KR100550157B1 - Structure of inorganic electro-luminescence lamp using electroconductive organic polymer and electrode composition - Google Patents

Abstract

The present invention relates to a structure of an inorganic electro luminescence lamp and a composition constituting a back electrode, and a structure of an inorganic EL lamp including a back electrode, a bus bar, and a protective layer using conventional carbon particles. By replacing with an aluminum electrode coated with a conductive organic polymer, functional and economical benefits can be obtained at the same time.

Conductive, Polymer, EL, Lamp, Aluminum, Electrode

Description

STRUCTURE OF INORGANIC ELECTRO-LUMINESCENCE LAMP USING ELECTROCONDUCTIVE ORGANIC POLYMER AND ELECTRODE COMPOSITION}

1 is a cross-sectional structure diagram of a general EL lamp.

2 is a cross-sectional structural view of an EL lamp according to the present invention.

The present invention relates to a structure and an electrode composition of an inorganic electroluminescent lamp, and a structure of an inorganic EL lamp including a back electrode, a bus bar, and a protective layer using conventional carbon particles. Functional and economical benefits can be achieved at the same time by substituting aluminum coated with aluminum.

The present invention relates to a structure and an electrode composition of an inorganic electroluminescence lamp using a conductive organic polymer and an aluminum thin film as a back electrode, and more particularly, to an LCD light source, a display light source of an automobile and an aircraft, an illumination lamp of an advertisement. The present invention relates to a structure and an electrode composition of an inorganic EL lamp which can be used as various light sources such as light sources of various interior stage devices.

In general, a sheet-type lamp using an inorganic electroluminescence phenomenon is a front substrate using a transparent substrate including an indium tin oxide or an indium zinc oxide coating on its front surface. A dielectric layer, carbon layer, or silver paste having zinc sulfide (ZnS) as a mother material and a light emitting layer in which activators such as Cu, Cl, I, and Mn are dispersed in an organic binder, and a ferroelectric such as barium titanate (BaTiO ₃ ) as an insulating film. Or it consists of the back electrode which combined these two, and the protective layer of a back electrode.

Since the back electrode layer mainly composed of synthetic carbon powder or pulverized graphite of the EL lamp is mixed with various organic additives for printing and applied on the dielectric, it has a high self impedance, which is a limiting factor in the large area. Although it can be used, there is a problem that is difficult to apply to mass production because of the high cost. In addition, a protective layer that can be printed or coated in consideration of moisture resistance is added to prevent the penetration of moisture, which is harmful to light emission.However, a separate waterproof layer for moisture resistance such as aluminum is required to secure weather resistance that can be used outdoors. .

As an improvement of the conventional carbon electrode, it is possible to expand the application area of the inorganic EL lamp by providing a back electrode which has a low impedance and a waterproof function, which is advantageous for the large area of the EL lamp, and which reduces the manufacturing cost. An object of the present invention is to provide a back electrode structure and an electrode composition by mixing a conductive organic polymer with a binder to be used as a bonding layer between an aluminum thin film and a dielectric to facilitate mass production, excellent waterproof properties, and simplified manufacturing process. .

In order to achieve the above object, the present invention has the following configuration.

The conductive organic polymer emulsion is coated on an aluminum thin film to make an electrode, and the front electrode, the light emitting layer, and the dielectric layer are laminated on a dielectric layer of an EL sheet printed sequentially, thereby completing an inorganic EL lamp.

Aluminum has excellent electrical, thermal conductivity, and waterproof properties, and is light and easy to process. Therefore, the higher the purity, the better the electrical and waterproof properties. In the present invention, since the foil is used in the form of a thin film (foil) aluminum foil is laminated with a plastic film to use aluminum, plastic laminated film.

Although there is no restriction | limiting in the thickness of an aluminum foil, The thickness of a preferable aluminum foil is 6-50 micrometers. In the case of 6 µm or less, defects such as pinholes generated during thin film production cause defects in the light emitting surface, or a decrease in water resistance and moisture resistance, and in the case of 50 µm or more, the overall thickness and weight of the EL lamp are not preferable.

The surface of aluminum is an oxide film is generated by contact with the atmosphere, the cost of performance to remove it does not have a significant decrease in performance, so if it is produced and stored under the appropriate conditions can be used only by normal cleaning operations. In particular, the aluminum surface combined with the conductive coating agent can obtain electrical efficiency by increasing the surface area by etching.

The plastic film is not limited in material and color as long as it is suitable for handling and processing aluminum foil, and the more excellent in durability and moisture permeability. The lamination method of plastic film and aluminum foil is not particularly limited and commercially available methods such as adhesive laminating, die coating and printing are used.

Conductive organic polymers included in the conductive organic polymer emulsion include polyaniline, polyparaphenyl, polypyrrole, polythiophene, polyacetylene, polymethylthiophene, polyisothianaphthene, polyphenylene 1 or 2 or more types selected from sulfide, polyphenylene oxide, polyphenylenevinylene, polythiophenvinylene, polyperinaphthalene (PPN), and baytron P (BAYER), or derivatives thereof Or a mixture of monomers or oligomers and polymers constituting them.

Examples of binders included in the conductive organic polymer emulsion include polyvinyl acetate, polyvinyl alcohol, ethylene vinyl acetate, epoxy silane, acrylic resin emulsion, acrylic modified alkyd resin, urethane acrylate, chloroprene, synthetic rubber latex emulsion, and aqueous vinyl urethane. One or more selected may be used and a dispersing agent, a plasticizer, a stabilizer, or the like may be added for uniform dispersion and stability within the range of maintaining conductivity and adhesion when mixed with the conductive organic polymer.

The method of improving the processability by adding low boiling alcohols such as ethanol and isobutyl alcohol in coating the conductive organic polymer emulsion on the aluminum foil can also be applied to the present invention. It is also possible to add carbon-based additives such as carbon black, Ketjen black, carbon fiber, and conductivity-imparting materials such as metal powders such as copper, silver, and nickel to improve the conductivity of the coating agent within the limits.

The coating method is not limited in equipment such as spin coat, spray, roller, printing, and the like, and is selected in consideration of physical states such as viscosity of the conductive emulsion. However, since one of the important characteristics of the object of the present invention is a uniform luminous effect, the composition of the coating agent should be homogeneous and the coating thickness should be constant. In particular, in the case where the coating thickness is not constant, the uniformity of the thickness should also be ensured since the light emitting surface becomes uneven due to the change of the local impedance value. After coating, the coated surface needs to be dried using a hot air circulation device or an oven. There is a risk of deterioration or pollution due to prolonged exposure to the atmosphere. The thickness of the coating should be determined in consideration of the electrical conductivity of the mixture, the adhesion and the state of the surface to be deposited. If the coating film is too thin, the adhesive strength is lowered. On the contrary, if the coating film is too thick, the cost is increased and the resistance is increased.

The higher the conductivity of the conductive organic polymer coating film thus prepared is advantageous, but the cost increase due to the price of the conductive organic polymer should be considered. As the coating thickness is thinner, the conductivity increases as the adhesive strength allows. The surface resistance of the coated surface can be reduced to 0.01 ~ 1ohm by maintaining good adhesion with the aluminum thin film even though the self-resistance of the conductive organic polymer coating film itself is high. Because. Based on the embodiment of the present invention, the coating thickness is 1 ~ 4㎛, the surface resistance of the coating surface is 0.01 ~ 1ohm, the adhesion between the aluminum thin film and the dielectric layer is preferably 400 ~ 1000gf / 25mm or more.

Thus prepared aluminum thin film formed with a coating film is cut to an appropriate size and bonded to the dielectric layer. At this time, the adhesive uses a hot press or a general-purpose laminator. The lamination speed, temperature, and pressure are controlled according to the composition of the coating agent. Excessive temperature and pressure may destroy or alter the laminated structure of the EL, and thus, a heating plate temperature of 100 to 150 ° C. and a pressure of 1 to 2 kg are preferable.

It is also possible to coat the conductive organic polymer emulsion on a dielectric layer instead of an aluminum thin film, and to apply the conductive organic polymer emulsion. Such a method does not correspond to the spirit of the present invention, but as a result, it is not limited only to the method of coating on an aluminum thin film.

The electrode composition may be polyaniline, polyparaphenyl, polypyrrole, polythiophene, polyacetylene, polymethylthiophene, polyisothianaphthene, polyphenylene sulfide, polyphenylene oxide, poly 50 to 96% of a conductive organic polymer which is one or a mixture of two or more selected from phenylene vinylene, polythiophene vinylene, polyperinaphthalene (PPN), or a derivative thereof or a mixture of monomers or oligomers and polymers constituting them. ; 4 to 50 weight of binder consisting of at least one of polyvinyl acetate, polyvinyl alcohol, ethylene vinyl acetate, epoxy silane, acrylic resin emulsion, acrylic modified alkyd resin, urethane acrylate, chloroprene, synthetic rubber latex emulsion and aqueous vinyl urethane The% is mixed to form a conductive organic polymer emulsion.

The conductive organic polymers and binders described above have a limited type, but those skilled in the art will be able to sufficiently change the design using similar components.

Hereinafter, a description will be given in more detail through the embodiment of the production of the aluminum electrode containing the conductive organic polymer.

Example 1

Zinc sulfide (ZnS) is used as a mother material on a transparent electrode coated with indium tin oxide or indium zinc oxide, and active agents such as Cu, Cl, I, and Mn are applied to the organic binder. A dielectric layer using a dispersed light emitting layer and a ferroelectric such as barium titanate (BaTiO ₃ ) as an insulating film is sequentially laminated by screen printing. As a back electrode, a transparent biaxially stretched PET film having a thickness of 50 μm and a width of 1,000 mm was laminated on one side of an aluminum foil having a purity of 99.4%, a thickness of 25 μm, and a width of 1,000 mm using a two-component urethane adhesive. This is again dried in a hot air drying chamber for 48 hours to remove residual solvent and stabilize adhesion.

The transparent electrode on the front formed a busbar with a silver paste of 10 micrometers in thickness and a width of 5 mm, and the power and connection part used a copper tape of 35 micrometers in thickness and 5 mm in width. . The back electrode was cut to the same size as the previously prepared dielectric layer and made a connection with the power source using only copper tape having a width of 5 mm without forming a separate bus bar.

The operating power was supplied at a voltage of 150rms and 400Hz by using a voltage frequency converter, and the surface resistance [ohm], power consumption [W], brightness [cd], and adhesion strength of the conductive coating layer were applied to the samples manufactured in each example. / 25 mm] was measured.

Fabrication of conductive organic polymer coating film

Example 2

In the coating operation, isobutyl alcohol was mixed for uniform coating thickness and ease of operation. Carbon black and nickel powder added as the conductive imparting material are added to increase the conductivity of the coating film itself. Smaller particle size is advantageous for homogeneous film formation, and the maximum particle diameter of each powder should be less than 3 micron since it should not exceed the thickness of the coating film.

After roller coating on aluminum foil, conductive organic polymer emulsion made by adding 3% by weight of polyvinyl alcohol and 2% by weight of isobutyl alcohol to 95% by weight of conductive organic polymer Baytron P (BAYER) A laminator is bonded onto the dielectric layer. At this time, a heating temperature of 130 ° C., a pressure of 1 kg, and a running speed of 1 m / min are maintained.

Example 3

A conductive organic polymer emulsion formed by adding 4% by weight of polyvinyl alcohol, 4% by weight of carbon black, and 2% by weight of isobutyl alcohol to 90% by weight of conductive organic polymer Baytron P (BAYER) was rolled onto aluminum foil. After the roller is coated, it is laminated using a laminator on the dielectric layer. At this time, the heating temperature is maintained at 130 ° C., the pressure of 1 kg, and the running speed of 1 m / min.

Example 4

To 90% by weight of conductive organic polymer BAYER P, 4% by weight of polyvinyl alcohol, 4% by weight of nickel powder, and 2% by weight of isobutyl alcohol were added to the aluminum foil. After the roller is coated, it is laminated using a laminator on the dielectric layer. At this time, the heating temperature is maintained at 130 ° C., the pressure of 1 kg, and the running speed of 1 m / min.

Example 5

Conductive organic polymer Conductive organic polymer made by adding 4% by weight of polyvinyl alcohol, 2% by weight of carbon black, 2% by weight of nickel powder and 2% by weight of isobutyl alcohol to 90% by weight of baytron P (BAYER) The emulsion is coated on aluminum foil using a roller and then laminated using a laminator on the dielectric layer. At this time, the heating temperature is maintained at 130 ° C., the pressure of 1 kg and the running speed of 1 m / min.

The measurement results of Examples 2 to 5 are shown in the table below.

Table 1

Surface resistance [ohm] Power Consumption [watt / ㎠] Luminance [cd / ㎡] Adhesive force [g / 25mm] Example 2 0.11 0.027 122.7 650 Example 3 0.03 0.028 96.2 410 Example 4 0.02 0.026 110.4 550 Example 5 0.02 0.02 97 450

This invention can be implemented in other various forms, without deviating from the mind or main characteristic. The above-described embodiments are merely examples in all respects and should not be interpreted limitedly. The scope of the invention is indicated by the claims, and is not limited by the text of the specification. Again, all variations and modifications belonging to the equivalent scope of the claims are within the scope of the present invention.

As described above, the present invention mixes the conductive organic polymer with a binder (binder) to form a conductive coating which can be adhered, and the back electrode composition and the back electrode of the inorganic EL lamp coated on the aluminum thin film using a general coating facility. Is a structure of an inorganic EL lamp completed by laminating a hot press or a laminator. According to the present invention, the durability and weather resistance of the inorganic EL lamp are improved, as well as the advantage of large area, and thus the application area thereof is expanded.

In addition, since the manufacturing process is simplified according to the present invention, it is possible to reduce the production cost of the product and obtain an economic effect of enhancing the competitiveness.

Claims (7)

In that the front electrode, the light emitting layer, and the dielectric layer are printed one after another, Polyaniline, polyparaphenyl, polypyrrole, polythiophene, polyacetylene, polymethylthiophene, polyisothianaphthene, polyphenylene sulfide, polyphenylene oxide, polyphenylenevinylene Conductive organic polymer which is one or two or more selected from polythiophenevinylene, polyperinaphthalene (PPN) and baytron P, or a derivative thereof or a mixture of monomers or oligomers and polymers constituting them. (A) 50-96%; and At least one binder (B) selected from polyvinyl acetate, polyvinyl alcohol, ethylene vinyl acetate, epoxy silane, acrylic resin emulsion, acrylic modified alkyd resin, urethane acrylate, chloroprene, synthetic rubber latex emulsion, aqueous vinyl urethane 4 An electrode made by coating a conductive organic polymer emulsion formed by mixing a thin film of aluminum to 50 wt%;  Inorganic EL lamp structure using a conductive polymer, characterized in that the laminated on the dielectric layer. delete delete The method of claim 1, wherein the conductive organic polymer emulsion has a thickness of 1 ~ 4㎛, surface resistance 0.01 ~ 1ohm and the adhesion between the aluminum thin film and the dielectric layer is 400 ~ 1000gf / 25mm using a conductive polymer, characterized in that the coating on the aluminum thin film Inorganic EL lamp structure. The inorganic EL lamp structure using a conductive polymer according to claim 1, wherein the coating is made at a pressure of 1 to 2 kg at a heating plate temperature of 100 to 150 캜. The inorganic EL lamp structure using a conductive polymer according to claim 1, wherein the aluminum thin film maintains a thickness of 6 to 50 µm. Polyaniline, polyparaphenyl, polypyrrole, polythiophene, polyacetylene, polymethylthiophene, polyisothianaphthene, polyphenylene sulfide, polyphenylene oxide, polyphenylenevinylene 50 to 96% of a conductive organic polymer which is a mixture of one or two or more selected from polythiophenevinylene and polyperinaphthalene (PPN), or derivatives thereof, or a mixture of monomers or oligomers and polymers constituting them; 4 to 50 weights of at least one binder selected from polyvinyl acetate, polyvinyl alcohol, ethylene vinyl acetate, epoxy silane, acrylic resin emulsion, acrylic modified alkyd resin, urethane acrylate, chloroprene, synthetic rubber latex emulsion, aqueous vinyl urethane %; An inorganic EL lamp electrode composition using a conductive polymer, which is a conductive organic polymer emulsion formed by mixing.

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