JPS6141109B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electroluminescent device that emits light by applying an electric field to a phosphor layer.

The purpose is to provide an electroluminescent element that is stable against humidity contained in outside air and has good brightness life characteristics.

Conventionally, the phenomenon of light emission caused by applying an electric field to a fluorescent material is known as electroluminescence (hereinafter referred to as EL).
A method has been used in which a polyamide resin film and a light emitter are sandwiched between a barely permeable film, and the four ends of the poorly permeable film are sealed by hot melting to reduce the influence of outside air.

However, the conventional EL has the drawback that the brightness of the light emitter progresses due to moisture that passes through the low moisture permeability film and enters the gap between the light emitter and the low moisture permeability film. was.

Therefore, in order to solve the above-mentioned drawbacks, a method of adhering a water-absorbing film onto the light emitting body using an adhesive and then covering it with a non-permeable film was considered, but as mentioned above, the adhesive This method has a disadvantage in that it requires a process for adhering a water-absorbing film coated with an agent to a light emitting body.

The present invention provides a solution to the above-mentioned drawbacks and will be explained in detail below using examples.

[Example 1] FIG. 1 is a cross-sectional side view of a main part of an AC electroluminescent device showing Example 1 of the present invention, in which 1 is a transparent insulating plate made of, for example, a glass substrate or a plastic film, and 2 is an area of, for example, Resistance is less than several KΩ/mouth
3 is a transparent electrode made of a thin film of metal oxide such as InO ₃ or SnO ₂ , a thin film of metal such as gold palladium, or aluminum foil with a mesh hole. A counter electrode consisting of a thin film of metal such as aluminum or copper dispersed in an inorganic binder, and 4 a luminescent material, for example, made of ZnS with an activator such as Ou or Mn and an activator such as Ci or Se. The phosphor powder is dispersed in an organic polymer binder, or a thin phosphor film is formed by a vapor deposition method, a sputtering method, an ion blating method, or the like. 5 is an insulating layer in which high dielectric constant powder such as TiO ₂ or BaTiO ₃ is dispersed in an organic polymer binder, or the above high dielectric constant powder or
It is formed using Y ₂ O ₃ by vapor deposition, sputtering, or the like. 6 is, for example, nylon 6, nylon 66
A water-absorbing film consisting of the above-mentioned film 6, with trifluorochloroethylene 7 and polyethylene 8 laminated and bonded to the front side of the film 6. A moisture-proof protective film with an adhesive layer is formed by the three layers.

The production of EL with the above-mentioned configuration requires transparent electrode 2
A transparent insulating plate 1 is adhered to the upper surface using an adhesive, and a light emitter 4 made of a phosphor dispersed in an organic polymer binder is coated on the lower surface. Further, an insulating layer 5 is formed on the counter electrode 3. In this way, the light emitter 4 of the transparent electrode 2 and the insulating layer 5 on the counter electrode 3 are heat-pressed together to form an EL matrix. The base body formed as described above is cut into a predetermined size, voltage application terminals (not shown) are attached, and the film 6
The adhesive layer consisting of trifluorochloroethylene 7 and polyethylene 8 is a moisture-proof protective film, the adhesive layer is brought into contact with the base body, and the whole is heated and pressurized, or the four edges are impulse-sealed. This melt-bonds the polyethylene layer, creating a moisture-proof seal that is sufficiently airtight. Furthermore, if the heating temperature during impulse sealing is set to be higher than the melting point of the water-absorbing film 6, adhesion can be achieved even without the layer of polyethylene 8 formed on the moisture-proof protective film.

When the EL manufactured as described above is left in a high-humidity atmosphere, moisture will escape from the surface of the ethylene trifluoride 7, which is the outer covering, the adhesive part of the moisture-proof protective film, the mounting part of the voltage application terminal, etc. Invades the mother's body. The moisture that has passed through the layer of trifluorochloroethylene 7, which accounts for most of the invading moisture, is absorbed by the next layer, the water-absorbing film 6, and does not reach the luminous body 4. This makes it possible to prevent brightness deterioration due to

In order to confirm the moisture-proof protection effect of the above-mentioned example, the EL of this example and the general one of this example were used.
EL, which is obtained by removing only the water-absorbing film 6 from the EL, is heated at 90 to 95%RH, 40℃, 100V, 50Hz.
When compared through a humidity load test in an atmosphere of It was hot.

[Example 2] Figure 2 is a cross-sectional side view of the main parts of an EL showing Example 2 of the present invention. In the figure, the same components as in Figure 1 are designated by the same numbers, and 9 is a water absorption The film is made of, for example, nylon 6, and is laminated with trifluorochloroethylene 7 to form a moisture-proof protective film, and also functions as the transparent insulating plate 1 in Example 1. ing. Further, the EL of the present invention has the above-mentioned film 9.
After forming the ITO transparent electrode 2 on top, Example 1
It was made using the same manufacturing process.

[Example 3] Figure 3 is a cross-sectional side view of the main parts of EL showing Example 3 of the present invention. In the figure, the same components as in Figure 1 are designated by the same numbers, and 10 is a water-absorbing material. The film is made of, for example, nylon 6, etc., and one side is laminated with trifluorochloroethylene 7 to form a moisture-proof protective film, and the other side is made of metal foil or the like. The counter electrode 3 is laminated and bonded to the counter electrode 3 formed thereon.

As shown in each of the above-mentioned embodiments, according to the present invention, the polyethylene chloride trifluoride layer, which is difficult to permeate, and the hygroscopic film layer are laminated and bonded, so that the polyethylene chloride trifluoride layer is not permeable. The moisture is absorbed by the next layer, a hygroscopic film layer, and does not reach the light emitting body, making it possible to prevent the brightness of the EL from deteriorating due to moisture.

In addition, since the moisture-proof protective film with adhesive layer is equipped with a polyethylene film laminated and bonded, it requires a complicated process of applying another adhesive or distributing the adhesive at the time of sealing. I don't.

In addition, the moisture-proof protective film is continuously laminated using a known method, for example, in the form of a roll.
Since it can then be cut into a predetermined shape, processing is easy and processing costs can be reduced.
Furthermore, it is possible to obtain a moisture-proof protective film with a polyethylene film that functions as an adhesive member and has an arbitrary shape.

Furthermore, since the moisture-proof protective film is flexible, if the EL matrix is flexible, a flexible finished EL product can be obtained.

In addition, by forming a transparent electrode made of metal or metal oxide on the water-absorbing film of the moisture-proof protective film, the moisture-proof protective film functions as a transparent insulating plate, making it possible to eliminate the transparent insulating plate. It is possible to reduce costs, and also to have a strong structure in close contact with the moisture-proof protective film.

Further, by laminating and adhering a metal foil on the water-absorbing film of the moisture-proof protective film and using the metal foil as a counter electrode, the metal foil can be reinforced with the moisture-proof protective film, and the counter electrode can be formed. Since the moisture-proof protective film can be laminated and bonded continuously, for example in the form of a roll, by a known method and then cut into a predetermined shape, the process can be done rationally and at low processing cost.

Note that each embodiment may be implemented alone or in combination. Furthermore, although nylon 6 was used as the water-absorbing film in the above embodiments, it is of course possible to use highly water-absorbing films such as cellophane, cellulose acetate, and polyvinyl alcohol.

[Brief explanation of the drawing]

1 to 3 are sectional side views of essential parts of an electroluminescent device showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Transparent insulating plate, 2... Transparent electrode, 3... Counter electrode, 4... Luminous body, 5... Insulating layer, 6, 9, 10... Water-absorbing film, 7... Trifluorochloroethylene, 8
…polyethylene.

Claims (1)

[Scope of Claims] 1. An electroluminescent device having a structure in which a phosphor or a phosphor layer and an insulating layer are sandwiched between a transparent electrode and a counter electrode, in which a film of polytrifluorochloroethylene and a water-absorbing element are provided. The moisture-proof protective film is formed by laminating and adhering a polyethylene film on the water-absorbing film, and the adhesive layer has a three-layer structure, which is formed by laminating and adhering a polyethylene film on the water-absorbing film, and the adhesive layer is sealed by the moisture-proof protective film. Electroluminescent device. 2. The electroluminescent device described above, wherein a transparent electrode made of metal or metal oxide is formed on the water-absorbing film of the moisture-proof protective film. 3. The above electroluminescent device, characterized in that a metal foil is laminated and adhered onto the water-absorbing film of the moisture-proof protective film, and the metal foil is used as a counter electrode.