KR100287860B1 - Organic Electroluminescence Device and method for fabr icating the same - Google Patents

Abstract

PURPOSE: An organic electro-luminescence device is provided to improve adhesive strength between a substrate and a barrier rib or the first electrode and the barrier rib by using a predetermined adhesive layer. CONSTITUTION: An ITO(Indium Tin Oxide) is formed on an upper portion of a glass substrate(11). The first electrodes are arranged toward one direction in a predetermined interval by patterning the ITO material. An adhesive layer(13) is formed on a whole surface of the glass substrate(11) including the first electrode. The adhesive layer(13) is formed by a predetermined chemical expression. A multitude of barrier rib(14) is formed toward a vertical direction of the first electrodes in the predetermined interval on the adhesive layer(13). An organic electro-luminescence layer(15) and the second electrodes(16) are formed sequentially on the whole surface of the glass substrate(11) including the barrier ribs(14). An encapsulation layer(17) is formed thereon.

Description

Organic electroluminescent device and method for manufacturing same {Organic Electroluminescence Device and method for fabr icating the same}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly, to an organic electroluminescence device and a method of manufacturing the same.

Recently, as the size of the display device increases, the demand for a flat display device having less space occupancy is increasing. As one of the flat display devices, an electroluminescent device is attracting attention.

The electroluminescent device is largely divided into an inorganic electroluminescent device and an organic electroluminescent device according to the material used.

In general, an inorganic electroluminescent device is a device that emits light by applying a high electric field to a light emitting part, accelerating electrons in the high electric field, and colliding with the light emitting center to thereby excite the light emitting center.

In addition, the organic light emitting device is based on the exciton generated by combining electrons and holes injected by injecting electrons and holes from the electron injection electrode (cathode) and hole injection electrode (anode) into the light emitting unit, respectively. It is a device that emits light when falling into a state.

Since the inorganic electroluminescent device having the above operating principle requires a high electric field, a high voltage of 100 to 200 V is required as a driving voltage, whereas the organic electroluminescent device can be driven at a low voltage of about 5 to 20 V. There is an advantage, and research is being actively conducted.

In addition, the organic light emitting display device has excellent characteristics such as wide viewing angle, high speed response and high contrast, so it can be used as a pixel of a graphic display, a TV image display or a surface light source. They are thin, light, and have good color, making them suitable for next-generation flat panel displays.

As shown in FIG. 1, the organic light emitting diode used for this purpose is formed on the transparent substrate 1 with the first electrodes 2 in the form of a stripe, and the organic light emitting elements on the first electrodes 2. The electroluminescent layer 3 and the second electrodes 4 are formed in a band shape, and partition walls 5 are formed between the organic electroluminescent layer 3 and the second electrodes 4 of each pixel for electrical insulation between the pixels. Made of structure.

Here, the first electrode 2 and the second electrode 4 are formed in a matrix form perpendicular to each other.

However, when fabricating an organic light emitting device having such a structure, a problem is the adhesion between the layers.

Since this adhesive force is an important factor in determining the yield of the device, if the adhesion between the layers is not good, it has a fatal effect on the yield of the device.

There are many reasons for poor adhesion, but the main reason is that two different materials meet.

Therefore, the adhesive force has been improved by inserting a buffer layer between the materials that can buffer two materials having different properties.

However, in the structure of FIG. 1, the problem of adhesion between the partition 5 and the substrate 1, the partition 5 and the first electrode 2 has not been solved.

The reason is that in general, the first electrode of the organic light emitting diode uses a lot of hydrophilic indium tin oxide (ITO), and the substrate also uses a lot of hydrophilic glass (glass). This is because a hydrophobic polymer is used.

As shown in FIG. 2A, when the surface of the substrate is hydrophilic, the partition formed thereon is formed as shown in FIG. 2B so that an interface portion (provisional portion) that meets the substrate is formed to be dug inward, thereby forming a partition of a desired shape. It is not formed.

This occurs because of the poor adhesion between the barrier and the substrate.

This phenomenon also affects the layers formed on the barrier rib, so that the organic electroluminescent layer is not properly formed between the first electrode and the second electrode, so that the first electrode and the second electrode directly meet, and the desired barrier rib is formed. Since this is not formed, a short phenomenon occurs between neighboring second electrodes, and electrical insulation is not performed between pixels.

The organic light emitting device according to the prior art has the following problems.

Since the adhesive force between the substrate and the partition wall, the first electrode and the partition wall is not good, the partition wall is not properly formed and the yield of the device is reduced.

An object of the present invention is to provide an organic light emitting display device and a method of manufacturing the same, which can improve adhesion between a substrate and a partition, a first electrode, and a partition by a simple method.

1 is a view showing a general organic light emitting display device

2A shows a hydrophilic substrate surface

Figure 2b is a photo showing a partition formed on the hydrophilic substrate

3A to 3D are cross-sectional views illustrating a manufacturing process of an organic light emitting display device according to the present invention.

Explanation of symbols for main parts of the drawings

11 glass substrate 12 first electrode

13 adhesive layer 14 partition wall

15 organic electroluminescent layer 16 second electrode

17: encapsulation layer

The main feature of the organic light emitting display device and the method of manufacturing the same according to the present invention is to surface-treat the substrate on which the first electrode is formed with a material having at least one functional group reacting with a hydrophilic functional group and having at least one hydrophobic functional group.

According to another aspect of the present invention, in an organic light emitting display device having a plurality of pixels including a first electrode, an organic light emitting layer, and a second electrode, a substrate, a partition wall formed on the substrate and the first electrode for electrical insulation between pixels, And an adhesive layer formed between the substrate and the partition wall, the first electrode and the partition wall, and having a hydrophobic functional group.

Another feature of the present invention is a substrate, a plurality of first electrodes formed with a predetermined distance in one direction on the substrate, an adhesive layer made of a material having a hydrophobic functional group formed on the front surface of the substrate including the first electrodes, and on the adhesive layer A plurality of partition walls formed at a predetermined interval in a direction perpendicular to the first electrode, an organic electroluminescent layer formed on an adhesive layer on both sides of the partition wall, a second electrode formed on the organic electroluminescent layer, and a front surface including the second electrode It is composed of an encapsulation layer formed on.

Another feature of the present invention is a glass substrate, a plurality of first electrodes formed of ITO (Indium Tin Oxide) formed at regular intervals on the glass substrate, and formed on the front surface of the substrate including the first electrodes. And the following Chemical Formula 1, Chemical Formula 2, Chemical Formula 3:

(Wherein R is a substance selected from alkyl, amine,

R ₁ , R ₂ , R ₃ , R ₄ , R ₅ , R ₆ is a substance selected from H group, alkyl group,

R ₁ , R ₂ , R ₃ , R ₄ , R ₅ , R ₆ are all the same or not the same,

X ₁ , X ₂ , X ₃ , X ₄ is a substance selected from halogen group, methoxy group, ethoxy group,

X ₁ , X ₂ , X ₃ , X ₄ are all the same or not the same)

An adhesive layer made of a material having any one of chemical formulas, a plurality of partition walls formed on the adhesive layer in a direction perpendicular to the first electrode and formed of photoresist, and an organic light emitting layer formed on the adhesive layers on both sides of the partition wall; And an encapsulation layer formed on the entire surface including the second electrode formed on the organic electroluminescent layer.

Another feature of the invention is a first step of forming a plurality of first electrodes having a predetermined distance in one direction on the substrate, and the following formula 1, formula 2, formula 3:

(Wherein R is a substance selected from alkyl, amine,

R ₁ , R ₂ , R ₃ , R ₄ , R ₅ , R ₆ is a substance selected from H group, alkyl group,

R ₁ , R ₂ , R ₃ , R ₄ , R ₅ , R ₆ are all the same or not the same,

X ₁ , X ₂ , X ₃ , X ₄ is a substance selected from halogen group, methoxy group, ethoxy group,

X ₁ , X ₂ , X ₃ , X ₄ are all the same or not the same)

A second step of forming an adhesive layer made of a material having any one of formulas, a third step of forming a plurality of partition walls having a predetermined distance in a direction perpendicular to the first electrode on the adhesive layer, and an organic material on the front surface including the partition walls The fourth step of sequentially forming the electroluminescent layer and the second electrode, and the fifth step of forming the encapsulation layer on the entire surface including the second electrode.

Referring to the accompanying drawings, a method of manufacturing an organic light emitting display device according to the present invention having such a feature is as follows.

The concept of the present invention is to improve the adhesion between the substrate and the partition wall, the first electrode and the partition wall by surface treatment with a material having a hydrophobic functional group to make the surface of the hydrophilic substrate hydrophobic.

3A to 3D are cross-sectional views illustrating a process of manufacturing an organic light emitting display device according to the present invention. As shown in FIG. 3A, an indium tin oxide (ITO) material is formed on a glass substrate 11. The ITO material is patterned to form a plurality of first electrodes 12 having a predetermined interval in one direction in a stripe shape.

3B, the following Chemical Formula 1, Chemical Formula 2, Chemical Formula 3 may be placed on the entire surface of the glass substrate 11 including the first electrode 12.

(Wherein R is a substance selected from alkyl, amine,

R ₁ , R ₂ , R ₃ , R ₄ , R ₅ , R ₆ is a substance selected from H group, alkyl group,

R ₁ , R ₂ , R ₃ , R ₄ , R ₅ , R ₆ are all the same or not the same,

X ₁ , X ₂ , X ₃ , X ₄ is a substance selected from halogen group, methoxy group, ethoxy group,

X ₁ , X ₂ , X ₃ , X ₄ are all the same or not the same)

An adhesive layer 13 made of a material having any one of formulas is formed.

Here, in addition to the materials listed above, the material used as the adhesive layer 13 may be a material having at least one functional group reacting with a hydrophilic functional group and having at least one hydrophobic functional group.

As such, the reason for forming the adhesive layer 13 with the above materials is to improve the adhesive force with the partition wall to be formed in the next step.

That is, since the surfaces of the glass substrate 11 and the first electrode 12 are hydrophilic, the adhesion between the hydrophobic partition walls is poor.

This is because, as described above, the properties of the two layers in contact are different.

Therefore, when the surface of the glass substrate 11 and the first electrode 12 is surface treated with materials having the above formula in order to make the surfaces of the glass substrate 11 and the first electrode 12 hydrophobic having the same properties as the partition wall, the functional groups of the barrier material and the glass substrate 11 ), The bonding force with the functional groups on the surface of the first electrode 12 is improved, and thus the adhesive force with the partition wall is improved.

Here, the method of surface-treating the substrate hydrophobicly may be a chemical surface treatment method or a physical surface treatment method.

Chemical surface treatment is a method corresponding to the case using the material having the formula (1) or (2), the following three cases are possible.

First, the glass substrate 11 having the first electrode 12 formed is dipped into the material solution having Formula 1 or Formula 2, and then dried by applying heat or the like.

Second, after spin-coating a material having Formula 1 or Formula 2 on the glass substrate 11 on which the first electrode 12 is formed, it is dried by applying heat or the like.

Third, after the material having Formula 1 or Formula 2 is made of a vapor in a vacuum oven, the glass substrate 11 having the first electrode 12 formed thereon is exposed to the vapor atmosphere.

In addition, the physical surface treatment method corresponds to the case of using the material having Chemical Formula 3, and the glass substrate 11 having the first electrode 12 formed on the plasma by making the material having Chemical Formula 3 into plasma. Expose

The thickness of the adhesive layer 13 formed by such a method is so good that it is thin, but about 5 kPa-about 500 kPa is suitable.

As shown in FIG. 3C, a plurality of partition walls 14 having a predetermined interval in a direction perpendicular to the first electrode 12 are formed on the adhesive layer 13 for electrical insulation between pixels.

Subsequently, as shown in FIG. 3D, the organic electroluminescent layer 15 and the second electrode 16 each including the hole injection transport layer, the light emitting layer, the electron injection transport layer, and the like are sequentially formed on the front surface including the partition wall 14, thereby forming the partition wall. The organic electroluminescent layer 15 and the second electrode 16 are separated on both sides of the partition wall 14 with the intervening portion 14 therebetween to allow pixelation.

In addition, an encapsulation layer 17 including a protective film, a moisture absorbing film, and a moisture proof film is formed on the entire surface including the second electrode 16 to manufacture an organic light emitting display device.

The organic light emitting display device and its manufacturing method according to the present invention have the following effects.

By hydrophobically treating the surface of the substrate on which the first electrode is formed, the adhesive force with the partition wall can be improved to increase the yield of the device.

Claims (5)

In the organic light emitting device having a plurality of pixels consisting of a first electrode, an organic electroluminescent layer, a second electrode, Board; Barrier ribs formed on the substrate and the first electrode for electrical insulation between the pixels; And, And an adhesive layer formed between the substrate and the partition wall, the first electrode and the partition wall, and made of a material having a hydrophobic functional group. The method of claim 1, wherein the adhesive layer is represented by Formula 1, Formula 2, Formula 3: (Wherein R is a substance selected from alkyl, amine, R ₁ , R ₂ , R ₃ , R ₄ , R ₅ , R ₆ is a substance selected from H group, alkyl group, R ₁ , R ₂ , R ₃ , R ₄ , R ₅ , R ₆ are all the same or not the same, X ₁ , X ₂ , X ₃ , X ₄ is a substance selected from halogen group, methoxy group, ethoxy group, X ₁ , X ₂ , X ₃ , X ₄ are all the same or not the same) An organic light emitting device, characterized in that consisting of a material having any one of formulas. The organic light emitting device of claim 1, wherein the adhesive layer has a thickness of 5 kPa to 500 kPa. A first step of forming first electrodes, the plurality of transparent electrodes having a predetermined distance in one direction on the substrate; Forming a hydrophobic adhesive layer on an entire surface of the substrate including the first electrodes, A third step of forming a plurality of partition walls having a predetermined distance in the direction perpendicular to the first electrode on the adhesive layer with photoresist; A fourth step of sequentially forming an organic light emitting layer and a second electrode on the entire surface including the barrier ribs; And, And a fifth step of forming an encapsulation layer on the entire surface including the second electrode. The method of claim 4, wherein the second step of forming the adhesive layer having the hydrophobicity, Immersing the substrate in a hydrophobic material solution, spin-coating a hydrophobic material on the substrate, exposing the substrate to a vapor of a hydrophobic material, or subjecting the substrate to hydrophobicity. The organic electroluminescent device manufacturing method, characterized in that any one of the methods of exposing to a plasma made of a material having a.