CN114340073A - Double-sided light-emitting electroluminescent film, preparation method and electroluminescent signboard - Google Patents
Double-sided light-emitting electroluminescent film, preparation method and electroluminescent signboard Download PDFInfo
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Abstract
The invention relates to a double-sided light-emitting electroluminescent film, a preparation method and an electroluminescent signboard. The double-sided light-emitting electroluminescent film comprises a light-emitting layer; two sides of the luminescent layer are respectively provided with a layer of transparent organic medium layer, and each layer of transparent organic medium layer is respectively provided with a layer of transparent conductive film; the luminescent layer is non-transparent; the components of the material comprise a luminescent material and a resin with high dielectric constant; the composition of any one of the transparent organic medium layers includes a high dielectric constant resin. The transparent organic medium layer is arranged between the transparent conductive film and the light-emitting layer, so that double-sided light-emitting display can be realized by only one light-emitting layer and the transparent medium layers arranged on two sides of the light-emitting layer, the thickness of the whole device is reduced, the manufacturing process is simplified, and the manufacturing cost is reduced.
Description
Technical Field
The invention relates to the technical field of electroluminescence, in particular to a double-sided light-emitting electroluminescence film, a preparation method and an electroluminescence signboard.
Background
Most of the existing light-emitting devices adopt LEDs to achieve local light-emitting indication effect, and the light-emitting range is small. As the technology has been continuously developed, an electroluminescent device (EL device) has gradually replaced the LED as a new light emitting device.
In some outdoor display devices, it is often necessary to use a double-sided light-emitting electroluminescent film for double-sided display. However, in a general electroluminescent device, the material of the dielectric layer is usually made of inorganic particles with high dielectric constant, such as barium titanate, barium sulfate, and titanium dioxide. The presence of these inorganic particles makes the dielectric layer opaque, and therefore the position of the light-emitting layer is between the dielectric layer and the conductive film. When the light-emitting device needs to be manufactured to emit light on two sides, two light-emitting layers need to be arranged respectively to enable the light-emitting layers to emit light together with the corresponding dielectric layer and the corresponding conductive film.
The double-sided light-emitting electroluminescent device has the advantages of larger thickness, more complex preparation process and higher cost.
Disclosure of Invention
The invention aims to solve the technical problem of providing a double-sided light-emitting electroluminescent film, a preparation method and an electroluminescent signboard.
The technical scheme for solving the technical problems is as follows:
the invention provides a double-sided light-emitting electroluminescent film, which comprises a light-emitting layer; two sides of the light-emitting layer are respectively provided with a transparent organic medium layer, and each transparent organic medium layer is respectively provided with a transparent conductive film; the luminescent layer is non-transparent; the components of the material comprise a luminescent material and a resin with high dielectric constant; the organic medium layer comprises resin with high dielectric constant.
The technical scheme of the invention has the beneficial effects that: the invention adopts the transparent organic medium layer, so that the transparent organic medium layer can be positioned between the transparent conductive film and the luminous layer, thus, only one luminous layer is needed, and the transparent medium layers are arranged at the two sides of the luminous layer, thereby realizing double-sided luminous display, reducing the thickness of the whole device, simplifying the manufacturing process and reducing the manufacturing cost.
The invention can be realized by the following further technical scheme:
further, the transparent conductive film comprises a conductive material, and the conductive material is one of ITO, silver nanowires, conductive polymers, graphene and carbon nanotubes.
The beneficial effect of adopting the further technical scheme is that: the electroluminescent film of the invention has wide applicability.
Further, the luminescent layer is formed by drying the following solution of the components in percentage by mass: 43-56% ZnS: cu luminescent material, 40-52% of epoxy resin, 2-3% of curing agent and 1-3% of organic solvent.
The beneficial effect of adopting the further technical scheme is that: the light-emitting layer containing the above components is in a non-transparent form, so that patterns on both sides of the light-emitting layer can be independently displayed without mutual influence, thereby effectively improving the use effect of the electroluminescent thin film.
Further, the thickness of the light emitting layer is 20 to 25 μm.
The beneficial effect of adopting the further technical scheme is that: the light-emitting layer within the thickness range can not only ensure that enough brightness is provided for two sides, but also avoid the problem that the electroluminescent film is too thick due to too thick thickness.
Further, the components of the transparent organic medium layer are formed by drying the following solutions in percentage by mass: 50% polyacrylonitrile and 50% N, N-dimethylformamide.
The beneficial effect of adopting the further technical scheme is that: the components are used as the transparent organic medium layer, and the high dielectric constant of polyacrylonitrile can be utilized to enable the polyacrylonitrile to have the isolation function of the electroluminescent medium layer.
Further, the transparent organic medium layer is formed by drying the following solutions in percentage by mass: 90-95% of thermosetting phenolic resin and 5-10% of curing agent.
The beneficial effect of adopting the further technical scheme is that: thermosetting phenolic resins are another component that can be used as a material for the transparent organic dielectric layer. It has the characteristics of stability, heat resistance, flame retardance and good electrical insulation performance.
Furthermore, the thickness of each transparent organic medium layer is 20-25 μm.
The beneficial effect of adopting the further technical scheme is that: the transparent organic medium layer with the thickness range can effectively isolate the light-emitting layer from the transparent conductive film, and can avoid the problem that the electroluminescent film is too thick due to too thick thickness.
The invention provides a preparation method of the double-sided light-emitting electroluminescent film, which comprises the following steps:
respectively preparing a solution of the light-emitting layer and a solution of the transparent organic medium layer;
coating a layer of solution of the transparent organic medium layer on a layer of the transparent conductive film, and drying at the temperature of 110 ℃ for 20 min;
coating the solution of the luminescent layer on the layer of the transparent organic medium layer obtained after drying, and drying at the drying temperature of 110 ℃ for 20 min;
coating another layer of solution of the transparent organic medium layer on the luminescent layer obtained after drying, and drying at the drying temperature of 110 ℃ for 20 min;
and attaching another layer of the transparent conductive film to the other layer of the transparent organic medium layer obtained after drying.
Further, the coating method is screen printing or spray painting.
The invention provides a double-sided luminous electroluminescent signboard, which comprises the electroluminescent film, a transparent substrate and a transparent protective layer; the transparent substrate and the transparent protective layer are respectively positioned on two sides of the electroluminescent film and are respectively fixed with one layer of the transparent conductive film.
Drawings
FIG. 1 is a schematic structural diagram of a double-sided electroluminescent film and an electroluminescent signboard of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a transparent substrate; 2. a light emitting layer; 3. a transparent organic dielectric layer; 4. a transparent conductive film; 5. and a transparent protective layer.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, the double-sided light-emitting electroluminescent film of the present invention includes a light-emitting layer 2; two sides of the luminescent layer 2 are respectively provided with a layer of transparent organic medium layer 3, and each layer of transparent organic medium layer 3 is respectively provided with a layer of transparent conductive film 4; the luminescent layer 2 is non-transparent; the components of the material comprise a luminescent material and a resin with high dielectric constant; the composition of the transparent organic medium layer 3 includes a resin having a high dielectric constant.
The invention adopts the transparent organic medium layer 3, so that the transparent organic medium layer can be positioned between the transparent conductive film 4 and the luminous layer 2, thus, only one luminous layer is needed, and the transparent medium layers are arranged at the two sides of the luminous layer, thereby realizing double-sided luminous display, reducing the thickness of the whole device, simplifying the manufacturing process and reducing the manufacturing cost.
The transparent property of the transparent organic dielectric layer 3 of the present invention is to make the dielectric layer transparent by using the organic component of the resin with high dielectric constant, thus changing the non-transparent property of the conventional inorganic component dielectric layer.
The electroluminescent film of the invention has the advantages that the patterns displayed on the two sides are not influenced mutually, the electroluminescent film can be widely applied to the fields of identification and advertisement, the thickness of an electroluminescent device is effectively reduced, and the production process can be simplified.
Theoretically, the transparent organic medium layer 3 may be made of a transparent material having a high dielectric constant. In the present invention, the following examples are specifically mentioned:
in one embodiment of the present invention, the composition of the transparent organic medium layer 3 is composed of the following components in percentage by mass: 50% Polyacrylonitrile (PAN) and 50% N, N-Dimethylformamide (DMF).
Polyacrylonitrile is obtained by free radical polymerization of acrylonitrile monomer. Polyacrylonitrile is often used for manufacturing products such as fibers and can also be used in ionic polymer batteries, but the polyacrylonitrile is not used in electroluminescent devices at present. N, N-dimethylformamide is an organic solvent used in combination with polyacrylonitrile. The components are adopted as the transparent organic medium layer 3, and the high dielectric constant of polyacrylonitrile can be utilized to enable the polyacrylonitrile to have the isolation function of the electroluminescent medium layer.
In another embodiment of the present invention, the transparent organic medium layer 3 is composed of the following components: 90-95% of thermosetting phenolic resin and 5-10% of curing agent.
Thermosetting phenol resin is another component that can be used as the material of the transparent organic medium layer 3. It has the characteristics of stability, heat resistance, flame retardance and good electrical insulation performance.
Preferably, the curing agent is p-toluenesulfonic acid.
Preferably, the thickness of each transparent organic medium layer 3 is 20-25 μm; the transparent organic medium layer 3 within the thickness range can effectively isolate the light-emitting layer 2 from the transparent conductive film 4, and can also avoid the problem that the light-emitting brightness is reduced due to the fact that the electroluminescent film is too thick due to too thick thickness.
Preferably, the conductive material of the transparent conductive film 4 is one of ITO, silver nanowires, conductive polymers, graphene, and carbon nanotubes; the conductive material of the transparent conductive film 4 of the present invention can be selected from the above-mentioned various conventional specific types, so that the electroluminescent thin film of the present invention has wide applicability.
In the components of the light-emitting layer 2 of the present invention, the light-emitting material is an inorganic electroluminescent material, such as ZnS: cu and Mn; ZnS: cu and Al; ZnS: inorganic substances such as Cu; the inorganic substances are used as the luminescent materials, so that the method has the advantages of low cost and simple manufacturing process.
In one embodiment of the present invention, the light-emitting layer 2 is composed of, in mass percent: 43-56% ZnS: cu luminescent material, 40-52% of epoxy resin, 2-3% of curing agent and 1-3% of organic solvent; the light-emitting layer 2 containing the above components is in a non-transparent form, so that patterns on both sides of the light-emitting layer 2 can be independently displayed without affecting each other, thereby effectively improving the use effect of the electroluminescent thin film.
Further, it is preferable that the light emitting layer 2 is composed of, in mass percent: 50% of ZnS: cu luminescent material, 46% of epoxy resin, 3% of curing agent and 1% of organic solvent.
Preferably, the thickness of the light-emitting layer 2 is 20 to 25 μm; the light-emitting layer 2 within this thickness range can ensure sufficient brightness to both sides, and can avoid the problem of the electroluminescent film itself being too thick due to too thick thickness.
The preparation method of the double-sided light-emitting electroluminescent film comprises the following steps:
1) respectively preparing solutions of the luminescent layer 2 and the transparent organic medium layer 3;
2) coating a layer of solution of a transparent organic medium layer 3 on a layer of transparent conductive film 4, and drying at the temperature of 110 ℃ for 20 min;
3) coating the solution of the luminescent layer 2 on the dried layer of the transparent organic medium layer 3, and drying at the drying temperature of 110 ℃ for 20 min;
4) coating another layer of solution of the transparent organic medium layer 3 on the luminescent layer 2, and drying at the temperature of 110 ℃ for 20 min;
5) and another layer of transparent conductive film 4 is attached to the other layer of transparent organic medium layer 3.
In the above steps, the coating method is screen printing or spray painting.
The preparation method has the advantages of simple steps and easy operation.
The electroluminescent film of the invention can be used for various devices needing double-sided light emission, such as signboards, advertising boards, indication boards and the like. For different patterns to be displayed, the patterns can be obtained by directly spraying and painting on the transparent conductive film 4 in a UV spraying and painting mode.
As shown in fig. 1, the double-sided electroluminescent signboard of the present invention comprises the above electroluminescent film, a transparent substrate 1 and a transparent protective layer 5; the transparent substrate 1 and the transparent protective layer 5 are respectively positioned at two sides of the electroluminescent film and are respectively fixed with a layer of transparent conductive film 4.
Preferably, the fixing mode is bonding or fixing through screws.
Preferably, the transparent substrate 1 and the transparent protective layer 5 are made of PC or acrylic plate, respectively.
It should be noted that the area of the transparent substrate 1 and the transparent protective layer 5 is generally larger than that of the electroluminescent film, and the total thickness of the electroluminescent film is smaller, so that the transparent substrate 1 is also fixedly connected to the transparent protective layer 5, so that the electroluminescent film is fixed therebetween.
The technical solution of the present invention is illustrated by the following examples:
example 1
In the embodiment, the double-sided light-emitting electroluminescent film is adopted to prepare the electroluminescent signboard. Wherein, the thickness and the material of each layer of the double-sided luminous electroluminescent film are respectively as follows:
the components of the luminescent layer 2 are: 43% of ZnS: cu luminescent material, 52% of epoxy resin, 3% of curing agent and 2% of organic solvent. The thickness of the light-emitting layer 2 was 20 μm.
The two transparent organic medium layers 3 positioned at the two sides of the luminescent layer 2 comprise the following components: 50% Polyacrylonitrile (PAN) and 50% N, N-Dimethylformamide (DMF). The thickness of each transparent organic medium layer 3 was 20 μm.
The conductive material of the two transparent conductive films 4 is ITO.
In this embodiment, the transparent substrate 1 and the transparent protective layer 5 of the electroluminescent signboard are both made of PC.
Example 2
In the embodiment, the double-sided light-emitting electroluminescent film is adopted to prepare the electroluminescent signboard. Wherein, the thickness and the material of each layer of the double-sided luminous electroluminescent film are respectively as follows:
the components of the luminescent layer 2 are: 56% of ZnS: cu luminescent material, 40% of epoxy resin, 2% of curing agent and 2% of organic solvent. The thickness of the light-emitting layer 2 was 25 μm.
The two transparent organic medium layers 3 positioned at the two sides of the luminescent layer 2 comprise the following components: 95% of thermosetting phenolic resin and 5% of curing agent. The thickness of each transparent organic medium layer 3 was 25 μm.
The conductive material of the two transparent conductive films 4 is silver nanowires.
In this embodiment, the transparent substrate 1 and the transparent protective layer 5 of the electroluminescent signboard are both made of acrylic.
Example 3
In the embodiment, the double-sided light-emitting electroluminescent film is adopted to prepare the electroluminescent signboard. Wherein, the thickness and the material of each layer of the double-sided luminous electroluminescent film are respectively as follows:
the components of the luminescent layer 2 are: 50% of ZnS: cu luminescent material, 46% of epoxy resin, 3% of curing agent and 1% of organic solvent. The thickness of the light-emitting layer 2 was 23 μm.
The transparent organic medium layer 3 on one side of the luminescent layer 2 comprises the following components: 50% Polyacrylonitrile (PAN) and 50% N, N-Dimethylformamide (DMF). The thickness of the transparent organic medium layer 3 is 22 μm.
The transparent organic medium layer 3 positioned at the other side of the luminescent layer 2 comprises the following components: 93% of thermosetting phenolic resin and 7% of curing agent. The thickness of the transparent organic medium layer 3 is 23 μm.
The conductive material of the two transparent conductive films 4 is graphene.
In this embodiment, the transparent substrate 1 and the transparent protective layer 5 of the electroluminescent signboard are both made of PC.
The double-sided light-emitting electroluminescent film and the signboard prepared from the double-sided light-emitting electroluminescent film in the embodiments 1 to 3 have good light-emitting effects, and double-sided light emission and pattern display cannot influence each other, so that the double-sided light-emitting electroluminescent film and the signboard prepared from the double-sided light-emitting electroluminescent film have good display and marking effects.
The electroluminescent film and the electroluminescent signboard prepared by the same can realize double-sided light emission and independent display of double-sided patterns under the condition of only one light-emitting layer 2, so that the thickness of the electroluminescent film is lower than that of the conventional double-sided light-emitting film.
In the description of the present invention, it should be noted that the terms "thickness", "upper", "lower", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "one layer" and "another layer" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A double-sided light-emitting electroluminescent film is characterized by comprising a light-emitting layer (2); two sides of the light-emitting layer (2) are respectively provided with a layer of transparent organic medium layer (3), and each layer of transparent organic medium layer (3) is respectively provided with a layer of transparent conductive film (4);
the luminescent layer (2) is non-transparent; the components of the material comprise a luminescent material and a resin with high dielectric constant;
the components of the transparent organic medium layer (3) comprise high-dielectric-constant resin.
2. A double sided light emitting electroluminescent film as claimed in claim 1, wherein the composition of the transparent conductive film (4) comprises a conductive material, and the conductive material is one of ITO, silver nanowire, conductive polymer, graphene, and carbon nanotube.
3. A double-sided light-emitting electroluminescent film as claimed in claim 1, characterized in that the light-emitting layer (2) is formed by baking a solution of the following components in mass percent: 43-56% ZnS: cu luminescent material, 40-52% of epoxy resin, 2-3% of curing agent and 1-3% of organic solvent.
4. A double sided light emitting electroluminescent film as claimed in claim 3, characterized in that the thickness of the light emitting layer (2) is 20-25 μm.
5. A double-sided light-emitting electroluminescent film as claimed in claim 1, characterized in that the composition of the transparent organic medium layer (3) is formed by baking a solution of the following components in mass percent: 50% polyacrylonitrile and 50% N, N-dimethylformamide.
6. A double-sided light-emitting electroluminescent film as claimed in claim 1, characterized in that the transparent organic dielectric layer (3) is formed by baking a solution of the following components in mass percent: 90-95% of thermosetting phenolic resin and 5-10% of curing agent.
7. A double sided light emitting electroluminescent film as claimed in claim 5 or 6, characterized in that the thickness of each of said transparent organic medium layers (3) is 20-25 μm.
8. A preparation method of the double-sided light-emitting electroluminescent film as claimed in any one of claims 1 to 7, characterized by comprising the following steps:
respectively preparing a solution of the light-emitting layer (2) and a solution of the transparent organic medium layer (3);
coating a layer of solution of the transparent organic medium layer (3) on a layer of the transparent conductive film (4), and drying at the temperature of 110 ℃ for 20 min;
coating the solution of the light-emitting layer (2) on the layer of the transparent organic medium layer (3) obtained after drying, and drying at the temperature of 110 ℃ for 20 min;
coating another layer of solution of the transparent organic medium layer (3) on the luminescent layer (2) obtained after drying, and drying at the temperature of 110 ℃ for 20 min;
and attaching another layer of the transparent conductive film (4) to the other layer of the transparent organic medium layer (3) obtained after drying.
9. The method for preparing a double-sided light-emitting electroluminescent film as claimed in claim 8, wherein the coating method is screen printing or spray painting.
10. A double-sided light-emitting electroluminescent signboard, which comprises the electroluminescent film as claimed in any one of claims 1 to 7, a transparent substrate (1) and a transparent protective layer (5);
the transparent base material (1) and the transparent protective layer (5) are respectively positioned at two sides of the electroluminescent film and are respectively fixed with one layer of the transparent conductive film (4).
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| CN202111648811.9A CN114340073A (en) | 2021-12-30 | 2021-12-30 | Double-sided light-emitting electroluminescent film, preparation method and electroluminescent signboard |
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| CN202111648811.9A CN114340073A (en) | 2021-12-30 | 2021-12-30 | Double-sided light-emitting electroluminescent film, preparation method and electroluminescent signboard |
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| US5691738A (en) * | 1994-03-30 | 1997-11-25 | Nippondenso Co., Ltd. | Thin-film electroluminescent display and method of fabricating same |
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