JPS5914876B2 - Method of manufacturing an electroluminescent lamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing an electroluminescent lamp, and more particularly to an improved method of manufacturing an electroluminescent lamp having an organic dielectric layer.

The conventional manufacturing method for electroluminescent lamps is to place a dielectric layer on a substrate electrode,
It is common to sequentially laminate a phosphor layer and a transparent electrode layer, and among these, transfer is widely used to form the dielectric layer and the phosphor layer.

However, when the single-force electrode serves as the center electrode and the light-emitting surface side of the five electroluminescent lamps is formed on the full-direction side, the formation of each laminate is greatly restricted. For example, if the center electrode is a metal rod or cylindrical body and a light emitting surface is to be provided in all directions around its outer periphery, it is not possible to directly transfer the phosphor layer etc. to the center electrode material and use other techniques. "o There is no other choice but to use the dipping method. However, using the same coating technique to laminate the dielectric layer and the phosphor layer makes the work process extremely complicated and makes it extremely difficult to control the film thickness. For example: In the case of the dipping method, time is required for drying or curing after dipping.In addition, regulating the film thickness of the fluorescent layer is complicated and difficult with various coating techniques due to adjustment of processing conditions, etc. Therefore, the present invention has been proposed in view of the above, and is an electroluminescent device that has a center electrode and forms light-emitting surfaces in multiple directions. The object of the present invention is to present an improved manufacturing and processing method for lamps.

According to the present invention, an electroluminescent lamp is disclosed in which a dielectric layer and a phosphor layer are laminated on the outwardly facing surface of a conductor serving as a center electrode, and the formation of the lamination is performed using the immersion method and the spray method. By adopting a combination process, it was possible to simplify the manufacturing process and make it easier to regulate the film thickness.

Specifically, in the first step, a metal rod or a cylindrical conductor is used as the center electrode, and a high dielectric layer is deposited on the outer peripheral surface by dipping, and then in the second step, A bright phosphor layer is spray deposited. In the first step of dip deposition, the conductor of the center electrode is immersed in a solution containing a high dielectric material with good electrical insulation and adhesive properties, such as epoxy resin, and the thickness is adjusted by adjusting the concentration of the solution. A high dielectric layer in the range of 10 to 50 μm is deposited. The thickness depends on electrical properties such as dielectric constant, but if it is less than 10 μm, sufficient adhesion function will not be obtained for the formation of the next phosphor layer, and if it exceeds 50 Itm, the electroluminescent lamp will not work properly. It greatly reduces the luminescence characteristics and becomes impractical.

Therefore, the thickness of the coating layer should be limited to within the range of 10 to 50 μm. First, the second step, spray deposition, is performed by spraying pre-selected phosphor particles for electroluminescent lamps while the high dielectric layer is in an undried or uncured state and has a sticky surface. Spray it to adhere to the adhesive surface of the high dielectric layer. In this case, since only a single layer of the phosphor layer corresponding to approximately the maximum particle size adheres, a substantially uniform phosphor layer can be obtained by brushing off the overlapping phosphor particles. That is, a phosphor layer having a desired thickness and uniformity can be easily obtained by controlling the particles of the phosphor. The laminated structure of the high dielectric layer and the phosphor layer obtained in this way is then formed with a transparent electrode, connected to the lead-out lead, and then sealed with a moisture-proof resin outer skin to complete the electroluminescent lamp. be done.

For example, after a transparent conductive film layer is dried or hardened, it is formed by vapor deposition on a phosphor layer, a current collection band such as silver paste is applied to this vapor-deposited transparent conductive film to form a transparent electrode, and then a normal A lead-out lead is provided using a method and a moisture-proof outer cover is sealed. The feature of the above-mentioned manufacturing method of the present invention lies in the lamination method of the dielectric and phosphor in the first and second steps, in which the phosphor layer is spray deposited on the unfinished state of the dielectric layer. As a result, the manufacturing process can be shortened and simplified, and the thickness of the phosphor layer can be easily and reliably controlled. Although the center electrode is also applied to double-sided electroluminescent lamps in which the conductor is a flat plate, the manufacturing force method of the present invention is suitable only when a light-emitting surface is provided in each direction of the outer periphery as the center electrode. It is.
Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 3 are sectional views showing the manufacturing process and completed state of the electroluminescent lamp according to the present invention, and FIG. 4 shows the process diagram. Figures 1 to 1. 3, the electroluminescent lamp of the present invention has a conductor 1 of the center electrode, a polymer high dielectric layer 2, a phosphor layer 3, and a transparent conductive film 4 laminated in this order, and a current collector 5 and each lead-out layer are laminated in this order. It is constructed by pulling out leads 6 and 7 and sealing a moisture-proof resin outer cover 8, and represents a so-called organic electroluminescent lamp. As shown in FIG. 4, the manufacturing process of this electroluminescent lamp includes a dielectric dipping step 11 in which a high dielectric material is coated on the center electrode, and a phosphor spraying step 11 in which a phosphor is coated on the high dielectric layer. The method includes a deposition step 12, a step 13 for forming a conductive film, which is a transparent electrode, on the phosphor layer, and a moisture-proof outer sealing step 14 for sealing the entire structure against moisture. Here, the manufacturing process that characterizes the present invention is the first step of dielectric dipping step 11 and the second step of phosphor spraying step 12. First, the first step is to form an undried or uncured layer 10 of the high dielectric layer of the conductor 1 of the center electrode shown in FIG. A metal rod is used, and a high dielectric layer made of epoxy resin in which BaTiO3 (titanium barium) high dielectric fine powder is dispersed is used.

Note that the conductor 1 may be a metal plate or a metal cylinder, and it goes without saying that the high dielectric layer is made of a polymer high dielectric material with good electrical insulation and adhesive properties. In this first step, the conductor 1 is immersed in a high dielectric epoxy resin solution, leaving the upper terminal, to form a dip coating film on substantially the entire surface. Here, the concentration and viscosity of the epoxy resin solution are adjusted so that the thickness of the dip coating film is within 10 ILm to 50 .mu.m, and a high dielectric layer is obtained that provides appropriate adhesive strength and appropriate electrical properties. Next, phosphor particles are suspended in the air on the uncured layer 10 having an adhesive surface formed in the first step using a spray nozzle 10 as shown in FIG. A second step of deposition is performed.

This second step, which is the phosphor spray deposition step 12, is carried out immediately after the first step, which is advantageous in shortening the processing time and also simplifies the process. In particular, spray deposition of the phosphor is carried out while rotating the center electrode to improve deposition efficiency. Further, the deposited phosphor particles are removed except for a single layer having approximately the largest particle size, and the phosphor particles overlapping the single layer and resulting in non-uniform thickness are removed by air jetting or the like. Therefore, the phosphor layer is obtained substantially uniformly as shown in FIG. After passing through the first and second steps described above, the uncured high dielectric layer 9 shown in FIG. 1 becomes the hardened high dielectric layer 2 as shown in FIG. 2.

Then, a transparent conductive film 4 is deposited, a current collector 5 is provided, and a transparent electrode is formed. Thereafter, as shown in FIG. 3, lead-out leads 6 and 7 are connected to each electrode, and a moisture-proof resin outer skin 8 is sealed by heat prene processing to complete the electroluminescent lamp. The invention thus presents a simplified and improved manufacturing method suitable for an electroluminescent lamp with a central electrode and a light-emitting surface facing the external force.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view showing the main manufacturing process of an electroluminescent lamp according to the present invention, FIG. 2 is a cross-sectional view of the process following FIG. 1, and FIG. Cross-sectional view when completed,
4 are process diagrams for manufacturing the electroluminescent lamp shown in FIG. 3. DESCRIPTION OF SYMBOLS 1... Center electrode conductor, 2... High dielectric layer, 3... Phosphor layer, 4... Transparent conductive film, 5... ... Current collector, 6, 7 ... Derivation lead, 8 ... Moisture-proof outer skin, 9 ... Undried or uncured layer.

Claims (1)

[Claims] 1. The conductor of the center electrode is immersed in a solution containing a high dielectric material with good electrical insulation and adhesive properties, and the outer surface is coated with a thickness of 1.
A process of depositing a high dielectric layer in the range of 0 to 50 μm, and attaching phosphor particles to the undried or uncured adhesive surface of this high dielectric layer to form a single layer with a substantially uniform thickness. a step of depositing a phosphor layer, a step of depositing a transparent conductive film and a current collector on the phosphor layer to form a transparent electrode after drying or curing the high dielectric layer, and a step of forming a transparent electrode on the phosphor layer; and a step of forming a transparent electrode on the phosphor layer. and a step of connecting a lead-out lead to the dielectric electrode and sealing a moisture-proof resin outer cover. 2. The conductor of the center electrode is made of a metal rod or a cylindrical metal plate, and the phosphor layer is sprayed and deposited on the outer surface of the conductor while rotating the conductor with the high dielectric layer coated thereon. A method for manufacturing an electroluminescent lamp according to claim 1, characterized in that: