JPH0298091A - Electroluminescent device - Google Patents

Abstract

PURPOSE:To make an electroluminescent device emit various color luminescence and make it a thin-type and at the same time to attain high humidity resistance and long life with low cost by layering a transparent electrode, a luminescent layer, an insulating layer, and back plate on a transparent and colored glass substrate and sealing the outside with a metal film. CONSTITUTION:As a top packaging film, a transparent glass substrate 1 is used and a transparent electrode 2, a luminescent layer 3, an insulating layer 4, and a back plate 5 are successively formed in the inside of the substrate. As a bottom packaging film, a plastic film 6a whose outside is coated with a metal film 6 such as aluminum by evaporation or a metal film such as an aluminum foil whose inside is treated for insulation is used. By this, reliability of humidity resistance is elevated and water-capturing film or costly water proofing film become unnecessary and a thin-type electroluminescent device is manufactured at low cost. Various composite light colors are obtained by combination of the color of the luminescence of the luminescent layer and the color of the glass substrate 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an electroluminescent device that emits light by an electric field.

[Prior Art] As shown in Figure 2, a conventional electroluminescent device has a structure in which a transparent electrode formed on a transparent electrode base film a contains zinc sulfide and an activating agent such as copper or chlorine. A light-emitting layer C is formed using the luminescent particles obtained using an organic binder (such as ethyl cyanocellulose), and a back electrode e is formed on the other surface of the light-emitting layer C via an insulating layer d such as barium titanate. There is. This is sandwiched between water-catching films f9g, the outside of which are sandwiched between moisture-proof films h and i made of polychlorinated trifluoroethylene, which constitute the top and bottom package films, and the outer peripheries of both moisture-proof films are coated with hot-melt adhesive. It is heat-pressed and sealed.

[Problems to be Solved] Since the light-emitting layer deteriorates even with a small amount of moisture, it is packaged with moisture-proof films h and i. However, the moisture-proofing properties of the moisture-proof film are not perfect, and a small amount of moisture can enter. Therefore, in order to capture the small amount of moisture that has passed through this moisture-proof film, water-catching films f and g are arranged to improve moisture resistance. Although the thickness from the transparent electrode to the back electrode e is only about 0.2+am, if you add the thickness of the water-trapping film f7g, the total thickness becomes about 1 mm or more, making it even thinner than this. It was impossible.

Furthermore, since the moisture-proof film is expensive, there has been a problem in that the cost is high.

Furthermore, the luminescent color of the luminescent layer is determined by the activating agent such as copper and chlorine, but it can be blue, orange, green, pink,
It was limited to only five colors, including white.

Therefore, the purpose of the present invention is to make an electroluminescent element thinner so that it can be used for watch hands, etc., increase the reliability of moisture proofing, extend the lifespan, and reduce the price. There is a particular thing.

Still another object of the present invention is to obtain an electroluminescent device that can emit light in various colors.

[Means for Solving the Problems] In order to achieve the above object, the electroluminescent element of the present invention has a transparent electrode 1 on the inner surface of a transparent glass substrate.
A light emitting layer, an insulating layer, and a back electrode are laminated in this order, and the outside of the back electrode is sealed with a metal film.

As the metal film, in addition to metal foil, a plastic film on which a metal vapor-deposited film is formed can be used.

Further, as the glass substrate, a colored glass substrate is used in order to obtain a composite color with the luminescent color of the electroluminescent element itself.

[Example] An embodiment of the present invention will be described based on the drawings.

As shown in FIG. 1, a transparent glass substrate 1 is used as the top package film, and transparent electrodes 2 are formed on the inner surface of the glass substrate 1.
is formed. On this transparent electrode 2, a light-emitting layer 3. The insulating layer 4 and the back electrode 5 are sequentially laminated. The metal film 6 is used as a bottom package film that seals from the transparent electrode 2 to the back electrode 5 described above.

This is constructed by forming a metal vapor deposition film 6 such as aluminum on the outer surface of a plastic film 6a.
It is designed to prevent moisture from entering.

The plastic film 6a is made of polyethylene terephthalate or the like, and a hot melt adhesive 7 is applied to the inner surface of the plastic film 6a.
are formed, and are adhered to the glass substrate 1 facing each other and sealed.

Note that the metal vapor deposition film 6 may be formed on the inner surface of the plastic film 6a, and in that case, it is necessary to insulate the inner surface of the metal vapor deposition film 6.

Further, the metal film is made of aluminum foil, for example,
Direct sealing may be performed without using a plastic film. It is necessary to insulate the inner surface of the aluminum foil, and then hot-melt adhesive is formed thereon and the back electrode 5 is bonded from the outside to face the back electrode 5 for sealing.

Furthermore, by using a colored translucent glass substrate as the glass substrate 1, many synthetic colors can be obtained by matching the emitted light color of the light emitting layer 3 itself.

With such a structure, the light emitting layer 3 emits light in response to an electric field applied via the transparent electrode 2 and the back electrode 5, and the light is reflected by the insulating layer 4 and transmitted through the glass substrate 1. and emits light.

If the glass substrate 1 is colored, for example, red colored glass, and the luminescent layer 3 emits light in blue, for example, the electroluminescent element will appear purple.

[Effects] The electroluminescent device of the present invention having the above configuration eliminates the need for two water-trapping films and a transparent electrode base film as in the past, so it can be made thinner, making it suitable for use in watch hands, etc. It is also possible to use Furthermore, since it is sealed with a glass substrate and a metal film, reliability of moisture proofing is increased and a long life can be achieved. Furthermore, since there is no need to use an expensive moisture-proof film, the cost can be reduced.

Furthermore, in the present invention, it is possible to provide an electroluminescent element that emits light in various colors due to its simple configuration without causing an increase in cost.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG. 2 is a sectional view showing a conventional example. 1. Glass substrate, 2. Transparent electrode, 3. Light emitting layer, 4 Insulating layer, 5. Back electrode, 6. Metal film (metal deposited film), 6a Plastic film. that's all

Claims (3)

[Claims] (1) On the inner surface of a transparent glass substrate, a transparent electrode, a light emitting layer,
An electroluminescent device characterized in that an insulating layer and a back electrode are sequentially laminated, and the outside of the back electrode is sealed with a metal film. (2) An electroluminescent device, wherein the metal film according to claim 1 is a metal vapor-deposited film formed on a plastic film. (3) An electroluminescent device, wherein the glass substrate according to claim 1 is a colored glass substrate.