JP2002231441A - Organic el panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an organic EL panel for maintaining a stable light emitting characteristic over a long period by restraining generation of a dark spot by infiltration of moisture into an organic EL element, preventing the occurrence of a leak current, cross talk, and a flaw of a laminated body by arranging an adsorbing member, and realizing a thin type. SOLUTION: This organic EL panel 1 has the laminated body for sandwiching at least one or more layers of organic layers 5 including a light emitting layer by a first electrode (a transparent electrode 3), and a second electrode (a back plate 6), has a light transmissive support substrate (a glass substrate 2) for arranging the laminated body, has a sealing member 7 for arranging the laminated body on the support substrate (the glass substrate 2) via an adhesive 8 so as to be airtightly sealed, and has the nonfluid adsorbing member 9 partially arranged on the laminated body, and having the moisture absorbing action.

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 Conventionally, as such an organic EL panel, for example, as disclosed in JP-A-7-169567, a transparent support substrate made of a glass material is provided on an ITO (indium tin) substrate serving as an anode. a transparent electrode (first electrode) such as an oxide, an organic layer having at least a light emitting layer made of an organic compound, and a non-translucent back electrode (second electrode) such as aluminum (Al) serving as a cathode. 2. Description of the Related Art There is known an organic EL panel in which a laminate is formed by laminating, and a protective layer containing an adsorbent and a sealing layer which cover the whole of the laminate are laminated outside the laminate.

Further, as disclosed in JP-A-9-35868, a transparent electrode such as ITO serving 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 laminated organic layer and a non-transparent back electrode made of aluminum (Al) or the like serving as a cathode are sequentially laminated to form a laminate, and a concave-shaped sealing can (sealing) made of a glass material covering the laminate is formed. A stop member) is hermetically disposed on the support substrate via an adhesive, and a dissolved oxygen concentration of 1 p of an inert liquid containing an adsorbent is provided on the outer periphery of the laminate.
An organic EL panel that seals the laminate by providing a sealing layer of pm or less is known.

Further, a transparent electrode such as ITO serving 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 as disclosed in Japanese Patent Application Laid-Open No. 9-148066. 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 a concave-shaped sealing can made of a glass material covering the laminate is formed as described above. Formed on a supporting substrate in a gas-tight manner via an adhesive, and formed on the surface of the sealing can facing the laminate by a compound that chemically adsorbs moisture and maintains a solid state even when adsorbed. An organic EL panel provided with a suction member to be used is known.

With such a structure, the organic EL of the organic layer
It is possible to lower the humidity inside the element and prevent the element from becoming a high humidity state. As a result, the moisture adsorbed on the surface of the component of the organic EL element or the organic EL element, which is one of the causes of the deterioration of the light emission characteristics of the organic EL element,
Moisture that has penetrated into the device penetrates into the laminate formed by sequentially laminating the transparent electrode, the organic layer, and the back electrode from a defect on the surface of the back electrode, and the organic layer and the back surface. It is possible to prevent generation of a part (dark spot) that does not emit light due to the occurrence of a gap between the electrode and the electrode and the elimination of current.

[0006]

However, in the structure disclosed in Japanese Patent Application Laid-Open No. 7-169567, in which the protective layer containing the adsorbent and the sealing layer covering the entire laminate are laminated. Is that, by further laminating the protective layer and the sealing layer on the laminate, the current flow in the laminate varies, so that leakage current and crosstalk easily occur, which adversely affects the light emission characteristics of the organic EL panel. There is a problem that

Further, in a structure disclosed in JP-A-9-35868, in which the sealing layer made of the inert liquid containing the adsorbent is provided on the outer periphery of the laminate, the sealing is performed. Since the adsorbent in the layer flows and comes into contact with the back electrode, there is a problem that the back electrode is easily damaged, and as a result, the light emission appearance of the entire organic EL panel is abnormal.

Further, as disclosed in Japanese Patent Application Laid-Open No. Hei 9-148066, water is chemically adsorbed on the surface of the sealing can facing the laminate, and a solid state is maintained even if the water is adsorbed. In the configuration in which the adsorbing member formed of a compound is provided, a certain distance (usually 0.1 mm) is provided between the laminate and the adsorbing member in order to prevent the adsorbing member from contacting the laminate. 5 to 1.0 mm), which is a problem when thinning the organic EL panel.

In view of such problems, the present invention relates to an organic EL
Stable light emission characteristics are maintained over a long period of time by suppressing the generation of dark spots due to the intrusion of moisture into the element, and the occurrence of leak current, crosstalk, and damage to the laminate due to the provision of the adsorption member is prevented. It is another object of the present invention to provide an organic EL panel which can be made thinner.

[0010]

According to the present invention, at least one organic layer including a light emitting layer is formed by a first electrode and a second electrode. , A translucent support substrate on which the laminate is disposed, and a sealing member disposed on the support substrate so as to hermetically seal the laminate via an adhesive. And an adsorbent member having a moisture absorbing action and having no fluidity and partially disposed on the laminate.

According to a second aspect of the present invention, there is provided a laminate in which at least one or more organic layers including a light emitting layer are sandwiched between a first electrode and a second electrode, and a light-transmitting member in which the laminate is provided. Support substrate, a sealing member disposed on the support substrate so as to hermetically seal the laminate through an adhesive, and moisture absorption disposed on a non-light-emitting portion on the laminate. And a non-fluid suction member having an action.

According to a third aspect of the present invention, there is provided a laminate in which at least one or more organic layers including a light emitting layer are sandwiched between a first electrode and a second electrode, and a light-transmitting member in which the laminate is provided. A supporting substrate, a sealing member disposed on the supporting substrate so as to hermetically seal the laminate through an adhesive, and a moisture absorbing member partially disposed on the second electrode. And a non-fluid suction member having an action.

According to a fourth aspect of the present invention, there is provided a laminate in which at least one or more organic layers including a light emitting layer are sandwiched between a first electrode and a second electrode, and a light-transmitting member in which the laminate is provided. A support member, a sealing member disposed on the support substrate so as to hermetically seal the laminate through an adhesive, and a non-light-emitting portion on the second electrode. And a non-flowable adsorption member having a moisture absorbing action.

Further, in any one of the first to fourth aspects, as described in the fifth aspect, the suction member is provided so as to support the sealing member.

[0015] With this configuration, by disposing an adsorption member that is partially non-fluid on the laminate, it is possible to suppress the generation of dark spots due to the intrusion of moisture into the organic EL element, and it is possible to achieve a long-term operation. Stable light emission characteristics can be maintained.

Further, since the adsorbing member is partially disposed on the laminate, it is possible to prevent occurrence of a leak current and crosstalk.

Further, by disposing the adsorbing member having no fluidity, it is possible to prevent the adsorbent particles in the adsorbing member from flowing and causing damage to the laminate.

Further, by disposing the adsorbing member on the laminate, no space is required for preventing the laminate and the adsorbing member from coming into contact with each other, so that the thickness can be further reduced.

[0019]

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

In FIGS. 1 and 2, an organic EL panel 1 is shown.
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 depositing a conductive material such as ITO on the glass substrate 2 by means such as a vapor deposition method or a sputtering method.
a, 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 may 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 in a flat plate member made of, for example, a glass material. 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. And the glass substrate 2 constitute a sealing space 11 for sealing the laminate 10. The sealing member 7 includes the electrode portion 3 of the transparent electrode 3.
c and the electrode portion 6b of the back electrode 6 is slightly smaller than the glass substrate 2 so as to be exposed to the outside.

The adsorbing member 9 is a liquid containing an adsorbent (eg, activated alumina 300 mesh manufactured by Wako Pure Chemical Industries, Ltd.) made of, for example, a powder having a moisture absorbing 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 and FIG.
Area other than light emitting portion 6c on back electrode 6 (non-light emitting portion)
, And then dried and disposed.

The organic EL panel 1 includes a laminate 10 in which an organic layer 5 is sandwiched between a transparent electrode 3 and a back electrode 6, and a glass substrate 2 on which the laminate 10 is provided. The laminated body 10 is hermetically sealed by disposing the adhesive 7 on the glass substrate 2 with an adhesive 8 therebetween, and the non-fluid suction member 9 is partially disposed on the non-light-emitting portion on the back electrode 6. It is characterized by having a structure to be installed.

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, since the adsorption member 9 having no fluidity is partially disposed on the back electrode 6, there is a problem in the organic EL panel in which a protective layer covering the entire laminate is laminated as in the related art. Leakage current and crosstalk can be prevented from occurring. In particular, when the disposing position of the adsorbing member 9 is limited to the non-light-emitting portion on the back electrode 6, the adsorbing member 9 is disposed only at a portion where no current is applied, and therefore, a variation in energization in the laminate 10 occurs. There is no adverse effect on the emission characteristics of the organic EL panel.

Further, by disposing a non-fluidity adsorbing member for mixing the adsorbent and the adhesive as the adsorbing member 9, the inert material containing the adsorbent is provided on the outer periphery of the laminate as in the prior art. It is possible to prevent the problem of the organic EL panel provided with the liquid sealing layer, that is, the flow of the adsorbent particles and the generation of scratches on the laminate.

Further, by disposing the sealing member 9 on the back electrode 6, compared with the conventional organic EL panel in which the adsorbing member is disposed on the surface of the sealing plate facing the laminated body, the lamination is improved. An interval for preventing the body and the sealing plate from contacting each other becomes unnecessary, and the organic EL panel can be formed thinner.

Next, a second embodiment of the present invention will be described with reference to FIG. 4. The same or corresponding portions as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. Omit.

The difference from the above-described embodiment is that the suction member 9 is provided so as to support the sealing member 7.

The adsorbing member 9 is disposed partially on the non-light emitting portion on the back electrode 6 and in contact with the sealing member 7.

Therefore, in the organic EL panel 1, even if the sealing member 7 is bent by an external force, the bending of the sealing member 7 is suppressed by the suction member 9 serving as a stopper. Laminated body 10 and sealing member 7
Does not interfere with each other, and there is no possibility that the sealing member 7 may damage or break the laminate 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.

In the embodiment of the present invention, the adsorbing member 9 is configured to be partially disposed on the back electrode 6. However, the organic layer 5 on the insulating layer 4 and the back electrode 6 are laminated. It may be configured to be provided in a part that is not provided.

Further, in the embodiment of the present invention, the adsorbing member 9 is formed by mixing a liquid containing an adsorbent composed of a powder having a moisture absorbing action and an adhesive, so that the paste-like adsorbing member 9 is Partially applied to the non-light emitting portion on the back electrode 6,
Although it was configured to be further dried and arranged,
May be configured to use a resin having a moisture absorbing action such as a nylon-based resin.

The adsorbing member 9 may have a constitution in which a predetermined amount of the adsorbent is mixed into 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.

Further, the adsorbing member 9 may be configured such that the adsorbent is disposed on a double-sided sealing member made of an inactive base material disposed on a non-light emitting portion on the back electrode 6.

[0044]

According to the present invention, a sealing member is attached to a glass substrate on a support substrate provided with a laminate in which an organic layer having at least a light emitting layer is sandwiched between a first electrode and a second electrode. The laminate is sealed by disposing the adsorbent member on the laminate, and the adsorbing member is partially disposed on the laminate.
An organic EL panel in which the generation of dark spots due to the intrusion of moisture into the L element can be suppressed, stable light emission characteristics can be maintained for a long time, and a protective layer covering the entire laminate as in the related art is laminated. It is possible to suppress the occurrence of leakage current and crosstalk, which are problems of the above. In particular, when the disposing position of the adsorbing member is limited to a non-light emitting portion on the back electrode, the adsorbing member is disposed only on a portion that is not energized. In addition, there is no adverse effect on the light emission characteristics of the organic EL panel.

Further, by disposing a non-flowable adsorbing member as the adsorbing member, the adsorbent particles contained in the adsorbing member do not flow and come into contact with the laminated body,
It is possible to prevent the occurrence of scratches and the like of the laminate, which is a problem of the organic EL panel in which the sealing layer made of the inert liquid containing the adsorbent is provided around the periphery of the laminate as in the related art.

In addition, by disposing the sealing member on the laminate, no space is required for the laminate and the sealing member not to come into contact with each other. The organic EL panel can be formed thinner than an organic EL panel in which an adsorbing member is provided on a surface to be formed.

Further, by disposing the suction member so as to support the sealing member, even if the sealing member is bent by an external force, the suction member plays a role of a stopper to seal the sealing member. Since the bending of the stop member is suppressed, the laminate and the sealing member do not interfere with each other, and the sealing member does not damage or damage the laminate.

[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 a sectional view of a main part of the organic EL panel according to the first embodiment;

FIG. 3 is an explanatory view showing an arrangement position of the above-mentioned suction member.

FIG. 4 is an essential part cross-sectional view of an organic EL panel according to a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 organic EL panel 2 glass substrate (supporting substrate) 3 transparent electrode (first electrode) 5 organic layer 6 back electrode (second electrode) 7 sealing plate (sealing member) 8 adhesive 9 adsorbing member 10 laminate 11 sealing Stop space

Claims (5)

[Claims] 1. A laminate in which at least one or more organic layers including a light emitting layer are sandwiched between a first electrode and a second electrode, a light-transmitting support substrate on which the laminate is provided, and the support substrate A sealing member disposed on the laminate so as to hermetically seal the laminate through an adhesive, and a non-fluid suction member having a moisture absorbing action partially disposed on the laminate. An organic EL panel comprising: 2. A laminate in which at least one or more organic layers including a light emitting layer are sandwiched between a first electrode and a second electrode, a light-transmitting support substrate on which the laminate is provided, and the support substrate A sealing member disposed on the laminate so as to hermetically seal the laminate through an adhesive, and a non-fluid suction member having a moisture-absorbing action disposed on a non-light-emitting portion on the laminate. And an organic EL panel comprising: 3. A laminate in which at least one or more organic layers including a light-emitting layer are sandwiched between a first electrode and a second electrode, a light-transmitting support substrate on which the laminate is provided, and the support substrate A sealing member disposed on the second electrode so as to hermetically seal the laminate via an adhesive, and a moisture-absorbing non-fluid adsorption member partially disposed on the second electrode And an organic EL panel comprising: 4. A laminate in which at least one or more organic layers including a light-emitting layer are sandwiched between a first electrode and a second electrode, a light-transmitting support substrate on which the laminate is provided, and the support substrate A sealing member disposed on the laminate so as to hermetically seal the laminate via an adhesive, and a non-fluid suction having a moisture absorbing action disposed on a non-light emitting portion on the second electrode And an organic EL panel. 5. The device according to claim 1, wherein the suction member is provided so as to support the sealing member.
The organic EL panel according to any one of the above.