WO2001058221A1 - Dispositif d'affichage par electroluminescence organique et procede de production du dispositif - Google Patents
Dispositif d'affichage par electroluminescence organique et procede de production du dispositif Download PDFInfo
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- WO2001058221A1 WO2001058221A1 PCT/JP2001/000531 JP0100531W WO0158221A1 WO 2001058221 A1 WO2001058221 A1 WO 2001058221A1 JP 0100531 W JP0100531 W JP 0100531W WO 0158221 A1 WO0158221 A1 WO 0158221A1
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- Prior art keywords
- organic
- medium
- display device
- light emitting
- dehydration
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- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- SJCKRGFTWFGHGZ-UHFFFAOYSA-N magnesium silver Chemical compound [Mg].[Ag] SJCKRGFTWFGHGZ-UHFFFAOYSA-N 0.000 description 1
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- 229910052750 molybdenum Inorganic materials 0.000 description 1
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- IBHBKWKFFTZAHE-UHFFFAOYSA-N n-[4-[4-(n-naphthalen-1-ylanilino)phenyl]phenyl]-n-phenylnaphthalen-1-amine Chemical group C1=CC=CC=C1N(C=1C2=CC=CC=C2C=CC=1)C1=CC=C(C=2C=CC(=CC=2)N(C=2C=CC=CC=2)C=2C3=CC=CC=C3C=CC=2)C=C1 IBHBKWKFFTZAHE-UHFFFAOYSA-N 0.000 description 1
- GIFAOSNIDJTPNL-UHFFFAOYSA-N n-phenyl-n-(2-phenylphenyl)naphthalen-1-amine Chemical group C1=CC=CC=C1N(C=1C2=CC=CC=C2C=CC=1)C1=CC=CC=C1C1=CC=CC=C1 GIFAOSNIDJTPNL-UHFFFAOYSA-N 0.000 description 1
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- WCPAKWJPBJAGKN-UHFFFAOYSA-N oxadiazole Chemical compound C1=CON=N1 WCPAKWJPBJAGKN-UHFFFAOYSA-N 0.000 description 1
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 1
- DFIYWQBRYUCBMH-UHFFFAOYSA-N oxogermane Chemical compound [GeH2]=O DFIYWQBRYUCBMH-UHFFFAOYSA-N 0.000 description 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 1
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- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical class N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 1
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- 229920005990 polystyrene resin Polymers 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- HNJBEVLQSNELDL-UHFFFAOYSA-N pyrrolidin-2-one Chemical compound O=C1CCCN1 HNJBEVLQSNELDL-UHFFFAOYSA-N 0.000 description 1
- RQGPLDBZHMVWCH-UHFFFAOYSA-N pyrrolo[3,2-b]pyrrole Chemical class C1=NC2=CC=NC2=C1 RQGPLDBZHMVWCH-UHFFFAOYSA-N 0.000 description 1
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- 229910052710 silicon Inorganic materials 0.000 description 1
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- 239000005361 soda-lime glass Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 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
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- 238000005507 spraying Methods 0.000 description 1
- PJANXHGTPQOBST-UHFFFAOYSA-N stilbene Chemical compound C=1C=CC=CC=1C=CC1=CC=CC=C1 PJANXHGTPQOBST-UHFFFAOYSA-N 0.000 description 1
- 235000021286 stilbenes Nutrition 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
- 239000000126 substance Substances 0.000 description 1
- 229940124530 sulfonamide Drugs 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000002076 thermal analysis method Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- NZFNXWQNBYZDAQ-UHFFFAOYSA-N thioridazine hydrochloride Chemical class Cl.C12=CC(SC)=CC=C2SC2=CC=CC=C2N1CCC1CCCCN1C NZFNXWQNBYZDAQ-UHFFFAOYSA-N 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- ODHXBMXNKOYIBV-UHFFFAOYSA-N triphenylamine Chemical compound C1=CC=CC=C1N(C=1C=CC=CC=1)C1=CC=CC=C1 ODHXBMXNKOYIBV-UHFFFAOYSA-N 0.000 description 1
- AAAQKTZKLRYKHR-UHFFFAOYSA-N triphenylmethane Chemical compound C1=CC=CC=C1C(C=1C=CC=CC=1)C1=CC=CC=C1 AAAQKTZKLRYKHR-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000000927 vapour-phase epitaxy Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- 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
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
-
- 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
- H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
-
- 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
- H05B33/04—Sealing arrangements, e.g. against humidity
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/87—Passivation; Containers; Encapsulations
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/40—Thermal treatment, e.g. annealing in the presence of a solvent vapour
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/17—Carrier injection layers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/17—Carrier injection layers
- H10K50/171—Electron injection layers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
- H10K50/865—Arrangements for improving contrast, e.g. preventing reflection of ambient light comprising light absorbing layers, e.g. light-blocking layers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/122—Pixel-defining structures or layers, e.g. banks
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
- H10K59/8792—Arrangements for improving contrast, e.g. preventing reflection of ambient light comprising light absorbing layers, e.g. black layers
Definitions
- the present invention relates to an organic electroluminescent display (hereinafter sometimes simply referred to as an organic EL display) and a method of manufacturing the same.
- Japanese Patent Application Laid-Open No. 9-148066 discloses an organic EL display device in which an organic EL element and a desiccant are respectively enclosed by using sealing means.
- No. 46775 discloses an organic EL device in which a protective film made of an inorganic compound such as germanium oxide (GeO) is provided on an upper electrode for moisture prevention.
- a non-light-emitting region or a non-light-emitting region having a width or a diameter of about several tens of meters is provided around a pixel. There was a problem that a light emitting portion was generated, and the light emitting area was reduced, thereby lowering the light emission luminance.
- an organic luminescent medium formed by an ink jet method disclosed in JP-A-11-43058 and JP-A-11-44070 has a lower frequency of occurrence of a non-light-emitting region or a non-light-emitting portion than an organic light-emitting medium formed by a vacuum evaporation method. It is extremely high, and there is a problem that it is difficult to effectively suppress the generation of a non-light-emitting region or a non-light-emitting portion even when conventional sealing means and moisture-proof means are used.
- the inventors of the present invention have studied the conventional problems, and as a result, as shown conceptually in FIG. 16 and FIG.
- the moisture contained in the flat layer and the interlayer insulating film is It has been found that the organic EL display device has an adverse effect due to the deterioration of the electrode by moving to the external electrodes, and an organic EL display device having excellent durability has been proposed by improving the adverse effect.
- Japanese Patent Application Laid-Open No. H11-126156 proposes an organic EL display device in which the water content of a flattening layer provided between a fluorescent medium and a lower electrode is 1.0% by weight or less.
- Japanese Patent Application Laid-Open No. H11-54-285 discloses an organic EL display device in which a part of an interlayer insulating film contains a water absorbing agent so that the water content is 0.1% by weight or less. Has been proposed.
- the inventors of the present invention further studied such a problem, and found that the water content of the organic light emitting medium or the like after assembling the organic EL display device, the generation of a non-light-emitting region or a non-light-emitting portion, or the generation of a light-emitting surface. It has been found that there is a certain critical relationship with deterioration, and that the generation of a non-light emitting region or a non-light emitting portion around a pixel can be drastically suppressed by setting the water content to a value below a certain range.
- the present invention is applicable to a case where the pixel is made higher definition (for example, the pixel size is less than 100 mx 300 / m square), and even if the organic luminescent medium is formed into a wet film (for example, a coating method), Alternatively, even when stored in a high-temperature environment for a long time (for example, at 80 ° C for 2 weeks or more), it is possible to prevent the emission area from being reduced due to the occurrence of a non-emission area or a non-emission area. It is an object of the present invention to provide an organic EL display device which is excellent in performance and can obtain high emission luminance over a long period of time, and a method for efficiently producing such an organic EL display device. Disclosure of the invention
- an organic EL display device including a lower electrode, an organic light emitting medium, and a counter electrode on a supporting substrate, wherein the water content of the organic light emitting medium is 0.05% by weight.
- the organic EL display device by configuring the organic EL display device in this way, it is possible to prevent the counter electrode from being oxidized and degraded due to moisture in the organic light emitting medium, and not only at room temperature but also in a high temperature environment. It is possible to suppress a reduction in the light emitting area due to the occurrence of a non-light emitting region or a non-light emitting portion for a long time.
- a lower electrode, an interlayer insulating film (sometimes referred to as an electric insulating layer), an organic luminescent medium, and a counter electrode are formed on a supporting substrate.
- the moisture content of the interlayer insulating film and the organic luminescent medium is set to a value of 0.05% by weight or less.
- a color filter and a fluorescent medium are provided on the surface of the counter electrode opposite to the organic light emitting medium. Is also preferable.
- a color filter and / or a fluorescent medium or a member, a lower electrode, an interlayer insulating film, an organic luminescent medium,
- An organic EL display device including a counter electrode and a color filter and / or a fluorescent medium, wherein the water content of the interlayer insulating film and the organic luminescent medium is set to a value of 0.05% by weight or less.
- a display device is provided.
- This configuration not only facilitates color display, but also suppresses a reduction in the light emitting area due to the generation of a non-light emitting region or a non-light emitting portion for a long time even in a high temperature environment such as 80 ° C. it can.
- a color filter and / or a fluorescent medium, or one of the members, a planarizing layer, a lower electrode In an organic EL display device including an interlayer insulating film, an organic light emitting medium, and a counter electrode, the water content of the color filter and the fluorescent medium, or any one of the members, the planarizing layer, the interlayer insulating film, and the organic light emitting medium is set to 0. An organic EL display device with a value of .05% by weight or less is provided.
- Another embodiment of the present invention relates to a method for manufacturing an organic EL display device, comprising: providing a lower electrode, an organic luminescent medium, and a counter electrode on a supporting substrate; By providing a dehydration step before and / or after the formation or at any one of the times, the water content of the organic light emitting medium after assembling the organic EL display device is adjusted to a value of 0.05% by weight or less.
- the dew point in the dehydration step is preferably set to a value of -1 o ° c or less.
- the degree of vacuum in the dehydration step is set to a value of 13.3 Pa (0.1 Torr) or less.
- the heating temperature in the step is preferably set to a value within a range of 60 to 300 ° C.
- a manufacturing apparatus including a dewatering unit, a film forming unit, and a transport unit connecting these units is used.
- a dehydration unit Using a dehydration unit, a step of dehydrating the support substrate before and / or after forming the organic luminescent medium, and
- an organic electroluminescent element layer provided with a lower electrode, an organic luminescent medium, and a counter electrode on a support substrate;
- the water content of the organic light emitting medium after assembly of the organic EL display device is set to a value of 0.05% by weight or less. It is characterized by:
- another embodiment of a method of manufacturing an organic EL display device is a method of manufacturing an organic EL display device having a lower electrode, an organic luminescent medium, and a counter electrode provided on a support substrate.
- a dehydration step is performed to perform a dehydration process, so that the water content of the organic luminescent medium after the assembly of the organic EL display device is set to a value of 0.05% by weight or less. It is characterized by doing.
- An organic EL display device can be provided efficiently.
- a manufacturing apparatus including a dewatering unit, a film forming unit, and a transport unit for connecting these units is used.
- a dehydration unit Using a dehydration unit, a step of dehydrating the support substrate after forming the organic luminescent medium;
- FIG. 1 is a diagram showing the relationship between the water content of an organic light emitting medium and the light emitting area ratio.
- FIG. 2 is a cross-sectional view of an organic EL display device (part 1).
- FIG. 3 is a cross-sectional view of an organic EL display device (part 2).
- Figure 4 is a cross-sectional view of an organic EL display device (part 3).
- FIG. 5 is a plan view showing a matrix of electrodes in the organic EL display device.
- FIG. 6 is a cross-sectional view of the organic EL display device shown in FIG.
- FIG. 7 is a cross-sectional view of a TFT element provided in an organic EL display device.
- FIG. 8 is a cross-sectional view of an organic EL display device (part 4).
- FIG. 9 is a cross-sectional view of an organic EL display device (part 5).
- FIG. 10 is a cross-sectional view of an organic EL display device (part 6).
- FIG. 11 is a schematic diagram of an organic EL display device manufacturing apparatus (part 1).
- Figure 12 is a schematic diagram of an organic EL display device manufacturing apparatus (part 2).
- FIG. 13 is a schematic diagram of a dehydration unit in an organic EL display device manufacturing apparatus (part 1).
- FIG. 14 is a schematic diagram of a dewatering unit in an organic EL display device manufacturing apparatus (part 2).
- FIG. 15 is a diagram for explaining the occurrence of a non-light emitting region or a non-light emitting portion in a conventional organic EL display device (part 1).
- FIG. 16 is a diagram for explaining the occurrence of a non-light emitting region or a non-light emitting portion in a conventional organic EL display device (part 2).
- FIG. 17 is a diagram for explaining the occurrence of a non-light emitting region or a non-light emitting portion in a conventional organic EL display device (part 3).
- FIG. 18 is a diagram provided for explanation of a fully automatic moisture absorption / desorption measuring device.
- FIG. 19 is a moisture measurement chart measured by the fully automatic moisture adsorption / desorption measuring device shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- the organic EL display device 18 of the first embodiment includes a support substrate 1, a fluorescent medium 9 (or a color filter 11), a flattening layer 10 and a support substrate 1, as shown in FIG. It is substantially composed of an interlayer insulating film 3, a lower electrode 2, an organic luminescent medium 4, a counter electrode (upper electrode) 5, and a sealing glass substrate 8.
- the fluorescent medium 9 and the filter 11 can be provided independently, or preferably both.
- the organic light emitting medium 4 (or the organic light emitting medium 4, the fluorescent medium 9 (or the color filter 11), the flat layer 10 and the interlayer insulating film 3 shown in FIG.
- the mixture has a water content of 0.05% by weight or less. Therefore, even if the pixel is made high-definition or driven under a high temperature condition, a non-light emitting area or a non-light emitting area is generated. And a decrease in the light emitting region can be effectively prevented.
- the organic light emitting medium can be defined as a medium including an organic light emitting layer capable of emitting EL light by recombination of electrons and holes.
- Such an organic luminescent medium can be constituted by, for example, laminating the following layers on an anode.
- the structure of ⁇ is usually preferably used because higher emission luminance is obtained and durability is excellent.
- the type of the organic light emitting material used for the organic light emitting medium is not particularly limited, but preferably has the following three functions in order to obtain more excellent light emitting characteristics and durability.
- Charge injection function A function that can inject holes from the anode or the hole injection layer while applying an electric field, while injecting electrons from the cathode layer or the electron injection layer.
- Transport function A function to move injected holes and electrons by the force of an electric field.
- Light-emitting function A function that provides a field for the recombination of electrons and holes and connects them to light emission.
- examples of the organic light emitting material having such a function include, for example, a p-quo overnight phenyl derivative, a p-quink phenyl derivative, a benzothiazole compound, a benzimidazole compound, a benzoxazole compound, and a metal chelation compound.
- organic light-emitting materials 4,4′-bis (2,2-di-t-butylphenylvinyl) biphenyl (abbreviated as DT BPBB i) as an aromatic dimethylidin compound and 4 , 4'-bis (2,2-diphenylvinyl) biphenyl (abbreviated as DPVBi) and derivatives thereof are more preferred.
- an organic light-emitting material having a distyrylarylene skeleton or the like is used as a host material, and the host material is doped with a strong fluorescent dye from blue to red as a dopant, for example, a coumarin-based material or a fluorescent dye similar to the host.
- DPVB i N, N-diphenylaminobenzene
- DPAVB N, N-diphenylaminobenzene
- styrylbenzene compound or the like. Is preferred.
- the organic light-emitting medium also contains a fluorescent dye in a fluorescent medium described later, a dye, an organic pigment, and the like.
- organic light-emitting material for example, a low-molecular-weight material having a number average molecular weight of less than 10,000 measured by gel permeation chromatography (GPC) so that vacuum deposition or sputtering can be performed. It is preferable to use ⁇ , because it is possible to uniformly form a wet film using a spin coater or an ink jet, etc. Conversely, use a polymer material with a number average molecular weight of 10,000 or more It is also preferable to do so.
- GPC gel permeation chromatography
- polystyrene resin examples include polyarylene pinylene and its derivative (for example, PPV;), polyfluorene and its derivative, fluorene-containing copolymer and its derivative, and the like.
- the hole injection layer in the organic luminescent medium 1 X 10 4 ⁇ : hole mobility measured when applying a voltage in the range of LX 10 6 V / cm is, 1 X 10- 6 cm 2 It is preferable to use a compound having an ionization energy of 5.5 eV or less, which is not less than / V ⁇ sec. By providing such a hole injection layer, hole injection into the organic light emitting layer becomes good, and high light emission luminance can be obtained, or low voltage driving becomes possible.
- constituent material of such a hole injection layer include a porphyrin compound, an aromatic tertiary amine compound, a styrylamine compound, an aromatic dimethylidin compound, and a condensed aromatic ring compound.
- a porphyrin compound an aromatic tertiary amine compound, a styrylamine compound, an aromatic dimethylidin compound, and a condensed aromatic ring compound.
- 4,4 ', 4' "tris [N- (3-methylphenyl) -N-phenylamino] triphenyla And organic compounds such as min (abbreviated as MTDATA).
- inorganic compounds such as p-type Si and p-type SiC are used as constituent materials of the hole injection layer. It is also preferable to use an object.
- the electron injection layer in an organic light emitting medium an electron mobility measured when applying a voltage in the range of 1 X 10 4 ⁇ 1 X 10 6 VZc m is, 1 X 10- 6 cm 2 / V ⁇ It is preferable to use a compound having an ionization energy of 5.5 eV or more for seconds or more. By providing such an electron injection layer, electron injection into the organic light emitting layer becomes good, and high emission luminance can be obtained, or low voltage driving becomes possible.
- constituent material of such an electron injection layer include a metal complex of 8-hydroxyquinoline (A 1 chelate: A 1 Q), a derivative thereof, and an oxaziazole derivative. .
- the adhesion improving layer in the organic luminescent medium can be regarded as one form of such an electron injection layer, that is, a layer made of a material having particularly good adhesion to the cathode among the electron injection layers.
- -It is preferable to comprise a metal complex of hydroxyquinoline or a derivative thereof.
- an organic semiconductor layer having a conductivity of 1 ⁇ 10-1 GS / cm or more in contact with the above-described electron injection layer. By providing such an organic semiconductor layer, the electron injection property to the organic light emitting layer is further improved.
- the thickness of the organic light-emitting medium is not particularly limited and can be appropriately selected depending on the situation. However, the thickness is preferably in a range of 5 nm to 5 m.
- the thickness of the organic luminescent medium is less than 5 nm, the luminous brightness and durability may decrease.On the other hand, when the thickness of the organic luminescent medium exceeds 5, the value of the applied voltage increases. This is because it may be.
- the thickness of the organic luminescent medium is set to 10 ⁇ ! Value within 3 m Is more preferable, and the value is more preferably in the range of 20 nm to lm.
- the water content (W) of the organic light-emitting medium defined by the following formula (1) is set to 0.05% by weight. The following values are required.
- the water content is more preferably set to a value in the range of 0.0001 to 0.04% by weight, and still more preferably to a value in the range of 0.0001 to 0.03% by weight. Most preferably, it is within the range of 0.01% by weight.
- Weight A Fully automatic moisture absorption / desorption measurement device (with precision balance) for organic luminescent media collected from OLED display devices in an environment where moisture does not enter from the outside (for example, in a dry box or in a dry gas atmosphere) ) Is the weight (mg) measured by
- Weight B Organic luminous medium in a dry box or dry gas atmosphere, for example
- the outline of the fully automatic moisture adsorption / desorption measuring device will be described with reference to FIGS.
- the fully automatic moisture absorption / desorption measuring device 51 shown in FIG. 18 is an example of the device, and is composed of a circulating section A and a moisture measuring section B, which are separated by dotted lines in the drawing.
- the circulation section A is divided into a gas storage section 68 and a forked section from the gas storage section 68. And a circulating path 61 connecting these circulating devices 66 and 67 and the Z component measuring section B. These circulating devices 66 and 67 are remotely controlled by a control room 65 included in the moisture measuring section.
- the moisture measuring section ⁇ ⁇ is composed of a control room 65, a balance room 62, a comparison sample room (including a comparison sample dish) 64, a dry box 56, an oil bath 52, and the like.
- a heating device 57 is provided around the dry box 56.
- the temperature inside the dry box 56 is set near the balance 53 on which the measurement sample is placed.
- a temperature sensor 54 for monitoring the temperature and a humidity sensor 54 for monitoring the humidity are provided respectively.
- the dry gas supplied from the circulation section ⁇ is passed through the oil bath 52 to make the temperature or humidity constant, and then the The gas is introduced into the dry box 56 through the injection port 58, and the humidity and temperature in the dry box 56 can be kept constant by the heating device 57. Then, in such a state, the weight of the measurement sample placed on the balance 53 is measured using the precision balance 63 while comparing it with the comparison sample (reference) in the comparison sample chamber 64. It is possible to measure at 65.
- Fig. 19 shows the measurement chart obtained by measuring the weight.
- the elapsed time (minutes) is shown on the horizontal axis, and the weight (g) of the sample is shown on the vertical axis. It is.
- the weight A is 55.4.40 mg
- the weight B is 55.4.30 Omg.
- the humidity in the dry box 56 is controlled to 0%.
- the weight A and the weight B are preferably measured using the precision balance provided in the fully automatic moisture adsorption / desorption measuring device as described above.
- a method according to ASTM D570-63 The moisture content can also be measured by thermal analysis (differential thermal analysis DTA, differential scanning calorimetry DSC) or Karl Fischer method.
- the moisture as the water content measured in this way diffuses without being localized in an organic film other than the organic luminescent medium such as an interlayer insulating film, penetrates into the organic luminescent medium, and enters the equilibrium state. It is considered that the organic light-emitting medium or the counter electrode is oxidized as soon as the temperature reaches.
- the water content of the organic light emitting medium is considered to be 0.05% by weight or less.
- the organic luminescent medium and the interlayer insulating film are arbitrarily sampled as a mixture, and the weight A and weight B of these are measured.
- the moisture content calculated therefrom may be set to a value of 0.05% by weight or less.
- Figure 1 shows the relationship between the water content of an organic luminescent medium (which may partially include another organic film) and the rate of change in the luminescent region due to the occurrence of a non-luminescent region or a non-luminescent region.
- the horizontal axis indicates the water content (% by weight) of the organic light emitting medium, and the vertical axis indicates the change rate of the light emitting region (the area of the light emitting region or the area of the light emitting region after the occurrence of the non-light emitting region /
- the area of the light emitting region before the generation of the light emitting region or the non-light emitting portion is shown as the light emitting area ratio.
- Hata indicates the emission area ratio when the organic EL display device is left in a constant temperature bath at 80 ° C for 2 weeks, and ⁇ indicates the room temperature (25 ° C) in air.
- C) shows the ratio of the light emitting area when the organic EL display device is left under the condition for two weeks.
- the luminous area ratio does not change linearly with respect to the water content of the organic luminescent medium, and the water content exceeds 0.05 wt%. As a result, a phenomenon was observed in which the emission area ratio was significantly reduced.
- the water content of the organic luminescent medium to a value of 0.05 wt% or less, which has such a critical significance, it is possible to efficiently prevent a decrease in the luminescent area ratio.
- High emission luminance can be obtained over a long period of time by suppressing the occurrence of a non-light-emitting region or a non-light-emitting portion.
- the light-emitting area ratio tends to be smaller in a constant temperature bath at 80 ° C for 2 weeks than in air at room temperature (25 ° C) for 2 weeks.
- the water content exceeded 0.05% by weight, the phenomenon that the luminous area ratio was remarkably reduced was observed under any of the standing conditions.
- the organic luminescent medium by limiting the water content of the organic luminescent medium to 0.05% by weight or less, it is possible to not only leave the medium at room temperature (25 ° C) for two weeks, but also This means that the generation of a non-light-emitting area or a non-light-emitting area can be significantly suppressed even in a constant-temperature bath for two weeks. Therefore, when the organic EL display device is used under high-temperature conditions, it is more useful to set the water content to a value of 0.05% by weight or less.
- the method for forming the organic luminescent medium is not particularly limited, but includes, for example, a vacuum deposition method, a spin coating method, a Langmuir-Projet method (LB method: Langumuir-Blodgett method), an inkjet method, a micellar electrolytic method, and the like.
- LB method Langmuir-Projet method
- inkjet method a micellar electrolytic method
- micellar electrolytic method a generally known method can be employed.
- the anode layer corresponds to the lower electrode or the counter electrode depending on the configuration of the organic EL display device, but the anode layer has a large work function (for example, 4. O eV or more) metals, alloys, and electrically conductive compounds. Alternatively, it is preferable to use a mixture thereof. Specifically, indium tin oxide (ITO), indium zinc oxide (iota Zetaomikuron), strike opening Nchiumu Dosani ⁇ (S RCU 2 ⁇ 2), tin oxide (Sn_ ⁇ 2), zinc oxide (Zn_ ⁇ ), Gold, platinum, palladium, etc. It is preferable to use two or more materials in combination.
- ITO indium tin oxide
- iota Zetaomikuron indium zinc oxide
- strike opening Nchiumu Dosani ⁇ (S RCU 2 ⁇ 2) tin oxide (Sn_ ⁇ 2), zinc oxide (Zn_ ⁇ ), Gold, platinum, palladium, etc. It is preferable to use
- anode layer having a uniform thickness can be formed by using a method capable of forming a film in a dry state such as an organic chemical vapor deposition) or a plasma CVD method.
- the anode layer When EL light is extracted from the anode layer, the anode layer needs to be a transparent electrode. In that case, IT_ ⁇ , I ZO, S RCU 2 ⁇ 2, Sn_ ⁇ 2, using a conductive transparent material such as Zn_ ⁇ , the transmittance of EL emission to a value of 10% or more favorable preferable .
- the thickness of the anode layer is not particularly limited, but is preferably in the range of 10 to 1000 nm, more preferably in the range of 10 to 200 nm.
- the reason for this is that by setting the thickness of the anode layer to a value within this range, a uniform film thickness distribution and a transmittance of EL light emission of 10% or more can be obtained, while the sheet resistance of the anode layer is reduced. This is because the value can be set to 1000 or less, more preferably, 100 ⁇ or less.
- an anode layer lower electrode
- an organic luminescent medium organic luminescent medium
- a cathode layer counter electrode
- the lower electrode and the counter electrode are arranged in an XY matrix. It is also preferable to make any pixel on the light emitting surface emit light. That is, by configuring the anode layer and the like in this manner, various information can be easily displayed in the organic EL display device.
- the anode layer (lower electrode) or the cathode layer (counter electrode) is formed in dots, and as shown in Fig. 7, switching elements such as TFTs (Thin Film Transistors) are arranged corresponding to each dot. It is also preferable to display various information by selectively emitting light from each dot.
- TFTs Thin Film Transistors
- the cathode layer in the organic EL display device also corresponds to the lower electrode or the counter electrode depending on the configuration of the organic EL display device, but has a small work function (for example, 4. (Less than O e V) It is preferable to use metals, alloys, electrically conductive compounds, or mixtures or inclusions thereof.
- sodium, sodium-potassium alloy, cesium, magnesium, lithium, magnesium-silver alloy, aluminum, aluminum oxide, aluminum-monolithium alloy, indium, rare earth metal, these metals and organic luminescent medium materials It is preferable to use a single electrode material consisting of a mixture of these and a mixture of these metals and the material of the electron injection layer, or to use a combination of two or more of these electrode materials.
- the thickness of the cathode layer is not particularly limited as in the case of the anode layer, but it is specifically preferable that the thickness be in the range of 10 to 100 nm. More preferably, the value is in the range of 0 to 200 nm.
- the cathode layer when extracting EL emission from the cathode layer, the cathode layer must be a transparent electrode.
- the transmittance of EL emission is preferably set to a value of 10% or more.
- the cathode layer is preferably formed by a method capable of forming a film in a dry state such as a vacuum evaporation method or a sputtering method.
- the supporting substrate in the organic EL display device preferably has excellent mechanical strength and low permeability to moisture and oxygen.
- a glass plate, a metal plate, a ceramic plate, or a plastic plate polycarbonate resin, acrylic resin
- a support substrate made of these materials is further subjected to a moisture-proof treatment or a hydrophobic treatment by forming an inorganic film or applying a fluororesin in order to prevent moisture from entering the organic EL display device. Is preferably applied.
- the hydrous rate of the support substrate 0.0 0 0 1 1 wt% or less and the value of gas permeability coefficient X 1 0- 1 3 cc * c It is preferable to set the value to not more than mcm 2 ⁇ sec.cmHg.
- the interlayer insulating film (electric insulating film) in the organic EL display device of the present invention is present on the periphery or the periphery of the organic EL device, thereby improving the definition of the organic EL display device and preventing a short circuit between the lower electrode and the upper electrode of the organic EL device. Or, when driving an organic EL display device by using a TFT (thin film transistor), it is used for protecting the TFT and flattening the lower electrode of the organic EL element.
- TFT thin film transistor
- the interlayer insulating film may be referred to as a partition wall, a spacer, a flattening film, or the like, if necessary, and the present invention includes these.
- a first interlayer insulating film 15 and a second interlayer insulating film provided thereover are provided. (It may be referred to as a partition wall.) It is preferable that the partition is composed of 16.
- the organic light-emitting medium is composed of the first interlayer insulating film 15 and the second interlayer insulating film 16, and is provided so that the organic light-emitting medium 4 is arranged in a matrix and configured as the pixel 14.
- an interlayer insulating film 3 is provided to protect the TFT.
- the materials used for the interlayer insulating film are usually acrylic resin, polycarbonate resin, polyimide resin, fluorinated polyimide resin, benzoguanamine resin, melamine resin, cyclic polyolefin, nopolak resin, polyvinyl citrate, cyclized resin. Rubber, polyvinyl chloride resin, polystyrene, phenol resin, alkyd resin, epoxy resin, polyurethane resin, polyester resin, maleic acid resin, polyamide resin, and the like.
- acrylic resin polyimide resin, fluorinated polyimide, cyclic polyolefin, and epoxy resin are preferable.
- These insulating films are processed into a desired pattern by a photolithography method by introducing a photosensitive group, or processed into a desired pattern by a printing method.
- a photolithography method by introducing a photosensitive group
- a printing method for introducing a photosensitive group
- the respective configurations will be described separately for the first interlayer insulating film and the second interlayer insulating film that constitute the interlayer insulating film.
- the first interlayer insulating film is formed, for example, by laminating a photo-hardening resin on the lower electrode of the stripe pattern, and then performing photolithography so as to form a stripe pattern orthogonal to the pattern of the lower electrode. Preferably, it is formed.
- the stripe width of the first interlayer insulating film and the gap width and film thickness between adjacent stripes depend on the size of a desired pixel (light-emitting region).
- the gap width is preferably in the range of 5 to 300 m
- the film thickness is preferably in the range of 0.01 to 50 m.
- the electric insulation of the first interlayer insulating film is preferably set to a value of 1 ⁇ 10 6 ⁇ ⁇ cm or more as a volume resistance (voltage 1 ⁇ , frequency 100 Hz applied measurement), and 1 ⁇ 10 8 to 1 More preferably, the value is in the range of 10 12 ⁇ ⁇ cm. In addition, it is preferable that the electric insulation is set to the same value for a second interlayer insulating film described later.
- the second interlayer insulating film for example, after laminating a photocurable resin from above the first interlayer insulating film, using a photolithography method, a partition is formed on the first interlayer insulating film. Can be formed.
- the thickness is set to a value within a range of 150 to 150 m
- the gap width is set to a value of 10 to 500 m
- the film thickness is set to a value of 0.5 to 50 m.
- the second interlayer insulating film preferably has an inverted trapezoidal cross section as shown in FIG. 6 by controlling the exposure conditions and the etching conditions. With this configuration, while the area of the light emitting region can be increased, the electrical insulation between the adjacent upper electrodes can be more reliably maintained. (4)-3 Moisture content
- the water content of the interlayer insulating film is preferably set to a value of 0.05% by weight or less, more preferably to a value of 0.03% by weight or less, like the organic luminescent medium. It is more preferable to set the value to 01% by weight or less.
- the moisture content of the interlayer insulating film exceeds 0.05% by weight, the contained moisture promotes the oxidative deterioration of the upper electrode and the organic luminescent medium, so that a non-luminescent region or a non-luminescent portion is easily generated. This is because it may be.
- the moisture content of the interlayer insulating film can be measured in the same manner as the moisture content of the organic luminescent medium.
- the fluorescent medium in the organic EL display device has a function of absorbing light emitted from the organic EL element to emit fluorescent light having a longer wavelength, and is configured as a layered material which is separated and arranged in a plane. It is preferable that each fluorescent medium is arranged corresponding to a light emitting region of the organic EL element, for example, a position of an intersection of a lower electrode and an upper electrode. With this configuration, when the organic light emitting layer emits light at the intersection of the lower electrode and the upper electrode, each fluorescent medium receives the light and emits light of a different color (wavelength) to the outside. It becomes possible.
- the organic EL element emits blue light and the fluorescent medium converts or partially transmits green and red light, even if one organic EL element is used, the three primary colors of blue, green, and red light can be achieved. This is preferable because full power display is possible.
- a light-blocking layer black matrix
- each fluorescent medium may be provided between each fluorescent medium to block light emitted from the organic EL element and light from each fluorescent medium, thereby improving contrast and reducing viewing angle dependency. preferable.
- the fluorescent medium may be configured by combining or mixing with a color filter described later in order to prevent a decrease in contrast due to external light.
- the fluorescent medium is composed of, for example, a fluorescent dye and a resin, or only a fluorescent dye, and When it is composed of an optical dye and a resin, the fluorescent dye can be obtained by dissolving or dispersing the fluorescent dye in the pigment resin and the binder resin.
- 1,4-bis (2-methylstyryl) benzene is used as a fluorescent dye that converts the emission of organic EL elements from near-ultraviolet light to purple light into blue light emission.
- fluorescent dyes such as trans-1,4'-diphenylstilbene and coumarin dyes such as 7-hydroxy-4-methylcoumarin.
- a fluorescent pigment for converting the light emitted from a blue, blue-green or white light-emitting member to green light for example, 2,3,5,6-1H, 4H-tetrahydro-8-trifluoromethylquinolyl Zino (9, 9a, 1-gh) coumarin, 3— (2′-benzothiazolyl) —7—Jetylaminocoumarin (hereinafter, coumarin 6), 3— (2′-benzimidazolyl) Coumarin dyes such as 7-N, N-getylaminocoumarin; and naphthalimide dyes such as Basic Yellow 51, Solvent Yellow 11, Solvent Yellow 116, and the like.
- 4-dicyanomethylene-2-methyl-6- (p-dimethylaminostyryl) Cyanine dyes such as 1 H-pyran
- pyridine dyes such as 1-ethyl 2- (4- (p-dimethylaminophenyl) -1,3-butane genyl) -pyridinyl mover chloride
- various dyes can be selected as long as they have fluorescence.
- the fluorescent dye is kneaded in advance in a pigment resin such as polymethacrylic acid ester, polychlorinated biel, vinyl chloride vinyl acetate copolymer, alkyd resin, aromatic sulfonamide resin, urea resin, melamine resin, and benzoguanamine resin. It may be a cosmetic material.
- a pigment resin such as polymethacrylic acid ester, polychlorinated biel, vinyl chloride vinyl acetate copolymer, alkyd resin, aromatic sulfonamide resin, urea resin, melamine resin, and benzoguanamine resin. It may be a cosmetic material.
- these fluorescent dyes or pigments may be used alone or as a mixture as necessary.
- mixing for example, blue to blue-green light emission in the organic EL device can be converted to white light emission.
- concentration of fluorescent dye for example, a value in the range of 1 ⁇ 1 Cr 4 mo 1 / kg , preferably in the range from 0. 1 ⁇ 10- 3 mo l / kg the value of the inner, more preferably, is adjusted to a value within the range of 0. 05 ⁇ 10- 2 mo lZkg.
- the binder resin for example, a transparent material having a visible light transmittance of 50% or more is preferable.
- a transparent material include polymethyl methacrylate, polyacrylate, polycarbonate, polyvinyl alcohol, polypinyl pyrrolidone, hydroxyethyl cellulose, carboxymethyl cellulose, and the like.
- a photosensitive resin to which a photolithography method can be applied is preferably selected as the binder resin in order to separate and arrange the fluorescent medium in a plane.
- a photocurable resist material such as an acrylic acid resin, a methacrylic acid resin, a polyvinyl citrate resin, a cyclized rubber resin, or the like can be used.
- a printing ink (medium) using a transparent resin is selected.
- the binder resin polyvinyl chloride resin, melamine resin, phenol resin, alkyd resin, epoxy resin, polyurethane resin, polyester resin, maleic resin, polyamide resin, polymethyl methacrylate Resin, polyacrylate resin, polycarbonate resin, polyvinyl alcohol resin, polyvinyl pyrrolidone resin, hydroxyethyl cellulose resin, carboxymethyl cellulose resin, and the like.
- the water content of the fluorescent medium is preferably set to a value of 0.05% by weight or less, more preferably 0.03% by weight or less, and 0.01% by weight, similarly to the organic light emitting medium. More preferably, the following values are set.
- the water content of the fluorescent medium exceeds 0.05% by weight, the contained water promotes the oxidative deterioration of the upper electrode and the organic luminescent medium, and it is difficult to suppress the generation of a non-light emitting region or a non-light emitting area. This is because it may be.
- the water content of the fluorescent medium can be measured in the same manner as the water content of the organic luminescent medium.
- the fluorescent medium is mainly composed of a fluorescent dye
- the fluorescent medium is composed of a fluorescent dye and a resin
- the fluorescent dye, the resin and an appropriate solvent are mixed, dispersed or solubilized to form a liquid, and the liquid is spin-coated, roll-coated, or cast.
- the thickness of the fluorescent medium is not particularly limited as long as it does not interfere with the function of generating fluorescence while sufficiently receiving (absorbing) the light emitted from the organic EL element.
- the value is preferably in the range of 0.5 mm, more preferably in the range of 0.5 m to 1 mm, and even more preferably in the range of 1 m to 100 m.
- a color filter is provided to decompose or enhance light to improve color adjustment or contrast, and is a dye layer consisting of only a dye or a layered material formed by dissolving or dispersing a dye in a binder resin. Is configured as
- the color filter is preferably patterned using a printing method or a photolithography method, like the fluorescent medium.
- the composition of the color filter includes blue, green, and red pigments.
- Perylene pigments lake pigments, azo pigments, quinacridone pigments, anthraquinone pigments, anthracene pigments, isoindoline pigments, isoindolinone pigments, diketopyro pigments
- pigment or the like or a combination of two or more types may be mentioned.
- green (G) dye one or two or more kinds of octogen-substituted phthalocyanine pigments, halogen-substituted copper phthalocyanine pigments, triphenylmethane-based basic dyes, isoindrin-based pigments, isindolinone-based pigments, etc. Combinations.
- blue (B) dye examples include copper phthalocyanine pigments, indanthrone pigments, indophenol pigments, cyanine pigments, dioxazine pigments, and the like, alone or in combination of two or more.
- the concentration of the dye in the color filter is preferably within a range that allows patterning with high accuracy and allows sufficient transmission of light emitted from the organic light emitting layer. Therefore, depending on the type of the pigment, it is preferable that the pigment concentration in the color filter including the binder resin to be used is in the range of 0.5 to 50% by weight.
- the same material as the binder resin for the phosphor layer can be selected as the binder resin for the color filter, a detailed description thereof is omitted here.
- the water content of the color filter is preferably not more than 0.05% by weight, more preferably not more than 0.03% by weight, similarly to the organic luminescent medium. , 0.01% by weight or less.
- a photocurable resin or a thermosetting resin is preferable as a preferable polymer.
- oxide Gay element S i 0 2
- aluminum oxide A 1 2 ⁇ 3) titanium oxide (T I_ ⁇ 2)
- yttrium oxide Y 2 0 3
- germanium oxide GeO 2
- zinc oxide ZnO
- magnesium oxide MgO
- calcium oxide CaO
- boric acid B 2 0 3
- acid strontium S R_ ⁇
- Z R_ ⁇ 2 oxide barium
- PbO lead oxide
- Jill Konia Z R_ ⁇ 2
- sodium oxide Na 2 ⁇
- lithium oxide Li i 2 0
- potassium of acid K 2 0
- the composition only needs to mainly include an inorganic oxide, and may include an inorganic substance such as a nitride (for example, Si 3 N 4 ). Is also good.
- a glass plate can be given as a flattening layer made of an inorganic oxide.
- a glass plate soda-lime glass, barium strontium-containing glass, lead glass, aluminosilicate glass, borate glass, barium borate glass and the like are more preferable.
- the thickness of the flattening layer depends on the definition of the display, the unevenness of the fluorescent medium or color filter, but is preferably in the range of 10 nm to 1 mm. The reason for this is that with such a configuration, the unevenness of the fluorescent medium or the color filter can be sufficiently flattened, and the viewing angle dependency of the high definition display can be reduced.
- the thickness of the planarizing layer is set to 100 ⁇ !
- the value is more preferably in the range of 100 to 100 m, and even more preferably in the range of 100 nm to 10 m.
- the flattening layer is provided so as to cover the fluorescent medium or the color filter, has a light transmittance of 50% or more at 400 nm to 700 nm, and is an electrically insulating layer. Is preferred.
- the moisture content of the flattening layer is preferably set to 0.05% by weight or less, more preferably 0.03% by weight or less, and particularly preferably 0.01% by weight or less. preferable.
- the moisture content of the planarizing layer exceeds 0.05% by weight, the contained moisture promotes the oxidative deterioration of the upper electrode and the organic luminescent medium, so that the generation of a non-luminescent region or a non-luminescent portion is suppressed. This is because it may be difficult.
- the gas permeability coefficient of water vapor or oxygen flat I ⁇ layer respectively 1 X 10_ 12 cc ⁇ cm / cm 2 ⁇ s ⁇ cmHg or less preferably to a value, and even more preferably to a 1 X 10- 13 cc ⁇ cm / cm 2 's ⁇ cmHg or less value.
- the flattening layer is formed by a method such as spin coating, casting, or screen printing, or by a method such as sputtering, vapor deposition, chemical vapor deposition (CVD), or ion plating. It is preferable to form a film.
- the sealing member in the organic EL display device is provided around the organic EL display device in order to prevent moisture from entering into the inside, or the sealing member provided in this manner is provided with an organic EL display. It is preferable to seal a known sealing medium, for example, an inert liquid such as a desiccant, dry gas, or fluorocarbon, between the device and the device. Such a sealing member can also be used as a supporting substrate when a fluorescent medium or a color filter is provided outside the upper electrode.
- a sealing medium for example, an inert liquid such as a desiccant, dry gas, or fluorocarbon
- the same kind of material as the supporting substrate for example, a glass plate or a metal plate can be used.
- the form of the sealing member is not particularly limited, and for example, is preferably in a plate shape or a cap shape.
- its thickness is preferably set to a value within the range of 0.01 to 5 mm.
- the sealing member is provided in a groove or the like in a part of the organic EL display device, and it is preferable that the sealing member is press-fitted and fixed in the groove, or that the organic EL display is formed by using a light-curing adhesive or the like. It is also preferable to fix to a part of the display device.
- the organic EL display device of the present invention can be constituted by basically combining the above-mentioned components, it is also preferable to combine other components, for example, a hole injection layer or an electron injection layer.
- a configuration example of a typical organic EL display device is shown below, but the present invention is not limited to this.
- FIGS. 4 and 10 show an organic EL display device having the structure (1), an organic EL display device having the structure (1) or (2), and an organic EL display device having the structure (3) or (4), respectively.
- the second embodiment relates to a method for manufacturing an organic EL display device having a configuration shown in FIG. 3 (or FIG. 9) and the like, and includes the following first to third steps.
- a dehydration step is provided as a second step to dehydrate the support substrate and the like.
- the organic EL display device is passed through the third step.
- the water content of the organic luminescent medium (or the mixture of the organic luminescent medium, the color filter, the fluorescent medium, the planarizing layer, and the interlayer insulating film) is set to a value of 0.05% by weight or less. .
- the second embodiment is characterized in that an organic EL display device is manufactured by using the manufacturing apparatus 20 shown in FIG. 11, and specifically, a film forming unit (vacuum evaporation apparatus) 22 After the support substrate is dehydrated using the dewatering unit 21 connected to the substrate, the supporting substrate is transferred to the film forming unit 22 by the transfer device 25 in the transfer unit 24, and the organic light emission is performed. It is characterized by forming a medium.
- the first step is a step before the formation of the organic light emitting medium, and includes at least a step of forming the lower electrode, depending on the configuration of the organic EL display device.
- the process of forming the lower electrode on the support substrate, the process of forming the first and second interlayer insulating films or the TFT substrate, or the process of forming the fluorescent medium, the color filter, and the flattening film are performed by vapor deposition and photolithography, respectively. It is preferable to carry out the combination of lithography and the like.
- the second step is a step of dehydrating moisture from an organic film such as a color filter on a supporting substrate, a fluorescent medium, the first and second interlayer insulating films, or an interlayer insulating film on the TFT substrate.
- an organic film such as a color filter on a supporting substrate, a fluorescent medium, the first and second interlayer insulating films, or an interlayer insulating film on the TFT substrate.
- the second step is preferably performed in a dehydration unit of a manufacturing apparatus described later.
- the dew point around the supporting substrate and the like to be treated in the dehydrating step is set to a value of ⁇ 10 ° C. or less, and the supporting substrate and the like are subjected to a dehydrating treatment.
- the reason for this is that if the dew point exceeds -10 ° C, the dewatering efficiency may be significantly reduced.
- the dew point in the dehydration step is more preferably set to a value of ⁇ 50 ° C. or less, and further preferably the dew point is set to a value in the range of ⁇ 50 ° C. to ⁇ 150 ° C.
- the dew point in the dehydration process is controlled by introducing inert gas and controlling the temperature inside the dehydration unit. This makes it easier to adjust the amount of water in the dehydration unit while monitoring the dew point meter.
- the dehydration time affects the area and film thickness of the color filter, the fluorescent medium, the first and second interlayer insulating films, the capacity of the dewatering unit, and the like.
- the dehydration time is preferably set to a value within a range of, for example, 10 minutes to 40 hours.
- the reason for this is that if the dehydration time is less than 10 minutes, the dehydration treatment may be insufficient, making it difficult to reduce the water content of the assembled organic luminescent medium to 0.05% by weight or less. Because there is. On the other hand, if the dehydration time exceeds 40 hours, the effect obtained may not be changed, but only the treatment time becomes longer.
- the dehydration time is more preferably set to a value within a range of 30 minutes to 24 hours, and even more preferably set to a value within a range of 1 to 12 hours.
- the dehydration method for adjusting the dew point is a particularly effective method when an organic light emitting medium is formed by wet film formation as described in the third embodiment. This is an effective method even when the film is formed in a dry (dry) state. In other words, when the film is formed in a dry state, the amount of water in the organic luminous medium is very small. Therefore, if the water in the supporting substrate or the interlayer insulating film thereon is removed, oxidative deterioration can be suppressed. According to the dehydration method for adjusting the dew point, the organic light-emitting medium is less likely to deteriorate in the dehydration step, and thus it can be said that the method is effective even when wet film formation is not performed.
- the degree of vacuum in the dehydration step is set to a value of 13.3 Pa (0.1 Torr) or less. The reason for this is that if the degree of vacuum exceeds 13.3 Pa (0.1 lTorr), the dehydration efficiency may be significantly reduced.
- the heating of the supporting substrate and the like can be reduced, The deterioration of the light emitting medium and the fluorescent medium is reduced, and dehydration can be performed in a short time.
- the reason for this is that if the dehydration time is less than 10 minutes, the dehydration treatment becomes insufficient and it becomes difficult to reduce the water content of the assembled organic luminescent medium to 0.05% by weight or less. Because there is a case. On the other hand, even if the dehydration time exceeds 30 hours, the effect obtained may not be changed just by increasing the processing time.
- the dehydration time is more preferably set to a value within a range of 30 minutes to 20 hours, and even more preferably set to a value within a range of 1 to 10 hours.
- an inert gas such as helium, argon, or nitrogen
- Nitrogen is used because the production cost is reduced. Is more preferred.
- an inert gas is preferable because a dehydration treatment can be performed while suppressing reaction and oxidation of an organic layer containing an organic light emitting medium, a cathode, and the like.
- the inert gas is subjected to a dehydration treatment in advance.
- the dehydration time for the dehydration treatment with an inert gas is determined by the flow rate of the inert gas, the area and thickness of the color filter, the fluorescent medium, the first and second interlayer insulating films, or the dehydration unit.
- the dehydration time is preferably, for example, set to a value within a range of 10 minutes to 40 hours, although it is affected by the volume and the like.
- the dehydration time is less than 10 minutes, the dehydration treatment becomes insufficient and This is because it may be difficult to reduce the water content of the organic light-emitting medium after the filling to 0.05% by weight or less.
- the dehydration time exceeds 40 hours, the effect obtained may not be changed just by increasing the processing time.
- the dehydration time is more preferably set to a value within a range of 30 minutes to 24 hours, and even more preferably set to a value within a range of 1 to 12 hours.
- the heating temperature in the dehydration step is preferably set to a value within a range of 60 to 300 ° C.
- the reason for this is that if the heating temperature is lower than 60 ° C, the dehydration efficiency may be significantly reduced, while if the heating temperature is higher than 300 ° C, an organic luminescent medium or a fluorescent medium may be used. This is because the organic film may be thermally damaged.
- the heating temperature in the dehydration step it is more preferable to set the heating temperature in the dehydration step to a value in the range of 100 to 250 ° C.
- the heating temperature of the dehydration step in consideration of the storage environment or driving environment of the organic EL display device. That is, by pre-processing at a temperature higher than the temperature in the storage environment or the driving environment, and more preferably at least 10 ° C higher than the temperature, the non-light-emitting area or the non-light-emitting area in the storage environment or the driving environment The occurrence of locations can be suppressed.
- the dehydration time in the case of dehydration treatment by heating is affected by the area and film thickness of the color filter, the fluorescent medium, the first and second interlayer insulating films, and the like.
- the value is in the range of minutes to 12 hours.
- the reason for this is that if the dehydration time is less than 10 minutes, the dehydration treatment becomes insufficient, making it difficult to reduce the water content of the organic luminescent medium after assembly to 0.05% by weight or less. Because there is. On the other hand, if the dehydration time exceeds 12 hours, the effect obtained may not be changed just by increasing the processing time.
- the dehydration time is more preferably set to a value within a range of 30 minutes to 10 hours, and even more preferably set to a value within a range of 1 to 6 hours.
- Combining the two or more dehydration treatment conditions described above may also increase the dehydration time. It is more preferable because it can be shortened.
- the organic light emitting medium when the organic light emitting medium is formed into a film in a dry state, before forming the organic light emitting medium, a temperature of 30 ° C., a dew point of 50 ° C., a dry nitrogen atmosphere, and a heating temperature of 60 ° C. for a supporting substrate are used.
- a temperature of 30 ° C., a dew point of 50 ° C., a dry nitrogen atmosphere, and a heating temperature of 60 ° C. for a supporting substrate are used.
- the dehydration treatment for 3 minutes to 3 hours the water content of the supporting substrate and the like can be sufficiently removed, and the water content of the assembled organic luminescent medium can be easily adjusted to a value of 0.05 wt% or less.
- the organic EL display device is manufactured by laminating a sealing member provided with a fluorescent medium or the like, it is also preferable that in the second step, the organic EL element layer and the sealing member are each dehydrated.
- the water content of the organic light emitting medium after assembly is 0.05% by weight or less. It becomes easier to set the value, and it is possible to further suppress the occurrence of a non-light emitting region or a non-light emitting portion.
- the supporting substrate and the like be kept out of contact with the atmosphere before moving to the third step.
- the time is preferably set to a value of less than 10 minutes, more preferably, to a value of less than 5 minutes. It is to be. This is because if the support substrate or the like is exposed to the atmosphere for more than 10 minutes after the dehydration treatment, the support substrate or the like may absorb or absorb water in the air again.
- the third step is a step of forming an organic light emitting medium, a step of forming an upper electrode, or a sealing step.
- the step of forming the organic light emitting medium and the step of forming the upper electrode are preferably performed in a film forming unit described later. Specifically, film formation in a dry state such as a vacuum evaporation method or a sputtering method is possible. It is preferable to form using a method.
- the sealing step is preferably performed by enclosing a desiccant, a dry gas, or the like and laminating a sealing member in a sealing unit described later.
- the organic EL display device manufacturing apparatus has a dehydration unit (dehydration unit) for reducing the water content of the organic luminescent medium to a predetermined value or less in order to easily and efficiently manufacture an organic EL display device with excellent reliability. Is preferred.
- the manufacturing apparatus includes a film forming unit 22, a dewatering unit 21, a sealing unit 23, and a transport unit 24. It is preferable that the unit 21 is connected to the film forming unit 22 and the sealing unit 23 via a transfer unit 24 including a gate valve 26 and a transfer device 25 therein.
- the dehydration unit 21 includes, for example, a housing 32, a substrate stage 33 for mounting the support substrate 1 and the like, and a hot stage. It was equipped with a plate 34 (including a cooling device), dry gas circulation devices 35 and 36, a dew point meter 30 and, if necessary, a fully automatic moisture absorption / desorption measuring device shown in Fig. 18. This is the configuration of the dry box.
- a transfer unit 24 including a gate valve and a transfer device is provided on the side of the dewatering unit 21, and a film formation unit (not shown) and a sealing unit are provided via the transfer unit 24. It is preferably connected to a stop unit (not shown).
- FIG. 14 Another embodiment of the dehydration unit 21 is shown in FIG. 14.
- a transfer unit 24 including a gate valve and a transfer device is provided in the unit.
- the transfer unit 24 is connected to a film forming unit (not shown) and a sealing unit (not shown) via the transfer unit 24.
- the housing 32 is a member for accommodating the support substrate 1 and the like to be dehydrated and the substrate stage 33, and the substrate stage 33 is a member for dehydrating. For fixing the supporting substrate 1 and the like.
- the hot plate 34 and the cooling device are provided below the substrate stage 33, or the substrate stage itself is a hot plate, and the temperature of the supporting substrate 1 or the like is adjusted (heating or cooling) to perform dehydration. It is a member. In addition, since heating can be performed in a shorter time, it is preferable to provide another heating jig such as an infrared lamp instead of the hot plate or together with the hot plate. Further, the dry gas circulating devices 35 and 36 are provided for dehydrating by introducing an inert gas while adjusting the dew point by the dew point meter 30, and in the example shown in FIG. An inert gas inlet 35 is provided, and an inert gas outlet 36 is provided above the side surface.
- the inert gas is applied to the supporting substrate fixed to the substrate stage in the housing using a dry gas circulation device, for example, at a flow rate of 10 liters Z. It is preferable to perform the dewatering treatment for a predetermined time while spraying under the conditions of minutes and confirming that the dew point becomes a value of ⁇ 10 ° C. or less with a dew point meter.
- the supporting substrate is controlled to a predetermined temperature, for example, a value within the range of 60 ° C to 30 by using a hot plate or a cooling device provided below the substrate stage. Then, it is also preferable to carry out a dehydration treatment.
- a dehydration treatment for example, a value within the range of 60 ° C to 30.
- the degree of vacuum in the housing is reduced to, for example, a value of 13.3 Pa (0.lTo rr) or less, more preferably 0, using the vacuum pump 38. . adjusted to 00133P a (1 X 10- 5 to rr) the following values, it is preferable to perform the predetermined time dehydrated.
- a quadrupole mass spectrometer Q-Mass
- a fully automatic moisture absorption / desorption measuring device not shown
- the collection of the organic luminescent medium can be performed manually or automatically using a transfer device.
- the organic EL display device it is not necessary to collect the organic luminescent medium.
- the water content of the organic light emitting medium or the water content of the organic film containing the organic light emitting medium can be roughly grasped.
- the weight before drying (: and the weight D after drying) of the organic luminous medium or the organic film containing the organic luminous medium including the supporting substrate and the like are measured with a precision balance of a fully automatic moisture absorption / desorption measuring device.
- the weight E of the support substrate other than the organic luminescent medium, etc., or the weight E of the support substrate other than the organic film containing the organic luminescent medium, which has been measured in advance using a precision balance From the following equation (2), the water content (W) of the organic luminescent medium or the organic film containing the organic luminescent medium can be estimated.
- a film forming unit and a sealing unit are connected to the transfer unit connected to the dehydration unit, and a transfer mechanism provided therebetween, for example, is rotatably supported, has a gripping portion at the tip, and further expands and contracts.
- a flexible robot arm transfers supporting substrates, etc., from the dewatering unit to the film-forming unit and sealing unit without touching the atmosphere, or from the film-forming unit to the dewatering unit and sealing unit, respectively. It is configured to be able to.
- the organic light emitting medium After forming the organic light emitting medium, the organic light emitting medium is transferred from the film forming unit to the sealing unit, and the surroundings are sealed with a sealing member, so that the organic EL display device can be assembled. Can be easily controlled to a value within a predetermined range.
- an organic EL display device capable of preventing a decrease in the light emission area ratio due to the occurrence of a non-light emitting region or a non-light emitting portion, and efficiently producing an organic EL display device capable of obtaining high light emission luminance over a long period of time. can do.
- the dewatering unit 21, the film forming unit 22, and the sealing unit 23 are provided with the gate valve 26 in the horizontal direction.
- the two transfer units 24 are provided on both sides of the arrangement.
- the supporting substrate and the like are moved between the dehydrating unit 21, the film forming unit 22, and the sealing unit 23. Accordingly, the organic EL display device can be moved without being exposed to the atmosphere, and an organic EL display device including an organic luminescent medium having a water content of not more than a predetermined value can be efficiently manufactured.
- the third embodiment is another embodiment relating to a method for manufacturing an organic EL display device, and includes first to third steps described below.
- the organic light-emitting medium is formed into a wet film in the first step, and in the second step, a dehydration step is provided after the formation of the organic light-emitting medium to dehydrate the organic light-emitting medium.
- the water content of the organic light emitting medium (or the mixture of the organic light emitting medium, the color filter, the fluorescent medium, the planarizing layer, and the interlayer insulating film) in the organic EL display device obtained through the step is 0.05 wt. % Or less.
- the water content of the organic light emitting medium can be reduced in the finally assembled organic EL display device. It can be easily reduced to a value of 0.05% by weight or less.
- the first process is a process up to the formation of the organic light emitting medium, which includes a fluorescent medium, a magnetic filter, a planarizing film, a lower electrode, a first and a second interlayer insulating film, or a TFT substrate (interlayer insulating film). ), An organic light emitting medium forming step, and the like.
- the step of forming the oxide film is preferably performed by using a photolithography method.
- the step of forming the organic luminescent medium is performed by wet film formation. Specifically, it is preferable to employ a spin coating method, a Langmuir-Blodgett method (LB method), an ink-jet method, a micelle electrolytic method, or the like.
- LB method Langmuir-Blodgett method
- ink-jet method a micelle electrolytic method, or the like.
- the second 'step is a step of dehydrating the wet-formed organic light emitting medium, and the processing conditions of the dehydration step can be substantially the same as those in the second embodiment.
- dehydration from an organic luminous medium can be performed efficiently by (1) adjusting the dew point, (2) adjusting the degree of vacuum, (3) introducing an inert gas, (4) heating alone, or combining two or more of these dehydrating processes.
- the dehydration method for adjusting the dew point is particularly effective for wet-formed organic light-emitting media.
- the organic light emitting medium when the organic light emitting medium is formed by wet film formation, a large amount of water is contained in the organic light emitting medium, and other dehydration treatment methods, such as a heat treatment method, do not deteriorate the organic light emitting medium and contain water. This is because it may be difficult to control the rate to a value within a predetermined range.
- the organic luminescent medium When the organic luminescent medium is not wet-formed but is formed in a dry (dry) state such as vacuum evaporation, the organic luminescent medium has a very small amount of water, and thus the supporting substrate or an interlayer insulating film thereon is required. If moisture in the film is removed, oxidative deterioration can be suppressed. That is, before the organic luminescent medium is formed, the dew point is controlled to a value of 110 ° C or less, and only the dehydration treatment of the support substrate and the like allows the water content of the assembled organic luminescent medium to be reduced. It can be controlled to a value within a predetermined range.
- the dehydration method for adjusting the dew point is an effective method even when wet film formation is not performed since there is no possibility that the organic luminescent medium is deteriorated in the dehydration step.
- the third step is a step after the formation of the organic luminescent medium.
- the upper electrode is formed by vacuum deposition in a film forming unit, and in the sealing step, the sealing unit is used to form an organic light emitting medium or the like using a sealing member. It is preferable to cover the periphery.
- a 130 nm-thick ITO film was entirely formed by a sputtering method on a glass substrate (OA2 glass, manufactured by Nippon Electric Glass Co., Ltd.) with a length of 112 mm, a width of 143 mm and a thickness of 1.1 mm.
- a positive resist HPR204 (manufactured by Fuji Hunt Electronics Technology Co., Ltd.) was spin-coated on this ITO film, and dried at 80 ° C for 15 minutes.
- contact exposure was performed using a high-pressure mercury lamp as a light source through a photomask having a stripe pattern (line width 90 m, gap width 20 m) so that the exposure amount was 100 mJ / cm 2 .
- Development was performed using TMAH (tetramethylammonium hydroxide) as a developer.
- the ITO film was etched using a hydrobromic acid aqueous solution (concentration: 47% by weight) as an etchant.
- the positive resist was removed using stripping solution N303 (manufactured by Nagase & Co., Ltd.) to form a striped ITO pattern (960 lines) as an anode (lower electrode).
- an acrylic acid-based negative resist V259 ⁇ (manufactured by Nippon Steel Chemical Co., Ltd.) is spin-coated on the IT ⁇ pattern, dried at a temperature of 80 ° C for 15 minutes, and the ITO is reduced to 70%.
- Contact exposure was performed using a high-pressure mercury lamp as a light source through a photomask that was exposed in a rectangular shape of m (exposure amount: 30 0m J Zcm
- TMAH TMAH
- post-baking was performed using an oven at a temperature of 160 ° C. to form a first interlayer insulating film.
- a nopolak resin-based negative resist ZP N1100 manufactured by Zeon Corporation was spin-coated. After drying under the conditions of a temperature of 80 ° C and a time of 15 minutes, a strip-shaped pattern (line width 20 mm, gap width 310 im) perpendicular to the ITO pattern as the lower electrode is passed through a photomask. Then, contact exposure was performed using a high-pressure mercury lamp as a light source (exposure amount: 7 OmJ / cm 2 ), and baking was performed at a temperature of 90 ° C for 15 minutes.
- TMAH TMAH
- the glass substrate on which the ITO pattern and the like are formed (hereinafter, may be simply referred to as a glass substrate) is subjected to isopropyl alcohol cleaning and ultraviolet cleaning, and then the glass substrate is subjected to a dehydration step.
- a dehydration unit for the purpose. That is, the glass substrate was housed in a dry box provided with an inert gas (helium, argon, nitrogen, etc.) circulation section, a dew point control section, and a heating device section (hot plate).
- inert gas helium, argon, nitrogen, etc.
- the glass substrate in the dry box is heated to 60 ° C using a hot plate, and while introducing dry nitrogen in that state, the dew point is lowered to ⁇ 50 ° C, and the glass substrate is left for about 2 hours.
- the moisture in the first and second interlayer insulating films and the moisture adhering to the glass substrate surface and the like were removed.
- Hole injection materials 4,4 ', 4' '-tris [N— (3-methylphenyl) -N-phenylamino] triphenylamine (MTDATA) and 4,4'-bis [N— (1— Naphthyl) -N-phenylamino] -biphenyl (NPD), organic luminescent material: 4,4'-bis (2,2-diphenylvinyl) biphenyl (DPVB i)
- Electron injection material Tris (8-quinolinol) aluminum (A 1 Q)
- an A1-Li alloy (Li concentration: 10 atm%) was attached to a Yungsten filament.
- the degree of vacuum of the vacuum evaporation apparatus was reduced to 665 X 10_ 7 Pa (5 X 10 " 7 To rr). From the hole injection layer to the formation of the cathode, the following evaporation rate and film thickness were obtained. The layers were stacked by a single evacuation without breaking the vacuum on the way to form an organic luminescent medium.
- MTDATA deposition rate 0.1 to 0.3 nmZse c., Film thickness 60 nm
- NPD evaporation rate 0.1 to 0.3 nm / sec, film thickness 20 nm
- DPVB i evaporation rate 0.1 to 0.3 nm / sec, thickness 50 nm
- a 1 q Deposition rate 0.1 to 0.3 nm / sec, thickness 20 nm
- a 1 -L i Deposition rate 0.5 to 1.0 nm / sec, thickness 150 nm
- a glass substrate for sealing (blue plate glass, manufactured by Geomatech Co., Ltd.) is laminated on the cathode side in a sealing unit into which dry nitrogen has been introduced, and the periphery thereof is covered with a light-curing adhesive TB3102 (slip).
- the organic EL display device for measuring light emission performance shown in Fig. 2 was obtained.
- an organic EL display device for measuring the water content and an organic EL display device for the durability test were respectively manufactured.
- the obtained organic EL display device is decomposed in a dry box in which dry nitrogen is continuously introduced, and an organic light emitting medium (partially including an interlayer insulating film. The same applies hereinafter) using a spatula. And its weight was measured using an automatic moisture absorption / desorption measuring device IGA SORP (manufactured by Hiden, UK) provided in the dry box. As a result, the weight A of the collected organic luminescent medium was 43.9194 mg / kg.
- the collected organic luminescent medium was subjected to a heat treatment in a dry box at 8.0 ° C. for 30 minutes, and the weight after the treatment was measured using the above-described fully automatic moisture absorption / desorption measuring device.
- the weight B of the organic luminescent medium after the heat treatment was 43.919 Omg.
- the obtained weight A and weight B were introduced into the above equation (1) to calculate the water content (W (%)) of the organic light emitting medium.
- the water content (W) of the organic light emitting medium was 0.0009% by weight.
- removing the moisture from the surface of the support substrate and the first and second interlayer insulating films by providing a dehydration step before forming the organic light emitting medium reduces the water content of the organic light emitting medium. It turned out to be an effective means for
- a voltage of 10 V DC was applied between the lower electrode (ITO pattern, anode) of the obtained organic EL display device and the upper electrode (cathode) as the counter electrode, and the intersection of each electrode was measured.
- the pixels (approximately 230,000 pixels) emitted light.
- the emission luminance was measured using a color difference meter CS 100 (manufactured by Minoru Yu Co., Ltd.), and a value of 300 cd / m 2 was obtained.
- the aperture ratio which is the ratio of the pixel area when the total area of the light emitting surface was 100%, was 56%.
- the obtained two sets of organic EL display devices were tested under the conditions of air, room temperature (25), and Each was left at 80 ° C for 2 weeks in a warm bath. Thereafter, each pixel of the organic EL display device is caused to emit light under the above-described voltage conditions, and no light-emitting region or a non-light-emitting portion is generated. The area was measured, and the durability was evaluated by comparing the area with the area of the light emitting region before leaving. In addition, the emission luminances of the two sets of the organic EL display devices after being left for two weeks were similarly evaluated.
- the area of the light emitting region before leaving is 1 and if the device is left in the air at room temperature (25 ° C) for 2 weeks, the area of the light emitting region after leaving is 0.98 When left in a constant temperature bath at 80 ° C. for 2 weeks, the area of the light emitting region after leaving was 0.97.
- the emission luminance at this time was 294 cd / m 2 at room temperature and 291 cdZm 2 at 80 ° C.
- the water content in the organic luminescent medium by setting the water content in the organic luminescent medium to a value equal to or less than the predetermined value (0.05% by weight), it can be used not only in the atmosphere, at room temperature (25 DC ), but also in a high temperature environment of 80 ° C. It was also found that the reduction of the light emitting area due to the generation of a non-light emitting area or a non-light emitting portion over a long period of time can be suppressed, and a decrease in light emission luminance can be prevented.
- Acrylic photocurable resist V259 PA manufactured by Nippon Steel Corporation, solid content: 50% by weight, solvent: propylene glycol methyl ether acetate
- coumarin 6 as an organic phosphor.
- 0.53 g, Basic Violet 111.5 g, and 1.5 g of oral damine 6G, and 25 g of a benzoguanamine resin as a pigment resin were uniformly mixed using a polymill, and then fluorescent.
- a composition for medium (ink for fluorescent medium) was obtained.
- the obtained composition for a fluorescent medium was spin-coated on a glass substrate OA2 (manufactured by Nippon Electric Glass Co., Ltd.) having a length of 112 mm, a width of 143 mm and a thickness of 1.1 mm, and was heated at a temperature of 80 ° C. for 10 minutes. Dry under conditions. Next, it is irradiated with ultraviolet rays (wavelength 365 nm) through a photomask that can obtain the pattern of the display area so that the exposure amount becomes 1500 mJ / cm 2, and photo-cured to form a fluorescent part (color conversion part). On the other hand, unexposed portions were removed using a developing solution (2% by weight KOH aqueous solution). Then, at 160 ° C for 30 minutes In this case, a post-baking treatment was performed to obtain a fluorescent medium having a thickness of 20 m.
- a 200 nm-thick IZO (indium zinc oxide) film was entirely formed on the glass substrate on which the fluorescent medium obtained in (1) was formed by a sputtering method.
- This IZO film is patterned under the same conditions as in Example 1 to form an anode (lower electrode). Then, after forming the first and second interlayer insulating films, the same conditions as in Example 1 are used.
- an organic EL device composed of a hole injection layer, a light emitting layer, an electron injection layer, and a cathode. Further, a sealing glass substrate (blue sheet glass, manufactured by Ziomatec Corporation) is formed.
- the organic EL display device having the configuration shown in FIG. 8 was manufactured by laminating on the cathode side and sealing the periphery thereof with a photocurable adhesive TB3102.
- an organic light-emitting medium (partly including an interlayer insulating film and a fluorescent medium; the same applies hereinafter) in the obtained organic EL display device was sampled, and a fully automatic water absorption / desorption measurement was performed.
- the weight was measured using an instrument IGA SORP.
- the weight A of the collected organic luminescent medium was 201.3977 mg, and the weight B was 201.336 Omg.
- the water content of the organic light emitting medium was 0.0306% by weight. Therefore, removing water from the fluorescent medium, the first and second interlayer insulating films, and the like in the dehydration step before forming the organic light emitting medium is an effective means for reducing the water content of the organic light emitting medium. Turned out to be.
- the water content in the fluorescent medium and the first and second interlayer insulating films was measured.
- the respective values were less than 0.05% by weight, and the water content in the IZO pattern was also measured. , Less than 0.001% by weight.
- Example 1 As in Example 1, a voltage of DC 10 V was applied between the lower electrode (IZO pattern, anode) of the obtained organic EL display device and the upper electrode (cathode) as the counter electrode.
- the aperture ratio which is the ratio of the pixel area when the total area of the light emitting surface was 100%, was 56%.
- Example 2 In the same manner as in Example 1, the obtained two sets of organic EL display devices were allowed to stand at room temperature (25 ° C) and in a constant temperature bath at 80 ° C for 2 weeks, respectively. The durability was evaluated from the change in the area of the light emitting area.
- the water content in the organic luminescent medium can be extended not only at atmospheric temperature and room temperature (25 ° C) but also at high temperature of 80 ° C. It has been found that the reduction of the light emitting area due to the generation of a non-light emitting region or a non-light emitting portion can be suppressed over time.
- An organic EL display device having the configuration shown in FIG. 9 was manufactured in the same manner as in Example 2, except that a flattening layer was formed between the fluorescent medium and the anode (lower electrode) in Example 2. .
- the acrylic flattening material V259 PA (manufactured by Nippon Steel Chemical Co., Ltd.) is spin-coated, dried at a temperature of 80 ° C for 15 minutes, and then coated with the fluorescent medium.
- contact exposure was performed using a high-pressure mercury lamp as a light source so that the exposure amount was 30 OmJZcm 2 .
- the unexposed area is developed using TMAH as a developing solution, and further post-baked using an oven at a temperature of 160 ° C to obtain a flattening layer having a thickness of about 5 zm.
- the organic light-emitting medium (partly including the fluorescent medium, the flattening layer, and the interlayer insulating film; the same applies hereinafter) in the obtained organic EL display device was collected and fully automated. Weight A and weight B were measured using a moisture adsorption / desorption measuring device IGA SORP.
- the water content of the organic light emitting medium was 0.0451% by weight. Therefore, removing water from the fluorescent medium, the planarizing layer, the first and second interlayer insulating films, and the like in the dehydration step before forming the organic light emitting medium reduces the water content of the organic light emitting medium. It turned out to be an effective means.
- the water content in the IZO pattern was measured and found to be less than 0.001% by weight.
- the aperture ratio which is the ratio of the pixel area when the total area of the light emitting surface was 100%, was 56%.
- Example 2 In the same manner as in Example 1, the obtained two sets of organic EL display devices were allowed to stand at room temperature (25 ° C) and in a constant temperature bath at 80 ° C for 2 weeks, respectively. The durability was evaluated from the change in the area of the light emitting area.
- the area of the light-emitting area after the release is 0.92, and in a constant temperature bath at 80 ° C,
- the area of the light emitting region after leaving was 0.90.
- the water content in the organic luminescent medium is set to a value equal to or less than the predetermined value (0.05% by weight), it can be used not only in the atmosphere, at room temperature (25 ° C), but also in a high temperature environment of 80 ° C. It was also found that the reduction of the light emitting area due to the generation of a non-light emitting region or a non-light emitting portion can be suppressed for a long time.
- Example 1 a red color filter was formed between a glass substrate and an anode (lower electrode), and a combination of DPVBi and rubrene was used as an organic light emitting medium material.
- An organic EL display having the configuration shown in FIG. 8 was produced in the same manner as in Example 1 except that dry helium was used in the dehydration step.
- a negative type photohardening material V259R (manufactured by Nippon Steel Chemical Co., Ltd.) made of an acrylic resin is spin-coated on a glass substrate, and dried at a temperature of 80 ° C for 15 minutes. , through a photomask having a pattern corresponding to the light emitting region, so that the exposure amount becomes 60 Om J / cm 2, was contact exposure as a light source a high pressure mercury lamp.
- Luprene deposition rate 0.0005 to 0.0015 nm / sec e.
- an organic light-emitting medium (including a part of a color filter and an interlayer insulating film; the same applies hereinafter) in the obtained organic EL display device was sampled, and a fully automatic moisture absorption / desorption measurement was performed. Measure weight A and weight B using IGA SORP did. As a result, the water content of the organic luminescent medium was 0.00312% by weight. Therefore, removing water from the empty filter, the first and second interlayer insulating films, etc. in the dehydration step before forming the organic luminescent medium is an effective means for reducing the water content of the organic luminescent medium. It turned out to be.
- the aperture ratio which is the ratio of the pixel area when the total area of the light emitting surface was 100%, was 56%.
- Example 2 In the same manner as in Example 1, the obtained two sets of organic EL display devices were allowed to stand at room temperature (25 ° C) and in a constant temperature bath at 80 ° C for 2 weeks, respectively. The durability was evaluated from the change in the area of the light emitting area.
- the water content in the organic luminescent medium by setting the water content in the organic luminescent medium to a value equal to or less than the predetermined value (0.05% by weight), it can be used not only in the atmosphere, at room temperature (25 ° C), but also in a high temperature environment of 80 ° C. It was also found that the reduction of the light emitting area due to the generation of a non-light emitting region or a non-light emitting portion can be suppressed for a long time.
- An organic EL display having the configuration shown in FIG. 8 in the same manner as in Example 3 except that a red color filter was further formed between the glass substrate and the fluorescent medium in Example 3. The device was made.
- the organic light emitting medium (partly including a color filter, a fluorescent medium, a flattening layer, an IZO, and an interlayer insulating film) in the obtained organic EL display device is the same as in Example 1.
- the samples were collected, and the weight A and the weight B were measured using a fully automatic moisture absorption / desorption measuring device IGA SORP.
- the water content of the organic luminescent medium was 0.0385% by weight. Therefore, removing water from the color filter, the fluorescent medium, the first and second interlayer insulating films, and the like in the dehydration step before forming the organic light emitting medium is effective in reducing the water content of the organic light emitting medium. It turned out to be an effective means.
- the water content in the YZ I pattern was measured and found to be less than 0.0001% by weight.
- Example 1 As in Example 1, a voltage of 10 V DC was applied between the lower electrode (IZO pattern, anode) of the obtained organic EL display device and the upper electrode (cathode) as the counter electrode to emit light.
- the aperture ratio which is the ratio of the pixel area when the total area of the light emitting surface was 100%, was 56%.
- Example 2 In the same manner as in Example 1, the obtained two sets of organic EL display devices were allowed to stand at room temperature (25) in the air and at a temperature of 80 ° C in a constant temperature bath for 2 weeks, respectively. The durability was evaluated from the change in the area of the area.
- the area of the light-emitting region after the release is 0.94, and in a constant temperature bath at 80 ° C,
- the area of the light emitting region after leaving was 0.91.
- the water content in the organic luminescent medium is set to a value equal to or lower than the predetermined value (0.05% by weight)
- the water content can be extended not only at atmospheric temperature and room temperature (25 ° C) but also at high temperature of 80 ° C. It has been found that the reduction of the light emitting area due to the generation of a non-light emitting region or a non-light emitting portion can be suppressed over time.
- Example 2 the anode (lower electrode) was made of IZO, a laminated film of Cr and ITO, and the fluorescent medium formed between the glass substrate and the cathode was formed between the sealing glass substrate and the cathode.
- An organic EL display device shown in FIG. 10 was produced in the same manner as in Example 2 except that the organic EL display device was formed between them.
- a Cr film with a thickness of 20 Onm is entirely formed on a glass substrate A2 glass (manufactured by Nippon Electric Glass Co., Ltd.) by a sputtering method, and a 130 nm-thick ITO film is further formed thereon.
- a sputtering method was formed by a sputtering method.
- the positive resist HPR204 was spin-coated on this ITO film, and dried at 80 ° C for 15 minutes.
- contact exposure was performed using a high-pressure mercury lamp as a light source through a photomask having a stripe pattern (line width 90 m, gap width 20 tm) so that the exposure amount was 10 OmJZcm 2 .
- the exposed area was developed using TMAH as a developer.
- the ITO film is etched using a hydrobromic acid aqueous solution (concentration: 47% by weight) as an etchant, and cerium nitrate ammonium is further etched.
- the Cr film was etched by using a perchloric acid aqueous solution HCE (Nagase, Sangyo Co., Ltd.).
- the positive resist is removed using stripper N303 to form a striped Cr / ⁇ pattern (960 lines) as the anode (lower electrode), and the first and second interlayer insulating films are formed. Formed.
- Example 2 a dehydration step was provided, and dehydration treatment was performed under the same conditions except that dry argon was used in Example 2. Then, as in Example 2, a hole injection layer, an organic luminescent medium, an electron injection layer, and a cathode were formed on the first and second interlayer insulating films. (Upper electrode) was formed to form an organic EL device.
- a 1 Q and Li were co-deposited at a deposition rate of 0.1 to 0.3 nm / sec and 0.005 nm / sec, respectively, and a 200 nm IZO film was formed.
- the composition for a fluorescent medium (ink for a fluorescent medium) used in Example 2 was sealed with a glass substrate for sealing having a length of 95 mm, a width of 128 mm and a thickness of 1.1 mm (blue sheet glass, manufactured by Geoma Tech Co., Ltd.). The top was spin-coated and dried at a temperature of 80 ° C. for 15 minutes.
- post-bake treatment was performed at 160 ° C. for 30 minutes to obtain a sealing glass substrate provided with a fluorescent medium having a thickness of 20 m.
- the sealing glass substrate provided with the obtained fluorescent medium was accommodated in a dry box, and subjected to dehydration treatment under the same conditions as in Example 2 except that a dry argon was used.
- a sealing glass substrate provided with a fluorescent medium is further laminated on the cathode (upper electrode) of the organic EL element, and the surroundings are sealed with a light-curing adhesive, An organic EL display having the configuration shown in FIG. 10 was obtained.
- an organic light emitting medium (partially including an interlayer insulating film; the same applies hereinafter) in the obtained organic EL display device was sampled, and a fully automatic moisture absorption / desorption measuring device IGA was used. Weight A and weight B were measured using SORP. As a result, the water content of the organic light emitting medium was 0.0210% by weight.
- removing water from the fluorescent medium, the first and second interlayer insulating films, and the like in the dehydration step before forming the organic light emitting medium is effective in reducing the water content of the organic light emitting medium. Proved to be a means.
- the aperture ratio which is the ratio of the pixel area when the total area of the light emitting surface was 100%, was 56%.
- Example 2 In the same manner as in Example 1, the obtained two sets of the organic EL display devices were allowed to stand in the atmosphere at room temperature (25) and in a constant temperature bath at 80 ° C for 2 weeks, respectively. The durability was evaluated from the change in the area of the area.
- Example 6 a red color filter similar to that of Example 4 was provided on the glass substrate for sealing instead of the fluorescent medium on the glass substrate for sealing, and the fabrication of the organic EL device was the same as in Example 4.
- An organic EL display device having the configuration shown in FIG. 10 was produced in the same manner as in Example 6, except that the configuration was the same.
- an organic light-emitting medium (partially including an interlayer insulating film; the same applies hereinafter) in the obtained organic EL display device was sampled, and a fully automatic moisture absorption / desorption measuring device was obtained. Weight A and weight B were measured using IGA SORP. As a result, the water content of the organic light emitting medium was 0.0153% by weight. Therefore, removing water from the color filter, the first and second interlayer insulating films, and the like in the dehydration step before forming the organic luminescent medium is an effective means for reducing the water content of the organic luminescent medium. It turned out that there was.
- Example 1 As in Example 1, a voltage of DC 10 V was applied between the lower electrode (Cr / ITO pattern, anode) of the obtained organic EL display device and the upper electrode (cathode) as the counter electrode.
- the aperture ratio which is the ratio of the pixel area when the total area of the light emitting surface was 100%, was 56%.
- Example 2 In the same manner as in Example 1, the obtained two sets of organic EL display devices were allowed to stand in the atmosphere at room temperature (25 ° C) and in a constant temperature bath at 80 conditions for 2 weeks, respectively. The durability was evaluated from the change in the area of the area.
- the water content in the organic luminescent medium can be extended not only in the atmosphere and at room temperature (25) but also in a high temperature environment of 80 ° C. It has been found that the reduction of the light emitting area due to the generation of a non-light emitting region or a non-light emitting portion can be suppressed over time.
- Example 1 Formation of anode and interlayer insulating film As in Example 1, an anode (lower electrode), a first interlayer insulating film, and a second interlayer insulating film (partition) were formed on a glass substrate OA2 glass.
- an organic light emitting medium of an organic EL element was formed from the following inks by an inkjet method as wet film formation. That is, the following inks are ejected from the head of the inkjet printing apparatus toward the opening of the first interlayer insulating film and applied, and then heated in nitrogen for 150 to 4 hours. In addition, water and solvents were scattered, and the PPV precursor was made to have a high molecular weight to obtain a red organic luminescent medium.
- Poly p-phenylenevinylene (PPV) precursor 0.3750% by weight Glycerin 5.0000% by weight Diethylene glycol 10.0000% by weight Water 1.2235% by weight
- the glass substrate on which the organic luminescent medium was formed was fixed to a substrate holder in a vacuum evaporation apparatus (manufactured by Nippon Vacuum Engineering Co., Ltd.). Then, Moribute emissions made heating boards of the vacuum evaporation apparatus, tris (8-quinolinol) aluminum (A1 Q) to yield capacity, vacuum 665X 10 Pa (5X 10_ 7 To rr), deposition rate 0.1 1
- An electron injection layer having a thickness of 20 nm was formed under the condition of 0.3 nm / sec.
- the glass substrate obtained in (3) was transferred to a dehydration unit for performing a dehydration step. That is, the glass substrate is placed in a dry box, heated to 60 using a hot plate, and while being introduced with dry nitrogen, the dew point is lowered to 150 ° C and left for about 2 hours. Then, moisture in the organic light emitting medium, the first and second interlayer insulating films, and moisture adhering to the glass substrate surface and the like were removed. 5Cathode formation
- the glass substrate obtained in (1) was fixed to a substrate holder in the vapor deposition apparatus. Then, an A1-Li alloy (Li concentration: 10 atm%) as a material for the counter electrode (cathode) was mounted on a tungsten filament. In this state, a striped cathode with a thickness of 15 Onm (line) under the conditions of a vacuum degree of 665 x 10 to 7 Pa (5 x 10 to 7 torr) and a deposition rate of 0.5 to 1. OnmZse c. 240 elements) to form an organic EL element.
- the obtained organic EL device is housed in a dry box into which dry nitrogen is introduced, and the light emitting surface is further covered with a blue sheet glass (manufactured by Geomatech Co., Ltd.).
- An adhesive TB3102 manufactured by Three Bond Co., Ltd. was treated and sealed.
- the organic luminescent medium in the obtained organic EL display device was sampled, and the weight A and the weight B were measured using a fully automatic moisture absorption / desorption measuring device IGA SORP.
- the water content of the organic luminescent medium was 0.0301% by weight.
- the aperture ratio which is the ratio of the pixel area when the total area of the light emitting surface was 100%, was 56%.
- Example 2 In the same manner as in Example 1, the obtained two sets of organic EL display devices were allowed to stand in the atmosphere at room temperature (25 ° C) and in a constant temperature bath at 80 conditions for 2 weeks, respectively. The durability was evaluated from the change in the area of the area.
- An organic EL display device was manufactured under the same conditions as in Example 5 in which a color filter, a fluorescent medium, and a flattening layer were provided, except that the heating temperature of the glass substrate in the dehydration step was changed from 60 to 120. ,evaluated. Table 2 shows the obtained results. As understood from the results, by setting the heating temperature of the glass substrate in the dehydration step to 100 ° C. or higher, the water content of the organic luminescent medium was reduced to 0.0098% by weight and 0.01% by weight or less. Turned out to be.
- the area of the light emitting region after leaving the device was 0. It became 0.95 when it was left in a thermostat at 80 ° C for 2 weeks. That is, even if a color filter, a fluorescent medium, and a flattening layer are provided, the water content of the organic luminescent medium is reduced to 0.01% by weight or less by setting the heating temperature of the glass substrate in the dewatering step to 10 or more. As a result, long-term operation is possible not only in the air, at room temperature (25 ° C), but also in a high-temperature environment of 80 ° C. It was found that the reduction of the light emitting area due to the occurrence of a non-light emitting region or a non-light emitting portion can be suppressed.
- An organic EL display device was manufactured under the same conditions as in Example 5 in which a color filter, a fluorescent medium, and a flattening layer were provided, except that the heating temperature of the glass substrate in the dehydration step was changed from 60 ° C to 160X3. And evaluated. Table 2 shows the obtained results. As can be understood from the results, by setting the heating temperature of the glass substrate in the dehydration step to 150 ° C. or higher, the water content of the organic luminescent medium is significantly reduced to 0.0006% by weight and 0.001% by weight or less. It turned out to be.
- the area of the light emitting region after leaving the device was 0.98 compared to that before leaving the device.
- the value was 0.97.
- An organic EL display device was manufactured under the same conditions as in Example 5 in which a color filter, a fluorescent medium, and a flattening layer were provided, except that the dew point was changed from 150 ° C to 110 in the dehydration step (dry box). And evaluated. Table 3 shows the obtained results.
- the water content of the organic luminescent medium can be reduced to 0.0495% by weight and 0.05% by weight or less. found.
- the obtained organic EL display was left in the air at room temperature (25 ° C).
- the area of the light-emitting region after standing was 0.90 compared to that before standing, and 0.87 when left in a constant temperature bath at 80 ° C for 2 weeks. It became.
- the dew point in the dehydration step to 110 ° C. or less, the water content of the organic luminescent medium becomes a value of 0.05% by weight or less. It is possible to suppress the reduction of the light-emitting area due to the generation of non-light-emitting regions or non-light-emitting parts over a long period of time in the high-temperature environment of 80 ° C as well as in the atmosphere at room temperature (25 ° C). There was found.
- Example 5 in which a color filter, a fluorescent medium and a flattening layer were provided, the same procedure was performed except that the dehydration step (dry box) was not heated on a hot plate while keeping the dew point at ⁇ 50 ° C.
- An organic EL display device was manufactured under the conditions and evaluated. Table 3 shows the obtained results.
- the water content of the organic luminescent medium is reduced to 0.0450 wt%, It has been found that it can be reduced to less than 0.05% by weight.
- the area of the light emitting region after leaving the device was less than that before leaving the device. 9 1, and 0.87 when left in a constant temperature bath at 80 for 2 weeks.
- the dew point is set to ⁇ 50 or less without heating the glass substrate in the dehydration step, so that the water content of the organic light emitting medium is reduced to 0. It can be set to a value of less than 5% by weight, and the generation of a non-light emitting area or a non-light emitting place for a long time in the atmosphere at room temperature (25 ° C) as well as in the high temperature environment of 80 It has been found that the reduction of the light emitting area due to the light emission can be suppressed.
- Example 4 in which a color filter was provided, in the dehydration step (dry box), the dew point was kept at 150 ° C and dry nitrogen was introduced while the hot plate was An organic EL display device was fabricated and evaluated under the same conditions except that the glass substrate was heated to 250 ° C. Table 3 shows the obtained results.
- the glass substrate was heated at 100 ° C. or higher with a hot plate while introducing dry nitrogen, whereby the water content of the organic luminescent medium was reduced to 0.0006% by weight. It has been found that the content can be reduced to 0.001% by weight or less.
- the glass substrate is heated on a hot plate at 100 ° C or more while introducing dry nitrogen to reduce the water content of the organic luminescent medium to 0.001 weight. % Or less, and the emission area is reduced due to the generation of non-emission areas or non-emission areas over a long period of time, even in the high-temperature environment of 80, as well as in the air, at room temperature (25 ° C). It has been found that can be significantly suppressed.
- Example 5 in which a color filter, a fluorescent medium, and a flattening layer were provided, in the dehydration step (dry box), the degree of vacuum was increased to 133 ⁇ 10 without introducing dry nitrogen, adjusting the dew point, and heating with a hot plate.
- - 5 except that the Pa (1X10- 5 to rr) is to produce an organic EL display device in the same conditions, was evaluated. Table 3 shows the obtained results.
- the area of the light emitting region after leaving the device was 0.
- the value was 91, and when left undisturbed in a constant temperature bath at 80 ° C for 2 weeks, the value was 0.88. That is, even if a color filter, a fluorescent medium, and a flattening layer are provided, the water content of the organic light emitting medium can be adjusted to 0.05% by weight or less by adjusting the degree of vacuum in the dehydration step.
- Example 5 in which a color filter, a fluorescent medium, and a planarizing layer were provided, in the dehydration step (dry box), the vacuum was increased to 133 ⁇ 10 5 Pa (without introducing dry nitrogen and adjusting the dew point). with a 1 X 10- 5 to rr), except that the glass substrate was heated to 160 ° C by hot plate is to produce an organic EL display device in the same conditions, was evaluated. Table 3 shows the obtained results.
- the water content of the organic luminescent medium can be reduced to 0.0006% by weight and 0.001% by weight or less. found.
- the water content of the organic luminescent medium is reduced to 0.001% by weight or less by adjusting the degree of vacuum and the heating temperature in the dehydration step. It is possible to significantly reduce the reduction of the light emitting area due to the generation of non-light emitting areas or non-light emitting places for a long time in the high temperature environment of 80 ° C as well as in the air, at room temperature (25 ° C). There was found.
- Example 5 in which a color filter, a fluorescent medium, and a flattening layer were provided, in the dehydration step (dry box), the degree of vacuum was reduced to 133 ⁇ 10 without introducing dry nitrogen, adjusting the dew point, and heating by a hot plate.
- a (l X 1 O ' ⁇ orr) and An organic EL display device was manufactured and evaluated under the same conditions except for the above. Table 3 shows the results.
- the water content of the organic luminescent medium can be reduced to 0.0488% by weight and a low value of 0.05% by weight or less. did.
- the obtained organic EL display device was left in the air at a temperature (25 "C) for 2 weeks, the area of the light emitting region after leaving the device was 0. The value was 91, and the value was 0.85 when the temperature was kept at 80 ° C for 2 weeks in a thermostatic chamber.
- the water content of the organic luminescent medium can be adjusted to 0.05% by weight or less by adjusting the degree of vacuum in the dehydration step.
- the reduction of the light emitting area due to the generation of non-light emitting areas or non-light emitting areas can be suppressed for a long period of time in the high temperature environment of 80 ° C as well as in the atmosphere and temperature (25 ° C).
- An organic EL display device was manufactured and evaluated under the same conditions as in Example 1 except that a dehydration step was provided before the formation of the organic EL element and dehydration treatment was not performed. Table 4 shows the obtained results.
- the water content of the organic luminescent medium was 0.0713% by weight because the dehydration step was not provided, and the water content could not be reduced to a value of 0.05% by weight or less.
- An organic EL display device was fabricated and evaluated under the same conditions as in Example 5 in which a color filter, a fluorescent medium, and a flattening layer were provided, except that dehydration was not performed before the formation of the organic EL device. Table 4 shows the obtained results.
- the water content of the organic luminescent medium was 0.3215% by weight because the dehydration step was not provided, and could not be reduced to a value of 0.05% by weight or less.
- the obtained organic EL display device was allowed to stand in the air at room temperature (25 ° C) for 2 weeks, the area of the light emitting region after leaving the device was 0. The value was 33 when the sample was left in a thermostat at 80 conditions for 2 weeks.
- the water content of the organic luminescent medium could not be reduced to a value of 0.05% by weight or less. It has been found that it is difficult to suppress the reduction of the light emitting area due to the occurrence of a non-light emitting region or a non-light emitting place under the condition of (25 ° C) and a high temperature environment of 80 ° C for two weeks.
- Example 5 in which a color filter, a fluorescent medium, and a flattening layer were provided, before the organic EL element was formed, dry nitrogen was introduced, and a slight dehydration treatment was performed at a dew point of 0, room temperature, and 2 hours. An organic EL display device was manufactured and evaluated under the same conditions except that the test was performed. Table 4 shows the obtained results.
- the moisture content of the organic luminescent medium was 0.1001% by weight, and could be reduced to a value of 0.05% by weight or less, since the dehydration treatment was slightly performed. Did not.
- the water content of the organic light emitting medium could not be set to a value of 0.05% by weight or less, and the water content of the medium at room temperature (25 ° C ) It was found that it was difficult to suppress the reduction of the emission area due to the occurrence of non-emission areas or non-emission areas when left for two weeks under conditions and a high temperature environment of 80 ° C.
- An organic EL display device was manufactured and evaluated under the same conditions as in Example 4 in which the filter was provided, except that a dehydration step was provided before the formation of the organic EL element and no dehydration treatment was performed. Table 4 shows the obtained results.
- the water content of the organic luminescent medium was 0.0821% by weight and could not be reduced to a value of 0.05% by weight or less because the dehydration step was not provided.
- the obtained organic EL display device When the obtained organic EL display device was allowed to stand in the air at room temperature (25 ° C) for 2 weeks, the area of the light emitting region after leaving the device was 0. The value was 75, and when left for 2 weeks in a constant temperature bath at 80 ° C, the value was 0.45.
- the water content of the organic luminescent medium could not be reduced to a value of 0.05% by weight or less. It was found that it was difficult to suppress the reduction of the light emitting area due to the occurrence of non-light emitting areas or non-light emitting areas under the condition of (25 ° C) and the high temperature environment of 8 for 2 weeks.
- An organic EL display device was manufactured and evaluated under the same conditions as in Example 8 in which the wet film formation was performed, except that a dehydration step was provided before forming the cathode of the organic EL element and dehydration treatment was not performed. Table 4 shows the obtained results.
- the water content of the organic luminescent medium was 0.1234% by weight and 0.05% by weight because the dehydration step was not provided before the cathode of the organic EL element was formed. It could not be reduced to the following values:
- the area of the light emitting region after leaving the device was less than that before leaving the device. It became 5.52, and when it was left in a thermostat at 80 ° C for 2 weeks, it became 0.42.
- the water content of the organic luminescent medium could not be set to a value of 0.05% by weight or less. It was found that it was difficult to suppress the reduction of the light emitting area due to the occurrence of a non-light emitting region or a non-light emitting place under the condition of (25 ° C.) and a high temperature environment of 80 ° C. for 2 weeks.
- An organic EL display device was manufactured and evaluated under the same conditions as in Example 6, except that a dehydration step was provided before the cathode of the organic EL element was formed and the dehydration treatment was not performed. Table 5 shows the obtained results.
- the water content of the organic luminescent medium is 0.1230% by weight and not more than 0.05% by weight because the dehydration step is not provided before the cathode of the organic EL element is formed.
- the dehydration step is not provided before the cathode of the organic EL element is formed.
- the water content of the organic luminescent medium could not be set to a value of 0.05% by weight or less. It was found that it was difficult to suppress the reduction of the light emitting area due to the occurrence of a non-light emitting region or a non-light emitting place under the condition of (25 ° C.) and a high temperature environment of 80 ° C. for 2 weeks.
- Example 1 after forming the cathode of the organic EL element, the conditions were 60 and 30 minutes. An organic EL display device was manufactured and evaluated under the same conditions except that the dehydration process was slightly performed. Table 5 shows the obtained results.
- the water content of the organic luminescent medium exceeded 0.1% by weight due to insufficient dehydration before forming the cathode of the organic EL device.
- the area of the light-emitting area after leaving the device is 0.53 compared to that before leaving the device.
- the value was 0.40.
- the dehydration step was not performed before forming the cathode of the organic EL element and the dehydration was not sufficiently performed, the water content of the organic luminescent medium could not be reduced to 0.05% by weight or less. It was found that it was difficult to suppress the reduction of the light emitting area due to the occurrence of non-light emitting areas or non-light emitting areas under the conditions of (25 ° C) and the high temperature environment of 80 for 2 weeks.
- Example 3 although a SiO 2 layer (200 m thick) as a moisture barrier layer was provided between the planarization layer and the lower electrode by sputtering, a dehydration step was provided before the organic EL element was formed. An organic EL display device was fabricated and evaluated under the same conditions except that no dehydration treatment was performed. Table 5 shows the obtained results.
- the water content of the organic luminescent medium exceeded 0.1% by weight because the dehydration step was not provided.
- the area of the light emitting area after leaving is 0.40 compared to before leaving, leaving it in a constant temperature bath at 80 for 2 weeks In that case, it was 0.20.
- the dehydration treatment was not performed before the formation of the organic EL element, the water content of the organic luminescent medium could not be reduced to a value of 0.05% by weight or less.
- the organic EL display device of the present invention even if the pixels are made high-definition, the organic luminescent medium is wet-formed, or left not only at room temperature but also in a high-temperature environment where oxidation is likely. As a result, it has become possible to provide an organic EL display device capable of preventing a reduction in a light emitting area due to generation of a non-light emitting region or a non-light emitting portion for a long time.
- the organic EL display device of the present invention can be used for consumer displays such as small-sized display portable terminal devices (mobile phones), in-vehicle display devices, instrument panel devices, car navigation devices, notebook personal computers, and wall-mounted televisions. It can be widely used in industrial display equipment such as equipment, office equipment display equipment, factory automation display equipment, and monitor for instrumentation equipment.
- consumer displays such as small-sized display portable terminal devices (mobile phones), in-vehicle display devices, instrument panel devices, car navigation devices, notebook personal computers, and wall-mounted televisions. It can be widely used in industrial display equipment such as equipment, office equipment display equipment, factory automation display equipment, and monitor for instrumentation equipment.
- an organic EL display device of the present invention can be efficiently obtained using a simple device.
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Description
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JP2001557343A JP4603754B2 (ja) | 2000-01-31 | 2001-01-26 | 有機エレクトロルミネッセンス表示装置およびその製造方法 |
EP01901548A EP1176850A4 (en) | 2000-01-31 | 2001-01-26 | ORGANIC ELECTROLUMINESCENCE DISPLAY DEVICE AND METHOD FOR PRODUCING THE DEVICE |
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EP (2) | EP1870948A3 (ja) |
JP (2) | JP4603754B2 (ja) |
KR (1) | KR100719641B1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
US20010050532A1 (en) | 2001-12-13 |
CN100474653C (zh) | 2009-04-01 |
KR20020001810A (ko) | 2002-01-09 |
CN1691856A (zh) | 2005-11-02 |
JP4603754B2 (ja) | 2010-12-22 |
US6633121B2 (en) | 2003-10-14 |
JP2010278028A (ja) | 2010-12-09 |
CN100433401C (zh) | 2008-11-12 |
CN1225150C (zh) | 2005-10-26 |
EP1870948A2 (en) | 2007-12-26 |
EP1176850A1 (en) | 2002-01-30 |
CN1358404A (zh) | 2002-07-10 |
TWI236859B (en) | 2005-07-21 |
CN1700822A (zh) | 2005-11-23 |
KR100719641B1 (ko) | 2007-05-17 |
EP1870948A3 (en) | 2008-07-02 |
EP1176850A4 (en) | 2007-01-24 |
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