JP2015135993A - light-emitting panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-emitting panel and a lighting device capable of changing an outer shape.SOLUTION: A light-emitting panel is configured by connecting, at a hinge part that is easily bent light-emitting modules, including a thin planar light-emitting element sealed therein in which a layer including a light-emitting organic compound is provided between a pair of electrodes. In addition, wiring having flexibility is configured to be arranged across the hinge part by providing the wiring along the hinge part.

Description

The present invention relates to a light-emitting panel having a plurality of light-emitting elements and a lighting fixture. In particular, the present invention relates to a light-emitting panel including a plurality of light-emitting elements that emit light in a planar shape and a lighting fixture using the same.

An organic EL element has a structure in which a layer containing a light-emitting organic compound (also referred to as an EL layer) is sandwiched between a pair of electrodes. Light emission can be obtained from the light-emitting organic compound by applying a voltage to this element.

Since the organic EL element has a film shape, a light-emitting element with a large area can be easily formed. Further, the thickness can be reduced. A light-emitting panel provided with a light-emitting element with a large area can be applied to lighting or the like, for example. Note that the light-emitting panel is not necessarily formed of one light-emitting element, and a large-area light-emitting panel may be formed by arranging small light-emitting elements.

For example, Patent Document 1 discloses a lighting fixture using an organic EL element.

JP 2006-108651 A

Since the organic EL element is extremely thin, the organic EL element formed on the flexible substrate can be bent. However, when folded at a steep angle, the organic EL element is destroyed.

If the organic EL element having a large area is not folded, it may be difficult to handle after production in a factory. This is because flat and thin light-emitting panels cause difficulties in storage efficiency in warehouses, transportation efficiency in goods delivery, display efficiency in stores, and ease of handling when carried by consumers.

Further, the size of the organic EL element is determined depending on the size of the substrate that the production equipment can handle. However, since the light-emitting panel can be used for various purposes, it is desired to provide light-emitting panels with various shapes.

The present invention has been made under such a technical background. Therefore its purpose is
Another object is to provide a light-emitting panel whose outer shape can be changed variously. Another object is to provide a lighting device whose outer shape can be changed.

In order to achieve the above object, the present invention has focused on a structure in which light emitting elements that emit light in a planar shape (hereinafter referred to as planar light emitting elements) are connected to each other. And, by connecting the light emitting modules sealed with the thin surface light emitting elements with a hinge portion that can be easily bent,
We came up with a configuration that could be folded, and solved the above problems.

That is, according to one embodiment of the present invention, the first light-emitting element and the terminal electrically connected to the first light-emitting element are pulled out, and the first light-emitting element is sealed in a bag shape between sealing materials. The first sealing region to be stopped, the second light emitting element, and the terminal electrically connected to the second light emitting element are drawn out, and the second
A second sealing region that seals the light emitting element in a bag shape between the sealing materials, and a hinge portion that can be folded between the first sealing region and the second sealing region. Each of the first light-emitting element and the second light-emitting element is a light-emitting panel including a layer containing a light-emitting organic compound between a pair of electrodes.

The light-emitting panel of one embodiment of the present invention includes a hinge portion that can be easily bent between sealing regions including a planar light-emitting element. Thereby, the light emission panel which can be folded between two planar light emitting elements can be provided.

Another embodiment of the present invention is the above light-emitting panel in which wirings that are electrically connected to the light-emitting elements are provided along the hinge portion.

In the light-emitting panel of one embodiment of the present invention, wiring is provided along the hinge portion. Thereby, stress due to bending is hardly applied to the wiring, and disconnection of the wiring due to bending can be prevented.

Another embodiment of the present invention is the above light-emitting panel in which a wiring that has flexibility and is electrically connected to the light-emitting element is disposed across the hinge portion.

In the light-emitting panel of one embodiment of the present invention, flexible wiring is provided in a bent portion. Thereby, the stress by bending can be relieved and the disconnection of the wiring by bending can be prevented.

Another embodiment of the present invention is the above light-emitting panel including a severable hinge.

The light-emitting panel of one embodiment of the present invention includes a severable hinge portion outside a region where a light-emitting element whose reliability is impaired when exposed to the air is sealed. Thereby, it is possible to excise the light emitting element unit without breaking the sealing region including the light emitting element, and the size of the light emitting panel can be changed.

Another embodiment of the present invention is the above-described light-emitting panel that includes a mountain-folded hinge portion and a valley-folded hinge portion and has a double-wave type developable curved surface.

The light-emitting panel of one embodiment of the present invention includes a double corrugated developable curved surface. Thereby, it can fold by the so-called Miura folding method. The light emitting panel folded by the Miura folding method can be expanded or folded without applying excessive stress to the hinge portion and the vicinity thereof, and unnecessary stress is hardly applied to the sealing region adjacent to the hinge portion. As a result, it is possible to prevent the failure of the sealing region caused by the folding operation from impairing the reliability of the light-emitting panel.

Another embodiment of the present invention is the above light-emitting panel that can be deformed into a three-dimensional shape by refracting a hinge portion.

The light-emitting panel of one embodiment of the present invention is provided with a hinge portion so that a three-dimensional shape can be formed like origami. As a result, it is possible to take two forms, a planar form and a three-dimensional form. As a result, for example, light emission that is stored in a planar form without being bulky and emits light in various directions in a three-dimensional form. Can provide a panel.

Another embodiment of the present invention is a three-dimensional lighting fixture in which the hinge portion of the light-emitting panel is formed by being refracted.

In the lighting device of one embodiment of the present invention, the hinge portion of the light-emitting panel is folded to have a three-dimensional shape like origami. As a result, it can take two forms, a planar form and a three-dimensional form. As a result, for example, it is housed in a planar form without being bulky and emits light in various directions in a three-dimensional form. Can provide sparse instruments.

Note that in this specification, an EL layer refers to a layer provided between a pair of electrodes of a light-emitting element. Therefore, a light-emitting layer containing an organic compound that is a light-emitting substance sandwiched between electrodes is one embodiment of an EL layer.

ADVANTAGE OF THE INVENTION According to this invention, the light emission panel which can deform | transform an external shape can be provided. Or the lighting fixture which can deform | transform an external shape can be provided.

FIG. 6 illustrates a structure of a light-emitting panel according to an embodiment. FIG. 6 illustrates a structure of a light-emitting panel according to an embodiment. 3A and 3B each illustrate a structure of a light-emitting element according to an embodiment. FIG. 6 illustrates a structure of a light-emitting panel according to an embodiment. FIG. 6 illustrates a structure of a light-emitting panel according to an embodiment. FIG. 6 illustrates a structure of a light-emitting panel according to an embodiment. 3A and 3B each illustrate a structure of a light-emitting element according to an embodiment. 3A and 3B each illustrate a structure of a light-emitting element according to an embodiment.

Embodiments will be described in detail with reference to the drawings. However, the present invention is not limited to the following description, and it is easily understood by those skilled in the art that modes and details can be variously changed without departing from the spirit and scope of the present invention. Therefore, the present invention should not be construed as being limited to the description of the embodiments below. Note that in the structures of the invention described below, the same portions or portions having similar functions are denoted by the same reference numerals in different drawings, and
The repeated description is omitted.

(Embodiment 1)
In the present embodiment, a plurality of light emitting modules each having a planar light emitting element are connected by a hinge portion,
A light-emitting panel that can be folded will be described with reference to FIGS. Specifically, a first sealing region surrounding a first planar light emitting element and a terminal electrically connected to the light emitting element is drawn out, and surrounding the second planar light emitting element and emitting the light A light-emitting panel including a second sealing region from which a terminal electrically connected to the element is drawn out and a hinge portion therebetween will be described.

A top view of the light-emitting panel exemplified in this embodiment is illustrated in FIG. The light-emitting panel 150 includes a first light-emitting element 151a, a second light-emitting element 151b, a third light-emitting element 151c, and a fourth light-emitting element 151d. The first light emitting element 151a is surrounded by the first sealing region 152a, and the first light emitting element 151a
The wiring 111 a and the wiring 112 b that are electrically connected to the light emitting element 151 a of the light-emitting element 151 a include the sealing region 152.
It is drawn from a. Note that the wiring 111a, the wiring 112b, and the common wiring 110 are all provided along a hinge portion 153 described later.

Note that in this embodiment, the first light-emitting element 151a, a portion surrounded by the sealing region 152a and the sealing member that seals the first light-emitting element 151a, and a portion including the wiring 111a and the wiring 112a are included. The first light-emitting module is collectively referred to as the second light-emitting element 151 b and the sealing region 1.
52b, a portion surrounded by a sealing member for sealing the second light emitting element 151b, and a wiring 111b
And the part which consists of wiring 112b is collectively called a 2nd light emitting module.

The light emitting panel 150 includes a hinge portion 153 between the first light emitting element module and the second light emitting module. The hinge portion is provided with flexible wiring (hereinafter referred to as bent wiring) for electrically connecting a plurality of light emitting modules. For example, the bent wiring 181a is provided so as to electrically connect the wiring 112a of the first light emitting element module and the wiring 111b of the second light emitting module.

Note that an extraction terminal electrically connected to the light-emitting module is provided at an end portion of the light-emitting panel exemplified in this embodiment. Specifically, the terminal 180 provided at the end of the light-emitting panel 150 and the common wiring 110 are electrically connected. Also, the takeout terminal 18
The wiring 111a of the first and first light emitting modules is electrically connected.

The light emitting panel 150 having such a configuration is, for example, a second structure using a short ring 189.
If the wiring 112b of the light emitting module and the common wiring 110 are connected and power is supplied to the extraction terminal 180 and the extraction terminal 181 from the driving power source, the first light emitting module and the second light emitting module connected in series are driven. it can.

The cross-sectional structure of the light-emitting panel exemplified in this embodiment is illustrated by using cutting lines AA ′ and B− shown in FIG.
This will be described with reference to a cross-sectional view at B ′ (FIG. 2). The details of the structure of the light emitting module provided in the light emitting panel will be described with reference to FIG.

The first light-emitting element 151 a includes a first electrode 101 provided over the substrate 100 and the first electrode 1.
Partition 104 covering the end of 01, second electrode 102, first electrode 101, and second electrode 1
02 includes a layer 103 containing a light-emitting organic compound. Further, a terminal 111 electrically connected to the first electrode 101 and a terminal 112 electrically connected to the second electrode 102 are provided (
(See FIG. 3).

The first light emitting element 151a is sealed in a space isolated from the atmosphere. In this embodiment, the first light-emitting element 151a is sealed together with the substrate 100 between the first sealing material 109a and the second sealing material 109b which are bonded together by the sealing material 105 (FIG. 2). (See (A)).
Note that the first light-emitting element 151 a is sealed between the first sealing material 109 a bonded with the sealing material 105 without using the second sealing material 109 b and the substrate 100. Also good.

In the light-emitting module exemplified in this embodiment, a light-emitting element and a terminal electrically connected to the light-emitting element are drawn out, and a first seal that seals the light-emitting element in a bag shape between sealing materials. A stop area is provided. Here, the bag shape refers to a container shape that is a thin and flexible member and isolates the inside from the outside. For example, a first sealing material and a second sealing material that seal a light emitting element. When at least one of the first sealing material and the substrate 100 does not use the second sealing material, the first sealing material and the substrate 100 are flexible. In particular, by using a thin member to seal the light emitting element in a bag shape between the sealing materials, there is an effect of suppressing the thickness when folded.

In addition, since the member that seals the light emitting element in a bag shape between the sealing materials has flexibility, it can also be used for the hinge portion. For example, when at least one of the first sealing material and the second sealing material that seals the light-emitting element has a flexible structure, or when the second sealing material is not used, the first sealing material is used. When at least one of the sealing material and the substrate 100 has a flexible structure, the number of parts can be reduced by using the flexible member for the hinge portion.

In particular, at least one of the first sealing material and the second sealing material that seals the light-emitting element, or at least one of the first sealing material and the substrate 100 when the second sealing material is not used. Further, by adopting a configuration in which a flexible member that can be continuously supplied in the form of a roll or a long sheet is applied to the sealing step, the effect of facilitating continuous production can be achieved.

In the case where the first light-emitting element 151 a extracts light from the side where the first electrode 101 is provided, a material that transmits light emitted from the layer 103 containing a light-emitting organic compound is used as the first electrode 101 and the substrate 100. And used for the second sealing material 109b. In the case where the first light-emitting element 151a extracts light from the side where the second electrode 102 is provided, the layer 10 containing a light-emitting organic compound is used.
3 is used for the second electrode 102 and the first sealing material 109a.

Note that a structure in which a medium that promotes optical connection is filled between the surface on which the first light-emitting element 151a emits light and the sealing material provided on the surface is preferable. For example, the first light emitting element 15
A medium (also referred to as matching oil) having a refractive index approximately equal to the refractive index of the material constituting the light emitting side of 1a, specifically, a medium filled with a medium having a refractive index difference of 0.1 or less. preferable. For example, an optical oil or resin composition having a refractive index of 1.5 to 2.1 can be used. Specifically, oil, grease, silicone oil, or resin in which fine particles having different refractive indexes are dispersed to adjust the refractive index can be used.

A member that isolates the first light-emitting element 151a from the atmosphere (specifically, the sealing material 105, the first sealing material 109a, the second sealing material 109b, or the substrate 100) has a gas barrier property as a water vapor transmission rate. 10 ⁻⁵ g / m ² · day or less, preferably 10 ⁻⁶ g / m ² · day or less is used. For example, a composite material formed by coating a plastic film with an inorganic material can be applied. Further, the first sealing material 109a illustrated in FIG. 2A is flexible because it forms part of the hinge portion 153 described later. In addition, the first light-emitting element 151a may be sealed together with a desiccant.

The terminal 111 is electrically connected to the wiring 111 a via the contact 121, and the terminal 112 is electrically connected to the wiring 112 a via the contact 122.

In the light-emitting panel 150 of this embodiment, the light-emitting module including the first light-emitting element 151 a and the light-emitting module including the second light-emitting element 151 b are bent wiring 1 in the hinge portion 153.
81a is connected in series.

The bent wiring 181a exemplified in this embodiment is formed of a metal plate folded in a spring shape in the bending direction of the hinge portion 153. With such a configuration, the bent wiring 181a follows the bending of the hinge portion 153 without disconnection. As another form of the bent wiring 181a,
Wiring in which metal wires are woven in a mesh shape, or so-called FPC in which a plastic film such as polyimide and a copper foil are bonded can also be applied.

Configuration examples of the hinge portion 153 are shown in FIGS. 2 (A), 2 (B), and 2 (C). A structure of the hinge portion 153 from which the second sealing material 109b is cut is shown in FIG. In this configuration,
It is particularly easy to bend the side where the second sealing material 109b is removed. Further, in the structure illustrated in FIG. 2B, the film is bent to either the second sealing material 109a side or the second sealing material 109b side. Further, FIG. 2C illustrates a structure of the hinge portion 153 from which the first sealing material 109a has been cut. In this configuration, it is particularly easy to bend the side where the first sealing material 109a is removed. By combining these multiple structures in one light-emitting panel,
The part which does not become a valley fold and a crease can also be produced in advance. A light-emitting panel having a configuration in which the folding method is specified in advance is convenient because the user can fold the light-emitting panel according to the light-emitting panel.

<Modification>
Another embodiment of the light-emitting panel of one embodiment of the present invention is described with reference to FIGS. The light emitting panel 250 includes a first light emitting module including the first light emitting element 251a surrounded by the sealing region 252a,
A second light emitting module including the second light emitting element 251b surrounded by the sealing region 252b, a third light emitting module including the second light emitting element 251c surrounded by the sealing region 252c, and a sealing region 252d. And a fourth light emitting module including the second light emitting element 251d surrounded by.

A hinge portion 253 is provided between adjacent light emitting modules. The hinge part 253 is
A region including the first light emitting element 251a and the second light emitting element 251b, and a third light emitting element 251;
c and a region including the fourth light-emitting element 251d can be bent. Alternatively, the light-emitting element can be folded at a fold provided between a region including the first light-emitting element 251a and the third light-emitting element 251c and a region including the second light-emitting element 251b and the fourth light-emitting element 251d. Further, the bent portion 280a and the bent wire 290a for electrically connecting the adjacent light emitting panels to the hinge portion 253, and the bent wire 281a for electrically connecting the common wire.
And a bent wiring 291a are provided.

The light emitting panel 250 exemplified in this modification has an opening 254 at a portion where two creases provided with the hinge portion 253 intersect. With the configuration in which the opening 254 is provided, the two folds can be expanded or folded without applying excessive stress in the vicinity, and unnecessary stress is hardly applied to the sealing region adjacent to the hinge portion. As a result, it is possible to prevent the failure of the sealing region caused by the folding operation from impairing the reliability of the light-emitting panel.

The light emitting panel 250 exemplified in this modification can be cut at the hinge portion 253.
For example, the first light-emitting module including the first light-emitting element 251a can be separated from other portions by a thick broken line illustrated in FIG. This is because the light emitting module included in the light emitting panel 250 includes light emitting elements that are sealed independently from each other, so that the reliability of the light emitting module is not impaired even if the light emitting module is cut at the hinge portion 253 of the adjacent light emitting module. Because.
Note that the bent wiring 280a and the bent wiring 281a provided in the hinge portion are respectively cut and become extraction terminals.

The light-emitting panel exemplified in this embodiment includes a severable hinge portion outside a region for sealing a light-emitting element whose reliability is impaired when exposed to the atmosphere. Thereby, it is possible to excise the light emitting element unit without breaking the sealing region including the light emitting element, and the size of the light emitting panel can be changed.

The light-emitting panel of one embodiment of the present invention includes a hinge portion that can be easily bent between sealing regions including a planar light-emitting element. Thereby, the light emission panel which can be folded between two planar light emitting elements can be provided. Alternatively, the wiring is arranged along the hinge portion. Thereby, stress due to bending is hardly applied to the wiring, and disconnection of the wiring due to bending can be prevented. Alternatively, a flexible wiring is provided in the bent portion. Thereby, the stress by bending can be relieved and the disconnection of the wiring by bending can be prevented.

Note that this embodiment can be combined with any of the other embodiments described in this specification as appropriate.

(Embodiment 2)
In the present embodiment, a plurality of light emitting modules each having a planar light emitting element are connected by a hinge portion,
A light-emitting panel that can be folded will be described with reference to FIGS. Specifically, a light-emitting panel that includes a mountain-folded hinge portion and a valley-folded hinge portion, has a double-wave type developable curved surface, and can be folded by a so-called Miura folding method will be described.

A plan view of the light-emitting panel exemplified in this embodiment is illustrated in FIG. The luminous panel 350 has 6
Light emitting modules are arranged in a matrix of 6 rows and 6 columns. Each light emitting module exemplified in this embodiment has a parallelogram shape, and has a hinge portion between adjacent light emitting modules.

The structure described in Embodiment 1 can be applied to the light-emitting module of the light-emitting panel exemplified in this embodiment. An extraction terminal 380 and an extraction terminal 381 are provided at the end of the light emitting panel 350, and the short ring 3 is connected so that six light emitting modules are connected in series in the row direction.
89 is connected.

Hinge portions that are long in the row direction are straight and are alternately folded by a mountain fold indicated by a thick solid line and a valley fold indicated by a thick broken line. Moreover, the hinge part long in a row direction is zigzag-shaped, and is folded in a mountain fold or a valley fold. In other words, the hinge portion is provided so as to form a double corrugated developable curved surface.

With such a structure, when the light-emitting panel exemplified in this embodiment is folded so that diagonals are close to each other as shown by arrows in FIG. Can be easily folded.

The light-emitting panel of one embodiment of the present invention includes a double corrugated developable curved surface. Thereby, it can fold by the so-called Miura folding method. The light emitting panel folded by the Miura folding method can be expanded or folded without applying excessive stress to the hinge portion and the vicinity thereof, and unnecessary stress is hardly applied to the sealing region adjacent to the hinge portion. As a result, it is possible to prevent the failure of the sealing region caused by the folding operation from impairing the reliability of the light-emitting panel.

Note that this embodiment can be combined with any of the other embodiments described in this specification as appropriate.

(Embodiment 3)
In the present embodiment, a plurality of light emitting modules each having a planar light emitting element are connected by a hinge portion,
A light-emitting panel that can be deformed into a three-dimensional shape by refracting the hinge part, and a three-dimensional lighting fixture formed by refracting the hinge part of the light-emitting panel will be described with reference to FIG. Specifically, a light-emitting triangular cone formed by a light-emitting panel having a mountain-fold hinge portion and a valley-fold hinge portion will be described.

A plan view of the light-emitting panel described in this embodiment is illustrated in FIG. The luminous panel 450 is 3
It has two light emitting modules (480a, 480b and 480c). Each light-emitting module exemplified in this embodiment is an isosceles triangle, and its equilateral sides are in contact with adjacent light-emitting modules, and a hinge portion is provided between the equilateral sides.

The structure described in Embodiment 1 can be applied to the light-emitting module of the light-emitting panel exemplified in this embodiment. An extraction terminal 480 and an extraction terminal 481 are provided at the end of the light emitting panel 450, and a short ring 489 is connected so that three light emitting modules are connected in series.

Since such a structure is provided, the light-emitting panel exemplified in this embodiment can be extremely easily formed into a three-dimensional (triangular pyramid) shape when folded so that diagonals are close to each other as indicated by arrows in FIG. Can be assembled into. The solid body that can emit light exemplified in this embodiment emits light in various directions in spite of the use of a planar light-emitting panel. As a result, a solid (triangular pyramid) excellent in visibility can be provided. Note that the three-dimensional shape (triangular pyramid) described in this embodiment is an example, and various solids can be formed using the light-emitting panel which is one embodiment of the present invention.

The light-emitting panel of one embodiment of the present invention is provided with a hinge portion so that a three-dimensional shape can be formed like origami. In the lighting device of one embodiment of the present invention, the hinge portion of the light-emitting panel is folded to have a three-dimensional shape like origami. As a result, it is possible to take two forms, a planar form and a three-dimensional form. As a result, for example, light emission that is stored in a planar form without being bulky and emits light in various directions in a three-dimensional form. Can provide a panel.

Note that this embodiment can be combined with any of the other embodiments described in this specification as appropriate.

(Embodiment 4)
In this embodiment, an example of a structure of a light-emitting element that can be used for a light-emitting module having a structure in which power is supplied to the light-emitting element from a positive temperature coefficient thermistor that is thermally connected to the light-emitting element is described with reference to FIGS. Explanation will be made with reference to FIG.

The light-emitting element described as an example in this embodiment includes a first electrode, a second electrode, and a layer containing a light-emitting organic compound (hereinafter referred to as an EL layer) between the first electrode and the second electrode. In this embodiment mode, the first electrode formed over the substrate functions as an anode, and the second electrode functions as a cathode. The EL layer is provided between the first electrode and the second electrode, and the structure of the EL layer is the first electrode and the second electrode.
What is necessary is just to select suitably according to the material of this electrode. Although an example of a structure of a light emitting element is illustrated below, it cannot be overemphasized that the structure of a light emitting element is not limited to this.

<Configuration Example 1 of Light-Emitting Element >
An example of a structure of the light-emitting element is illustrated in FIG. A light-emitting element illustrated in FIG.
An EL layer 1103 is sandwiched between the cathode 1102 and the cathode 1102.

When a voltage higher than the threshold voltage of the light emitting element is applied between the anode 1101 and the cathode 1102, E
Holes are injected into the L layer 1103 from the anode 1101 side, and electrons are injected from the cathode 1102 side. The injected electrons and holes are recombined in the EL layer 1103, and the EL layer 1103
The luminescent material contained in the light emits light.

The EL layer 1103 only needs to include a light-emitting layer containing at least a light-emitting substance, and may have a structure in which layers other than the light-emitting layer are stacked. Examples of the layer other than the light emitting layer include a material having a high hole injection property, a material having a high hole transport property, a material having a poor hole transport property (blocking), a material having a high electron transport property, a material having a high electron injection property, and a bipolar. And a layer containing a material (having high transportability of electrons and holes) and the like.

An example of a specific structure of the EL layer 1103 is illustrated in FIG. EL layer 11 shown in FIG.
03 is a hole injection layer 1113, a hole transport layer 1114, a light emitting layer 1115, an electron transport layer 1
116 and the electron injection layer 1117 are laminated in this order from the anode 1101 side.

<Configuration Example 2 of Light-Emitting Element >
Another example of the structure of the light-emitting element is illustrated in FIG. In the light-emitting element illustrated in FIG. 7C, an EL layer 1103 is sandwiched between an anode 1101 and a cathode 1102. Further, an intermediate layer 1104 is provided between the cathode 1102 and the EL layer 1103. Note that the same structure as that of the light-emitting element configuration example 1 can be applied to the EL layer 1103 of the light-emitting element structure example 2.
For details, the description of Structural Example 1 of the light-emitting element can be referred to.

The intermediate layer 1104 may be formed so as to include at least the charge generation region, and may have a structure in which layers other than the charge generation region are stacked. For example, a structure in which the first charge generation region 1104c, the electron relay layer 1104b, and the electron injection buffer 1104a are sequentially stacked from the cathode 1102 side can be used.

The behavior of electrons and holes in the intermediate layer 1104 will be described. Anode 1101 and cathode 11
When a voltage higher than the threshold voltage of the light emitting element is applied during 02, the first charge generation region 110 is applied.
In 4c, holes and electrons are generated, the holes move to the cathode 1102, and the electrons move to the electron relay layer 1104b. The electron relay layer 1104b has a high electron transporting property and quickly transfers electrons generated in the first charge generation region 1104c to the electron injection buffer 1104a. The electron injection buffer 1104a relaxes the barrier for injecting electrons into the EL layer 1103, and the EL layer 1
The electron injection efficiency into 103 is increased. Therefore, the electrons generated in the first charge generation region 1104c pass through the electron relay layer 1104b and the electron injection buffer 1104a, and then pass through the EL layer 1103.
Is injected into the LUMO level.

In addition, the electron relay layer 1104b prevents an interaction such as a substance constituting the first charge generation region 1104c and a substance constituting the electron injection buffer 1104a from reacting at an interface, and the mutual functions being impaired. it can.

<Configuration Example 3 of Light-Emitting Element>>
FIG. 8A illustrates another example of the structure of the light-emitting element. In the light-emitting element illustrated in FIG. 8A, two EL layers are provided between the anode 1101 and the cathode 1102. Further, the EL layer 1103a
An intermediate layer 1104 is provided between the EL layer 1103b and the EL layer 1103b.

Note that the number of EL layers provided between the anode and the cathode is not limited to two. The light-emitting element illustrated in FIG. 8B has a structure in which a plurality of EL layers 1103 are stacked, that is, a so-called stacked element structure. However, for example, in the case where an EL layer 1103 of n (n is a natural number of 2 or more) layer is provided between the anode and the cathode, the m (m is a natural number of 1 or more and (n−1) or less) th EL layer; An intermediate layer 1104 is provided between each of the (m + 1) th EL layers.

The EL layer 1103 of the light-emitting element configuration example 3 can have the same structure as that of the light-emitting element structure example 1 described above, and can be applied to the intermediate layer 1104 of the light-emitting element structure example 3. The same configuration as that of Configuration Example 2 of the light-emitting element described above can be applied. So for details,
The description of Structure Example 1 of the light-emitting element or Structure Example 2 of the light-emitting element can be referred to.

The behavior of electrons and holes in the intermediate layer 1104 provided between the EL layers will be described.
When a voltage higher than the threshold voltage of the light-emitting element is applied between the anode 1101 and the cathode 1102, holes and electrons are generated in the intermediate layer 1104, and the holes are formed on the cathode 1102 side.
The electrons move to the layer, and the electrons move to the EL layer provided on the anode side. The holes injected into the EL layer provided on the cathode side recombine with electrons injected from the cathode side, and the light-emitting substance contained in the EL layer emits light. In addition, electrons injected into the EL layer provided on the anode side recombine with holes injected from the anode side, and a light-emitting substance contained in the EL layer emits light. Therefore, the intermediate layer 1
The holes and electrons generated in 104 are emitted in different EL layers.

Note that when the same structure as the intermediate layer is formed between the EL layers in contact with each other, the EL layers can be provided in contact with each other. Specifically, when a charge generation region is formed on one surface of the EL layer, the charge generation region functions as the first charge generation region of the intermediate layer; therefore, the EL layers may be provided in contact with each other. it can.

Structure Examples 1 to 3 of the light-emitting element can be used in combination with each other. For example,
An intermediate layer can also be provided between the cathode and the EL layer in Structural Example 3 of the light-emitting element.

100 Substrate 101 Electrode 102 Electrode 103 Layer containing Light-Emitting Organic Compound 104 Partition 105 Sealing Material 109a Sealing Material 109b Sealing Material 110 Common Wiring 111 Terminal 111a Wiring 111b Wiring 112 Terminal 112a Wiring 112b Wiring 121 Contact 122 Contact 150 Light Emitting Panel 151a light emitting element 151b light emitting element 151c light emitting element 151d light emitting element 152a sealing region 152b sealing region 153 hinge part 180 terminal 181 terminal 181a bent wiring 189 short ring 250 light emitting panel 251a light emitting element 251b light emitting element 251c light emitting element 251d light emitting element 252a sealing Stop region 252b Sealing region 252c Sealing region 252d Sealing region 253 Hinge portion 254 Opening 280a Bending wire 281a Bending wire 290a Bending wire 291a Bending wire 350 Optical panel 380 Terminal 381 Terminal 389 Short ring 450 Light emitting panel 480 Terminal 481 Terminal 489 Short ring 1101 Anode 1102 Cathode 1103 EL layer 1103a EL layer 1103b EL layer 1104 Intermediate layer 1104a Electron injection buffer 1104b Electron relay layer 1104c Charge generation region 1113 Hole injection Layer 1114 Hole transport layer 1115 Light emitting layer 1116 Electron transport layer 1117 Electron injection layer

Claims (1)

A first sealing region, a second sealing region, and a hinge portion;
The first sealing region has a first sealing material,
The first sealing material has a first flexible member, a second flexible member, and a first sealing material,
The first flexible member is disposed to face the second flexible member,
The first flexible member is fixed to the second flexible member by the first sealing material, and the inside surrounded by the member can be isolated from the outside. ,
The first light-emitting element is included inside the member,
A first terminal that is electrically connected to the first light emitting element is drawn out from the first sealing region,
The second sealing region has a second sealing material,
The second sealing material includes the first flexible member, the third flexible member, and a second sealing material.
The first flexible member is disposed to face the third flexible member;
The first flexible member is fixed to the third flexible member by the second sealing material, and the inside surrounded by the member can be isolated from the outside. ,
A second light emitting element is included inside the member,
A second terminal electrically connected to the second light emitting element is drawn out from the second sealing region,
The hinge portion is provided between the first sealing region and the second sealing region,
The hinge part can be bent,
The hinge portion has a member having the first flexibility,
The hinge part has wiring,
The wiring is electrically connected to the first terminal;
The wiring is electrically connected to the second terminal;
The wiring can be folded,
In the folded wiring, the number of times of folding on the first flexible member side is larger than that on the side opposite to the first flexible member,
Each of the first light-emitting element and the second light-emitting element includes a pair of electrodes and a layer containing a light-emitting organic compound between the pair of electrodes.

Images