KR102052077B1 - Electrochromic device with single transparent conductive substrate - Google Patents

Abstract

The present invention relates to an electrochromic device with a single transparent conductive substrate and, more specifically, to an electrochromic device with a single transparent conductive substrate, which can reduce production cost and labor by being implemented with one transparent conductive substrate instead of two transparent conductive substrates provided in a conventional electrochromic device, and can alleviate the difficulties in implementing a large-area electrochromic device, that is a limitation of a method for injecting a liquid electrolyte. The present invention comprises: a transparent conductive substrate having one side etched on the substrate to form a first transparent electrode layer; a first color change material layer including a first color change material stacked on the first transparent electrode layer; an electrolyte layer disposed on the first color change material layer; a second color change material layer disposed on the electrolyte layer and including a second color change material; a second transparent electrode layer having one side disposed on the second color change material layer and the other side formed in an area, where the first transparent electrode layer is etched, on the transparent conductive substrate wherein one side and the other side are connected to each other; and a bus electrode layer disposed on each of the first transparent electrode layer and the second transparent electrode layer to make power supplied from the outside.

Description

Electrochromic device with single transparent conductive substrate

The present invention relates to an electrochromic device having a single transparent conductive substrate, and more particularly, by implementing two transparent conductive substrates provided in the existing electrochromic device as a single transparent conductive substrate, it is possible to reduce production costs and reduce labor. The present invention relates to an electrochromic device having a single transparent conductive substrate that can solve the difficulty of implementing a large-area electrochromic device, which is a limitation of the method of injecting a liquid electrolyte.

Electrochromism is a phenomenon in which a color is reversibly changed in the electric field direction when a voltage is applied. An element having such characteristics is called an electrochromic device. The electrochromic device loses electrons depending on the electric field direction, and the oxidizing material loses electrons and becomes colored. The reducing material loses electrons and does not have color when the oxidizing material acquires electrons.

The electrochromic device maintains a transparent state by controlling electricity and can selectively adjust visible light and ultraviolet light reversibly when necessary, so that environmentally friendly needs such as energy saving, privacy requirements, and aesthetic design As interest increases, there is a growing interest in applications such as architectural windows, hospital partitions, conference room windows, automobile glass, transparent displays, and sports goggles.

1 is a view showing a general electrochromic device.

As described above, the electrochromic device is manufactured by inserting a discoloring material and an electrolyte between two transparent conductive oxides (TCOs). The discoloring material is mixed with an electrolyte, and discolored as shown in FIG. 1. The material is formed on both transparent electrodes, or the battery-like type on which the discoloration material is formed on one side, and the discoloration material is formed on only one side of the transparent electrode, and the other discoloration material is mixed on the electrolyte. It can be divided into hybrid type.

Such an electrochromic device has a structure in which an electrolyte is filled between a film in which oxidizing and reducing materials are formed on both transparent conductive substrates. Therefore, when a liquid electrolyte is injected, an electrochromic device having a small size such as 50 X 50 mm is manufactured. Although possible, problems arise that are not suitable for the manufacture of electrochromic devices larger than 100 x 100 mm.

In addition, in the case of a liquid electrolyte, it is difficult to seal the electrolyte due to expansion of the solvent, and if it is broken, problems due to leakage of the electrolyte should be considered. In the case of an electrolyte containing a high viscosity polymer and an ionic liquid, holes There is a problem that is not easy in the electrolyte injection process.

The present invention has been made to solve the above problems to form an electrolyte layer through the UV curing and thermal curing on the first color change material layer to eliminate the problems caused by the injection of the existing liquid electrolyte and the existing upper and lower substrates It is an object of the present invention to provide an electrochromic device having a single transparent conductive substrate capable of reducing production costs and labor, as two substrates consisting of two substrates can be replaced with a single transparent conductive substrate.

The present invention has the following features to achieve the above object.

The present invention includes a transparent conductive substrate on which one side is etched on a substrate to form a first transparent electrode layer; A first color change material layer including a first color change material stacked on the first transparent electrode layer; An electrolyte layer disposed on the first color change material layer; A second color change material layer disposed on the electrolyte layer and including a second color change material; A second transparent electrode layer having one side disposed on the second color change material layer and the other side formed in a region where the first transparent electrode layer is etched on the transparent conductive substrate, and one side and the other side connected to each other; And a bus electrode layer disposed on each of the first transparent electrode layer and the second transparent electrode layer to supply power from the outside.

In addition, according to another aspect of the present invention, a transparent conductive substrate having two first transparent electrode layers separated by etching on one side thereof on a substrate; A first color change material layer comprising a first color change material stacked on any one of the first transparent electrode layers; An electrolyte layer disposed on the first color change material layer; A second color change material layer disposed on the electrolyte layer and including a second color change material; A second transparent electrode layer having one side disposed on the second color change material layer and the other side formed on the other first transparent electrode layer, and having one side and the other side connected to each other; And a bus electrode layer disposed on each of the first transparent electrode layer and the second transparent electrode layer to supply power from the outside.

Here, the first color change material layer is made of any one of an oxide material or a reducing material, the second color change material layer is made of any one other than the first color change material layer of the oxide material or reducing material, the first color change material layer And the second color change material layer are coated and dried on the first transparent electrode layer and the electrolyte layer, respectively, and the first color change material layer is subjected to high temperature baking after drying.

According to the present invention, the electrolyte layer is formed on the first color change material layer through UV curing and thermal curing, thereby removing various problems caused by the injection of the existing liquid electrolyte.

In addition, since two substrates consisting of upper and lower substrates can be replaced with a single transparent conductive substrate, there is an effect of reducing production cost and labor.

1 is a view showing a general electrochromic device.
2 is a view showing an electrochromic device according to an embodiment of the present invention.
3 is a view showing an electrochromic device according to another embodiment of the present invention.

In order to explain the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, the following describes exemplary embodiments of the present invention and looks at it with reference.

First, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention, and singular forms may include plural forms unless the context clearly indicates otherwise. Also in this application, terms such as "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, one or more other It is to be understood that the present invention does not exclude the possibility of the presence or the addition of features, numbers, steps, operations, components, parts, or a combination thereof.

In describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

2 is a view showing an electrochromic device according to an embodiment of the present invention.

Referring to the drawings, the electrochromic device 100 according to an embodiment of the present invention is a transparent conductive substrate on which one side is etched on the substrate 10 to form a first transparent electrode layer 20, and the first transparent electrode layer ( 20) a first color change material layer 30 including a first color change material stacked on the layer, an electrolyte layer 40 disposed on the first color change material layer, and is disposed on the electrolyte layer 40 The second color change material layer 50 including the second color change material and one side is disposed on the second color change material layer 50 and the other side is formed in the region where the first transparent electrode layer is etched on the transparent conductive substrate. The bus electrode layer 70 is disposed on the second transparent electrode layer 60 and the first transparent electrode layer 20 and the second transparent electrode layer 60, one side and the other side of which are connected to each other to supply power from the outside. It is made, including.

Here, the substrate 10 may be a transparent material having a transmittance (T%) of 98% or more, and may be glass, plastic, or a flexible polymer film. For example, flexible polymer films include polyethylene terephthalate (PET), polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS), polymethylmethacryl Polyethylene Methacrylate (PMMA), Polyethylene Naphthalate (PEN), Polyether Sulfone (PES), Cyclic Olefin Copolymer (COC), Triacetylcellulose (TAC) Film, Polyvinyl Alcohol Polyvinyl alcohol (PVA) film, polyimide (Polyimide, PI) film, polystyrene (Polystyrene, PS) may be made of any one, which is only one example, but is not necessarily limited thereto.

The first transparent electrode layer 20 is formed on the substrate 10 to form a transparent conductive substrate. The first transparent electrode layer 20 includes a transparent conductive material through which electricity can flow without disturbing the transmission of light. can do. The transparent conductive material may be, for example, indium tin oxide (ITO), fluorine tin oxide (FTO), indium zinc oxide (IZO), copper oxide, zinc oxide, titanium oxide, or the like. It may include a metal oxide of.

In addition, the transparent conductive material may include nanowire composites such as nanowires, photosensitive nanowire films, carbon nanotubes (CNTs), graphenes, or mixtures thereof. Here, it is possible to control the color and reflectance while ensuring the electrical conductivity through the control of the content of the nano-powder.

In another example, the transparent conductive material is chromium (Cr), nickel (Ni), copper (Cu), aluminum (Al), silver (Ag), molybdenum (Mo), gold (Au), titanium (Ti) and alloys thereof It may also include at least one of.

The first transparent electrode layer 20 is stacked on the entire surface of the substrate 10 and then a predetermined region is etched by a physical or chemical method so that the first transparent electrode layer 20 is formed and the first transparent electrode layer 20. It is separated into regions which are not formed by etching.

Accordingly, a first color change material layer 30 selected from one of an oxide material or a reducing material is formed on the region where the first transparent electrode layer 20 is formed, wherein the first color change material layer 30 is first transparent. Instead of being formed in the entire area of the electrode layer 20, the stack is stacked only on a predetermined area to form the bus electrode layer 70 to be described later.

The first color change material layer 30 is formed by coating any one of an oxide material or a reducing material on a region to be stacked, and drying and performing high temperature baking, and an electrolyte layer on the first color change material layer 30. 40 and the second color change material layer 50 are sequentially formed, respectively.

In addition, the first color change material layer 30, the second color change material layer 50, and the electrolyte layer 40 reversibly change color due to voltage application from the outside using an electrochromic principle that changes color when a voltage is applied. Or an element whose transmittance varies.

The total thickness of the first color change material layer 30, the second color change material layer 50, and the electrolyte layer 40 may be 10 to 500 μm, preferably 20 to 300 μm, and more preferably 50 to 200 μm. have. When the total thickness of the first color change material layer 30, the second color change material layer 50 and the electrolyte layer 40 is less than 10㎛, the contact between the first transparent electrode layer 20 and the second transparent electrode layer 60 If the total thickness of the first color change material layer 30, the second color change material layer 50 and the electrolyte layer 40 is more than 500㎛, the electrical conductivity is reduced to the reaction rate Can be slow.

The first color change material layer 30 and the second color change material layer 50 may include a material having excellent discoloration or discoloration performance, excellent response speed, durability, and a memory effect. For example, the first color change material layer 30 may be made of an oxidizing material for oxidation, and the second color change material layer 50 may be made of a reducing material for reducing.

Of course, the first color change material layer 30 may be made of a reducing material and the second color change material layer 50 may be made of an oxide material.

The first color change material layer 30 and the second color change material layer 50 may include at least one of an organic color change material and an inorganic color change material. In the present specification, the color change material refers to a material having an electrochromic property that the light absorption is changed by the electrochemical oxidation, reduction, electrochemical oxidation of the electrochromic material reversibly depending on whether the voltage is applied and the voltage intensity , A reduction phenomenon occurs, whereby the transparency and absorbance of the color change material may be reversibly changed. The organic discoloring material may be selected from the group consisting of, for example, viologen, anthraquinone, polypyrrole and polythiophene, polyanthracene, polyfluorene, polycarbazole, polyphenylvinylene and derivatives thereof, The color change material may be selected from the group consisting of oxides of tungsten, iridium, nickel, vanadium, molybdenum, manganese, titanium, cerium and niobium, for example. Alternatively, the color change material may be Prussian blue (PB) or Prussian blue analog (PB analog).

WO3 may be a color change material included in the reduction color change layer, and NiO may be a color change material included in the oxidation color change layer.

In addition, the electrolyte layer 40 may include a gel, solid or liquid electrolyte material having high ionic conductivity, excellent temperature resistance, and excellent lamination adhesion. The electrolyte material may include, for example, poly (methyl methacrylate) resin, polycarbonate (PC) resin or acrylic resin.

In the present invention, the electrolyte layer 40 is formed through UV curing and thermosetting after coating on the first color change material layer 30 in the present invention.

Unlike the first color change material layer 30, the second color change material layer 50 stacked on the formed electrolyte layer 40 completes the formation process only after coating on the electrolyte layer 40 and drying.

The first color change material layer 30 performs a thermosetting process through high temperature baking, but the second color change material layer 50 omits the high temperature baking process to prevent destruction of the electrolyte layer 40.

Meanwhile, a second transparent electrode layer 60 is formed on the second color change material layer 50. One side of the second transparent electrode layer 60 is formed on the second color change material layer 50, and the other side is formed from one side. It extends and is formed in a region where the first transparent electrode layer 20 is not formed on the substrate.

Accordingly, the first transparent electrode layer 20 and the second transparent electrode layer 60 are separated from each other on the substrate 10 without being in contact with each other, and the first color change material layer 30, the electrolyte layer 40, and the second color change material are separated from each other. The layers 50 are faced to each other.

As such, when the second transparent electrode layer 60 is formed, the bus electrode layer 70 is formed on the first transparent electrode layer 20 and the second transparent electrode layer 60, and external power is supplied through the pair of bus electrode layers 70. As the power supply is connected, electrochromic color is generated.

According to one embodiment of the present invention through the UV curing and thermal curing of the electrolyte layer can be eliminated the problem of the conventional injection-type electrolyte layer is composed of a single transparent conductive substrate can be induced to reduce the production cost.

3 is a view showing an electrochromic device according to another embodiment of the present invention.

In the electrochromic device 100 according to the present embodiment, unlike the above-described embodiment, the first transparent electrode layer is formed into two regions by physical or chemical etching, and the first color change material layer 30 and the electrolyte layer 40 are formed. The second transparent electrode layer 60 is connected to the first transparent electrode layer 21 on which the second color change material layer 50 is not formed.

In the above-described embodiment and the present embodiment, the first transparent electrode layer 20 may be selectively formed in one place or two places according to a situation in the work process during the formation of the electrochromic device.

As described above, the present invention has been described with reference to one embodiment shown in the drawings, but this is merely an example, and those skilled in the art may realize various modifications and other equivalent embodiments therefrom. Will understand.

Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

10: substrate 20, 21: first transparent electrode layer
30: first color change material layer 40: electrolyte layer
50: second color change material layer 60: second transparent electrode layer
70: bus electrode layer 100: electrochromic device

Claims (4)

A transparent conductive substrate having two first transparent electrode layers 20 and 21 separated from one side by etching on the substrate 10;
A first color change material layer 30 including a first color change material stacked on any one first transparent electrode layer 20;
An electrolyte layer 40 disposed on the first color change material layer 30;
A second color change material layer 50 disposed on the electrolyte layer 40 and including a second color change material;
A second transparent electrode layer 60 having one side disposed on the second color change material layer 50 and the other side formed on the other first transparent electrode layer 21, wherein one side and the other side are connected to each other; And
And a bus electrode layer 70 disposed on the first transparent electrode layer 20 and the second transparent electrode layer 60 to supply power from the outside.
The first color change material layer 30 is made of any one of an oxide material or a reducing material, the second color change material layer 50 is made of any one other than the first color change material layer 30 of the oxide material or reducing material. The first color change material layer 30 and the second color change material layer 50 are coated on the first transparent electrode layer 20 and the electrolyte layer 40 and dried, respectively, and the first color change material layer 30. Electrochromic device having a single transparent conductive substrate, characterized in that the high temperature baking after drying.
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