JP2004259572A - Luminescent coating film and its forming method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a luminescent coating film having a size and a shape which are not achieved with a current EL element, and capable of conducting on/off operation. <P>SOLUTION: The luminescent coating film is formed by laminating a dielectric layer, a light emitting layer, and a transparent conductive layer in this order on a substrate. A conductive layer may be formed on the transparent conductive layer or between a transparent protecting layer and/or the substrate and the dielectric layer. The luminescent coating layer and each of the above layers are formed with their coating materials, and a space between the transparent conductive layer and the substrate or the conductive layer is kept in an electrically insulated state. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a luminescent coating and a method for forming the same.
[0002]
[Prior art]
An EL element including a plurality of layers such as a fluorescent layer is widely used as illumination or a backlight of various display devices. Since each layer forming this EL element is formed by screen printing, there is a limit in the size of the area, and it cannot be applied to a substrate other than a flat surface.
[0003]
It is also known that a paint containing a luminous body is used to form a luminous body layer of this EL element. However, screen printing was required to obtain a phosphor layer from the phosphor paint (see, for example, Patent Document 1). In other words, simply coating the luminous paint and the coating liquid for forming the other layers constituting the EL element by spraying or the like does not function as the EL element due to the formation of a mixed layer between the layers. The problem cannot be solved.
[0004]
On the other hand, fluorescent paints, luminous paints, and self-luminous paints are currently known as luminescent paints. Of these, the fluorescent paint does not emit light unless light is applied, while the phosphorescent paint needs to apply light energy from the outside, and emits light only for a certain period of time and emits only weak light. Also, self-luminous paint. The use of radioactive materials such as tritium and radium has the problem of being dangerous. Further, there is a common problem that the luminescence of the coating film obtained by the above-mentioned three known luminescent coatings cannot be turned on / off.
[0005]
[Patent Document 1]
JP 2000-208046 A
[Problems to be solved by the invention]
An object of the present invention is to obtain a light-emitting coating film having a size and a shape that cannot be achieved by a conventional EL element and capable of being turned on / off.
[0007]
[Means for Solving the Problems]
The light-emitting coating film of the present invention has a dielectric layer, a light-emitting layer, and a transparent conductive layer formed in this order on a substrate, and a transparent protective layer is further formed on the transparent conductive layer. It may be. Further, a conductive layer may be further formed between the base material and the dielectric layer.
[0008]
The method for forming a light-emitting coating film of the present invention is a method for forming a dielectric layer, a light-emitting layer, and a transparent conductive layer on a base material having conductivity. A conductive state between the conductive layer and the transparent conductive layer. Further, another method for forming a luminescent coating film of the present invention is a method for forming a conductive layer, a dielectric layer, a luminescent layer, and a transparent conductive layer on a non-conductive substrate, Is formed by each paint, and the conductive layer and the transparent conductive layer are not electrically connected. In these methods, the formation of each layer by each paint may be performed by spraying. The base material may have a three-dimensional shape, or the formed luminescent coating may have an area of 1.5 m ² or more.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
In the luminescent coating film of the present invention, a dielectric layer, a luminescent layer, and a transparent conductive layer are formed on a substrate in this order. The substrate is not particularly limited, and includes various materials such as plastics such as metals and resins, and ceramic materials. If the surface does not have conductivity among these, a conductive layer described later needs to be formed.
[0010]
Further, the dielectric layer has a dielectric property, for example, high dielectric powder such as titanium oxide, barium titanate, lead titanate, strontium titanate and acrylic resin, polyester resin, epoxy resin, urethane It is composed of a binder component such as resin and fluororesin. In order to increase the dielectric constant of this layer, in addition to increasing the content of the high dielectric powder, a binder component itself having a high dielectric constant or a material having a high dielectric constant such as fluoro rubber is used in combination. be able to.
[0011]
Further, the luminescent layer is, for example, a luminescent powder obtained by adding Cu, Mn, Al, Cl, Br or the like as an activator to zinc sulfide or zinc selenide and firing, and a general binder. It consists of On the other hand, the transparent conductive layer is made of an inorganic oxide such as indium oxide, tin oxide, indium tin oxide or tin oxide, and / or a conductive polymer such as polyethylene dioxythiophene, carbon black, and a general binder. is there.
[0012]
In the luminescent coating film of the present invention, a transparent protective layer may be further formed on the transparent conductive layer. This transparent protective layer is made of a general binder. In the luminescent coating film of the present invention, when the substrate surface does not have conductivity, a conductive layer is formed between the substrate surface and the dielectric layer. The conductive layer may be the one described in the description of the transparent conductive layer, or may include metal particles instead of the inorganic oxide or the conductive polymer. In addition, an electrode for applying a voltage to the transparent conductive layer and the base material or the conductive layer is connected to the luminescent coating film of the present invention.
[0013]
In order for the light-emitting coating film of the present invention to exhibit its function, it is necessary that the above-mentioned transparent conductive layer and the base material or the conductive layer are not electrically connected. That is, the respective layers are not electrically connected, and for that purpose, each layer is preferably cured. Therefore, the binder component of each layer may contain a curing agent such as melamine, isocyanate, or epoxy, or an additive for curing such as a drier when the binder component has an unsaturated bond.
[0014]
In the light-emitting coating film of the present invention, the thickness of each layer is, for example, 20 to 50 μm as a dielectric layer, 50 to 100 μm as a light-emitting layer, and 50 to 100 μm as a transparent conductive layer. Further, the transparent protective layer and the conductive layer provided as needed can have a thickness of 100 to 200 μm and 10 to 20 μm, respectively. The thickness of the entire luminescent coating film is preferably 290 to 470 μm.
[0015]
The method for forming a light-emitting coating film according to the present invention is a method for forming a dielectric layer, a light-emitting layer, and a transparent conductive layer on a substrate, characterized in that these layers are formed by paint. When the substrate is not conductive, a conductive layer is formed between the substrate and the dielectric layer. Here, it is necessary to keep the transparent conductive layer and the base material or the conductive layer from conducting. The paint for forming each layer is composed of the components constituting each layer, which have already been described in the description of the luminescent coating film.
When forming on a relatively large area, it is preferable to use a paint for forming a cured film at room temperature as a paint for forming each of these layers. For that purpose, it is preferable that the above-mentioned curing agent and additives for curing are contained in the binder component in each paint, and the use of isocyanate is particularly effective for curing at room temperature.
[0016]
In the method for forming a luminescent coating film of the present invention, the above layers are sequentially formed on a substrate. When the next layer is formed on the previous layer, the mixed layer between the two layers is prevented, that is, the surface of the formed previous layer is dissolved by application of a paint for forming the next layer. It is necessary to do it in the state that does not. For this reason, it is preferable to use a coating material for forming the first layer and the next layer that is hardly compatible with each other. Forming the next layer after curing the previous layer is effective for preventing the above-mentioned mixed layer, but it is not necessary to completely advance the curing, and the formation of the next layer is not so great as to cause the mixed layer. When the curing has progressed, a paint for forming the next layer may be applied.
[0017]
The substrate in the method for forming a luminescent coating film of the present invention basically constitutes the surface of the structure. That is, the luminescent coating film of the present invention can be formed on the surface of an existing or existing indoor or outdoor object. For example, large structures such as bridges and guardrails, those that constitute buildings such as doors and walls, and articles such as cars, furniture, and mobile phones, some or all of the surface of which, for example, a brush, The formation can be performed by applying a method or means usually used for coating a paint such as a roller or a spray. The formation on a part of the surface means not only a partial meaning but also the formation of characters and designs.
[0018]
The above-mentioned coating is preferably performed by spraying because it can correspond to various substrate shapes. In this case, if the substrate has a three-dimensional shape, the effect is enhanced. In the method for forming a light-emitting coating film of the present invention, the formed light-emitting coating film may have an area of 1.5 m ² or more.
[0019]
【Example】
Example 1
80 parts of BaTiO _3, 20 parts of Daiel G-501 (fluoro rubber manufactured by Daikin Industries, Ltd.), and the following binder components were added and mixed and dispersed to prepare a coating material for forming a dielectric layer.
[0020]
<Binder component>
Acrylic polyol 13.8 parts Coronate HX 5.4 parts Di-n-butyltin dilaurate 0.003 parts Ethyl acetate 75 parts The acrylic polyol has a solid content of 51% by mass, a hydroxyl value of 70 and a number average. The molecular weight is 7000, Coronate HX is an isocyanate manufactured by Nippon Polyurethane Industry with a solid content of 75% by mass, and the solid content of di-n-butyltin dilaurate is 24%.
[0021]
The coating material thus prepared was applied on an aluminum substrate and dried at room temperature for 5 hours to form a dielectric layer.
On this, as a paint for forming a luminous body layer, 60 parts of ZnS added and baked with Cu, 20 parts of Daiel G-501, and a mixture obtained by mixing and dispersing with the above binder component were applied by spraying, After drying at room temperature for 5 hours, a luminescent layer was formed.
Furthermore, an ITO coating liquid (trade name “FPSN”, manufactured by Fuji Titanium Co., Ltd.) was applied thereon as a transparent conductive layer, and dried at room temperature for 10 hours. The above binder component was applied by spraying on the luminescent coating film thus obtained as a transparent clear coating for forming a transparent protective layer, and dried at room temperature for 3 hours.
It was confirmed that light was emitted at a luminance of 30 cd / m ² by applying an AC voltage of 200 V and 400 Hz between the aluminum substrate and the transparent conductive layer.
[0022]
Example 2
An ITO coating solution (trade name “FPSN”, manufactured by Fuji Titanium Co., Ltd.) was applied as a paint for forming a conductive layer on the polyester substrate, and dried at room temperature for 10 hours to form a conductive layer.
On top of this, the coating material for forming the dielectric layer prepared in Example 1 was applied by spraying and dried at normal temperature for 5 hours to form a dielectric layer.
Subsequently, a light-emitting layer, a transparent conductive layer and a transparent protective layer were formed thereon in the same manner as in Example 1. By applying an alternating voltage of 200 V and 400 Hz to the light-emitting coating film obtained in the same manner as in Example 1, it was confirmed that light was emitted at a luminance of 10 cd / m ² .
[0023]
Example 3
In Example 2, a transparent conductive layer was coated in the same manner as above except that 1 part of polyethylenedioxythiophene, which is a conductive polymer, was dissolved in 99 parts of water and dried at 110 ° C. for 1 hour. A luminescent coating was obtained. In the same manner as in Example 1, it was confirmed that light was emitted at a luminance of 5 cd / m ² by applying an AC voltage of 200 V and 400 Hz.
[0024]
Example 4
In Example 2, 5 parts of carbon black and 3 parts of polyethylenedioxythiophene were added and mixed and dispersed in 92 parts of ethanol as a paint for forming a conductive layer, and dried at 50 ° C. for 1 hour. A luminescent coating film was obtained in the same manner except for the following. In the same manner as in Example 1, it was confirmed that light was emitted at a luminance of 10 cd / m ² by applying an AC voltage of 200 V and 400 Hz.
[0025]
【The invention's effect】
Since the light-emitting coating film of the present invention is formed by a paint, it is possible to obtain a size and a shape that could not be achieved by the conventional EL element, and it is possible to turn on / off the light emission which has not been achieved so far. .
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a light-emitting coating film according to one embodiment of the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 luminescent coating film 2 dielectric layer 3 luminescent layer 4 transparent conductive layer 5 transparent protective layer 6 base material

Claims (8)

A luminescent coating in which a dielectric layer, a luminescent layer, and a transparent conductive layer are formed in this order on a substrate. The luminescent coating according to claim 1, wherein a transparent protective layer is further formed on the transparent conductive layer. The luminescent coating film according to claim 1, wherein a conductive layer is further formed between the base material and the dielectric layer. A method for forming a dielectric layer, a light-emitting layer, and a transparent conductive layer on a conductive base material, wherein each of the layers is formed of a coating material, and the base is electrically connected to the transparent conductive layer. A method for forming a luminescent coating film, wherein the luminescent coating film is not formed. A method for forming a conductive layer, a dielectric layer, a luminescent layer, and a transparent conductive layer on a substrate having no conductivity, wherein each of the layers is formed by a coating material, and the conductive layer and the transparent conductive layer are formed. A method for forming a light-emitting coating film, wherein the layer is not electrically connected to the layer. The method for forming a luminescent coating film according to claim 4 or 5, wherein the formation of each layer with each coating material is performed by spraying. The method according to any one of claims 4 to 6, wherein the substrate has a three-dimensional shape. Method of forming a luminescent coating according to any one claims 4-7, wherein the formed luminescent coating has a 1.5 m ² or more areas.

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