KR910005116B1 - El element - Google Patents

Abstract

In the preparation of electroluminescence bydrophilic resin layers (2,12) and hydrophobic resin layers (1,11) are formed in the same pattern on the upper and lower parts of the element. Between hydrophilic resin layers (2,12) aluminium foil (6), dielectric layer (5), light emitting phosphor layer (4), and transparent electrode (3) are laminated successively. The composition (4) is prepared by adding 1-10 wt.% polyvinyl butyral resin and 0.1-5 wt.% Si coupling agent to the major component, cyanoethyl cellulose resin (E= 12-20).

Description

EL

The accompanying drawings are cross-sectional views showing the laminated structure of the EL device.

* Explanation of symbols for main parts of the drawings

1, 11: hydrophobic resin 2,12: hydrophilic resin

3: transparent electrode 4: phosphor

5: dielectric layer 6: aluminum foil

7: electroluminescent element

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electroluminescent device, and in particular, an electric field in which a specific material is added to a cyanoethylcellulose-based resin (Resin), which is an organic material constituting a phosphor in a stacked structure of the electroluminescent device, at a specific composition ratio. It relates to a light emitting device.

In general, an EL device emits light by applying an electric field to a material, and its structure is as follows.

That is, in the electroluminescent device, the bottom layer is made of hydrophobic resin (Hydro Phobic Resin), and a hydrophilic resin (Hydro Philic Resin) is formed thereon, and an aluminum foil (Al foil) and Dielectric layer, phosphor (Light Emitting Phosphor Layer) and transparent electrode (Transparent Electrode) is a laminated structure sequentially, and again forming a hydrophilic resin on the transparent electrode and then the top layer is the same as the bottom layer To form a hydrophobic resin.

When the powder phosphor specially treated in this structure is sandwiched between the transparent electrode and the Al foil, when a voltage is applied to the two electrodes, the light emitting action is performed by the action between the electron and the phosphor. In the light emitting device, the phosphor is composed of an organic material, and the organic material functions as a phosphor holder and a full-length polarization. In order to apply a large voltage to the phosphor, the dielectric constant of the organic material must be large.

Organic materials satisfying these characteristics include epoxy resin (ε = 7-8: ε means dielectric constant) and cyano ethyl cellulose resin (ε = 12-20). As an organic substance, a cyanoethyl cellulose resin having a relatively high dielectric constant was used as compared with the epoxy resin.

However, when a single component cyanoethyl cellulose-based resin is used as the organic substance of the phosphor, there is a problem of poor workability due to poor plasticity and poor adhesion.

In order to solve such a problem, the present invention provides a polyvinyl butyral resin having a good plasticity and adhesion to a single component cyanoethyl cellulose-based resin that is used as an organic material of a phosphor in an electroluminescent device. ) And an Si (silicon) -based coupling agent (Coupling Agent) by forming an organic material to obtain an electroluminescent device having a phosphor with improved plasticity and adhesion.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

That is, in the electroluminescent device 7 in which the hydrophobic resins 1, 11 and the hydrophilic resins 2, 12 are formed in the same pattern in the upper and lower layers, respectively, as shown in FIG. Located between the transparent electrode 3 and the dielectric layer 5, the fluorescent material (4) that emits light by the action of electrons when a voltage is applied to the transparent electrode (3) and Al foil (6) 1-10 wt% of polyvinyl butyral resin in a single component cyanoethyl cellulose resin (ε = 12-20), which is an organic material constituting the phosphor 4). ) And 0.1-5wt% of Si (silicone) -based coupling agent (Coupling Agent) is added to constitute an electroluminescent device using a new material as the organic material of the phosphor.

The effects of the present invention constituted as described above are improved plasticity by adding polyvinyl butyral resin and Si-based binder to the cyanoethyl cellulose-based resin of a single component to improve the thickness control ability, adhesion to the transparent electrode Due to the improvement, the manufacturing workability of the EL device is improved, and the organic material of the light emitting layer maintains the characteristics of the cellulose-based resin, so that the dielectric constant is increased, thereby improving the light emission characteristics.

Claims (2)

A hydrophobic resin and a hydrophilic resin are formed in the same pattern on the upper layer and the lower layer, and the Al foil 6 and the dielectric 5, the phosphor 4, and the transparent electrode 3 are disposed between the upper and lower hydrophilic resins 2 and 12. In a device having a stacked structure of), polyvinyl butyral and Si-based binder are added to a single component cyanoethylcellulose-based resin (ε = 12-20), which is an organic substance constituting the phosphor 4. An electroluminescent device, characterized in that added at a constant composition ratio. According to claim 1, wherein the composition of the polyvinyl butyral added to the single-component cyanoethyl cellulose-based resin (n = 12-20) is 1-10wt%, the composition of the Si-based binder is 0.1-5wt% An electroluminescent element, characterized in that.

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