WO2017217201A1 - 透明導電部材、及び、有機エレクトロルミネッセンス素子 - Google Patents
透明導電部材、及び、有機エレクトロルミネッセンス素子 Download PDFInfo
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- WO2017217201A1 WO2017217201A1 PCT/JP2017/019402 JP2017019402W WO2017217201A1 WO 2017217201 A1 WO2017217201 A1 WO 2017217201A1 JP 2017019402 W JP2017019402 W JP 2017019402W WO 2017217201 A1 WO2017217201 A1 WO 2017217201A1
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- 229910001494 silver tetrafluoroborate Inorganic materials 0.000 description 1
- RHUVFRWZKMEWNS-UHFFFAOYSA-M silver thiocyanate Chemical compound [Ag+].[S-]C#N RHUVFRWZKMEWNS-UHFFFAOYSA-M 0.000 description 1
- LMEWRZSPCQHBOB-UHFFFAOYSA-M silver;2-hydroxypropanoate Chemical compound [Ag+].CC(O)C([O-])=O LMEWRZSPCQHBOB-UHFFFAOYSA-M 0.000 description 1
- DOQQTKLDEQSKIE-UHFFFAOYSA-N silver;isocyanate Chemical compound [Ag+].[N-]=C=O DOQQTKLDEQSKIE-UHFFFAOYSA-N 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005477 sputtering target Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Chemical group 0.000 description 1
- YRGLXIVYESZPLQ-UHFFFAOYSA-I tantalum pentafluoride Chemical compound F[Ta](F)(F)(F)F YRGLXIVYESZPLQ-UHFFFAOYSA-I 0.000 description 1
- 229940116411 terpineol Drugs 0.000 description 1
- YBRBMKDOPFTVDT-UHFFFAOYSA-N tert-butylamine Chemical compound CC(C)(C)N YBRBMKDOPFTVDT-UHFFFAOYSA-N 0.000 description 1
- XBXCNNQPRYLIDE-UHFFFAOYSA-N tert-butylcarbamic acid Chemical compound CC(C)(C)NC(O)=O XBXCNNQPRYLIDE-UHFFFAOYSA-N 0.000 description 1
- GXBLITCOLKGJDG-UHFFFAOYSA-N tetradec-13-en-1-ol Chemical compound OCCCCCCCCCCCCC=C GXBLITCOLKGJDG-UHFFFAOYSA-N 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- 238000002230 thermal chemical vapour deposition Methods 0.000 description 1
- 238000001029 thermal curing Methods 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 125000000101 thioether group Chemical group 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- CRDAMVZIKSXKFV-UHFFFAOYSA-N trans-Farnesol Natural products CC(C)=CCCC(C)=CCCC(C)=CCO CRDAMVZIKSXKFV-UHFFFAOYSA-N 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- 229910001930 tungsten oxide Inorganic materials 0.000 description 1
- KJIOQYGWTQBHNH-UHFFFAOYSA-N undecanol Chemical compound CCCCCCCCCCCO KJIOQYGWTQBHNH-UHFFFAOYSA-N 0.000 description 1
- 125000004417 unsaturated alkyl group Chemical group 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
- 229920006163 vinyl copolymer Polymers 0.000 description 1
- KAKZBPTYRLMSJV-UHFFFAOYSA-N vinyl-ethylene Natural products C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 1
- 239000004034 viscosity adjusting agent Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
- YVTHLONGBIQYBO-UHFFFAOYSA-N zinc indium(3+) oxygen(2-) Chemical compound [O--].[Zn++].[In+3] YVTHLONGBIQYBO-UHFFFAOYSA-N 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/26—Light sources with substantially two-dimensional radiating surfaces characterised by the composition or arrangement of the conductive material used as an electrode
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/26—Light sources with substantially two-dimensional radiating surfaces characterised by the composition or arrangement of the conductive material used as an electrode
- H05B33/28—Light sources with substantially two-dimensional radiating surfaces characterised by the composition or arrangement of the conductive material used as an electrode of translucent electrodes
Definitions
- the present invention relates to a transparent conductive member provided with a light scattering layer, and an organic electroluminescence element provided with the transparent conductive member.
- a transparent conductive member including a conductive layer formed using a conductive substance on a resin film is a thin material such as an organic electroluminescence (EL) element used in a display or a lighting panel, a solar cell, or electronic paper.
- EL organic electroluminescence
- a large-area electronic device, for example, an organic EL element for illumination, a solar cell for power generation, and the like require high light emission efficiency or power generation efficiency, and thus a low-resistance transparent conductive member is desired.
- the low-resistance transparent conductive member for example, a fine metal pattern formed by printing a fine wire pattern using a metal ink composition containing metal particles and a solvent for application to an inkjet method, and then firing the fine wire pattern has been proposed (see, for example, Patent Document 1 and Patent Document 2).
- a configuration in which a light scattering layer composed of light scattering particles and a binder is provided between a base material and a conductive layer has been proposed ( For example, see Patent Document 3). In this configuration, by having the light scattering layer, reflection at the interface between the conductive layer and the substrate is reduced, and light extraction efficiency is improved.
- a metal ink composition pattern is formed on the light scattering layer composed of light scattering particles and a binder using the above-described metal ink composition, and the metal ink composition pattern is baked to form a fine metal wire.
- the metal particles in the pattern are also scattered along with the scattering due to the evaporation of the solvent heated rapidly during firing, resulting in irregularities, disconnection, and disappearance (ablation) defects on the surface of the fine metal wires. Therefore, when a metal fine wire is formed on a conventional light scattering layer, a pattern defect of the metal fine wire occurs, so that sufficient reliability cannot be obtained in a transparent conductive member or an organic EL element.
- the present invention provides a transparent conductive member capable of improving light extraction efficiency and reliability, and an organic EL element capable of improving light emission efficiency and reliability.
- the transparent conductive member of the present invention is formed by covering a resin base, a light scattering layer including particles and a binder formed on the resin base, a metal fine wire formed on the light scattering layer, and the metal thin wire A transparent conductive film.
- the light scattering layer includes 80% or more of spherical particles having an aspect ratio of 2 or less as particles, and the thickness of the light scattering layer is larger than the average particle diameter of the particles.
- the particle abundance ratio in the region on the resin substrate side is larger than the particle abundance ratio in the region on the transparent conductive film side from the center in the thickness direction.
- the organic electroluminescent element of this invention is equipped with a light emission unit and a 2nd electrode on the said transparent conductive member.
- the present invention it is possible to provide a transparent conductive member capable of improving light extraction efficiency and reliability, and an organic EL element capable of improving light emission efficiency and reliability.
- a transparent conductive member 10 shown in FIG. 1 includes a resin base material 11, a light scattering layer 15 provided on the resin base material 11, and a conductive layer 12 provided on the light scattering layer 15.
- the light scattering layer 15 includes particles 16 and a binder 17.
- the conductive layer 12 includes a fine metal wire 13 formed on the light scattering layer 15 and a transparent conductive film 14 provided so as to cover the fine metal wire 13.
- the transparent conductive member 10 has a total light transmittance of preferably 70% or more, and more preferably 80% or more.
- the total light transmittance can be measured according to a known method using a spectrophotometer or the like. When the total light transmittance is low, it becomes difficult for light to go out of the device, and the luminance is lowered.
- the electrical resistance value of the conductive layer of the transparent conductive member 10 is such that the surface specific resistance is 100 ⁇ / sq. For use in a large-area organic electronic device. Or less, preferably 10 ⁇ / sq. The following is more preferable.
- the surface specific resistance can be measured, for example, according to JIS K6911, ASTM D257, etc., and can be easily measured using a commercially available surface resistivity meter.
- the particles 16 included in the light scattering layer 15 include 80% or more of spherical particles having an aspect ratio of 2 or less.
- the thickness of the light scattering layer 15 is larger than the particle diameter of the particles 16.
- the particles 16 include spherical particles having an aspect ratio of 2 or less as 80% or more, and the thickness of the light scattering layer 15 is larger than the particle diameter of the particles 16. It becomes easy to be unevenly distributed in the area
- a means for unevenly distributing the particles 16 in the region on the resin base material 11 side for example, a means for diluting the liquid concentration from the normal application concentration and applying it thickly by the diluted amount can be used. By doing so, it is possible to adjust the time from immediately after application to the end of drying of the coating film, and the particles 16 are likely to sink into the resin base material 11 side.
- the abundance ratio (uneven distribution ratio) of 16 can be adjusted.
- the particles 16 in the light scattering layer 15 are higher than the surface of the binder 17 on the conductive layer 12 side, as shown in FIG. It is easy to configure the light scattering layer 15 so as not to protrude toward the conductive layer 12 side. Accordingly, it is possible to suppress the occurrence of unevenness on the surface of the light scattering layer 15 due to the protrusion of the particles 16 and to improve the flatness of the surface of the light scattering layer 15.
- the surface roughness of the light scattering layer 15 is preferably as small as Ra.
- the arithmetic average roughness Ra is 10 nm or less, and more preferably Ra is 5 nm or less.
- the uneven distribution of the particles 16 in the light scattering layer 15 means that the light scattering layer 15 and the resin substrate are separated from the transparent conductive film 14 side from the center in the thickness direction in the thickness where the binder of the light scattering layer 15 is formed.
- the volume ratio of the particles 16 is different between the transparent conductive film 14 side and the resin base material 11 side.
- the particle abundance ratio of the particles 16 in the region closer to the resin substrate 11 than the center in the thickness direction is such that the particles 16 in the region closer to the transparent conductive film 14 than the center in the thickness direction. It is larger than the particle abundance ratio.
- the calculation method of the particle abundance ratio on the resin base material 11 side is to produce a cross section of the light scattering layer 15 and each region of the region on the resin base material 11 side and the region on the transparent conductive film 14 side from the center in the thickness direction.
- TEM transmission electron microscope
- the particle abundance ratio of the light scattering layer 15 on the resin base material 11 side is preferably more than 50%. Furthermore, the particle abundance ratio of the light scattering layer 15 on the resin base material 11 side is preferably 65% or more, and more preferably 70% or more. The higher the particle abundance ratio of the light scattering layer 15 on the resin base material 11 side, the easier the light extraction is improved and the less ablation occurs.
- the binder 17 preferably has a refractive index nb in light having a wavelength of 633 nm of 1.50 or more and less than 2.00.
- the refractive index nb of the binder 17 is the refractive index of a single material when it is formed of a single material, and in the case of a mixed system, the total value obtained by multiplying the refractive index specific to each material by the mixing ratio. Is the calculated refractive index calculated by
- the role of the particles 16 in the light scattering layer 15 includes a guided light scattering function.
- a guided light scattering function In order to improve the scattering function of guided light, it is necessary to improve the scattering property by the particles 16.
- methods such as increasing the difference in refractive index between the particles 16 and the binder 17, increasing the layer thickness, and increasing the particle density are conceivable.
- the method having the least adverse effect on the performance is to increase the refractive index difference between the particles 16 and the binder 17.
- between the refractive index nb of the binder 17 and the refractive index np of the contained particles 16 is preferably 0.2 or more and 1.0 or less. Especially preferably, it is 0.3 or more.
- between the binder 17 and the particles 16 is 0.2 or more, a scattering effect occurs at the interface between the binder 17 and the particles 16.
- the refractive index np of the particle 16 is made smaller than the refractive index nb of the binder 17, or the refractive index np of the particle 16 is made smaller than the refractive index nb of the binder 17. Also make it bigger.
- the refractive index np of the particles 16 is the refractive index of a single material when it is formed of a single material. In the case of a mixed system, the refractive index peculiar to each material is multiplied by the mixing ratio. It is a calculated refractive index calculated by the sum value.
- the refractive index np of the particles 16 is smaller than the refractive index nb of the binder 17, it is preferable to use low refractive index particles having a refractive index np of less than 1.5 as the particles 16. And it is preferable to use the high refractive index binder whose refractive index nb is 1.6 or more as the binder 17.
- the refractive index np of the particles 16 is larger than the refractive index nb of the binder 17, it is preferable to use high refractive index particles having a refractive index np of 1.7 or more and 3.0 or less as the particles 16.
- the binder 17 it is preferable to use a binder whose refractive index nb is smaller than the refractive index np of the particles 16 by 0.2 or more.
- the light scattering layer 15 has a function of diffusing light by the difference in refractive index between the binder 17 and the particles 16. For this reason, the particles 16 are required to have little adverse effect on other layers and to have high light scattering characteristics.
- the layer thickness of the light scattering layer 15 needs to be thick to some extent in order to ensure the optical path length for causing scattering, but it needs to be thin enough not to cause energy loss due to absorption. For this reason, it is preferable that the thickness of the light-scattering layer 15 is 250 nm or more and 1000 nm or less.
- the scattering in the light scattering layer 15 represents a state in which the haze value (ratio of the scattering transmittance to the total light transmittance) in the single layer of the light scattering layer 15 is 20% or more.
- the haze value of the single layer of the light scattering layer 15 is more preferably 25% or more, and particularly preferably 30% or more. If the haze value is 20% or more, the light scattering property (light extraction efficiency) can be improved.
- the light scattering layer 15 contains 80% or more of spherical particles having an aspect ratio of 2 or less as the particles 16.
- the spherical particles having an aspect ratio of 2 or less preferably have an average particle size of 200 to 500 nm, more preferably 200 to 450 nm, and even more preferably 250 to 400 nm.
- the aspect ratio here is the ratio of the major axis length to the minor axis length of the particle 16.
- SEM scanning electron microscope
- the scattering property can be improved by adjusting the average particle diameter and aspect ratio of the particles 16. Specifically, it is preferable to use particles that are larger than the region that causes Mie scattering in the visible light region. On the other hand, in order to make the particles 16 unevenly distributed on the substrate 11 side and flatten the surface of the light scattering layer 15, it is necessary to make the average particle diameter smaller than the thickness of the light scattering layer 15.
- the average particle diameter of the particles can be measured by image processing of electron micrographs. The particles are photographed at a magnification of 100,000 times, and the length of the long axis of the particles is measured from the image. The average of 100 particles is taken as the average particle diameter.
- the particles 16 are not particularly limited, and any of the above-described low refractive index particles and high refractive index particles can be appropriately selected according to the purpose.
- organic fine particles or inorganic fine particles can be used as the low refractive index particles and the high refractive index particles.
- the refractive index np of the particles 16 is smaller than the refractive index nb of the binder 17
- acrylic resin (1.49), PTFE (1.35), PFA ( 1.35), SiO 2 (1.46), magnesium fluoride (1.38), lithium fluoride (1.392), calcium fluoride (1.399), silicone rubber (1.40), fluoride
- the parentheses indicate typical refractive indexes of particles made of each material.
- the high refractive index particles are described in International Publication No. 2009/014707 and US Pat. No. 6,608,439. Quantum dots can also be suitably used. Among these, inorganic fine particles having a high refractive index are preferable.
- organic fine particles having a high refractive index examples include polymethyl methacrylate beads, acrylic-styrene copolymer beads, melamine beads, polycarbonate beads, styrene beads, cross-linked polystyrene beads, polyvinyl chloride beads, benzoguanamine-melamine formaldehyde beads. Etc.
- the inorganic fine particles having a high refractive index examples include inorganic oxide particles made of at least one oxide selected from zirconium, titanium, aluminum, indium, zinc, tin, antimony and the like.
- Specific examples of the inorganic oxide particles include ZrO 2 , TiO 2 , BaTiO 3 , Al 2 O 3 , In 2 O 3 , ZnO, SnO 2 , Sb 2 O 3 , ITO, SiO 2 , ZrSiO 4 , zeolite.
- TiO 2 , BaTiO 3 , ZrO 2 , ZnO and SnO 2 are preferable, and TiO 2 is most preferable.
- the rutile type is more preferable than the anatase type because the weather resistance of the light scattering layer 15 and the adjacent layer is high because the catalytic activity is low, and the refractive index is high.
- the particles 16 are included in the light scattering layer 15, are used after being subjected to a surface treatment or used without being subjected to a surface treatment from the viewpoint of improving dispersibility and stability in the case of a dispersion described later. Can be selected.
- specific materials for the surface treatment include different inorganic oxides such as silicon oxide and zirconium oxide, metal hydroxides such as aluminum hydroxide, organic acids such as organosiloxane and stearic acid, and the like. It is done. These surface treatment materials may be used individually by 1 type, and may be used in combination of multiple types. Among these, from the viewpoint of the stability of the dispersion, the surface treatment material is preferably a different inorganic oxide and / or metal hydroxide, more preferably a metal hydroxide. In addition, when surface treatment is performed, the surface treatment portion is also included in the particle volume.
- the coating amount is preferably 0.01 to 99% by mass. By making it in the said range, the improvement effect of the dispersibility and stability by surface treatment can fully be acquired. Generally, this coating amount is indicated by the mass ratio of the surface treatment material used on the surface of the particle with respect to the mass of the particle.
- the volume ratio between the particles 16 and the binder 17 is preferably 5 vol% or more and 40 vol% or less.
- the volume ratio (PB ratio) is a ratio of the volume of the binder 17 and the volume of the particles 16 in the entire volume of the light scattering layer 15 [volume of particles / (volume of particles + volume of binder)].
- the PB ratio is 40 vol% or less
- the particle abundance ratio on the resin base material 11 side is easily increased, and the flatness of the surface of the light scattering layer 15 is easily improved. That is, by setting the volume ratio of the particles 16 within the above range, it is possible to suppress the protrusion of the particles 16 from the surface of the light scattering layer 15 due to excess of the particles 16 and to increase the light scattering efficiency and the light extraction efficiency. Can do.
- the particle abundance ratio of the particles 16 in the region of the resin base material 11 with respect to the thickness direction center of the light scattering layer 15 is preferably 50 vol% or more, more preferably 60 vol% or more, and 70 vol%. The above is particularly preferable.
- the light scattering layer 15 can be configured so as not to protrude above the surface on the conductive layer 12 side of the binder 17 (on the conductive layer 12 side). Accordingly, it is possible to suppress the occurrence of unevenness on the surface of the light scattering layer 15 due to the protrusion of the particles 16 and to improve the flatness of the surface of the light scattering layer 15. Furthermore, in the light scattering layer 15, the light extraction efficiency can be improved by increasing the light scattering amount.
- Binder 17 of the light scattering layer 15 either a configuration in which the refractive index np of the particles 16 is smaller than the refractive index nb of the binder 17 or a configuration in which the refractive index np of the particles 16 is larger than the refractive index nb of the binder 17.
- a known binder can be used without any particular limitation.
- a binder can also be used in mixture of multiple types.
- the high refractive index binder applied to the light scattering layer 15 in a configuration in which the refractive index np of the particles 16 is smaller than the refractive index nb of the binder 17 it is preferable to use a binder having a refractive index nb of 1.6 or more.
- Rio Duras TYZ series Rio Duras TYT series (manufactured by Toyo Ink Co., Ltd.), resin coating containing ZrO 2 fine particles (manufactured by Pixellient Technologies), UR series (manufactured by Nissan Chemical Co., Ltd.), Olga-Tix series (manufactured by Matsumoto Fine Chemical Co., Ltd.), PIVVO series (Manufactured by KSM), acrylic resin series, epoxy resin series (manufactured by NTT Advanced Technology), hitaloid series (manufactured by Hitachi Chemical Co., Ltd.) and the like can be used.
- the binder has a refractive index ref of 0.2 or more smaller than the refractive index np of the particles 16. It is preferable to use a binder having a high refractive index as much as possible, and the above-described high refractive index binder can be used. This is because in the case of a low refractive binder, the light coming from the conductive layer 12 side cannot be propagated into the low refractive index binder depending on the penetration angle and is reflected.
- an inorganic material or a compound capable of forming an oxide, nitride, or oxynitride of metal by ultraviolet irradiation under a specific atmosphere can be used.
- a compound which can be modified at a relatively low temperature described in JP-A-8-112879 is preferable.
- polysiloxane having Si—O—Si bond including polysilsesquioxane
- polysilazane having Si—N—Si bond both Si—O—Si bond and Si—N—Si bond
- polysiloxazan containing can be used in combination of two or more.
- the polysiloxane used in the light scattering layer 15 includes R 3 SiO 1/2 , R 2 SiO, RSiO 3/2 and SiO 2 as general structural units.
- R is independently from the group consisting of a hydrogen atom, an alkyl group containing 1 to 20 carbon atoms such as methyl, ethyl, propyl, an aryl group such as phenyl, and an unsaturated alkyl group such as vinyl. Selected.
- Examples of specific polysiloxane groups include PhSiO 3/2 , MeSiO 3/2 , HSiO 3/2 , MePhSiO, Ph 2 SiO, PhViSiO, ViSiO 3/2 , MeHSiO, MeViSiO, Me 2 SiO, Me 3 SiO 1 / 2 etc. Mixtures and copolymers of polysiloxanes can also be used. Vi represents a vinyl group.
- Polysilsesquioxane In the light scattering layer 15, it is preferable to use polysilsesquioxane among the above-mentioned polysiloxanes.
- Polysilsesquioxane is a compound containing silsesquioxane in a structural unit.
- “Silsesquioxane” is a compound represented by RSiO 3/2 and is usually represented by RSiX 3 .
- R is a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, an aralkyl group (also referred to as an aralkyl group), and the like.
- X is a halogen, an alkoxy group, or the like.
- the molecular arrangement of polysilsesquioxane typically has an amorphous structure, a ladder structure, a cage structure, a structure in which a silicon atom is missing from a cage structure, or a silicon-oxygen bond with a cage structure.
- a partially-cleavage structure in which is partially cut is known.
- hydrogen silsesquioxane polymer examples include a hydridosiloxane polymer represented by HSi (OH) x (OR) y O z / 2 .
- Each R is an organic group or a substituted organic group, and forms a hydrolyzable substituent when bonded to silicon by an oxygen atom.
- x 0 to 2
- y 0 to 2
- z 1 to 3
- x + y + z 3.
- R examples include an alkyl group (eg, methyl group, ethyl group, propyl group, butyl group), an aryl group (eg, phenyl group), and an alkenyl group (eg, allyl group, vinyl group).
- alkyl group eg, methyl group, ethyl group, propyl group, butyl group
- aryl group eg, phenyl group
- alkenyl group eg, allyl group, vinyl group.
- polysilazane preferably used in the light scattering layer 15 polysilazane represented by the following general formula (1) can be used.
- R 1 , R 2 and R 3 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 in which all of R 1 , R 2 and R 3 in the general formula (1) are hydrogen atoms, is particularly preferable from the viewpoint of the denseness of the resulting light scattering layer 15 as a film.
- Perhydropolysilazane is presumed to have a linear structure and a ring structure centered on 6-membered and 8-membered rings, and its molecular weight is about 600 to 2000 in terms of number average molecular weight (Mn) (gel Polystyrene conversion by permeation chromatography), which is a liquid or solid substance.
- Polysilazane is commercially available in the form of a solution dissolved in an organic solvent, and the commercially available product can be used as a polysilazane-containing coating solution as it is.
- Examples of commercially available polysilazane solutions include NN120-20, NAX120-20, and NL120-20 manufactured by AZ Electronic Materials.
- an ionizing radiation curable resin composition can be used as the binder 17.
- a method for curing the ionizing radiation curable resin composition a normal curing method, that is, irradiation with an electron beam or ultraviolet light can be used.
- a normal curing method that is, irradiation with an electron beam or ultraviolet light
- 10 to 1000 keV emitted from various electron beam accelerators such as a Cockrowalton type, a bandegraph type, a resonant transformation type, an insulating core transformer type, a linear type, a dynamitron type, and a high frequency type.
- an electron beam having an energy of 30 to 300 keV is used.
- ultraviolet rays emitted from light rays such as an ultrahigh pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc, a xenon arc, and a metal halide lamp can be used.
- the ultraviolet irradiation device examples include a rare gas excimer lamp that emits vacuum ultraviolet rays within a range of 100 to 230 nm.
- Atoms of noble gases such as xenon (Xe), krypton (Kr), argon (Ar), neon (Ne) and the like are called inert gases because they do not form molecules by chemically bonding.
- a rare gas atom (excited atom) that has gained energy by discharge or the like can combine with other atoms to form a molecule.
- the rare gas is Xe (xenon)
- excimer light of 172 nm is emitted when the excited excimer molecule Xe 2 * transitions to the ground state, as shown in the following reaction formula.
- ⁇ Excimer lamps are characterized by high efficiency because radiation concentrates on one wavelength and almost no other light is emitted. Moreover, since extra light is not radiated
- a dielectric barrier discharge lamp has a structure in which a discharge is generated between electrodes via a dielectric. Generally, at least one electrode is disposed between a discharge vessel made of a dielectric and the outside thereof. That's fine.
- a dielectric barrier discharge lamp for example, a rare gas such as xenon is enclosed in a double cylindrical discharge vessel composed of a thick tube and a thin tube made of quartz glass, and a net-like second discharge vessel is formed outside the discharge vessel. There is one in which one electrode is provided and another electrode is provided inside the inner tube.
- a dielectric barrier discharge lamp generates a dielectric barrier discharge inside a discharge vessel by applying a high frequency voltage between electrodes, and generates excimer light when excimer molecules such as xenon generated by the discharge dissociate. .
- Excimer lamps can be lit with low power input because of their high light generation efficiency. In addition, since light having a long wavelength that causes a temperature rise is not emitted and energy is emitted at a single wavelength in the ultraviolet region, the temperature rise of the irradiation object due to the irradiation light itself is suppressed.
- a pattern is formed on one surface of the resin base material 11 by a fine metal wire 13 that is a fine wire containing a metal.
- the fine metal wires 13 are formed in a predetermined pattern having openings on one surface of the resin base material 11. A portion where the fine metal wires 13 are not formed on the resin base material 11 becomes an opening (translucent window).
- the shape of the fine line pattern of the fine metal lines 13 is not particularly limited. For example, a stripe pattern, a lattice pattern, or a random mesh pattern can be used.
- the fine metal wire 13 is formed so as to be in direct contact with the light scattering layer 15. Further, another layer may be formed between the fine metal wire 13 and the light scattering layer 15.
- a transparent conductive film 14 is formed as a continuous layer in the surface direction on the fine metal wires 13. By covering the metal thin wire 13 and forming the transparent conductive film 14, the conductive layer 12 having a low resistance and a uniform surface resistance can be formed.
- the transparent conductive film 14 is formed so as to be in direct contact with the light scattering layer 15 except for the portion where the fine metal wires 13 are formed. Further, another layer may be formed between the transparent conductive film 14 and the light scattering layer 15.
- the fine metal wires 13 constituting the conductive layer 12 are formed with a metal content ratio such that metal is a main component and conductivity can be obtained.
- the ratio of the metal in the fine metal wire is preferably 50% by mass or more.
- the ratio of the opening portion is preferably 80% or more from the viewpoint of transparency.
- the aperture ratio of a stripe pattern having a line width of 100 ⁇ m and a line interval of 1 mm is approximately 90%.
- the line width of the fine metal wire 13 is preferably in the range of 10 to 200 ⁇ m, more preferably in the range of 10 to 100 ⁇ m. Desired conductivity is obtained when the line width of the fine metal wire 13 is 10 ⁇ m or more, and the transparency of the transparent conductive member is improved by setting it to 200 ⁇ m or less.
- the distance between the fine metal wires is preferably in the range of 0.5 to 4 mm.
- the height (thickness) of the fine metal wires 13 is preferably in the range of 0.1 to 5.0 ⁇ m, and more preferably in the range of 0.1 to 2.0 ⁇ m. Desired conductivity is easily obtained when the height of the fine metal wires 13 is 0.1 ⁇ m or more. Moreover, when using for an organic electronic device by being 5.0 micrometers or less, the influence which the uneven
- Metal ink composition The formation of the fine metal wires 13 is preferably performed by preparing and applying a metal ink composition in which a metal or a metal forming material is blended, and then appropriately selecting post-treatments such as a drying treatment and a firing treatment.
- the metal (single metal or alloy) blended in the metal ink composition is preferably in the form of particles or fibers (tube shape, wire shape, etc.), and more preferably metal nanoparticles. Moreover, it is preferable to form from the metal formation material which has a metal atom (element) and produces a metal by structural changes, such as decomposition
- the metal and the metal forming material in the metal ink composition may be only one type, or two or more types, and in the case of two or more types, the combination and ratio can be arbitrarily adjusted.
- metals used for the metal nanoparticles include metals such as gold, silver, copper and platinum, and alloys containing these as main components.
- gold and silver are preferable from the viewpoints of excellent light reflectance and further improving the light emission efficiency of the obtained organic electronic device.
- These metals or alloys can be used alone or in combination of two or more.
- the metal ink composition is preferably a metal colloid or metal nanoparticle dispersion liquid in which the surface of metal nanoparticles is coated with a protective agent and stably dispersed in a solvent.
- the average particle diameter of the metal nanoparticles in the metal ink composition is preferably 1000 nm or less from the atomic scale.
- the metal nanoparticles preferably have an average particle size in the range of 3 to 300 nm, and more preferably in the range of 5 to 100 nm.
- silver nanoparticles having an average particle diameter of 3 to 100 nm are preferable.
- the metal nanowire is preferably a silver wire having a width of 1 nm or more and less than 1000 nm, preferably 1 to 100 nm.
- the average particle diameter of the metal nanoparticles and the metal colloid and the width of the metal fine wire are obtained by measuring the particle diameter of the metal nanoparticles and the width of the metal nanowire in the dispersion using a transmission electron microscope (TEM).
- TEM transmission electron microscope
- the average particle diameter can be calculated by measuring the particle diameters of 300 independent metal nanoparticles that are not overlapped among the particles observed in the TEM image.
- an organic ⁇ -junction ligand is preferable. Conductivity is imparted to the metal colloid by ⁇ -junction of the organic ⁇ -conjugated ligand to the metal nanoparticles.
- the organic (pi) junction ligand the 1 type, or 2 or more types of compound chosen from the group which consists of a phthalocyanine derivative, a naphthalocyanine derivative, and a porphyrin derivative is preferable.
- the organic ⁇ -junction ligand in order to improve coordination to metal nanoparticles and dispersibility in a dispersion medium, an amino group, an alkylamino group, a mercapto group, a hydroxyl group, At least one selected from a carboxyl group, a phosphine group, a phosphonic acid group, a sulfonic acid group, a halogen group, a selenol group, a sulfide group, a selenoether group, an amide group, an imide group, a cyano group, a nitro group, and salts thereof It is preferable to have a substituent.
- the organic ⁇ -junction ligand the organic ⁇ -conjugated ligand described in International Publication No. 2011/114713 pamphlet can be used.
- OTAN 2,3,11,12,20,21,29,30-octakis [(2-N, N-dimethylaminoethyl) thio] naphthalocyanine
- OCAN 2,3,11,12,20,21,29,30-naphthalocyanine octacarboxylic acid
- Examples of a method for preparing a metal nanoparticle dispersion containing an organic ⁇ -junction ligand include a liquid phase reduction method.
- the production of the organic ⁇ -junction ligand of this embodiment and the preparation of the metal nanoparticle dispersion containing the organic ⁇ -junction ligand are described in paragraphs [0039] to [0060] of International Publication No. 2011/114713. It can be performed according to the method described.
- the average particle size of the metal colloid is usually 3 nm or more and 500 nm or less, preferably 5 nm or more and 50 nm or less. When the average particle diameter of the metal colloid is within the above range, fusion between particles is likely to occur, and the conductivity of the obtained metal thin wire 13 can be improved.
- a protective agent that coats the surface of the metal nanoparticles in the metal nanoparticle dispersion it is preferable to use a protective agent that removes the ligand at a low temperature of 200 ° C. or lower. As a result, the protective agent is detached by low temperature or low energy, the metal nanoparticles are fused, and conductivity can be imparted.
- Specific examples include metal nanoparticle dispersions described in JP2013-142173A, JP2012-162767A, JP2014-139343A, Patent No. 5606439, and the like.
- an organic silver complex compound produced by reacting a silver compound represented by [Ag n X] with an ammonium carbamate compound.
- n is an integer of 1 to 4
- X is oxygen, sulfur, halogen, cyano, cyanate, carbonate, nitrate, nitrate, sulfate, phosphate, thiocyanate, chlorate, perchlorate, tetrafluoroborate, A substituent selected from the group consisting of acetylacetonate and carboxylate.
- the silver compound examples include silver oxide, thiocyanate silver, silver cyanide, silver cyanate, silver carbonate, silver nitrate, silver nitrite, silver sulfate, silver phosphate, silver perchlorate, silver tetrafluoroborate, acetylacetate. Examples thereof include silver nitrate, silver acetate, silver lactate, and silver oxalate permeation.
- use of silver oxide or silver carbonate is preferable in terms of reactivity and post-treatment.
- ammonium carbamate compounds include ammonium carbamate, ethyl ammonium ethyl carbamate, isopropyl ammonium isopropyl carbamate, n-butyl ammonium n-butyl carbamate, isobutyl ammonium isobutyl carbamate, t-butyl ammonium t-butyl carbamate, 2-ethylhexyl ammonium 2 -Ethylhexyl carbamate, octadecyl ammonium octadecyl carbamate, 2-methoxyethyl ammonium 2-methoxyethyl carbamate, 2-cyanoethyl ammonium 2-cyanoethyl carbamate, dibutyl ammonium dibutyl carbamate, dioctadecyl ammonium dioctadecyl carbamate, methyl decyl ammonium methyl dec
- the organic silver complex compound can be prepared by the method described in JP 2011-48795 A.
- one or more of the above silver compounds and one or more of the above ammonium carbamate compounds can be directly reacted without using a solvent in a normal pressure or pressurized state of a nitrogen atmosphere.
- alcohols such as methanol, ethanol, isopropanol and butanol
- glycols such as ethylene glycol and glycerin
- acetates such as ethyl acetate, butyl acetate and carbitol acetate
- ethers such as diethyl ether, tetrahydrofuran and dioxane
- Ketones such as methyl ethyl ketone and acetone
- hydrocarbons such as hexane and heptane
- aromatics such as benzene and toluene
- halogen substituted solvents such as chloroform, methylene chloride and carbon tetrachloride Can be reacted.
- the structure of the organic silver complex compound can be represented by [Ag (A) m ].
- A is the ammonium carbamate compound, and m is 0.7 to 2.5.
- organic silver complex compound is well soluble in various solvents including solvents used for the production of organic silver complex compounds such as alcohols such as methanol, esters such as ethyl acetate, ethers such as tetrahydrofuran. For this reason, the organic silver complex compound can be easily applied to a coating or printing process as a metal ink composition.
- examples of the metal silver forming material include silver carboxylate having a group represented by the formula [—COOAg].
- the carboxylate silver is not particularly limited as long as it has a group represented by the formula [—COOAg].
- the number of groups represented by the formula [—COOAg] may be one or two or more.
- the position of the group represented by the formula [—COOAg] in the silver carboxylate is not particularly limited.
- the silver carboxylate is preferably at least one selected from the group consisting of silver ⁇ -ketocarboxylate and silver carboxylate (4) described in JP-A-2015-66695.
- a material for forming metallic silver not only silver ⁇ -ketocarboxylate and silver carboxylate (4), but also silver carboxylate having a group represented by the formula [—COOAg] including them can be used. it can.
- the metal ink composition contains the above-mentioned silver carboxylate as a metal forming material
- the amine compound and quaternary ammonium salt having 25 or less carbon atoms, ammonia, and the amine compound or ammonia react with the acid together with the silver carboxylate. It is preferable that at least one nitrogen-containing compound selected from the group consisting of ammonium salts is blended.
- the amine compound has 1 to 25 carbon atoms, and may be any of primary amine, secondary amine, and tertiary amine.
- the quaternary ammonium salt has 4 to 25 carbon atoms.
- the amine compound and the quaternary ammonium salt may be either chain or cyclic. Further, the number of nitrogen atoms constituting the amine moiety or ammonium salt moiety (for example, the nitrogen atom constituting the amino group [—NH 2 ] of the primary amine) may be 1 or 2 or more.
- the transparent conductive film 14 constituting the conductive layer 12 is provided on the surface of the light scattering layer 15 so as to cover the surface of the fine metal wire 13.
- the transparent conductive film 14 is a layer containing a conductive material for conducting electricity in the transparent conductive member 10.
- a metal thin film such as Au, Ag, Pt, Cu, Rh, Pd, Al, Cr, In 2 O 3 , CdO, CdIn 2 O 4 , Cd 2 SnO 4 , TiO 2 , SnO 2 , ZnO, ITO (indium / tin oxide), IZO (indium / zinc oxide), IGO (indium / gallium oxide), IWZO (indium / tungsten / zinc oxide), AZO (Al-doped zinc oxide) , GZO (Ga doped zinc oxide), ATO (antimony tin oxide), FTO (F doped tin oxide), TiN, ZrN, HfN, TiO x , VO x , CuI, InN, GaN, CuAlO 2 , CuGaO 2 , Examples thereof include conductive inorganic compound layers such as SrCu 2 O 2 , LaB 6 , and RuO 2 .
- These compounds may be crystalline or non-crystalline.
- an amorphous material such as IDIXO (In 2 O 3 —ZnO) that can produce the transparent conductive member 10 may be used.
- a conductive polymer may be used, and examples thereof include polyacetylene, poly (p-phenylene vinylene), polypyrrole, polythiophene, polyaniline, poly (p-phenylene sulfide) and the like.
- the transparent conductive film 14 may contain only one kind of these conductive materials, or may contain two or more kinds. There is no restriction
- the transparent conductive film 14 is preferably formed using a conductive metal oxide having a volume resistivity lower than 1 ⁇ 10 1 ⁇ ⁇ cm.
- the volume resistivity can be obtained by measuring the sheet resistance and the film thickness measured in accordance with the resistivity test method of the conductive plastic of JIS K 7194-1994 by the four-probe method.
- the film thickness can be measured using a contact-type surface shape measuring device (for example, DECTAK) or an optical interference surface shape measuring device (for example, WYKO).
- the transparent conductive film 14 has a sheet resistance of 10,000 ⁇ / sq. Or less, preferably 2000 ⁇ / sq. The following is more preferable.
- the thickness of the transparent conductive film 14 is preferably in the range of 5 nm to 15 nm when a metal thin film is used. Further, when a metal oxide or a conductive inorganic compound is used, the thickness can be in the range of 10 to 500 nm. From the viewpoint of increasing the conductivity, the thickness is preferably in the range of 100 to 500 nm. From the viewpoint of enhancing the smoothness of the surface, the thickness is preferably 50 nm or more.
- the transparent conductive film 14 it is preferable to select a metal oxide among the above-mentioned materials as a material that can ensure high transparency even when the thickness is increased. Moreover, when the transparent conductive film 14 is provided with a thickness of about 150 nm, it is difficult to ensure transparency with the metal and ITO described above. For this reason, it is preferable to use IZO, AZO, GZO, ATO, ZnO, SnO 2 , or FTO for the transparent conductive film 14.
- the transparent conductive film 14 preferably has an arithmetic average roughness Ra of 5 nm or less. Furthermore, Ra is preferably 3 nm or less.
- the arithmetic average roughness Ra is measured using, for example, an atomic force microscope (manufactured by Digital Instruments).
- the resin base material 11 has high light transmittance, there will be no restriction
- a resin substrate, a resin film, and the like are preferable, but a transparent resin film is preferably used from the viewpoints of productivity and performance such as lightness and flexibility.
- polyester-type resin such as a polyethylene terephthalate (PET), a polyethylene naphthalate (PEN), a modified polyester, a polyethylene (PE) resin, a polypropylene (PP) resin, a polystyrene Resins, polyolefin resins such as cyclic olefin resins, vinyl resins such as polyvinyl chloride and polyvinylidene chloride, polyether ether ketone (PEEK) resins, polysulfone (PSF) resins, polyether sulfone (PES) resins, polycarbonate (PC) resin, polyamide resin, polyimide resin, acrylic resin, triacetyl cellulose (TAC) resin, etc. are mentioned. These resins may be used alone or in combination. Moreover, the resin base material 11 may be an unstretched film or a stretched film.
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- a modified polyester such as polyethylene (PE
- the resin base material 11 has high transparency because the transparent conductive member 10 can be used as a transparent electrode of an electronic device.
- High transparency means that the total light transmittance in the visible light wavelength region measured by a method based on JIS K 7361-1: 1997 (plastic-transparent material total light transmittance test method) is 50% or more. This is more preferably 80% or more.
- the resin substrate 11 may be subjected to a surface activation treatment in order to improve the adhesion with the light scattering layer 15 formed on the resin substrate 11.
- a hard coat layer may be provided.
- the surface activation treatment include corona discharge treatment, flame treatment, ultraviolet treatment, high frequency treatment, glow discharge treatment, active plasma treatment, and laser treatment.
- the material for the hard coat layer include polyester, polyamide, polyurethane, vinyl copolymer, butadiene copolymer, acrylic copolymer, vinylidene copolymer, and epoxy copolymer.
- An ultraviolet curable resin can be preferably used.
- the light scattering layer 15 may be a single layer, but the adhesiveness is further improved when it has a multilayer structure.
- FIG. 2 shows a schematic configuration of a modified example of the transparent conductive member.
- a transparent conductive member 10 ⁇ / b> A shown in FIG. 2 includes a resin base material 11, a light scattering layer 15 provided on the resin base material 11, an ablation prevention layer 18 provided on the light scattering layer 15, and an ablation prevention layer 18. And a conductive layer 12 provided thereon.
- the transparent conductive member 10A having this configuration is different from the transparent conductive member of the above-described embodiment only in having the ablation preventing layer 18, and other configurations are the same as those of the transparent conductive member of the above-described embodiment. Accordingly, in the following description, only the configuration related to the ablation preventing layer 18 will be described, and description of other configurations will be omitted.
- an ablation preventing layer 18 is provided between the light scattering layer 15 and the conductive layer 12.
- the ablation preventing layer 18 is provided so as to be in direct contact with the light scattering layer 15.
- the fine metal wire 13 is formed immediately above the ablation preventing layer 18, and the ablation preventing layer 18 is formed so as to be in direct contact with the fine metal wire 13.
- the transparent conductive film 14 is formed so as to be in direct contact with the ablation preventing layer 18 except for the portion where the thin metal wire 13 is formed.
- Other layers may be formed between the light scattering layer 15 and the ablation preventing layer 18 and between the ablation preventing layer 18 and the conductive layer 12.
- the ablation preventing layer 18 is a layer for suppressing permeation or the like of the solvent or the like in the metal ink composition into the light scattering layer 15 when applying and patterning the metal ink composition for forming the fine metal wires 13. is there.
- the solvent or the like in the metal ink composition penetrates into the light scattering layer 15, the solvent is vaporized by heating at the time of forming the fine metal wire, causing ablation of the fine metal wire.
- the configuration of the anti-ablation layer 18 is not particularly limited as long as it has a high solvent barrier property. Further, it is preferable that the film is a uniform film free from failure such as pinholes so that the solvent in the metal ink composition does not come into contact with the light scattering layer 15.
- the anti-ablation layer 18 since the anti-ablation layer 18 only needs to have a solvent barrier property, it does not need to have flatness or other functions. For this reason, the ablation prevention layer should just have sufficient thickness only to implement
- the flatness of the light scattering layer is low and the unevenness of the surface is high, so a thin film of about 10 to 100 nm is formed on the light scattering layer.
- the material for forming the film is likely to gather in the concave portion, and the material for forming the film on the convex portion is not easily disposed. For this reason, it is difficult to form a film on the convex part, and a failure such as a pinhole occurs on the convex part, and a uniform film cannot be formed.
- the solvent of the metal ink composition penetrates into the light scattering layer 15 from the broken portion of the film, and ablation occurs during firing.
- the transparent conductive member 10A since the light scattering layer 15 has high flatness, even if the thickness of the ablation preventing layer 18 is as thin as about 10 nm, the material for forming the film is light. A film that is uniformly disposed on the scattering layer 15 and that does not fail is easily formed. Therefore, in the transparent conductive member 10A, it is possible to form the ablation preventing layer 18 which is thin and does not fail.
- any material having a solvent barrier property can be applied to the ablation preventing layer 18 without any particular limitation.
- polyethylene, polypropylene, ethylene-vinyl alcohol copolymer resin, polyvinylidene chloride, fluorine-based resin, polysiloxane, polysilazane, polysiloxazan, silicon dioxide, silicon oxynitride compound, silicon nitride compound, niobium pentoxide, etc. are applied. be able to. In view of luminous efficiency, silicon compounds are particularly preferred.
- the material of the anti-ablation layer 18 is preferably a material having a refractive index close to that of the light scattering layer.
- a resin base material 11 is prepared.
- a gas barrier film having a gas barrier layer formed in advance as needed may be prepared as the resin base material 11.
- a particle-containing layer is formed on the resin substrate 11, or a resin substrate 11 on which a particle-containing layer is formed in advance is prepared.
- the light scattering layer 15 is formed on the prepared resin base material 11.
- the light scattering layer 15 is formed by preparing a dispersion liquid for forming a light scattering layer by dispersing the binder 17 and the particles 16 in a solvent and applying the dispersion liquid onto a resin substrate.
- the dispersion solvent used in the dispersion is not particularly limited, but it is preferable to select a solvent that does not cause the binder 17 to precipitate and the particles 16 to aggregate. From the viewpoint of dispersibility, a method in which a liquid obtained by mixing the binder 17 and the particles 16 is dispersed by a method such as ultrasonic treatment or bead mill treatment and then filtered by a filter or the like is preferable.
- any appropriate method can be selected as a method for applying the dispersion liquid for forming the light scattering layer.
- various printing methods such as a gravure printing method, a flexographic printing method, an offset printing method, a screen printing method, and an inkjet printing method.
- coating methods such as roll coating, bar coating, dip coating, spin coating, casting, die coating, blade coating, curtain coating, spray coating, and doctor coating.
- the formed coating film is dried by a known heat drying method such as hot air drying or infrared drying, or natural drying.
- the temperature at which the heat drying is performed can be appropriately selected according to the resin substrate 11 to be used. Heat drying is preferably performed at a temperature of 200 ° C. or lower. Further, depending on the material of the binder 17 to be used, a process such as curing by light energy such as ultraviolet rays or thermal curing with little damage to the resin substrate 11 may be performed.
- the filament temperature of the light source is 1600 as a drying method. It is preferable to use an infrared heater in the range of ⁇ 3000 ° C. Since the hydroxy group has absorption at a specific wavelength emitted from the infrared heater, the solvent can be dried. On the other hand, since polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) as the resin base material 11 has little absorption of a specific wavelength emitted from the infrared heater, thermal damage to the resin base material 11 is small.
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- the polar solvent having a hydroxy group includes water (pure water such as distilled water and deionized water is preferred), alcohol solvents such as methanol and ethanol, glycols, glycol ethers, and a mixture of water and alcohol. A solvent etc. are mentioned.
- glycol ether organic solvents include ethyl carbitol, butyl carbitol, and the like.
- Specific examples of the alcohol-based organic solvent include 1-propanol, 2-propanol, n-butanol, 2-butanol, diacetone alcohol, butoxyethanol and the like in addition to the above-described methanol and ethanol. .
- the anti-ablation layer 18 is formed on the light scattering layer 15.
- the ablation preventing layer 18 may be formed as necessary.
- the method for forming the ablation preventing layer 18 is not particularly limited.
- a liquid composition containing these resins is prepared, and this liquid composition is applied on the light scattering layer 15 and then dried to be ablation-preventing layer 18.
- this liquid composition can be apply
- the ablation preventing layer 18 can be formed using a vacuum deposition method or a sputtering method.
- vapor deposition methods include resistance heating vapor deposition, electron beam vapor deposition, ion plating, and ion beam vapor deposition.
- a BMC-800T vapor deposition machine manufactured by SYNCHRON Co., Ltd. can be used as the vapor deposition apparatus.
- the fine metal wires 13 are formed on the light scattering layer 15 or the ablation preventing layer 18.
- a formation method of the metal fine wire 13 A conventionally well-known method can be utilized.
- a method using a photolithography method, a coating method, or a printing method using a metal ink composition can be used.
- the metal ink composition contains the above-mentioned metal nanoparticles or metal colloid and a solvent, and may contain additives such as a dispersant, a viscosity modifier, and a binder.
- additives such as a dispersant, a viscosity modifier, and a binder.
- a solvent contained in the composition containing a metal nanoparticle or a metal colloid The compound which has OH group is preferable at the point which can volatilize a solvent efficiently by mid-infrared irradiation, water, alcohol, Glycol ether is preferred.
- Solvents used in compositions containing metal nanoparticles and metal colloids include water, methanol, ethanol, propanol, propanol, butanol, pentanol, hexanol, heptanol, octanol, nonanol, decanol, undecanol, dodecanol, tetradecanol, Hexadecanol, hexanediol, heptanediol, octanediol, nonanediol, decanediol, farnesol, dedecadienol, linalool, geraniol, nerol, heptadienol, tetradecenol, hexadecenol, phytol, oleyl alcohol, dedecenol, decenol, unde Silenyl alcohol, nonenol, citronellol,
- a method generally used for electrode pattern formation can be applied.
- the gravure printing method include the methods described in JP2009-295980A, JP2009-259826A, JP2009-96189A, and JP2009-90662A, and the like.
- methods described in JP-A Nos. 2004-268319 and 2003-168560 are described.
- screen printing method JP-A 2010-34161, JP-A 2010-10245, JP-A 2009-302345 are described.
- Examples of the method described in JP-A No. 2011-180562, JP-A No. 2000-127410, and JP-A No. 8-238774 are examples of the ink jet printing method.
- a metal ink composition is formed on the entire surface of the light scattering layer 15 by printing or coating, After performing a drying process and a baking process, which will be described later, the film is processed into a desired pattern by etching using a known photolithography method.
- the composition containing the coated metal nanoparticles or metal colloid is dried.
- the drying process can be performed using a known drying method. Drying methods include, for example, air cooling drying, convection heat transfer drying using hot air, radiant heat drying using infrared rays, conductive heat transfer drying using a hot plate, vacuum drying, internal using microwaves Exothermic drying, IPA vapor drying, Marangoni drying, Rotagoni drying, freeze drying, and the like can be used.
- the drying by heating is preferably carried out at a temperature within a temperature range of 50 to 200 ° C. so that the resin base material 11 is not deformed. It is more preferable to heat the resin base material 11 under the condition that the surface temperature is 50 to 150 ° C. When a PET substrate is used as the substrate, it is particularly preferable to heat in a temperature range of 100 ° C. or lower.
- the firing time depends on the temperature and the size of the metal nanoparticles used, but is preferably in the range of 10 seconds to 30 minutes, and in the range of 10 seconds to 15 minutes from the viewpoint of productivity. More preferably, it is in the range of 10 seconds to 5 minutes.
- the drying process it is preferable to perform a drying process by infrared irradiation.
- a specific wavelength region By selectively using a specific wavelength region, it is possible to selectively irradiate a specific wavelength effective for the cutting of the absorption region of the resin substrate 11 or the solvent of the metal ink composition.
- an infrared heater in which the filament temperature of the light source is in the range of 1600 to 3000 ° C.
- the dried metal ink composition pattern is baked.
- the drying process may sufficiently exhibit conductivity, so the firing step is not performed. May be.
- the firing of the pattern of the metal ink composition is preferably performed by light irradiation (flash firing) using a flash lamp in order to improve the conductivity of the transparent conductive member 10.
- flash firing a discharge tube of a flash lamp used in flash firing
- a discharge tube of xenon, helium, neon, argon or the like can be used, but a xenon lamp is preferably used.
- the preferable spectral band of the flash lamp is preferably in the range of 240 to 2000 nm. Within this range, there is little damage such as thermal deformation of the resin base material 11 due to flash firing.
- the light irradiation conditions of the flash lamp are arbitrary, but the total light irradiation energy is preferably in the range of 0.1 to 50 J / cm 2 , and preferably in the range of 0.5 to 10 J / cm 2. More preferred.
- the light irradiation time is preferably in the range of 10 ⁇ sec to 100 msec, and more preferably in the range of 100 ⁇ sec to 10 msec. Further, the number of times of light irradiation may be one time or a plurality of times, and it is preferably performed in the range of 1-50 times.
- the flash lamp irradiation on the resin base material 11 is preferably performed from the side of the resin base material 11 on which the pattern of the metal ink composition is formed.
- the resin base material 11 is transparent, it may be irradiated from the resin base material 11 side or from both surfaces of the resin base material 11.
- the surface temperature of the resin base material 11 at the time of flash firing includes the heat resistance temperature of the resin base material 11, the boiling point (vapor pressure) of the dispersion medium of the solvent contained in the metal ink composition, the type and pressure of the atmospheric gas,
- the determination may be made in consideration of the thermal behavior such as dispersibility and oxidation of the metal ink composition, and it is preferably performed at room temperature or higher and 200 ° C. or lower.
- the flash lamp light irradiation device only needs to satisfy the above irradiation energy and irradiation time.
- flash baking may be performed in air
- a transparent conductive film 14 is formed on the entire surface of the formation region of the conductive layer 12 so as to cover the fine metal wires 13.
- the transparent conductive film 14 can be formed by a sputtering method, an ion plating method, or the like using the above-described metal oxide sputtering target.
- the transparent conductive film 14 is formed by various sputtering methods, ion plating methods, and the like in the same manner as in the case of forming a conventional metal oxide layer except that the temperature in the film forming apparatus is 200 ° C. or lower. A film can be formed. By setting the temperature in the film forming apparatus to 200 ° C. or lower, no crystal phase is generated in the metal oxide layer, and the transparent conductive film 14 can be manufactured.
- the substrate temperature during film formation is preferably 90 ° C. or lower, particularly 70 ° C. or lower.
- the substrate temperature during film formation is preferably 90 ° C. or lower, particularly 70 ° C. or lower.
- the temperature in the film forming apparatus is set to 70 ° C. or lower, for example.
- a cooling mechanism is provided on the substrate side so that the substrate temperature is 70 ° C. or lower.
- Examples of the sputtering method for forming the transparent conductive film 14 include DC sputtering, RF sputtering, DC magnetron sputtering, RF magnetron sputtering, ECR plasma sputtering, and ion beam sputtering.
- the transparent conductive film 14 can be formed, for example, by a direct current magnetron sputtering method with a distance between target substrates of 50 to 100 mm during sputtering and a sputtering gas pressure of 0.5 to 1.5 Pa.
- the distance between the target substrates if the distance between the target substrates is shorter than 50 mm, the kinetic energy of the sputtered particles to be deposited increases, so that the damage received by the resin base material 11 increases. In addition, the film thickness becomes non-uniform and the film thickness distribution becomes worse. When the distance between the target substrates is longer than 100 mm, the film thickness distribution is improved, but the kinetic energy of the sputtered particles to be deposited becomes too low, densification due to diffusion hardly occurs, and the density of the transparent conductive film 14 becomes low.
- the sputtering gas pressure if the sputtering gas pressure is lower than 0.5 Pa, the kinetic energy of the sputtered particles to be deposited increases, so that the resin substrate 11 suffers more damage.
- the sputtering gas pressure is higher than 1.5 Pa, not only the film formation rate is slowed, but also the kinetic energy of the sputtered particles deposited becomes too low, densification due to diffusion does not occur, and the density of the transparent conductive film 14 is low. Therefore, it is not preferable.
- Organic electroluminescence device Next, an embodiment of an organic electroluminescence element (organic EL element) using the above-described transparent conductive member will be described.
- the organic EL element of the present embodiment has a configuration in which the conductive layer of the transparent conductive member described above is a first electrode (transparent electrode), and a light emitting unit and a second electrode (counter electrode) are provided on the first electrode. It is. For this reason, in the following description of the organic EL element, detailed description of the same configuration as the above-described transparent conductive member is omitted.
- the structure of the organic EL element of this embodiment is shown in FIG.
- the organic EL element 20 shown in FIG. 3 includes a conductive layer 12 (first electrode) of the transparent conductive member 10A and a second electrode 22, and a light emitting unit 21 is provided as an organic functional layer between the electrodes.
- the transparent conductive member 10A has the same configuration as that shown in FIG.
- the “light-emitting unit” refers to a light-emitting body (unit) composed mainly of an organic functional layer such as a light-emitting layer, a hole transport layer, and an electron transport layer containing at least various organic compounds.
- the luminous body is sandwiched between a pair of electrodes composed of an anode and a cathode, and the holes supplied from the anode and the electrons supplied from the cathode are recombined in the luminous body. Emits light.
- the organic EL element may include a plurality of the light emitting units according to a desired emission color.
- the organic EL element 20 is configured as a bottom emission type in which generated light (hereinafter referred to as emitted light h) is extracted from at least the resin base material 11 side of the transparent conductive member 10A.
- Transparent means that the light transmittance at a wavelength of 550 nm is 50% or more.
- the main component is a component having the highest ratio in the entire configuration.
- extraction electrodes are provided at the ends of the conductive layer 12 and the second electrode 22 of the transparent conductive member 10A.
- the conductive layer 12 and the second electrode 22 of the transparent conductive member 10A and an external power source are electrically connected via an extraction electrode.
- the layer structure of the organic EL element 20 is not limited and may be a general layer structure.
- the conductive layer 12 of the transparent conductive member 10A functions as an anode (that is, an anode) and the second electrode 22 functions as a cathode (that is, a cathode)
- the light emitting unit 21 is connected to the transparent conductive member 10A from the conductive layer 12 side.
- a structure in which a hole injection layer / a hole transport layer / a light emitting layer / an electron transport layer / an electron injection layer are stacked in order is exemplified, but among these, it is essential to have a light emitting layer composed of at least an organic material It is.
- the hole injection layer and the hole transport layer may be provided as a hole transport injection layer.
- the electron transport layer and the electron injection layer may be provided as an electron transport injection layer.
- the electron injection layer may be made of an inorganic material.
- the light-emitting unit 21 may have a hole blocking layer, an electron blocking layer, or the like laminated as necessary.
- the light emitting layer may have a structure in which each color light emitting layer that generates light emitted in each wavelength region is laminated, and each color light emitting layer is laminated via a non-light emitting auxiliary layer.
- the auxiliary layer may function as a hole blocking layer or an electron blocking layer.
- the second electrode 22 as the cathode may also have a laminated structure as necessary.
- the organic EL element 20 may be an element having a so-called tandem structure in which a plurality of light emitting units 21 including at least one light emitting layer are stacked.
- Examples of typical element configurations of the tandem structure include the following configurations. [Anode / first light emitting unit / intermediate connector layer / second light emitting unit / intermediate connector layer / third light emitting unit / cathode]
- the first light emitting unit, the second light emitting unit, and the third light emitting unit may all be the same or different. Further, the two light emitting units may be the same, and the remaining one may be different.
- the plurality of light emitting units 21 may be directly stacked or may be stacked via an intermediate connector layer.
- the intermediate connector layer is also commonly referred to as an intermediate electrode, intermediate conductive layer, charge generation layer, electron extraction layer, connection layer, or intermediate insulating layer. Electrons are transferred to the anode side adjacent layer and holes are connected to the cathode side adjacent layer.
- a known material structure can be used as long as the layer has a function of supplying. Examples of materials used for the intermediate connector layer include ITO (indium tin oxide), IZO (indium zinc oxide), ZnO 2 , TiN, ZrN, HfN, TiO x , VO x , CuI, InN, and GaN.
- Examples of a preferable configuration in the light emitting unit 21 include, but are not limited to, a configuration in which the anode and the cathode are removed from the configuration described in the representative element configuration.
- Specific examples of the tandem organic EL element include, for example, US Pat. No. 6,337,492, US Pat. No. 7,420,203, US Pat. No. 7,473,923, US Pat. No. 6,872,472, US Pat. No. 6,107,734. Specification, U.S. Pat. No. 6,337,492, International Publication No.
- JP-A-2006-228712 JP-A-2006-24791, JP-A-2006-49393, JP-A-2006-49394 JP-A-2006-49396
- JP-A-2011-96679 JP-A-2005-340187, JP-A-4711424, JP-A-3496868, JP-A-3848564, JP-A-4421169, JP 2010-192719, JP 009-076929, JP 2008-078414, JP 2007-059848, JP 2003-272860, JP 2003-045676, WO 2005/094130, etc.
- Examples of the structure and constituent materials are given.
- the organic EL element 20 includes a light emitting unit 21 that is sandwiched between a pair of electrodes of a first electrode and a second electrode 22 made of the conductive layer 12 of the transparent conductive member 10A.
- One of the conductive layer 12 (first electrode) and the second electrode 22 of the transparent conductive member 10A serves as the anode of the organic EL element 20, and the other serves as the cathode.
- the conductive layer 12 of the transparent conductive member 10A is made of a transparent conductive material
- the second electrode 22 is made of a highly reflective material.
- the 2nd electrode 22 is also comprised with a transparent conductive material.
- Electrode In the organic EL element 20, when the second electrode 22 is used as an anode, a material having a work function (4 eV or more) of a metal, an alloy, an electrically conductive compound, or a mixture thereof is preferably used.
- the electrode material that can constitute the anode include conductive transparent materials such as metals such as Au and Ag, CuI, indium tin oxide (ITO), SnO 2 , and ZnO.
- an amorphous material such as IDIXO (In 2 O 3 —ZnO) capable of forming a transparent conductive film may be used.
- a thin film may be formed by depositing these electrode materials by a method such as vapor deposition or sputtering, and a pattern having a desired shape may be formed by a photolithography method, or when the pattern accuracy is not so high (100 ⁇ m or more) Degree), a pattern may be formed through a mask having a desired shape when the electrode material is deposited or sputtered.
- a wet film forming method such as a printing method or a coating method can also be used.
- the transmittance be greater than 10%.
- the sheet resistance as the anode is several hundred ⁇ / sq. The following is preferred.
- the film thickness depends on the material, it is usually selected within the range of 10 to 1000 nm, preferably within the range of 10 to 200 nm.
- the second electrode 22 when the second electrode 22 is used as a cathode, a metal (referred to as an electron injecting metal), an alloy, an electrically conductive compound, and a mixture thereof having a low work function (4 eV or less) are used. Used as a substance.
- the cathode is an electrode film that functions as a cathode (cathode) that supplies electrons to the light emitting unit 21.
- the cathode can be produced by forming a thin film of these electrode materials by a method such as vapor deposition or sputtering.
- electrode materials include sodium, sodium-potassium alloy, magnesium, lithium, magnesium / copper mixture, magnesium / silver mixture, magnesium / aluminum mixture, magnesium / indium mixture, aluminum / aluminum oxide (Al 2 O 3 ) mixture. , Indium, lithium / aluminum mixtures, rare earth metals and the like.
- a mixture of an electron injecting metal and a second metal which is a stable metal having a larger work function than this for example, a magnesium / silver mixture, A magnesium / aluminum mixture, a magnesium / indium mixture, an aluminum / aluminum oxide (Al 2 O 3 ) mixture, a lithium / aluminum mixture, aluminum, or the like is preferable.
- the sheet resistance as a cathode is several hundred ⁇ / sq.
- the film thickness is usually selected from the range of 10 nm to 5 ⁇ m, preferably 50 to 200 nm.
- a transparent or semitransparent cathode can be produced by producing the conductive transparent material mentioned in the description of the anode thereon. By applying this, an element in which both the anode and the cathode are transmissive can be manufactured.
- the extraction electrode is for electrically connecting the conductive layer 12 of the transparent conductive member 10A and the external power source, and the material thereof is not particularly limited and a known material can be preferably used.
- a metal film such as a MAM electrode (Mo / Al ⁇ Nd alloy / Mo) having a three-layer structure can be used.
- the organic EL element 20 may be sealed with a sealing member (not shown) for the purpose of preventing deterioration of the light emitting unit 21 configured using an organic material or the like.
- the sealing member is a plate-like (film-like) member that covers the upper surface of the organic EL element 20, and is fixed to the resin substrate 11 side by an adhesive portion.
- the sealing member may be a sealing film.
- Such a sealing member is provided in a state in which the electrode terminal portion of the organic EL element 20 is exposed and at least the light emitting unit 21 is covered.
- the structure which provides an electrode in a sealing member and conducts the electrode terminal part of the organic EL element 20 and the electrode of a sealing member may be sufficient.
- the plate-shaped (film-shaped) sealing member examples include a glass substrate, a polymer substrate, a metal substrate, and the like, and these substrates may be used in a thin film shape.
- the glass substrate include soda lime glass, barium / strontium-containing glass, lead glass, aluminosilicate glass, borosilicate glass, barium borosilicate glass, and quartz.
- the polymer substrate include polycarbonate, acrylic, polyethylene terephthalate, polyether sulfide, and polysulfone.
- the metal substrate examples include those made of one or more metals or alloys selected from the group consisting of stainless steel, iron, copper, aluminum, magnesium, nickel, zinc, chromium, titanium, molybdenum, silicon, germanium, and tantalum.
- the element since the element can be thinned, it is preferable to use a polymer substrate or a metal substrate as a thin film as the sealing member.
- the substrate material may be processed into a concave plate shape and used as a sealing member. In this case, the substrate member described above is subjected to processing such as sandblasting and chemical etching to form a concave shape.
- the polymer substrate in the form of a film has an oxygen permeability measured by a method according to JIS K 7126-1987 of 1 ⁇ 10 ⁇ 3 ml / (m 2 ⁇ 24 h ⁇ atm) or less, and conforms to JIS K 7129-1992.
- the water vapor permeability (25 ⁇ 0.5 ° C., relative humidity (90 ⁇ 2)% RH) measured by a compliant method is preferably 1 ⁇ 10 ⁇ 3 g / (m 2 ⁇ 24 h) or less. .
- the adhesion part which fixes a sealing member to the resin base material 11 side is used as a sealing agent for sealing the organic EL element 20.
- the adhesive part include photo-curing and thermosetting adhesives having a reactive vinyl group of acrylic acid oligomers and methacrylic acid oligomers, and moisture-curing adhesives such as 2-cyanoacrylates. Can be mentioned.
- bonding portion examples include epoxy-based heat and chemical curing types (two-component mixing).
- hot-melt type polyamide, polyester, and polyolefin can be mentioned.
- a cationic curing type ultraviolet curing epoxy resin adhesive can be mentioned.
- coating of the adhesion part to the adhesion part of the sealing member and 10 A of transparent conductive members may use commercially available dispenser, and may print it like screen printing.
- the organic material which comprises an organic EL element may deteriorate with heat processing.
- the adhesive part is preferably one that can be adhesively cured from room temperature (25 ° C.) to 80 ° C. Moreover, you may disperse
- an inert gas such as nitrogen or argon, a fluorinated hydrocarbon, silicon, or the like is included in the gas phase or liquid phase of the gap. It is preferred to inject an inert liquid such as oil. A vacuum can also be used. Moreover, a hygroscopic compound can also be enclosed inside.
- hygroscopic compound examples include metal oxides (for example, sodium oxide, potassium oxide, calcium oxide, barium oxide, magnesium oxide, aluminum oxide) and sulfates (for example, sodium sulfate, calcium sulfate, magnesium sulfate, cobalt sulfate).
- metal oxides for example, sodium oxide, potassium oxide, calcium oxide, barium oxide, magnesium oxide, aluminum oxide
- sulfates for example, sodium sulfate, calcium sulfate, magnesium sulfate, cobalt sulfate.
- metal halides eg calcium chloride, magnesium chloride, cesium fluoride, tantalum fluoride, cerium bromide, magnesium bromide, barium iodide, magnesium iodide etc.
- perchloric acids eg perchloric acid Barium, magnesium perchlorate, and the like
- anhydrous salts are preferably used in sulfates, metal halides, and perchloric acids.
- the sealing film is formed on the transparent conductive member 10A in a state where the light emitting unit 21 in the organic EL element 20 is completely covered and the electrode terminal portion of the organic EL element 20 is exposed. Is provided.
- Such a sealing film is composed of an inorganic material or an organic material.
- it is made of a material having a function of suppressing entry of substances such as moisture and oxygen that cause deterioration of the light emitting unit 21 in the organic EL element 20.
- a material for example, inorganic materials such as silicon oxide, silicon dioxide, and silicon nitride are used.
- a laminated structure may be formed by using a film made of an organic material together with a film made of these inorganic materials.
- the method for forming these films is not particularly limited.
- vacuum deposition method sputtering method, reactive sputtering method, molecular beam epitaxy method, cluster ion beam method, ion plating method, plasma polymerization method, atmospheric pressure plasma
- a polymerization method a plasma CVD method, a laser CVD method, a thermal CVD method, a coating method, or the like can be used.
- a protective member such as a protective film or a protective plate may be provided to mechanically protect the organic EL element 20.
- the protective member is disposed at a position where the organic EL element 20 and the sealing member are sandwiched between the transparent conductive member 10A.
- the sealing member is a sealing film, mechanical protection for the organic EL element 20 is not sufficient, and thus such a protective member is preferably provided.
- a glass plate, a polymer plate, a thinner polymer film, a metal plate, a thinner metal film, or a polymer material film or a metal material film is applied.
- a polymer film because it is lightweight and thin.
- the transparent conductive member 10A is manufactured by the above-described manufacturing method.
- the hole injection layer, the hole transport layer, the light emitting layer, the electron transport layer, and the electron injection layer are formed in this order on the transparent conductive member 10 ⁇ / b> A to form the light emitting unit 21.
- a film forming method of each of these layers there are a spin coat method, a cast method, an ink jet method, a vapor deposition method, a printing method, etc., but from the point that a uniform film is easily obtained and pinholes are difficult to generate, etc.
- Vacuum deposition or spin coating is particularly preferred. Further, different film formation methods may be applied for each layer.
- the vapor deposition conditions vary depending on the type of compound used, but generally a boat heating temperature of 50 to 450 ° C. and a degree of vacuum of 1 ⁇ 10 ⁇ 6 to 1 ⁇ 10 ⁇ 2 Each condition is preferably selected as appropriate within the ranges of Pa, vapor deposition rate of 0.01 to 50 nm / second, substrate temperature of ⁇ 50 to 300 ° C., and layer thickness of 0.1 to 5 ⁇ m.
- the second electrode 22 is formed thereon by an appropriate film forming method such as a vapor deposition method or a sputtering method.
- the second electrode 22 has a shape in which a terminal portion is drawn from the upper side of the light emitting unit 21 to the periphery of the resin base material 11 while maintaining the insulating state with respect to the conductive layer 12 of the transparent conductive member 10A by the light emitting unit 21. Form a pattern.
- the organic EL element 20 is obtained.
- a sealing member that covers at least the light emitting unit 21 is provided in a state in which the extraction electrode and the terminal portion of the second electrode 22 in the organic EL element 20 are exposed.
- the desired organic EL element 20 is obtained on the transparent conductive member 10A.
- the resin base material 11 is taken out from the vacuum atmosphere in the middle and is different.
- a film forming method may be applied. At that time, it is necessary to consider that the work is performed in a dry inert gas atmosphere.
- Transparent conductive member Preparation of conductive layer (fine metal wire)
- a silver nanoparticle dispersion liquid (FlowMetal SR6000, manufactured by Bando Chemical Co., Ltd.) is applied as a metal ink composition in a grid pattern with a width of 50 ⁇ m and a pitch of 1 mm on the resin base material on which the primer layer is prepared.
- a pattern of the metal ink composition was formed.
- the area for forming the pattern of the metal ink composition was 30 mm ⁇ 40 mm.
- an ink jet head having an ink droplet ejection amount of 4 pl was used, and a coating speed and an ejection frequency were adjusted to print a pattern.
- a desktop robot Shotmaster-300 manufactured by Musashi Engineering
- an ink jet head manufactured by Konica Minolta
- an ink jet evaluation apparatus EB150 manufactured by Konica Minolta
- wavelength control infrared rays in which two quartz glass plates that absorb infrared rays having a wavelength of 3.5 ⁇ m or more are attached to an infrared irradiation device (ultimate heater / carbon, manufactured by Meimitsu Kogyo Co., Ltd.) and cooling air is allowed to flow between the glass plates.
- an infrared irradiation device (ultimate heater / carbon, manufactured by Meimitsu Kogyo Co., Ltd.) and cooling air is allowed to flow between the glass plates.
- the pattern of the formed metal ink composition was dried using a heater.
- Transparent conductive member Preparation of conductive layer (transparent conductive film)
- the resin base material (50 mm ⁇ 50 mm) on which the fine metal wires were produced was fixed to a substrate holder of a commercially available vacuum deposition apparatus, and the compound (1-6) was placed in a resistance heating boat made of tantalum. These substrate holder and resistance heating boat were attached to the first vacuum chamber of the vacuum evaporation apparatus. Moreover, silver (Ag) was put into the resistance heating boat made from tungsten, and it attached in the 2nd vacuum chamber.
- the resistance heating boat containing the compound (1-6) was energized and heated, and the deposition rate was 0.1 to 0.2 nm / second. Within this range, an underlayer composed of the compound (1-6) was produced on the substrate. The layer thickness of the underlayer was 50 nm.
- the substrate manufactured up to the base layer was transferred to a second vacuum chamber under vacuum.
- the resistance heating boat containing silver was heated by energization, and the deposition rate was 0.1 to 0.2 nm / sec.
- a conductive layer made of silver having a layer thickness of 8 nm was prepared, and a transparent conductive film having a laminated structure of an underlayer and a silver thin film was prepared.
- the transparent conductive member of Sample 100 was produced by the above method.
- Organic EL element Production of light emitting unit
- the crucible for vapor deposition in the vacuum vapor deposition apparatus was filled with the constituent material of each layer of the light emitting unit in the optimum amount for the production of the organic EL element.
- the evaporation crucible used was made of a resistance heating material such as molybdenum or tungsten.
- each layer of the light emitting unit As the constituent material of each layer of the light emitting unit, the following compounds ⁇ -NPD, BD-1, GD-1, RD-1, H-1, H-2 and E-1 were used.
- the pressure is reduced to 1 ⁇ 10 ⁇ 4 Pa
- the deposition crucible filled with the compound ⁇ -NPD is energized and heated, and deposited on the transparent electrode at a deposition rate of 0.1 nm / second.
- a hole injecting and transporting layer having a thickness of 40 nm was prepared.
- the compounds BD-1 and H-1 are co-evaporated at a deposition rate of 0.1 nm / second so that the concentration of the compound BD-1 is 5%, and a fluorescent light-emitting layer exhibiting a blue color with a layer thickness of 15 nm Was made.
- the compounds GD-1, RD-1 and H-2 were deposited at a rate of 0.1 nm / second so that the concentration of the compound GD-1 was 17% and the concentration of the compound RD-1 was 0.8%.
- a phosphorescent light emitting layer having a layer thickness of 15 nm and emitting yellow light was produced by co-evaporation at a speed.
- Compound E-1 was deposited at a deposition rate of 0.1 nm / second to prepare an electron transport layer having a layer thickness of 30 nm.
- LiF lithium fluoride
- the second electrode was produced in a shape in which the terminal portion was drawn to the periphery of the substrate in a state where it was insulated by the organic functional layer from the hole injection transport layer to the electron transport layer.
- a vapor deposition mask is used for the production of each layer, and a 4.5 cm ⁇ 4.5 cm region located in the center of a 5 cm ⁇ 5 cm substrate is used as a light emitting region, and a width of 0.25 cm is provided on the entire circumference of the light emitting region. A non-light emitting area was provided.
- the film was coated on the aluminum side (gas barrier layer side) so as to have a layer thickness of 20 ⁇ m and dried at 120 ° C. for 2 minutes to prepare an adhesive layer.
- a release sheet a release treatment surface of a polyethylene terephthalate film having a thickness of 38 ⁇ m was attached as a release sheet to prepare an adhesive sheet for sealing.
- the transparent conductive film was prepared and sealed in the same manner as in the sample 100, and the transparent conductive member of the sample 101 and the organic EL element were manufactured.
- the TiO 2 particles and a solvent and additives were mixed with 10% by weight ratio with respect to TiO 2 particles, while cooling at room temperature (25 ° C.), an ultrasonic dispersing machine (manufactured by SMT Co. UH- 50) was dispersed for 10 minutes under the standard conditions of a microchip step (MS-3, 3 mm ⁇ manufactured by SMT Co., Ltd.) to prepare a TiO 2 dispersion. Next, while stirring the TiO 2 dispersion at 100 rpm, the resin solution is mixed and added little by little.
- an ultrasonic dispersing machine manufactured by SMT Co. UH- 50
- the stirring speed is increased to 500 rpm and mixing is performed for 10 minutes, and then a hydrophobic PVDF 0.45 ⁇ m filter (manufactured by Whatman) ) To obtain a target dispersion liquid for forming a light scattering layer.
- the dispersion is applied onto a resin substrate by an ink jet coating method, and then simply dried (70 ° C., 2 minutes). Further, for 5 minutes under an output condition where the substrate temperature is less than 80 ° C. by wavelength control IR described later. A drying process was performed.
- the particle used for the preparation of the light scattering layer was changed to MP-6035 (manufactured by Soken Chemical Co., Ltd.), a spherical particle having a refractive index of 1.48, a particle ratio with an aspect ratio of 2 or less being 100%, a particle diameter of 450 nm, and a refractive index. Except that a light scattering layer having a particle abundance ratio of 40% on the resin base material side and a PB ratio of 45% consisting of a binder of 1.807 is produced with a thickness of 400 nm. A transparent conductive member of Sample 103 and an organic EL element were produced.
- ⁇ Production of transparent conductive member of sample 104 and organic EL element> The particles used for the production of the light scattering layer were changed to SG-TO100 (manufactured by Sukkyung AT), and the refractive index was 2.3, the proportion of particles having an aspect ratio of 2 or less was 100%, the spherical particles having a particle diameter of 100 nm, and the refractive index. Except that a light scattering layer having a particle base ratio of 75% on the resin base material side and a PB ratio of 45% is formed with a thickness of 300 nm consisting of a binder of 1.807, A transparent conductive member of sample 104 and an organic EL element were produced.
- the particles used for the preparation of the light scattering layer were changed to B-30 (manufactured by Sakai Chemical Industry Co., Ltd.), spherical particles having a refractive index of 2.0, an aspect ratio of 2 or less, a particle ratio of 15%, a particle diameter of 300 nm, and refraction Except that a light scattering layer having a particle base ratio of 60% on the resin base material side and a PB ratio of 20% made of a binder having a ratio of 1.807 was produced with a thickness of 500 nm, the same method as that of the sample 102 described above was used. A transparent conductive member of sample 106 and an organic EL element were produced.
- the sample 107 was prepared in the same manner as the sample 104 described above except that a light scattering layer having a particle abundance ratio of 80% on the resin substrate side and a PB ratio of 30% was prepared with a thickness of 260 nm.
- a transparent conductive member and an organic EL element were produced.
- ⁇ Preparation of transparent conductive member of sample 108 and organic EL element> The particles used for the preparation of the light scattering layer were changed to SG-TO200 (manufactured by Sukkyung AT), and the refractive index was 2.3, the proportion of particles having an aspect ratio of 2 or less was 100%, the spherical particles having a particle diameter of 210 nm, and the refractive index Except that a light scattering layer having a particle abundance ratio of 55% on the resin base material side and a PB ratio of 30% is formed with a thickness of 230 nm, which is made of a binder of 1.807, A transparent conductive member of Sample 108 and an organic EL element were produced.
- ⁇ Preparation of transparent conductive member of sample 110 and organic EL element> The particles used for the preparation of the light scattering layer were changed to R-42 (manufactured by Sakai Chemical Industry Co., Ltd.), spherical particles having a refractive index of 2.3, an aspect ratio of 2 or less, a particle ratio of 85%, a particle diameter of 290 nm, Except that a light scattering layer having a particle base ratio of 65% on the resin base material side and a PB ratio of 20% made of a binder having a rate of 1.807 was produced with a thickness of 500 nm, the same method as that of the sample 102 described above was used. A transparent conductive member of Sample 110 and an organic EL element were produced.
- the solid content ratio of the solution particles to be prepared and the resin is 20% by volume (particles) / 80% by volume (resin).
- the transparent conductive member of Sample 111 and the organic EL element were prepared in the same manner as Sample 110 described above, except that the scattering layer was formed to a thickness of 500 nm and a transparent conductive film made of ITO was prepared by the following method. Produced.
- ITO transparent conductive film
- the base material prepared up to the fine metal wire was transferred to a commercially available parallel plate sputtering apparatus equipped with an ITO target, and after reducing the pressure in the chamber of the sputtering apparatus to 5 ⁇ 10 ⁇ 3 Pa, flowing nitrogen gas and oxygen gas, An ITO transparent conductive film having a film thickness of 150 nm and a film thickness of 10 nm / second was produced by discharging at a DC output of 500 W.
- the solid content ratio of the solution particles to be prepared and the resin is 5% by volume (particles) / 95% by volume (resin), the particle abundance ratio on the resin substrate side is 70%, and the PB ratio is 5%.
- the transparent conductive member of Sample 112 and the organic EL element were the same as Sample 107 described above except that the light scattering layer was formed to a thickness of 500 nm and a transparent conductive film made of IZO was prepared by the following method. Was made.
- IZO transparent conductive film
- the sample 113 was prepared in the same manner as the sample 112 described above except that a light scattering layer having a particle abundance ratio of 65% on the resin substrate side and a PB ratio of 10% was formed with a thickness of 500 nm.
- a transparent conductive member and an organic EL element were produced.
- the sample 114 was prepared in the same manner as the sample 112 described above except that a light scattering layer having a particle abundance ratio of 70% on the resin base material side and a PB ratio of 20% was formed with a thickness of 600 nm. A transparent conductive member and an organic EL element were produced.
- the sample 115 was prepared in the same manner as the sample 114 described above, except that a light scattering layer having a particle abundance ratio of 85% on the resin substrate side and a PB ratio of 20% was formed with a thickness of 800 nm. A transparent conductive member and an organic EL element were produced.
- the sample 116 was prepared in the same manner as the above-described sample 114 except that a light scattering layer having a particle abundance ratio of 95% on the resin substrate side and a PB ratio of 20% was formed with a thickness of 1200 nm.
- a transparent conductive member and an organic EL element were produced.
- ⁇ Preparation of transparent conductive member of sample 117 and organic EL element> The particles used for the production of the light scattering layer were changed to BT-HPS500 (manufactured by Toagosei Co., Ltd.), spherical particles having a refractive index of 2.42, an aspect ratio of 2 or less, a particle ratio of 90%, a particle diameter of 400 nm, and a refractive index. Except that a light scattering layer having a particle abundance ratio of 60% on the resin substrate side and a PB ratio of 20% is formed with a thickness of 700 nm, which is composed of a binder of 1.807, A transparent conductive member of Sample 117 and an organic EL element were produced.
- the transparent conductive member of Sample 118 is the same as Sample 117 described above, except that the binder used for the production of the light scattering layer is changed to 230 La (refractive index 1.5, organic-inorganic hybrid resin, manufactured by Rasa Industrial Co., Ltd.). And the organic EL element was produced.
- a light scattering layer having a particle abundance ratio of 65% on the resin substrate side and a PB ratio of 20 is produced with a thickness of 500 nm, and an anti-ablation layer is formed on the light scattering layer by the following method.
- a transparent conductive member of Sample 119 and an organic EL element were prepared in the same manner as Sample 114 described above except that the conductive layer was formed on the anti-ablation layer.
- the prepared solution was applied to the light scattering layer with a thickness of 5 nm by an ink-jet coating method, followed by simple drying (70 ° C., 3 minutes), and further using a dryer at 50 ° C. 48 The drying process was performed on condition of time.
- a catalyst-free perhydropolysilazane 20% by mass dibutyl ether solution (Aquamica NN120-20, manufactured by AZ Electronic Materials) and 5% by mass of an amine catalyst are contained.
- Perhydropolysilazane 20% by mass dibutyl ether solution (Aquamica NAX120-20, manufactured by AZ Electronic Materials) was mixed, and the amine catalyst was adjusted to 1% by mass after solid content, and further diluted with dibutyl ether. A 5 mass% dibutyl ether solution was prepared.
- the solution prepared on the light scattering layer was applied so that the dry layer thickness was 5 nm. Furthermore, the coating film was subjected to a drying treatment under the conditions of a drying temperature of 80 ° C., a drying time of 300 seconds, and a dew point of 5 ° C. in the drying atmosphere.
- the substrate was cooled to a substrate temperature of 25 ° C., and the coating film was subjected to a modification treatment by irradiation with vacuum ultraviolet rays in a vacuum ultraviolet irradiation apparatus.
- a light source of the vacuum ultraviolet irradiation device an Xe excimer lamp having a double tube structure for irradiating vacuum ultraviolet rays having a wavelength of 172 nm was used.
- the substrate on which the gas barrier layer was formed was dried under the same drying conditions as described above. After drying, a second modification treatment was performed to form an anti-ablation layer having a thickness of 5 nm after drying. In each of the coating, drying, and modification processes, uniform tension was applied to the substrate by a tension control mechanism.
- the base material fabricated up to the light scattering layer was mounted in the chamber of a magnetron sputtering apparatus (SPF-730H, manufactured by Anerva). Next, the pressure in the chamber of the magnetron sputtering apparatus was reduced to an ultimate vacuum of 3.0 ⁇ 10 ⁇ 4 Pa using an oil rotary pump and a cryopump. Si is used as a target, argon gas 7 sccm and nitrogen gas 26 sccm are introduced, high-frequency power with a frequency of 13.56 MHz (input power 1.2 kW) is applied, a film-forming pressure is 0.4 Pa, and a film thickness is 300 nm. A silicon nitride film was formed. As a result, an anti-ablation layer made of silicon nitride (SiN) was produced with a thickness of 5 nm.
- SiN silicon nitride
- the particle used for the production of the light scattering layer was changed to MP-6035 (manufactured by Soken Chemical Co., Ltd.), and the binder was changed to ORGATIX PC-250 (manufactured by Matsumoto Fine Chemical Co., Ltd.), with a refractive index of 1.48 and an aspect ratio.
- a light scattering layer having a particle abundance ratio of 60% on the resin substrate side and a PB ratio of 20 comprising a spherical particle having a particle ratio of 2 or less of 100% and a particle diameter of 450 nm and a binder having a refractive index of 1.91 is 500 nm.
- a transparent conductive member and an organic EL element of Sample 122 were manufactured by the same method as Sample 121 described above except that the thickness was manufactured.
- Table 1 below shows the main components of the transparent conductive members of Samples 101 to 124.
- Luminescence efficiency Total luminous flux
- the luminous flux at a constant current was measured using an integrating sphere. Specifically, the total luminous flux was measured at a constant current density of 20 A / m 2 .
- the luminous efficiency of each sample was obtained as a relative value with the luminous efficiency of the sample 100 as 1.00, and a value of 1.2 times or more was accepted.
- Table 2 shows the evaluation results of the transparent conductive members of Sample 100 to Sample 124 and the organic EL element.
- the transparent conductive member of the sample 101 using rod-shaped particles (65% of particles having an aspect ratio of 2 or less) containing only 65% of particles having an aspect ratio of 2 or less in the light scattering layer is the light scattering layer.
- the evaluation of ablation is poor compared to the sample 100 that does not include the sample 100 and the samples 104 to 124 that use spherical particles containing 80% or more of particles having an aspect ratio of 2 or less in the light scattering layer.
- the organic EL element of the sample 101 has a large voltage increase and a large occurrence of dark spots as compared with the sample 100 and the samples 104 to 124.
- the uneven distribution of particles on the base material side of the light diffusion layer is 55%, but since the spherical particles having an aspect ratio of 2 or less are as small as 65%, voltage increase and abnormal light emission occur. It has become easier.
- sample 101 uses rod-like particles, the surface of the light scattering layer has poor flatness.
- the particles are not unevenly distributed on the base material side of the light diffusion layer, and many particles are also arranged on the conductive layer side of the light diffusion layer.
- the particle abundance ratio on the base material side of the light diffusion layer is small and the flatness of the surface of the light scattering layer is low, it is caused by the occurrence of ablation when firing fine metal wires and the low flatness. Occurrence of device failure is likely to occur.
- the sample 103 in which the particle diameter of the particles used in the light scattering layer is larger than the thickness of the light scattering layer has a poor ablation evaluation compared to the sample 100 and the samples 104 to 124.
- the organic EL element of the sample 103 has a larger voltage rise and dark spots than the sample 100 and the samples 104 to 124 in which the particle diameter of the particles used in the light scattering layer is smaller than the thickness of the light scattering layer. Occurrence is great.
- Sample 103 has a particle diameter larger than the thickness of the light scattering layer, so that the particles protrude from the surface of the light scattering layer, and the flatness of the surface of the light scattering layer is poor. Further, since the particle diameter of the particles is larger than the thickness of the light scattering layer, the volume ratio of the particles on the conductive layer side of the light diffusion layer is increased, and the particle abundance ratio on the resin substrate side of the light diffusion layer is as small as 40%. Become. Thus, in the light-scattering layer, if the particle abundance ratio on the resin substrate side is low and the flatness of the surface is low, an element resulting from the occurrence of ablation when firing fine metal wires and the low flatness Defects are likely to occur.
- the particles can be unevenly distributed on the substrate side by using spherical particles having a particle diameter smaller than the thickness of the light scattering layer and containing 80% or more of particles having an aspect ratio of 2 or less.
- the flatness of the surface of the light scattering layer can be improved, and the occurrence of ablation can be suppressed. Further, by increasing the flatness of the surface of the light scattering layer, it is difficult to cause device defects due to low flatness.
- the sample 109 using the light scattering layer with a thickness of 300 nm and the particle size of 210 nm emits light more than the sample 104 and the sample 107 using the light scattering layer with a thickness of 300 nm and the particle size of 100 nm.
- Efficiency has improved. Therefore, the light emission efficiency of the organic EL element is improved by using particles having a particle diameter of 200 nm or more.
- the thickness of a light-scattering layer shall be 250 nm or more. preferable.
- the light emission efficiency of the organic EL element tends to be improved by setting the PB ratio to 5 or more. It was. Furthermore, by increasing the thickness of the light scattering layer and increasing the degree of uneven distribution, the light emission efficiency of the organic EL element tends to be improved. Therefore, in the light scattering layer, it is preferable to set the PB ratio to 5 or more and increase the thickness to increase the degree of uneven distribution of particles.
- the sample 122 whose particle refractive index is lower than the refractive index of the binder has high luminous efficiency like the samples 119 to 121.
- the light scattering layer may have a high refractive index of either the particle or the binder as long as there is a difference in refractive index between the particle and the binder, not only a combination of a high refractive index particle and a low refractive index binder, Low refractive index particles and high refractive index binders can also be combined.
- the sample 117 having a refractive index difference of 0.613 has improved luminous efficiency compared to the sample 110 having the same PB ratio of 20 and a refractive index difference of 0.493. For this reason, the luminous efficiency of an organic EL element is easy to improve by enlarging the refractive index difference of particle
- the sample 118 having a large refractive index difference of 0.92 has lower luminous efficiency than the sample 117 having a refractive index difference of 0.613.
- the upper limit of the refractive index difference between the particles and the binder is about 1. Further, the refractive index of the binder is preferably 1.5 or more.
- the type of the conductive material such as metal or metal oxide is not particularly limited as the transparent conductive film, and various highly transparent conductive materials can be used. Further, the thickness of the transparent conductive member is not particularly limited as long as the transparency of the transparent conductive film does not decrease and the light emission efficiency of the organic EL element does not decrease.
- SYMBOLS 10,10A Transparent conductive member, 11 ... Resin base material, 12 ... Conductive layer, 13 ... Metal fine wire, 14 ... Transparent conductive film, 15 ... Light scattering layer, 16. .... Particles, 17 ... Binder, 18 ... Ablation prevention layer, 20 ... Organic EL element, 21 ... Light emitting unit, 22 ... Second electrode
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Abstract
Description
また、透明導電部材を適用した有機EL素子等の発光効率を高めるために、基材と導電層との間に、光散乱粒子とバインダとからなる光散乱層を設ける構成が提案されている(例えば、特許文献3参照)。この構成では、光散乱層を有することにより、導電層と基板との界面での反射が低減し、光取り出し効率が向上する。
また、本発明の有機エレクトロルミネッセンス素子は、上記透明導電部材上に、発光ユニットと第2電極とを備える。
なお、説明は以下の順序で行う。
1.透明導電部材
2.透明導電部材の変形例
3.透明導電部材の製造方法
4.有機エレクトロルミネッセンス素子
5.有機エレクトロルミネッセンス素子の製造方法
以下、透明導電部材の実施の形態について説明する。
図1に、本実施の形態の透明導電部材の概略構成を示す。図1に示す透明導電部材10は、樹脂基材11と、樹脂基材11上に設けられた光散乱層15と、光散乱層15上に設けられた導電層12とを備える。光散乱層15は、粒子16とバインダ17とを含んで構成されている。導電層12は、光散乱層15上に形成された金属細線13と、この金属細線13上を覆って設けられた透明導電膜14とから構成されている。
透明導電部材10において、光散乱層15に含まれる粒子16には、アスペクト比が2以下の球状粒子が80%以上含まれる。そして、光散乱層15の厚さは、粒子16の粒子径よりも大きい。このように、粒子16としてアスペクト比2以下の球状粒子を80%以上含み、光散乱層15の厚さが粒子16の粒子径よりも大きいことにより、光散乱層15において粒子16が光散乱層15の樹脂基材11側の領域に偏在されやすくなる。粒子16を樹脂基材11側の領域に偏在させる方法としては、例えば、液濃度を通常の塗布濃度より希釈し、希釈分だけ厚く塗布する手段を用いることができる。そうすることにより、塗布直後から塗膜の乾燥が終了するまでの時間を調節することができ、粒子16が樹脂基材11側に沈み込みやすくなるため、粒子16の樹脂基材11側の粒子16の存在率(偏在率)を調整することができる。
バインダ17は、波長633nmの光における屈折率nbが1.50以上2.00未満であることが好ましい。バインダ17の屈折率nbとは、単独の素材で形成されている場合は、単独の素材の屈折率であり、混合系の場合は、各々の素材固有の屈折率に混合比率を乗じた合算値により算出される計算屈折率である。
光散乱層15の層厚は、散乱を生じるための光路長を確保するためにある程度厚い必要があるが、一方で吸収によるエネルギーロスを生じない程度に薄い必要がある。このため、光散乱層15の厚さは、250nm以上1000nm以下であることが好ましい。
上述のように、光散乱層15には粒子16として、アスペクト比が2以下の球状粒子が80%以上含まれる。このアスペクト比が2以下の球状粒子は、平均粒子径が200~500nmであることが好ましく、200~450nmであることがより好ましく、250~400nm未満であることがさらに好ましい。
ここでいうアスペクト比とは、粒子16の長軸長と短軸長の比のことである。例えば、走査型電子顕微鏡(SEM)でランダムに粒子16を撮影して画像を得て、その画像から粒子16の長軸長と短軸長を求めて計算することができる。粒子を倍率10万倍で撮影し、その画像から粒子100個分のアスペクト比を確認し、比率を求める。
粒子の平均粒子径は、電子顕微鏡写真の画像処理により測定することができる。粒子を倍率10万倍で撮影し、その画像から粒子の長軸の長さを測定する。粒子100個分の平均をとったものを粒子の平均粒子径とする。
光散乱層15のバインダ17としては、粒子16の屈折率npがバインダ17の屈折率nbよりも小さい構成、及び、粒子16の屈折率npがバインダ17の屈折率nbよりも大きい構成のいずれにおいても、公知のバインダを特に制限なく使用できる。また、バインダは、複数種類を混合して使用することもできる。
これは、低屈折バインダの場合、導電層12側から来た光が侵入角度によっては低屈折率バインダ内に進むことができず、反射されてしまうためである。
具体的には、Si-O-Si結合を有するポリシロキサン(ポリシルセスキオキサンを含む)、Si-N-Si結合を有するポリシラザン、Si-O-Si結合とSi-N-Si結合の両方を含むポリシロキサザン等を挙げることができる。これらは、2種以上を混合して使用することができる。
光散乱層15で用いられるポリシロキサンとしては、一般構造単位としてのR3SiO1/2、R2SiO、RSiO3/2及びSiO2を含む。ここで、Rは、水素原子、1~20の炭素原子を含むアルキル基例えば、メチル、エチル、プロピル等、アリール基例えば、フェニル等、及び不飽和アルキル基例えば、ビニル等からなる群より独立して選択される。特定のポリシロキサン基の例としては、PhSiO3/2、MeSiO3/2、HSiO3/2、MePhSiO、Ph2SiO、PhViSiO、ViSiO3/2、MeHSiO、MeViSiO、Me2SiO、Me3SiO1/2等が挙げられる。また、ポリシロキサンの混合物やコポリマーも使用可能である。なお、Viはビニル基を表す。
光散乱層15においては、上述のポリシロキサンの中でもポリシルセスキオキサンを用いることが好ましい。ポリシルセスキオキサンは、シルセスキオキサンを構造単位に含む化合物である。「シルセスキオキサン」とは、RSiO3/2で表される化合物であり、通常、RSiX3で表され。Rは、水素原子、アルキル基、アルケニル基、アリール基、アラアルキル基(アラルキル基ともいう)等であり、Xは、ハロゲン、アルコキシ基等である。
ポリシルセスキオキサンの分子配列の形状としては、代表的には無定形構造、ラダー状構造、籠型構造、籠型構造からケイ素原子が一原子欠けた構造や籠型構造のケイ素-酸素結合が一部切断された部分開裂構造体等が知られている。
光散乱層15で用いられるポリシラザンとは、ケイ素-窒素結合を持つポリマーで、Si-N、Si-H、N-H等からなるSiO2、Si3N4及び両方の中間固溶体SiOxNy(x=0.1~1.9、y=0.1~1.3)等の無機前駆体ポリマーである。
例えば、電子線硬化の場合には、コックロフワルトン型、バンデグラフ型、共振変圧型、絶縁コア変圧器型、直線型、ダイナミトロン型、高周波型等の各種電子線加速器から放出される10~1000keV、好ましくは30~300keVのエネルギーを有する電子線等が使用される。紫外線硬化の場合には、超高圧水銀灯、高圧水銀灯、低圧水銀灯、カーボンアーク、キセノンアーク、メタルハライドランプ等の光線から発する紫外線等が使用できる。
紫外線照射装置としては、例えば、100~230nmの範囲内で真空紫外線を発する希ガスエキシマランプが挙げられる。
キセノン(Xe)、クリプトン(Kr)、アルゴン(Ar)、ネオン(Ne)等の希ガスの原子は、化学的に結合して分子を作らないため、不活性ガスと呼ばれる。しかし、放電等によりエネルギーを得た希ガスの原子(励起原子)は、他の原子と結合して分子を作ることができる。
例えば、希ガスがXe(キセノン)の場合には、下記反応式で示されるように、励起されたエキシマ分子であるXe2 *が基底状態に遷移するときに、172nmのエキシマ光を発光する。
Xe*+2Xe→Xe2 *+Xe
Xe2 *→Xe+Xe+hν(172nm)
誘電体バリア放電ランプの構成としては、電極間に誘電体を介して放電を起こすものであり、一般的には、誘電体からなる放電容器とその外部とに少なくとも一方の電極が配置されていればよい。誘電体バリア放電ランプとして、例えば、石英ガラスで構成された太い管と細い管とからなる二重円筒状の放電容器中にキセノン等の希ガスが封入され、該放電容器の外部に網状の第1の電極を設け、内管の内側に他の電極を設けたものがある。誘電体バリア放電ランプは、電極間に高周波電圧等を加えることによって放電容器内部に誘電体バリア放電を発生させ、該放電により生成されたキセノン等のエキシマ分子が解離する際にエキシマ光を発生させる。
透明導電部材10において、樹脂基材11の一方の面上において、金属を含む細線である金属細線13でパターンが形成されている。金属細線13は、樹脂基材11の一方の面上において開口部を有する所定のパターンに形成されている。樹脂基材11上で金属細線13が形成されていない部分が開口部(透光性窓部)となる。金属細線13の細線パターンの形状は特に制限はない。例えば、ストライプ状のパターンや、格子状のパターン、又は、ランダムな網目状等とすることができる。金属細線13は、光散乱層15に直に接するように形成されている。また、金属細線13と光散乱層15との間には他の層が形成されていてもよい。
導電層12を構成する金属細線13は、金属を主成分とし、導電性を得ることができる程度の金属の含有比率で形成されている。金属細線中の金属の比率は、好ましくは50質量%以上である。
ストライプ状、格子状のパターンにおいて、金属細線の間隔は、0.5~4mmの範囲内であることが好ましい。
金属細線13の形成は、金属又は金属の形成材料が配合された金属インク組成物を調製し、塗布した後、乾燥処理や焼成処理等の後処理を適宜選択して行うことが好ましい。
また、上記有機π接合配位子としては、金属ナノ粒子への配位や、分散媒中での分散性を向上させるために、置換基としてアミノ基、アルキルアミノ基、メルカプト基、ヒドロキシル基、カルボキシル基、ホスフィン基、ホスフォン酸基、スルフォン酸基、ハロゲン基、セレノール基、スルフィド基、セレノエーテル基、アミド基、イミド基、シアノ基、ニトロ基、及び、これらの塩から選ばれる少なくとも1種の置換基を有することが好ましい。
OTAN: 2,3,11,12,20,21,29,30-オクタキス[(2-N,N-ジメチルアミノエチル)チオ]ナフタロシアニン
OTAP: 2,3,9,10,16,17,23,24-オクタキス[(2-N,N-ジメチルアミノエチル)チオ]フタロシアニン
OCAN:2,3,11,12,20,21,29,30-ナフタロシアニンオクタカルボン酸
具体的には特開2013-142173公報、特開2012-162767号公報、特開2014-139343号公報、特許第5606439号などに記載の金属ナノ粒子分散液が例として挙げられる。
導電層12を構成する透明導電膜14は、金属細線13の表面を覆うように光散乱層15の面上に設けられている。透明導電膜14は、透明導電部材10において電気を導通させるための導電性材料を含む層である。透明導電膜14としては、例えば、Au、Ag、Pt、Cu、Rh、Pd、Al、Cr等の金属薄膜や、In2O3、CdO、CdIn2O4、Cd2SnO4、TiO2、SnO2、ZnO、ITO(インジウム・錫酸化物)、IZO(インジウム・亜鉛酸化物)、IGO(インジウム・ガリウム酸化物)、IWZO(インジウム・タングステン・亜鉛酸化物)、AZO(Alドープ酸化亜鉛)、GZO(Gaドープ酸化亜鉛)、ATO(アンチモン・スズ酸化物)、FTO(Fドープ酸化スズ)、TiN、ZrN、HfN、TiOx、VOx、CuI、InN、GaN、CuAlO2、CuGaO2、SrCu2O2、LaB6、RuO2等の導電性無機化合物層が挙げられる。これら化合物は結晶性でも非結晶性でもよい。また、IDIXO(In2O3-ZnO)等の非晶質で透明導電部材10を作製可能な材料を用いてもよい。また、導電性ポリマーを使用してもよく、例えばポリアセチレン、ポリ(p-フェニレンビニレン)、ポリピロール、ポリチオフェン、ポリアニリン、ポリ(p-フェニレンスルフィド)等が挙げられる。透明導電膜14には、これらの導電性材料が1種のみ含まれてもよく、2種以上含まれてもよい。
透明導電膜14の形成方法としては、特に制限はなく、従来公知の方法が利用できる。この透明導電膜14の形成方法としては、例えば、ドライプロセスによるCVD法、真空蒸着法、イオンプレーティング法、スパッタリング法等が利用できる。
透明導電膜14は、透明導電部材10の導電層12を構成する観点から、シート抵抗が10000Ω/sq.以下であることが好ましく、2000Ω/sq.以下であることがより好ましい。
樹脂基材11は、高い光透過性を有していれば、特に制限はない。例えば樹脂基板、樹脂フィルム等が好適に挙げられるが、生産性の観点や軽量性と柔軟性といった性能の観点から透明樹脂フィルムを用いることが好ましい。
また、樹脂基材11は、未延伸フィルムでもよいし、延伸フィルムでもよい。
次に、上述の実施形態において説明した透明導電部材の変形例について説明する。
図2に透明導電部材の変形例の概略構成を示す。図2に示す透明導電部材10Aは、樹脂基材11と、樹脂基材11上に設けられた光散乱層15と、光散乱層15上に設けられたアブレーション防止層18と、アブレーション防止層18上に設けられた導電層12とを備える。この構成の透明導電部材10Aは、アブレーション防止層18を有することのみが上述の実施形態の透明導電部材と異なり、他の構成については上述の実施形態の透明導電部材と同様の構成である。従って、以下の説明では、アブレーション防止層18に係わる構成のみを説明し、他の構成は説明を省略する。
アブレーション防止層18は、金属細線13を形成するための金属インク組成物を塗布及びパターニングする際に、金属インク組成物中の溶媒等の光散乱層15への浸透等を抑制するための層である。金属インク組成物中の溶媒等が光散乱層15へ浸透すると、金属細線形成時の加熱により、溶媒が気化し、金属細線のアブレーションを起こす。このため、アブレーション防止層18は、溶剤バリア性が高い層であれば、特に構成は限定されない。また、金属インク組成物中の溶媒が光散乱層15内に接触しないように、ピンホール等の破綻が無い、均一な膜であることが好ましい。また、アブレーション防止層18は、溶剤バリア性を備えていればよいため、平坦性やその他の機能を有している必要はない。このため、アブレーション防止層は、溶剤バリア性を実現するためだけの十分な厚さを有していればよく、例えば、10nm以上100nm以下であることが好ましい。
次に、上述の構成の透明導電部材10の製造方法を説明する。
透明導電部材10の作製においては、まず樹脂基材11を準備する。樹脂基材11には、必要に応じて予めガスバリア層が形成されたガスバリア性フィルムを樹脂基材11として準備してもよい。さらに、必要に応じて、樹脂基材11上に粒子含有層を形成する、或いは、予め粒子含有層が形成された樹脂基材11を準備する。
次に、準備した樹脂基材11上に、光散乱層15を形成する。光散乱層15の形成は、溶媒にバインダ17と、粒子16とを分散することで光散乱層形成用分散液を作製し、この分散液を樹脂基材上に塗布することで形成する。
光散乱層15を所定のパターンに形成する場合には、グラビア印刷法、フレキソ印刷法、オフセット印刷法、スクリーン印刷法、インクジェット印刷法を用いることが好ましい。
次に、光散乱層15上にアブレーション防止層18を形成する。なお、アブレーション防止層18は必要に応じて形成すればよい。アブレーション防止層18を形成する方法は、特に限定されない。例えば、ポリエチレンやポリプロピレン等の樹脂膜を形成する場合には、これらの樹脂を含む液状組成物を調製し、この液状組成物を光散乱層15上に塗布した後、乾燥してアブレーション防止層18を形成することができる。また、前駆体を含む液状組成物を調製した後に、この液状組成物を光散乱層15上に塗布し、加熱又はエネルギー線照射等によって反応させてアブレーション防止層18を形成することができる。
次に、光散乱層15上、又は、アブレーション防止層18上に金属細線13を形成する。金属細線13の形成方法としては、特に制限はなく、従来公知の方法が利用できる。この従来公知の金属細線13の形成方法としては、例えば、金属インク組成物を用いた、フォトリソ法、塗布法、印刷法を応用した方法等を利用できる。
次に、塗布された金属ナノ粒子や金属コロイドを含有する組成物の乾燥処理を行なう。乾燥処理は、公知の乾燥法を用いて行うことができる。乾燥法としては、例えば、空冷乾燥、温風等を用いた対流伝熱乾燥、赤外線等を用いた輻射電熱乾燥、ホットプレート等を用いた伝導伝熱乾燥、真空乾燥、マイクロ波を用いた内部発熱乾燥、IPA蒸気乾燥、マランゴニ乾燥、ロタゴニ乾燥、凍結乾燥等を用いることができる。
次に、乾燥させた金属インク組成物のパターンの焼成処理を行なう。なお、金属インク組成物に含まれる金属組成物の種類(例えば、上述のπ接合有機配位子を有する銀コロイド等)によっては、乾燥処理で十分導電性が発現するため、焼成工程を行わなくてもよい。
金属インク組成物のパターンの焼成は、フラッシュランプを用いた光照射(フラッシュ焼成)により行なうことが、透明導電部材10の導電性の向上のため好ましい。フラッシュ焼成で用いられるフラッシュランプの放電管としては、キセノン、ヘリウム、ネオン、アルゴン等の放電管を用いることができるが、キセノンランプを用いることが好ましい。
次に、金属細線13を覆って、導電層12の形成領域の全面に透明導電膜14を形成する。透明導電膜14は、上述の金属酸化物のスパッタリングターゲットを用いたスパッタリング法やイオンプレーティング法等によって形成することができる。
次に、上述の透明導電部材を用いた有機エレクトロルミネッセンス素子(有機EL素子)の実施形態について説明する。本実施形態の有機EL素子は、上述の透明導電部材の導電層を第1電極(透明電極)とし、この第1電極上に、発光ユニットと第2電極(対向電極)とが設けられた構成である。このため、以下の有機EL素子の説明では、上述の透明導電部材と同じ構成については、詳細な説明を省略する。
本実施形態の有機EL素子の構成を図3に示す。図3に示す有機EL素子20は、透明導電部材10Aの導電層12(第1電極)と、第2電極22とを備え、この電極間に有機機能層として発光ユニット21が設けられている。透明導電部材10Aは、上述の図2と同様の構成である。
[陽極/第1発光ユニット/中間コネクタ層/第2発光ユニット/中間コネクタ層/第3発光ユニット/陰極]
タンデム型有機EL素子の具体例としては、例えば、米国特許第6337492号明細書、米国特許第7420203号明細書、米国特許第7473923号明細書、米国特許第6872472号明細書、米国特許第6107734号明細書、米国特許第6337492号明細書、国際公開第2005/009087号、特開2006-228712号公報、特開2006-24791号公報、特開2006-49393号公報、特開2006-49394号公報、特開2006-49396号公報、特開2011-96679号公報、特開2005-340187号公報、特許第4711424号公報、特許第3496681号公報、特許第3884564号公報、特許第4213169号公報、特開2010-192719号公報、特開2009-076929号公報、特開2008-078414号公報、特開2007-059848号公報、特開2003-272860号公報、特開2003-045676号公報、国際公開第2005/094130号等に記載の素子構成や構成材料等が挙げられる。
有機EL素子20は、透明導電部材10Aの導電層12からなる第1電極と第2電極22との一対の電極に挟持された、発光ユニット21を有する。透明導電部材10Aの導電層12(第1電極)と第2電極22とは、いずれか一方が有機EL素子20の陽極となり、他方が陰極となる。
有機EL素子20において、第2電極22を陽極として用いる場合には、仕事関数の大きい(4eV以上)金属、合金、電気伝導性化合物及びこれらの混合物を電極物質とするものが好ましく用いられる。陽極を構成可能な電極物質の具体例としては、Au、Ag等の金属、CuI、酸化インジウムスズ(Indium Tin Oxide:ITO)、SnO2、ZnO等の導電性透明材料が挙げられる。また、IDIXO(In2O3-ZnO)等非晶質で透明導電膜を作製可能な材料を用いてもよい。
陰極は、発光ユニット21に電子を供給する陰極(カソード)として機能する電極膜である。陰極は、これらの電極物質を蒸着やスパッタリング等の方法により薄膜を形成することにより、作製することができる。
取り出し電極は、透明導電部材10Aの導電層12と外部電源とを電気的に接続するものであって、その材料としては特に限定されるものではなく公知の素材を好適に使用できるが、例えば、3層構造からなるMAM電極(Mo/Al・Nd合金/Mo)等の金属膜を用いることができる。
有機EL素子20は、有機材料等を用いて構成された発光ユニット21の劣化を防止することを目的として、図示しない封止部材で封止されていてもよい。封止部材は、有機EL素子20の上面を覆う板状(フィルム状)の部材であって、接着部によって樹脂基材11側に固定される。また、封止部材は、封止膜であってもよい。このような封止部材は、有機EL素子20の電極端子部分を露出させ、少なくとも発光ユニット21を覆う状態で設けられている。また、封止部材に電極を設け、有機EL素子20の電極端子部分と、封止部材の電極とを導通させる構成でもよい。
特に、素子を薄膜化できるということから、封止部材としてポリマー基板や金属基板を薄型のフィルム状にして使用することが好ましい。
また、基板材料は、凹板状に加工して封止部材として用いてもよい。この場合、上述した基板部材に対して、サンドブラスト加工、化学エッチング加工等の加工が施され、凹状が形成される。
なお、有機EL素子を構成する有機材料は、熱処理により劣化する場合がある。このため、接着部は、室温(25℃)から80℃までに接着硬化できるものが好ましい。また、接着部中に乾燥剤を分散させておいてもよい。
また、有機EL素子20を機械的に保護するために、保護膜又は保護板等の保護部材(図示省略)を設けてもよい。保護部材は、有機EL素子20及び封止部材を、透明導電部材10Aとで挟む位置に配置される。特に封止部材が封止膜である場合には、有機EL素子20に対する機械的な保護が十分ではないため、このような保護部材を設けることが好ましい。
次に、図3に示す有機EL素子20の製造方法の一例を説明する。
まず、上述の製造方法により透明導電部材10Aを作製する。
次に、透明導電部材10A上に、正孔注入層、正孔輸送層、発光層、電子輸送層、電子注入層の順に成膜し、発光ユニット21を形成する。これらの各層の成膜方法としては、スピンコート法、キャスト法、インクジェット法、蒸着法、印刷法等があるが、均質な膜が得られやすく、かつピンホールが生成しにくい等の点から、真空蒸着法又はスピンコート法が特に好ましい。さらに、層ごとに異なる成膜法を適用してもよい。これらの各層の成膜に蒸着法を採用する場合、その蒸着条件は使用する化合物の種類等により異なるが、一般にボート加熱温度50~450℃、真空度1×10-6~1×10-2Pa、蒸着速度0.01~50nm/秒、基板温度-50~300℃、層厚0.1~5μmの範囲内で、各条件を適宜選択することが好ましい。
[透明導電部材:樹脂基材]
(基材準備)
樹脂基材として、厚さ100μmのポリエチレンテレフタレート(PET)フィルム(東レ社製のルミラー(登録商標)U48)を準備した。
樹脂基材の易接着面に、JSR株式会社製 UV硬化型有機/無機ハイブリッドハードコート材 OPSTAR Z7501を、塗布、乾燥後の層厚が4μmになるようにワイヤーバーで塗布した後、乾燥条件:80℃、3分で乾燥後、空気雰囲気下、高圧水銀ランプを使用し、硬化条件:1.0J/cm2で硬化を行い、プライマー層を作製した。
プライマー層を作製した樹脂基材上に、金属インク組成物として銀ナノ粒子分散液(FlowMetal SR6000、バンドー化学株式会社製)を、インクジェット印刷法を用いて、50μm幅、1mmピッチで格子状に塗布して金属インク組成物のパターンを形成した。金属インク組成物のパターンを形成するエリアは30mm×40mmとした。インクジェット印刷法としては、インク液滴の射出量が4plのインクジェットヘッドを使用し、塗布速度と射出周波数を調整して、パターンを印刷した。インクジェット印刷装置としては、インクジェットヘッド(コニカミノルタ社製)を取り付けた卓上型ロボットShotmaster-300(武蔵エンジニアリング社製)を用い、インクジェット評価装置EB150(コニカミノルタ社製)にて制御した。
上記金属細線までを作製した樹脂基材(50mm×50mm)を、市販の真空蒸着装置の基板ホルダーに固定し、化合物(1-6)をタンタル製抵抗加熱ボートに入れた。これら基板ホルダーと抵抗加熱ボートとを真空蒸着装置の第1真空槽に取り付けた。また、タングステン製の抵抗加熱ボートに銀(Ag)を入れ、第2真空槽内に取り付けた。
以上の方法で、試料100の透明導電部材を作製した。
真空蒸着装置内の蒸着用るつぼに、発光ユニットの各層の構成材料をそれぞれ有機EL素子の作製に最適の量で充填した。蒸着用るつぼは、モリブデン、タングステン等の抵抗加熱用材料で作製されたものを用いた。
次に、化合物GD-1、RD-1及びH-2を、化合物GD-1の濃度が17%、化合物RD-1の濃度が0.8%になるように、0.1nm/秒の蒸着速度で共蒸着させ、層厚15nmの黄色発光を呈するリン光発光層を作製した。
さらに、フッ化リチウム(LiF)を層厚1.5nmにて作製し、アルミニウム1nm、銀150nmを蒸着して第2電極(陰極)を作製した。第2電極は、正孔注入輸送層から電子輸送層までの有機機能層によって絶縁された状態で、基板の周縁に端子部分が引き出された形状で作製した。
(粘着剤組成物の調製)
ポリイソブチレン系樹脂としてオパノールB50(BASF製、Mw:34万)100質量部、ポリブテン樹脂として日石ポリブテン グレードHV-1900(新日本石油社製、Mw:1900)30質量部、ヒンダードアミン系光安定剤としてTINUVIN765(チバ・ジャパン製、3級のヒンダードアミン基を有する)0.5質量部、ヒンダードフェノール系酸化防止剤としてIRGANOX1010(チバ・ジャパン製、ヒンダードフェノール基のβ位が二つともターシャリーブチル基を有する)0.5質量部、及び環状オレフィン系重合体としてEastotac H-100L Resin(イーストマンケミカル.Co.製)50質量部をトルエンに溶解し、固形分濃度約25質量%の粘着剤組成物を調製した。
ガスバリア層として、アルミニウム(Al)が蒸着されたポリエチレンテレフタレートフィルム アルペット12/34(アジアアルミ(株)社製)を用い、調製した上記粘着剤組成物の溶液を乾燥後に作製される粘着剤層の層厚が20μmとなるようにアルミニウム側(ガスバリア層側)に塗工し、120℃で2分間乾燥させて粘着剤層を作製した。次に、作製した粘着剤層面に対して、剥離シートとして、厚さ38μmの剥離処理をしたポリエチレンテレフタレートフィルムの剥離処理面を貼付して、封止用粘着シートを作製した。
上述の方法で作製した封止用粘着シートを、窒素雰囲気下において、剥離シートを除去し、120℃に加熱したホットプレート上で10分間乾燥した後、室温(25℃)まで低下するのを確認してから、陰極を完全に覆う形でラミネートし、90℃で10分加熱した。このようにして試料100の有機EL素子を作製した。
試料100と同様にプライマー層を作製した樹脂基材上に、下記の方法で、屈折率2.3、アスペクト比2以下の粒子割合が65%、粒子径350nmの棒状粒子と、屈折率が1.807のバインダとからなる、樹脂基材側の粒子存在率40%、PB比45%の光散乱層を350nmの厚さで作製した。そして、この光散乱層上に、試料100と同様の方法で透明導電膜の作製から封止までを行い、試料101の透明導電部材、及び、有機EL素子を作製した。
酸化チタン粒子(チタニックスJR―808、テイカ社製)と、バインダ(PCPM-47-BPA、Pixelligent Technologies社製)とのPB比45%、2-プロパノール、プロピレングリコールモノメチルエーテル(PGME)と2-メチル-2,4-ペンタンジオール(PD)との溶媒比が、20質量%/40質量%/40質量%である有機溶媒中での固形分濃度が12質量%となるように調製した。
上記の固形分(有効質量成分)に対し、0.4質量%の添加剤(ビックケミージャパン株式会社製 Disperbyk-2096)を加え、10ml量の比率で処方設計して光散乱層形成用分散液を調製した。
次に、TiO2分散液を100rpmで撹拌しながら、樹脂溶液を少量ずつ混合添加し、添加完了後、500rpmまで撹拌速度を上げ、10分間混合した後、疎水性PVDF0.45μmフィルター(ワットマン社製)にて濾過し、目的の光散乱層形成用分散液を得た。
(改質処理装置)
装置:株式会社 エム・ディ・コム製エキシマ照射装置MODEL MECL-M-1-200
照射波長:172nm
ランプ封入ガス:Xe
エキシマランプ光強度:130mW/cm2(172nm)
試料と光源の距離:2mm
ステージ加熱温度:70℃
照射装置内の酸素濃度:20.0%
照射エネルギー:8J/cm2
光散乱層の光散乱層形成用分散液の固形分濃度が10質量%となるように調製した以外は、上述の試料101と同様の方法で、試料102の透明導電部材、及び、有機EL素子を作製した。
光散乱層の作製に使用する粒子をMP-6035(綜研化学社製)に変更し、屈折率1.48、アスペクト比2以下の粒子割合が100%、粒子径450nmの球状粒子と、屈折率が1.807のバインダとからなる、樹脂基材側の粒子存在率40%、PB比45%の光散乱層を400nmの厚さで作製した以外は、上述の試料101と同様の方法で、試料103の透明導電部材、及び、有機EL素子を作製した。
光散乱層の作製に使用する粒子をSG-TO100(Sukgyung AT社製)に変更し、屈折率2.3、アスペクト比2以下の粒子割合が100%、粒子径100nmの球状粒子と、屈折率が1.807のバインダとからなる、樹脂基材側の粒子存在率75%、PB比45%の光散乱層を300nmの厚さで作製した以外は、上述の試料102と同様の方法で、試料104の透明導電部材、及び、有機EL素子を作製した。
光散乱層の作製に使用する粒子をSG-TO100(Sukgyung AT社製)に変更し、屈折率2.3、アスペクト比2以下の粒子割合が100%、粒子径100nmの球状粒子と、屈折率が1.807のバインダとからなる、樹脂基材側の粒子存在率75%、PB比4%の光散乱層を300nmの厚さで作製した以外は、上述の試料102と同様の方法で、試料105の透明導電部材、及び、有機EL素子を作製した。
光散乱層の作製に使用する粒子をB-30(堺化学工業社製)に変更し、屈折率2.0、アスペクト比2以下の粒子割合が15%、粒子径300nmの球状粒子と、屈折率が1.807のバインダとからなる、樹脂基材側の粒子存在率60%、PB比20%の光散乱層を500nmの厚さで作製した以外は、上述の試料102と同様の方法で、試料106の透明導電部材、及び、有機EL素子を作製した。
光散乱層の作製において、樹脂基材側の粒子存在率80%、PB比30%の光散乱層を260nmの厚さで作製した以外は、上述の試料104と同様の方法で、試料107の透明導電部材、及び、有機EL素子を作製した。
光散乱層の作製に使用する粒子をSG-TO200(Sukgyung AT社製)に変更し、屈折率2.3、アスペクト比2以下の粒子割合が100%、粒子径210nmの球状粒子と、屈折率が1.807のバインダとからなる、樹脂基材側の粒子存在率55%、PB比30%の光散乱層を230nmの厚さで作製した以外は、上述の試料102と同様の方法で、試料108の透明導電部材、及び、有機EL素子を作製した。
光散乱層の作製に使用する粒子をSG-TO200(Sukgyung AT社製)に変更し、屈折率2.3、アスペクト比2以下の粒子割合が100%、粒子径210nmの球状粒子と、屈折率が1.807のバインダとからなる、樹脂基材側の粒子存在率60%、PB比30%の光散乱層を300nmの厚さで作製した以外は、上述の試料102と同様の方法で、試料109の透明導電部材、及び、有機EL素子を作製した。
光散乱層の作製に使用する粒子をR-42(堺化学工業社製)に変更し、屈折率2.3、アスペクト比2以下の粒子割合が85%、粒子径290nmの球状粒子と、屈折率が1.807のバインダとからなる、樹脂基材側の粒子存在率65%、PB比20%の光散乱層を500nmの厚さで作製した以外は、上述の試料102と同様の方法で、試料110の透明導電部材、及び、有機EL素子を作製した。
光散乱層の作製において、調製する溶液粒子と樹脂との固形分比率を20体積%(粒子)/80体積%(樹脂)とし、樹脂基材側の粒子存在率65%、PB比20の光散乱層を500nmの厚さで作製し、下記の方法でITOからなる透明導電膜を作製した以外は、上述の試料110と同様の方法で、試料111の透明導電部材、及び、有機EL素子を作製した。
金属細線までを作製した基材を、ITOターゲットを装着した市販の平行平板スパッタリング装置に移し、スパッタリング装置のチャンバー内を5×10-3Paまで減圧した後、窒素ガスと酸素ガスを流しながら、DC出力500Wで放電し、成膜速度10nm/秒で、膜厚150nmのITOの透明導電膜を作製した。
光散乱層の作製において、調製する溶液粒子と樹脂との固形分比率を5体積%(粒子)/95体積%(樹脂)とし、樹脂基材側の粒子存在率70%、PB比5%の光散乱層を500nmの厚さで作製し、下記の方法でIZOからなる透明導電膜を作製した以外は、上述の試料107と同様の方法で、試料112の透明導電部材、及び、有機EL素子を作製した。
金属細線までを作製した基材を、IZOターゲットを装着した市販の平行平板スパッタリング装置に移し、スパッタリング装置のチャンバー内を5×10-3Paまで減圧した後、窒素ガスと酸素ガスを流しながら、DC出力500Wで放電し、成膜速度10nm/秒で、膜厚250nmのIZOの透明導電膜を作製した。
光散乱層の作製において、樹脂基材側の粒子存在率65%、PB比10%の光散乱層を500nmの厚さで作製した以外は、上述の試料112と同様の方法で、試料113の透明導電部材、及び、有機EL素子を作製した。
光散乱層の作製において、樹脂基材側の粒子存在率70%、PB比20%の光散乱層を600nmの厚さで作製した以外は、上述の試料112と同様の方法で、試料114の透明導電部材、及び、有機EL素子を作製した。
光散乱層の作製において、樹脂基材側の粒子存在率85%、PB比20%の光散乱層を800nmの厚さで作製した以外は、上述の試料114と同様の方法で、試料115の透明導電部材、及び、有機EL素子を作製した。
光散乱層の作製において、樹脂基材側の粒子存在率95%、PB比20%の光散乱層を1200nmの厚さで作製した以外は、上述の試料114と同様の方法で、試料116の透明導電部材、及び、有機EL素子を作製した。
光散乱層の作製に使用する粒子をBT-HPS500(東亜合成社製)に変更し、屈折率2.42、アスペクト比2以下の粒子割合が90%、粒子径400nmの球状粒子と、屈折率が1.807のバインダとからなる、樹脂基材側の粒子存在率60%、PB比20%の光散乱層を700nmの厚さで作製した以外は、上述の試料114と同様の方法で、試料117の透明導電部材、及び、有機EL素子を作製した。
光散乱層の作製に使用するバインダを230La(屈折率1.5、有機無機ハイブリッド樹脂、ラサ工業社製)に変更した以外は、上述の試料117と同様の方法で、試料118の透明導電部材、及び、有機EL素子を作製した。
光散乱層の作製において、樹脂基材側の粒子存在率65%、PB比20の光散乱層を500nmの厚さで作製し、さらに、この光散乱層上に下記の方法でアブレーション防止層を作製し、アブレーション防止層上に導電層を作製した以外は、上述の試料114と同様の方法で、試料119の透明導電部材、及び、有機EL素子を作製した。
アブレーション防止層を作製するための塗布液として、旭化成(株)社製、サランレジンR204(塩化ビニリデン;PVDC)を、THF(テトラヒドロフラン)/TOL(トルエン)に溶解し、固形分濃度が5質量%になるように調整した。
アブレーション防止層を、ポリシラザンを用いて下記の方法で作製した以外は、上述の試料119と同様の方法で、試料120の透明導電部材、及び、有機EL素子を作製した。
アブレーション防止層を作製するための塗布液として、無触媒のパーヒドロポリシラザン20質量%ジブチルエーテル溶液(アクアミカNN120-20、AZエレクトロニックマテリアルズ社製)と、アミン触媒を固形分の5質量%含有するパーヒドロポリシラザン20質量%ジブチルエーテル溶液(アクアミカNAX120-20、AZエレクトロニックマテリアルズ社製)とを混合し、さらに、アミン触媒を固形分の1質量%に調整した後、ジブチルエーテルでさらに希釈して、5質量%ジブチルエーテル溶液を調製した。
アブレーション防止層を、下記の方法を用いて窒化ケイ素(SiN)で作製した以外は、上述の試料119と同様の方法で、試料121の透明導電部材、及び、有機EL素子を作製した。
マグネトロンスパッタリング装置(アネルバ製、SPF-730H)のチャンバー内に、光散乱層層まで作製した基材を装着した。次に、マグネトロンスパッタリング装置のチャンバー内を、油回転ポンプ及びクライオポンプにより、到達真空度3.0×10-4Paまで減圧した。ターゲットとしてSiを使用し、アルゴンガス7sccm、及び、窒素ガス26sccmを導入し、周波数13.56MHzの高周波電力(投入電力1.2kW)を印加し、成膜圧力0.4Paで、膜厚300nmの窒化ケイ素膜の成膜を行った。これにより、窒化ケイ素(SiN)からなるアブレーション防止層を5nmの膜厚で作製した。
光散乱層の作製に使用する粒子をMP-6035(綜研化学社製)に変更し、さらに、バインダをオルガチックスPC-250(マツモトファインケミカル社製)に変更し、屈折率1.48、アスペクト比2以下の粒子割合が100%、粒子径450nmの球状粒子と、屈折率が1.91のバインダとからなる、樹脂基材側の粒子存在率60%、PB比20の光散乱層を500nmの厚さで作製した以外は、上述の試料121と同様の方法で、試料122の透明導電部材、及び、有機EL素子を作製した。
アブレーション防止層を120nmとした以外は、上述の試料121と同様の方法で、試料123の透明導電部材、及び、有機EL素子を作製した。
アブレーション防止層を50nmとした以外は、上述の試料121と同様の方法で、試料124の透明導電部材、及び、有機EL素子を作製した。
作製した試料100~試料124の透明導電部材、及び、有機EL素子について、下記のように素子特性の評価を行った。
透明導電部材の作製において、金属細線のアブレーションを評価した。アブレーションの評価方法としては、光学顕微鏡を用いて目視観察を行い、金属細線がダメージを受けているかどうかを判断し、B以上を合格とした。
S:アブレーションが全く発生しない。
A:まれに金属細線のエッジ部分に僅かにアブレーションが発生する。実害なし。
B:金属細線のエッジ部分に僅かにアブレーションが発生するが実害なし。
C:アブレーションにより金属細線が断線している箇所あり。
D:アブレーションにより金属細線の多くが断線する。
(全光束)
作製した各試料に対し、積分球を用いて一定電流における光束を測定した。具体的には、20A/m2の定電流密度で全光束を測定した。各試料の発光効率は、試料100の発光効率を1.00とする相対値で求め、1.2倍以上を合格とした。
85℃(dry)の恒温槽に各試料を投入し、24時間ごとに上記発光効率評価と同様の定電流密度における保存前と保存後との電圧上昇率を評価した。評価開始時より電圧上昇が1.0Vを超えた素子を不可とし、不可となるまでの期間(日数)を評価した。各試料の評価は、試料100に対しての相対値として求めた。そして、各試料の相対値を下記の基準で評価し、Aを合格とした。
A:相対値が試料100と同等以上
B:相対値が0.5倍以上、1.0倍未満
C:相対値が0.5倍未満
85℃(dry)の恒温槽に各試料を投入し、0.5mm以上のダークスポットが発生した素子を不可とし、不可となるまでの期間(日数)を評価した。各試料の評価は、試料100に対しての相対値として求めた。そして、各試料の相対値を下記の基準で評価し、Aを合格とした。
A: 相対値が試料100と同等以上
B: 相対値が0.5倍以上、1.0倍未満
C: 相対値が0.5倍未満
Claims (8)
- 樹脂基材と、
前記樹脂基材上に形成された、粒子とバインダとを含む光散乱層と、
前記光散乱層上に形成された金属細線と、
前記金属細線上に形成された透明導電膜と、を備え、
前記光散乱層は、前記粒子としてアスペクト比が2以下の球状粒子を80%以上含み、
前記光散乱層の厚さが、前記粒子の平均粒子径よりも大きく、
前記光散乱層において、厚さ方向の中心より前記樹脂基材側の領域の前記粒子の粒子存在率が、厚さ方向の中心より前記透明導電膜側の領域の前記粒子の粒子存在率よりも大きい
透明導電部材。 - 前記光散乱層における前記粒子の体積比率が、5vol%以上40vol%以下である請求項1に記載の透明導電部材。
- 前記粒子と前記バインダとの屈折率差が0.2以上1.0以下である請求項1に記載の透明導電部材。
- アスペクト比が2以下の前記粒子の平均粒子径が、200nm以上500nm以下である請求項1に記載の透明導電部材。
- 前記光散乱層の厚さが250nm以上1000nm以下である請求項1に記載の透明導電部材。
- 前記光散乱層上にアブレーション防止層を備え、前記アブレーション防止層の直上に前記金属細線が形成されている請求項1に記載の透明導電部材。
- 前記アブレーション防止層の厚さが、10nm以上100nm以下である請求項6に記載の透明導電部材。
- 請求項1に記載の透明導電部材を用いた有機エレクトロルミネッセンス素子。
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