JP2002280168A - Organic EL panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a generation of a dark spot due to intrusion of moisture into an organic EL element to maintain stable light emitting characteristics for a long period of time, and to damage a laminated body by providing an adsorbent. Provided is an organic EL panel that can prevent the occurrence of the like and can be made thin. SOLUTION: An organic EL panel 1 has a light-transmitting support substrate (laminate) in which at least an organic layer 5 having a light emitting layer is sandwiched between a first electrode (transparent electrode 3) and a second electrode (back electrode 6). It is arranged on a glass substrate 2). The laminate is hermetically covered with a sealing member 7. An arrangement portion 7d is formed on the sealing member 7 so as to face a region of the support substrate (glass substrate 2) where the laminate is not formed. There is an adsorbing member 9 having a moisture absorbing function disposed in the disposing portion 7d.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of disposing a laminate comprising at least an organic layer having a light-emitting layer between a first electrode and a second electrode on a light-transmitting support substrate, and The present invention relates to an organic EL (electroluminescence) panel that accommodates the laminate by disposing a sealing member on the panel.

[0002]

2. Description of the Related Art As an organic EL panel, a glass substrate (translucent supporting substrate) made of a glass material is formed on an ITO substrate.
(Indium Tin Oxide) or the like, a transparent electrode (first electrode) serving as an anode, an organic layer including a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer, and aluminum (Al) serving as a cathode. And a non-translucent back electrode (second electrode) are sequentially laminated to form an organic EL element as a laminate, and a concave sealing member made of a glass material covering the laminate is placed on the glass substrate. In addition, an air-tight adhesive is provided via an ultraviolet curable adhesive, and an adsorbent having a moisture absorbing effect is provided in an air-tight space obtained by the glass substrate and the sealing member.

[0003] Such an organic EL panel is required to have durability to withstand long-term light emission. One of the causes of deterioration of the light emission characteristics of the organic EL element is the occurrence of dark spots. The dark spot is caused by the moisture adhering to the surface of the component of the organic EL element or the organic EL element.
Moisture that has penetrated into the element penetrates into the laminate formed by sequentially laminating the transparent electrode, the organic layer, and the back electrode from a defect or the like on the surface of the back electrode, and the organic layer and the back electrode. This is caused by causing a deviation between

[0004] In order to solve such a problem,
As disclosed in Japanese Patent Application Laid-Open No. 9-148066, an anode I serving as an anode is provided on a light-transmitting supporting substrate made of a glass material.
A transparent electrode such as TO, an organic layer having at least a light emitting layer made of an organic compound, and aluminum (A
1) and a non-light-transmitting back electrode is sequentially laminated to form a laminate, and a concave sealing member made of a glass material covering the laminate is hermetically sealed on the support substrate via an adhesive. Organic EL, wherein an adsorbent formed of a compound that adsorbs moisture chemically and maintains a solid state even when adsorbed is disposed on a surface of the sealing member opposed to the laminate.
Panels are known.

Further, as disclosed in Japanese Patent Application Laid-Open No. 12-164349, a transparent electrode such as ITO, which serves as an anode, and at least a light emitting layer made of an organic compound are provided on a transparent support substrate made of a glass material. The organic layer and a non-light-transmitting back electrode such as aluminum (Al) serving as a cathode are sequentially laminated to form a laminate, and the concave-shaped sealing member made of a glass material that covers the laminate is formed as described above. An organic EL panel is hermetically disposed on a support substrate via an adhesive, a powder adsorbent is disposed in a concave portion formed in the sealing member, and the concave portion is covered with a sealing member. Have been.

[0006]

However, in the former, when the adsorbent comes into contact with the laminate,
In order to prevent the laminate from being scratched or the like and the adsorbent coming into contact with the laminate, a certain distance (usually 0.5 to 1.0 mm) is provided between the laminate and the adsorbent. )
Is required, which hinders the thinning of the organic EL panel.

In the latter, although the laminate can prevent the laminated body from contacting with the adsorbent, the sticker needs to be adhered to the organic EL panel. There has been a problem that the structure is complicated and the cost is high.

The present invention has been made in view of the above problems, and has been developed in consideration of the problems with organic
Stable light emission characteristics are maintained for a long time by suppressing the generation of dark spots due to the intrusion of moisture into the L element, and the occurrence of scratches and the like on the laminate due to the provision of the adsorbent is prevented, and the thickness is reduced. It is an object of the present invention to provide an organic EL panel capable of performing the following.

[0009]

According to the present invention, in order to solve the above-mentioned problems, at least an organic layer having a light emitting layer is firstly formed.
An organic EL panel in which a laminate sandwiched between an electrode and a second electrode is disposed on a light-transmitting support substrate, and the laminate is hermetically covered with a sealing member. An arrangement portion formed so as to face a region of the substrate where the laminated body is not formed, and a suction member having a moisture absorbing action arranged in the arrangement portion.

[0010] Further, the disposing portion includes a supporting portion formed on the sealing member and fixed on the supporting substrate via an adhesive, and the laminated body of the supporting substrate of the sealing member. And a projection formed by projecting from a region opposed to the region not to be formed.

The projecting portion is formed so as to have a gap between the projecting portion and the supporting substrate facing the projecting portion.

The adsorbing member does not flow under a normal use environment.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2, an organic EL panel 1
Are a glass substrate (supporting substrate) 2, a transparent electrode (first electrode) 3, an insulating layer 4, an organic layer 5, a back electrode (second electrode) 6, a sealing member 7, an adhesive 8, And an adsorbing member 9.

The glass substrate 2 is a light-transmitting support substrate having a rectangular shape.

The transparent electrode 3 is formed by forming a conductive material such as ITO into a predetermined shape on the glass substrate 2 by means such as a vapor deposition method or a sputtering method. And a lead portion 3b drawn out from each segment, and an electrode portion 3c provided at the end of the lead portion 3b. Note that the electrode portions 3c are intensively arranged on one side of the glass substrate 2.

The insulating layer 4 is made of, for example, a polyimide-based insulating material, and is formed by, for example, a photolithography method. The insulating layer 4 has a window 4a corresponding to the display segment 3a and a cutout 4b corresponding to an electrode portion of the back electrode 6 described later. 3, a window 4a is formed so as to slightly overlap with the peripheral edge of the display segment 3a,
In addition, in order to secure insulation between the transparent electrode 3 and the back electrode 6, it is provided so as to cover the lead portion 3b.

The organic layer 5 only needs to have at least a light emitting layer. In the embodiment of the present invention, the hole injection layer, the hole transport layer, the light emitting layer and the electron transport layer are formed by a vapor deposition method or a sputtering method. And the like. The organic layer 5 is formed by a window 4 a in the insulating layer 4.
Are arranged with a predetermined size so as to correspond to the formation places of the.

The back electrode 6 is made of aluminum (Al), aluminum lithium (Al: Li), magnesium silver (Mg: Ag).
Is formed by a method such as a vapor deposition method or a sputtering method using a conductive material made of metal such as, and is disposed on the organic layer 5. The back electrode 6 is electrically connected to a lead portion 6a provided on one side of the glass substrate 2 on which the respective electrode portions 3c of the transparent electrode 3 are formed. Note that an electrode portion (lead portion) 6b is provided at the end of the lead portion 6a, and the lead portion 6a and the electrode portion 6b are formed of the same material as the transparent electrode 3.

As described above, the transparent electrode 3, the insulating layer 4, the organic layer 5, and the back electrode 6 are sequentially laminated on the glass substrate 2 to obtain a laminate 10.

The sealing member 7 is formed by forming a concave portion 7a on a flat plate member made of, for example, a glass material by an appropriate method such as sandblasting, cutting and etching. The sealing member 7 is formed by hermetically arranging a support portion 7b formed so as to surround the concave portion 7a on the glass substrate 2 via, for example, an ultraviolet curing epoxy resin adhesive 8. Space 1 for sealing the laminate 10 with the glass substrate 2
1. The sealing member 7 includes an electrode portion 3c of the transparent electrode 3.
And it is configured to be slightly smaller than the glass substrate 2 so that the electrode portion 6b of the back electrode 6 is exposed to the outside.

As shown in FIG. 2, the protruding portion 7c protrudes from the sealing member 7 and faces a region of the glass substrate 2 where the laminate 10 is not formed. Further, the projection 7c and the glass substrate 2
Is provided with a gap.

As shown in FIG. 2, the disposing portion 7d comprises a concave portion formed by the supporting portion 7b and the protruding portion 7c.
An adsorbing member 9 described in detail later is provided. Also, the arranging unit 7d
As shown in FIG. 3A, the protrusion 7c is formed so as to surround a region of the glass substrate 2 where the laminated body 10 is not formed by the support 7b.

The adsorbing member 9 is a liquid containing an adsorbent (for example, activated alumina 300 mesh manufactured by Wako Pure Chemical Industries, Ltd.) made of, for example, a powder having a hygroscopic action (eg, Demnum S manufactured by Daikin Industries, Ltd.). -20) and an adhesive made of the same material as the adhesive 8 and having no fluidity. Here, “no fluidity” refers to a property in which the arrangement position does not fluctuate under a normal use environment. As shown in FIG. 2, the paste-like adsorption member 9 is
d), and further dried and disposed.

In such an organic EL panel 1, an arrangement portion 7d is formed on the sealing member 7 so as to face an area where the laminated body 10 of the glass substrate 2 is not formed, and the adsorbing member 9 is provided on the arrangement portion 7d.
Is provided.

Therefore, the organic EL panel 1 is
By disposing the adsorbing member 9 in the sealing space 11 in which is sealed, it is possible to suppress the generation of dark spots due to the intrusion of moisture into the organic EL element, and maintain stable light emitting characteristics for a long time. be able to.

Further, by disposing the adsorbing member 9 in the disposing portion 7d formed on the sealing member 7 so as to face the region where the laminated body 10 of the glass substrate 2 is not formed, the adsorbing member 9 is provided.
Can be prevented from coming into contact with the laminate 10 and causing damage to the laminate 10.

Further, unlike the related art, there is no need to provide an interval for preventing the adsorption member 9 from coming into contact with the laminate 10, so that the organic EL panel can be made thinner.

Further, since there is no need to attach a sealing member as in the conventional case, the structure of the organic EL panel 1 can be simplified and the manufacturing cost can be reduced.

The mounting portion 7d is connected to the support portion 7b and the protrusion 7
By forming the component c, it is possible to reduce the number of components provided exclusively for forming the arrangement portion 7d, so that the structure of the organic EL panel 1 can be simplified and the manufacturing cost can be reduced.

Further, by providing a gap between the protruding portion 7c and the glass substrate 2, the sealing space 11 and the disposing portion 7d are communicated with each other, and moisture in the sealing space 11 is efficiently transferred to the adsorbing member 9. Can be absorbed.

By arranging the adsorbing member 9 having no fluidity in the normal use environment in the disposing portion 7d, the adsorbing member 9 moves to the area where the laminate 10 is formed, and It is possible to prevent the occurrence of scratches or the like due to contact with the reference numeral 10.

In the embodiment of the present invention, the sealing member 7
Although a flat member made of a glass material is used in the first embodiment, the sealing member 7 may be a recessed sealing can made of a metal material.

Further, in the embodiment of the present invention, the disposing unit 7
d is a configuration formed of a concave portion formed by the supporting portion 7b and the protruding portion 7c, and the protruding portion 7c is formed so as to surround the region of the glass substrate 2 where the laminated body 10 is not formed by the supporting portion 7b. However, depending on the shape of the laminate 10, the disposing portion 7 d projects the protrusion 7 c from the sealing member 7, and faces the region of the glass substrate 2 where the laminate 10 is not formed, and forms the outer wall that forms the support portion 7 b. 3 may be formed so as to be substantially parallel to one side, and may be constituted by a groove formed by the support portion 7b and the protruding portion 7c (FIG. 3).
(B)).

The arranging portion 7d is formed so that the projecting portion 7c projects from the sealing member 7 and surrounds the laminated body 10, and the laminated body 10 formed by the supporting portion 7b and the projecting portion 7c.
(FIG. 3 (c)).
reference).

Further, in the embodiment of the present invention, the adsorbing member 9 has a structure in which a liquid containing an adsorbent made of a powder having a moisture absorbing action is mixed with an adhesive. May be configured to use a resin having a moisture absorbing action such as a nylon resin.

The adsorbing member 9 may have a constitution in which a predetermined amount of the adsorbent is mixed in an inert liquid made of, for example, a fluorine-based oil to form a cream.

The adsorbing member 9 may have a structure in which the adsorbent is contained in an inert gel member such as a fluorine-based gel.

[0039]

According to the present invention, a laminate in which at least an organic layer having a light emitting layer is sandwiched between a first electrode and a second electrode is disposed on a light-transmitting support substrate, and the laminate is sealed with a sealing member. An organic EL panel hermetically covered by the sealing member, an arrangement portion formed on the sealing member so as to face a region where the laminate of the support substrate is not formed, and an arrangement portion disposed on the arrangement portion. And an adsorption member having a moisture absorbing action, while maintaining stable light emission characteristics for a long time by suppressing the occurrence of dark spots due to intrusion of moisture into the laminate, It is possible to provide an organic EL panel that can prevent the laminated body from being damaged or the like due to the provision of the suction member and can be made thin.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an organic EL panel according to an embodiment of the present invention.

FIG. 2 is an essential part cross-sectional view showing the same organic EL panel.

FIG. 3 is a diagram showing a formation position of an arrangement portion of the organic EL panel according to the first embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 organic EL panel 2 glass substrate (support substrate) 3 transparent electrode (first electrode) 5 organic layer 6 back electrode (second electrode) 7 sealing member 7 b support portion 7 c protrusion 7 d disposition portion 8 adhesive 9 adsorption member 10 laminated body 11 sealed space

Claims (4)

[Claims] An organic layer having at least a light emitting layer is a first layer.
An organic EL panel in which a laminate sandwiched between an electrode and a second electrode is disposed on a light-transmitting support substrate, and the laminate is hermetically covered with a sealing member. An organic EL, comprising: an arrangement portion formed to face a region of the substrate where the laminated body is not formed; and an adsorption member having a moisture absorbing effect arranged in the arrangement portion. panel. 2. The disposing portion includes a supporting portion formed on the sealing member and fixed to the supporting substrate via an adhesive, and the laminated body of the supporting substrate of the sealing member is formed. 2. The organic EL panel according to claim 1, wherein the organic EL panel includes a concave portion formed by a projecting portion formed by projecting from a region opposed to the region not formed. 3. 3. The organic EL panel according to claim 2, wherein the projecting portion is formed so as to have a gap between the supporting substrate and the opposing supporting substrate. 4. The organic EL panel according to claim 1, wherein the adsorbing member does not flow under a normal use environment.