JP2003031357A - Electroluminescent element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electroluminescent element restrained from degradation for a long period of time and repeatedly sealable by compensating the shortage of gas barrier performance of a film base material on the light takeout side until the time immediately before use. SOLUTION: This electroluminescent element having a front face sealing layer, a light transmitting base material layer, a transparent positive electrode layer, a luminescent medium layer, a negative electrode layer and a back face sealing layer is covered and sealed with the front face sealing layer and the back face sealing layer. A protective layer having a gas barrier layer and an adhesive layer is laminated in a separable and re-sealable state on the front face sealing layer. The end parts of the back face sealing layer project from any end part of the front face sealing layer, and the projecting parts abut on the protective layer. In the electroluminescent element, the front face or back face sealing layer and/or the protective layer can be provided with a decorative design by printing or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electroluminescence element (hereinafter referred to as an EL element), which is expected to have a wide range of uses as a display such as an information display terminal and a surface emitting light source.

[0002]

2. Description of the Related Art EL elements are expected as next-generation flat panel displays which can be replaced with cathode ray tubes and liquid crystal displays due to advantages such as wide viewing angle, fast response speed, and low power consumption. In particular, by using a plastic film for the transparent electrode base material and the sealing material, it becomes possible to manufacture an EL element by a roll winding method, and thus it is possible to provide a thin, lightweight, flexible EL element at low cost. Is expected.

An EL element has a structure in which a light emitting medium layer is sandwiched between two electrodes, at least one of which is transparent, and light is generated in the light emitting medium layer by passing a current between both electrodes.

However, the EL element is deteriorated by the influence of moisture and oxygen in the atmosphere. As a specific example of EL element deterioration, there is a phenomenon in which a non-light emitting area called a dark spot occurs and expands over time. In particular, when a plastic film having a low gas barrier property is used as a base material, the deterioration of the EL element progresses more quickly.

As a means for solving this problem, Japanese Patent Laid-Open No.
As described in JP-A-89961 and JP-A-7-65957, a gas barrier film is used for E
There is a method of covering and sealing the L element.

The gas barrier film arranged on the back side (the side opposite to the light extraction surface) does not need to be translucent, and should be sealed with a film laminated with a metal foil such as an aluminum foil having a particularly high gas barrier property. Is effective.

On the other hand, the front side (light extraction surface side)
Since the film substrate of (1) needs to be translucent, a film obtained by laminating a translucent gas barrier film such as a fluororesin film or an inorganic thin film vapor deposition film has been used. However, the present situation is that a translucent film having a sufficient gas barrier property including the above film has not yet been developed.

Therefore, when the current film EL device is put to practical use, it is preferable to use it for applications requiring thinness, light weight, small size and low price. For example, various printed matters such as telegrams, greeting cards, postcards, etc. that transmit information such as characters and pictures to the other party can achieve the purpose if deterioration of the EL element can be suppressed at least until reaching the other party's hand.

For such applications, it is not necessary to visually recognize the light emission until the time of use, and a means for suppressing deterioration by enclosing it in a sealing bag having a layer having a high gas barrier property such as a metal foil is effective. Is. However, in the case of sealing with a sealing bag, EL
Since the external appearance of the element is increased by the size of the sealing end of the sealing bag,
There is a problem that it is not preferable. Further, although the sealing ability on the back side of the EL element is sufficient, the sealing bag is provided with the sealing material on both sides of the EL element, so that the sealing material is excessively used. There is. Also, once the EL element is opened, the EL element deteriorates, and even if it is re-enclosed, air containing water is enclosed together.
There is a problem that the deterioration of the L element cannot be suppressed.

[0010]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems. The problem is that the gas barrier performance of the film base material on the light extraction surface side is insufficient immediately before use. The present invention is to provide an electroluminescent element which can block moisture from the outside and can be repeatedly sealed.

[0011]

In order to solve the above problems, first, in claim 1, in an electroluminescent element having at least a transparent anode layer, a light emitting medium layer and a cathode layer, at least on the transparent anode layer side. The electroluminescent element is characterized in that a protective layer having a gas barrier layer and an adhesive layer is laminated in a peelable state. In claim 2, at least the protective layer, the front sealing layer, the translucent base material layer, the transparent anode layer, the luminescent medium layer, the cathode layer, and the back sealing layer having at least the gas barrier layer and the sealant layer in this order. The electroluminescent element is characterized in that it is laminated and the end portion of the backside sealing layer is in contact with the protective layer. A third aspect of the present invention is the electroluminescent element according to the first or second aspect, wherein the protective layer is provided in a resealable state. In claim 4, at least one surface of the front sealing layer, the back sealing layer or the protective layer is
The electroluminescent element according to any one of claims 1 to 3, wherein a printed layer of at least one layer is laminated.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An example of an EL device of the present invention and a manufacturing method thereof will be described below with reference to FIG.

In order for the electroluminescence element to emit light, at least the transparent anode layer 2, the light emitting medium layer 3 and the cathode layer 4 are sufficient as shown in the figure. As a concrete form, the transparent anode layer 2 is used. It is formed on the translucent base material layer 1, and a front sealing layer 6, a translucent base material layer 1, a transparent anode layer 2, a light emitting medium layer 3, a cathode layer 4, and a back sealing layer 5 are laminated in this order. Is desirable.

In the present embodiment, as the translucent base material layer 1, any base material can be used as long as it is a substrate having translucency and insulation. For example, polypropylene, polyether sulfone, polycarbonate, cycloolefin polymer, polyarylate, polyamide,
A plastic film or sheet such as polymethyl methacrylate may be used, or a film obtained by forming a gas barrier film such as silicon oxide or aluminum oxide on the plastic film or sheet, or a film formed by forming the gas barrier film. A laminated product can be used.

First, the transparent anode layer 2 is formed on the transparent base material layer 1 by a known film forming method such as a sputtering method or a vacuum deposition method. Then, the transparent anode layer 2 is patterned by a known patterning technique such as a wet etching method or a dry etching method to form the transparent anode layer 2 which also serves as the extraction electrode 2a and the cathode extraction electrode 2b.

As the material of the transparent anode layer 2, a metal oxide material such as indium tin oxide, indium zinc oxide, zinc aluminum oxide, cadmium tin oxide, or a metal thin film material such as gold or platinum is used. be able to.

Further, in order to improve the adhesion between the transparent base material layer 1 and the transparent anode layer 2, the surface of the transparent base material 1 is previously subjected to surface treatment such as corona discharge treatment, plasma treatment, UV ozone treatment. In addition, an inorganic insulating thin film such as silicon oxide, silicon nitride, or silicon oxynitride, a metal thin film such as chromium or titanium, or the like may be inserted as a single layer or a laminate.

Next, the light emitting medium layer 3 is formed. here,
Before forming the light emitting medium layer 3, it is preferable to perform surface treatment such as corona discharge treatment, plasma treatment, and UV ozone treatment for the purpose of cleaning the surface and modifying the surface of the transparent anode layer 2.

The light emitting medium layer 3 in the present invention can be formed of a single layer film containing a fluorescent substance or a multilayer film. When the light emitting medium layer is formed of a multilayer film, examples of the structure of the light emitting medium layer include a hole injecting and transporting layer, an electron transporting light emitting layer or a hole transporting light emitting layer, a two-layered structure including an electron transporting layer and a hole injecting and transporting layer
There is a three-layer structure including a light emitting layer and an electron transporting layer. It is also possible to form more layers, and each layer is sequentially formed on the substrate.

Materials for the hole injecting and transporting layer include metal phthalocyanines such as copper phthalocyanine and tetra (t-butyl) copper phthalocyanine and non-metal phthalocyanines, quinacridone compounds, 1,1-bis (4-di-p- Tolylaminophenyl) cyclohexane, N, N′-diphenyl-N, N′-bis (3-methylphenyl) -1,1 ′
-Biphenyl-4,4'-diamine, N, N'-di (1
-Naphtyl) -N, N'-diphenyl-1,1'-biphenyl-4,4'-diamine and other low molecular weight materials such as aromatic amines, polythiophene, polyaniline and other high molecular weight materials, polythiophene oligomer materials, etc. It can be selected from existing hole transport materials.

Materials for the light emitting layer include 9,10-diarylanthracene derivatives, pyrene, coronene, perylene,
Rubrene, 1,1,4,4-tetraphenylbutadiene, tris (8-quinolinolato) aluminum complex,
Tris (4-methyl-8-quinolinolato) aluminum complex, bis (8-quinolinolato) zinc complex, tris (4-methyl-5-trifluoromethyl-8-quinolinolato) aluminum complex, tris (4-methyl-5--5)
Cyano-8-quinolinolato) aluminum complex, bis (2-methyl-5-trifluoromethyl-8-quinolinolato) [4- (4-cyanophenyl) phenolate]
Aluminum complex, bis (2-methyl-5-cyano-8)
-Quinolinolato) [4- (4-cyanophenyl) phenolate] aluminum complex, tris (8-quinolinolato) scandium complex, bis [8- (para-tosyl)
Aminoquinoline] zinc complex and cadmium complex, 1,
2,3,4-Tetraphenylcyclopentadiene, pentaphenylcyclopentadiene, poly-2,5-diheptyloxy-para-phenylene vinylene, coumarin-based phosphor, perylene-based phosphor, pyran-based phosphor, anthron-based phosphor , Porphyrin-based phosphor, quinacridone-based phosphor, N, N'-dialkyl-substituted quinacridone-based phosphor,
It is possible to use low molecular weight materials such as naphthalimide-based phosphors and N, N′-diaryl-substituted pyrrolopyrrole-based phosphors, polymer materials such as polyfluorene, polyparaphenylene vinylene, and polythiophene, and other existing light emitting materials. .

The material for the electron injecting and transporting layer is 2- (4
-Bifinylyl) -5- (4-t-butylphenyl)
-1,3,4-oxadiazole, 2,5-bis (1-
Examples thereof include naphthyl) -1,3,4-oxadiazole, oxadiazole derivatives, bis (10-hydroxybenzo [h] quinolinolate) beryllium complex, and triazole compounds.

As a method for forming the light emitting medium layer 3, a vacuum deposition method, a coating method such as spin coating, spray coating, flexo, gravure, roll coating, intaglio offset, or a printing method can be used depending on the material. The thickness of the light emitting medium layer 3 is 1000 nm or less, preferably 50 to 50, even when formed as a single layer or a laminated layer.
It is 150 nm.

Next, the cathode layer 4 is formed. As the material of the cathode layer 4, it is preferable to use a substance having a high electron injection efficiency. Specifically, a simple metal such as Mg, Al, or Yb is used, or Li, Li oxide, LiF is added to the interface in contact with the light emitting medium.
It is possible to stack Al, Cu, and Ag having high stability and conductivity with a compound such as 1 nm sandwiched therebetween.

Alternatively, in order to achieve both electron injection efficiency and stability, Li, Mg, Ca, Sr, La, having a low work function,
An alloy system of one or more metals such as Ce, Er, Eu, Sc, Y and Yb and a stable metal element such as Ag, Al and Cu may be used. Specifically, MgAg, AlLi, CuL
Alloys such as i can be used.

As the method for forming the cathode layer 4, a resistance heating vapor deposition method, an electron beam vapor deposition method, a reactive vapor deposition method, an ion plating method, a sputtering method, a laminating method or the like can be used depending on the material. The thickness of the cathode is 1
About 0 nm to 1000 nm is desirable.

Next, the back side sealing layer 5 and the front side sealing layer 6 are laminated. The sealing layers 5 and 6 preferably have at least a gas barrier layer and have a sealant layer on at least one of them. Here, before laminating the sealing layers 5 and 6, an inorganic thin film having excellent gas barrier properties such as silicon oxide, aluminum oxide, and silicon nitride is formed on the cathode layer 4 as a single film or an organic film such as a curable resin. It is more preferable to protect the EL element by forming a laminated film of.

As the gas barrier layer, metal oxides such as silicon oxide, aluminum oxide, chromium oxide and magnesium oxide, metal fluorides such as aluminum fluoride and magnesium fluoride, silicon nitride and aluminum nitride are used as the gas barrier layer. A film in which a metal nitride such as chromium nitride or another translucent inorganic thin film is formed into a single layer or a laminated film, a film in which aluminum, copper, nickel, stainless steel, an aluminum alloy, or the like is deposited, or a metal foil of these can be used. .
In the present invention, the performance of the gas barrier layer is 10 ^-2 g / m2.
/ Day or less, preferably 10 ^-5 g /
It is more preferable that it is m2 / day or less. Since the backside sealing layer 5 is arranged on the side opposite to the EL emission extraction surface, it does not need to be translucent, and it is preferable to use a metal foil having a high gas barrier property. Further, since the front surface sealing layer 6 is on the light extraction surface side, it is preferable to use a translucent inorganic thin film such as a metal oxide or a metal nitride.

As the sealant layer, an acid modified product of polyolefin such as polyethylene, polypropylene, ethylene / propylene copolymer, an acid modified product of ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / methacrylic acid. A thermoplastic adhesive resin such as a copolymer or an ionomer can be used.

Next, the EL elements are sealed by thermocompression bonding the sealing layers 5 and 6. Here, the thermocompression bonding is more preferably performed in a vacuum or in an atmosphere of an inert dry gas such as nitrogen or argon. As a sealing method, it is preferable to stack the sealing layers 5 and 6 so as to cover the EL element and thermocompression-bond them.

Next, in order to make up for the insufficient gas barrier performance of the translucent base material layer 1 and the front surface sealing layer 6, a protective layer 7 is formed on the front surface sealing layer 6 and the end projections of the back surface sealing layer 5. Stack. The protective layer 7 preferably has at least a gas barrier layer and an adhesive layer, and is laminated in a peelable state. Furthermore, it is more preferable that it can be reattached after peeling. If laminated in a peelable state, the protective layer 7 does not need to be translucent, and may be a vapor deposition film of a metal material such as aluminum, copper, nickel, stainless steel, or an aluminum alloy, or a metal foil of these metal materials. Well, silicon oxide,
It may be an inorganic thin film vapor-deposited film of aluminum oxide, aluminum fluoride, silicon nitride, silicon oxynitride, etc., may be a colored or printed plastic film or paper, and may be laminated by combining the above plastic film, metal foil, paper, etc. Alternatively, another electroluminescence element may be used. Particularly, it is preferable that at least a metal foil having excellent moisture resistance is laminated. Further, the protective layer 7 may not be peelable on the entire surface, and for example, one side of the adhesive portion with the backside sealing layer 5 may not be peeled and may be peeled in a spread manner.

The main materials of the adhesive layer are natural rubber, esterified natural rubber, styrene-butadiene rubber, butyl rubber, polyisobutylene polymer, rubber adhesive such as styrene-isoprene-styrene, and acrylic acid ester-based acrylic acid. , Methacrylic acid, acrylamide,
Acrylic adhesive mainly composed of copolymers of monomers such as vinyl acetate and styrene, silicone adhesive composed of silicone resin obtained by condensation reaction of hydrolyzate of silicone rubber and organochlorosilane, and these Mixtures can be used.

These adhesives include tackifiers such as rosin-based resins, terpene-based resins, aliphatic petroleum resins, aromatic petroleum resins, and the like, if necessary, such as adjustment of adhesive strength and improvement of weather resistance. , Phthalates, phosphates, plasticizers such as animal and vegetable oils and mineral oils, fillers such as calcium carbonate and silicates, amine-based, phenol-based, imdal-based antioxidants, and other existing additives Is preferably mixed in an appropriate amount.

When the protective layer 7 is peeled off, it is preferable that the adhesive layer is peeled off together with the protective layer 7 without remaining on the front side sealing layer 6 and the back side sealing layer 5 side. The adhesive force between the adhesive layer and the protective layer 7 may be improved by applying an undercoating agent to the undercoat or surface treatment such as corona treatment. A release agent may be applied to the sealing layer 5 to facilitate the release of the adhesive layer.

As the undercoating agent, it is preferable to use a mixture or copolymer of a polymer material having an affinity with the adhesive layer and a polymer material having an affinity with the protective layer 7. In particular, organic titanium-based, isocyanate-based, polyethyleneimine-based, polybutadiene-based and the like can be used as the main component. For example, in the case of a combination of aluminum foil and acrylic rubber, a mixture of isocyanate, active hydrogen-containing material, chlorinated rubber, etc. can be used.

Examples of the release agent include long-chain alkyl group-containing polymers such as polyester acrylate and polyester allyl acrylamide, silicone-based polymers such as copolymers of phenylmethyl siloxane and dimethyl siloxane, and poly (1,1-cyhydroperfluorohexyl methacrylate). ), Poly (N-ethyl, N-perfluorooctanesulfoamidoethylmethacrylate), and other perfluoro-based polymers can be used.

In order to contribute to the design, the front sealing layer 6,
The back sealing layer 5 or the protective layer 7 is more preferably laminated with a printing layer in addition to the gas barrier layer and the sealant layer. As a printing layer, flexo, gravure, roll coat, on a translucent substrate such as a plastic film,
Printing or coloring may be performed by a known printing method such as intaglio offset or ink jet method, and other functions such as polarization, lens, antireflection and color filter may be added.

[0038]

EXAMPLE An EL element according to the present invention will be described below.
FIG. 1 is a schematic view illustrating an example of a manufacturing process of an EL device of the present invention and a light emitting laminate using the EL device. In addition, FIGS. 2A to 2D are schematic views illustrating the EL elements described in Comparative Examples 1 to 4, respectively.

Example 1 First, a polyethylene terephthalate film (50 μm) was used as the translucent base material layer 1.
A silicon oxide thin film having a thickness of 50 nm was formed as an adhesive layer on one surface, and then indium tin oxide (ITO) having a thickness of 150 nm was formed as a transparent anode layer 2 by a sputtering method. Further, the ITO film 2 was patterned by the photolithography method and the wet etching method to form the ITO film 2 also serving as the extraction electrode 2a and the cathode extraction electrode 2b (FIG. 1A).

Next, after the surface of the ITO film was subjected to UV ozone treatment, poly [2-methoxy-5-) was used as the light emitting medium layer 3.
(2'-Ethyl-hexyloxy) -1,4-phenylene vinylene] (MEHPPV) was formed to 100 nm by the direct gravure method.

Next, as the cathode layer 4, Ca (20 nm) and Ag (200 nm) were laminated in this order by a vacuum evaporation method (FIG. 1 (b)).

Next, as the back surface sealing layer 5, polyethylene terephthalate (12 μm) and aluminum foil (20 μm) were used.
m) and an acid-modified polyethylene (30 μm) were dry laminated and extrusion laminated in this order.

Next, as a front surface sealing layer 6, a silicon oxide thin film (50 n) was formed on polyethylene terephthalate (12 μm).
m) is vacuum-deposited, and then an acid-modified polyethylene (3
0 μm) was dry laminated.

Next, in the dry nitrogen atmosphere, the front surface sealing layer 6
The back sealing layer 5 and the back sealing layer 5 were thermocompression-bonded at the ends to cover and seal the EL element.

Finally, an aluminum foil tape (Scotch, a trademark of 3M Co.) was used as the protective layer 7 in a dry nitrogen atmosphere.
It adhered to the end projections of the front sealing layer 6 and the back sealing layer 5 (Fig. 1 (c)).

The obtained EL device was stored in a constant temperature bath at 40 ° C. and 90% RH for 1000 hours, and then the protective layer 7 was peeled off to allow the EL device to emit light. The light emitting area was 80% of the initial area. there were. In addition, the obtained EL device was
After storage in a constant temperature bath of 90% RH for 500 hours, the protective layer 7 was peeled off and the EL element was allowed to emit light. The light emitting area was 90% of the initial area, and the protective layer 7 was adhered again. When the EL element was allowed to emit light after being stored for 500 hours in a thermostat at 90 ° C. and RH for 500 hours, the light emitting area was 60% of the initial area.

Example 2 A printed layer was previously laminated on the front sealing layer 6 and the protective layer 7 used in Example 1 to prepare a light emitting laminate. As the printing layer, printing was carried out on a polyethylene terephthalate (12 μm) substrate and laminated on the front sealing layer and the protective layer 7 to provide the printing portion 8 (FIG. 1).
(D)).

The EL device thus obtained was stored in a constant temperature bath at 40 ° C. and 90% RH for 1000 hours, and then the protective layer 6 was peeled off to allow the EL device to emit light. The light emitting area was 80% of the initial area. It was In addition, the obtained EL device was
After storage in a constant temperature bath of 90% RH for 500 hours, the protective layer 7 was peeled off and the EL element was allowed to emit light. The light emitting area was 90% of the initial area, and the protective layer 7 was adhered again. When the EL element was allowed to emit light after being stored for 500 hours in a thermostat at 90 ° C. and RH for 500 hours, the light emitting area was 60% of the initial area.

(Comparative Example 1) The protective layer 6 was not laminated on the EL element prepared in Example 1 (FIG. 2 (a)), and 40 ° C. 90%.
When the EL element was allowed to emit light after being stored in a thermostatic bath of RH for 1000 hours, it did not emit light.

(Comparative Example 2) The EL device produced in Comparative Example 1 was enclosed in a sealing bag 8 composed of an aluminum foil and an adhesive layer (Fig. 2 (b)). The obtained EL element was placed at 40 ° C.
After storing in a thermostat of 90% RH for 1000 hours and then taking out from the sealing bag 8 and letting the EL element emit light, the light emitting area was 80% of the initial area. Also, the EL obtained
The device was stored in a constant temperature bath at 40 ° C. and 90% RH for 500 hours, then taken out from the sealing bag and the EL device was made to emit light. The light emitting area was 90% of the initial area, and the sealing bag 8 EL element is enclosed inside, 40 ℃ 90% RH
After storing for 500 hours in the constant temperature bath, the EL device was taken out from the sealing bag 8 and the EL device was made to emit light, but no light was emitted.

(Comparative Example 3) In the EL element of Example 1, the back sealing layer 5 and the front sealing layer 6 were thermocompression-bonded to the end portions of the translucent base material layer 1 and the protective layer 7 was formed. It adhered only to the front sealing layer 6 (Fig. 2 (c)). The obtained EL element,
Store in a constant temperature bath at 40 ° C and 90% RH for 1000 hours, then EL
When the device was made to emit light, the light emitting area was 60% of the initial area.
Met. In addition, the obtained EL device was tested at 40 ° C. and 90% R
After the protective layer 7 was peeled off and the EL element was made to emit light after being stored in a thermostatic bath of H for 500 hours, the light emitting area was 80% of the initial area.
When the EL element was allowed to emit light after being stored for 500 hours in a thermostat at 90 ° C. and RH for 500 hours, the light emitting area was 20% of the initial area.

(Comparative Example 4) In the EL device of Example 1, the back sealing layer 5 does not project beyond the front sealing layer 6 when the back sealing layer 5 and the front sealing layer 6 are thermocompression bonded. And then
The protective layer 7 was adhered only to the front sealing layer 6 (see FIG. 2).
(D)). The obtained EL device was stored in a constant temperature bath at 40 ° C. and 90% RH for 1000 hours, and the EL device was caused to emit light. The light emitting area was 65% of the initial area. The EL device thus obtained was stored in a constant temperature bath at 40 ° C. and 90% RH for 500 hours, and then the protective layer 7 was peeled off to allow the EL device to emit light. The light emitting area was 85% of the initial area. Then, the protective layer 7 was adhered again and stored in a constant temperature bath at 40 ° C. and 90% RH for 500 hours, and the protective layer 7 was peeled off to allow the EL element to emit light. It was

[0053]

According to the invention of claim 1, by laminating a protective layer having at least a gas barrier layer and an adhesive layer on the front sealing layer, it is possible to compensate for the insufficient gas barrier performance on the light extraction surface side. It is possible to block moisture from the outside and suppress deterioration of the EL element until just before use. According to the second aspect of the invention, since at least the back sealing layer having the gas barrier layer and the sealant layer and the protective layer are in contact with each other, it is possible to suppress the intrusion of water from the end portion of the film, so that it is possible for a long time. Degradation of the EL element can be suppressed, which is preferable as an embodiment of the invention described in claim 1. According to the invention described in claim 3, the deterioration of the EL element can be suppressed by re-adhering the protective layer after using the EL element. According to the invention of claim 4, by laminating the printing layer on the front sealing layer or the back sealing layer and / or the protective layer, deterioration of the EL element can be suppressed for a long time until it is actually used. Further, it is possible to manufacture a light emitting laminate which is excellent in designability, in which deterioration of the EL element can be suppressed by re-adhering even after peeling.

[0054]

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a manufacturing process of an EL element of the present invention.

FIG. 2 is an explanatory diagram showing EL devices of Comparative Examples 1 to 4 of the present invention.

[Explanation of symbols]

1 Translucent base material layer 2 Transparent anode layer 3 Luminous medium layer 4 cathode layer 5 Back sealing layer 6 Front sealing layer 7 protective layer 8 printing section 9 1 to 4 and 6 laminated body 10 Light emitting part 11 sealed bags

Claims (4)

[Claims] 1. An electroluminescent device having at least a transparent anode layer, a light emitting medium layer and a cathode layer,
An electroluminescent element, wherein a protective layer having at least a gas barrier layer and an adhesive layer is laminated in a peelable state on the transparent anode layer side. 2. A protective layer, a front surface sealing layer, a translucent base material layer, a transparent anode layer, a light emitting medium layer, a cathode layer, and at least a back surface sealing layer having a gas barrier layer and a sealant layer are laminated in this order. The electroluminescence element is characterized in that all the end portions of the backside sealing layer are in contact with the protective layer. 3. The electroluminescent device according to claim 1, wherein the protective layer is provided in a resealable state. 4. The one or more printing layers are laminated on at least one surface of the front sealing layer, the back sealing layer or the protective layer, according to any one of claims 1, 2 or 3. The electroluminescent element described.