JPS58165291A - Electric field light emitting lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flexible electroluminescent lamp, and more particularly to an electroluminescent element in which an electrode body and a light emitting layer are bonded together by thermocompression, with an adhesion promoter layer interposed between them.

Generally, a flexible electroluminescent lamp consists of a pair of flat electrode bodies 1.2, at least one of which is transparent, as shown in FIG.
An electroluminescent element 6 with a luminescent layer 5 made of a phosphor layer 8 and an insulator layer 4 interposed therebetween is moisture-proofed from both sides, leaving a part of the electrode lead 7.8 connected to both electrode bodies 1.2. The device is coated with a resin outer skin 9 having good properties, and the resin outer skin 9 on the periphery of the element 5 is sealed.Since it is sheet-like and has flexibility, it can be used for display devices of various shapes, liquid crystal backlights, etc. It is used.

In such a sheet-like flexible electroluminescent lamp, the electroluminescent element 6 generally has a phosphor layer 3 or an insulator layer 4 between a pair of flat electrode bodies 1 and 2, as shown in the figure. It has an interposed laminated structure, and one electrode body 2, for example, has an insulating layer 4 in which high dielectric fine particles are dispersed in a high dielectric constant organic binder made of a thermoplastic resin material, or an insulating layer 4 made of a thermoplastic resin material. A phosphor layer 3 in which phosphor powder is dispersed in an organic binder having a high dielectric constant is sequentially laminated using a screen printing method or the like.
It is obtained by placing a transparent conductive film, which will become the other electrode body 1, on top of this and thermo-compression bonding from both sides with a hot press machine or a heating roller, and the luminescent layer 5 and electrode body 1 are bonded by thermo-compression bonding. It can be bonded and is suitable for mass production.

Incidentally, the thermocompression bonding between the luminescent layer 5 and the electrode body 1 is usually carried out by thermocompression bonding using a heated press machine or heated roller heated to a temperature higher than the plasticizing temperature of the organic binder of the luminescent layer 5. Since the electrode body 1 is a metal body with a flat surface, it is difficult to obtain sufficient adhesive strength, resulting in problems such as peeling or partial failure to adhere. This has caused problems such as uneven brightness on the light emitting surface and peeling of electrodes during device manufacturing.

For this reason, in the past, adhesive strength was somehow achieved by repeating thermocompression bonding multiple times or by increasing heating temperature and performing re-thermocompression bonding, but this not only made the work complicated, but also increased the heating temperature. There were no effective solutions such as the transparent conductive film being heat-shrinked and deformed, or the firefly powder inside the 1-luminescent layer 5 deteriorating resulting in a decrease in brightness. One aspect of the present invention has been proposed as described above, in which the luminescent layer 5 and the electrode body 1 can be bonded together without increasing the bonding temperature or reheating and bonding.
It is an object of the present invention to provide an electroluminescent lamp that can provide strong adhesion to the substrate.

The electroluminescent lamp according to the present invention is one in which a pair of flat electrode bodies are interposed with a luminescent layer made of a thermoplastic resin organic binder and a fluorescent powder dispersed therein, and the luminescent layer and the luminescent layer are bonded together by thermocompression. It is characterized by an adhesion aid layer of a silane coupling agent interposed between the electrode body and the organic binder of the light emitting layer and the metal of the electrode body, which are strongly bonded by the chemical covalent bond of the silane coupling agent. is what was obtained. This silane strength/twisting agent is generally X~--5i (OR).

It is represented by the structural formula, where X is a functional group that reacts with organic substances (amino group 1, vinyl group, epoxy group, etc.), and R is a hydrolyzable group (methoxy group, ethoxy group, etc.), which are different within the same molecule. It has two types of functional groups and acts as a barrier between organic and inorganic substances, and for example, aminosilanes can be used.

, 1.・ One embodiment of the present invention will be described in detail below.

FIG. 2 shows a cross-sectional view of a flexible electroluminescent lamp according to the invention. . That is, the light emitting element 11 of this electroluminescent lamp is
Similar to FIG. 1, it has a normal structure in which a phosphor layer 3 and a light emitting layer 5 of an insulator layer 4 are laminated between a pair of flat electrodes 1.2.
The difference from FIG. 1 is that an adhesion aid layer 12 of a silane coupling agent is interposed between the phosphor layer 3 and the electrode body 1 which are bonded by thermocompression. Note that the same functional parts as in FIG. 1 are indicated by the same symbols and their explanations will be omitted. This adhesion aid layer 12 uses a silane coupling agent such as aminosilane, and is applied in the form of a uniform thin film to the adhesive surface of the electrode body 1 with the phosphor layer 3.

Next, a method for manufacturing a flexible electroluminescent lamp having the above structure will be described.

First, an A4 foil is used for one electrode 2, and on this At foil, an insulating layer 4 in which high dielectric fine particles are dispersed in a high dielectric constant organic binder made of a thermoplastic resin material, and also a high dielectric layer 4 are formed. The phosphor layer 5 is formed by sequentially laminating phosphor layers 8 in which phosphor powder is dispersed in an organic binder of a certain amount (see FIG. 8). To form the luminescent layer 5, first, a known thermoplastic resin material having a high dielectric constant, such as cyanoethyl cellulone or cyanoethyl sucrose, is used as an organic binder having a high dielectric constant, and barium titanate is added to each of these. Predetermined amounts of high dielectric fine particles and zinc sulfide phosphor powder are mixed and suspended in an organic solvent to create a coating solution, and these coating solutions are sequentially printed into a uniform thin film using a screen printing method. All you have to do is laminate them.

Next, the other electrode 1 is a transparent conductive film in which a transparent conductive layer 1b of indium oxide or the like is adhered to a polyester resin film 1a, for example, and a silane coupling agent is coated in a thin film on the conductive layer 1b of this film 1. The above-mentioned aminosilanes that are compatible with the organic binder used for the luminescent layer 5 are used as the 6-silane cassoplating agent to form the adhesion aid layer 12 (see FIG. 4), and the D-Nobu method or It is applied in the form of a thin film of several λ by the spraying method. Next, the transparent conductive film 1 with the adhesion promoter layer 12 formed thereon is attached to the luminescent layer 5.
Heating roller 18 placed on the laminated electric Ifi 2 and heated to a temperature higher than the plasticizing temperature of the organic binder of the luminescent layer 5
By applying pressure from both sides (see FIG. 5), a light emitting element 11 is obtained, and by sealing this with a resin outer cover 9 in the conventional manner, a flexible electroluminescent lamp shown in FIG. 2 is obtained.

In this way, in the electroluminescent device 11 in which the luminescent layer 5 and the electrode body 1 are bonded together by thermocompression via the adhesion aid layer 12 of the silane coupling agent, the silane coupling agent is combined with the organic substance of the organic binder of the luminescent layer 5. A reaction occurs that causes a chemical covalent bond between the metallic materials of the electrode body, and strong adhesion between the two can be obtained, allowing for uniform adhesion over the entire surface of the light emitting surface, without the need for multiple thermocompression bonding or increasing the pressure bonding temperature as in the conventional method. was gotten. Further, an electroluminescent lamp using the light emitting element manufactured in this way and sealed with resin had the same brightness and longevity as the electroluminescent lamp manufactured by the conventional method. In the above embodiment, the adhesion aid layer 12 of the scene coupling agent was interposed between the transparent conductive film 1 and the phosphor layer 8;
It is clear that similar effects can be obtained by intervening between the two or both.

As described above, the present invention provides an electroluminescent lamp in which a luminescent layer in which phosphor powder is dispersed in an organic binder is interposed between a pair of electrode bodies, and the electrode body and the luminescent layer are thermocompression bonded. An adhesion aid layer of silane coupling agent is interposed between the layer and the electrode body, resulting in strong adhesion, eliminating uneven brightness on the light emitting surface and peeling of the electrode, and producing an electroluminescent lamp with excellent brightness characteristics. can be provided.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional flexible electroluminescent lamp, Fig. 2 is a sectional view of a flexible electroluminescent lamp according to the present invention, and Figs.
The figure is a sectional view showing the part in the process of being manufactured in FIG. 2.

Claims (1)

[Claims] A luminescent layer made of a fluorescent powder dispersed in an organic binder made of a thermoplastic resin material is interposed between a pair of flat electrode bodies, and the electrode body and the luminescent layer are bonded by thermocompression. An electroluminescent lamp characterized in that an adhesion aid layer of a silane coupling agent is interposed between the light emitting layers.