WO2014136624A1 - 凹凸構造を有する部材の製造方法及びそれにより製造された凹凸構造を有する部材 - Google Patents
凹凸構造を有する部材の製造方法及びそれにより製造された凹凸構造を有する部材 Download PDFInfo
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- WO2014136624A1 WO2014136624A1 PCT/JP2014/054599 JP2014054599W WO2014136624A1 WO 2014136624 A1 WO2014136624 A1 WO 2014136624A1 JP 2014054599 W JP2014054599 W JP 2014054599W WO 2014136624 A1 WO2014136624 A1 WO 2014136624A1
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- 125000000753 cycloalkyl group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- BKGSSPASYNBWRR-UHFFFAOYSA-N dibutoxy(dipropyl)silane Chemical compound CCCCO[Si](CCC)(CCC)OCCCC BKGSSPASYNBWRR-UHFFFAOYSA-N 0.000 description 1
- OZRPZZPOPJYQPR-UHFFFAOYSA-N diethoxy(dimethyl)silane;dimethoxy(dimethyl)silane Chemical compound CO[Si](C)(C)OC.CCO[Si](C)(C)OCC OZRPZZPOPJYQPR-UHFFFAOYSA-N 0.000 description 1
- 125000004177 diethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 0.000 description 1
- JJQZDUKDJDQPMQ-UHFFFAOYSA-N dimethoxy(dimethyl)silane Chemical compound CO[Si](C)(C)OC JJQZDUKDJDQPMQ-UHFFFAOYSA-N 0.000 description 1
- YYLGKUPAFFKGRQ-UHFFFAOYSA-N dimethyldiethoxysilane Chemical compound CCO[Si](C)(C)OCC YYLGKUPAFFKGRQ-UHFFFAOYSA-N 0.000 description 1
- 238000007606 doctor blade method Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005323 electroforming Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 125000006575 electron-withdrawing group Chemical group 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- KUCGHDUQOVVQED-UHFFFAOYSA-N ethyl(tripropoxy)silane Chemical compound CCCO[Si](CC)(OCCC)OCCC KUCGHDUQOVVQED-UHFFFAOYSA-N 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 150000008376 fluorenones Chemical class 0.000 description 1
- 239000007850 fluorescent dye Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000007646 gravure printing Methods 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 229940083761 high-ceiling diuretics pyrazolone derivative Drugs 0.000 description 1
- 150000007857 hydrazones Chemical class 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 150000002460 imidazoles Chemical class 0.000 description 1
- 238000003018 immunoassay Methods 0.000 description 1
- 229910003437 indium oxide Inorganic materials 0.000 description 1
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229920000592 inorganic polymer Polymers 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000007644 letterpress printing Methods 0.000 description 1
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229910001512 metal fluoride Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 125000005641 methacryl group Chemical group 0.000 description 1
- AODWRBPUCXIRKB-UHFFFAOYSA-N naphthalene perylene Chemical group C1=CC=CC2=CC=CC=C21.C1=CC(C2=CC=CC=3C2=C2C=CC=3)=C3C2=CC=CC3=C1 AODWRBPUCXIRKB-UHFFFAOYSA-N 0.000 description 1
- LKKPNUDVOYAOBB-UHFFFAOYSA-N naphthalocyanine Chemical class N1C(N=C2C3=CC4=CC=CC=C4C=C3C(N=C3C4=CC5=CC=CC=C5C=C4C(=N4)N3)=N2)=C(C=C2C(C=CC=C2)=C2)C2=C1N=C1C2=CC3=CC=CC=C3C=C2C4=N1 LKKPNUDVOYAOBB-UHFFFAOYSA-N 0.000 description 1
- 235000012149 noodles Nutrition 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 125000002524 organometallic group Chemical group 0.000 description 1
- AHLBNYSZXLDEJQ-FWEHEUNISA-N orlistat Chemical compound CCCCCCCCCCC[C@H](OC(=O)[C@H](CC(C)C)NC=O)C[C@@H]1OC(=O)[C@H]1CCCCCC AHLBNYSZXLDEJQ-FWEHEUNISA-N 0.000 description 1
- 150000007978 oxazole derivatives Chemical class 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 125000002080 perylenyl group Chemical group C1(=CC=C2C=CC=C3C4=CC=CC5=CC=CC(C1=C23)=C45)* 0.000 description 1
- CSHWQDPOILHKBI-UHFFFAOYSA-N peryrene Natural products C1=CC(C2=CC=CC=3C2=C2C=CC=3)=C3C2=CC=CC3=C1 CSHWQDPOILHKBI-UHFFFAOYSA-N 0.000 description 1
- 150000004986 phenylenediamines Chemical class 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical class N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920000747 poly(lactic acid) Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920001195 polyisoprene Polymers 0.000 description 1
- 239000004626 polylactic acid Substances 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 229920002717 polyvinylpyridine Polymers 0.000 description 1
- 150000004033 porphyrin derivatives Chemical class 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 description 1
- JEXVQSWXXUJEMA-UHFFFAOYSA-N pyrazol-3-one Chemical class O=C1C=CN=N1 JEXVQSWXXUJEMA-UHFFFAOYSA-N 0.000 description 1
- LISFMEBWQUVKPJ-UHFFFAOYSA-N quinolin-2-ol Chemical compound C1=CC=C2NC(=O)C=CC2=C1 LISFMEBWQUVKPJ-UHFFFAOYSA-N 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000010076 replication Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- YYMBJDOZVAITBP-UHFFFAOYSA-N rubrene Chemical compound C1=CC=CC=C1C(C1=C(C=2C=CC=CC=2)C2=CC=CC=C2C(C=2C=CC=CC=2)=C11)=C(C=CC=C2)C2=C1C1=CC=CC=C1 YYMBJDOZVAITBP-UHFFFAOYSA-N 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000001338 self-assembly Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 229910052950 sphalerite Inorganic materials 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- OQTSOKXAWXRIAC-UHFFFAOYSA-N tetrabutan-2-yl silicate Chemical compound CCC(C)O[Si](OC(C)CC)(OC(C)CC)OC(C)CC OQTSOKXAWXRIAC-UHFFFAOYSA-N 0.000 description 1
- UQMOLLPKNHFRAC-UHFFFAOYSA-N tetrabutyl silicate Chemical compound CCCCO[Si](OCCCC)(OCCCC)OCCCC UQMOLLPKNHFRAC-UHFFFAOYSA-N 0.000 description 1
- IFLREYGFSNHWGE-UHFFFAOYSA-N tetracene Chemical compound C1=CC=CC2=CC3=CC4=CC=CC=C4C=C3C=C21 IFLREYGFSNHWGE-UHFFFAOYSA-N 0.000 description 1
- 150000004867 thiadiazoles Chemical class 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- VUWVDNLZJXLQPT-UHFFFAOYSA-N tripropoxy(propyl)silane Chemical compound CCCO[Si](CCC)(OCCC)OCCC VUWVDNLZJXLQPT-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
- 238000004383 yellowing Methods 0.000 description 1
- 229910052984 zinc sulfide Inorganic materials 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0012—Arrays characterised by the manufacturing method
- G02B3/0031—Replication or moulding, e.g. hot embossing, UV-casting, injection moulding
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/20—Changing the shape of the active layer in the devices, e.g. patterning
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
- Y10T428/24612—Composite web or sheet
Definitions
- the present invention relates to a method for producing a member having a concavo-convex structure using a microcontact printing method.
- Lithography is known as a method for forming a fine pattern such as a semiconductor integrated circuit.
- the resolution of the pattern formed by the lithography method depends on the wavelength of the light source and the numerical aperture of the optical system.
- a light source having a shorter wavelength is desired.
- short wavelength light sources are expensive, and their development is not easy, and development of optical materials that transmit such short wavelength light is also necessary.
- manufacturing a large-area pattern by a conventional lithography method requires a large optical element, and is difficult both technically and economically. Therefore, a new method for forming a desired pattern having a large area has been studied.
- a nanoimprint method is known as a method for forming a fine pattern without using a conventional lithography apparatus.
- the nanoimprint method is a technology that can transfer nanometer-order patterns by sandwiching a resin between a mold and a substrate, and not only semiconductor devices but also optical members such as organic EL elements and LEDs, MEMS, and biotechnology. Practical use is expected in many fields such as chips.
- thermosetting material for example, a method of applying a resist film to a substrate, pressing it with a flat mold, and curing the resist film with a heater as described in Patent Document 1 is known.
- a nanoimprint molded article using an inorganic sol-gel material has high heat resistance and is suitable for a process involving high-temperature treatment.
- a roll press method using a metal replication master having a cylindrical fine uneven pattern and a press roll as described in Patent Document 2 is also known.
- a metallic replica master is formed by electroforming or the like and is expensive, mass production is not easy.
- a nanoimprint method using a resin stamp there is a microcontact printing method as described in Patent Document 3.
- the resin stamp used in the microcontact printing method has an advantage that it can be copied inexpensively and easily.
- An object of the present invention is to provide a novel manufacturing method capable of efficiently mass-producing a member having a fine uneven structure.
- a method for producing a member having a concavo-convex structure Preparing a stamp having a concavo-convex pattern; Applying a concavo-convex forming material to the convex portions of the stamp; Transferring the unevenness forming material onto the substrate by bringing the stamp coated with the unevenness forming material into contact with the substrate;
- a method for producing a member having a concavo-convex structure including a step of applying a concavo-convex coating material on the substrate so as to cover the transferred concavo-convex forming material.
- the concavo-convex structure layer made of the concavo-convex forming material and the concavo-convex coating material may be formed on the substrate by applying the concavo-convex coating material on the substrate.
- the concavo-convex forming material may be a sol-gel material.
- the uneven coating material may be a sol-gel material.
- the member having an uneven structure may be an optical substrate.
- the stamp may be formed from silicone rubber.
- the unevenness forming material may have a viscosity higher than that of the uneven covering material.
- the concavo-convex forming material may be heated in the step of transferring the concavo-convex forming material onto the substrate.
- the heating temperature of the unevenness forming material may be 150 to 200 ° C.
- the height of the transferred concavo-convex forming material may be adjusted by the solid content concentration of the concavo-convex forming material.
- the thickness of the applied concavo-convex coating material may be adjusted by the solid content concentration of the concavo-convex coating material.
- a member having a concavo-convex structure on the substrate obtained by the method for producing a member having a concavo-convex structure of the first aspect.
- an organic EL element manufacturing method for manufacturing an organic EL element using the member having the concavo-convex structure of the second aspect.
- an optical member having a concavo-convex structure comprising a substrate and a plurality of convex portions formed of a material different from the substrate and isolated from each other on the surface of the substrate.
- An optical member is provided that includes an island-like structure and a covering portion that covers the island-like structure and a substrate surface exposed between the convex portions.
- Both the convex part and the covering part may be formed of a sol-gel material.
- coated part may be formed from a different material.
- the optical member is suitable for a light extraction substrate for organic EL.
- the method for producing a member having a concavo-convex structure according to the present invention can efficiently and easily produce a member having a fine concavo-convex structure such as an optical substrate.
- the uneven pattern of the member manufactured by the manufacturing method of the present invention may be formed from a sol-gel material.
- the manufactured member is excellent in heat resistance, weather resistance (concept including light resistance) and corrosion resistance, and the member It is also resistant to the manufacturing process of the element incorporating the element, and the life of the element can be extended. Therefore, the member having a concavo-convex structure obtained by the production method of the present invention is extremely effective for various devices such as an organic EL element and a solar cell, and the member having the concavo-convex structure thus obtained is used.
- An organic EL device having excellent heat resistance, weather resistance and corrosion resistance can be produced.
- FIGS. 2A to 2C are diagrams conceptually showing each process of manufacturing a microcontact printing stamp used in the method for manufacturing an optical substrate of the embodiment.
- 3A to 3C are diagrams conceptually showing each step of the transfer process by the micro contact printing method. It is a key map of the section structure of the optical substrate manufactured by the manufacturing method of the optical substrate of an embodiment. It is a figure which shows the cross-section of an organic EL element.
- a sol-gel material will be described as an example of the material of the concavo-convex structure layer formed on the substrate. As shown in FIG.
- the method for producing a member having a concavo-convex pattern or concavo-convex structure mainly includes a step S1 for preparing a microcontact print stamp (mold), a step S2 for preparing a concavo-convex forming material, Step S3 for applying the concave / convex forming material to the convex portions of the microcontact print stamp, Step S4 for transferring the applied concave / convex forming material onto the substrate, Step S5 for preparing the concave / convex coating material, and applying the concave / convex coating material on the substrate.
- Step S6 has a curing step S7 for curing the concavo-convex structure layer made of the concavo-convex forming material and the concavo-convex covering material.
- a curing step S7 for curing the concavo-convex structure layer made of the concavo-convex forming material and the concavo-convex covering material.
- a stamp used for microcontact printing is made of an elastically deformable material and has a concavo-convex transfer pattern on the surface.
- the stamp can be manufactured by a stamp manufacturing method described later.
- a rubber-based material is preferable as the elastically deformable material, and silicone rubber, or a mixture or copolymer of silicone rubber and other materials is particularly preferable.
- silicone rubber examples include polyorganosiloxane such as polydimethylsiloxane (PDMS), cross-linked polyorganosiloxane, polyorganosiloxane / polycarbonate copolymer, polyorganosiloxane / polyphenylene copolymer, and polyorganosiloxane / polystyrene copolymer. Polymers, polytrimethylsilylpropyne, poly-4-methylpentene and the like are used. Silicone rubber is less expensive than other resin materials, has excellent heat resistance, high thermal conductivity, elasticity, and is not easily deformed under high temperature conditions, making it suitable for uneven pattern transfer processes performed under high temperature conditions It is.
- PDMS polydimethylsiloxane
- Polycarbonate copolymer polyorganosiloxane / polyphenylene copolymer
- polyorganosiloxane / polystyrene copolymer polystyrene copolymer.
- the stamp can be, for example, 50 to 1000 mm long, 50 to 3000 mm wide, and 1 to 50 mm thick.
- the dimensions of the stamp can be set as appropriate depending on the dimensions of the optical substrate to be mass produced. If the thickness of the stamp is smaller than the lower limit, the strength of the stamp is reduced, and there is a risk of damage during handling of the stamp. When the thickness is larger than the above upper limit, it becomes difficult to peel off from the master mold during stamp production. Moreover, you may perform a mold release process on the uneven
- the concavo-convex pattern can be formed in an arbitrary shape by an arbitrary method such as a BCP method, a BKL method, or a photolithography method described later.
- the concavo-convex pattern of the stamp can be an arbitrary pattern depending on the use of the optical substrate finally obtained, such as a microlens array structure or a structure having functions such as light diffusion and diffraction.
- the concavo-convex pitch is uniform.
- it may be an irregular concavo-convex pattern in which the direction of the concavo-convex has no directivity.
- the average pitch of the irregularities can be in the range of 100 to 1500 nm, and more preferably in the range of 200 to 1200 nm.
- the first sol-gel solution is transferred only to the portion corresponding to the convex portion of the stamp on the substrate, and the concave / convex depth of the stamp at that time is relative to the pattern pitch to be used. About 1 to 10 times is desirable. If the unevenness depth of the stamp is smaller than the lower limit, the unevenness forming material is transferred in addition to the intended portion on the substrate in the transfer process using the stamp. On the other hand, when the unevenness depth of the stamp is larger than the upper limit, the shape of the stamp is deformed in the transfer process, and the shape of the transfer pattern of the unevenness forming material is destroyed, and a desired pattern may not be obtained.
- the average pitch of the unevenness means the average value of the unevenness pitch when the unevenness pitch on the surface where the unevenness is formed (adjacent protrusions or adjacent recesses).
- the average value of the pitch of such irregularities is as follows using a scanning probe microscope (for example, product name “E-sweep” manufactured by Hitachi High-Tech Science Co., Ltd.): Measuring method: Cantilever intermittent contact method
- Cantilever material Silicon Cantilever lever width: 40 ⁇ m
- Cantilever tip tip diameter 10 nm
- the master mold 38 for forming the uneven pattern of the stamp is manufactured.
- the master mold 38 is formed from, for example, a quartz substrate or a silicon substrate.
- the concave / convex pattern of the master mold 38 is, for example, a method using the self-organization (microphase separation) of a block copolymer described in the international application PCT / JP2012 / 050564 by the present applicants (hereinafter referred to as “BCP” as appropriate).
- BKL (Buckling) method a method of forming irregularities due to wrinkles on the polymer surface by heating and cooling the polymer film on the deposited film disclosed in WO2011 / 007878A1 by the present applicants.
- BKL (Buckling) method a method of forming irregularities due to wrinkles on the polymer surface by heating and cooling the polymer film on the deposited film disclosed in WO2011 / 007878A1 by the present applicants
- BKL (Buckling) method can be used.
- the substrate is then etched in the depth direction using the concavo-convex pattern as a mask, whereby a master having a rectangular cross-sectional structure
- the mold 38 can be produced.
- the unevenness of the master mold 38 can also be achieved by, for example, a micromachining method such as a cutting method, a direct electron beam drawing method, a particle beam beam machining method, and an operation probe machining method, and a micromachining method using self-assembly of fine particles.
- a pattern can be produced.
- any material can be used for forming the pattern, but a styrene polymer such as polystyrene, a polyalkyl methacrylate such as polymethyl methacrylate, a poly A block copolymer composed of two combinations selected from the group consisting of ethylene oxide, polybutadiene, polyisoprene, polyvinyl pyridine, and polylactic acid is preferable.
- an analytical image of the concave / convex pattern produced by the BCP method or BKL method is acquired using a scanning probe microscope, and the exposure pattern is used based on the obtained analytical image.
- Mask data is produced, an exposure mask is produced by a normal photomask production process using the produced data, and exposure is performed on a master mold 38 substrate such as a quartz substrate using the produced exposure mask.
- the master mold 38 can be produced by performing etching.
- the concavo-convex pattern of the master mold 38 can be an arbitrary pattern according to the use of the optical substrate finally obtained, such as a microlens array structure or a structure having functions such as light diffusion and diffraction.
- the pitch and height of the concavo-convex pattern are arbitrary.
- the average pitch of the concavo-convex pattern is in the range of 100 to 1500 nm. It is preferable that it is in the range of 200 to 1200 nm.
- a stamp 83 to which the pattern of the master mold 38 is transferred is formed as follows.
- the main agent which is a raw material of the rubber material, and the curing agent are mixed and stirred for 10 minutes.
- a mixture of rubber materials (hereinafter also referred to as “stamp raw material” as appropriate) may be diluted with a solvent such as toluene.
- stamp raw material After stirring the stamp material, it is degassed under reduced pressure. The defoamed stamp raw material is applied onto the concave / convex pattern of the master mold 38 prepared previously (FIG. 2B).
- any coating method such as a casting method, a doctor blade method, or a spin coating method can be used.
- the stamp material is heated to cure the applied stamp material.
- the heating temperature is preferably room temperature to 50 ° C. Heating can be performed by any means such as an oven or a hot plate.
- the cured stamp material is peeled off from the master mold 38 to obtain a stamp 83 for microcontact printing having a concavo-convex pattern composed of convex portions 83aa and concave portions 83ab (FIG. 2C).
- the stamp 83 can be peeled off from the end of the master mold 38.
- a first sol-gel material used as an unevenness forming material for transferring a pattern to a substrate is prepared by a microcontact printing method (step S2 in FIG. 1).
- a sol-gel material of metal alkoxide is prepared as a first sol-gel material (unevenness forming material).
- TMOS tetramethoxysilane
- TEOS tetraethoxysilane
- tetra-i-propoxysilane tetra-n-propoxysilane
- tetra-i-butoxysilane tetra-n-butoxysilane
- tetra-n-butoxysilane tetra-n-butoxysilane
- tetra- Tetraalkoxide monomers such as sec-butoxysilane and tetra-t-butoxysilane, methyltrimethoxysilane, ethyltrimethoxysilane, propyltrimethoxysilane, isopropyltrimethoxysilane, phenyltrimethoxysilane, methyltriethoxysilane (MTES) , Ethyltriethoxysilane, propyltriethoxysilane, isopropyltriethoxysilane,
- Dialkoxide monomers polymers obtained by polymerizing these monomers in small amounts, and metal alkoxides such as composite materials in which a functional group or polymer is introduced into a part of the material.
- metal acetylacetonate, metal carboxylate, oxychloride, chloride, a mixture thereof and the like can be mentioned, but not limited thereto.
- the metal species include, but are not limited to, Ti, Sn, Al, Zn, Zr, In, and a mixture thereof in addition to Si. What mixed suitably the precursor of the said metal oxide can also be used.
- the mixing ratio can be 1: 1, for example, in a molar ratio.
- This sol-gel material produces amorphous silica by performing hydrolysis and polycondensation reactions.
- an acid such as hydrochloric acid or an alkali such as ammonia is added.
- the pH is preferably 4 or less or 10 or more.
- the amount of water to be added can be 1.5 times or more in molar ratio with respect to the metal alkoxide species.
- materials other than silica on the substrate by the sol-gel method.
- Ti-based materials, ITO (indium-tin-oxide) -based materials, Al 2 O 3 , ZrO 2 , ZnO, etc. are used. Can do.
- Examples of the solvent for the first sol-gel material include alcohols such as methanol, ethanol, isopropyl alcohol (IPA) and butanol, aliphatic hydrocarbons such as hexane, heptane, octane, decane and cyclohexane, benzene, toluene, xylene and mesitylene.
- alcohols such as methanol, ethanol, isopropyl alcohol (IPA) and butanol
- aliphatic hydrocarbons such as hexane, heptane, octane, decane and cyclohexane
- benzene toluene
- xylene xylene
- mesitylene mesitylene
- Aromatic hydrocarbons such as diethyl ether, tetrahydrofuran, dioxane, etc., ketones such as acetone, methyl ethyl ketone, isophorone, cyclohexanone, butoxyethyl ether, hexyloxyethyl alcohol, methoxy-2-propanol, benzyloxyethanol, etc.
- Ether alcohols glycols such as ethylene glycol and propylene glycol, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, Glycol ethers such as pyrene glycol monomethyl ether acetate, esters such as ethyl acetate, ethyl lactate and ⁇ -butyrolactone, phenols such as phenol and chlorophenol, N, N-dimethylformamide, N, N-dimethylacetamide, N- Examples include amides such as methylpyrrolidone, halogen-based solvents such as chloroform, methylene chloride, tetrachloroethane, monochlorobenzene, and dichlorobenzene, hetero-containing compounds such as carbon disulfide, water, and mixed solvents thereof. In particular, ethanol and isopropyl alcohol are preferable, and those in which water is mixed are also preferable.
- Additives for the first sol-gel material include polyethylene glycol, polyethylene oxide, hydroxypropyl cellulose, polyvinyl alcohol for viscosity adjustment, alkanolamines such as triethanolamine which are solution stabilizers, ⁇ -diketones such as acetylacetone, ⁇ -Ketoesters, formamide, dimethylformamide, dioxane and the like can be used.
- the first sol-gel material can maintain the size of the convex portion of the stamp when the pattern is transferred by bringing the first sol-gel material applied to the microcontact printing stamp into contact with the substrate (the size of the convex portion).
- the viscosity of the first sol-gel material is preferably 0.01 to 100 Pa ⁇ s or more. The viscosity of the first sol-gel material can be adjusted depending on the solid content concentration and the type of the solvent in addition to the additive.
- a photo-curable sol-gel material may be used as the first sol-gel material.
- a photoacid generator such as phosphorus hexafluoride aromatic sulfonium salt that generates an acid by light
- a ⁇ -diketone typified by acetylacetone
- resin materials can also be used as an uneven
- the curable resin include resins such as photocuring and thermosetting, moisture curing type, and chemical curing type (two-component mixing). Specifically, epoxy, acrylic, methacrylic, vinyl ether, oxetane, urethane, melamine, urea, polyester, polyolefin, phenol, cross-linked liquid crystal, fluorine, silicone, polyamide And various resins such as monomers, oligomers and polymers. Alternatively, an inorganic material or a curable resin material containing an ultraviolet absorbing material may be used.
- the ultraviolet absorbing material has an action of suppressing deterioration of the film by absorbing ultraviolet rays and converting light energy into a harmless form such as heat.
- the ultraviolet absorber conventionally known ones can be used.
- a benzotriazole-based absorbent, a triazine-based absorbent, a salicylic acid derivative-based absorbent, a benzophenone-based absorbent, or the like can be used.
- the first sol-gel material (unevenness forming material) prepared as described above is applied to the protrusions of the microcontact print stamp (step S3 in FIG. 1).
- the coating film 52 of the first sol-gel material (unevenness forming material) is formed on the protrusion 83aa of the stamp 83 having the uneven pattern 83a.
- the first sol-gel material may be attached to the concave portion 83ab of the stamp 83 as long as the pattern of the convex portion 83aa of the stamp 83 is reflected on the substrate in the transfer step described later.
- any coating method such as a bar coating method, a spin coating method, a spray coating method, a dip coating method, a die coating method, and an ink jet method can be used, but a sol-gel material is uniformly applied to a stamp having a relatively large area.
- the bar coating method, the die coating method, and the spin coating method are preferable because the coating can be completed quickly before the first sol-gel material is cured (gelled).
- the stamp may be formed into a roll shape, and the sol-gel material may be applied to the convex portion of the stamp by immersing the roll-shaped stamp in a shallow sol-gel material filled in a container and rotating the stamp.
- the roll-shaped stamp can be produced by, for example, winding the stamp around a hard roll such as metal.
- the film thickness of the coating film of the first sol-gel material applied to the convex portion of the stamp is preferably 300 to 10,000 nm.
- the film thickness of the coating film of the first sol-gel material can be prepared by, for example, the viscosity of the first sol-gel material.
- the hydrophobizing treatment can be performed with dimethyldichlorosilane, trimethylalkoxysilane, or the like, or trimethylsilyl such as hexamethyldisilazane.
- a method of hydrophobizing with an agent and silicone oil may be used, or a surface treatment method of metal oxide powder using supercritical carbon dioxide may be used.
- the pattern of the stamp 83 is transferred to the substrate 40 by the micro contact printing method (step S4 in FIG. 1).
- the substrate 40 is disposed immediately below the stamp 83 on which the coating film 52 of the first sol-gel material is formed, and then, as shown in FIG. The coating film 52 of the first sol-gel material formed on 83aa is brought into contact with the substrate 40.
- a substrate made of an inorganic material such as glass, quartz, silicon substrate, polyethylene terephthalate (PET), polyethylene terephthalate (PEN), polycarbonate (PC), cycloolefin polymer (COP), polymethyl methacrylate (PMMA),
- a resin substrate such as polystyrene (PS), polyimide (PI), polyarylate, or the like can be used, but a glass substrate is desirable because of its high adhesive force with the sol-gel material. Since the adhesive force between the sol-gel material and the substrate 40 is high, the pattern of the stamp 83 can be accurately transferred to the substrate 40.
- the substrate 40 may be a substrate whose surface is subjected to a hydrophilic treatment by O 3 treatment or the like.
- the substrate 40 may be transparent (light transmissive) or opaque. If the concavo-convex pattern substrate obtained from the substrate 40 is used for manufacturing an organic EL element to be described later, the substrate 40 is preferably a substrate having heat resistance, light resistance against UV light and the like. From this viewpoint, the substrate 40 is more preferably a substrate made of an inorganic material such as glass, quartz, or a silicon substrate. In order to improve adhesion, a surface treatment or an easy adhesion layer may be provided on the substrate 40, or a gas barrier layer may be provided for the purpose of preventing intrusion of gas such as moisture or oxygen. Good.
- the stamp 83 is isolated from the substrate 40, and the stamp 83 is peeled off (FIG. 3C).
- the coating film 52 of the first sol-gel material formed on the convex portion 83aa of the stamp 83 is transferred onto the substrate 40, and the first sol-gel material is formed on the substrate 40 so as to correspond to the pattern of the convex portion 83aa of the stamp 83.
- the island-like structure 54 in which the areas (projections) are scattered is formed.
- the “island structure” refers to an aggregate of a plurality of structures (or projections) that are isolated or separated from each other on the substrate so as to protrude from the substrate.
- Such a structure may be a structure whose cross section perpendicular to the substrate surface has various shapes such as a square shape such as a trapezoid, a mountain shape (triangle), and a semicircle. Structures that make point contact with the surface of the substrate, such as a circle, are not included. In this island structure, the structures (or projections) are isolated from each other at a predetermined interval on the substrate, so that the substrate surface is exposed between the structures.
- the height of the convex portion in the island-like structure 54 made of the first sol-gel material (unevenness forming material) is preferably 300 to 10,000 nm.
- the height of the convex part in the island-like structure 54 can be adjusted by the film thickness of the coating film 52 of the first sol-gel material, for example. If the roll-shaped stamp described above is used, the stamp is peeled off from the substrate 40 while the first sol-gel material is transferred onto the substrate simply by rolling the roll-shaped stamp coated with the first sol-gel material on the substrate 40. be able to.
- the coating film 52 of the first sol-gel material When the coating film 52 of the first sol-gel material is brought into contact with the substrate 40, the coating film 52 may be heated. By heating, the chemical reaction of the sol-gel material in the coating film 52 and the evaporation of water and solvent generated thereby are promoted, and the curing of the coating film 52 proceeds. Therefore, the uncured coating film 52 can be prevented from being transferred to the substrate 40 by spreading over the size of the convex portion 83aa of the stamp 83. Further, it is possible to prevent the uncured coating film 42 from remaining on the convex portion 83aa of the stamp 83 after the transfer.
- the film thickness of the first sol-gel material applied to the stamp 83 may change or remain when the stamp 83 is reused and pattern transfer is performed by microcontact printing.
- the coated film 52 may be cured to cause particles.
- the coating film 52 may be heated through the stamp 83, or the coating film 52 may be heated from the substrate 40 side or directly.
- Arbitrary heating means can be used for heating. For example, when heating from the substrate 40 side, a hot plate can be installed on the back side of the substrate 40 to heat.
- the heating temperature of the coating film 52 depends on the speed at which the substrate 40 is processed, a higher temperature is desirable, and a temperature close to the heat resistant temperature of the stamp 83 is desirable.
- the stamp 83 is made of polydimethylsiloxane (PDMS)
- the heating temperature of the coating film 52 of the first sol-gel material is preferably 150 to 200 ° C.
- gelation may proceed by irradiating energy rays such as ultraviolet rays and excimers instead of heating the coating film 52.
- a second sol-gel material used as an uneven covering material to be applied on a substrate on which an island-like structure of the first sol-gel material is formed is prepared (step S5 in FIG. 1).
- a metal alkoxide (silica precursor) sol-gel material is prepared as a second sol-gel material (unevenness coating material) in the same manner as the first sol-gel material.
- tetramethoxysilane TMOS
- TEOS tetraethoxysilane
- tetra-i-propoxysilane tetra-n-propoxysilane
- tetra-i-butoxysilane tetra Tetraalkoxide monomers
- -n-butoxysilane tetra-sec-butoxysilane
- tetra-t-butoxysilane methyltrimethoxysilane, ethyltrimethoxysilane, propyltrimethoxysilane, isopropyltrimethoxysilane, phenyltrimethoxysilane , Methyltriethoxysilane (MTES), ethyltriethoxysilane, propyltriethoxysilane, isopropyltriethoxysilane, phenyltriethoxysilane, phenyltriethoxysilane, is
- metal acetylacetonate metal carboxylate, oxychloride, chloride, a mixture thereof and the like can be mentioned, but not limited thereto.
- the metal species include, but are not limited to, Ti, Sn, Al, Zn, Zr, In, and a mixture thereof in addition to Si. What mixed suitably the precursor of the said metal oxide can also be used.
- the mixing ratio can be 1: 1, for example, in a molar ratio.
- This sol-gel material produces amorphous silica by performing hydrolysis and polycondensation reactions.
- an acid such as hydrochloric acid or an alkali such as ammonia is added.
- the pH is preferably 4 or less or 10 or more.
- the amount of water to be added can be 1.5 times or more in molar ratio with respect to the metal alkoxide species. It is also possible to form a material other than silica on the substrate by the sol-gel method.
- a Ti-based material, an ITO (indium-tin-oxide) -based material, Al 2 O 3 , ZrO 2 , ZnO or the like is used. obtain.
- the optical substrate obtained by the present embodiment is used as a light extraction substrate of an organic EL element, if the refractive index of the first sol-gel material and the second sol-gel material are different, the layer made of the first sol-gel material on the optical substrate and the second Since the light may be totally reflected at the interface of the layer made of the sol-gel material and the light extraction effect may be reduced, it is desirable to use the same material as the first sol-gel material for the second sol-gel material.
- the solvent for the second sol-gel material for example, alcohols such as methanol, ethanol, isopropyl alcohol (IPA) and butanol, and aliphatic hydrocarbons such as hexane, heptane, octane, decane and cyclohexane are used as in the first sol-gel material.
- alcohols such as methanol, ethanol, isopropyl alcohol (IPA) and butanol
- aliphatic hydrocarbons such as hexane, heptane, octane, decane and cyclohexane are used as in the first sol-gel material.
- Aromatic hydrocarbons such as benzene, toluene, xylene and mesitylene, ethers such as diethyl ether, tetrahydrofuran and dioxane, ketones such as acetone, methyl ethyl ketone, isophorone and cyclohexanone, butoxyethyl ether, hexyloxyethyl alcohol, methoxy- Ether alcohols such as 2-propanol and benzyloxyethanol, glycols such as ethylene glycol and propylene glycol, ethylene glycol dimethyl ether, diethylene glycol Glycol ethers such as dimethyl ether and propylene glycol monomethyl ether acetate, esters such as ethyl acetate, ethyl lactate and ⁇ -butyrolactone, phenols such as phenol and chlorophenol, N, N-dimethylformamide, N, N-dimethyl Amides such as acetamide,
- polyethylene glycol, polyethylene oxide, hydroxypropyl cellulose, polyvinyl alcohol for viscosity adjustment, alkanolamines such as triethanolamine which is a solution stabilizer, ⁇ -diketone such as acetylacetone, ⁇ -ketoester, formamide, dimethylformamide, dioxane and the like can be used.
- alkanolamines such as triethanolamine which is a solution stabilizer
- ⁇ -diketone such as acetylacetone, ⁇ -ketoester
- formamide dimethylformamide, dioxane and the like
- the viscosity of the second sol-gel material is 0.001 to 10 Pa ⁇ s It is preferable that The viscosity of the second sol-gel material can be adjusted depending on the solid content concentration and the type of the solvent, but is preferably lower than the viscosity of the first sol-gel material from the viewpoint of the above and the application work.
- a photo-curable sol-gel material may be used in addition to the sol-gel material that is cured by heating.
- a photoacid generator such as a phosphorus hexafluoride aromatic sulfonium salt that generates an acid by light is used, or a ⁇ -diketone typified by acetylacetone is added to the sol solution.
- a method of chemically modifying (chelating) and removing the chemical modification by irradiation with energy rays such as ultraviolet rays and excimers can be used.
- uneven coating material TiO 2, ZnO, ZnS, ZrO, may be composed of an inorganic material such as BaTiO 3, SrTiO 2. Of these, TiO 2 is preferable in terms of film formability and refractive index.
- a curable resin material may be used as the uneven coating material.
- a resin such as photo-curing and thermosetting, moisture-curing type, and chemical-curing type (two-component mixing) can be used as in the case of the base material.
- epoxy acrylic, methacrylic, vinyl ether, oxetane, urethane, melamine, urea, polyester, polyolefin, phenol, cross-linkable liquid crystal, fluorine, silicone, polyamide
- various resins such as monomers, oligomers and polymers.
- a silane coupling agent as an uneven
- the adhesion between a concavo-convex structure layer described later and a layer such as an electrode formed thereon can be improved. Resistance in a cleaning process and a high-temperature treatment process in the EL element manufacturing process is improved.
- the type of the silane coupling agent used in the coating layer is not particularly limited.
- RSiX 3 R is selected from a vinyl group, a glycidoxy group, an acrylic group, a methacryl group, an amino group, and a mercapto group.
- An organic functional group containing at least one kind, and X is a halogen element or an alkoxyl group) can be used.
- methods for applying the silane coupling agent include spin coating, spray coating, dip coating, dropping, gravure printing, screen printing, letterpress printing, die coating, curtain coating, ink jet, and sputtering.
- Various coating methods such as a method can be employed.
- a cured film can be obtained by drying under appropriate conditions according to each material. For example, heat drying may be performed at 100 to 150 ° C. for 15 to 90 minutes.
- the uneven coating material may be an inorganic material or a curable resin material containing an ultraviolet absorbing material.
- the ultraviolet absorbing material has an action of suppressing deterioration of the film by absorbing ultraviolet rays and converting light energy into a harmless form such as heat.
- the ultraviolet absorber conventionally known ones can be used.
- a benzotriazole-based absorbent, a triazine-based absorbent, a salicylic acid derivative-based absorbent, a benzophenone-based absorbent, or the like can be used.
- a polysilazane solution may be used as the uneven coating material.
- the coating film formed by applying this may be converted into a ceramic (silica modification) to form a film made of silica.
- “Polysilazane” is a polymer having a silicon-nitrogen bond, such as SiO 2 , Si 3 N 4 made of Si—N, Si—H, N—H, etc., and ceramics such as both intermediate solid solutions SiO X N Y. It is a precursor inorganic polymer. More preferred is a compound which is converted to silica by being ceramicized at a relatively low temperature as represented by the following general formula (1) described in JP-A-8-112879.
- R1, R2, and R3 each represent a hydrogen atom, an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group, an alkylsilyl group, an alkylamino group, or an alkoxy group.
- perhydropolysilazane also referred to as PHPS
- R 1, R 2 and R 3 are hydrogen atoms, and the hydrogen part bonded to Si is partially an alkyl group or the like.
- Substituted organopolysilazanes are particularly preferred.
- silicon alkoxide-added polysilazane obtained by reacting polysilazane with silicon alkoxide for example, JP-A No. 5-23827
- glycidol-added polysilazane obtained by reacting glycidol for example, JP-A-6-122852
- an alcohol-added polysilazane obtained by reacting an alcohol for example, JP-A-6-240208
- a metal carboxylate-added polysilazane obtained by reacting a metal carboxylate for example, JP-A-6-299118
- an acetylacetonate complex-added polysilazane obtained by reacting a metal-containing acetylacetonate complex for example, JP-A-6-306329
- metal fine particles Pressurized polysilazane (e.g., JP-A-7-196986)
- hydrocarbon solvents such as aliphatic hydrocarbons, alicyclic hydrocarbons and aromatic hydrocarbons, halogenated hydrocarbon solvents, ethers such as aliphatic ethers and alicyclic ethers can be used.
- an amine or metal catalyst may be added.
- the same material may be used for an uneven
- the concavo-convex forming material and the concavo-convex coating material may both use a sol-gel material, use a sol-gel material for the concavo-convex forming material, use a material other than the concavo-convex coating material, and vice versa.
- a resin material may be used as the unevenness forming material, and polysilazane may be used as the unevenness covering material. Even when the concavo-convex forming material and the concavo-convex covering material are the same or similar, they may be deposited so that their compositions and densities are different.
- the second sol-gel material (unevenness covering material) prepared as described above is applied on the substrate 40 on which the island-like structure 54 of the first sol-gel material is formed (step S6 in FIG. 1).
- a coating film 62 of the second sol-gel material (unevenness covering material) is formed so as to cover the island-like structure 54 of the first sol-gel material.
- the second sol-gel material (part of the second sol-gel material) that does not cover the island-like structure 54 covers the substrate 40 (exposed portion of the substrate) and is in contact with the substrate 40.
- the sol-gel material layer (uneven structure layer) 42 formed of the first sol-gel material island-like structure 54 and the second sol-gel material coating 62 has a corrugated portion having a convex portion corresponding to the island-like structure 54 of the first sol-gel material.
- a structure can be formed. Since the formed uneven pattern has a smooth waveform structure, when the produced optical substrate is used for manufacturing an organic EL element and an organic layer is deposited on the uneven surface, the thickness of a part of the organic layer is reduced. It is considered that it can be sufficiently prevented from becoming extremely thin and the organic layer can be laminated with a sufficiently uniform film thickness. As a result, the distance between the electrodes can be made sufficiently uniform, and the concentration of the electric field can be sufficiently suppressed. Further, in the organic EL element, it is considered that the generation of leakage current can be more sufficiently suppressed because the gradient of the potential distribution at the inclined portion of the corrugated structure has a gentle slope.
- the film thickness of the coating film 62 of the second sol-gel material needs to be adjusted according to the uneven shape required for the optical substrate. For example, when it is desired that the depth of the corrugated structure of the finally obtained optical substrate is 500 nm, the film thickness of the coating film 62 of the second sol-gel material is the island-shaped structure 54 formed of the first sol-gel material. What is necessary is just to make it thin by 500 nm with respect to the height.
- the film thickness of the coating film 62 can be prepared by, for example, the solid content concentration of the second sol-gel material.
- the concavo-convex pattern of the sol-gel material layer (concavo-convex structure layer) 42 can be any pattern depending on the use of the optical substrate finally obtained, such as a microlens array structure or a structure having functions such as light diffusion and diffraction. .
- the pitch and height of the concavo-convex pattern are arbitrary. For example, when the pattern is used for a diffraction grating that scatters or diffracts light in the visible region, the average pitch of the concavo-convex pattern is in the range of 100 to 1500 nm. It is preferable that it is in the range of 200 to 1200 nm.
- the average value of the uneven depth distribution is preferably in the range of 20 to 200 nm, and more preferably in the range of 30 to 150 nm.
- the standard deviation of the depth of the unevenness is preferably in the range of 10 to 100 nm, and more preferably in the range of 15 to 75 nm.
- the surface of the sol-gel material layer may be subjected to a hydrophobic treatment. A known method may be used for the hydrophobizing treatment.
- the surface is silica
- it can be hydrophobized with dimethyldichlorosilane, trimethylalkoxysilane, or the like, or trimethylsilyl such as hexamethyldisilazane.
- a method of hydrophobizing with an agent and silicone oil may be used, or a surface treatment method of metal oxide powder using supercritical carbon dioxide may be used.
- a gas barrier layer may be provided on the sol-gel material layer for the purpose of preventing intrusion of gases such as moisture and oxygen.
- corrugated depth are computable as follows.
- An unevenness analysis image is measured by using a scanning probe microscope (for example, product name “E-sweep” manufactured by Hitachi High-Tech Science Co., Ltd.) for the surface unevenness shape.
- an unevenness analysis image is obtained by measuring an arbitrary measurement area of 3 to 10 ⁇ m square (vertical 3 to 10 ⁇ m, horizontal 3 to 10 ⁇ m) under the above-described conditions.
- region are each calculated
- the number of such measurement points varies depending on the type and setting of the measurement device used. For example, the product name “E-sweep” manufactured by Hitachi High-Tech Science Co., Ltd. is used as the measurement device. In this case, 65536 points (256 vertical points ⁇ 256 horizontal points) can be measured (measured at a resolution of 256 ⁇ 256 pixels) in a measurement area of 3 ⁇ m square.
- the measurement point P with the highest height from the surface of the transparent support substrate 1 is calculated
- a plane including the measurement point P and parallel to the surface of the transparent support substrate 1 is defined as a reference plane (horizontal plane), and the depth value from the reference plane (the height from the transparent support substrate 1 at the measurement point P is measured).
- the difference obtained by subtracting the height from the transparent support substrate 1 at each measurement point from the value) is obtained as the data of the unevenness depth.
- Such unevenness depth data can be obtained by automatically calculating with software or the like in the measuring device depending on the measuring device (for example, product name “E-sweep” manufactured by Hitachi High-Tech Science Co., Ltd.).
- the value obtained by such automatic calculation can be used as the data of the unevenness depth.
- the values that can be calculated by calculating the arithmetic mean and standard deviation thereof are the average value of the unevenness depth distribution and the standard deviation of the unevenness depth, respectively.
- Adopt as.
- the average pitch of the unevenness, the average value of the unevenness depth distribution, and the standard deviation of the unevenness depth are obtained through the measurement method as described above, regardless of the surface material on which the unevenness is formed. Can do.
- the light scattered and / or diffracted from such a concavo-convex pattern has a relatively broad wavelength band, not light of a single or narrow band wavelength, and the scattered light and / or diffracted light is directed. There is no sex and heads in all directions.
- the “irregular irregularity pattern” the Fourier transform image obtained by performing the two-dimensional fast Fourier transform processing on the irregularity analysis image obtained by analyzing the shape of the irregularity on the surface shows a circular or annular pattern.
- a quasi-periodic structure having a distribution of the pitches of the concaves and convexes is included although there is no directivity in the direction of the concaves and convexes.
- the transparent conductive material of a diffraction substrate or solar cell used in a surface light emitting device such as an organic EL device is used.
- a suitable substrate is preferable.
- any coating method such as a bar coating method, a spin coating method, a spray coating method, a dip coating method, a die coating method, and an ink jet method can be used.
- the bar coating method, the die coating method and the spin coating method can be used. preferable.
- the sol-gel material layer (uneven structure) comprising the island-like structure 54 of the first sol-gel material (uneven surface forming material) and the coating film 62 of the second sol-gel material on the substrate.
- Layer) 42 (see FIG. 4) is fired (step S7 in FIG. 1).
- Firing is preferably performed at a temperature of 200 to 1200 ° C. for about 5 minutes to 6 hours.
- the sol-gel material layer 42 is cured, and a sol-gel structure (diffraction grating) having a corrugated structure having a portion corresponding to the island-like structure 54 of the first sol-gel material as a convex portion can be obtained.
- the sol-gel material layer 42 becomes amorphous or crystalline, or a mixed state of amorphous and crystalline depending on the firing temperature and firing time.
- gelation may proceed by performing light irradiation instead of heating and baking the sol-gel material layer 42.
- the optical substrate 100 having the corrugated sol-gel material layer 42 is formed by forming the island-like structure 54 on the substrate 40 by microcontact printing as described above and subsequently forming the coating film 62 of the second sol-gel material. Is obtained.
- the optical substrate 100 is provided on the side of the photoelectric conversion surface of a solar cell by providing a light confinement effect inside the solar cell by being installed on a diffraction grating substrate for an organic EL element, a wire grid polarizer, an antireflection film, or the photoelectric conversion surface of the solar cell. It can be used as an optical element. Or you may transcribe
- the transferred resin pattern is a reverse pattern of the pattern on the substrate
- a mold as a replica of the substrate may be manufactured by further transferring the transferred reverse pattern to another resin.
- These molds can be electroformed with Ni or the like to form metal molds.
- optical parts such as a diffraction grating substrate for an organic EL element can be mass-produced more efficiently.
- the first sol-gel material and the second sol-gel material are used to form the island-like structure 54 and the coating film 62, respectively, but metal oxides can be used instead of these sol-gel materials. .
- ⁇ Method for producing organic EL element> An example of a manufacturing method for manufacturing an organic EL element using a substrate having a corrugated structure made of a sol-gel material as described above will be described with reference to FIG. First, in order to remove foreign substances and the like attached to a substrate on which a pattern composed of a sol-gel material layer is formed, washing is performed with a brush, and then organic substances are removed with an alkaline cleaning agent and an organic solvent. Next, as shown in FIG. 5, the transparent electrode 92 is laminated on the sol-gel material layer 42 of the substrate 40 so that the uneven structure formed on the surface of the sol-gel material layer 42 is maintained.
- the material of the transparent electrode 92 for example, indium oxide, zinc oxide, tin oxide, and indium tin oxide (ITO) that is a composite thereof, gold, platinum, silver, and copper are used. Among these, ITO is preferable from the viewpoints of transparency and conductivity.
- the thickness of the transparent electrode 92 is preferably in the range of 20 to 500 nm. If the thickness is less than the lower limit, the conductivity tends to be insufficient, and if it exceeds the upper limit, the transparency may be insufficient and the emitted EL light may not be sufficiently extracted to the outside.
- a known method such as a vapor deposition method, a sputtering method, or a spin coating method can be appropriately employed.
- the sputtering method is preferable from the viewpoint of improving adhesion, and after that, a photoresist is applied and exposed with an electrode mask pattern, and then etched with a developer to obtain a transparent electrode having a predetermined pattern.
- the substrate is exposed to a high temperature of about 300 ° C. during sputtering. It is desirable to clean the obtained transparent electrode with a brush, remove organic matter with an alkaline cleaner and an organic solvent, and then perform UV ozone treatment.
- the organic layer 94 shown in FIG. 5 is laminated on the transparent electrode 92.
- Such an organic layer 94 is not particularly limited as long as it can be used for the organic layer of the organic EL element, and a known organic layer can be appropriately used.
- Such an organic layer 94 may be a laminate of various organic thin films. For example, a laminate comprising a hole transport layer 95, a light emitting layer 96, and an electron transport layer 97 as shown in FIG. It may be.
- phthalocyanine derivatives As the material of the hole transport layer 95, phthalocyanine derivatives, naphthalocyanine derivatives, porphyrin derivatives, N, N′-bis (3-methylphenyl)-(1,1′-biphenyl) -4,4′-diamine ( Aromatic diamine compounds such as TPD) and 4,4′-bis [N- (naphthyl) -N-phenyl-amino] biphenyl ( ⁇ -NPD), oxazole, oxadiazole, triazole, imidazole, imidazolone, stilbene derivatives, Examples include pyrazoline derivatives, tetrahydroimidazole, polyarylalkanes, butadiene, 4,4 ′, 4 ′′ -tris (N- (3-methylphenyl) N-phenylamino) triphenylamine (m-MTDATA). It is not limited.
- the light emitting layer 96 is provided to recombine the holes injected from the transparent electrode 92 and the electrons injected from the metal electrode 98 to emit light.
- Materials that can be used for the light emitting layer 96 include anthracene, naphthalene, pyrene, tetracene, coronene, perylene, phthaloperylene, naphthaloperylene, diphenylbutadiene, tetraphenylbutadiene, coumarin, oxadiazole, bisbenzoxazoline, bisstyryl, cyclopentadiene, aluminum Organometallic complexes such as quinolinol complex (Alq3), tri- (p-terphenyl-4-yl) amine, 1-aryl-2,5-di (2-thienyl) pyrrole derivatives, pyran, quinacridone, rubrene, distyryl Benzene derivatives, distyrylarylene derivatives,
- the light emitting material selected from these compounds suitably.
- a material system that emits light from a spin multiplet for example, a phosphorescent material that emits phosphorescence, and a compound that includes a portion formed of these in a part of the molecule can be preferably used.
- the phosphorescent material preferably contains a heavy metal such as iridium. Even if the above-mentioned light emitting material is doped as a guest material in a host material having high carrier mobility, light can be emitted by utilizing dipole-dipole interaction (Felster mechanism) and electron exchange interaction (Dexter mechanism). good.
- the material for the electron transport layer 97 includes nitro-substituted fluorene derivatives, diphenylquinone derivatives, thiopyrandioxide derivatives, heterocyclic tetracarboxylic anhydrides such as naphthaleneperylene, carbodiimide, fluorenylidenemethane derivatives, anthraquinodimethane. And organometallic complexes such as anthrone derivatives, oxadiazole derivatives, aluminum quinolinol complexes (Alq3), and the like.
- a thiadiazole derivative in which an oxygen atom of the oxadiazole ring is substituted with a sulfur atom, or a quinoxaline derivative having a quinoxaline ring known as an electron withdrawing group can also be used as an electron transport material.
- a polymer material in which these materials are introduced into a polymer chain or these materials are used as a polymer main chain can also be used.
- the hole transport layer 95 or the electron transport layer 97 may also serve as the light emitting layer 96.
- the organic layer between the transparent electrode 92 and the metal electrode 98 is two layers.
- a metal fluoride such as lithium fluoride (LiF) or Li 2 O 3 or a metal oxide is used as an electron injection layer between the organic layer 94 and the metal electrode 98.
- a layer made of a highly active alkaline earth metal such as Ca, Ba, or Cs, an organic insulating material, or the like may be provided.
- a triazole derivative, oxadiazole derivative, imidazole derivative, polyarylalkane derivative as a hole injection layer between the organic layer 94 and the transparent electrode 92, Pyrazoline derivatives and pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, oxazole derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, stilbene derivatives, silazane derivatives, aniline copolymers, or conductive polymer oligomers
- a layer made of a thiophene oligomer or the like may be provided.
- the organic layer 94 is a stacked body including the hole transport layer 95, the light emitting layer 96, and the electron transport layer 97
- the thickness of the hole transport layer 95, the light emitting layer 96, and the electron transport layer 97 is 1 respectively.
- a range of ⁇ 200 nm, a range of 5 to 100 nm, and a range of 5 to 200 nm are preferable.
- a method for laminating the organic layer 94 a known method such as an evaporation method, a sputtering method, a spin coating method, or a die coating method can be appropriately employed.
- a metal electrode 98 is then laminated on the organic layer 94 as shown in FIG.
- a material of the metal electrode 98 a substance having a small work function can be used as appropriate, and is not particularly limited, and examples thereof include aluminum, MgAg, MgIn, and AlLi.
- the thickness of the metal electrode 98 is preferably in the range of 50 to 500 nm. If the thickness is less than the lower limit, the conductivity tends to decrease, and if the thickness exceeds the upper limit, it may be difficult to repair when a short circuit occurs between the electrodes.
- the metal electrode 98 can be laminated by employing a known method such as vapor deposition or sputtering. Thus, an organic EL element 200 having a structure as shown in FIG. 5 is obtained.
- the sol-gel material layer (uneven structure layer) 42 composed of the first sol-gel material island structure 54 and the second sol-gel material coating 62 has a portion corresponding to the first sol-gel material island structure 54.
- the corrugated structure (uneven structure) which has as a convex part can be formed.
- the concavo-convex pattern of the optical substrate manufactured according to the method of the present invention is formed from a metal oxide such as a sol-gel material
- the concavo-convex pattern is formed from a curable resin in various points as described below. This is advantageous compared to a substrate on which a pattern is formed.
- the organic EL element obtained by the method of the present invention is superior to the case of using a curable resin substrate in terms of the mechanical strength of the substrate having an uneven pattern.
- a substrate formed from a metal oxide such as a sol-gel material manufactured according to the method of the present invention is excellent in chemical resistance. Therefore, it is relatively corrosion resistant to the alkaline liquid and organic solvent used in the cleaning process of the substrate and the transparent electrode, and various cleaning liquids can be used. Further, as described above, an alkaline developer may be used during patterning of the transparent substrate, and the developer is also resistant to corrosion. This is advantageous compared to a curable resin substrate having a relatively low resistance to an alkaline solution.
- a substrate formed from a metal oxide such as a sol-gel material manufactured according to the method of the present invention is excellent in heat resistance. For this reason, it can endure the high temperature atmosphere of the sputtering process in the transparent electrode manufacturing process of an organic EL element. Furthermore, a substrate formed from a metal oxide such as a sol-gel material manufactured according to the method of the present invention is superior in UV resistance and weather resistance compared to a curable resin substrate. For this reason, it has tolerance also to the UV ozone cleaning process after transparent electrode formation.
- the organic EL element manufactured according to the embodiment When the organic EL element manufactured according to the embodiment is used outdoors, deterioration due to sunlight can be suppressed as compared with the case where an organic EL element using a substrate having a concavo-convex pattern formed on a curable resin is used. Further, the cured resin as described above may deteriorate when left for a long period of time due to heat generated during light emission, and may cause yellowing or generation of gas. Although difficult to use, deterioration is suppressed in an organic EL element including a substrate manufactured using a metal oxide such as a sol-gel material.
- the manufacturing method of the member which has an uneven structure like the optical substrate which has an uneven pattern of this invention is not limited to the said embodiment and Example, A patent Modifications can be made as appropriate within the scope of the technical idea described in the claims.
- the method for producing a member having a concavo-convex structure according to the present invention is not limited to the production of an optical substrate, and can be used for various applications.
- optical elements such as microlens arrays, prism arrays, and optical waveguides, and optical elements such as lenses.
- the uneven pattern which the member by the manufacturing method of the present invention has is not limited to the irregular uneven pattern obtained by the BCP method or the BKL method, and may have a regular uneven pattern, such as a line pattern or a dot pattern. You may have.
- the uneven structure is not limited to the corrugated structure, but may be a rectangular structure, a V-shaped structure, a random structure, or the like.
- the method for producing a member having a concavo-convex structure according to the present invention can produce a member having a concavo-convex structure with high throughput while accurately and reliably forming a fine pattern.
- the concavo-convex pattern of the member having the concavo-convex structure manufactured by the manufacturing method of the present invention is excellent in heat resistance, weather resistance and corrosion resistance, and is resistant to the manufacturing process of the element incorporating the member having the concavo-convex structure. The life of the element can be extended.
- the member having a concavo-convex structure obtained by the production method of the present invention is extremely effective for various devices such as an organic EL element and a solar cell, and the member having the concavo-convex structure thus obtained is used as an optical substrate.
- the manufacturing method of this invention can be used not only for manufacture of an optical substrate but for various uses.
- the manufacture of concentrating films and antireflection films for solar cells and various displays the manufacture of semiconductor chips, the manufacture of tissue paper (eg drums used for web compression), and foods such as noodles Also used in manufacturing, biochips with fine channels, biochips for genome and proteome analysis, cell culture sheets (nanopyra sheets used as cell culture containers), microchips for cell sorting, etc. be able to.
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Abstract
Description
凹凸パターンを有するスタンプを用意する工程と、
前記スタンプの凸部に、凹凸形成材料を塗布する工程と、
前記凹凸形成材料が塗布された前記スタンプを基板に接触させることにより、前記基板上に前記凹凸形成材料を転写する工程と、
前記転写された凹凸形成材料を覆うように、前記基板上に凹凸被覆材料を塗布する工程とを有する凹凸構造を有する部材の製造方法が提供される。
実施形態の光学基板の製造方法において、マイクロコンタクトプリントに用いるスタンプは、弾性変形可能な材料から構成され、表面に凹凸の転写パターンを有する。スタンプは、後述のスタンプ製造方法によって作製することができる。弾性変形可能な材料としてゴム系材料が好ましく、特に、シリコーンゴム、またはシリコーンゴムと他の材料との混合物もしくは共重合体が好ましい。シリコーンゴムとしては、例えば、ポリジメチルシロキサン(PDMS)のようなポリオルガノシロキサン、架橋型ポリオルガノシロキサン、ポリオルガノシロキサン/ポリカーボネート共重合体、ポリオルガノシロキサン/ポリフェニレン共重合体、ポリオルガノシロキサン/ポリスチレン共重合体、ポリトリメチルシリルプロピン、ポリ4メチルペンテンなどが用いられる。シリコーンゴムは、他の樹脂材料と比べて安価で、耐熱性に優れ、熱伝導性が高く、弾性があり、高温条件下でも変形しにくいことから、高温条件下で行う凹凸パターン転写プロセスに好適である。
測定方式:カンチレバー断続的接触方式
カンチレバーの材質:シリコン
カンチレバーのレバー幅:40μm
カンチレバーのチップ先端の直径:10nm
により、表面の凹凸を解析して凹凸解析画像を測定した後、かかる凹凸解析画像中における、任意の隣り合う凸部同士又は隣り合う凹部同士の間隔を100点以上測定し、その算術平均を求めることにより算出できる。
実施形態の光学基板の製造方法において、マイクロコンタクトプリント法により基板にパターンを転写するための凹凸形成材料として用いられる第1ゾルゲル材料を調製する(図1の工程S2)。例えば、基板上に、シリカをゾルゲル法で合成する場合は、金属アルコキシド(シリカ前駆体)のゾルゲル材料を第1ゾルゲル材料(凹凸形成材料)として調製する。シリカの前駆体として、テトラメトキシシラン(TMOS)、テトラエトキシシラン(TEOS)、テトラ‐i‐プロポキシシラン、テトラ‐n‐プロポキシシラン、テトラ‐i‐ブトキシシラン、テトラ‐n‐ブトキシシラン、テトラ‐sec‐ブトキシシラン、テトラ‐t‐ブトキシシラン等のテトラアルコキシドモノマーや、メチルトリメトキシシラン、エチルトリメトキシシラン、プロピルトリメトキシシラン、イソプロピルトリメトキシシラン、フェニルトリメトキシシラン、メチルトリエトキシシラン(MTES)、エチルトリエトキシシラン、プロピルトリエトキシシラン、イソプロピルトリエトキシシラン、フェニルトリエトキシシラン、メチルトリプロポキシシラン、エチルトリプロポキシシラン、プロピルトリプロポキシシラン、イソプロピルトリプロポキシシラン、フェニルトリプロポキシシラン、メチルトリイソプロポキシシラン、エチルトリイソプロポキシシラン、プロピルトリイソプロポキシシラン、イソプロピルトリイソプロポキシシラン、フェニルトリイソプロポキシシラン等のトリアルコキシドモノマー、ジメチルジメトキシシラン、ジメチルジエトキシシラン、ジメチルジプロポキシシラン、ジメチルジイソプロポキシシラン、ジメチルジ-n-ブトキシシラン、ジメチルジ-i-ブトキシシラン、ジメチルジ-sec-ブトキシシラン、ジメチルジ-t-ブトキシシラン、ジエチルジメトキシシラン、ジエチルジエトキシシラン、ジエチルジプロポキシシラン、ジエチルジイソプロポキシシラン、ジエチルジ-n-ブトキシシラン、ジエチルジ-i-ブトキシシラン、ジエチルジ-sec-ブトキシシラン、ジプロピルジ-t-ブトキシシラン、ジプロピルジメトキシシラン、ジプロピルジエトキシシラン、ジプロピルジプロポキシシラン、ジプロピルジイソプロポキシシラン、ジプロピルジ-n-ブトキシシラン、ジプロピルジ-i-ブトキシシラン、ジプロピルジ-sec-ブトキシシラン、ジプロピルジ-t-ブトキシシラン、ジイソプロピルジメトキシシラン、ジイソプロピルジエトキシシラン、ジイソプロピルジプロポキシシラン、ジイソプロピルジイソプロポキシシラン、ジイソプロピルジ-n-ブトキシシラン、ジイソプロピルジ-i-ブトキシシラン、ジイソプロピルジ-sec-ブトキシシラン、ジイソプロピルジ-t-ブトキシシラン、ジフェニルジメトキシシラン、ジフェニルジエトキシシラン、ジフェニルジプロポキシシラン、ジフェニルジイソプロポキシシラン、ジフェニルジ-n-ブトキシシラン、ジフェニルジ-i-ブトキシシラン、ジフェニルジ-sec-ブトキシシラン、ジフェニルジ-t-ブトキシシラン等のジアルコキシドモノマーや、これらモノマーを少量重合したポリマー、前記材料の一部に官能基やポリマーを導入したことを特徴とする複合材料などの金属アルコキシドが挙げられる。さらに、金属アセチルアセトネート、金属カルボキシレート、オキシ塩化物、塩化物や、それらの混合物などが挙げられるが、これらに限定されない。また、金属種としては、Si以外にTi、Sn、Al、Zn、Zr、Inなどや、これらの混合物などが挙げられるが、これらに限定されない。上記酸化金属の前駆体を適宜混合したものを用いることもできる。
上記のように調製した第1ゾルゲル材料(凹凸形成材料)をマイクロコンタクトプリント用スタンプの凸部に塗布する(図1の工程S3)。例えば、図3(A)のように凹凸パターン83aを有するスタンプ83の凸部83aaに、第1ゾルゲル材料(凹凸形成材料)の塗膜52を形成する。第1ゾルゲル材料は、スタンプ83の凸部83aaの表面(被転写物(ここでは基板40)と対向する面)のみに塗布することが望ましいが、塗布方法によっては、凸部83aaの側部、すなわち凹部83abに回り込むこともあり得る。この場合でも、後述の転写工程において、スタンプ83の凸部83aaのパターンが基板上に反映されていれば、第1ゾルゲル材料がスタンプ83の凹部83abに付着していても構わない。塗布方法として、バーコート法、スピンコート法、スプレーコート法、ディップコート法、ダイコート法、インクジェット法などの任意の塗布方法を使用することができるが、比較的大面積のスタンプにゾルゲル材料を均一に塗布可能であること、第1ゾルゲル材料が硬化(ゲル化)する前に素早く塗布を完了させることができることからすれば、バーコート法、ダイコート法及びスピンコート法が好ましい。あるいは、スタンプをロール状に成型し、ロール状のスタンプを容器中に浅く充填したゾルゲル材料に浸漬して回転させることにより、スタンプの凸部にゾルゲル材料を塗布してもよい。ロール状のスタンプは、例えば、スタンプを金属などの硬質なロールに巻き付けることで作製することができる。スタンプの凸部に塗布する第1ゾルゲル材料の塗膜の膜厚は300~10000nmが好ましい。第1ゾルゲル材料の塗膜の膜厚は、例えば第1ゾルゲル材料の粘度等によって調製することができる。また、第1ゾルゲル材料の塗膜表面に疎水化処理を行ってもよい。疎水化処理の方法は知られている方法を用いればよく、例えば、シリカ表面であれば、ジメチルジクロルシラン、トリメチルアルコキシシラン等で疎水化処理することもできるし、ヘキサメチルジシラザンなどのトリメチルシリル化剤とシリコーンオイルで疎水化処理する方法を用いてもよいし、超臨界二酸化炭素を用いた金属酸化物粉末の表面処理方法を用いてもよい。
塗布工程後、マイクロコンタクトプリント法によって、スタンプ83のパターンを基板40に転写する(図1の工程S4)。例えば、図3(A)に示すように、第1ゾルゲル材料の塗膜52を形成したスタンプ83の直下に基板40を配置し、次いで図3(B)に示すように、スタンプ83の凸部83aaに形成された第1ゾルゲル材料の塗膜52を基板40に接触させる。基板40として、ガラスや石英、シリコン基板等の無機材料からなる基板やポリエチレンテレフタレート(PET)、ポリエチレンテレナフタレート(PEN)、ポリカーボネート(PC)、シクロオレフィンポリマー(COP)、ポリメチルメタクリレート(PMMA)、ポリスチレン(PS)、ポリイミド(PI)、ポリアリレート等の樹脂基板を用い得るが、ゾルゲル材料との接着力が大きいことから、ガラス製の基板であることが望ましい。ゾルゲル材料と基板40の接着力が高いことにより、基板40にスタンプ83のパターンを正確に転写することができる。また、基板40は、O3処理などによって表面を親水処理したものを使用してもよい。基板40の表面を親水処理をすることにより、基板40とゾルゲル材料の接着力をさらに大きくすることができる。基板40は透明(光透過性)でも不透明でもよい。この基板40から得られた凹凸パターン基板を後述する有機EL素子の製造に用いるのであれば、基板40は耐熱性、UV光等に対する耐光性を備える基板が望ましい。この観点から、基板40として、ガラスや石英、シリコン基板等の無機材料からなる基板がより好ましい。基板40上には密着性を向上させるために、表面処理や易接着層を設けるなどをしてもよいし、水分や酸素等の気体の浸入を防ぐ目的で、ガスバリア層を設けるなどしてもよい。
実施形態の光学基板の製造方法において、第1ゾルゲル材料の島状構造が形成された基板上に塗布する凹凸被覆材料として使用される第2ゾルゲル材料を調製する(図1の工程S5)。例えば、基板上に、シリカをゾルゲル法で合成する場合は、第1ゾルゲル材料と同様に、第2ゾルゲル材料(凹凸被覆材料)として金属アルコキシド(シリカ前駆体)のゾルゲル材料を調製する。シリカの前駆体として、第1ゾルゲル材料と同様に、テトラメトキシシラン(TMOS)、テトラエトキシシラン(TEOS)、テトラ‐i‐プロポキシシラン、テトラ‐n‐プロポキシシラン、テトラ‐i‐ブトキシシラン、テトラ‐n‐ブトキシシラン、テトラ‐sec‐ブトキシシラン、テトラ‐t‐ブトキシシラン等のテトラアルコキシドモノマーや、メチルトリメトキシシラン、エチルトリメトキシシラン、プロピルトリメトキシシラン、イソプロピルトリメトキシシラン、フェニルトリメトキシシラン、メチルトリエトキシシラン(MTES)、エチルトリエトキシシラン、プロピルトリエトキシシラン、イソプロピルトリエトキシシラン、フェニルトリエトキシシラン、メチルトリプロポキシシラン、エチルトリプロポキシシラン、プロピルトリプロポキシシラン、イソプロピルトリプロポキシシラン、フェニルトリプロポキシシラン、メチルトリイソプロポキシシラン、エチルトリイソプロポキシシラン、プロピルトリイソプロポキシシラン、イソプロピルトリイソプロポキシシラン、フェニルトリイソプロポキシシラン等のトリアルコキシドモノマー、ジメチルジメトキシシラン、ジメチルジエトキシシラン、ジメチルジプロポキシシラン、ジメチルジイソプロポキシシラン、ジメチルジ-n-ブトキシシラン、ジメチルジ-i-ブトキシシラン、ジメチルジ-sec-ブトキシシラン、ジメチルジ-t-ブトキシシラン、ジエチルジメトキシシラン、ジエチルジエトキシシラン、ジエチルジプロポキシシラン、ジエチルジイソプロポキシシラン、ジエチルジ-n-ブトキシシラン、ジエチルジ-i-ブトキシシラン、ジエチルジ-sec-ブトキシシラン、ジプロピルジ-t-ブトキシシラン、ジプロピルジメトキシシラン、ジプロピルジエトキシシラン、ジプロピルジプロポキシシラン、ジプロピルジイソプロポキシシラン、ジプロピルジ-n-ブトキシシラン、ジプロピルジ-i-ブトキシシラン、ジプロピルジ-sec-ブトキシシラン、ジプロピルジ-t-ブトキシシラン、ジイソプロピルジメトキシシラン、ジイソプロピルジエトキシシラン、ジイソプロピルジプロポキシシラン、ジイソプロピルジイソプロポキシシラン、ジイソプロピルジ-n-ブトキシシラン、ジイソプロピルジ-i-ブトキシシラン、ジイソプロピルジ-sec-ブトキシシラン、ジイソプロピルジ-t-ブトキシシラン、ジフェニルジメトキシシラン、ジフェニルジエトキシシラン、ジフェニルジプロポキシシラン、ジフェニルジイソプロポキシシラン、ジフェニルジ-n-ブトキシシラン、ジフェニルジ-i-ブトキシシラン、ジフェニルジ-sec-ブトキシシラン、ジフェニルジ-t-ブトキシシラン等のジアルコキシドモノマーや、これらモノマーを少量重合したポリマー、前記材料の一部に官能基やポリマーを導入したことを特徴とする複合材料などの金属アルコキシドが挙げられる。さらに、金属アセチルアセトネート、金属カルボキシレート、オキシ塩化物、塩化物や、それらの混合物などが挙げられるが、これらに限定されない。また、金属種としては、Si以外にTi、Sn、Al、Zn、Zr、Inなどや、これらの混合物などが挙げられるが、これらに限定されない。上記酸化金属の前駆体を適宜混合したものを用いることもできる。
-Si(R1)(R2)-N(R3)-
式中、R1、R2、R3は、各々水素原子、アルキル基、アルケニル基、シクロアルキル基、アリール基、アルキルシリル基、アルキルアミノ基またはアルコキシ基を表す。
上記のように調製した第2ゾルゲル材料(凹凸被覆材料)を、前述の第1ゾルゲル材料の島状構造54を形成した基板40上に塗布する(図1の工程S6)。これにより、図4に示すように、第1ゾルゲル材料の島状構造54を覆うように第2ゾルゲル材料(凹凸被覆材料)の塗膜62が形成される。このとき、島状構造54を覆わない第2ゾルゲル材料(一部の第2ゾルゲル材料)は基板40(基板の露出部分)を覆い、基板40に接している。第1ゾルゲル材料の島状構造54及び第2ゾルゲル材料の塗膜62よりなるゾルゲル材料層(凹凸構造層)42は、第1ゾルゲル材料の島状構造54に対応する部分を凸部として有する波形構造(凹凸構造)を形成し得る。形成した凹凸パターンがなめらかな波形構造であることにより、作製した光学基板を有機EL素子の製造に用いて、その凹凸の表面に有機層を蒸着させたときに、有機層の一部の厚みが極端に薄くなることを十分に防止でき、有機層を十分に均一な膜厚で積層できると考えられる。その結果、電極間距離を十分に均一なものとすることができ、電界が集中することを十分に抑制できる。また、有機EL素子において、凹凸構造の波形の傾斜部における電位分布の勾配が緩やかになるため、リーク電流の発生をより十分に抑制することができるものと考えられる。
基板に第2ゾルゲル材料(凹凸被覆材料)を塗布した後、基板上の第1ゾルゲル材料(凹凸形成材料)の島状構造54及び第2ゾルゲル材料の塗膜62からなるゾルゲル材料層(凹凸構造層)42(図4参照)を焼成する(図1の工程S7)。焼成によりゾルゲル材料層42に含まれている水酸基などが脱離して塗膜がより強固となる。焼成は、200~1200℃の温度で、5分~6時間程度行うのが良い。こうしてゾルゲル材料層42が硬化して、第1ゾルゲル材料の島状構造54に対応する部分を凸部として備える波形構造を有するゾルゲル構造体(回折格子)を得ることができる。この時、ゾルゲル材料層42は、焼成温度、焼成時間に応じて非晶質または結晶質、または非晶質と結晶質の混合状態となる。第1ゾルゲル材料及び/または第2ゾルゲル材料として光硬化性ゾルゲル材料を使用した場合、ゾルゲル材料層42を加熱・焼成する代わりに光照射を行うことでゲル化(硬化)を進めてもよい。
上記のようにしてゾルゲル材料からなる波形構造が形成された基板を用いて有機EL素子を製造する製造方法の一例について、図5を参照しながら説明する。先ず、ゾルゲル材料層からなるパターンが形成された基板に付着している異物などを除去するために、ブラシで洗浄し、次いで、アルカリ性洗浄剤および有機溶剤で有機物等を除去する。次いで、図5に示すように、基板40のゾルゲル材料層42上に、透明電極92を、ゾルゲル材料層42の表面に形成されている凹凸構造が維持されるようにして積層する。透明電極92の材料としては、例えば、酸化インジウム、酸化亜鉛、酸化スズ、及びそれらの複合体であるインジウム・スズ・オキサイド(ITO)、金、白金、銀、銅が用いられる。これらの中でも、透明性と導電性の観点から、ITOが好ましい。透明電極92の厚みは20~500nmの範囲であることが好ましい。厚みが前記下限未満では、導電性が不十分となり易く、前記上限を超えると、透明性が不十分となり発光したEL光を十分に外部に取り出せなくなる可能性がある。透明電極92を積層する方法としては、蒸着法、スパッタ法、スピンコート法等の公知の方法を適宜採用することができる。これらの方法の中でも、密着性を上げるという観点から、スパッタ法が好ましく、その後、フォトレジストを塗布して電極用マスクパターンで露光した後、現像液でエッチングして所定のパターンの透明電極を得る。なお、スパッタ時には基板が300℃程度の高温に曝されることになる。得られた透明電極をブラシで洗浄し、アルカリ性洗浄剤および有機溶剤で有機物等を除去した後、UVオゾン処理することが望ましい。
40 基板
42 ゾルゲル材料層
52 第1ゾルゲル材料の塗膜、62 第2ゾルゲル材料の塗膜
83 スタンプ
92 透明電極、94 有機層、95 正孔輸送層
96 発光層、97 電子輸送層、98 金属電極
200 有機EL素子
Claims (19)
- 凹凸構造を有する部材の製造方法であって、
凹凸パターンを有するスタンプを用意する工程と、
前記スタンプの凸部に、凹凸形成材料を塗布する工程と、
前記凹凸形成材料が塗布された前記スタンプを基板に接触させることにより、前記基板上に前記凹凸形成材料を転写する工程と、
前記転写された前記凹凸形成材料を覆うように、前記基板上に凹凸被覆材料を塗布する工程とを有する凹凸構造を有する部材の製造方法。 - 前記基板上に前記凹凸被覆材料を塗布することにより、前記基板上に前記凹凸形成材料及び前記凹凸被覆材料からなる凹凸構造層を形成する請求項1に記載の凹凸構造を有する部材の製造方法。
- 前記凹凸形成材料がゾルゲル材料である請求項1または2に記載の凹凸構造を有する部材の製造方法。
- 前記凹凸被覆材料がゾルゲル材料である請求項1~3のいずれか一項に記載の凹凸構造を有する部材の製造方法。
- 前記凹凸形成材料を前記基板上に島状に転写する請求項1~4のいずれか一項に記載の凹凸構造を有する部材の製造方法。
- 前記凹凸被覆材料の一部が前記基板と接触するように前記凹凸被覆材料を塗布する請求項5に記載の凹凸構造を有する部材の製造方法。
- 前記凹凸構造を有する部材が光学基板である請求項1~6のいずれか一項に記載の凹凸構造を有する部材の製造方法。
- 前記スタンプがシリコーンゴムから形成される請求項1~7のいずれか一項に記載の凹凸構造を有する部材の製造方法。
- 前記凹凸形成材料の粘度が前記凹凸被覆材料の粘度より高い請求項1~8のいずれか一項に記載の凹凸構造を有する部材の製造方法。
- 前記基板上に前記凹凸形成材料を転写する工程において、前記凹凸形成材料を加熱する請求項1~9のいずれか一項に記載の凹凸構造を有する部材の製造方法。
- 前記凹凸形成材料の加熱温度が150~200℃である請求項10に記載の凹凸構造を有する部材の製造方法。
- 転写された前記凹凸形成材料の高さを前記凹凸形成材料の固形分濃度によって調整する請求項1~11のいずれか一項に記載の凹凸構造を有する部材の製造方法。
- 塗布された前記凹凸被覆材料の膜厚を前記凹凸被覆材料の固形分濃度によって調整する請求項1~12のいずれか一項に記載の凹凸構造を有する部材の製造方法。
- 請求項1~13のいずれか一項に記載の凹凸構造を有する部材の製造方法によって得られた、前記基板上に前記凹凸構造を有する部材。
- 請求項14に記載の凹凸構造を有する部材を用いて有機EL素子を製造する有機EL素子の製造方法。
- 凹凸構造を有する光学部材であって、
基板と、
前記基板とは異なる材料から形成され且つ前記基板の表面に互いに孤立した複数の凸部から構成された島状構造と、
前記島状構造と前記凸部間に露出する基板表面とを覆う被覆部とを備える光学部材。 - 前記凸部と前記被覆部は、いずれもゾルゲル材料から形成されている請求項16に記載の光学部材。
- 前記凸部と前記被覆部が異なる材料から形成されている請求項16に記載の光学部材。
- 前記光学部材が有機EL用の光取り出し基板である請求項16~18のいずれか一項に記載の光学部材。
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- 2014-02-26 JP JP2015504255A patent/JP6101784B2/ja not_active Expired - Fee Related
- 2014-02-26 CN CN201480012482.0A patent/CN105027259A/zh active Pending
- 2014-02-26 TW TW103106423A patent/TW201501910A/zh unknown
- 2014-02-26 CA CA2901335A patent/CA2901335A1/en not_active Abandoned
- 2014-02-26 KR KR1020157022125A patent/KR20150106963A/ko active Search and Examination
- 2014-02-26 WO PCT/JP2014/054599 patent/WO2014136624A1/ja active Application Filing
- 2014-02-26 AU AU2014227157A patent/AU2014227157B2/en not_active Ceased
- 2014-02-26 EP EP14759483.2A patent/EP2966669A4/en not_active Withdrawn
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2015
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JP2016109932A (ja) * | 2014-12-08 | 2016-06-20 | 三菱電機株式会社 | 表示ユニット、映像表示装置及び表示ユニットの製造方法 |
KR20190034592A (ko) * | 2016-07-27 | 2019-04-02 | 코닌클리케 필립스 엔.브이. | 폴리오르가노실록산-기반 스탬프 제조 방법, 폴리오르가노실록산-기반 스탬프, 인쇄 공정을 위한 이의 용도, 및 이를 사용하는 임프린팅 방법 |
KR102380203B1 (ko) | 2016-07-27 | 2022-03-29 | 코닌클리케 필립스 엔.브이. | 폴리오르가노실록산-기반 스탬프 제조 방법, 폴리오르가노실록산-기반 스탬프, 인쇄 공정을 위한 이의 용도, 및 이를 사용하는 임프린팅 방법 |
Also Published As
Publication number | Publication date |
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AU2014227157B2 (en) | 2016-09-22 |
EP2966669A4 (en) | 2016-11-09 |
CA2901335A1 (en) | 2014-09-12 |
AU2014227157A1 (en) | 2015-09-17 |
KR20150106963A (ko) | 2015-09-22 |
JPWO2014136624A1 (ja) | 2017-02-09 |
JP6101784B2 (ja) | 2017-03-22 |
CN105027259A (zh) | 2015-11-04 |
US20150362635A1 (en) | 2015-12-17 |
EP2966669A1 (en) | 2016-01-13 |
TW201501910A (zh) | 2015-01-16 |
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