the total thickness of each layer is preferably 0.1 to 100 ⁇ m. If the thickness is less than 0.1 ⁇ m, the desired optical characteristics may not be sufficiently exhibited. If the thickness exceeds 100 ⁇ m, the flatness of the layer may be lowered, and the in-plane variation of the absorptance may occur.
- the thickness of the absorption layer is more preferably 0.3 to 50 ⁇ m.
- other functional layers such as a reflection layer and an antireflection layer, are provided, depending on the material, if the absorption layer is too thick, cracking or the like may occur. Therefore, the thickness of the absorption layer is more preferably 0.3 to 10 ⁇ m.
- the dye (A) satisfies the absorption characteristics (i-1) to (i-3) measured by being dissolved in dichloromethane.
- I-1 The absorption spectrum of light having a wavelength of 400 to 800 nm has a maximum absorption wavelength ⁇ max in a wavelength region of 670 nm or more.
- I-2) The following relational expression holds between the maximum extinction coefficient ⁇ A for light with a wavelength of 430 to 550 nm and the maximum extinction coefficient ⁇ B for light with a wavelength of 670 nm or longer.
- the dye (A) has at least one of absorption characteristics measured by dissolving in dichloromethane (i-4) to (i-7) More preferably, at least two are more preferable, at least three are more preferable, and all are particularly preferable.
- the wavelengths at which the transmittance is 80% and 10% on the shorter wavelength side than the maximum absorption wavelength ⁇ max when the transmittance at the maximum absorption wavelength ⁇ max is 1% are the wavelengths.
- the maximum value of the slope ( ⁇ T / ⁇ ) of the spectral transmittance curve between the wavelength ⁇ 80 and the wavelength ⁇ 10 is ⁇ 0.5 [% / nm] or less. It is. (I-5)
- the transmittance at the maximum absorption wavelength ⁇ max is 1%
- the transmittance of light having a wavelength of 410 to 460 nm (T (410-460) ) is 93.0% or more. is there.
- ⁇ max is preferably 680 to 770 nm, more preferably 680 to 750 nm, and even more preferably 690 to 730 nm.
- ⁇ B / ⁇ A ⁇ 70 is more preferable.
- T Avg T Avg.
- (430-460) is preferably 95.0% or more, more preferably 96.0% or more, and further preferably 96.5% or more.
- the maximum value of ( ⁇ T / ⁇ ) is preferably ⁇ 0.52 [% / nm] or less, and more preferably ⁇ 0.55 [% / nm] or less.
- T (410-460) is preferably 93.5% or more, more preferably 94.0% or more.
- ⁇ 97 is preferably 455 nm or less, more preferably 452 nm or less, and even more preferably 445 nm or less.
- ⁇ max - ⁇ 80 is preferably 75 nm or less, and more preferably 73 nm or less.
- the visible light transmittance is higher than that of the conventional one while having a good near-infrared shielding property, and having a wavelength of 430 to 550 nm.
- An optical filter having a high light transmittance is obtained, and further, an optical filter having a high light transmittance at a wavelength of 430 to 460 nm is obtained.
- predetermined near infrared light can be sufficiently shielded.
- the blue visible light transmittance can be particularly increased.
- a steep change in transmittance can be obtained between the long-wavelength side region and the near infrared region in the visible region, and the red-based visible light transmittance can be increased and good Realizing near-infrared shielding characteristics.
- satisfying (i-5) it is possible to increase the visible light transmittance of blue color in particular.
- satisfying (i-6) the blue visible light transmittance can be further increased.
- satisfying (i-7) a steep change in transmittance can be obtained between the long wavelength side region in the visible region and the near infrared region, and a good near infrared shielding characteristic can be realized.
- the dye (A) is not particularly limited as long as it satisfies the above conditions.
- examples of the dye (A) include squarylium compounds, for example, squarylium compounds represented by formula (AI) or formula (AII) (described later).
- the NIR dye comprising the compound represented by formula (AI) is also referred to as NIR dye (AI)
- the NIR dye comprising the compound represented by (AII) is also referred to as NIR dye (AII).
- an NIR dye composed of a compound represented by the formula (A1-1) described later is also referred to as an NIR dye (A1-1)
- a group represented by the formula (1n) is also referred to as a group (1n), and the same applies to groups represented by other formulas.
- the NIR dye (AI) has a squarylium skeleton at the center of the molecular structure, and one benzene ring is bonded to each side of the squarylium skeleton.
- the benzene ring is bonded to a nitrogen atom at the 4-position, and It consists of a squarylium compound having a fused ring structure in which a heterocycle containing carbon atoms at the 2nd and 3rd positions is formed on the left and right.
- ring Z is a 5-membered or 6-membered ring having 0-3 heteroatoms in the ring.
- the heteroatom may be any of a nitrogen atom, a sulfur atom, and an oxygen atom, but a nitrogen atom and a sulfur atom are preferable from the viewpoint of increasing visible light transmittance.
- ring Z examples include pyrrolidine ring, piperidine ring, piperazine ring, pyrrole ring, thiophene ring, imidazole ring, pyrazole ring, thiazole ring, isothiazole ring, oxazole ring, isoxazole ring, pyridine ring, pyrimidine ring, pyridazine A ring, a pyrazine ring, a triazine ring, a triazole ring, and the like.
- aromatic heterocycles are preferred because they can delocalize the electrons of the heteroatom, stabilize the energy level of the ground state of the lone pair, and improve the visible light transmittance.
- a pyridine ring, pyrimidine ring, pyridazine ring, pyrrole ring, thiophene ring, imidazole ring, pyrazole ring, thiazole ring, isothiazole ring, and triazole ring are preferable.
- one or more hydrogen atoms bonded to the carbon atom or nitrogen atom constituting ring Z are a halogen atom, hydroxyl group, carboxy group, sulfo group, cyano group, amino group, N-substituted amino group, nitro group Group, alkoxycarbonyl group, carbamoyl group, N-substituted carbamoyl group, imide group, optionally substituted with a substituent such as an alkyl group having 1 to 12 carbon atoms or an alkoxy group.
- a halogen atom a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, etc.
- the alkyl group constituting the alkyl group or the alkoxy group may be linear, branched or cyclic, and may contain an unsaturated bond.
- the substituent is preferably a long-chain alkyl group having 4 to 12 carbon atoms from the viewpoint of solubility in a transparent resin, and from the viewpoint of increasing visible light transmittance, a halogen atom, a sulfo group, a cyano group, a nitro group, A group having a high electron-withdrawing property such as a trifluoromethyl group and a carbamoyl group is preferred.
- R 1 and R 2 , R 2 and R 3 , and R 1 and the carbon atom or hetero atom (nitrogen atom) constituting ring Z are linked to each other and bonded to the 4-position of the benzene ring.
- Heterocycle A, heterocycle B and heterocycle C may be formed together with the nitrogen atom, respectively.
- all of heterocycle A to heterocycle C may be formed, or one or two may be formed.
- heterocycle A and heterocycle B are heterocycles having 3 to 6 members, and heterocycle C is a heterocycle having 5 or 6 members.
- heterocycle A to heterocycle C is also referred to as “ring A to ring C”.
- Examples of ring A and ring B include an aziridine ring, an azetidine ring, a pyrrolidine ring, a piperidine ring, a piperazine ring, and a morpholine ring.
- Examples of the ring C include a pyrrolidine ring, a piperidine ring, a piperazine ring, and a morpholine ring.
- one or more hydrogen atoms bonded to carbon atoms or nitrogen atoms constituting each ring are halogen atoms, hydroxyl groups, carboxy groups, sulfo groups, cyano groups, amino groups, N-substituted It may be substituted with a substituent such as an amino group, a nitro group, an alkoxycarbonyl group, a carbamoyl group, an N-substituted carbamoyl group, an imide group, an alkyl group having 1 to 12 carbon atoms, or an alkoxy group.
- the alkyl group constituting the alkyl group or alkoxy group may be linear, branched or cyclic.
- R 1 and R 2 when not forming a heterocycle each independently include a hydrogen atom or an unsaturated bond, heteroatom (oxygen atom, etc.), saturated or unsaturated ring structure between carbon atoms.
- a hydrocarbon group which may be substituted, preferably a hydrocarbon group having 1 to 20 carbon atoms.
- Substituents include halogen atom, hydroxyl group, carboxy group, sulfo group, cyano group, amino group, N-substituted amino group, nitro group, alkoxycarbonyl group, carbamoyl group, N-substituted carbamoyl group, imide group, carbon number 1 -12 alkyl groups or alkoxy groups.
- the alkyl group constituting the alkyl group or alkoxy group may be linear, branched or cyclic.
- R 1 and R 2 in the case where a heterocycle is not formed may be branched from the viewpoint of visible light transparency, solubility in a transparent resin, or the like, and may contain a heteroatom between carbon atoms.
- An alkyl group having 1 to 20 carbon atoms is preferable, an alkyl group having 1 to 12 carbon atoms is more preferable, and an alkyl group having 2 to 8 carbon atoms is more preferable.
- R 3 and R 4 are each independently a hydrogen atom, a halogen atom, a hydroxyl group, an alkyl group or an alkoxy group, preferably an alkyl group or alkoxy group having 1 to 20 carbon atoms. Indicates a group.
- the alkyl group constituting the alkyl group or alkoxy group may be linear, branched or cyclic.
- R 3 is preferably a hydrogen atom, a halogen atom or an alkyl group, more preferably a hydrogen atom or an alkyl group.
- R 4 is preferably a hydrogen atom or a halogen atom, particularly preferably a hydrogen atom, from the viewpoint of the steepness of the absorption spectrum, particularly the steepness of the change near the boundary between the visible region and the near-infrared region.
- saturated or unsaturated ring structure means a hydrocarbon ring and a heterocycle having an oxygen atom as a ring constituent atom unless otherwise specified.
- a structure in which an alkyl group having 1 to 10 carbon atoms is bonded to carbon atoms constituting the ring is also included in the category.
- the groups R 1 to R 4 of the benzene ring bonded to the left and right of the squarylium skeleton, and the ring Z that forms a condensed ring adjacent to the benzene ring may be different on the left and right. The same is preferable from the viewpoint.
- the NIR dye (AI) also includes a compound represented by the following formula (AI-1) having a resonance structure of the formula (AI).
- the symbols in formula (AI-1) are the same as defined in formula (AI).
- the NIR dye (AI) has a structure in which specific heterocycles are condensed at the 2nd and 3rd positions of the benzene ring bonded to the left and right sides of the squarylium skeleton.
- the transmittance of light having a wavelength of 430 to 550 nm can be further increased. This is thought to be because the planarity of the molecule can be improved by making the benzene ring a condensed heterocycle.
- the hetero ring is an aromatic hetero ring, the electron of the hetero atom can be delocalized, so that the visible light transmittance can be further increased.
- NIR dye has good solubility in organic solvents and good compatibility with transparent resins. As a result, even if the absorption layer is thin, it has excellent spectral characteristics and the optical filter can be thinned, so that the thermal expansion of the absorption layer due to heating can be suppressed, and functional layers such as a reflection layer and an antireflection layer are formed. During the heat treatment, the occurrence of cracks or the like in those layers can be suppressed.
- NIR dye (AI) include dyes composed of compounds represented by the formulas (A11) to (A15), (A21) to (A26), and (A31). Equation (A11) ⁇ (A15) in the R 1, R 2, R 3, and R 1 when R 4 is not being ring A ⁇ C are formed in the formula (AI), R 2, R 3 and R 4 R 3 and R 4 in the formulas (A21) to (A26) are the same as the definitions of R 3 and R 4 when the ring C is not formed in the formula (AI). R 1 and R 4 in A31) are the same as defined for R 1 and R 4 when ring A is not formed in formula (AI).
- R 5 in the formulas (A11) to (A14), (A21) to (A26), and (A31) each independently represents a hydrogen atom, a halogen atom, a hydroxyl group, a carboxy group, a sulfo group, a cyano group.
- the alkyl group constituting the alkyl group or the alkoxy group may be linear, branched or cyclic, and may contain an unsaturated bond.
- the divalent group Q in the formulas (A21) to (A26) represents a divalent group in which R 1 and R 2 are bonded when the ring A is formed in the formula (AI).
- the divalent group X 1 in (A31) represents a divalent group in which R 2 and R 3 are bonded when ring B is formed in formula (AI).
- R 1 and R 2 are each independently the number of carbon atoms that may contain a hetero atom between carbon atoms from the viewpoints of visible light transparency, solubility in a transparent resin, and the like.
- An alkyl group having 1 to 20 carbon atoms is preferable, and an alkyl group having 2 to 12 carbon atoms which may contain a hetero atom between carbon atoms, for example, the groups (1a) to (5a) are more preferable.
- R 3 is independently a hydrogen atom, a halogen atom, or the like from the viewpoint of solubility in a transparent resin, visible light transmittance, and the like.
- R 4 is preferably a hydrogen atom or a halogen atom, particularly preferably a hydrogen atom, from the viewpoint of the steepness of change near the boundary between the visible region and the near-infrared region.
- R 5 independently represents a hydrogen atom, a halogen atom, a nitro group, a trifluoromethyl group, a cyano group, an alkoxy group.
- a carbonyl group is preferable, and a hydrogen atom, a nitro group, and a trifluoromethyl group are more preferable.
- the hydrogen atom is an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, or an optionally substituted 1 to 10 carbon atom.
- examples include an alkylene group which may be substituted with an acyloxy group, or an alkyleneoxy group.
- the oxygen position is preferably other than N.
- the divalent group Q is particularly preferably an alkylene group having 3 to 5 carbon atoms.
- a preferred embodiment of the divalent group X 1 is the same as the divalent group Q described above.
- R 1 may be independently branched from the viewpoints of solubility in a transparent resin, visible light transmittance, and the like, and may contain a hetero atom between carbon atoms.
- An alkyl group having 1 to 12 carbon atoms is preferable, an alkyl group having 2 to 8 carbon atoms is more preferable, and R 4 is preferably a hydrogen atom or a halogen atom, and particularly preferably a hydrogen atom.
- the specific structures of R 1 and R 2 in Table 1 correspond to formulas (1a) to (5a), respectively.
- the dye (A3-1) is a dye composed of the compound represented by the formula (A3-1).
- two R 1 s, one each on the left and right, are the same on the left and right, and the same applies to R 2 to R 5 .
- NIR dye (AI) can be produced by the method described in, for example, US Patent Publication No. 2014/0061505, International Publication No. 2014/088063. Specifically, the NIR dye (AI) can combine 3,4-dihydroxy-3-cyclobutene-1,2-dione (squaric acid) with squaric acid to form a structure represented by the formula (AI). It can be produced by reacting a compound having a condensed ring. For example, when the NIR dye (AI) has a bilaterally symmetric structure, 2 equivalents of a compound having a condensed ring having a desired structure in the above range may be reacted with 1 equivalent of squaric acid.
- R 1 ⁇ R 5 are the same meaning as R 1 ⁇ R 5 in the formula (A11), Me is methyl, Et is ethyl, Bu is butyl group, Ph refers to a phenyl group, HBraq . Represents hydrobromic acid, and THF represents tetrahydrofuran.
- Me, Et, Bu, Ph, HBraq. , THF when used, has the same meaning as described above.
- the NIR dye (AII) has a squarylium skeleton at the center of the molecular structure, and one benzene ring is bonded to each of the left and right sides of the squarylium skeleton, and the benzene ring is bonded to a nitrogen atom at the 4-position. It consists of a squarylium type compound which has a structure in which the saturated heterocyclic ring containing was formed.
- each R 6 may independently contain a hydrogen atom or an unsaturated bond, a hetero atom (such as an oxygen atom), a saturated or unsaturated ring structure between carbon atoms, and is substituted.
- the hydrocarbon group which may be present is shown.
- Substituents include halogen atom, hydroxyl group, carboxy group, sulfo group, cyano group, amino group, N-substituted amino group, nitro group, alkoxycarbonyl group, carbamoyl group, N-substituted carbamoyl group, imide group, carbon number 1 -12 alkyl groups or alkoxy groups.
- the alkyl group constituting the alkyl group or alkoxy group may be linear, branched or cyclic.
- R 6 is preferably an alkyl group having 1 to 20 carbon atoms which may be branched and may contain a hetero atom between carbon atoms from the viewpoint of visible light transparency, solubility in a transparent resin, and the like.
- An alkyl group having 1 to 12 carbon atoms is more preferable, and an alkyl group having 2 to 8 carbon atoms is more preferable.
- R 7 each independently represents a hydrogen atom, a halogen atom, a hydroxyl group, an alkyl group or an alkoxy group, preferably an alkyl group or alkoxy group having 1 to 20 carbon atoms.
- the alkyl group constituting the alkyl group or alkoxy group may be linear, branched or cyclic.
- R 7 is preferably a hydrogen atom or a halogen atom, particularly preferably a hydrogen atom, from the viewpoint of the steepness of the absorption spectrum, particularly the steepness of the change near the boundary between the visible region and the near-infrared region.
- R 8 is independently a halogen atom, a hydroxyl group, an alkoxy group having 1 to 12 carbon atoms, an acyl group or acyloxy group having 1 to 12 carbon atoms, a perfluoroalkyl group having 1 to 12 carbon atoms, or — SO 2 R 9 group (R 9 represents an optionally substituted alkyl group having 1 to 12 carbon atoms).
- R 8 includes a halogen atom, a hydroxyl group, a —SO 2 R 9 group (provided that R 9 is an alkyl group having 1 to 12 carbon atoms) from the viewpoint of increasing the acidity of the adjacent hydrogen atom at the benzyl position.
- a fluorine atom, a hydroxyl group, and —SO 2 Me are particularly preferable.
- Examples of the divalent group X 2 include an alkylene group in which a hydrogen atom is substituted with an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, or an acyloxy group having 1 to 10 carbon atoms that may be substituted. Group or an alkyleneoxy group. In the case of an alkyleneoxy group, the oxygen position is preferably other than N. X 2 is particularly preferably an alkylene group having 2 to 5 carbon atoms.
- the NIR dye (AII) includes a compound represented by the following formula (AII-1) having a resonance structure represented by the formula (AII).
- the symbols in formula (AII-1) are the same as defined in formula (AII).
- NIR dye does not have a nitrogen atom having an unpaired electron, but has a highly acidic hydrogen atom at the benzyl position adjacent to R 8, and thus has high absorption characteristics for near-infrared light.
- the transmittance of light having a wavelength of 430 to 550 nm in the visible range can be further increased.
- NIR dye is a dye made of the compound represented by the formula (A41). Symbols R 6 to R 8 in formula (A41) are the same as defined in formula (AII), and preferred embodiments are also the same.
- NIR dye examples of preferred dyes as NIR dye (AII) are shown in Table 2.
- two R 6 s one each on the left and right, are the same on the left and right, and the same applies to R 7 and R 8 .
- NIR dye (AI) or NIR dye (AII) when used as the dye (A), the NIR dye (AI) and the NIR dye (AII) are within a range that does not inhibit the effects of the present invention.
- dye (AII) may each be used individually by 1 type, and 2 or more types may be mixed and used for it.
- the content of the pigment (A) in the absorbing layer is preferably 0.1 to 30 parts by mass with respect to 100 parts by mass of the transparent resin (B). Desirable near infrared absorptivity is obtained at 0.1 parts by mass or more, and decrease in near infrared absorptivity and increase in haze value are suppressed at 30 parts by mass or less. Further, the content of the dye (A) is more preferably 0.5 to 25 parts by mass, and further preferably 1 to 20 parts by mass.
- the absorbing layer can contain a dye (U) in addition to the dye (A) and the transparent resin (B).
- the dye (U) include oxazole, merocyanine, cyanine, naphthalimide, oxadiazole, oxazine, oxazolidine, naphthalic acid, styryl, anthracene, cyclic carbonyl, and triazole. And the like. Among these, oxazole-based and merocyanine-based dyes are preferable.
- dye (U) may be used individually by 1 type for an absorption layer, and may use 2 or more types together.
- Transparent resin (B) As transparent resin (B), acrylic resin, epoxy resin, ene thiol resin, polycarbonate resin, polyether resin, polyarylate resin, polysulfone resin, polyethersulfone resin, polyparaphenylene resin, polyarylene ether phosphine oxide resin , Polyimide resins, polyamideimide resins, polyolefin resins, cyclic olefin resins, and polyester resins such as polyethylene terephthalate resins and polyethylene naphthalate resins. These resins may be used alone or in combination of two or more.
- the transparent resin has a glass transition point (from the viewpoint of transparency, solubility of the pigment (A) or the pigment (A) and the pigment (U) in the transparent resin (B), and heat resistance.
- a resin having a high Tg) is preferred.
- at least one selected from polyester resins, polycarbonate resins, polyethersulfone resins, polyarylate resins, polyimide resins, and epoxy resins is preferable, and at least one selected from polyester resins and polyimide resins is more preferable. .
- the absorbing layer is further in the range not impairing the effect of the present invention, adhesion imparting agent, color tone correction dye, leveling agent, antistatic agent, heat stabilizer, light stabilizer, antioxidant, dispersant, flame retardant, You may have arbitrary components, such as a lubricant and a plasticizer.
- the absorption layer dissolves the dye (A), the dye (U), the raw material component of the transparent resin (B) or the transparent resin (B), and each component blended as necessary, in a solvent.
- a coating solution can be prepared by dispersing, coating the substrate, drying, and curing as necessary.
- the base material may be a transparent base material included in the filter, or may be a peelable base material used only when forming the absorption layer.
- the solvent may be a dispersion medium that can be stably dispersed or a solvent that can be dissolved.
- the coating liquid may contain a surfactant to improve voids due to fine bubbles, dents due to adhesion of foreign matters, and repelling in the drying process.
- a dip coating method, a cast coating method, or a spin coating method can be used for coating the coating liquid.
- An absorption layer is formed by applying the coating liquid onto a substrate and then drying it. Further, when the coating liquid contains a raw material component of a transparent resin, a curing treatment such as thermosetting or photocuring is further performed.
- the absorption layer can be manufactured in a film form by extrusion molding, and this film may be laminated on another member and integrated by thermocompression bonding or the like.
- this filter contains a transparent base material, you may stick this film on a transparent base material.
- the reflective layer preferably has a wavelength selectivity that transmits visible light and mainly reflects light having a wavelength other than the light shielding area of the absorption layer.
- the reflection region of the reflection layer may include a light shielding region in the near infrared region of the absorption layer.
- the reflective layer is composed of a dielectric multilayer film in which a low refractive index dielectric film (low refractive index film) and a high refractive index dielectric film (high refractive index film) are alternately stacked.
- the material for the high refractive index film include Ta 2 O 5 , TiO 2 , and Nb 2 O 5 . Of these, TiO 2 is preferable from the viewpoint of film formability, reproducibility in refractive index, and stability.
- Examples of the material for the low refractive index film include SiO 2 and SiO x N y . From the viewpoint of reproducibility, stability, economical efficiency, etc. in film formability, SiO 2 is preferable.
- the thickness of the reflective layer is preferably 2 to 10 ⁇ m.
- the dielectric multilayer film controls the transmission and shielding of light in a specific wavelength region by utilizing the interference of light, and the transmission / shielding characteristics depend on the incident angle. Generally, the wavelength of light shielded by reflection is shorter for light incident obliquely than for light incident perpendicularly (incident angle 0 °).
- the reflective layer may satisfy the following (ii-1) and (ii-2).
- (Ii-1) In each spectral transmittance curve at an incident angle of 0 ° and 30 °, the transmittance of light having a wavelength of 420 to 695 nm is 90% or more.
- (Ii-2) In each of the spectral transmittance curves at incident angles of 0 ° and 30 °, the transmittance of light having a wavelength ⁇ b to 1100 nm is 1% or less (where ⁇ b is the wavelength of the absorption layer 650 to This is the maximum wavelength at which the transmittance of light at 800 nm is 1%).
- the transmittance of light having a wavelength of 420 to 695 nm is preferably 93% or more, more preferably 95% or more, and still more preferably 97% or more.
- the transmittance of light having a wavelength ⁇ b ⁇ 1100 nm is more preferably 0.5% or less. If the reflective layer satisfies (ii-1) and (ii-2), this filter can easily obtain spectral transmittance characteristics that satisfy the requirements of (iii-1) to (iii-6).
- antireflection layer examples include a dielectric multilayer film, an intermediate refractive index medium, and a moth-eye structure in which the refractive index gradually changes.
- a dielectric multilayer film is preferable from the viewpoint of high light utilization efficiency and productivity.
- the thickness of the transparent substrate is preferably 0.03 to 5 mm, more preferably 0.05 to 1 mm from the viewpoint of thinning, and any glass that transmits visible light can be used.
- Various resins such as (birefringent) crystal and polyimide resin can be used.
- absorption glass near infrared absorption glass substrate
- fluorophosphate glass or phosphate glass soda lime glass
- borosilicate glass alkali-free
- glass and quartz glass examples thereof include glass and quartz glass.
- the “phosphate glass” includes silicic acid phosphate glass in which a part of the glass skeleton is composed of SiO 2 .
- the transparent substrate is a fluorophosphate-based glass, specifically, P 5+ 20 to 45%, Al 3+ 1 to 25%, R + 1 to 30% (where R + is Li + , It is at least one of Na + and K + , and the value on the left is the sum of the respective content ratios), Cu 2+ 1 to 20%, R 2+ 1 to 50% (where R 2+ is , Mg 2+ , Ca 2+ , Sr 2+ , Ba 2+ , Zn 2+ , and the value on the left is a total value of the respective content ratios) and in anion% representation, It preferably contains F ⁇ 10 to 65% and O 2 ⁇ 35 to 90%.
- the transparent base material is phosphate glass
- P 2 O 5 30 to 80%, Al 2 O 3 1 to 20%, R 2 O 0.5 to 30% in terms of mass% (however, R 2 O is at least one of Li 2 O, Na 2 O, and K 2 O, and the value on the left is a total value of the respective content ratios))
- CuO 1 to 12% Contains 0.5 to 40% of RO (provided that RO is at least one of MgO, CaO, SrO, BaO, ZnO, and the value on the left is the sum of the respective content ratios) It is preferable to do.
- NF-50E NF-50EX
- NF-50T NF-50TX
- BG-60 BG-61
- SiC silica
- BG-61 above, made by Schott Corp., trade name
- CD5000 manufactured by HOYA, trade name
- the above-described CuO-containing glass may further contain a metal oxide.
- the metal oxide contains, for example, one or more of Fe 2 O 3 , MoO 3 , WO 3 , CeO 2 , Sb 2 O 3 , V 2 O 5, etc.
- the CuO-containing glass has ultraviolet absorption characteristics. Have.
- the content of these metal oxides relative to the CuO-containing glass 100 parts by weight, the Fe 2 O 3, MoO 3, WO 3 and at least one selected from the group consisting of CeO 2, Fe 2 O 3 0.6-5 parts by mass, MoO 3 0.5-5 parts by mass, WO 3 1-6 parts by mass, CeO 2 2.5-6 parts by mass, or two kinds of Fe 2 O 3 and Sb 2 O 3 Fe 2 O 3 0.6 to 5 parts by mass + Sb 2 O 3 0.1 to 5 parts by mass, or V 2 O 5 and CeO 2 in the form of V 2 O 5 0.01 to 0.5 parts by mass + CeO 2
- the amount is preferably 1 to 6 parts by mass.
- this filter contains glass and absorption type glass as the transparent base material 13, durability of an absorption layer between glass or absorption type glass (transparent base material 13), and the absorption layer 11 (11a, 11b).
- a dielectric layer (not shown) having a thickness of 30 nm or more may be provided for the purpose of improving the property.
- the dielectric layer may, for example, contain alkali atoms such as Na atoms and K atoms in a transparent substrate made of glass, and the alkali atoms may diffuse into the absorption layer, thereby deteriorating the optical properties and weather resistance of the absorption layer. In this case, it functions as an alkali barrier film, and the durability of the present filter can be improved.
- the dielectric layer SiO 2 or SiO x, Al 2 O 3 can be preferably used.
- a glass or near infrared absorbing glass provided with a dielectric layer is also referred to as “transparent substrate”. ".
- Examples 1 to 22 are examples of the optical filter according to the present invention.
- NIR dyes (A1-1) to (A1-19), (A2-1) to (A2-6), (A3-1), (A4-1) to (A4-3), and (C1) to ( C3) was synthesized.
- NIR dyes (C1) and (C3) are dyes represented by the following structural formulas, and NIR dye (C2) is a commercially available product described later.
- NIR dye (A1-1) compound (a) and 2,1,3-benzothiadiazole in scheme (F1) were obtained from Tokyo Chemical Industry Co., Ltd. and used as starting materials.
- the filtrate was concentrated and purified by column chromatography using hexane / ethyl acetate (97: 3, volume ratio) as a developing solution to obtain 8.0 g of compound (b).
- the total yield was 19.2 g (89.3 mmol), and the yield was 49%.
- NIR dye (A1-1) (Production of NIR dye (A1-1)) 2.7 g (7.4 mmol) of compound (g), 0.5 g (4.5 mmol) of squaric acid, 30 mL of toluene and 30 mL of 1-butanol were added to a flask equipped with a reflux apparatus and a water diversion apparatus and stirred. The mixture was refluxed at 125 ° C. for 8 hours. After completion of the reaction, the solvent was removed under reduced pressure, and the residue was purified by column chromatography using hexane / ethyl acetate (9: 1, volume ratio) as a developing solution to give NIR dye (A1-1) (2.4 g, 3.0 mmol). Yield 81%).
- NIR Dye (A1-2) In the step of producing compound (g) from compound (d), in place of formic acid, in the presence of sodium bisulfite, N, N-dimethylacetamide (DMAc) is used as a solvent and reacted with pivaloyl aldehyde to give compound ( g) (where, R 5, except that so as to produce tert- butyl group), as in the case of NIR dye (A1-1) was produced NIR dye (A1-2). Specifically, the step of producing compound (g) from compound (d) was performed as follows.
- NIR dye except that in the step of producing compound (g) from compound (d), compound (g) (wherein R 5 is —CF 3 ) is produced using trifluoroacetic acid instead of formic acid.
- NIR dye (A1-3) was produced in the same manner as in (A1-1). Specifically, the step of producing compound (g) from compound (d) was performed as follows. To a flask equipped with a reflux apparatus, 3.0 g (8.0 mmol) of crude compound (d) and 40 mL of trifluoroacetic acid were added and refluxed at 75 ° C. for 18 hours.
- NIR Dye (A1-4) The NIR dye (A1) except that in the step of producing the compound (g) from the compound (d), the compound (g) (wherein R 5 is —CH 3 ) is produced using acetic acid instead of formic acid. NIR dye (A1-4) was produced in the same manner as in -1).
- NIR Dye (A1-5) In the step of producing compound (g) from compound (d), 1-nonanone was used instead of pivaloylaldehyde to produce compound (g) (where R 5 is —C 8 H 17 ). A NIR dye (A1-5) was produced in the same manner as in the case of the NIR dye (A1-2) except for the above.
- NIR Dye (A1-13) In the step of producing compound (c) from compound (b), compound (c) (wherein R 1 and R 2 are groups (2a)) is substituted with diisoamylamine instead of bis (2-ethylhexyl) amine.
- An NIR dye (A1-13) was produced in the same manner as in the case of the NIR dye (A1-1) except that the production was performed.
- NIR Dye (A1-14) In the step of producing compound (c) from compound (b), compound (c) (provided that R 1 and R 2 are groups (3a)) is used by using diisobutylamine instead of bis (2-ethylhexyl) amine. A NIR dye (A1-14) was produced in the same manner as in the case of the NIR dye (A1-1) except that the above procedure was followed.
- NIR Dye (A1-15) In the step of producing compound (c) from compound (b), compound (c) (provided that R 1 and R 2 are groups represented by substituting bis (2-ethylhexyl) amine for bis (2-ethoxyethyl) amine) is used. NIR dye (A1-15) was produced in the same manner as in NIR dye (A1-1) except that (4a)) was produced.
- NIR Dye (A1-16) In the step of producing the compound (c) from the compound (b), the compound (c) (provided that R) is substituted with bis (2- (2-ethylhexyloxy) ethyl) amine instead of bis (2-ethylhexyl) amine. NIR dye (A1-16) was produced in the same manner as for NIR dye (A1-1) except that 1 and R 2 were used to produce group (5a)).
- NIR Dye (A1-17) In the step of producing compound (c) from compound (b), compound (c) (wherein R 1 is a group (1a)) is substituted with N- (2-ethylhexyl) ethylamine instead of bis (2-ethylhexyl) amine. NIR dye (A1-17) was produced in the same manner as for NIR dye (A1-1) except that R 2 was -C 2 H 5 ).
- N- (2-ethylhexyl) ethylamine used for the production of the dye (A1-17) will be described using the following scheme (F2).
- compound (aa) obtained from Tokyo Chemical Industry Co., Ltd. 2-ethylhexylamine was used.
- NIR Dye (A1-18) In the step of producing the compound (c) from the compound (b), N-butylhexylamine is used instead of bis (2-ethylhexyl) amine, and the compound (c) (where R 1 is — (CH 2 ) 5 CH 3 and R 2 produced NIR dye (A1-18) in the same manner as NIR dye (A1-1) except that — (CH 2 ) 3 CH 3 ) was produced.
- N- (2-ethylhexyl) ethylamine used for the production of the dye (A1-18) will be described using the following scheme (F3).
- a compound (ad) and hexylamine obtained from Tokyo Chemical Industry Co., Ltd. were used.
- NIR dye (A1-19) (Production of NIR dye (A1-19)) To a flask equipped with a reflux apparatus and a diversion apparatus, 4.0 g (11.0 mmol) of compound (f1-1), 0.8 g (6.6 mmol) of squaric acid, 40 mL of toluene and 25 mL of 1-butanol were added. The mixture was refluxed at 125 ° C. for 12 hours with stirring. After completion of the reaction, the solvent was removed under reduced pressure, and the residue was purified by column chromatography using toluene / dichloromethane (3: 2, volume ratio) as a developing solution, and NIR dye (A1-19) (4.0 g, 10.0 mmol, Yield 91%) was obtained.
- NIR dye (A2-1) As shown below, the NIR dye (A1-A1) was prepared except that the compound (b) was replaced with the compound (c) to produce the compound (c2) (wherein R 3 and R 4 are both hydrogen atoms). NIR dye (A2-1) was produced in the same manner as in 1).
- NIR dye (A2-1) was used in the same manner as in NIR dye (A2-1) except that N, N-dimethylacetamide (DMAc) was used as a solvent and heptanal was reacted in the presence of sodium bisulfite.
- DMAc N, N-dimethylacetamide
- NIR Dye (A1-6) A production example of the NIR dye (A1-6) will be specifically described using the following scheme (F5).
- R 1 to R 5 in the raw material component and the intermediate product are not described, but R 1 and R 2 are 2-ethylhexyl groups, and R 3 to R 5 are all hydrogen atoms.
- compound (h) and 5-bromoisoquinoline in scheme (F5) were obtained from Tokyo Chemical Industry Co., Ltd. and used as starting materials.
- NIR dye (A1-6) (Production of NIR dye (A1-6)) To the flask, 1.36 g (3.7 mmol) of compound (i), 0.43 g (2.2 mmol) of squaric acid, 12 mL of toluene and 4 mL of butanol were added, and the mixture was heated and stirred at 120 ° C. for 8 hours. After completion of the reaction, the solvent was removed using an evaporator, washed with ethyl acetate, and purified by column chromatography. As a result, NIR dye (A1-6) (0.16 g, 0.2 mmol, yield 11%) was obtained.
- NIR dye (A1-7) was produced in the same manner as in NIR dye (A1-6) except that 7-bromobenzothiophene was used instead of 5-bromoisoquinoline as a starting material. 7-Bromobenzothiophene was produced by the method described in International Publication No. 2013/159862.
- NIR dye (A2-3) was produced in the same manner as in the production of NIR dye (A1-6) except that pyrrolidine was used instead of bis (2-ethylhexyl) amine.
- NIR dye (A2-4) was produced in the same manner as in the production of NIR dye (A1-7) except that pyrrolidine was used in place of bis (2-ethylhexyl) amine.
- NIR dye (A2-5) was produced in the same manner as in the production of NIR dye (A2-3), except that 4-bromobenzoisothiazole was replaced with 5-bromoisoquinoline as a starting material. 4-Bromobenzoisothiazole was produced by the method described in WO 2011/100502.
- NIR dye (A2-6) was produced in the same manner as in the production of NIR dye (A2-3), except that 5-bromoisoquinoline as a starting material was replaced with compound (m) shown below.
- the manufacture example of a compound (m) is demonstrated using the following scheme (F6).
- compound (j) was obtained from Tokyo Chemical Industry Co., Ltd. and used as a starting material.
- NIR Dye (A1-8) A production example of the NIR dye (A1-8) will be specifically described using the following scheme (F7). In the following description, R 1 and R 2 in the raw material component and the (intermediate) product are not described, but both are groups (2a). In the production of NIR dye (A1-8), compound (t) and 2,6-difluorobenzaldehyde in scheme (F7) were obtained from Tokyo Chemical Industry Co., Ltd. and used as starting materials.
- NIR dye (A1-8) (Production of NIR dye (A1-8)) To a flask equipped with a reflux apparatus and a water diversion apparatus, 1.2 g (4.5 mmol) of the compound (v), 0.25 g (2.3 mmol) of squaric acid, 25 mL of toluene and 25 mL of 1-butanol were added and the mixture was stirred with 110 mL. Reflux at 12 ° C. for 12 hours. After completion of the reaction, the solvent was removed under reduced pressure, and the resulting solid was washed with methylene chloride and methanol. As a result, NIR dye (A1-8) (1.0 g, 1.6 mmol, yield 72%) was obtained.
- NIR Dye (A1-9) In the step of producing compound (u) from compound (t), compound (u) (wherein R 1 and R 2 are groups (1a)) is substituted with di (2-ethylhexyl) amine instead of diisoamylamine.
- the NIR dye (A1-9) was produced in the same manner as the NIR dye (A1-8) except that the NIR dye purification method was changed to silica gel column chromatography.
- compound (u) was produced from compound (t) as follows. To the flask were added 12.7 g (52.8 mmol) of di (2-ethylhexyl) amine, 10 mL of N, N-dimethylformamide (DMF), and 7.3 g (52.8 mmol) of potassium carbonate, and the mixture was stirred at room temperature. 2,6-Difluorobenzaldehyde (5 g, 35.1 mmol) was added. The reaction temperature was set to 80 ° C. using an oil bath, and the mixture was stirred for 3 days. The reaction temperature was returned to room temperature, 30 mL of water was added and stirred, and 50 mL each of ethyl acetate and hexane were added.
- DMF N, N-dimethylformamide
- NIR Dye (A1-10) In the step of producing compound (u) from compound (t), diisobutylamine is used instead of diisoamylamine to produce compound (u) (wherein R 1 and R 2 are groups (3a)), and NIR dye NIR dye (A1-10) was produced in the same manner as in NIR dye (A1-8) except that the purification method was changed to silica gel column chromatography.
- compound (u) was produced from compound (t) as follows. To the flask, 6.8 g (52.8 mmol) of diisobutylamine, 10 mL of N, N-dimethylformamide (DMF) and 7.3 g (52.8 mmol) of potassium carbonate were added and stirred at room temperature, and further 2,6-difluoro Benzaldehyde 5 g (35.1 mmol) was added. The reaction temperature was set to 80 ° C. using an oil bath, and the mixture was stirred for 3 days. The reaction temperature was returned to room temperature, 30 mL of water was added and stirred, and 50 mL each of ethyl acetate and hexane were added.
- DMF N, N-dimethylformamide
- 7.3 g 52.8 mmol
- 2,6-difluoro Benzaldehyde 5 g 35.1 mmol
- NIR Dye (A1-11) In the step of producing compound (u) from compound (t), compound (u) is substituted with bis (2-ethoxyethyl) amine in place of diisoamylamine (provided that R 1 and R 2 are groups (4a)).
- NIR dye (A1-11) was produced in the same manner as NIR dye (A1-8) except that the purification method of NIR dye was changed to silica gel column chromatography.
- compound (u) was produced from compound (t) as follows. To the flask, 8.5 g (52.8 mmol) of bis (2-ethoxyethyl) amine, 10 mL of N, N-dimethylformamide (DMF) and 7.3 g (52.8 mmol) of potassium carbonate were added and stirred at room temperature. 2,6-difluorobenzaldehyde 5 g (35.1 mmol) was added. The reaction temperature was raised to 80 ° C. using an oil bath and the mixture was stirred for 15 hours. The reaction temperature was returned to room temperature, 30 mL of water was added and stirred, and 50 mL each of ethyl acetate and hexane were added.
- DMF N, N-dimethylformamide
- NIR Dye (A1-12) In the step of producing compound (u) from compound (t), compound (u) (provided that R 1 , R 2 is substituted with bis (2- (2-ethylhexyloxy) ethyl) amine instead of diisoamylamine). And the NIR dye (A1-12) was produced in the same manner as in the case of the NIR dye (A1-8) except that the purification method of the NIR dye was changed to silica gel column chromatography. did.
- compound (u) was produced from compound (t) as follows. To the flask were added 6.6 g (19.9 mmol) of bis (2- (2-ethylhexyloxy) ethyl) amine, 55 mL of N, N-dimethylformamide (DMF), and 3.9 g (28.4 mmol) of potassium carbonate. The mixture was stirred at room temperature, and 2.7 g (18.9 mmol) of 2,6-difluorobenzaldehyde was further added. The reaction temperature was set to 80 ° C. using an oil bath, and the mixture was stirred for 2 days.
- DMF N, N-dimethylformamide
- reaction temperature was returned to room temperature, 30 mL of water was added and stirred, and 50 mL each of ethyl acetate and hexane were added.
- the organic layer was dried over anhydrous magnesium sulfate, the solvent was removed under reduced pressure, and the residue was purified by column chromatography using hexane / ethyl acetate (9: 1, volume ratio) as a developing solution to obtain compound (u) (7. 7 g, 17.1 mmol, yield 90%).
- Ts represents a paratoluenesulfonyl group
- Bn represents a benzyl group
- reaction solution was added dropwise to 100 mL of ice water while adding ice blocks in a timely manner, and then a 40% aqueous sodium hydroxide solution was added dropwise.
- 500 mL of ethyl acetate was added.
- the organic layer was dried over anhydrous sodium sulfate, the solvent was removed under reduced pressure, and the residue was purified by column chromatography using hexane / ethyl acetate (9: 1, volume ratio) as a developing solution to obtain compound (p) (14.7 g, 45 mmol) was obtained.
- the yield based on the compound (n) was 92%.
- NIR dye (A3-1) (Production of NIR dye (A3-1)) Add 1.4 g (5.4 mmol) of compound (r), 0.4 g (3.2 mmol) of squaric acid, 25 mL of toluene and 25 mL of 1-butanol to a flask equipped with a reflux apparatus and a diversion apparatus and stir. The mixture was refluxed at 125 ° C. for 12 hours. After completion of the reaction, the solvent was removed under reduced pressure, and the residue was purified by column chromatography using toluene / dichloromethane (3: 2, volume ratio) as a developing solution, and NIR dye (A3-1) (1.0 g, 1.7 mmol, Yield 63%) was obtained.
- NIR Dye (A4-1) [Production of NIR Dye (A4-1)]
- NIR dye (A4-1) will be specifically described using Scheme (F10).
- Scheme (F10) Py represents a pyridyl group.
- compound (x1) and indole-6-carboxaldehyde in scheme (F10) were obtained from Tokyo Chemical Industry Co., Ltd. and used as starting materials.
- the NIR dyes (C1) and (C3) used for comparison were produced by the methods described in International Publication No. 2014/088063 and JP 2014-059550 A, respectively, and the NIR dye (C2 ) Used S2098 (trade name, manufactured by FEW Chemicals).
- Table 3 shows the average transmittance (T Avg. (430 to 430) of light having a wavelength of 430 to 460 nm when the maximum absorption wavelength of each dye is ⁇ max and the transmittance at the maximum absorption wavelength ⁇ max is 1% . 460) ), the slope ( ⁇ T / ⁇ ) of the spectral transmittance curve between the wavelength ⁇ 80 at which the transmittance is 80% on the shorter wavelength side than the maximum absorption wavelength ⁇ max and the wavelength ⁇ 10 at which the transmittance is 10%.
- the maximum value of the ( ⁇ T / ⁇ (max)) the light transmittance of a wavelength of 410 ⁇ 460nm (T (410-460) ) the minimum value of (T min (410-460)), with respect to the wavelength 460nm or less of the light longest wavelength lambda 97 which transmittance is 97%, the wavelength lambda 80 which transmittance is 80% in a short wavelength side of the maximum absorption wavelength lambda max, the difference between the maximum absorption wavelength lambda max of the ( ⁇ max - ⁇ 80) Each is shown.
- dyes (A1-1) to (A1-5), (A1-7) to (A1-19), (A2-1) to (A2-4), (A3-1), ( All of A4-1) to (A4-3) satisfy the requirements (i-1) to (i-3).
- the dyes (C1) to (C3) do not satisfy any of the requirements (i-1) to (i-3).
- the dyes (A1-1) to (A1-5), (A1-8) to (A1-19), (A2-1), and (A2-2) are further represented by the requirements (i-4) to ( It also satisfies i-7).
- Example 1 From a dielectric multilayer film 52 layers, a TiO 2 film and a SiO 2 film are alternately laminated on a 0.3 mm-thick glass (non-alkali glass; manufactured by Asahi Glass Co., Ltd., product name: AN100) by vapor deposition. A reflective layer was formed. The reflection layer was simulated using the number of laminated dielectric multilayer films, the thickness of the TiO 2 film, and the SiO 2 film as parameters. In each of the spectral transmittance curves at incident angles of 0 ° and 30 °, the requirements (ii-1) and It was required to satisfy (ii-2). FIG. 3 shows a spectral transmittance curve of the produced reflective layer.
- cyclohexanone, N-methylpyrodrin, and a dye (A1-1) are added to a polyimide resin solution (Neoprim (registered trademark) C3450 manufactured by Mitsubishi Gas Chemical Co., Ltd.), and a coating solution for forming an absorption layer is prepared.
- a polyimide resin solution Neoprim (registered trademark) C3450 manufactured by Mitsubishi Gas Chemical Co., Ltd.
- a coating solution for forming an absorption layer is prepared.
- This coating liquid is applied to the surface opposite to the reflective layer forming surface of the glass substrate on which the reflective layer is formed by spin coating, and then the solvent is heated and dried to a thickness of about 1.0 ⁇ m.
- An absorbent layer was formed.
- an antireflection layer was formed by alternately laminating TiO 2 films and SiO 2 films on the surface of the absorption layer by vapor deposition as in the case of the reflection layer, thereby obtaining an NIR filter.
- Example 2 to 22 An NIR filter was obtained in the same manner as in Example 1 except that the NIR dye added to the coating solution for forming the absorption layer was changed as shown in Tables 4 and 5.
- spectral transmittance curves (incidence angles 0 ° and 30 °) were measured using an ultraviolet-visible spectrophotometer (U-4100, manufactured by Hitachi High-Technologies Corporation). It was measured. 4A to 4U (Examples 1 to 21 respectively) show the obtained spectral transmittance curves (incidence angles of 0 ° and 30 °).
- the NIR filter of each example has an average transmittance of light with a wavelength of 430 to 550 nm, a minimum transmittance of light with a wavelength of 430 to 550 nm, and a light with a wavelength of 430 to 480 nm with respect to an incident angle of 0 °.
- Average transmittance, average transmittance of light having a wavelength of 350 to 395 nm, average transmittance of light having a wavelength of 710 to 1100 nm, and average shift amount of transmittance of light having a wavelength of 600 to 700 nm were calculated. These results are shown in Tables 4 and 5.
- the NIR filters (Examples 1 to 21) of the manufactured examples all satisfy the requirements (iii-1) to (iii-6), and in particular, the wavelengths of 430 to 550 nm. It has been found that the optical filter has a high optical transmittance. Although the NIR filter of the comparative example (Example 22) satisfies the requirements (iii-1) to (iii-6), the measurement result of the dye in dichloromethane shows the requirements (i-1) to ( Not satisfy all i-3).
- the near-infrared absorbing dye of the present invention has an excellent near-infrared shielding property and is excellent in the transmittance of visible light, particularly light having a wavelength of 430 to 550 nm, so that an optical filter that requires high-precision color reproducibility is required. And useful for imaging devices.
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Abstract
Description
かかる光学フィルタにおいては、とくに、近赤外域で高い吸収性を有し、可視域で高い透過性を有する色素を用いることで、近赤外光に対する急峻な遮断性が得られ、可視光による画像の良好な色再現性が得られる。
例えば、既知のスクアリリウム系色素は、近赤外光の遮断性に優れ、可視光の透過率も高いレベルにあり、可視域から近赤外域に向かって透過率が急峻に変化する特性を有する。本出願人は、スクアリリウム系色素を含む光学フィルタが、一定レベル以上の可視光透過率を実現できることを見出した(特許文献1)。しかし、可視光透過率をさらに高くすることで、より高精度の色再現性実現の要求が高まってきている。とくに、可視域の中でも相対的に短波長側にある波長430~550nmの光の透過率をより高めることで、青色系の色再現性の精度を高める要求も強くなってきている。
(i-1)波長400~800nmの吸収スペクトルにおいて、670nm以上の波長領域に最大吸収波長λmaxを有する。
(i-2)波長430~550nmの光に対する最大吸光係数εAと、波長670nm以上の光に対する最大吸光係数εBとの間に、次の関係式が成り立つ。
εB/εA≧65
(i-3)分光透過率曲線において、前記最大吸収波長λmaxにおける透過率を1%としたとき、波長430~460nmの光の平均透過率が94.0%以上である。
環Zは、それぞれ独立して、ヘテロ原子を環中に0~3個有し、かつ置換されていてもよい、5員または6員環であり、
R1とR2、R2とR3、およびR1と環Zを構成する炭素原子またはヘテロ原子は、互いに連結して窒素原子とともにそれぞれヘテロ環A、ヘテロ環Bおよびヘテロ環Cを形成していてもよく、ヘテロ環を形成していない場合、R1およびR2は、それぞれ独立して、水素原子、または炭素原子間に不飽和結合、ヘテロ原子、飽和もしくは不飽和の環構造を含んでよく、かつ置換されていてもよい炭化水素基を示し、R3は、それぞれ独立して、水素原子、ハロゲン原子、水酸基または炭素原子間にヘテロ原子を含んでもよいアルキル基もしくはアルコキシ基を示し、
R4は、それぞれ独立して、水素原子、ハロゲン原子、水酸基または炭素原子間にヘテロ原子を含んでもよいアルキル基もしくはアルコキシ基を示す。
R6は、それぞれ独立して、水素原子、または炭素原子間に不飽和結合、ヘテロ原子、飽和もしくは不飽和の環構造を含んでよく、かつ置換されていてもよい炭化水素基を示し、
R7は、それぞれ独立して、水素原子、ハロゲン原子、水酸基または炭素原子間にヘテロ原子を含んでもよいアルキル基もしくはアルコキシ基を示し、
R8は、それぞれ独立して、ハロゲン原子、水酸基、炭素数1~12のアルコキシ基、炭素数1~12のアシル基もしくはアシルオキシ基、炭素数1~12のパーフルオロアルキル基、または-SO2R9基(R9は、置換されていてもよい炭素数1~12のアルキル基を示す)を示し、
X2は、炭素原子間に不飽和結合、ヘテロ原子、飽和もしくは不飽和の環構造を含んでよく、かつ置換されていてもよい2価の炭化水素基を示す。
また、本発明に係る撮像装置は、固体撮像素子と、撮像レンズと、上記光学フィルタを備えたことを特徴とする。
本発明の一実施形態のNIRフィルタ(以下、「本フィルタ」ともいう)は、1層または2層以上の吸収層を有する。吸収層が2層以上で構成される場合、各層は同じでも異なってもよい。吸収層が2層以上の構成の場合、一方の層が、NIR色素を含む樹脂からなる近赤外線吸収層、もう一方の層が、UV色素を含む樹脂からなる紫外線吸収層とする例が挙げられる。また、吸収層は、それそのものが基板(樹脂基板)であってもよい。
図1(e)は、透明基材13の一方の主面上に吸収層11a、他方の主面上に吸収層11bを備え、さらに吸収層11aの主面上に選択波長遮蔽層12a、吸収層11bの主面上に選択波長遮蔽層12bを備えた例である。
(iii-1)波長430~550nmの光の平均透過率が90%以上であり、かつ波長430~550nmの光の最小透過率が75%以上である。
(iii-2)波長430~480nmの光の平均透過率が87%以上である。
(iii-3)波長600~700nmの光の平均透過率が25%以上である。
(iii-4)波長350~395nmの光の平均透過率が2%以下である。
(iii-5)波長710~1100nmの光の平均透過率が2%以下である。
(iii-6)入射角0°の分光透過率曲線における波長600~700nmの光の透過率と、入射角30°の分光透過率曲線における波長600nm~700nmの光の透過率との差分の絶対値の平均値(以下、「波長600~700nmの光の透過率平均シフト量」という)が7%/nm以下である。
(iii-2)を満たすことで、青色系の撮像の色再現性の精度をさらに高めることができる。
(iii-3)を満たすことで、固体撮像素子の分光感度に不要な波長700nm以上の光をカットしつつ、人間の視感度に関与する波長600~700nmの光を効率よく透過できる。
(iii-4)を満たすことで、固体撮像素子の分光感度を人間の視感度に近づけることができる。
(iii-5)を満たすことで、固体撮像素子の分光感度を人間の視感度に近づけることができる。
(iii-6)を満たすことで、波長600~700nmの光の入射角依存性を低くでき、この波長域における固体撮像素子の分光感度の入射角依存性を小さくできる。
吸収層は、近赤外線吸収色素(A)と、透明樹脂(B)とを含有し、典型的には、透明樹脂(B)中に近赤外線吸収色素(A)が均一に溶解または分散した層または(樹脂)基板である。吸収層は、さらに紫外線吸収色素(U)を含有してもよい。また、吸収層は、前述のとおり、複数設けてもよい。近赤外線吸収色素(A)は、以下「色素(A)」、紫外線吸収色素(U)は以下「色素(U)」ともいう。
色素(A)は、ジクロロメタンに溶解して測定される吸収特性が、(i-1)~(i-3)を満たすとよい。
(i-1)波長400~800nmの光の吸収スペクトルにおいて、波長670nm以上の波長域に最大吸収波長λmaxを有する。
(i-2)波長430~550nmの光に対する最大吸光係数εAと、波長670nm以上の光に対する最大吸光係数εBとの間に、次の関係式が成り立つ。
εB/εA≧65
(i-3)分光透過率曲線において、最大吸収波長λmaxにおける透過率を1%としたとき、波長430~460nmの光に対する平均透過率(TAvg.(430-460))が94.0%以上である。
(i-4)分光透過率曲線において、最大吸収波長λmaxにおける透過率を1%としたときの最大吸収波長λmaxより短波長側で透過率が80%、10%となる波長をそれぞれ波長λ80、波長λ10としたとき、前記波長λ80と前記波長λ10との間の前記分光透過率曲線の傾き(ΔT/Δλ)の最大値が、-0.5[%/nm]以下である。
(i-5)分光透過率曲線において、最大吸収波長λmaxにおける透過率を1%としたとき、波長410~460nmの光の透過率(T(410-460))が93.0%以上である。
(i-6)分光透過率曲線において、最大吸収波長λmaxにおける透過率を1%としたとき、波長460nm以下の光に対して透過率が97%となる最長波長(λ97)が457nm以下である。
(i-7)分光透過率曲線において、最大吸収波長λmaxにおける透過率を1%としたときの最大吸収波長λmaxより短波長側で透過率が80%となる波長λ80と、最大吸収波長λmaxとの差(λmax-λ80)が78nm以下である。
また、(i-2)において、εB/εA≧70がより好ましい。また、(i-2)において、波長430~550nmの光に対する最大吸光係数εAと、波長680~770nmの光に対する最大吸光係数をεBとし、該εBとの間に、εB/εA≧65が成り立つとより好ましく、εB/εA≧70がより好ましい。
また、(i-3)において、TAvg.(430-460)は、95.0%以上が好ましく、96.0%以上がより好ましく、96.5%以上がさらに好ましい。
また、(i-4)において、(ΔT/Δλ)の最大値は、-0.52[%/nm]以下が好ましく、-0.55[%/nm]以下がより好ましい。なお、傾き(ΔT/Δλ)は、例えば、1nm間隔(即ち、Δλ=1nm)で得られる値等で与えることができる。
また、(i-5)において、T(410-460)は、93.5%以上が好ましく、94.0%以上がより好ましい。
また、(i-6)において、λ97は、455nm以下が好ましく、452nm以下がより好ましく、445nm以下がさらに好ましい。
さらに、(i-7)において、λmax-λ80は、75nm以下が好ましく、73nm以下がより好ましい。
具体的に、(i-1)を満たすことで、所定の近赤外光を十分に遮蔽できる。また、(i-2)および(i-3)を満たすことで、とくに青色系の可視光透過率を高くできる。また、(i-4)を満たすことで、可視域のうちの長波長側領域と近赤外域との間で急峻な透過率変化が得られ、赤色系の可視光透過率を高くできるとともに良好な近赤外線遮蔽特性を実現できる。また、(i-5)を満たすことで、とくに青色系の可視光透過率を高くできる。また、(i-6)を満たすことで、さらに青色系の可視光透過率を高くできる。さらに、(i-7)を満たすことで、可視域のうちの長波長側領域と近赤外域との間で急峻な透過率変化が得られ、良好な近赤外線遮蔽特性を実現できる。
NIR色素(AI)は、分子構造の中央にスクアリリウム骨格を有し、スクアリリウム骨格の左右に各1個のベンゼン環が結合し、そのベンゼン環は4位で窒素原子と結合するとともに、ベンゼン環の2位と3位の炭素原子を含むヘテロ環が形成された縮合環構造を左右に有するスクアリリウム系化合物からなる。
環A、BおよびCは、各々の環を構成する炭素原子または窒素原子に結合する1つ以上の水素原子が、ハロゲン原子、水酸基、カルボキシ基、スルホ基、シアノ基、アミノ基、N-置換アミノ基、ニトロ基、アルコキシカルボニル基、カルバモイル基、N-置換カルバモイル基、イミド基、炭素数1~12のアルキル基またはアルコキシ基等の置換基で置換されていてもよい。アルキル基、アルコキシ基を構成するアルキル基は、直鎖状、分岐鎖状、環状のいずれであってもよい。
さらに、式(A11)~(A14)、(A21)~(A26)、(A31)において、R5は、独立して、水素原子、ハロゲン原子、ニトロ基、トリフルオロメチル基、シアノ基、アルコキシカルボニル基が好ましく、水素原子、ニトロ基、トリフルオロメチル基がより好ましい。
また、式(A31)において、R1は、透明樹脂への溶解性、可視光透過性等の観点から、独立して、分岐していてもよく、炭素原子間にヘテロ原子を含んでもよい炭素数1~12のアルキル基が好ましく、炭素数2~8のアルキル基がより好ましく、R4は、水素原子、ハロゲン原子が好ましく、水素原子がとくに好ましい。
NIR色素(AII)は、分子構造の中央にスクアリリウム骨格を有し、スクアリリウム骨格の左右に各1個のベンゼン環が結合し、そのベンゼン環は4位で窒素原子と結合するとともに、該窒素原子を含む飽和複素環が形成された構造を有するスクアリリウム系化合物からなる。
また、NIR色素(AII)は、式(AII)の共鳴構造の下記式(AII-1)で示される化合物も含むものとする。式(AII-1)中の記号は式(AII)における定義と同じである。
吸収層は、色素(A)と、透明樹脂(B)に加え、色素(U)を含有できる。色素(U)は、具体例に、オキサゾール系、メロシアニン系、シアニン系、ナフタルイミド系、オキサジアゾール系、オキサジン系、オキサゾリジン系、ナフタル酸系、スチリル系、アントラセン系、環状カルボニル系、トリアゾール系等の色素が挙げられる。この中でも、オキサゾール系、メロシアニン系の色素が好ましい。また、色素(U)は、吸収層に1種を単独で用いてもよく、2種以上を併用してもよい。
透明樹脂(B)として、アクリル樹脂、エポキシ樹脂、エン・チオール樹脂、ポリカーボネート樹脂、ポリエーテル樹脂、ポリアリレート樹脂、ポリサルホン樹脂、ポリエーテルサルホン樹脂、ポリパラフェニレン樹脂、ポリアリーレンエーテルフォスフィンオキシド樹脂、ポリイミド樹脂、ポリアミドイミド樹脂、ポリオレフィン樹脂、環状オレフィン樹脂、およびポリエチレンテレフタレート樹脂、ポリエチレンナフタレート樹脂等のポリエステル樹脂等が挙げられる。これらの樹脂は1種を単独で使用してもよく、2種以上を混合して使用してもよい。
吸収層は、さらに、本発明の効果を損なわない範囲で、密着性付与剤、色調補正色素、レベリング剤、帯電防止剤、熱安定剤、光安定剤、酸化防止剤、分散剤、難燃剤、滑剤、可塑剤等の任意成分を有してもよい。
反射層としては、可視光を透過し、吸収層の遮光域以外の波長の光を主に反射する波長選択性を有するとよい。この場合、反射層の反射領域は、吸収層の近赤外域における遮光領域を含んでもよい。
(ii-1)入射角0°および30°の各分光透過率曲線において、波長420~695nmの光の透過率が90%以上である。
(ii-2)入射角0°および30°の各分光透過率曲線において、波長λb~1100nmの光の透過率が1%以下である(ここで、λbは、吸収層の波長650~800nmの光の透過率が1%となる最大波長である)。
(ii-2)において、波長λb~1100nmの光の透過率は、0.5%以下がより好ましい。
反射層が、(ii-1)および(ii-2)を満たせば、本フィルタは、(iii-1)~(iii-6)の要件を満たす分光透過率特性を容易に得られる。
反射防止層としては、誘電体多層膜や中間屈折率媒体、屈折率が漸次的に変化するモスアイ構造等が挙げられる。中でも高い光利用効率、生産性の観点から誘電体多層膜の使用が好ましい。
透明基材を用いる場合、該透明基材の厚さは、0.03~5mmが好ましく、薄型化の点から、0.05~1mmがより好ましく、可視光を透過するものであれば、ガラスや(複屈折性)結晶、ポリイミド樹脂等種々の樹脂が利用できる。
NIR色素(A1-1)~(A1-19)、(A2-1)~(A2-6)、(A3-1)、(A4-1)~(A4-3)、および(C1)~(C3)を合成した。なお、NIR色素(C1)および(C3)は、下記の構造式で表される色素であり、NIR色素(C2)は後述する市販品である。
以下、スキーム(F1)を用いて色素(A1-1)の製造例を具体的に記載する。なお、以下の説明において、原料成分および(中間)生成物におけるR1~R5については記載しないが、R1およびR2は2-エチルヘキシル基、R3~R5はいずれも水素原子である。
還流装置を装備したフラスコに、化合物(a)を25.0g(183.7mmol)、48%臭化水素酸を150mL加えた。100℃に昇温後、臭素を8.5mL(165.4mmol)滴下し、100℃で9時間撹拌し、放冷した。反応終了後、ジクロロメタン200mLを加え析出した固体を溶解し、さらに亜硫酸ナトリウム水溶液100mLを加えた。有機層を回収し、飽和炭酸水素ナトリウム水溶液で洗浄し、無水硫酸ナトリウムで乾燥した後、溶媒を減圧除去して未精製の化合物(b)を得た。これを200mLのヘキサン/酢酸エチル(4:1、容量比)に懸濁させ、溶け残った固体を濾過することで複製生物である4,7-ジブロモ-2,1,3-ベンゾチアジアゾールを除去した。濾液を再び濃縮し、200mLのヘキサンに懸濁させ、溶け残った固体を濾過することで化合物(b)を11.2g得た。さらに濾液を濃縮し、ヘキサン/酢酸エチル(97:3、容量比)を展開液としたカラムクロマトグラフィー法にて精製し、化合物(b)を8.0g得た。合計19.2g(89.3mmol)で、収率は49%であった。
還流装置を装備したフラスコに、t-ブトキシカリウムを3.3g(29.0mmol)、Pd触媒としてPEPPSITM-IPr(Sigma-Aldrich社製 商品名)を0.3g(0.5mmol)、トルエンを150mL、化合物(b)を5.2g(24.1mmol)、ビス(2-エチルヘキシル)アミンを8.0mL(26.5mmol)加え、窒素雰囲気下、120℃で5時間還流した。反応終了後、濾過にて反応液中の固体を除去し、濾液を濃縮した後、ヘキサン/酢酸エチル(99:1、容量比)を展開液としたカラムクロマトグラフィーで精製し、化合物(c)(5.3g、14mmol、収率58%)を得た。
還流装置を装備したフラスコに、化合物(c)を3.6g(9.5mmol)、THFを100mL、水素化アルミニウムリチウムを0.9g(23.8mmol)加え、窒素雰囲気下、75℃で1時間還流した。その後、氷冷しながら水0.9mL、15%水酸化ナトリウム水溶液0.9mL、水2.7mLを順次加えて反応を停止させた。濾過にて反応液中の固体を除去し、濾液を濃縮して未精製の化合物(d)を得た。化合物(d)は未精製のまま次の反応に使用した。
還流装置を装備したフラスコに、上記で得られた化合物(d)と90%ギ酸を50mL加え、100℃で2時間還流した。反応終了後、ギ酸を減圧除去し、これに酢酸エチル50mL、飽和炭酸水素ナトリウム水溶液50mLを加えた。有機層を回収し、無水硫酸ナトリウムで乾燥した後、溶媒を減圧除去した。これをヘキサン/酢酸エチル(2:1、容量比)を展開液としたカラムクロマトグラフィーで精製し、化合物(g)(2.7g、7.4mmol)を得た。化合物(c)からの収率は78%であった。
還流装置および分水装置を装備したフラスコに、化合物(g)を2.7g(7.4mmol)、スクアリン酸を0.5g(4.5mmol)、トルエンを30mLおよび1-ブタノールを30mL加え、撹拌しながら125℃で8時間還流した。反応終了後、溶媒を減圧除去した後、ヘキサン/酢酸エチル(9:1、容量比)を展開液としたカラムクロマトグラフィーで精製し、NIR色素(A1-1)(2.4g、3.0mmol、収率81%)を得た。
化合物(d)から化合物(g)を製造する工程において、ギ酸に代えて、亜硫酸水素ナトリウム存在下、N,N-ジメチルアセトアミド(DMAc)を溶媒として、ピバロイルアルデヒドと反応させて、化合物(g)(但し、R5はtert-ブチル基)を製造するようにした以外は、NIR色素(A1-1)の場合と同様にして、NIR色素(A1-2)を製造した。
具体的には、化合物(d)から化合物(g)を製造する工程を次のように行った。
還流装置を装備したフラスコに、未精製の化合物(d)を2.8g(7.5mmol)、DMAcを20mL、亜硫酸水素ナトリウムを0.8g(7.5mmol)加えた。100℃に昇温後、ピバロイルアルデヒドを0.8mL(7.5mmol)とDMAcを20mL混合した溶液を15分間かけて滴下し、さらに100℃で2時間還流した。反応終了後、溶媒を減圧除去し、これに酢酸エチル50mL、飽和炭酸水素ナトリウム水溶液50mLを加えた。有機層を回収し、無水硫酸ナトリウムで乾燥し、溶媒を減圧除去した後、ヘキサン/酢酸エチル(9:1、容量比)を展開液としたカラムクロマトグラフィーで精製し、2.3g(5.6mmol)の化合物(g)を得た。化合物(c)からの収率は74%であった。
化合物(d)から化合物(g)を製造する工程において、ギ酸に代えてトリフルオロ酢酸を用いて化合物(g)(但し、R5は-CF3)を製造するようにした以外は、NIR色素(A1-1)の場合と同様にして、NIR色素(A1-3)を製造した。
具体的には、化合物(d)から化合物(g)を製造する工程を次のように行った。
還流装置を装備したフラスコに、未精製の化合物(d)3.0g(8.0mmol)とトリフルオロ酢酸を40mL加え、75℃で18時間還流した。反応終了後、トリフルオロ酢酸を減圧除去し、これに酢酸エチル50mL、飽和炭酸水素ナトリウム水溶液50mLを加えた。有機層を回収し、無水硫酸ナトリウムで乾燥し、溶媒を減圧除去した後、ヘキサン/酢酸エチル(95:5、容量比)を展開液としたカラムクロマトグラフィーで精製し、化合物(g)(2.5g、5.9mmol)を得た。化合物(c)からの収率は73%であった。
化合物(d)から化合物(g)を製造する工程において、ギ酸に代えて酢酸を用いて化合物(g)(但し、R5は-CH3)を製造するようにした以外は、NIR色素(A1-1)の場合と同様にして、NIR色素(A1-4)を製造した。
化合物(d)から化合物(g)を製造する工程において、ピバロイルアルデヒドに代えて1-ノナノンを用いて化合物(g)(但し、R5は-C8H17)を製造するようにした以外は、NIR色素(A1-2)の場合と同様にして、NIR色素(A1-5)を製造した。
化合物(b)から化合物(c)を製造する工程において、ビス(2-エチルヘキシル)アミンに代えてジイソアミルアミンを用いて化合物(c)(但し、R1およびR2は基(2a))を製造するようにした以外は、NIR色素(A1-1)の場合と同様にして、NIR色素(A1-13)を製造した。
化合物(b)から化合物(c)を製造する工程において、ビス(2-エチルヘキシル)アミンに代えてジイソブチルアミンを用いて化合物(c)(但し、R1およびR2は基(3a))を製造するようにした以外は、NIR色素(A1-1)の場合と同様にして、NIR色素(A1-14)を製造した。
化合物(b)から化合物(c)を製造する工程において、ビス(2-エチルヘキシル)アミンに代えてビス(2-エトキシエチル)アミンを用いて化合物(c)(但し、R1およびR2は基(4a))を製造するようにした以外は、NIR色素(A1-1)の場合と同様にして、NIR色素(A1-15)を製造した。
化合物(b)から化合物(c)を製造する工程において、ビス(2-エチルヘキシル)アミンに代えてビス(2-(2-エチルヘキシロキシ)エチル)アミンを用いて化合物(c)(但し、R1およびR2は基(5a))を製造するようにした以外は、NIR色素(A1-1)の場合と同様にして、NIR色素(A1-16)を製造した。
化合物(b)から化合物(c)を製造する工程において、ビス(2-エチルヘキシル)アミンに代えてN-(2-エチルヘキシル)エチルアミンを用いて化合物(c)(但し、R1は基(1a)、R2は-C2H5)を製造するようにした以外は、NIR色素(A1-1)の場合と同様にして、NIR色素(A1-17)を製造した。
フラスコに、化合物(aa)8.59mL(52.5mmol)、トリエチルアミン7.67mL(55.0mmol)、ジクロロメタン150mLを加え、窒素雰囲気下、0℃でアセチルクロリドを3.54mL(50.0mmol)滴下し、そのまま0℃で1時間撹拌した。反応終了後、ジクロロメタンを減圧除去し、酢酸エチル150mL、1M塩酸150mLを加えて有機層を回収した。有機層を無水硫酸ナトリウムで乾燥し、溶媒を減圧除去して未精製の化合物(ab)を得、これをそのまま次の反応に使用した。
還流装置を装備したフラスコに、上記で得られた化合物(ab)、THF200mL、水素化アルミニウムリチウム2.28g(60.0mmol)を加え、窒素雰囲気下、75℃で1時間還流した。その後、氷冷しながら飽和硫酸ナトリウム水溶液を3.5mL加えて反応を停止させた。ろ過にて反応液中の固体を除去し、ろ液を濃縮して未精製の化合物(ac)を得た。これを減圧蒸留にて精製し、化合物(ac)(7.24g、46.1mmol、収率は92%)を得た。
化合物(b)から化合物(c)を製造する工程において、ビス(2-エチルヘキシル)アミンに代えてN-ブチルヘキシルアミンを用いて化合物(c)(但し、R1は-(CH2)5CH3、R2は-(CH2)3CH3)を製造するようにした以外は、NIR色素(A1-1)の場合と同様にして、NIR色素(A1-18)を製造した。
モレキュラーシーブを詰めた滴下漏斗および還流装置を装備したフラスコに、化合物(ad)6.57mL、ブタノール4.51mL、トルエン50mLを加え、135℃で3時間還流した。反応終了後、トルエンを減圧除去し、未精製の化合物(ae)を得、これをそのまま次の反応に使用した。
フラスコに、上記で得られた化合物(ae)、メタノール50mLを加え、0℃で水素化ホウ素ナトリウム1.89g(50.0mmol)を加え、室温で1時間撹拌した。その後、1M塩酸30mLを加えて反応を停止させた。メタノールを減圧除去し、酢酸エチル50mLを加え有機層を回収した。有機層を無水硫酸ナトリウムで乾燥し、溶媒を減圧除去した後、酢酸エチル/メタノール(20:1、容量比)を展開液としたカラムクロマトグラフィーで精製した。その結果、化合物(af)(1.76g、11.2mmol、収率22%)を得た。
以下、スキーム(F4)を用いてNIR色素(A1-19)の製造例を具体的に記載する。なお、スキーム(F4)中、R1およびR2は2-エチルヘキシル基、R3およびR4は水素原子である。また、Acはアセチル基を示す。
還流装置を装備したフラスコに、化合物(c)を6.1g(16.2mmol)、THFを130mL、水素化アルミニウムリチウムを1.5g(40.6mmol)加え、窒素雰囲気下、75℃で1時間還流した。その後、氷冷しながら水1.5mL、15%水酸化ナトリウム水溶液1.5mL、水4.6mLを順次加えて反応を停止させた。濾過にて反応液中の固体を除去し、濾液を濃縮して未精製の化合物(d)を得た。化合物(d)は未精製のまま次の反応に使用した。
フラスコに、上記で得られた化合物(d)と酢酸を40mL、蒸留水を40mL加え、氷冷下、0.5Mの亜硝酸ナトリウム水溶液を15分かけて滴下した。氷冷下で1時間反応させた後、ヘキサン100mLを加え、室温に戻し、有機層を回収した。水層にヘキサン70mLを加えて抽出し、回収した有機層と合わせ、飽和炭酸水素ナトリウム水溶液で洗浄し、無水硫酸ナトリウムで乾燥した後、溶媒を減圧除去した。これをヘキサン/酢酸エチル(4:1、容量比)を展開液としたカラムクロマトグラフィーで精製し、化合物(f1-1)(4.0g、11.0mmol)を得た。化合物(c)からの収率は68%であった。
還流装置および分水装置を装備したフラスコに、化合物(f1-1)を4.0g(11.0mmol)、スクアリン酸を0.8g(6.6mmol)、トルエンを40mLおよび1-ブタノールを25mL加え、撹拌しながら125℃で12時間還流した。反応終了後、溶媒を減圧除去した後、トルエン/ジクロロメタン(3:2、容量比)を展開液としたカラムクロマトグラフィーで精製し、NIR色素(A1-19)(4.0g、10.0mmol、収率91%)を得た。
下記に示すように、化合物(b)から化合物(c)に代えて化合物(c2)(但し、R3およびR4はいずれも水素原子)を製造するようにした以外は、NIR色素(A1-1)の場合と同様にして、NIR色素(A2-1)を製造した。
還流装置を装備したフラスコに、t-ブトキシカリウムを2.7g(24.2mmol)、Pd触媒(PEPPSITM-IPr)を0.3g(0.4mmol)、トルエンを70mL、化合物(b)を4.3g(20.2mmol)、ピロリジンを1.8mL(22.2mmol)加え、窒素雰囲気下、120℃で3時間還流した。反応終了後、濾過にて反応液中の固体を除去し、濾液を濃縮した後、ジクロロメタンを展開液としたカラムクロマトグラフィーで精製し、化合物(c2)(2.9g、14mmol、収率70%)を得た。
ギ酸に代えて、亜硫酸水素ナトリウム存在下、N,N-ジメチルアセトアミド(DMAc)を溶媒として、ヘプタナールとを反応させるようにした以外は、NIR色素(A2-1)の場合と同様にして、NIR色素(A2-2)を製造した。
下記スキーム(F5)を用いてNIR色素(A1-6)の製造例を具体的に説明する。なお、以下の説明において、原料成分および中間生成物におけるR1~R5については記載しないが、R1およびR2は2-エチルヘキシル基、R3~R5はいずれも水素原子である。
NIR色素(A1-6)の製造においては、スキーム(F5)中の化合物(h)、5-ブロモイソキノリンを東京化成工業(株)より入手し出発物質として用いた。
フラスコに5-ブロモイソキノリンを2.08g(10mmol)、トルエン10ml、ビス(2-エチルヘキシル)アミンを2.65g(11mmol)、Pd触媒(PEPPSITM-IPr)を0.13g(0.2mmol)、t-ブトキシカリウムを1.34g(12mmol)加え、120℃で5時間反応させた。反応終了後、濾過にて反応液中の固体を除去し、濾液を濃縮した後、カラムクロマトグラフィー法にて精製した。その結果、化合物(i)(1.36g、3.7mmol、収率37%)を得た。
フラスコに化合物(i)1.36g(3.7mmol)、スクアリン酸0.43g(2.2mmol)、トルエン12mL、ブタノール4mLを加え、120℃で8時間加熱撹拌した。反応終了後、エバポレーターを用いて溶媒を除去した後、酢酸エチルで洗浄し、カラムクロマトグラフィー法にて精製した。その結果、NIR色素(A1-6)(0.16g、0.2mmol、収率11%)を得た。
出発物質として5-ブロモイソキノリンに代えて7-ブロモベンゾチオフェンを用いた以外は、NIR色素(A1-6)の場合と同様にして、NIR色素(A1-7)を製造した。なお、7-ブロモベンゾチオフェンは、国際公開第2013/159862号明細書に記載された方法により製造した。
NIR色素(A1-6)の製造において、ビス(2-エチルヘキシル)アミンに代えてピロリジンを用いた以外は同様にして、NIR色素(A2-3)を製造した。
NIR色素(A1-7)の製造において、ビス(2-エチルヘキシル)アミンに代えてピロリジンを用いた以外は同様にして、NIR色素(A2-4)を製造した。
NIR色素(A2-3)の製造において、出発物質の5-ブロモイソキノリンを4-ブロモベンゾイソチアゾールに代えた以外は同様にして、NIR色素(A2-5)を製造した。なお、4-ブロモベンゾイソチアゾールは、国際公開第2011/100502号明細書に記載された方法により製造した。
NIR色素(A2-3)の製造において、出発物質の5-ブロモイソキノリンを下記に示す化合物(m)に代えた以外は同様にして、NIR色素(A2-6)を製造した。
以下、下記スキーム(F6)を用いて、化合物(m)の製造例を説明する。
化合物(m)の製造においては、化合物(j)を東京化成工業(株)より入手し出発物質として用いた。
フラスコに化合物(j)1.07g(4.0mmol)、ジクロロメタン15mL、塩化アセチル0.47g(6.0mmol)を加え、室温で5時間撹拌した。反応終了後、エバポレーターを用いて溶媒を除去した後、カラムクロマトグラフィー法にて精製した。その結果、化合物(k)(1.2g、3.9mmol、収率98%)を得た。
フラスコに化合物(k)1.2g、(3.9mmol)、キシレン15mL、ローソン試薬(LR)1.6g(3.9mmol)を加え、110℃で12時間撹拌した。反応終了後、濾過した濾液をエバポレーターを用いて溶媒を除去した後、カラムクロマトグラフィー法にて精製した。その結果、化合物(l)(0.84g、2.6mmol、収率66%)を得た。
フラスコに化合物(l)0.4g、(1.3mmol)、ジメトキシエタン(DME)15mL、炭酸セシウム0.7g(1.95mmol)、ヨウ化銅0.014g(0.06mmol)、1,10-フェナントロリン(Phen)0.028g、(0.12mmol)を加え、70℃で24時間撹拌した。反応終了後、濾過にて反応液中の固体を除去し、濾液を濃縮した後、カラムクロマトグラフィー法にて精製した。その結果、化合物(m)(0.1g、0.4mmol、収率31%)を得た。
下記スキーム(F7)を用いてNIR色素(A1-8)の製造例を具体的に説明する。なお、以下の説明において、原料成分および(中間)生成物におけるR1、R2については記載しないが、いずれも基(2a)である。
NIR色素(A1-8)の製造においては、スキーム(F7)中の化合物(t)、2,6-ジフルオロベンズアルデヒドを東京化成工業(株)より入手し出発物質として用いた。
フラスコに、ジイソアミルアミン8.3g(52.8mmol)、N,N-ジメチルホルムアミド(DMF)10mL、炭酸カリウム7.3g(52.8mmol)を加えて室温で撹拌し、さらに、2,6-ジフルオロベンズアルデヒド5g(35.1mmol)を加えた。オイルバスを使い反応温度を80℃にし3日間撹拌した。反応温度を室温に戻し、水30mLを加えて撹拌し、酢酸エチルとヘキサンをそれぞれ50mLずつ加えた。有機層を無水硫酸マグネシウムで乾燥し、溶媒を減圧除去した後、ヘキサン/酢酸エチル(100:5、容量比)を展開液としたカラムクロマトグラフィーで精製した。その結果、化合物(u)(9.8g、35.2mmol、収率100%)を得た。
フラスコに、化合物(u)9.8g(35.2mmol)、エチレングリコール25mL、ヒドラジン一水和物3.9g(77.8mmol)を加え、165℃で18時間撹拌した。反応温度を室温に戻し、水30mL、塩化メチレン30mLを加え撹拌した。有機層を無水硫酸マグネシウムで乾燥し、溶媒を減圧除去した後、ヘキサン/酢酸エチル(9:1、容量比)を展開液としたカラムクロマトグラフィーで精製した。その結果、化合物(v)(1.2g、4.5mmol、収率13%)を得た。
還流装置および分水装置を装備したフラスコに、化合物(v)1.2g(4.5mmol)、スクアリン酸0.25g(2.3mmol)、トルエン25mLおよび1-ブタノール25mLを加え、撹拌しながら110℃で12時間還流した。反応終了後、溶媒を減圧除去し、得られた固体を塩化メチレン、メタノールで洗浄した。その結果、NIR色素(A1-8)(1.0g、1.6mmol、収率72%)を得た。
化合物(t)から化合物(u)を製造する工程において、ジイソアミルアミンに代えてジ(2-エチルヘキシル)アミンを用いて化合物(u)(但し、R1、R2は基(1a))を製造するとともに、NIR色素の精製方法をシリカゲルカラムクロマトグラフィーに変更した以外は、NIR色素(A1-8)の場合と同様にして、NIR色素(A1-9)を製造した。
フラスコに、ジ(2-エチルヘキシル)アミン12.7g(52.8mmol)、N,N-ジメチルホルムアミド(DMF)10mL、炭酸カリウム7.3g(52.8mmol)を加えて室温で撹拌し、さらに、2,6-ジフルオロベンズアルデヒド5g(35.1mmol)を加えた。オイルバスを使い反応温度を80℃にし3日間撹拌した。反応温度を室温に戻し、水30mLを加えて撹拌し、酢酸エチルとヘキサンをそれぞれ50mLずつ加えた。有機層を無水硫酸マグネシウムで乾燥し、溶媒を減圧除去した後、ヘキサン/酢酸エチル(9:1、容量比)を展開液としたカラムクロマトグラフィーで精製し、化合物(u)(8.8g、24.2mmol、収率69%)を得た。
化合物(t)から化合物(u)を製造する工程において、ジイソアミルアミンに代えてジイソブチルアミンを用い化合物(u)(但し、R1、R2は基(3a))を製造するとともに、NIR色素の精製方法をシリカゲルカラムクロマトグラフィーに変更した以外は、NIR色素(A1-8)の場合と同様にして、NIR色素(A1-10)を製造した。
フラスコに、ジイソブチルアミン6.8g(52.8mmol)、N,N-ジメチルホルムアミド(DMF)10mL、炭酸カリウム7.3g(52.8mmol)を加えて室温で撹拌し、さらに、2,6-ジフルオロベンズアルデヒド5g(35.1mmol)を加えた。オイルバスを使い反応温度を80℃にし3日間撹拌した。反応温度を室温に戻し、水を30mL加えて撹拌し、酢酸エチルとヘキサンをそれぞれ50mLずつ加えた。有機層を無水硫酸マグネシウムで乾燥し、後溶媒を減圧除去した後、ヘキサン/酢酸エチル(9:1、容量比)を展開液としたカラムクロマトグラフィーで精製し、化合物(u)(8.8g、33.9mmol、収率96%)を得た。
化合物(t)から化合物(u)を製造する工程において、ジイソアミルアミンに代えてビス(2-エトキシエチル)アミンを用いて化合物(u)(但し、R1、R2は基(4a))を製造するとともに、NIR色素の精製方法をシリカゲルカラムクロマトグラフィーに変更した以外は、NIR色素(A1-8)の場合と同様にして、NIR色素(A1-11)を製造した。
フラスコに、ビス(2-エトキシエチル)アミン8.5g(52.8mmol)、N,N-ジメチルホルムアミド(DMF)10mL、炭酸カリウム7.3g(52.8mmol)を加えて室温で撹拌し、さらに、2,6-ジフルオロベンズアルデヒド5g(35.1mmol)を加えた。オイルバスを使い反応温度を80℃にし15時間撹拌した。反応温度を室温に戻し、水30mLを加えて撹拌し、酢酸エチルとヘキサンをそれぞれ50mLずつ加えた。有機層を無水硫酸マグネシウムで乾燥し、溶媒を減圧除去した後、ヘキサン/酢酸エチル(8:2、容量比)を展開液としたカラムクロマトグラフィーで精製し、化合物(u)(8.4g、29.9mmol、収率84%)を得た。
化合物(t)から化合物(u)を製造する工程において、ジイソアミルアミンに代えてビス(2-(2-エチルヘキシロキシ)エチル)アミンを用いて化合物(u)(但し、R1、R2は基(5a))を製造するとともに、NIR色素の精製方法をシリカゲルカラムクロマトグラフィーに変更した以外は、NIR色素(A1-8)の場合と同様にして、NIR色素(A1-12)を製造した。
フラスコに、ビス(2-(2-エチルヘキシロキシ)エチル)アミン6.6g(19.9mmol)、N,N-ジメチルホルムアミド(DMF)55mL、炭酸カリウム3.9g(28.4mmol)を加えて室温で撹拌し、さらに、2,6-ジフルオロベンズアルデヒド2.7g(18.9mmol)を加えた。オイルバスを使い反応温度を80℃にし2日間撹拌した。反応温度を室温に戻し、水30mLを加えて撹拌し、酢酸エチルとヘキサンをそれぞれ50mLずつ加えた。有機層を無水硫酸マグネシウムで乾燥し、溶媒を減圧除去した後、ヘキサン/酢酸エチル(9:1、容量比)を展開液としたカラムクロマトグラフィー法にて精製し、化合物(u)(7.7g、17.1mmol、収率90%)を得た。
フラスコに、化合物(w)10.0g(57.4mmol)、塩化メチレン150mLを加えて氷浴中で撹拌した。トリエチルアミン8.7g(86.1mmol)、パラトルエンスルホン酸クロリド11.5g(60.2mmol)を加えた後、室温に戻し、2時間撹拌し、水150mLを加えて撹拌した。有機層を無水硫酸マグネシウムで乾燥し、溶媒を減圧除去した後、ヘキサン/酢酸エチル(9:1、容量比)を展開液としたカラムクロマトグラフィーで精製し、化合物(x)(17.1g、52.1mmol、収率91%)を得た。
フラスコに、ベンジルアミン2.68g(25.0mmol)、アセトニトリル20mL、炭酸カリウム20.5g(14.9mmol)を加えて氷浴中で撹拌した。その後、アセトニトリル30mLに溶解した化合物(x)17.1g(52.1mmol)を加えた。氷浴をオイルバスに変更し、90℃で2日間還流撹拌した。その後炭酸カリウムをろ過し、ろ液を減圧留去し、ヘキサン/酢酸エチル(100:3、容量比)を展開液としたカラムクロマトグラフィーで精製した。その結果、化合物(y)(8.7g、20.7mmol、収率82%)を得た。
フラスコに、化合物(y)8.7g(20.7mmol)、テトラヒドロフラン(THF)40mLを加え、氷浴中で撹拌した。10%パラジウムカーボン2.7gを加えた後、メタノール120mLを加え、ギ酸アンモニウム18.3g(290mmol)を加え室温で12時間撹拌した。減圧濾過によりパラジウムカーボンと不溶性のギ酸アンモニウムを取り除き、ろ液を減圧濃縮後、塩化メチレンと水で分液をした。得られた有機層を硫酸マグネシウムで乾燥し、溶媒を留去した後、塩化メチレン/メタノール(100:3、容量比)を展開液としたカラムクロマトグラフィーで精製した。その結果、化合物(z)、ビス(2-(2-エチルヘキシロキシ)エチル)アミン、(6.6g、19.9mmol、収率96%)を得た。
以下、スキーム(F9)を用いてNIR色素(A3-1)の製造例を具体的に記載する。
色素(A3-1)の製造においては、スキーム(F9)中の化合物(n)を、国際公開第2014/088063号明細書に記載の方法により製造し出発物質として用いた。
フラスコに、化合物(n)を10.0g(49.2mmol)、N,N-ジメチルホルムアミド(DMF)を200mL加えた。0℃に冷却後、50mLのDMFに溶解させたN-ブロモコハク酸イミド(NBS)を8.8g(49.2mmol)滴下し、0℃で1時間撹拌した。水を100mL加え反応を停止させた後、DMFを減圧除去し、酢酸エチルを100mL加えた。有機層を無水硫酸ナトリウムで乾燥した後、溶媒を減圧除去して化合物(o)を得た。化合物(o)は未精製のまま次の反応に使用した。
フラスコに化合物(o)を13.6g(48.3mmol)加え、0℃で濃硫酸48.7g(496.5mmol)をすばやく滴下し、30分攪拌した。その後、60%濃硝酸を6.1g(58.0mmol)と濃硫酸17.8g(181.1mmol)からなる混酸を、氷浴下で滴下し、室温に戻して2時間撹拌した。反応終了後、100mLの氷水中に適時氷塊を加えながら反応液を滴下し、その後、40%水酸化ナトリウム水溶液を滴下した。溶液が塩基性になったことをpH試験紙で確認した後、酢酸エチルを500mL加えた。有機層を無水硫酸ナトリウムで乾燥し、溶媒を減圧除去した後、ヘキサン/酢酸エチル(9:1、容量比)を展開液としたカラムクロマトグラフィーで精製し、化合物(p)(14.7g、45mmol)を得た。化合物(n)からの収率は92%であった。
フラスコに化合物(p)を5.5g(16.7mmol)、THFを80mL加えた。窒素雰囲気下、-40℃にて1-プロペニルマグネシウムブロミド(0.5M、THF溶液)100mL(50mmol)を滴下し、1時間撹拌した。塩化アンモニウム水溶液を150mL加え反応を停止させた後、室温に戻し酢酸エチルを150mL加えた。有機層を飽和食塩水で洗浄、無水硫酸ナトリウムで乾燥し、溶媒を減圧除去して化合物(q)を得た。化合物(q)は未精製のまま次の反応に使用した。
フラスコに化合物(q)とTHFを40mL加えた。その後、0℃にてパラジウム炭素(Pd/C)を1.1g、メタノールを120mL、ギ酸アンモニウムを5.3g(83.4mmol)加え、室温に戻して1時間撹拌した。反応終了後、水を100mL加え、濾過して固体を除去し、濾液中のメタノールとTHFを減圧除去した。ここに酢酸エチル100mLを加え、有機層を回収し、無水硫酸ナトリウムで乾燥した後、溶媒を減圧除去して粗化合物(r)を得た。これをヘキサン/酢酸エチル(9:1、容量比)を展開液としたカラムクロマトグラフィーで精製し、化合物(r)(1.4g、5.4mmol)を得た。化合物(p)からの収率は32%であった。
還流装置および分水装置を装備したフラスコに、化合物(r)を1.4g(5.4mmol)、スクアリン酸を0.4g(3.2mmol)、トルエンを25mLおよび1-ブタノールを25mL加え、撹拌しながら125℃で12時間還流した。反応終了後、溶媒を減圧除去した後、トルエン/ジクロロメタン(3:2、容量比)を展開液としたカラムクロマトグラフィーで精製し、NIR色素(A3-1)(1.0g、1.7mmol、収率63%)を得た。
以下、スキーム(F10)を用いてNIR色素(A4-1)の製造例を具体的に記載する。スキーム(F10)中、Pyはピリジル基を示す。
NIR色素(A4-2)の製造においては、スキーム(F10)中の化合物(x1)、インドール-6-カルボキシアルデヒドを東京化成工業(株)より入手し出発物質として用いた。
窒素雰囲気下、フラスコに、化合物(x1)を1.0g(6.89mmol)、エタノールを20mL、ピリジンボランを3.84g(41.33mmol)加え、氷冷下、6M塩酸水溶液11mLを滴下し、0℃で3時間、室温で18時間攪拌した。その後、氷冷下、飽和炭酸水素ナトリウム水溶液50mLを加え、酢酸エチル100mLで抽出を行った。得られた有機層を無水硫酸ナトリウムにより乾燥し、エバポレーターを用いて溶媒を除去した後、ヘキサン/酢酸エチル(3:2、容量比)を展開液としたカラムクロマトグラフィーにて精製し、化合物(x2)(0.35g、2.24mmol)を得た。化合物(x1)からの収率は34%であった。
フラスコに、化合物(x2)を0.35g(2.24mmol)、テトラブチルアンモニウムヨージドを85mg(0.23mmol)、33重量%水酸化カリウム水溶液を10mL、テトラヒドロフランを10mL加え、2-ヨードプロパン1.99gを滴下し、80℃で15時間攪拌した。その後、100mLの水を加え、エバポレーターを用いてテトラヒドロフランを大部分除去した後、酢酸エチル100mLで抽出を行った。得られた有機層を無水硫酸ナトリウムにより乾燥し、エバポレーターを用いて溶媒を除去した後、ヘキサン/酢酸エチル(1:1、容量比)を展開液としたカラムクロマトグラフィーにて精製し、化合物(x3)(0.39g、1.95mmol)を得た。化合物(x2)からの収率は87%であった。
分水装置を装備したフラスコに、化合物(x3)を0.45g(2.51mmol)、トルエンを10mL、1-ブタノールを10mL、スクアリン酸を0.14g(1.25mmol)加え、アゼオトロープ加熱還流条件下で3時間攪拌した。反応終了後、エバポレーターを用いて反応溶媒を除去した後、ヘキサン/酢酸エチル(1:2、容量比)を展開液としたカラムクロマトグラフィーにて精製し、化合物(A4-1)(0.12g、0.39mmol)を得た。化合物(x3)からの収率は20%であった。
以下、スキーム(F11)を用いてNIR色素(A4-2)の製造例を具体的に記載する。
NIR色素(A4-2)の製造においては、NIR色素(A4-1)の場合と同様にしてインドール-7-カルボキシアルデヒド(スキーム(F10)中の化合物(x1))から製造した化合物(x3)を出発物質として用いた。
窒素雰囲気下、フラスコに、DeoxoFluor(登録商標)(Sigma-Aldrich社製)を3.69g(16.68mmol)およびジクロロメタン15mLを加え、ジクロロメタン15mL中に溶解させた化合物(x3)2.90g(15.16mmol)を滴下し、同温度で1時間攪拌した。その後、氷冷下、飽和炭酸水素ナトリウム水溶液30mLを加え、ジクロロメタン100mLで抽出を行った。得られた有機層を無水硫酸ナトリウムにより乾燥し、エバポレーターを用いて溶媒を除去した後、ヘキサン/酢酸エチル(2:1、容量比)を展開液としたカラムクロマトグラフィーにて精製し、化合物(x4)(0.21g、1.06mmol)を得た。化合物(x3)からの収率は7%であった。
分水装置を装備したフラスコに、化合物(x4)を0.20g(1.03mmol)、トルエンを10mL、1-ブタノールを10mL、スクアリン酸を0.06g(0.52mmol)加え、アゼオトロープ加熱還流条件下で3時間攪拌した。反応終了後、エバポレーターを用いて反応溶媒を除去した後、ヘキサン/酢酸エチル(1:2、容量比)を展開液としたカラムクロマトグラフィーにて精製し、化合物(A4-2)(0.05g、0.10mmol)を得た。化合物(x4)からの収率は10%であった。
以下、スキーム(F12)を用いてNIR色素(A4-3)の製造例を具体的に記載する。
NIR色素(A4-3)の製造においては、NIR色素(A4-1)の場合と同様にしてインドール-7-カルボキシアルデヒド(スキーム(F10)中の化合物(x1))から製造した化合物(x3)を出発物質として用いた。
窒素雰囲気中、氷冷下、フラスコに、化合物(x3)を2.10g(10.98mmol)、ジクロロメタンを30mL、トリエチルアミン(TEA)を1.22g(12.08mmol)、メタンスルホニルクロリド(MsCl)を2.30g(12.08mmol)を加え、同温度で5時間攪拌した後、室温で15時間撹拌した。その後、氷冷下、ジクロロメタン100mLで抽出を行った。得られた有機層を無水硫酸ナトリウムにより乾燥し、エバポレーターを用いて溶媒を除去した後、ヘキサン/酢酸エチル(2:1、容量比)を展開液としたカラムクロマトグラフィーにて精製し、化合物(x5)(1.04g、4.94mmol)を得た。化合物(x3)からの収率は45%であった。
フラスコに、化合物(x5)を0.56g(2.67mmol)、ジメチルホルムアミド(DMF)を8mL、メタンスルホン酸ナトリウムを0.82g(8.01mmol)を加え、60℃で2時間攪拌した。その後、水30mLを加え、酢酸エチル100mLで抽出を行った。得られた有機層を無水硫酸ナトリウムにより乾燥し、エバポレーターを用いて溶媒を除去した後、ヘキサン/酢酸エチル(1:1、容量比)を展開液としたカラムクロマトグラフィーにて精製し、化合物(x6)(0.48g、1.90mmol)を得た。化合物(x5)からの収率は71%であった。
分水装置を装備したフラスコに、化合物(x6)を0.48g(1.90mmol)、トルエンを10mL、1-ブタノールを10mL、スクアリン酸を0.11g(0.95mmol)加え、アゼオトロープ加熱還流条件下で3時間攪拌した。反応終了後、エバポレーターを用いて反応溶媒を除去した後、残渣をジクロロメタンおよびヘキサンで洗浄し、化合物(A4-3)(0.09g、0.32mmol)を得た。化合物(x6)からの収率は17%であった。
(1)ジクロロメタン中における色素の吸収特性
上記で得られたNIR色素をジクロロメタン中に溶解し、紫外可視分光光度計((株)島津製作所製、UV-3100)を用いて分光透過率曲線を測定し、波長430~550nmにおける最大吸光係数εA、波長680~770nmにおける最大吸光係数εB(=1で規格化)、およびそれらの比(εB/εA)を算出した。なお、吸光係数εBは、波長670nm以上における最大吸光係数といずれも一致した。表3にその結果を示す。また、表3には、各色素の最大吸収波長をλmax、最大吸収波長λmaxにおける透過率を1%としたときの、波長430~460nmの光の平均透過率(TAvg.(430~460))、最大吸収波長λmaxより短波長側で透過率が80%となる波長λ80と透過率が10%となる波長λ10との間の分光透過率曲線の傾き(ΔT/Δλ)の最大値(ΔT/Δλ(max))、波長410~460nmの光の透過率(T(410-460))の最小値(Tmin(410-460))、波長460nm以下の光に対して透過率が97%となる最長波長λ97、最大吸収波長λmaxより短波長側で透過率が80%となる波長λ80と、最大吸収波長λmaxとの差(λmax-λ80)をそれぞれ示す。なお、傾き(ΔT/Δλ)は、Δλ=1nmの間隔に基づき得られた値であり、傾き(ΔT/Δλ)の最大値は、得られた複数の傾きの最大値を示す。さらに、色素(A1-1)~(A1-5)、(A1-7)~(A1-19)、(A4-1)~(A4-3)について、最大吸収波長λmaxにおける透過率を1%としたときの分光透過率曲線を図2A~図2Dに示す。
(例1)
厚さ0.3mmのガラス(無アルカリガラス;旭硝子(株)製、商品名:AN100)基板に蒸着法により、TiO2膜とSiO2膜を交互に積層して、誘電体多層膜52層からなる反射層を形成した。反射層は、誘電体多層膜の積層数、TiO2膜、SiO2膜の膜厚をパラメータとしてシミュレーションし、入射角0°および30°の各分光透過率曲線において、要件(ii-1)および(ii-2)を満たすように求めた。図3に、作製した反射層の分光透過率曲線を示す。
吸収層を形成するための塗工液に添加するNIR色素を表4および表5に示すように変えた以外は例1と同様にして、NIRフィルタを得た。
作製したNIRフィルタ(例1~例22)について、紫外可視分光光度計((株)日立ハイテクノロジーズ社製、U-4100形)を用いて分光透過率曲線(入射角0°および30°)を測定した。図4A~図4U(それぞれ、例1~例21)に、得られた分光透過率曲線(入射角0°および30°)を示す。
Claims (29)
- ジクロロメタンに溶解して測定される吸収特性が(i-1)~(i-3)の要件を満たすことを特徴とする近赤外線吸収色素。
(i-1)波長400~800nmの吸収スペクトルにおいて、670nm以上の波長領域に最大吸収波長λmaxを有する。
(i-2)波長430~550nmの光に対する最大吸光係数εAと、波長670nm以上の光に対する最大吸光係数εBとの間に、次の関係式が成り立つ。
εB/εA≧65
(i-3)分光透過率曲線において、前記最大吸収波長λmaxにおける透過率を1%としたとき、波長430~460nmの光の平均透過率が94.0%以上である。 - ジクロロメタンに溶解して測定される吸収特性が(i-4)の要件を満たす請求項1に記載の近赤外線吸収色素。
(i-4)分光透過率曲線において、前記最大吸収波長λmaxにおける透過率を1%としたときの前記最大吸収波長λmaxより短波長側で透過率が80%、10%となる波長をそれぞれ波長λ80、波長λ10としたとき、前記波長λ80と前記波長λ10との間の前記分光透過率曲線の傾きの最大値が、-0.5[%/nm]以下である。 - ジクロロメタンに溶解して測定される吸収特性が(i-5)の要件を満たす請求項1または2に記載の近赤外線吸収色素。
(i-5)分光透過率曲線において、前記最大吸収波長λmaxにおける透過率を1%としたとき、波長410~460nmの光の透過率が93.0%以上である。 - ジクロロメタンに溶解して測定される吸収特性が(i-6)の要件を満たす請求項1~3のいずれか1項に記載の近赤外線吸収色素。
(i-6)分光透過率曲線において、前記最大吸収波長λmaxにおける透過率を1%としたとき、波長460nm以下の光に対して透過率が97%となる最長波長が457nm以下である。 - ジクロロメタンに溶解して測定される吸収特性が(i-7)の要件を満たす請求項1~4のいずれか1項に記載の近赤外線吸収色素。
(i-7)分光透過率曲線において、前記最大吸収波長λmaxにおける透過率を1%としたときの前記最大吸収波長λmaxより短波長側で透過率が80%となる波長λ80と、前記最大吸収波長λmaxとの差が78nm以下である。 - (i-3)において、波長430~460nmの光の平均透過率が95.0%以上である請求項1~5のいずれか1項に記載の近赤外線吸収色素。
- スクアリリウム系化合物からなる請求項1~6のいずれか1項に記載の近赤外線吸収色素。
- 前記スクアリリウム系化合物が、式(AI)で示されるスクアリリウム系化合物である請求項7に記載の近赤外線吸収色素。
環Zは、それぞれ独立して、ヘテロ原子を環中に0~3個有し、かつ置換されていてもよい、5員または6員環であり、
R1とR2、R2とR3、およびR1と環Zを構成する炭素原子またはヘテロ原子は、互いに連結して窒素原子とともにそれぞれヘテロ環A、ヘテロ環Bおよびヘテロ環Cを形成していてもよく、ヘテロ環を形成していない場合、R1およびR2は、それぞれ独立して、水素原子、または炭素原子間に不飽和結合、ヘテロ原子、飽和もしくは不飽和の環構造を含んでよく、かつ置換されていてもよい炭化水素基を示し、R3は、それぞれ独立して、水素原子、ハロゲン原子、水酸基、または炭素原子間にヘテロ原子を含んでもよいアルキル基もしくはアルコキシ基を示し、
R4は、それぞれ独立して、水素原子、ハロゲン原子、水酸基または炭素原子間にヘテロ原子を含んでもよいアルキル基もしくはアルコキシ基を示す。 - 前記環Zは、少なくとも1つの窒素原子または硫黄原子をヘテロ原子として含む請求項8に記載の近赤外線吸収色素。
- 前記環Zは、芳香族ヘテロ環である請求項8または9に記載の近赤外線吸収色素。
- 前記環Zは、それぞれ独立して、ピロリジン環、ピペリジン環、ピペラジン環、ピロール環、チオフェン環、イミダゾール環、ピラゾール環、チアゾール環、イソチアゾール環、オキサゾール環、イソオキサゾール環、ピリジン環、ピリミジン環、ピリダジン環、ピラジン環、トリアジン環またはトリアゾール環である請求項8に記載の近赤外線吸収色素。
- 式(AI)中、R1およびR2は、それぞれ独立して、水素原子、または炭素原子間に不飽和結合、ヘテロ原子、飽和もしくは不飽和の環構造を含んでよく、かつ置換されていてもよい炭素数が1~20の炭化水素基であり、
R3およびR4は、それぞれ独立して、水素原子、ハロゲン原子、または炭素原子間にヘテロ原子を含んでもよい炭素数1~20のアルキル基もしくはアルコキシ基である請求項8~11のいずれか1項に記載の近赤外線吸収色素。 - 式(AI)中、R1およびR2は、それぞれ独立して、炭素原子間にヘテロ原子を含んでよく、かつ置換されていてもよい炭素数1~20のアルキル基もしくはアルコキシ基である請求項8~12のいずれか1項に記載の近赤外線吸収色素。
- 前記スクアリリウム系化合物が、式(AII)で示されるスクアリリウム系化合物である請求項7に記載の近赤外線吸収色素。
R6は、それぞれ独立して、水素原子、または炭素原子間に不飽和結合、ヘテロ原子、飽和もしくは不飽和の環構造を含んでよく、かつ置換されていてもよい炭化水素基を示し、
R7は、それぞれ独立して、水素原子、ハロゲン原子、水酸基または炭素原子間にヘテロ原子を含んでもよいアルキル基もしくはアルコキシ基を示し、
R8は、それぞれ独立して、ハロゲン原子、水酸基、炭素数1~12のアルコキシ基、炭素数1~12のアシル基もしくはアシルオキシ基、炭素数1~12のパーフルオロアルキル基、または-SO2R9基(R9は、置換されていてもよい炭素数1~12のアルキル基を示す)を示し、
X2は、炭素原子間に不飽和結合、ヘテロ原子、飽和もしくは不飽和の環構造を含んでよく、かつ置換されていてもよい2価の炭化水素基を示す。 - 式(AI)で示されるスクアリリウム系化合物からなることを特徴とする近赤外線吸収色素。
環Zは、ヘテロ原子を環中に0~3個有し、かつ置換されていてもよい、5員または6員環であり、
R1とR2、R2とR3、およびR1と環Zを構成する炭素原子またはヘテロ原子は、互いに連結して窒素原子とともにそれぞれヘテロ環A、ヘテロ環Bおよびヘテロ環Cを形成していてもよく、ヘテロ環を形成していない場合、R1およびR2は、それぞれ独立して、水素原子、または炭素原子間に不飽和結合、ヘテロ原子、飽和もしくは不飽和の環構造を含んでよく、かつ置換されていてもよい炭化水素基を示し、R3は、それぞれ独立して、水素原子、ハロゲン原子、水酸基または炭素原子間にヘテロ原子を含んでもよいアルキル基もしくはアルコキシ基を示し、
R4は、それぞれ独立して、水素原子、ハロゲン原子、水酸基または炭素原子間にヘテロ原子を含んでもよいアルキル基もしくはアルコキシ基を示す。 - 前記環Zは、少なくとも1つの窒素原子または硫黄原子をヘテロ原子として含む請求項15に記載の近赤外線吸収色素。
- 前記環Zは、芳香族ヘテロ環である請求項15または請求項16に記載の近赤外線吸収色素。
- 前記環Zは、それぞれ独立して、ピロリジン環、ピペリジン環、ピペラジン環、ピロール環、チオフェン環、イミダゾール環、ピラゾール環、チアゾール環、イソチアゾール環、オキサゾール環、イソオキサゾール環、ピリジン環、ピリミジン環、ピリダジン環、ピラジン環、トリアジン環またはトリアゾール環である請求項15に記載の近赤外線吸収色素。
- 式(AII)で示されるスクアリリウム系化合物からなることを特徴とする近赤外線吸収色素。
R6は、それぞれ独立して、水素原子、または炭素原子間に不飽和結合、ヘテロ原子、飽和もしくは不飽和の環構造を含んでよく、かつ置換されていてもよい炭化水素基を示し、
R7は、それぞれ独立して、水素原子、ハロゲン原子、水酸基または炭素原子間にヘテロ原子を含んでもよいアルキル基もしくはアルコキシ基を示し、
R8は、それぞれ独立して、ハロゲン原子、水酸基、炭素数1~12のアルコキシ基、炭素数1~12のアシル基もしくはアシルオキシ基、炭素数1~12のパーフルオロアルキル基、または-SO2R9基(R9は、置換されていてもよい炭素数1~12のアルキル基を示す)を示し、
X2は、炭素原子間に不飽和結合、ヘテロ原子、飽和もしくは不飽和の環構造を含んでよく、かつ置換されていてもよい2価の炭化水素基を示す。 - 請求項1~19のいずれか1項に記載の近赤外線吸収色素と樹脂とを含有する吸収層を備えたことを特徴とする光学フィルタ。
- 入射角0°の分光透過率曲線において、波長430~550nmの光の平均透過率が90%以上であり、かつ波長430~550nmの光の最小透過率が75%以上である請求項20に記載の光学フィルタ。
- 入射角0°の分光透過率曲線において、波長430~480nmの光の平均透過率が87%以上である請求項21に記載の光学フィルタ。
- (iii-3)~(iii-6)の要件を満たす請求項22に記載の光学フィルタ。
(iii-3)入射角0°の分光透過率曲線において、波長600~700nmの光の平均透過率が25%以上である。
(iii-4)入射角0°の分光透過率曲線において、波長350~395nmの光の平均透過率が2%以下である。
(iii-5)入射角0°の分光透過率曲線において、波長710~1100nmの光の平均透過率が2%以下である。
(iii-6)入射角0°の分光透過率曲線の波長600~700nmの光の透過率と、入射角30°の分光透過率曲線における波長600nm~700nmの光の透過率との差分の絶対値の平均値が7%/nm以下である。 - 前記吸収層は、透明基材上に備えた請求項20~23のいずれか1項に記載の光学フィルタ。
- 前記透明基材は、ガラス基板である請求項24に記載の光学フィルタ。
- 前記透明基材は、近赤外線吸収ガラス基板である請求項25に記載の光学フィルタ。
- 前記透明基材は、樹脂からなる請求項24に記載の光学フィルタ。
- 前記吸収層は、樹脂基板として機能する請求項20~23のいずれか1項に記載の光学フィルタ。
- 固体撮像素子と、撮像レンズと、請求項20~28のいずれか1項に記載の光学フィルタとを備えたことを特徴とする撮像装置。
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KR20180104727A (ko) | 2018-09-21 |
JP6787347B2 (ja) | 2020-11-18 |
JP2021001342A (ja) | 2021-01-07 |
JP7014272B2 (ja) | 2022-02-15 |
US20180346729A1 (en) | 2018-12-06 |
US11059977B2 (en) | 2021-07-13 |
JPWO2017135359A1 (ja) | 2018-12-20 |
CN108603038A (zh) | 2018-09-28 |
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