JP2939523B2 - Organic EL device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic EL device. More specifically, the present invention relates to an organic EL device mainly used suitably for various displays and light emitting elements for information industry equipment and having excellent resistance to external mechanical vibration and impact.

[0002]

2. Description of the Related Art An organic EL device is composed of a laminate in which an organic light emitting material is sandwiched between a pair of opposed electrodes, and electrons are injected from one electrode and holes are injected from the other electrode. . Light emission occurs when the injected electrons and holes recombine in the light emitting layer. This organic EL element is expected to be used as a full-color flat panel display or as an alternative to an LED because of its high impact resistance and high visibility, and the variety of luminescent colors possessed by organic substances, and is being developed.

[0003]

The above-mentioned organic EL device is used by being attached to various devices in the form of an organic EL device having the device formed on a substrate. Mechanical vibrations and shocks. Since the organic EL element is a laminated body having a precise structure as described above, distortion, destruction, delamination, and the like of the laminated body occur due to external mechanical vibration or impact, and stable light emitting characteristics are maintained, and a long life is maintained. This has been a major obstacle in achieving the goal.

In a conventional organic EL device, as a sealing method for preventing deterioration mainly due to oxygen or moisture, for example, a method of forming a protective film (JP-A-4-137483, JP-A-4-73886). ) Is disclosed only, and no special consideration is given to means for protecting against external mechanical vibration or impact. The present invention has been made in view of the above problems, and effectively prevents deterioration of an organic EL element due to external mechanical vibration or impact.
It is an object of the present invention to provide an organic EL device capable of maintaining stable light emitting characteristics of an element and extending the life.

[0005]

According to the present invention, a pair of transparent or translucent electrodes, at least one of which is opposed to each other, is sandwiched between the pair of electrodes. In an organic EL device in which an organic EL element including a structure made of an organic light emitting material is formed, at least a support used for fixing the organic EL element is provided, and the support and the structure are provided. An organic EL device is provided, wherein a buffer substance is provided between the substrate and the substrate surface.

[0006] The buffer substance may be 0.001 to 10K.
An organic EL device is provided which is a substance capable of suppressing propagation of vibration of a high frequency component of Hz.

Further, the present invention provides an organic EL device, wherein the buffer substance is an elastic body.

[0008] Further, there is provided an organic EL device, wherein the elastic body as the buffer substance is made of rubber, a cushion material, or a spring.

Further, the present invention provides an organic EL device, wherein the support is an elastic steel plate.

Hereinafter, the organic EL device of the present invention will be specifically described. Note that the organic EL device according to the present invention is a device in which an organic EL element is formed on a substrate and which is necessary for actually attaching it to various devices, specifically, an organic EL device.
For fixing the L element, it preferably includes a support or the like used for fixing, vibration isolation and strain relaxation. 1. Each component of the organic EL device Each component used in the present invention will be described below. 1) Organic EL element Hereinafter, the configuration of the organic EL element used in the present invention will be described. The configuration of the element used in the present invention is not particularly limited, and any configuration can be adopted. For example, anode / light-emitting layer / cathode, anode / hole injection layer / light-emitting layer /
Cathode, anode / light-emitting layer / electron injection layer / cathode or anode / hole injection layer / light-emitting layer / electron injection layer / cathode can be mentioned. Each layer may be a laminate of a plurality of layers, or may be a mixed layer of a plurality of materials. Each layer of these organic substances is heated, for example, by heating a container containing an organic substance proposed in JP-A-5-17765 by a resistance heating method to evaporate the organic substance from the container, and dispose the evaporated organic substance on one side. It can be formed by a method of forming an organic layer by depositing on an electrode. The thickness of each layer is not particularly limited. The thickness of each layer excluding the Yin and Yang electrodes is usually 5n
m to 5 μm. The material is not particularly limited as long as it is usually used for an organic EL device. Hereinafter, each configuration of the organic EL device composed of the anode / hole injection / transport layer / emission layer / electron injection / transport layer / cathode will be specifically described.

Substrate The organic EL device used in the present invention is preferably formed on a substrate. The substrate used is preferably one having transparency, and specific examples include glass, transparent plastic, and quartz.

Electrodes The electrodes used in the present invention comprise a pair of electrodes (anode and cathode), at least one of which is transparent or translucent, facing each other. The reason why the material is transparent or translucent is to obtain a light-transmitting property. -1 Anode As the anode in the organic EL device used in the present invention, a metal, an alloy, an electrically conductive compound having a high work function (4 eV or more), and a mixture thereof as an electrode material can be suitably used. Specific examples of such an electrode material include metals such as Au, CuI, ITO, and SnO.
₂ , a transparent or translucent material having a dielectric property, such as ZnO. This anode can be formed by forming a thin film of these polar substances by a method such as vapor deposition or sputtering. When light is extracted from this electrode, it is desirable that the transmittance be greater than 10%, and that the sheet resistance of the electrode be several hundred Ω / □ or less. Further, the thickness depends on the material, but is usually 10 nm to 1 μm, preferably 10 nm to 1 μm.
It can be selected in the range of -200 nm.

On the other hand, the cathode has a small work function (4 eV or less).
Metals, alloys, electrically conductive compounds, and mixtures thereof can be used as an electrode material. Specific examples of such an electrode material include sodium, sodium-potassium alloy, magnesium, lithium, magnesium /
Examples thereof include a copper mixture, Al / (Al ₂ O ₃ ), indium, and rare earth metals. The cathode can be formed by forming a thin film from these electrode substances by a method such as evaporation or sputtering. Further, the sheet resistance as an electrode is preferably several hundred Ω / □ or less, and the film thickness can be selected usually in the range of 10 nm to 1 μm, preferably 50 to 200 nm. In addition,
In this EL element, it is preferable that either the anode or the cathode be transparent or translucent, since the electrodes themselves transmit light emission and improve the efficiency of extracting light emission.

Light-Emitting Layer The organic compound which can be used as a material for the light-emitting layer is not particularly limited, but includes a benzothiazole-based, benzimidazole-based, benzoxazole-based fluorescent whitening agent, a metal chelated oxinoid compound, and styrylbenzene. And the like.

Specific examples of the compound names include those disclosed in JP-A-59-194393. Typical examples thereof are 2,5-bis (5,7-di-t-pentyl-2-benzooxazolyl) -1,3,4-thiadiazole,
4'-bis (5,7-t-pentyl-2-benzooxazolyl) stilbene, 4,4'-bis [5,7-di-
(2-methyl-2-butyl) -2-benzoxazolyl] stilbene, 2,5-bis (5,7-di-t-pentyl-2-benzoxazolyl) thiophene, 2,5-
Bis [5-α, α-dimethylbenzyl-2-benzoxazolyl] thiophene, 2,5-bis [5,7-di-
(2-methyl-2-butyl) -2-benzoxazolyl] -3,4 diphenylthiophene, 2,5-bis (5-methyl-2-benzooxazolyl) thiophene,
4,4'-bis (2-benzoxazolyl) biphenyl, 5-methyl-2- [2- [4- (5-methyl-2-
Benzoxazoles such as benzoxazolyl) phenyl] vinyl] benzoxazole and 2- [2- (4-chlorophenyl) vinyl] naphtho [1,2-d] oxazole; 2-2 ′-(p-phenylenedivinylene) Benzothiazoles such as-)-bisbenzothiazole;
[4- (2-benzimidazolyl) phenyl] vinyl]
Examples thereof include benzimidazole-based fluorescent whitening agents such as benzimidazole and 2- [2- (4-carboxyphenyl) vinyl] benzimidazole. further,
Other useful compounds are described in Chemistry of Synthetic Soy 1971, pages 628-637 and 640.
Listed on page.

As the chelated oxinoid compound, for example, those disclosed in JP-A-63-295695 can be used. Typical examples thereof include tris (8-quinolinol) aluminum, bis (8-quinolinol) magnesium, bis (benzo [f] -8-quinolinol) zinc, bis (2-methyl-
8-quinolinolate) aluminum oxide, tris (8-quinolinol) indium, tris (5-methyl-8-quinolinol) aluminum, 8-quinolinol lithium, tris (5-chloro-8-quinolinol) gallium, bis (5- Chloro-8-quinolinol) calcium, poly [zinc (II) -bis (8-hydroxy-5-
Quinolinonyl) methane] and dilithium epthridione.

Further, as the styrylbenzene compound, for example, those disclosed in European Patent No. 0319881 or European Patent No. 03753582 can be used. Typical examples are 1,4-bis (2-methylstyryl) benzene and 1,4-bis (3
-Methylstyryl) benzene, 1,4-bis (4-methylstyryl) benzene, distyrylbenzene, 1,4-
Bis (2-ethylstyryl) benzene, 1,4-bis (3-ethylstyryl) benzene, 1,4-bis (2-
Methylstyryl) -2-methylbenzene, 1,4-bis (2-methylstyryl) -2-ethylbenzene and the like can be mentioned.

Further, a distyrylpyrazine derivative disclosed in JP-A-2-252793 can also be used as a material for the light emitting layer. Typical examples are 2,
5-bis (4-methylstyryl) pyrazine, 2,5-bis (4-ethylstyryl) pyrazine, 2,5-bis [2
-(1-naphthyl)) vinyl] pyrazine, 2,5-bis (4-methoxystyryl) pyrazine, 2,5-bis [2
-(4-biphenyl) vinyl] pyrazine, 2,5-bis [2- (1-pyrenyl) vinyl] pyrazine and the like. Others include, for example, EP 0
The polyphenyl compound disclosed in 377715 can also be used as a material for the light emitting layer.

Further, in addition to the above-described fluorescent whitening agent, metal chelating oxinoid compound, styrylbenzene compound and the like, for example, 12-phthaloperinone (J. Appl.
Phys., Vol. 27, L713 (1988)), 1, 4
-Diphenyl-1,3-butadiene, 1,1,4,4-
Tetraphenyl-1,3 butadiene (Appl. Phys.
Lett., Vol. 56, L799 (1990)), naphthalimide derivative (JP-A-2-305886), perylene derivative (JP-A-2-189890), oxadiazole derivative (JP-A-2-216791). Gazettes or oxadiazole derivatives disclosed by Hamada et al. At the 38th Joint Lecture on Applied Physics, aldazine derivatives (JP-A-2-220393), pyrazirine derivatives (JP-A-2-220394), Cyclopentadiene derivatives (JP-A-2-289675), pyrrolopyrrole derivatives (JP-A-2-29691),
Styrylamine derivatives (Appl. Phys. Lett., Vol. 56,
L799 (1990)), coumarin compounds (JP-A-2-191694), and WO90 / 1.
3148 and Appl. Phys. Lett., Vol 58, 18, P1982 (1991)
And the like can be used as a material for the light emitting layer.

In the present invention, an aromatic dimethylidin compound (European Patent No. 038876) is particularly used as a material for the light emitting layer.
No. 8 and JP-A-3-231970) are preferably used. As a specific example, 1, 4
-Phenylenedimethylidin, 4,4-phenylenedimethylidin, 2,5-xylylenedimethylidin, 2,6
-Naphthylenedimethylidin, 1,4-biphenylenedimethylidin, 1,4-p-terephenylenedimethylidin, 9,10-anthracenediyldylmethylidin, 4,4'-bis (2,2- Examples thereof include di-t-butylphenylvinyl) biphenyl and 4,4′-bis (2,2-diphenylvinyl) biphenyl, and derivatives thereof.

The thickness of the light emitting layer thus formed is not particularly limited and can be appropriately selected depending on the situation, but is preferably in the range of 5 nm to 5 μm.
The light emitting layer in the organic EL element has an injection function capable of injecting holes from an anode or a hole injection layer and injecting electrons from a cathode or an electron injection layer when an electric field is applied. Providing a transport function to move electrons and holes) by the force of an electric field, and a field for recombination of electrons and holes.
It has a light-emitting function and the like for connecting this to light emission. In addition,
There may be a difference between the ease of hole injection and the ease of electron injection. In addition, although the transport function represented by the mobility of holes and electrons may be large or small, it is preferable to move at least one of them.

Hole Injection Layer The material of the hole injection layer provided as needed is conventionally used as a hole injection material of a photoconductive material or a hole injection layer of an organic EL device. Any of the known ones can be selected and used. The material of the hole injecting layer has either hole injection or electron barrier properties, and may be either an organic substance or an inorganic substance.

Specific examples include triazole derivatives (see US Pat. No. 3,112,197) and oxadiazole derivatives (US Pat. No. 3,112,197).
189,447, etc.), imidazole derivatives (see Japanese Patent Publication No. 37-16096, etc.), polyarylalkane derivatives (U.S. Pat. Nos. 3,615,402 and 3,820,989) , No. 3,54
2,544, JP-B-45-555, and JP-B-5-555.
1-110983, JP-A-51-93224, JP-A-55-17105, JP-A-56-4148, JP-A-55-108667, and JP-A-55-15695.
Nos. 3 and 56-36656), pyrazoline derivatives and pyrazolone derivatives (U.S. Pat.
Nos. 80,729 and 4,278,746, JP-A-55-88064, and 55-8806.
No. 5, No. 49-105537, No. 55-51
Nos. 086 and 56-80051 and 56-8
No. 8141, No. 57-45545, No. 54-
Nos. 112637 and 55-74546, and phenylenediamine derivatives (US Pat. No. 3,61)
5,404, JP-B-51-10105,
Nos. 46-3712, 47-25336,
JP-A-54-53435 and JP-A-54-110536.
JP-A-54-119925, and arylamine derivatives (U.S. Pat. Nos. 3,567,450, 3,180,703, and 3,24).
Nos. 0,597, 3,658,520, 4,232,103, and 4,17.
Nos. 5,961 and 4,012,376, JP-B-49-35702, and 39-2775.
7, JP-A-55-144250 and JP-A-56-144250.
119132, 56-22437, West German Patent No. 1,110,518, etc., amino-substituted chalcone derivatives (see US Pat. No. 3,526,501, etc.), and oxazole derivatives (US Patent No. 3, 2
57,203), styryl anthracene derivatives (see JP-A-56-46234, etc.) and fluorenone derivatives (JP-A-54-110837).
And hydrazone derivatives (U.S. Pat.
17,462, JP-A-54-59143, JP-A-55-52063, JP-A-55-52064, JP-A-55-46760, and JP-A-55-85495.
JP, JP-A-57-1350, JP-A-57-1487
49, JP-A-2-311591 etc.),
Stilbene derivatives (JP-A-61-210363,
No. 61-228451, No. 61-14642, No. 61-72255, No. 62-47646, No. 62-36674, No. 62-10652.
JP-A-62-30255, JP-A-60-9344
No. 5, No. 60-94462, No. 60-174
Nos. 749 and 60-175052),
Silazane derivatives (U.S. Pat. No. 4,950,950), polysilanes (JP-A-2-204996), aniline-based copolymers (JP-A-2-282263), and JP-A-1-213399. And the like, and conductive polymer oligomers (especially thiophene oligomers) disclosed in US Pat.

As the material for the hole injection layer, those described above can be used.
No. 3,295,965, etc.), aromatic tertiary amine compounds and styrylamine compounds (U.S. Pat. No. 4,127,412, JP-A-53-270).
Nos. 33, 54-58445, 54-14
Nos. 9634, 54-64299, 55-
Nos. 79450, 55-144250, 5
No. 6-119132, No. 61-295558, No. 61-98353, No. 63-295695
It is particularly preferable to use an aromatic tertiary amine compound.

Representative examples of the porphyrin compound include porphine, 1,10,15,20-tetraphenyl-21H, 23H-porphine copper (II), 1,10,
15,20-tetraphenyl-21H, 23H-porphine zinc (II), 5,10,15,20-tetrakis (pentafluorophenyl) -21H, 23H-porphine, silicon phthalocyanine oxide, aluminum phthalocyanine chloride, phthalocyanine (metal-free ),
Examples thereof include dilithium phthalocyanine, copper tetramethyl phthalocyanine, copper phthalocyanine, chromium phthalocyanine, zinc phthalocyanine, lead phthalocyanine, titanium phthalocyanine oxide, Mg phthalocyanine, and copper octamethyl phthalocyanine.

Representative examples of the aromatic tertiary amine compound and styrylamine compound include N, N,
N ', N'-tetraphenyl-4,4'-diaminophenyl, N, N'-diphenyl-N, N'-bis- (3-
Methylphenyl)-[1,1′-biphenyl] -4,
4'-diamine, 2,2-bis (4-di-p-tolylaminophenyl) propane, 1,1-bis (4-di-p-
Tolylaminophenyl) cyclohexane, N, N,
N ', N'-tetra-p-tolyl-4,4'-diaminophenyl, 1,1-bis (4-di-p-tolylaminophenyl) -4-phenylcyclohexane, bis (4-dimethylamino-2 -Methylphenyl) phenylmethane,
Bis (4-di-p-tolylaminophenyl) phenylmethane, N, N'-diphenyl-N, N'-di (4-methoxyphenyl) -4,4'-diaminobiphenyl, N,
N, N ', N'-tetraphenyl-4,4'-diaminophenyl ether, 4,4'-bis (diphenylamino) quadriphenyl, N, N, N-tri (p-tolyl) amine, 4- (Di-p-tolylamino) -4′-
[4 (di-p-tolylamino) styryl] stilbene,
4-N, N-diphenylamino- (2-diphenylvinyl) benzene, 3-methoxy-4′-N, N-diphenylaminostilbenzene, N-phenylcarbazole and the like can be mentioned. Further, the above-described aromatic dimethylidin-based compound shown as a material for the light emitting layer can also be used as a material for the hole injection layer.

The thickness of the hole injection layer is not particularly limited, but is usually 5 nm to 5 μm. The hole injection layer may have a single-layer structure composed of one or more of the above-described materials, or may have a multilayer structure composed of a plurality of layers having the same composition or different compositions.

Electron Injection Layer The electron injection layer provided as needed may have a function of transmitting electrons injected from the cathode to the light emitting layer.
As the material, any one of conventionally known compounds can be selected and used.

Specific examples include nitro-substituted fluorenone derivatives, JP-A-57-149259, and JP-A-58-5.
Nos. 5450 and 63-104061, anthraquinodimethane derivatives, Polymer Prep
rints, Japan Vol. 37, No. 3 (1988) p. 681, etc., diphenylquinone derivatives, thiopyrandioxide derivatives, heterocyclic tetracarboxylic anhydrides such as naphthalene perylene, carbodiimide, Japanese Journal of Applied
Physics, 27, L269 (1988), JP-A-60-69657, JP-A-61-143664, and JP-A-61-14815.
9, Fluorenylidenemethane derivatives disclosed in JP-A-61-225151 and JP-A-61-23.
Anthraquinodimethane derivatives and anthrone derivatives disclosed in No. 3750 and the like, Appl. Phys. Lett.,
Oxadiazole derivatives disclosed by Hamada et al. At 55, 15, 1489 and the aforementioned 38th Lecture Meeting on Applied Physics,
A series of electron-transporting compounds disclosed in JP-A-59-194393 are exemplified. Incidentally, Japanese Unexamined Patent Publication No.
JP-A-194393 discloses the electron-transporting compound as a material for the light-emitting layer. However, according to the study of the present inventors, it has been found that the compound can be used as a material for the electron-injection layer.

Further, metal complexes of 8-quinolinol derivatives, specifically tris (8-quinolinol) aluminum, tris (5,7-dichloro-8-quinolinol) aluminum, tris (5,7-dibromo-8) -Quinolinol) aluminum, tris (2-methyl-8-quinolinol)
Aluminum or the center metal of these metal complexes is I
A metal complex or the like replacing n, Mg, Cu, Ca, Sn, Zn or Pb can also be used as a material for the electron injection layer. In addition, a metal-free or metal phthalocyanine or a metal phthalocyanine whose terminal is substituted with an alkyl group, a sulfone group, or the like is also desirable. Further, the distyrylpyrazine derivative exemplified as the material of the light emitting layer can also be used as the material of the electron injection layer.

The thickness of the electron injection layer is not particularly limited, but is usually 5 nm to 5 μm. The electron injection layer may have a single-layer structure composed of one or more of the above-described materials, or may have a multilayer structure composed of a plurality of layers having the same composition or different compositions.

2) Buffer substance The buffer substance used in the present invention is not particularly limited as long as it does not easily transmit vibration, but an elastic body such as rubber, a cushion material, and a spring is preferable. Among them, 0.
001 to 10 KHz, more preferably 0.1 to 10 KHz
The one that does not easily transmit the vibration of the high frequency component of Hz is preferable. Specific examples include rubbers such as styrene rubber,
Butadiene rubber, chloroprene rubber, butyl rubber, nitrile rubber, ethylene propylene rubber, Hypalon (Dupont: trade name), acrylic rubber, urethane rubber, silicone rubber, fluorine rubber, ethylene vinyl rubber, rubbery chlorinated polyethylene, nitrile isoprene rubber, A cushioning material such as epichlorohydrin rubber, alphin rubber, or natural rubber; a porous material such as urethane resin, styrene foam, or sponge; or a polymer such as nonwoven fabric, woven fabric, cotton, cardboard, corrugated paper, vinyl chloride, polyethylene, or vinylidene chloride Examples of the film or the spring include a spring, a leaf spring, and a pneumatic spring. Further, these may be stacked or used in combination.

Support In the present invention, a support is used for fixing the organic EL device, preferably for fixing, anti-vibration and strain relief. The support used in the present invention is not particularly limited as long as it has mechanical strength, heat resistance, and the like for fixing the organic EL element, preferably for fixing, anti-vibration, and strain relaxation. , Plastic board, wood board and the like. Among them, an elastic steel plate having a structure capable of absorbing shock and preventing vibration is preferable. Organic EL of the present invention
The mounting position of the support in the apparatus is not particularly limited, but it is preferable to mount the support in parallel with the substrate at a predetermined interval. Regarding the mounting method, it is preferable to mount between the support and the substrate with the buffer substance interposed therebetween.

2. Specific Configuration of Organic EL Device Hereinafter, a specific configuration of the organic EL device of the present invention will be described with reference to the drawings. FIG. 1A shows a case where rubbers are used as a buffer substance and a porous substance is used as a cushion material. In this example, a transparent electrode (anode) 2 is provided on a substrate 1.
An organic EL element 10 having a structure 7 in which an organic light emitting material 4 is sandwiched between an electrode (cathode) 3 and a support 6 and a molded rubber or porous material 5 as a buffer 5
Linked by one. That is, the rubbers or the porous substance 51 formed between both end portions on the surface of the substrate 1 on the side where the structure 7 is provided and the corresponding portion of the support 6 are arranged so as to be sandwiched therebetween. There is no particular limitation on the size of the molded rubber or the like, but it is preferable that the distance between the substrate 1 and the support 6 be 0.1 mm to 3 cm. Also, the support 6 and the like are prevented from touching the electrode 3 of the organic EL element 10 due to the contraction of rubber or the like. Buffer substance 5 (5
The fixing of 1) to the substrate 1 and the support 6 is not particularly limited, but can be performed by, for example, an adhesive or a screw.

FIG. 1B shows a case where a spring is used as a buffer substance. In this example, the organic EL element 10 and the support 6 on the substrate 1 similar to the above-described example are connected by a spring as the buffer substance 5. The place where this spring 52 is arranged is the same as in the above-described example. Although a wire wound type (spring) is used as the spring 52, a leaf spring type or an air spring type shown in FIG. 1C may be used. The fixing of the spring 52 to the substrate 1 and the support 6 is not particularly limited. In addition to the bolting shown in FIG.
An adhesive or the like may be used. Further, as shown in FIG. 1 (c), it may be fixed by sandwiching between leaf springs 53.

[0036]

EXAMPLES The present invention will be described more specifically with reference to the following examples. In this example, an organic EL element having a number display device was used.

Example 1 As shown in FIG. 2, between the back surface (light-emitting surface) of the glass substrate 1 of the organic EL element 10 (not shown) and the aluminum plate 61 as the support 6. Of silicone rubber (X-30-771A manufactured by Shin-Etsu Chemical Co., Ltd.) having a size of 8 × 35 × 3 mm, an aluminum plate 61 serving as a support 6 and a substrate 1 of the organic EL element 10 with an epoxy adhesive 8 And fixed.

Example 2 As shown in FIG. 3, a spring 52 was provided between the back surface of the substrate 1 of the organic EL element 10 (not shown) and the aluminum plate 61. This spring (natural length 5mm)
It was fixed to the aluminum plate 61 and the substrate 1 using a nut 22 and a washer 23.

Example 3 As shown in FIG. 4, a leaf spring 53 was provided between the back surface of the substrate 1 of the organic EL element 10 (not shown) and the aluminum plate 61.
The plate spring 53 and the substrate 1 are fixed by bolts 21, nuts 22,
A washer 23 was used. To fix the leaf spring 53 and the aluminum plate 61, first, a U-shaped insertion portion 64 was formed on the aluminum plate, and the end of the leaf spring 53 was inserted into the insertion portion 64 and fixed.

Embodiment 4 As shown in FIG. 5, an air spring 54 was arranged so as to surround the end of the substrate 1. 0.2 m thick as air spring 54
m air into a bag 24 made of PVC film,
At the time of plastic packaging in which the plastic case front surface 62 and the rear surface 63 are united,
The internal pressure was kept below 1 atm (especially when the temperature became low, it was kept below 1 atm). When the pressure is lower than 1 atm, a sufficient anti-vibration effect may not be obtained. The air spring 54 and the substrate 1 and the rear surface 63 of the plastic case were fixed with the epoxy adhesive 8. In addition,
As shown in FIG. 7, the same effect can be obtained by putting liquid or solid fine particles 25 into a bag 24 made of a polymer film. The liquid is not particularly limited, and examples thereof include water, organic compounds (paraffin, fluorinated hydrocarbons, such as Fluorinert, manufactured by Sumitomo 3M Limited), and inorganic substances (mercury, etc.). Examples of the solid fine powder include sand, silica, alumina, clay, starch, flour, and stone powder.

Example 5 As shown in FIG. 6, a sponge 55 was arranged around the light emitting display area on the front surface of the substrate 1 of the organic EL element 10 (not shown). The sponge 55, the substrate 1, and the rear surface 63 of the plastic case were fixed using an epoxy adhesive 8 (not shown). In this case, care was taken to prevent the elasticity of the sponge 55 from being lost due to a large amount of the adhesive impregnating the inside of the sponge 55 during bonding.

Example 6 Instead of the silicone rubber of Example 1, a 1 mm thick P
An organic EL device 20 was produced in the same manner as in Example 1, except that a VC film was used and an elastic steel plate 7 (trade name: Silentalloy, manufactured by Tokyo Shibaura Electric Co., Ltd.) was used as the support 6.

Embodiment 7 As shown in FIG. 8, NiTi having a band-like and wavy structure is used.
The organic EL device 20 was manufactured by sandwiching an elastic steel plate 7 (Nitinol, manufactured by Furukawa Mining Co., Ltd.) between the support 6 and the light emitting substrate 1 using bolts 21, nuts 22, and washers 23. .

Comparative Example 1 The procedure of Example 1 was repeated except that the silicone rubber in Example 1 was replaced with an aluminum plate having the same shape.

The organic E obtained in Example 1 and Comparative Example 1 was used.
With respect to the L apparatus, the vibration transmissibility and the destruction rate of the organic EL element due to each vibration application were measured as follows. That is, as a vibration transmissivity measuring device, an AC voltage generated from an FFT (Fast Fourier Transformation) analyzer (CF-900 manufactured by Ono Sokki Co., Ltd.) was input to the vibrator through the amplifier III as shown in FIG. On the shaker,
With the vibrator and the support 6 in contact with each other, the organic EL device 2
0 was placed. The sensor A was attached to the support 6 and connected to the FFT analyzer via the amplifier II.
The energy of the vibration at a certain frequency applied to the organic EL element 10 was detected by the sensor A. The sensor B was mounted on the substrate 1 and connected to the FFT analyzer via the amplifier I. The vibration applied to the substrate 1, that is, the organic EL element 10 was detected by the sensor B. The vibration transmissibility is represented by P ₁ (f), which is the energy of vibration at the frequency f generated in the substrate 1 and the organic EL element 10.
The energy of the vibration at the frequency f applied to the support 6 is represented by P ₂ (f), ₁₀ log ₁₀ (P ₁ (f) / P
₂ (f)). The unit is dB. FIG. 10 shows the relationship between the vibration transmissibility and the frequency in the case of Example 1 and Comparative Example 1. The peak around 7 Hz in the data of Example 1 is due to resonance. At 10 Hz or more, the vibration transmissibility becomes 0 dB or less, and an anti-vibration effect appears. Comparative Example 1 has almost no vibration damping effect, and thus has a vibration transmissibility of 0 dB over a wide frequency range. Also,
Using this device, vibration is applied for 1 hour by a shaker,
The destruction rate of the organic EL device was measured. The destruction was judged as destruction when the luminance became 10 cd / m ² or less when the same current as that when the luminance of the EL element was 100 cd / m ² was passed before the test. As a result, in the case of Example 1 using the buffer substance, the amount was 0.1% more than in the case of Comparative Example 1 not using the buffer substance.
It has been found that vibrations and shocks in a high frequency range of 1 to 10 KHz are reduced as shown in Table 1 below.

[Table 1] ──────────────────────── Number of tests Number of destroyed elements Survival rate% ％ {Example 1 55 16 29 Comparative Example 1 55 50 91}

[0047]

As described above, according to the present invention,
It is possible to provide an organic EL device capable of effectively preventing deterioration of the organic EL element due to external mechanical vibration or impact, maintaining stable light emitting characteristics of the element, and extending the life.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing a specific example of an organic EL device according to the present invention. FIG. 1 (a) is a cross-sectional view when rubber or a cushion material is used as a buffer substance, and FIG. FIG. 7C is a front view of the case where the plate spring is used, and FIG. 7C is a cross-sectional view of the case where a plate spring is used.

FIG. 2 schematically shows one embodiment of the present invention, wherein (a)
FIG. 4 is an explanatory view thereof, and FIG. 4B is a partial cross-sectional view taken along a line AB in FIG.

FIG. 3 schematically shows one embodiment of the present invention, wherein (a)
Is an explanatory view thereof, and (b) is a side view of a part thereof.

FIG. 4 schematically shows one embodiment of the present invention, wherein (a)
Is an explanatory view thereof, (b) is a side view of a part thereof, and (c) is an explanatory view schematically showing an insertion shape of an aluminum plate.

FIG. 5 schematically illustrates one embodiment of the present invention, wherein (a)
Is an explanatory view thereof, (b) is an explanatory view showing a case where a front surface of the case is removed, and (c) is a partial cross-sectional view taken along a line AB in (b).

FIG. 6 is a partially sectional explanatory view schematically showing one embodiment of the present invention.

FIG. 7 is a sectional view schematically showing one embodiment of the present invention.

8 (a) is a front sectional view schematically showing one embodiment of the present invention, and FIG. 8 (b) is a side sectional view thereof.

FIG. 9 is a schematic explanatory view showing a vibration transmissivity measuring device in an example of the present invention and a comparative example.

FIG. 10 is a graph showing a relationship between a vibration transmissibility and a frequency in Examples and Comparative Examples of the present invention.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 ... Substrate 2 ... Transparent electrode (anode) 3 ... Electrode (cathode) 4 ... Organic luminescent material 5 ... Buffer substance 51 ... Rubbers, cushioning material 52 ... Spring (spring) 53 ... Plate spring 54 ... Air spring 55 ... Sponge 6 ... Supporting body 61 ... Aluminum plate 62 ... Plastic case front 63 ... Plastic case back 64 ... Insertion part 7 ... Elastic steel plate 8 ... Adhesive 9 ... Hole 10 ... Organic EL element 20 ... Organic EL device 21 ... Bolt 22 ... Nut 23 ... Washer 24 ... Polymer film or PVC film 25 ... Gas, liquid or solid powder

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) H05B 33/02

Claims (5)

(57) [Claims] An organic EL element including a pair of electrodes, at least one of which is transparent or translucent, facing each other, and an organic light-emitting material sandwiched between the pair of electrodes is formed on a substrate. In the organic EL device, at least a support for fixing the organic EL element is provided, and a buffer substance is provided between the support and the surface of the substrate on which the structure is provided. Organic EL device. 2. The method according to claim 1, wherein the buffer substance is 0.001 to 10 KHz.
2. The organic EL device according to claim 1, wherein the organic EL device is a substance capable of suppressing propagation of vibration of a high frequency component. 3. The organic EL device according to claim 1, wherein the buffer substance is an elastic body. 4. The organic EL device according to claim 3, wherein the elastic body as the buffer substance is made of rubber, a cushion material, or a spring. 5. The organic EL according to claim 1, wherein the support is an elastic steel plate.
apparatus.