JP6939445B2 - Organic electroluminescence device, its manufacturing method and image display device - Google Patents

Description

The present invention relates to an organic electroluminescence device composed of a plurality of organic electroluminescence elements, a method for manufacturing the same, and an image display device including the organic electroluminescence device. The present invention relates to an organic electroluminescence device having improved reduction and emission brightness difference, a manufacturing method of an organic electroluminescence device that can be manufactured at low cost without requiring large equipment as a manufacturing means, and an image display device equipped with the manufacturing method. ..

As one of the display methods for advertising signboards outdoors, large signboards using LEDs (Light Economy Diode) as backlights, night signage that illuminates the entire signboard with an external illuminator, etc. are widely used. It has problems in terms of enormous power consumption and economic efficiency of distribution equipment.

In recent years, an organic electroluminescence element (hereinafter abbreviated as "organic EL element") using an organic material electroluminescence (hereinafter abbreviated as "EL") has rapidly become widespread, and this organic material has become widespread. The EL element is a thin film type completely solid element capable of emitting light at a low voltage of about several V to several tens of V, and has many excellent features such as high brightness, high emission efficiency, thinness, and light weight. For this reason, the fields of application thereof are being energetically studied as surface emitters such as display devices, displays, and illumination light sources.

Further, as described above, as an image display device, there is an increasing demand for a display device using a still image intended for a poster or the like instead of displaying a moving image.

In a multicolor display type organic EL device, red light is most likely to be emitted when a constant voltage is applied due to the difference in drive voltage required by each light emitting element, followed by green light emission. In order to emit blue light, for example, in order to obtain uniform white light emission, it is necessary to control the voltage applied to each organic EL element, and an arbitrary driver such as a TFT (Thin Film Transistor) can be used. It is necessary to emit light with the emission brightness. Therefore, the configuration of the organic EL device becomes complicated, and as a result, the device becomes expensive, and there is a demand for the development of an organic EL device that can be manufactured at low cost with simple drive and configuration. ing.

On the other hand, as a method for manufacturing an organic EL device, a method of manufacturing by a dry forming method using a chemical vapor deposition method, a vacuum vapor deposition method, or the like is known, but most of these dry forming methods are large-scale such as a vacuum device. Since it requires equipment, the cost increases, and it is difficult to manufacture a large-area organic EL element due to the equipment. Further, when the light emitting layers of R, G, and B are formed on the same plane by a side-by-side method using a thin-film deposition method, it is necessary to form light emitting layers having different configurations, and the light emitting layers are formed in a large area. When trying to do so, the shadow mask is vapor-deposited while shifting each pixel, so there is a decisive problem that the shadow mask expands due to radiant heat from the vapor deposition source and the formation position of the light emitting layer is displaced. May occur.

In recent years, in response to the above problems, coating methods capable of realizing energy saving, large area, light weight / thin film, forming accuracy, and applying a flexible base material, for example, offset printing method and gravure printing method. , Screen printing method, inkjet printing method and other wet coating methods are used to manufacture electronic devices, and research on "printed electronics" is being actively conducted.

For example, Patent Document 1 discloses a method of forming a blue light emitting layer, a green light emitting layer, and a red light emitting layer by an inkjet printing method on the same plane of a light emitting layer forming region constituting an organic EL element. However, it is not a configuration in which each light emitting layer is separated, the light emitting separability is insufficient, there is a problem in terms of light emitting uniformity, and no specific description is made regarding the driving method.

Further, Patent Document 2 discloses a method of defining the arrangement of constituent materials of an organic EL element by using a tapered bank, but a method of forming organic EL elements having different emission colors on the same plane is disclosed. Not listed.

Further, Patent Documents 3 and 4 also describe a configuration in which two or more different light emitting layers are arranged on the same plane of the light emitting layer forming region constituting the organic EL element, but the voltage applied to each light emitting layer is also described. Is the same voltage, and the emission uniformity between the organic EL elements is insufficient, and the above problem has not been solved.

Further, Patent Document 5 discloses a configuration in which the anode is composed of a plurality of organic EL elements and the anode is coupled to the drive circuit via an adjustment resistor. According to this method, the adjustment resistance value is set so that the difference between the minimum value and the maximum value of the voltage in each organic EL element falls within a range corresponding to 20% of the maximum value. However, the method described in Patent Document 5 does not describe at all about arranging organic EL elements having different colors on the same plane or applying a wet coating method as a method for forming the same.

That is, in each of the above patent documents, a plurality of organic EL elements having different emission colors are arranged in a completely separated state, and the deterioration of emission quality and the difference in emission brightness due to the difference in applied voltage between the organic EL elements are improved. Regarding the organic electroluminescence device and the manufacturing method of the organic electroluminescence device that can be manufactured with a simple configuration and at low cost, there is no clear description or suggestion, and urgent action is required.

Japanese Patent No. 6122491 International Publication No. 2009/11239 JP-A-2007-273397 Japanese Patent No. 6133301 Japanese Unexamined Patent Publication No. 2001-117525

The present invention has been made in view of the above problems, and the problem to be solved is to manufacture an organic electroluminescence device having a simple configuration and having an improved emission quality and emission brightness difference due to an applied voltage difference. It is an object of the present invention to provide a method for manufacturing an organic electroluminescence device that can be manufactured at low cost without requiring large-scale equipment as a means, and an image display device equipped with the method.

As a result of diligent studies in view of the above problems, the present inventor has at least one pixel unit having two or more organic EL elements having different emission colors on the base material, and serves as the first electrode of the organic EL element. It has a simple configuration by an organic electroluminescence device characterized by having a bus line to which a voltage is applied, a conductive member having a resistance value for adjusting the voltage applied to the organic EL element, and an applied power supply unit. The present invention has been made by finding that it is possible to realize an organic electroluminescence device in which the emission quality is deteriorated due to the applied voltage difference and the emission brightness difference is improved.

That is, the above problem of the present invention is solved by the following means.

1. 1. An organic electroluminescence device having a pixel unit including a plurality of organic electroluminescence elements.
The organic electroluminescence element has at least a first electrode, an organic functional layer including a light emitting layer, and a second electrode on a base material.
The pixel unit has a configuration in which a plurality of the organic electroluminescence elements having different emission colors are arranged on the same surface, and
A single application power supply unit that applies a constant voltage to the entire organic electroluminescence device in a single circuit,
It has a bus line that applies a voltage to each of the first electrodes of the plurality of organic electroluminescence devices.
Since there are places where a conductive member having a resistance value for adjusting the applied voltage is arranged and places where it is not arranged between the applied power supply unit and the organic electroluminescence element, the light emission of each organic electroluminescence element is emitted. An organic electroluminescence device characterized by tuned individual drive.

2. The organic according to a first aspect, wherein two or more conductive members having the resistance value are arranged between the bus line and the first electrode of each of the organic electroluminescence elements. Electroluminescence device.

3. 3. The organic electroluminescence device according to item 1, wherein two or more conductive members having the resistance value are arranged between the bus line and the applied power supply unit.

4. The two or more conductive members connected to the bus line have different resistance values for adjusting so that the difference in voltage applied to the two or more organic electroluminescence elements is within 0.3 V. The organic electroluminescence device according to any one of the items 1 to 3, wherein the organic electroluminescence device is characterized by the above.

5. A first, second or fourth aspect, wherein an insulating layer having an opening is provided on the base material, and at least the organic electroluminescence element or the conductive member is arranged in the opening. The organic electroluminescence device described in the section.

6. The organic according to any one of items 1 to 5, wherein the conductive member contains at least a composite of poly (3,4-ethylenedioxythiophene) and polystyrene sulfonic acid. Electroluminescence device.

7. The organic electroluminescence device according to any one of items 1 to 6, wherein the pixel units are arranged in a plurality of regions surrounded by the bus lines in a grid pattern. ..

8. The organic electroluminescence device according to any one of items 1 to 7, wherein a still image is displayed by the plurality of pixel units.

9. A method for manufacturing an organic electroluminescence device according to any one of paragraphs 1 to 8, wherein the organic electroluminescence device is manufactured.
A method for manufacturing an organic electroluminescence device, which comprises forming a conductive member having at least a resistance value for adjusting a voltage applied to each of the organic electroluminescence elements by a wet coating method.

10. The organic electroluminescence according to Item 9, wherein at least the insulating layer, the organic electroluminescence element, the extraction electrode for the first electrode, the joint portion of the bus line and the bus line are formed by a wet coating method. How to make the device.

11. The method for manufacturing an organic electroluminescence device according to item 9 or 10, wherein the wet coating method is an inkjet printing method.

12. An image display device including the organic electroluminescence device according to any one of items 1 to 8.
An image display device characterized in that a plurality of pixel units including a plurality of organic electroluminescence elements having different emission colors are arranged on the same plane to display an image.

According to the present invention, an organic electroluminescence device having a simple configuration and improved emission quality and emission brightness difference due to an applied voltage difference, and a manufacturing means that does not require large equipment and is manufactured at low cost. It is possible to provide a method for manufacturing an organic electroluminescence device capable of the above, and an image display device including the same.

The technical features of the organic electroluminescence device having the configuration defined in the present invention and the mechanism of manifestation of its effects are presumed as follows.

The organic electroluminescence element is an organic semiconductor, and the voltage required to start light emission differs depending on the emission color. Usually, in order to form an image, it is necessary to drive the pixels individually, and a passive matrix method and an active matrix method are known. However, in either method, a driver for driving is required, and in particular, in the case of the active matrix method, a TFT is required, which makes the configuration expensive.

The present invention is based on the above problems and relates to an organic EL device that forms an image without using an expensive driver.

As described above, when it is attempted to drive pixels of different emission colors with a common electrode, the drive voltage of each pixel is different, so that the pixel emitting light at a lower voltage preferentially emits light, and the desired emission balance is achieved. It was difficult to obtain an image.

In the present invention, a voltage adjusting unit corresponding to the driving voltage of each emission color is provided between the power supply on the anode side and the light emitting unit so that the voltage applied to the entire panel becomes constant regardless of the emission color. This makes it possible to simultaneously light pixels having different emission colors in a single circuit without the need for a driver or TFT.

Schematic layout showing an example of the overall configuration of an organic EL device composed of a plurality of pixel units of the present invention (Embodiment 1). Schematic diagram showing the basic configurations of Embodiment 1 and Embodiment 2, which are typical configurations of the organic EL device of the present invention. Schematic top view showing an example of a pixel unit constituting the organic EL device of the present invention (Embodiment 1) Schematic perspective view showing an example of an insulating layer formed on a base material and two types of openings provided in the insulating layer. Schematic cross-sectional view showing the configuration represented by the cut surface AA'of the pixel unit shown in FIG. Schematic cross-sectional view showing the configuration represented by the cut surface BB'of the pixel unit shown in FIG. Schematic configuration diagram showing an example of a pixel unit constituting the organic EL device represented by the second embodiment of the present invention. Schematic cross-sectional view showing an example of the configuration of an organic EL device applicable to the present invention. Schematic flow diagram No. 1 showing an example of the manufacturing process of the pixel unit (Embodiment 1) represented by FIG. Schematic flow diagram 2 showing an example of the manufacturing process of the pixel unit (Embodiment 1) represented by FIG. Schematic diagram showing an example of an inkjet printing method which is an example of a wet coating method Schematic perspective view and bottom view showing an example of the structure of the inkjet head applicable to the inkjet printing method.

The organic electroluminescence device of the present invention has a pixel unit including a plurality of organic electroluminescence elements, and the organic electroluminescence element has at least a first electrode and an organic functional layer including a light emitting layer on a base material. , The pixel unit has a configuration in which a plurality of the organic electroluminescence elements having different emission colors are arranged on the same surface, and a single circuit is provided in the entire organic electroluminescence device. It has a single applied power supply unit that applies a constant voltage in the above, and a bus line that applies a voltage to the first electrode of each of the plurality of the organic electroluminescence elements, and the applied power supply unit and the organic electroluminescence element. It is characterized by individual driving in which the light emission of each organic electroluminescence element is adjusted by having a place where a conductive member having a resistance value for adjusting the applied voltage is arranged and a place where the conductive member is not arranged. And. This feature is a technical feature common to the inventions according to the following embodiments.

In an embodiment of the present invention, from the viewpoint of further exhibiting the effect intended by the present invention, two or more of the conductive members having the resistance value are a joint portion of one of the bus lines and the organic electroluminescence element. The first embodiment, which is arranged between the extraction electrode of each of the first electrodes, is a preferable configuration in that the deterioration of the emission quality and the occurrence of the emission luminance difference can be further suppressed. ..

Further, by adopting the second embodiment in which two or more conductive members having the resistance value are arranged between the bus line and the applied power supply unit, the light quality can be deteriorated with a simpler configuration. It is preferable in that an organic EL device capable of suppressing the occurrence of a difference in emission brightness can be obtained.

Specifically, the two or more conductive members connected to the bus line are adjusted so that the difference in voltage applied between the two or more organic electroluminescence elements is within 0.3 V. Therefore, it is preferable to have different resistance values in that the difference in emission luminance between a plurality of organic EL elements having different emission colors can be reduced and stable quality can be obtained.

An insulating layer having an opening is provided on the base material, and at least the organic electroluminescence element or the conductive member is arranged in the opening, thereby completely between each organic EL element or between the conductive members. By separating into the above, it is preferable in that short circuits and the like can be effectively prevented and stable driving can be realized.

Further, when the conductive member contains at least a composite of poly (3,4-ethylenedioxythiophene) and polystyrene sulfonic acid, wet coating suitability can be imparted, and a desired resistance value can be obtained by a simple method. It is preferable in that a conductive member can be formed.

Further, it is preferable that the pixel units are arranged in each of a plurality of regions surrounded by the grid-like bus lines in that a high-definition still image can be displayed. ..

Further, the organic EL device of the present invention has a simple drive method and enables uniform and stable light emission of a plurality of emission colors, and is particularly effective in the field of still image display such as outdoor advertisements and posters. Can be applied to.

In the method for manufacturing an organic EL device of the present invention, forming a conductive member having a resistance value for adjusting at least the voltage applied to each of the organic electroluminescence elements by a wet coating method requires a large-scale equipment as a manufacturing means. It can be stably manufactured at low cost.

Further, at least the insulating layer, the organic electroluminescence element, the extraction electrode for the first electrode, the joint portion of the bus line and the bus line shall be formed by a wet coating method, and an inkjet printing method shall be applied as the wet coating method. Is a more preferred embodiment.

Hereinafter, the components of the present invention and the embodiments for carrying out the present invention will be described in detail with reference to the drawings. In the present application, "~" representing a numerical range is used to mean that the numerical values described before and after the numerical range are included as the lower limit value and the upper limit value. In the description of each figure, the numbers in parentheses at the end of the components represent the symbols in each figure.

<< Basic configuration of organic EL device >>
The organic EL device of the present invention has a plurality of organic EL elements having different emission colors having a first electrode, an organic functional layer including a light emitting layer, and a second electrode on a base material, and a plurality of organic EL devices. It is composed of a bus line that applies a voltage to each first electrode of the element, a conductive member having a resistance value that adjusts the voltage applied to each of the organic EL elements, and an applied power supply unit that applies a voltage to the organic EL element. It is characterized by being done.

First, the overall configuration of the organic EL device will be described.

FIG. 1 is a schematic layout diagram (Embodiment 1) showing an example of the overall configuration of an organic EL device composed of a plurality of pixel units of the present invention.

In a preferred embodiment 1 of the organic EL device (20) shown in FIG. 1, a plurality of bus lines V (14V) in the vertical direction and a plurality of bus lines H (14H) in the horizontal direction are arranged in a grid pattern, and each of them is arranged in a grid pattern. A pixel unit (PU) is formed in the block. An applied power supply (18) having a single simple configuration is connected to the bus line, and a voltage under a single condition is applied.

The "bus line" referred to here is a signal line for supplying electric power to each organic EL element from an applied power source, although the details thereof will be described later. Further, the "conductive member" is a conductive material whose resistance value can be adjusted, has different resistance values, and has a function of adjusting the applied voltage to each organic EL element.

The first to fourth columns of rows A and D have, for example, three organic EL elements (EL _R , EL _G , EL _B ) having the same configuration as the pixel unit (PU) shown in FIG. 3, which will be described later. It is a group of pixel units (PUs) that mainly display white light emission, with a configuration in which conductive members (16R, 16G, 16B) are arranged between each organic EL element and a bus line.

On the other hand, by not forming the conductive members (16R, 16G, 16B), it is possible to display each emission color. In the B row-1 column, only the red light emitting organic EL element is provided with a conductive member (16R) to emit red light, and similarly, the B row-2nd column emits green light and the B row-3rd column emits blue light.

In the C row-1st column, only the red light emitting organic EL element series is formed to emit cyan light, and similarly, the C row-2nd column emits magenta light, and the C row-3rd column is yellow. Make it emit light. Further, by removing all the conductive members (16R, 16G, 16B), black display is performed. In the machine EL device (20) of the present invention, application to the display field of still images is effective, and it is preferable to have the above configuration.

FIG. 2 is a schematic view showing a basic configuration of an organic EL element series constituting the first embodiment and the second embodiment, which are typical configurations of the organic EL device of the present invention.

In the first preferred embodiment, the pixel unit (PU) is arranged in each of a plurality of regions surrounded by the grid-like bus lines (14).

The configuration shown in FIG. 2A is a configuration in which the pixel unit (PU) constituting the organic EL device includes one organic EL element, for example, the red light emitting organic EL element (EL _R ) shown in FIG. A conductive member (16) having a specific resistance value is arranged between the bus line (14) and the extraction electrode (17) of each first electrode of the organic EL element (EL). It is a configuration that is.

In the second preferred embodiment, as shown in FIG. 2B, the conductive member (16) having a specific resistance value according to the present invention is formed on the organic EL element (EL). It is configured to be arranged between the bus line (14) and the applied power supply unit (18). FIG. 2B also shows one series configuration including an organic EL element, for example, as shown in FIG. 7 described later.

Next, the detailed configuration of each organic EL device represented by the first and second embodiments according to the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 3 is a schematic top view showing an example of a specific configuration of the first embodiment of the pixel unit constituting the organic EL device of the present invention.

FIG. 3 shows the configuration of one pixel unit (PU) constituting the organic EL device.

As shown in FIG. 3, the organic EL device represented by the first embodiment of the present invention has a bus line V (14V) arranged in the vertical direction and a bus line V (14V) arranged in the horizontal direction on a base material (not shown). A pixel unit (PU) is formed in a region formed by intersecting the bus lines H (14H) formed in a grid pattern.

The layer unit (PU) includes at least a plurality of organic EL elements (ELs) having different emission colors, in FIG. 3, an organic EL element (EL _R ) that emits red light, an organic EL element (EL _G ) that emits green light, and blue light emission. Three organic EL elements (ELB) of the above are arranged on the same plane. The organic functional layer unit excluding the first electrode of each of these organic EL elements is formed on the entire surface of each opening (11A, 11B, 11C) with the same area.

The first electrode (2) constituting each organic EL element (EL _R , EL _G , EL _B ) is formed by extending the extraction electrode (17) of the first electrode from one end thereof. One end of the lead-out electrode (17) of one electrode is connected at the lower part of the conductive member (16R, 16G, 16B) having a resistance value. A detailed configuration will be described with reference to FIG.

Each of the conductive members (16R, 16G, 16B) is optimally connected to the applied power supply (18) from a single bus line V (14V) to which a constant voltage is applied via the bus line H. _{Each organic EL element (EL R} , EL _G , EL _B ) having a different voltage for obtaining light emission has a function of applying an optimum voltage, and each conductive member is individually used to adjust the applied voltage. It has a resistance value. A specific connection structure between the conductive member and the bus line will also be described with reference to FIG. 5 described later.

The resistance value given to each conductive member varies depending on the characteristics of the organic EL element and the light emitting area, but is generally in the range of 1 to 500 Ω, preferably in the range of 2 to 300 Ω, and more preferably in the range of 5 to 150 Ω. Is within the range of.

On the other hand, the bus line H (14H) arranged in the lateral direction and the conductive members (16R, 16G, 16B) having different resistance values are connected in the configuration as shown in FIG.

On the insulating layer (13) surface formed on the base material (not shown), as two open portions, an opening _{for forming an organic EL element (EL R} , EL _G , EL _B ) is formed. (11A, 11B, 11C) and openings (12A, 12B, 12C) for forming conductive members (12A, 12B, 12C) for forming each conductive member (16R, 16G, 16B) are provided. In FIG. 3, the description of the second electrode is omitted.

FIG. 4 is a schematic perspective view showing an example of an insulating layer formed on the base material and two types of openings (11, 12) formed on the surface of the insulating layer.

One opening is an opening (11) for forming an organic EL element in which each organic EL element (EL _R , EL _G , EL _{B) is arranged on the entire surface thereof.}

The other opening is an opening (12) for forming a conductive member for arranging the conductive members (16R, 16G, 16B) on the entire surface.

In the method of forming each opening as shown in FIG. 4, a bus line (14), a first electrode (2), a lead electrode (17) thereof, and the like are formed on the base material (1), and then an organic EL element is formed. The insulating layer (13) is formed in addition to the forming opening (11) and the region for forming the conductive member forming opening (12). Details will be shown in FIGS. 9 and 10 described later.

Through the openings (11 and 12), the organic functional unit (U) of the organic EL element (EL) and the conductive member (16) are formed by, for example, a wet coating method.

In the method of forming an organic EL device using a wet coating method, for example, an inkjet printing method, it is not necessary to form each constituent portion through a mask or the like, and the opening is placed at a predetermined position with high accuracy and convenience. It can be formed by various devices.

As described above, the feature of the first embodiment of the organic EL device of the present invention is that the pixel units are arranged in a plurality of regions surrounded by the grid-like bus lines arranged in the vertical and horizontal directions, and the resistance value is changed. Is arranged between the bus line and the extraction electrode of the first electrode of the organic EL element. Then, a voltage is applied from a common bus line, and then the voltage applied to each organic EL element is adjusted. By controlling the light emitting conditions of each organic EL element with conductive members having different resistance values, the TFT or the like can be used. This is a method of controlling light emission by a simple method without requiring complicated light emission control. In the organic EL device of the present invention, the light emission in each pixel unit is not a variable light emission method for displaying a moving image or the like, but mainly targets a still image represented by a poster or the like. Since it can be manufactured by a simple control method and a wet coating method that does not require large equipment, it can be manufactured at low cost.

Next, the specific configuration of the organic EL device represented by the first embodiment will be described.

FIG. 5 is a schematic cross-sectional view showing the configuration of the pixel unit (PU) shown in FIG. 3 on the cut surface AA', between the two bus lines (14H) provided on the base material (1). An example of the first embodiment forming one pixel unit (PU) is shown.

Although the detailed manufacturing flow will be described later, as shown in FIG. 5, two bus lines H (14H) are formed in the lateral direction on the base material (1).

Further, in the light emitting region (LA) of the organic EL element, a first electrode (2), an organic functional layer unit (U), and a second electrode (6) for the organic EL element are formed.

Further, as shown in FIG. 5, the insulating layers (13A, 13B, 13C) are formed on the base material (1) except for the opening (11) for forming the organic EL element and the opening (12) for forming the conductive member. ) Is formed.

As a specific configuration of the organic EL element, the first electrode (2) is formed so as to enter the insulating layer (13A) through the opening (11) for forming the organic EL element on the side having the bus line H (14H). Is formed so that the end portion of the first electrode is not exposed to the opening (11) for forming the organic EL element. Further, on the other side of the first electrode, the extraction electrode (17) of the first electrode is extended, and the end portion thereof is exposed to the opening (12) for forming the conductive member.

An organic functional layer unit (U) including a light emitting layer is formed on the entire surface of the opening (11) for forming an organic EL element. On the other hand, the opening (12) for forming the conductive member is configured to cover and connect the end of the extraction electrode (17) of the first electrode and the end of the bus line H (14H) to obtain a desired resistance value. The conductive member (16) to have is formed on the entire surface.

The upper portion of the conductive member forming opening (12) on which the conductive member (16) is formed is an insulating layer for preventing a short circuit between the second electrode (7, cathode) and the conductive member (16) formed thereafter. (13D) is provided.

A second electrode (7, cathode) is formed on the entire surface of the opening (11) for forming an organic EL element and the opening (12) for forming a conductive member, and is sealed so as to cover the entire surface. An adhesive layer (7) for use and a sealing substrate (8) are provided on the outermost surface to form an organic EL device (20).

In such a configuration, the region in which all of the first electrode (2), the organic functional layer unit (U), and the second electrode (7) are present is the light emitting area (LA).

FIG. 6 is a schematic cross-sectional view showing the configuration of the pixel unit shown in FIG. 3 on the cut surface BB', in which three organic EL elements are arranged on the same plane on the base material (1). A configuration example of 1 is shown.

In FIG. 6, three organic EL element forming openings (11A, 11BB, 11C) are formed between a pair of vertical bus lines V (14V) coated on the base material (1) with an insulating layer (13). ), A red light emitting organic EL element (EL _R ), a green light emitting organic EL element (EL _G ), and a blue light emitting organic EL element (EL _B ) are formed in the entire area of each organic EL element forming opening. An insulating layer (13, also referred to as a bank) is provided between each organic EL element to separate the formation region of each organic EL element. At this time, as in FIG. 7, each first electrode (2) is formed to be wider than the opening for forming the organic EL element, and its end portion is located in the insulating layer (13).

A common second electrode (6, cathode) is formed on these organic EL element forming openings (11A, 11BB, 11C), and a common second electrode (6, cathode) is formed on the upper portion thereof, and the entire area is covered with the sealing adhesion. A layer (7) and a sealing substrate (8) are provided on the outermost surface to form an organic EL device (20).

(Embodiment 2)
As the second embodiment of the organic EL device of the present invention, a configuration in which a conductive member having a resistance value is arranged between a bus line and an applied power supply unit can be mentioned.

FIG. 7 is a schematic side view showing an example of a pixel unit constituting the organic EL device represented by the second embodiment of the present invention.

As shown in FIG. 7, a bus line (14) is formed in contact with the entire surface of the first electrode of _{each organic EL element (EL R} , EL _G , EL _{B), and an end portion of each bus line (14) is formed.} Is connected to the conductive members (16R, 16G, 16B), and a voltage is supplied to each conductive member (16R, 16G, 16B) from the applied power supply (18). Similar to the first embodiment, the voltage of a single condition supplied from the applied power source is adjusted to the optimum voltage of each organic EL element via the conductive members having different resistance values, and the voltage is adjusted via the bus line. It is a method of supplying.

Other incidental conditions can be applied by appropriately selecting the method described in the first embodiment.

<< Constituent materials for organic EL devices >>
Next, the details of each component of the organic EL device described above will be described.

[Basic configuration of organic EL element]
First, the basic configuration of the organic EL element will be described with reference to the drawings.

FIG. 8 is a schematic cross-sectional view showing a basic configuration including an organic functional layer unit of an organic EL element applicable to the present invention.

The organic EL element (EL) according to the present invention shown in FIG. 8 has a first electrode (2) and a light emitting layer on a light-transmitting base material (1), for example, a glass base material or a flexible resin base material. The configuration of the organic functional layer unit (U), the second electrode (6), and the like having a structure in which (4) and the two organic functional layer groups (3 and 5) are laminated is shown.

In FIG. 8, an anode (2) is formed as a first electrode in a light emitting area (LA) on a light-transmitting base material (1). One end of the first electrode (2) is formed inside the insulating layer as shown in FIG. On the other side, the first electrode (2) is extended to form the extraction electrode (17) of the first electrode. This light emitting area (LA) is the same area as the opening (11) for forming an organic EL element.

On the other hand, in the entire region of the opening (11) for forming an organic EL element above the anode (2), for example, the first organic functional layer group 1 (11) composed of a hole injection layer, a hole transport layer, and the like. 3), the light emitting layer (4), and the second organic functional layer group 2 (5) composed of, for example, an electron transport layer, an electron injection layer, and the like are laminated to form an organic functional layer unit (U). ing.

A cathode (6) is provided over the entire surface of the upper surface region including the organic functional layer unit (U) as a second electrode. Then, in a structure that covers the entire laminate, an adhesive layer (7) for sealing and a sealing substrate (8) are provided to form an organic EL element (EL).

As shown in FIG. 8, the light emitting area (LA) in the organic EL element (EL) includes an anode (2) which is a first electrode, an organic functional layer unit (U), and particularly a light emitting layer (4). A region in which all of the cathodes (6), which are the second electrodes, are on the same plane.

[Components of organic EL element]
First, details of each component of the organic EL element constituting the organic EL device of the present invention will be described.

First, an example of the configuration of the organic EL element (EL) applicable to the present invention will be shown, but the present invention is not limited to these configurations. The numbers in parentheses correspond to the symbols of the respective components of the organic EL element shown in FIG.

(I) First electrode (2, anode) / light emitting layer (4) / second electrode (6, cathode)
(Ii) First electrode (2, anode) / organic functional layer unit (U) [organic functional layer group 1 (3, hole injection transport layer) / light emitting layer (4) / organic functional layer group 2 (5)] / 2nd electrode (6, cathode)
(Iii) First electrode (2, anode) / organic functional layer unit (U) [organic functional layer group 1 (3, hole injection layer / hole transport layer) / light emitting layer (4) / organic functional layer group 2 (5, electron transport layer / electron injection layer)] / 2nd electrode (6, cathode)
(Iv) First electrode (2, anode) / organic functional layer unit (U) [organic functional layer group 1 (3, hole injection layer / hole transport layer / electron blocking layer) / light emitting layer (4) / organic Functional layer group 2 (5, hole blocking layer / electron transport layer / electron injection layer)] / 2nd electrode (6, cathode)
Regarding the outline of the organic EL element applicable to the present invention, for example, Japanese Patent Application Laid-Open No. 2013-157634, Japanese Patent Application Laid-Open No. 2013-168552, Japanese Patent Application Laid-Open No. 2013-177361, Japanese Patent Application Laid-Open No. 2013-187211, JP-A-2013 2013-191644, 2013-191804, 2013-225678, 2013-235994, 2013-243234, 2013-243236, 2013-2013 242366, 2013-243371, 2013-245179, 2014-003249, 2014-003299, 2014-013910, 2014-017493 Examples thereof include the configurations described in Japanese Patent Application Laid-Open No. 2014-017494.

Specific examples of the tandem type organic EL element include, for example, US Pat. No. 6,337,492, US Pat. No. 7,420,203, US Pat. No. 7,473,923, US Pat. No. 6,872,472, US Pat. No. 6107734, US Pat. No. 6,337,492, Japanese Patent Application Laid-Open No. 2006-228712, Japanese Patent Application Laid-Open No. 2006-24791, Japanese Patent Application Laid-Open No. 2006-49393, Japanese Patent Application Laid-Open No. 2006-49394, Japanese Patent Application Laid-Open No. 2006- 49396, 2011-96679, 2005-340187, 47112424, 349661, 3884564, 4213169, 2010-192719 Japanese Patent Application Laid-Open No. 2009-07629, Japanese Patent Application Laid-Open No. 2008-0784414, Japanese Patent Application Laid-Open No. 2007-059848, Japanese Patent Application Laid-Open No. 2003-272860, Japanese Patent Application Laid-Open No. 2003-045676, International Publication No. 2005/009087, Examples thereof include the element configurations and constituent materials described in International Publication No. 2005/094130, but the present invention is not limited thereto.

Further, each layer constituting the organic EL element will be described.

〔Base material〕
The base material (1) applicable to the organic EL element (EL) is not particularly limited, and examples thereof include types such as glass and resin base materials, preferably imparting flexibility to the organic EL element. It is a flexible resin base material from the viewpoint of being able to be used.

Examples of the resin material constituting the flexible resin base material applicable to the present invention include polyesters such as polyethylene terephthalate (abbreviation: PET) and polyethylene naphthalate (abbreviation: PEN), polyethylene, polypropylene, cellophane, and the like. Cellulous esters such as cellulose diacetate, cellulose triacetate (abbreviation: TAC), cellulose acetate butyrate, cellulose acetate propionate (abbreviation: CAP), cellulose acetate phthalate, cellulose nitrate and their derivatives, polyvinylidene chloride, polyvinyl chloride. Alcohol, polyethylene vinyl alcohol, syndiotactic polystyrene, polycarbonate (abbreviation: PC), norbornene resin, polymethylpentene, polyether ketone, polyimide, polyethersulfone (abbreviation: PES), polyphenylene sulfide, polysulfones, polyetherimide, Polyether ketoneimide, polyamide, fluororesin, nylon, polymethylmethacrylate, acrylic and polyarylates, cycloolefin resins such as arton (trade name, manufactured by JSR) and Apel (trade name, manufactured by Mitsui Chemicals). Can be mentioned.

Among these resin substrates, films such as polyethylene terephthalate (abbreviation: PET), polybutylene terephthalate, polyethylene naphthalate (abbreviation: PEN), and polycarbonate (abbreviation: PC) are flexible in terms of cost and availability. It is preferably used as a resin base material having.

Further, the resin base material may be an unstretched film or a stretched film.

The resin base material applicable to the present invention can be produced by a conventionally known general film-forming method. For example, an unstretched resin base material that is substantially amorphous and not oriented can be produced by heating and melting a resin material as a material with an extruder, extruding it with an annular die or a T die, and quenching it. .. Further, the transport direction (vertical axis direction) of the resin base material is obtained by a known method such as uniaxial stretching, tenter type sequential biaxial stretching, tenter type simultaneous biaxial stretching, and tubular simultaneous biaxial stretching of the unstretched resin base material. , MD direction), or in a direction perpendicular to the transport direction of the resin base material (horizontal axis direction, TD direction), the stretched resin base material can be manufactured. In this case, the draw ratio can be appropriately selected according to the resin used as the raw material of the resin base material, but is preferably in the range of 2 to 10 times in the vertical axis direction and the horizontal axis direction, respectively.

The thickness of the resin base material is preferably a thin film resin base material in the range of 3 to 200 μm, more preferably in the range of 10 to 150 μm, and particularly preferably in the range of 20 to 120 μm. Is.

Examples of the glass substrate which is a light-transmitting substrate applicable to the present invention include soda-lime glass, barium-strontium-containing glass, lead glass, aluminosilicate glass, borosilicate glass, and barium borosilicate glass. , Glass and the like.

[First electrode: anode]
The first electrode (hereinafter, also referred to as an anode) constituting the organic EL element is preferably formed of an oxide semiconductor or a thin metal or alloy, and is, for example, a metal or metal such as Ag or Au. Examples thereof include an alloy containing the above as a main component, CuI, or an oxide semiconductor such as an _{indium tin composite oxide (ITO), SnO 2 and ZnO.}

When the anode is composed of silver as a main component, the purity of silver is preferably 99% or more. Further, palladium (Pd), copper (Cu), gold (Au) and the like may be added to ensure the stability of silver.

When the anode is composed of silver as a main component, it may be formed of silver alone or may be composed of an alloy containing silver (Ag). Examples of such alloys include silver / magnesium (Ag / Mg), silver / copper (Ag / Cu), silver / palladium (Ag / Pd), silver / palladium / copper (Ag / Pd / Cu), and silver. -Indium (Ag / In) and the like can be mentioned.

Among the constituent materials constituting the anode, the anode constituting the organic EL device according to the present invention is composed mainly of indium-tin composite oxide (ITO) or silver and has a thickness of 2 to 20 nm. It is preferable that the anode has a light transmittance within the range of, and more preferably the thickness is within the range of 4 to 12 nm. When the thickness is 20 nm or less, the absorption component and the reflection component of the anode having light transmittance are suppressed to a low level, and a high light transmittance is maintained, which is preferable.

The layer composed mainly of indium-tin oxide composite oxide (ITO) or silver in the present invention means that the content of ITO or silver in the anode is 60% by mass or more, preferably. It is 80% by mass or more, more preferably 90% by mass or more, and particularly preferably the content of ITO or silver is 98% by mass or more. Further, the "light transmittance" of the light-transmitting anode according to the present invention means that the light transmittance at a wavelength of 550 nm is 50% or more.

The light-transmitting anode may have a structure in which layers composed of ITO or silver as a main component are divided into a plurality of layers and laminated, if necessary.

Further, in the present invention, when the anode is a light-transmitting anode composed of silver as a main component, the lower part thereof is formed from the viewpoint of enhancing the uniformity of the silver film of the light-transmitting anode. Can be provided with an anode layer. The base layer is not particularly limited, but is preferably a layer containing an organic compound having a nitrogen atom or a sulfur atom, and a method of forming a light-transmitting anode on the base layer is preferable. be.

Further, the extraction electrode (17) of the first electrode according to the present invention is formed of the same material in the form of extending the first electrode. In the present invention, the distinction between the first electrode (2) and the extraction electrode (17) is that the electrode constituting the light emitting region is defined as the first electrode (2), and the other electrode is connected to the conductive member (16). The electrode is defined as the extraction electrode (17).

[Light emitting layer]
A phosphorescent compound or a fluorescent compound can be used as the light emitting material in the light emitting layer (4) constituting the organic EL element (EL), but in the present invention, phosphorescence is particularly used as the light emitting material. A configuration containing a luminescent compound is preferable.

This light emitting layer is a layer in which electrons injected from the electrode or the electron transport layer and holes injected from the hole transport layer recombine to emit light, and the light emitting portion is in the layer of the light emitting layer. It may be the interface between the light emitting layer and the adjacent layer.

The configuration of such a light emitting layer is not particularly limited as long as the contained light emitting material satisfies the light emitting requirements.

The total thickness of the light emitting layer is preferably in the range of 1 to 100 nm, and more preferably in the range of 1 to 30 nm because a lower driving voltage can be obtained. The total thickness of the light emitting layer is the thickness including the non-light emitting intermediate layer when there is a non-light emitting intermediate layer between the light emitting layers.

Further, as the light emitting layer, a plurality of light emitting materials may be mixed, or a phosphorescent light emitting material and a fluorescent light emitting material (also referred to as a fluorescent dopant or a fluorescent compound) may be mixed and used in the same light emitting layer. It is preferable that the light emitting layer contains a host compound (also referred to as a light emitting host or the like) and a light emitting material (also referred to as a light emitting dopant) and emits light from the light emitting material.

The light emitting layer as described above can be obtained by using a light emitting material or a host compound described later, for example, a vacuum deposition method, a spin coating method, a casting method, a clavier coating method, an LB method (Langmuir Blodgett method) and an inkjet printing method. However, in the present invention, it is preferably formed by a wet coating method such as a pin coating method, a casting method, a Clavier coating method, or an inkjet printing method, and in particular, it is formed by an inkjet printing method. It is preferable to do so.

<Host compound>
As the host compound contained in the light emitting layer, a compound having a phosphorescent quantum yield of phosphorescent emission at room temperature (25 ° C.) of less than 0.1 is preferable. Further, the phosphorus photon yield is preferably less than 0.01. Further, among the compounds contained in the light emitting layer, the volume ratio in the layer is preferably 50% or more.

As the host compound, a known host compound may be used alone, or a plurality of types of host compounds may be used. By using a plurality of types of host compounds, it is possible to adjust the movement of electric charges, and it is possible to improve the efficiency of the organic electroluminescent device. Further, by using a plurality of types of light emitting materials described later, it is possible to mix different light emitting materials, whereby an arbitrary light emitting color can be obtained.

The host compound used in the light emitting layer may be a conventionally known low molecular weight compound or a high molecular weight compound having a repeating unit, and a low molecular weight compound having a polymerizable group such as a vinyl group or an epoxy group (deposited polymerizable light emitting host). ) May be used.

Examples of the host compound applicable to the present invention include Japanese Patent Application Laid-Open No. 2001-257076, Japanese Patent Application Laid-Open No. 2001-357977, Japanese Patent Application Laid-Open No. 2002-8860, Japanese Patent Application Laid-Open No. 2002-43056, Japanese Patent Application Laid-Open No. 2002-105445, and Japanese Patent Application Laid-Open No. 2002-352957, 2002-231453, 2002-234888, 2002-260861, 2002-305083, US Patent Application Publication No. 2005/0112407, US Patent Application Publication 2009/0030202, International Publication No. 2001/039234, International Publication No. 2008/056746, International Publication No. 2005/089025, International Publication No. 2007/0637554, International Publication No. 2005/030900, International Publication No. Examples of the compounds described in No. 2009/086028, International Publication No. 2012/023947, Japanese Patent Application Laid-Open No. 2007-254297, European Patent No. 2034538 and the like can be mentioned.

<Luminescent material>
Examples of the light emitting material that can be used in the present invention include a phosphorescent compound (also referred to as a phosphorescent compound, a phosphorescent material or a phosphorescent dopant) and a phosphorescent compound (also referred to as a phosphorescent compound or a phosphorescent material). However, it is particularly preferable to use a phosphorescent compound from the viewpoint of obtaining high light emission efficiency.

<1> Phosphorescent compound A phosphorescent compound is a compound in which light emission from an excited triple term is observed, specifically, a compound that emits phosphorescent light at room temperature (25 ° C.), and is a phosphorescent quantum. A compound having a yield of 0.01 or more at 25 ° C. is defined as a compound having a preferable phosphorescence quantum yield of 0.1 or more.

The phosphorus photon yield can be measured by the method described on page 398 (1992 edition, Maruzen) of Spectroscopy II of the 4th edition Experimental Chemistry Course 7. The phosphorescence quantum yield in a solution can be measured using various solvents, but when the phosphorescence luminescent compound is used in the present invention, the phosphorescence quantum yield in any of the solvents is 0.01 or more. Should be achieved.

The phosphorescent compound can be appropriately selected from known compounds used in the light emitting layer of a general organic EL element, and preferably contains a metal of Group 8 to 10 in the periodic table of the element. It is a complex-based compound, more preferably an iridium compound, an osmium compound, a platinum compound (platinum complex-based compound) or a rare earth complex, and the most preferable is an iridium compound.

In the present invention, at least one light emitting layer may contain two or more kinds of phosphorescent compounds, and the concentration ratio of the phosphorescent compounds in the light emitting layer changes in the thickness direction of the light emitting layer. It may be in the above mode.

Specific examples of known phosphorescent compounds that can be used in the present invention include compounds described in the following documents.

Nature 395, 151 (1998), Apple. Phys. Lett. 78, 1622 (2001), Adv. Mater. 19,739 (2007), Chem. Mater. 17, 3532 (2005), Adv. Mater. 17,1059 (2005), International Publication No. 2009/100991, International Publication No. 2008/101842, International Publication No. 2003/040257, US Patent Application Publication No. 2006/835469, US Patent Application Publication No. 2006 / Examples thereof include the compounds described in US Patent Application Publication No. 0202194, US Patent Application Publication No. 2007/0087321, US Patent Application Publication No. 2005/0244673, and the like.

In addition, Inorg. Chem. 40,1704 (2001), Chem. Mater. 16,2480 (2004), Adv. Mater. 16, 2003 (2004), Angew. Chem. Int. Ed. 2006, 45, 7800, Apple. Phys. Lett. 86,153505 (2005), Chem. Lett. 34,592 (2005), Chem. Commun. 2906 (2005), Inorg. Chem. 42,1248 (2003), International Publication No. 2009/050290, International Publication No. 2009/000673, US Patent No. 73322232, US Patent Application Publication No. 2009/00397776, US Patent No. 6687266, USA Patent Application Publication No. 2006/0008670, US Patent Application Publication No. 2008/0015355, US Patent No. 7396598, US Patent Application Publication No. 2003/01386657, US Patent No. 70090928 Etc. can be mentioned.

In addition, Angew. Chem. lnt. Ed. 47, 1 (2008), Chem. Mater. 18,5119 (2006), Inorg. Chem. 46,4308 (2007), Organometallics 23,3745 (2004), Apple. Phys. Lett. 74,1361 (1999), International Publication No. 2006/056418, International Publication No. 2005/123873, International Publication No. 2006/082742, US Patent Application Publication No. 2005/0260441, US Patent No. 7534505 , US Patent Application Publication No. 2007/0190359, US Patent No. 7338722, US Patent No. 7279704, US Patent Application Publication No. 2006/103874, and the like. ..

Furthermore, International Publication No. 2005/076380, International Publication No. 2008/140115, International Publication No. 2011/134013, International Publication No. 2010/086089, International Publication No. 2012/20327, International Publication No. 2011/051404 , International Publication No. 2011/073149, JP-A-2009-114086, JP-A-2003-81988, JP-A-2002-363552, and the like.

In the present invention, preferred phosphorescent compounds include organometallic complexes having Ir as the central metal. More preferably, a complex containing at least one coordination mode of metal-carbon bond, metal-nitrogen bond, metal-oxygen bond and metal-sulfur bond is preferable.

The phosphorescent compounds described above are described, for example, in Organic Letters, vol3, No. 16, 2579-2581 (2001), Inorganic Chemistry, Vol. 30, No. 8, pp. 1685-1687 (1991), J. Mol. Am. Chem. Soc. , 123, 4304 (2001), Inorganic Chemistry, 40, 7, 1704-1711 (2001), Inorganic Chemistry, 41, 12, 3055-3066 (2002). , New Journal of Chemistry. , Vol. 26, p. 1171 (2002), European Journal of
It can be synthesized by applying the methods disclosed in Organic Chemistry, Vol. 4, pp. 695-709 (2004), and the references described in these documents.

<2> Fluorescent luminescent compounds Fluorescent luminescent compounds include coumarin dyes, pyran dyes, cyanine dyes, croconium dyes, squalium dyes, oxobenzanthracene dyes, fluorescein dyes, rhodamine dyes, and pyrylium dyes. Examples thereof include dyes, perylene dyes, fluorescein dyes, polythiophene dyes, rare earth complex phosphors and the like.

[Organic functional group excluding light emitting layer]
Next, as a representative example of each layer constituting the organic functional layer group excluding the light emitting layer, the configuration will be described in the order of the charge injection layer, the hole transport layer, the electron transport layer, and the blocking layer.

(Charge injection layer)
The charge injection layer is a layer provided between the electrode and the light emitting layer in order to reduce the driving voltage and improve the light emitting brightness. The details are described in Chapter 2 "Electrode Materials" (pages 123 to 166) of Volume 2 of "S Co., Ltd.", and there are a hole injection layer and an electron injection layer.

Generally, the charge injection layer is present between the anode and the light emitting layer or the hole transport layer in the case of the hole injection layer, and between the cathode and the light emitting layer or the electron transport layer in the case of the electron injection layer. However, the present invention is characterized in that the charge injection layer is arranged adjacent to the electrode having light transmission. When used as an intermediate electrode, at least one of the adjacent electron injection layer and hole injection layer may satisfy the requirements of the present invention.

The hole injection layer is a layer that is arranged adjacent to the anode, which is one of the electrodes, in order to reduce the driving voltage and improve the emission brightness. It is described in detail in Chapter 2 "Electrode Materials" (pages 123-166) of Volume 2 of "NTS".

The details of the hole injection layer are also described in JP-A-9-45479, 9-2660062, 8-288609, etc., and examples of the material used for the hole injection layer include , Porphyrin derivative, phthalocyanine derivative, oxazole derivative, oxadiazole derivative, triazole derivative, imidazole derivative, pyrazoline derivative, pyrazolone derivative, phenylenediamine derivative, hydrazone derivative, stillben derivative, polyarylalkane derivative, triarylamine derivative, carbazole derivative, Indrocarbazole derivatives, isoindole derivatives, acene derivatives such as anthracene and naphthalene, fluorene derivatives, fluorenone derivatives, and polymer materials or oligomers with polyvinylcarbazole and aromatic amines introduced into the main and side chains, polysilanes, and conductivity. Examples thereof include polymers or oligomers (for example, PEDOT (polyethylene dioxythiophene): PSS (polystyrene sulfonic acid), aniline-based copolymers, polyaniline, polythiophene, etc.).

Examples of the triarylamine derivative include a benzidine type represented by 4,4'-bis [N- (1-naphthyl) -N-phenylamino] biphenyl (abbreviation: α-NPD), and 4,4', 4 ". -Tris [N- (3-methylphenyl) -N-phenylamino] triphenylamine) (abbreviation: MTDATA) typified by starburst type, triarylamine compound having fluorene or anthracene in the linking core, etc. Be done.

Hexaazatriphenylene derivatives as described in JP-A-2003-591432 and JP-A-2006-135145 can also be used as the hole transport material in the same manner.

The electron injection layer is a layer provided between the cathode and the light emitting layer in order to reduce the driving voltage and improve the emission brightness, and when the cathode is composed of the light-transmitting electrode according to the present invention. Is provided adjacent to the light-transmitting electrode, and is provided in "Organic EL Element and Its Industrial Frontline (November 30, 1998, published by NTS Co., Ltd.)", Volume 2, Chapter 2, " It is described in detail in "Electrode Material" (pages 123-166).

The details of the electron-injected layer are also described in JP-A-6-325871, JP-A-9-17574, JP-A-10-74586, and the like, and specific examples of materials preferably used for the electron-injected layer include , Metals typified by strontium, aluminum, etc., alkali metal compounds typified by lithium fluoride, sodium fluoride, potassium fluoride, etc., alkali metal halide layers typified by magnesium fluoride, calcium fluoride, etc., fluoride Examples thereof include an alkaline earth metal compound layer typified by magnesium, a metal oxide typified by molybdenum oxide and aluminum oxide, and a metal complex typified by lithium 8-hydroxyquinolate (Liq). When the light-transmitting electrode in the present invention is a cathode, an organic material such as a metal complex is particularly preferably used. The electron injection layer is preferably a very thin film, and the layer thickness is preferably in the range of 1 nm to 10 μm, although it depends on the constituent materials.

(Hole transport layer)
The hole transport layer is made of a hole transport material having a function of transporting holes, and in a broad sense, a hole injection layer and an electron blocking layer also have a function of a hole transport layer. The hole transport layer may be provided as a single layer or a plurality of layers.

The hole transporting material has either injection or transport of holes or an electron barrier property, and may be either an organic substance or an inorganic substance. For example, triazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives, pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, oxazole derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, Examples thereof include stillben derivatives, silazane derivatives, aniline-based copolymers, conductive polymer oligomers and thiophene oligomers.

As the hole transporting material, the above-mentioned compounds can be used, but porphyrin compounds, aromatic tertiary amine compounds and styrylamine compounds can be used, and in particular, aromatic tertiary amine compounds are used. Is preferable.

Typical examples of aromatic tertiary amine compounds and styrylamine compounds are N, N, N', N'-tetraphenyl-4,4'-diaminophenyl, N, N'-diphenyl-N, N'-. Bis (3-methylphenyl)-[1,1'-biphenyl] -4,4'-diamine (abbreviation: TPD), 2,2-bis (4-di-p-tolylaminophenyl) propane, 1,1 -Bis (4-di-p-tolylaminophenyl) cyclohexane, N, N, N', N'-tetra-p-tolyl-4,4'-diaminobiphenyl, 1,1-bis (4-di-p) -Trillaminophenyl) -4-phenylcyclohexane, bis (4-dimethylamino-2-methylphenyl) phenylmethane, bis (4-di-p-tolylaminophenyl) phenylmethane, N, N'-diphenyl-N, N'-di (4-methoxyphenyl) -4,4'-diaminobiphenyl, N, N, N', N'-tetraphenyl-4,4'-diaminodiphenyl ether, 4,4'-bis (diphenylamino) Quadriphenyl, N, N, N-tri (p-tolyl) amine, 4- (di-p-tolylamino) -4'-[4- (di-p-tolylamino) styryl] stilben, 4-N, N Examples thereof include −diphenylamino- (2-diphenylvinyl) benzene, 3-methoxy-4'-N, N-diphenylaminostillbenzene and N-phenylcarbazole.

The hole transport layer is made of the above hole transport material by, for example, a vacuum deposition method, a spin coating method, a casting method, a clavier coating method, a printing method including an inkjet printing method, and an LB method (Langmuir Brodgett method). Although it can be formed by thinning by a known method such as, in the present invention, it is preferable to apply a wet coating method such as a pin coating method, a casting method, a Langmuir coating method, or an inkjet printing method.
.. The thickness of the hole transport layer is not particularly limited, but is usually in the range of about 5 nm to 5 μm, preferably in the range of 5 to 200 nm. The hole transport layer may have a single-layer structure composed of one or more of the above materials.

Further, the p property can be enhanced by doping the material of the hole transport layer with impurities. Examples thereof include JP-A-4-297076, JP-A-2000-196140, JP-A-2001-102175, and J. Am. Apple. Phys. , 95, 5773 (2004) and the like.

As described above, it is preferable to increase the p property of the hole transport layer because a device having lower power consumption can be manufactured.

(Electronic transport layer)
The electron transport layer is composed of a material having a function of transporting electrons, and in a broad sense, an electron injection layer and a hole blocking layer are also included in the electron transport layer. The electron transport layer can be provided as a single-layer structure or a multi-layer laminated structure.

In the electron transport layer having a single layer structure and the electron transport layer having a laminated structure, as an electron transport material (also serving as a hole blocking material) constituting a layer portion adjacent to the light emitting layer, electrons injected from the cathode are used as the light emitting layer. It suffices if it has a function of transmitting. As such a material, any one can be selected and used from conventionally known compounds. Examples thereof include nitro-substituted fluorene derivatives, diphenylquinone derivatives, thiopyrandioxide derivatives, carbodiimides, freolenidene methane derivatives, anthracinodimethanes, anthrone derivatives and oxadiazole derivatives. Further, among the above oxadiazole derivatives, a thiadiazole derivative in which the oxygen atom of the oxadiazole ring is replaced with a sulfur atom, and a quinoxaline derivative having a quinoxaline ring known as an electron-withdrawing group can also be used as a material for the electron transport layer. can. Further, a polymer material in which these materials are introduced into a polymer chain or a polymer material in which these materials are used as a polymer main chain can also be used.

Also, metal complexes of 8-quinolinol derivatives, such as tris (8-quinolinol) aluminum (abbreviation: Alq ₃ ), tris (5,7-dichloro-8-quinolinol) aluminum, tris (5,7-dibromo-8-). Kinolinol) aluminum, tris (2-methyl-8-quinolinol) aluminum, tris (5-methyl-8-quinolinol) aluminum, bis (8-quinolinol) zinc (abbreviation: Znq), etc. and the central metal of these metal complexes A metal complex replaced with In, Mg, Cu, Ca, Sn, Ga or Pb can also be used as a material for the electron transport layer.

The electron transport layer is formed by thinning the above material by a known method such as a vacuum deposition method, a spin coating method, a casting method, a gravure coating method, a printing method including an inkjet printing method, and an LB method. However, in the present invention, it is preferably formed by a wet coating method such as a spin coating method, a casting method, a clavier coating method, or an inkjet printing method.

The thickness of the electron transport layer is not particularly limited, but is usually in the range of about 5 nm to 5 μm, preferably in the range of 5 to 200 nm. The electron transport layer may have a single structure composed of one or more of the above materials.

(Blocking layer)
Examples of the blocking layer include a hole blocking layer and an electron blocking layer, which are layers provided as needed in addition to the constituent layers of the carrier transport function layer unit 3 described above. For example, it is described in JP-A-11-204258, No. 11-204359, and page 237 of "Organic EL Element and Its Industrialization Frontline (November 30, 1998, published by NTS Co., Ltd.)". Examples include a hole blocking (hole block) layer.

The hole blocking layer has a function of an electron transporting layer in a broad sense. The hole blocking layer is made of a hole blocking material having a function of transporting electrons and a significantly small ability to transport holes, and recombination of electrons and holes by blocking holes while transporting electrons. The probability can be improved. In addition, the structure of the electron transport layer can be used as a hole blocking layer, if necessary. The hole blocking layer is preferably provided adjacent to the light emitting layer.

On the other hand, the electron blocking layer has a function of a hole transporting layer in a broad sense. The electron blocking layer is made of a material that has a function of transporting holes and has a significantly small ability to transport electrons, and improves the recombination probability of electrons and holes by blocking electrons while transporting holes. Can be made to. In addition, the structure of the hole transport layer can be used as an electron blocking layer, if necessary. The layer thickness of the hole blocking layer applied to the present invention is preferably in the range of 3 to 100 nm, and more preferably in the range of 5 to 30 nm.

[Second electrode: cathode]
The cathode is an electrode film that functions to supply electrons to the organic functional layer group or the light emitting layer, and a metal, an alloy, an organic or inorganic conductive compound, or a mixture thereof is used. Specifically, when a dry forming method such as a vapor deposition method is used, gold, aluminum, silver, magnesium, lithium, magnesium / copper mixture, magnesium / silver mixture, ittium / silver mixture, magnesium / aluminum mixture, magnesium / Examples thereof include indium mixtures, indium, lithium / aluminum mixtures, rare earth metals, oxide semiconductors such as _{ITO, ZnO, TiO 2} and SnO _2.

When formed by a wet coating method, a pin coating method or casting is performed using a composite (PEDOT: PSS) of poly (3,4-ethylenedioxythiophene) and polystyrene sulfonic acid, silver nanoink, or the like. It can be formed by a method, a clavier coating method, an inkjet printing method, or the like.

The cathode can be produced by forming a thin film of these conductive materials by a method such as thin film deposition or sputtering. The sheet resistance as the second electrode is several hundred Ω / sq. The following is preferable, and the film thickness is usually selected in the range of 5 nm to 5 μm, preferably 5 to 200 nm.

In the case of the double-sided light emitting type in which the organic EL element also extracts the emitted light L from the cathode side, a cathode having good light transmission may be selected and configured.

[Sealing member]
Examples of the sealing means used for sealing the organic EL element include a method of bonding the flexible sealing member, the cathode, and the transparent substrate with a sealing adhesive.

The sealing member may be arranged so as to cover the display area of the organic EL element, and may be intaglio-shaped or flat-plate-shaped. Further, transparency and electrical insulation are not particularly limited.

Specific examples thereof include a thin film glass plate, a polymer plate, a film, and a metal film (metal foil) having flexibility. Examples of the glass plate include soda-lime glass, barium / strontium-containing glass, lead glass, aluminosilicate glass, borosilicate glass, barium borosilicate glass, and quartz. Examples of the polymer plate include polycarbonate, acrylic, polyethylene terephthalate, polyether sulfide, and polysulfone. Examples of the metal film include one or more metals or alloys selected from the group consisting of stainless steel, iron, copper, aluminum, magnesium, nickel, zinc, chromium, titanium, molybdenum, silicon, germanium and tantalum.

In the present invention, a polymer film and a metal film can be preferably used as the sealing member from the viewpoint that the organic EL element can be thinned. Further, the polymer film has a water vapor permeability of 1 × 10 ^-3 g / m ^2. preferably 24h or less, and further, the oxygen permeability was measured by the method based on JIS K 7126-1987 ^{is, 1 × 10 -3 ml / m} 2 · 24h · atm (1atm is 1.01325 × 10 ⁵ a Pa) equal to or lower than a temperature of 25 ± 0.5 ° C., water vapor permeability at a relative humidity of 90 ± 2% RH is preferably not more than ^{1 × 10 -3 g / m 2} · 24h.

Examples of the sealing adhesive include acrylic acid-based oligomers, photocurable and thermosetting adhesives having a reactive vinyl group of methacrylic acid-based oligomers, and moisture-curable adhesives such as 2-cyanoacrylic acid ester. Can be mentioned. In addition, heat and chemical curing type (two-component mixture) such as epoxy type can be mentioned. Further, hot melt type polyamide, polyester and polyolefin can be mentioned. In addition, a cation-curable type ultraviolet-curable epoxy resin adhesive can be mentioned.

<< Components excluding organic EL elements of organic EL devices >>
Next, the details of the main components other than the organic EL element of the organic EL device of the present invention will be described.

[Bass line]
The bus line referred to in the present invention is generally referred to as a signal line for connecting the functions of electronic devices, but in the organic EL device of the present invention, each organic EL element is configured by an applied power source. The wiring for supplying electric power to one electrode is called a bus line.

The material constituting the bus line is a metal material having high conductivity, and from the viewpoint of adhesion to the base material and prevention of corrosion, molybdenum clad aluminum (abbreviation: MAM, molybdenum (Mo) / aluminum (Al) / Molybdenum (Mo)), molybdenum clad copper (abbreviation: MCM, molybdenum (Mo) / copper (Cu) / molybdenum (Mo)) and the like can be mentioned.

[Conductive member (resistive material)]
The conductive member according to the present invention is made of a conductive material whose resistance value can be adjusted, and is not particularly limited, and a known conductive substance can be applied.

As the conductive material, as the inorganic material, for example, a metal such as gold, silver, copper, aluminum, nickel, or cobalt, or indium-tin oxide (ITO), indium-zinc oxide ( Metal oxides such as Indium Zinc Oxide (IZO)), Zinc Oxide (ZnO), or Zinc-Tin Oxide (ZTO), or Antimon-Tin Oxide (ATO) can be exemplified. , It is preferable to use a metal nanoink (silver nanoink or the like) containing these metals or metal oxides in a particle state in that wet coating suitability can be imparted. Silver nano ink is also available as a commercial product, SR6000 and SW1020 manufactured by Bando Chemical Industries, Ltd., colloidal ink JB0420B manufactured by C-ink Co., Ltd., and silver nano ink NBSIJ-MU01 and NBSIJ manufactured by Mitsubishi Paper Mills Limited. -FD02, NBSIJ-KC01 and the like can be mentioned.

Examples of the organic material include conductive carbon materials such as conductive carbon nanotubes and graphene, and conductive polymers such as polythiophene and polyaniline. Among them, the characteristics of excellent flexibility and transparency PEDOT / PSS, which is a kind of organic conductive polymer polythiophene, can be preferably used because it has a feature of being excellent in conductivity. PEDOT / PSS is a composite of poly (3,4-ethylenedioxythiophene) and polystyrene sulfonic acid.

The thickness of the conductive member is formed by the thickness required to achieve the conductivity, transparency, and the like of the conductive member to be applied, and the resistance value required for the conductive member.

[Insulation layer]
Various insulating materials can be used as the material for forming the insulating layer according to the present invention, but an inorganic oxide film having a high relative permittivity is particularly preferable. Inorganic oxides include silicon oxide, aluminum oxide, tantalum oxide, titanium oxide, tin oxide, vanadium oxide, barium titanate / strontium, barium titanate, lead titanate, lead lanthanum titanate, and strontium titanate. , Barium titanate, barium magnesium fluoride, bismuth titanate, strontium bismuth titanate, strontium bismuth tantalate, bismuth niobate tantalate, trioxide yttrium and the like. Of these, silicon oxide, aluminum oxide, tantalum oxide, and titanium oxide are preferred. Inorganic nitrides such as silicon nitride and aluminum nitride can also be preferably used.

Examples of the method for forming the inorganic oxide film include a dry forming method such as a vacuum deposition method, a molecular beam epitaxial growth method, an ion cluster beam method, a low energy ion beam method, an ion plating method, a CVD method, a sputtering method, and an atmospheric pressure plasma method. , Spray coating method, spin coating method, blade coating method, dip coating method, casting method, roll coating method, bar coating method, die coating method, etc. The method is mentioned and it can be used depending on the material. Of these, the inkjet printing method is preferable.

Examples of the organic compound include polyimide, polyamide, polyester, polyacrylate, photoradical polymerization type, photocationic polymerization type photocurable resin, copolymer containing acrylonitrile component, polyvinylphenol, polyvinyl alcohol, novolak resin, and Cyanoethylpurrane, a polymer compound, a phosphazene compound containing an elastomer compound, and the like can also be used. Moreover, as a commercial product, selvinus manufactured by Daicel Corporation and the like can be mentioned.

<< Manufacturing method of organic EL device >>
Generally, the organic EL element includes, for example, a dry forming method using a chemical vapor deposition method, a vacuum vapor deposition method, a spin coating method, a casting method, an LB method (Langmuir Blodgett method), an inkjet printing method, or the like. It can be formed by applying a known thin film forming method such as a wet coating method. Among them, as a method for manufacturing an organic EL device of the present invention, at least the voltage applied to each of the organic electroluminescence elements is adjusted. It is characterized in that a conductive member having a resistance value to be formed is formed by a wet coating method. More preferably, at least the insulating layer, the organic electroluminescence element, the extraction electrode for the first electrode, and the bus line are formed by a wet coating method.

Further, as the wet coating method, it is particularly preferable to apply an inkjet printing method (also referred to as an inkjet printing method).

[Manufacturing flow of organic EL device]
Hereinafter, as an example of a method for manufacturing an organic EL device, a process flow for manufacturing an organic EL device having the configuration of the first embodiment by using an inkjet printing method as a wet coating method will be described with reference to the drawings.

9 and 10 are flow charts showing a manufacturing process of a pixel unit having a configuration on the AA'cut surface described in FIG. 5 in the organic EL device having the configuration shown in FIG.

FIG. 9 is a diagram showing a flow of a manufacturing process in the first half from the formation of the bus line (14) to the formation of the conductive member (16).

<Step 1: Formation of bus line>
As shown in FIG. 9A, first, a bus line (14H) is formed on the base material (1) at a predetermined position as shown in FIGS. 3 and 5, and a forming ink, for example, conductive ink is provided. An ink containing MOM (molybdenum / aluminum / molybdenum) having MOM (molybdenum / aluminum / molybdenum) is ejected from an inkjet head to a predetermined position to form the ink.

<Step 2: Formation of the first electrode (anode) and its extraction electrode>
Next, as shown in FIG. 9B, the first electrode (2) and the extraction electrode (17) are placed at the positions shown in FIGS. 3 and 5, and the inkjet head (30), for example, ITO or the like is placed. Formed by discharging. At this time, the left end portion of the first electrode (2) is formed at a position where a part thereof penetrates into the insulating member (13A) formed in the next step, and the extraction electrode (17) is extended from the first electrode (2). ) Is formed at a position where a part of the right end portion is exposed to the conductive member forming opening (12) formed in the next step.

<Step 3: Addition of insulating member and formation of each opening>
Next, as shown in FIG. 9 (c), on the bus line (14H) and the extraction electrode (17) formed above, an insulating material, for example, a fat which is a transparent sealing agent, is applied from the inkjet head (30). An insulating member (13A, 13B, 13C) is provided by ejecting an ink or the like containing a cyclic epoxy compound to form an organic EL element forming opening (11) and a conductive member forming opening as shown in FIG. (12) is formed.

At this time, in the opening (11) for forming the organic EL element, the end portion of the first electrode (2) is arranged in the insulating member (13A), and the conductive member formed by the two insulating members (13B and 13C). The forming opening (12) has a form in which the end portion of the extraction electrode (17) and the end portion of the bus line (14H) are exposed.

<Step 4: Formation of organic functional layer unit>
Next, as shown in FIG. 9D, ink containing each organic functional layer forming material is sequentially ejected from the inkjet head (30) to the entire region of the organic EL element forming opening (11). , Form an organic functional layer unit (U).

<Step 5: Formation of conductive member>
Next, as shown by FIG. 9 (e), the entire region of the conductive member forming opening (12) where the end of the extraction electrode (17) and the end of the bus line (14) are exposed is inkjetd. As a conductive member for adjusting resistance, for example, a composite (PEDOT: PSS) of poly (3,4-ethylenedioxythiophene) and polystyrene sulfonic acid or silver nanoink is discharged from the head (30) to be a conductive member. (16) is formed to connect the extraction electrode (17), the conductive member (16), and the bus line (14).

At this time, the conductive members (16R, 16G, 16B) having different resistance values can form a conductive member having a desired resistance value by changing the amount of ink ejected and adjusting the layer thickness as appropriate. Further, if necessary, the formed area may be appropriately changed to obtain a desired resistance value.

FIG. 10 is a diagram showing a manufacturing process in the latter half from the formation of the insulating layer (13D) for sealing the conductive member (16) to the application of the sealing substrate (8).

<Step 6: Formation of an insulating layer that seals the conductive member>
Next, as shown in FIG. 10A, an inkjet is used to prevent a short circuit between the conductive member (16) formed in step 5 and the second electrode (6, cathode) formed in the next step 7. For example, ink containing an alicyclic epoxy compound as a transparent sealing agent is ejected from the head (30) to form a fourth insulating layer (13D) on the upper portion of the opening (12) for forming a conductive member. do.

<Step 7: Formation of the second electrode>
Then, as shown in FIG. 10 (b), a composite (PEDOT:) of, for example, poly (3,4-ethylenedioxythiophene) and polystyrene sulfonic acid is applied to the entire surface of the pixel unit from the inkjet head (30). PSS) or silver nanoink is ejected to form a solid second electrode (6).

<Step 8: Formation of adhesive layer for sealing>
Next, as shown in FIG. 10 (c), a sealing adhesive such as a thermosetting adhesive is discharged from the inkjet head (30) onto the entire surface of the pixel unit to form a sealing adhesive layer. (7) is formed.

<Step 9: Addition of sealing substrate>
Finally, as shown in FIG. 10D, an organic EL device is produced by applying, for example, a sealing substrate (8) made of resin on the sealing adhesive layer (7). ..

[Means for forming an organic EL device]
In general, each component including an organic EL element is formed by a known method such as a vacuum deposition method, a spin coating method, a casting method, an LB method (Langmuir Brodget method) and an inkjet printing method. However, the present invention is characterized in that it is formed by a wet coating method such as a spin coating method, a casting method, a Langmuir coating method, or an inkjet printing method, and among them, a main component is formed by an inkjet printing method. Is a preferred embodiment.

(Inkjet printing method)
Hereinafter, an example of the forming method by the inkjet printing method will be described with reference to the drawings.

FIG. 11 is a schematic view showing an example of a method for forming an organic EL element using an inkjet printing method, which is an example of a wet coating method.

In FIG. 11, an ink containing an organic EL element forming material is ejected into an organic EL element forming opening (11) on a base material (1) using a wet coating apparatus using an inkjet head (30). An example of the method is shown.

As shown in FIG. 11, as an example, while continuously transporting the base material (1), the ink jet head (30) sequentially ejects ink containing an organic EL element forming material as ink droplets to form an organic EL. The organic functional layer group (U) of the device is formed. Further, the insulating layer, the organic electroluminescence element, the extraction electrode for the first electrode, the joint portion of the bus line, and the bus line can also be formed by the same method.

The inkjet head (30) applicable to the method for manufacturing an organic EL device of the present invention is not particularly limited. For example, an ink pressure chamber has a vibrating plate provided with a piezoelectric element, and the ink pressure due to the vibrating plate is provided. It may be a shear mode type (piezo type) head that ejects ink liquid by changing the pressure in the chamber, or it has a heat generating element, and the heat energy from this heat generating element causes a sudden volume change due to the boiling of the ink liquid film. It may be a thermal type head that ejects ink liquid from a nozzle.

An ink jet liquid supply mechanism for ejection is connected to the inkjet head (30). The ink liquid is supplied by the tank (38A). In this example, the tank liquid level is kept constant so that the ink liquid pressure in the inkjet head (30) is always kept constant. As a method, the ink liquid overflows from the tank (38A) and is returned to the tank (38B) by natural flow. The ink liquid is supplied from the tank (38B) to the tank (38A) by the pump (31), and the liquid level of the tank (38A) is controlled to be stable according to the injection conditions. ing.

The ink liquid is returned from the pump (31) to the tank (38A) after passing through the filter (32). As described above, it is preferable that the ink liquid is passed through a filter medium having an absolute filtration accuracy or a quasi-absolute filtration accuracy of 0.05 to 50 μm at least once before being supplied to the inkjet head (30).

Further, in order to perform cleaning work and liquid filling work of the inkjet head (30), the ink liquid is forced from the tank (36) and the cleaning solvent is forced from the tank (37) to the inkjet head (30) by the pump (39). Can be supplied to. Such tank pumps may be divided into a plurality of such tank pumps with respect to the inkjet head (30), a branch of a pipe may be used, or a combination thereof may be used. In FIG. 11, the pipe branch (13) is used. Further, in order to sufficiently remove the air in the inkjet head (30), the ink liquid is forcibly sent from the tank (36) to the inkjet (30) by the pump (39), and the ink is discharged from the air bleeding pipe described below. The liquid may be drawn out and sent to the waste liquid tank (34).

FIG. 12 is a schematic external view showing an example of the structure of the inkjet head applicable to the inkjet printing method.

FIG. 12A is a schematic perspective view showing an inkjet head (100) applicable to the present invention, and FIG. 12B is a bottom view of the inkjet head (100).

The inkjet head (100) applicable to the present invention is mounted on an inkjet printer (not shown), and includes a head chip that ejects ink from a nozzle, a wiring board on which the head chip is arranged, and the like. A drive circuit board connected via a wiring board and a flexible board, a manifold for introducing ink into the channel of the head chip via a filter, a housing (56) in which the manifold is housed, and this housing ( The cap receiving plate (57) attached so as to close the bottom opening of 56), the first and second joints (81a, 81b) attached to the first ink port and the second ink port of the manifold, and the manifold. It includes a third joint (82) attached to the third ink port and a cover member (59) attached to the housing (56). Further, mounting holes (68) for mounting the housing (56) on the printer main body side are formed.

Further, the cap receiving plate (57) shown in FIG. 12 (b) is formed as a substantially rectangular plate whose outer shape is long in the left-right direction, corresponding to the shape of the cap receiving plate attaching portion (62). In order to expose the nozzle plate (61) in which a plurality of nozzles are arranged substantially in the center, a long nozzle opening (71) is provided in the left-right direction. Further, regarding the specific structure inside the inkjet head shown in FIG. 12A, for example, FIG. 2 and the like described in Japanese Patent Application Laid-Open No. 2012-140017 can be referred to.

A typical example of the inkjet head is shown in FIG. 12, but in addition to the above, for example, Japanese Patent Application Laid-Open No. 2012-140017, Japanese Patent Application Laid-Open No. 2013-01227, Japanese Patent Application Laid-Open No. 2014-058171 and Japanese Patent Application Laid-Open No. 2014-097644. JP, 2015-142979, 2015-142980, 2016-002675, 2016-002682, 2016-107401, 2017-109476, An inkjet head having the configuration described in JP-A-2017-177626 can be appropriately selected and applied.

(Preparation of ink liquid)
In the method for manufacturing an organic EL device of the present invention, the above-mentioned constituent materials are used in the insulating layer, the organic EL element, the extraction electrode for the first electrode, the joint portion of the bus line, and each ink liquid used for forming the bus line. In addition to the method of using it as an ink liquid as it is, in order to prepare an ink liquid suitable for an inkjet printing method, it is possible to prepare an ink liquid by dissolving a constituent material in an ink solvent or the like, and to contain various functional additives. can.

<Ink solvent>
When preparing the ink liquid according to the present invention, it is preferable to use various known organic solvents. Examples of the organic solvent Y applicable to the ink solution according to the present invention include alcohols (for example, methanol, ethanol, propanol, isopropanol, butanol, isobutanol, secondary butanol, tertiary butanol, pentanol, hexanol, cyclohexanol). , Benzyl alcohol, etc.), polyhydric alcohols (eg, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, butylene glycol, hexanediol, pentanediol, glycerin, hexanetriol, thio Diglycol, etc.), polyhydric alcohol ethers (eg, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobuty ether, diethylene glycol monomethyl ether, diethylene glycol monomethyl ether, diethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol mono Butyl ether, ethylene glycol monomethyether acetate, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monobutyl ether, ethylene glycol monophenyl ether, propylene glycol monophenyl ether, etc.), amines (eg ethanolamine, Diethanolamine, triethanolamine, N-methyldiethanolamine, N-ethyldiethanolamine, morpholine, N-ethylmorpholine, ethylenediamine, diethylenediamine, triethylenetetramine, tetraethylenepentamine, polyethyleneimine, pentamethyldiethylenetriamine, tetramethylpropylenediamine, etc.) , Amides (eg, formamide, N, N-dimethylformamide, N, N-dimethylacetamide, etc.), heterocyclics (eg, 2-pyrrolidone, N-methyl-2-pyrrolidone, cyclohexylpyrrolidone, 2-oxazolidone, 1 , 3-Dimethyl-2-imidazolidinone, etc.), sulfoxides (eg, dimethylsulfoxide, etc.), sulfones (eg, sulfolane, etc.), urea, acetonitrile, acetone, and the like.

<Other additives>
The ink liquid of the present invention contains various known ink liquids according to the purpose of ejection stability, printhead compatibility, storage stability, image storage stability, and other performance improvements as long as the objective effects of the present invention are not impaired. Additives such as solvents, viscosity modifiers, surface tension modifiers, specific resistance modifiers, film-forming agents, dispersants, surfactants, UV absorbers, antioxidants, anti-fading agents, anti-bidding agents, anti-corrosive agents. Agents and the like can be appropriately selected and used.

The organic EL device of the present invention has a simple configuration, the deterioration of light emission quality and the difference in light emission brightness due to the applied voltage difference are improved, and the organic EL device can be manufactured at low cost without requiring large equipment as a manufacturing method. It is an EL device, and can be suitably used for a surface emitter such as a display device, a display, and an illumination light source, and above all, an image display device for a still image intended for a poster or the like instead of a moving image display.

1 Base material 2 First electrode (anode)
3 First organic functional layer group 4 Light emitting layer 5 Second organic functional layer group 6 Second electrode (cathode)
7 Adhesive layer for sealing 8 Sealing substrate 11, 11A, 11B, 11C Opening for forming organic EL element 12, 12A, 12B, 12C Opening for forming conductive member 13, 13A, 13B, 13C, 13D Insulation layer (bank) )
14 Bus Line 14V Bus Line V (Vertical)
14H Bass line H (horizontal)
16, 16R, 16G, 16B Conductive member (resistive member)
17 Pull-out electrode (plane electrode) of the first electrode
18 Applied power supply 20 Organic EL device 21 Wiring 30, 100 Inkjet head 31, 39 Pump 32 Filter 33 Piping branch 34 Waste liquid tank 35 Control unit 36, 37, 38A, 38B Tank 56 Housing 57 Cap receiving plate 59 Cover member 61 Nozzle plate 62 Cap receiving plate mounting part 68 Mounting hole 71 Nozzle opening 81a 1st joy 81b 2nd joint 82 3rd joint L Emission light LA Emission area EL, EL _R , EL _G , EL _B Organic EL element PU pixel unit U Organic functional layer unit

Claims (12)

An organic electroluminescence device having a pixel unit including a plurality of organic electroluminescence elements.
The organic electroluminescence element has at least a first electrode, an organic functional layer including a light emitting layer, and a second electrode on a base material.
The pixel unit has a configuration in which a plurality of the organic electroluminescence elements having different emission colors are arranged on the same surface, and
A single application power supply unit that applies a constant voltage to the entire organic electroluminescence device in a single circuit,
It has a bus line that applies a voltage to each of the first electrodes of the plurality of organic electroluminescence devices.
Since there are places where a conductive member having a resistance value for adjusting the applied voltage is arranged and places where it is not arranged between the applied power supply unit and the organic electroluminescence element, the light emission of each organic electroluminescence element is emitted. An organic electroluminescence device characterized by tuned individual drive. The organic according to claim 1, wherein two or more conductive members having the resistance value are arranged between the bus line and the first electrode of each of the organic electroluminescence elements. Electroluminescence device. The organic electroluminescence device according to claim 1, wherein two or more conductive members having the resistance value are arranged between the bus line and the applied power supply unit. The two or more conductive members connected to the bus line have different resistance values for adjusting so that the difference in voltage applied to the two or more organic electroluminescence elements is within 0.3 V. The organic electroluminescence device according to any one of claims 1 to 3, wherein the organic electroluminescence device is characterized by the above. Claim 1, claim 2 or claim characterized in that an insulating layer having an opening is provided on the base material, and at least the organic electroluminescence element or the conductive member is arranged in the opening. 4. The organic electroluminescence device according to 4. The organic according to any one of claims 1 to 5, wherein the conductive member contains at least a composite of poly (3,4-ethylenedioxythiophene) and polystyrene sulfonic acid. Electroluminescence device. The organic electroluminescence device according to any one of claims 1 to 6, wherein the pixel units are arranged in a plurality of regions surrounded by the bus lines in a grid pattern. .. The organic electroluminescence device according to any one of claims 1 to 7, wherein a still image is displayed by the plurality of pixel units. A method for manufacturing an organic electroluminescence device according to any one of claims 1 to 8, wherein the organic electroluminescence device is manufactured.
A method for manufacturing an organic electroluminescence device, which comprises forming a conductive member having at least a resistance value for adjusting a voltage applied to each of the organic electroluminescence elements by a wet coating method. The organic electroluminescence according to claim 9, wherein at least the insulating layer, the organic electroluminescence element, the extraction electrode for the first electrode, the joint portion of the bus line, and the bus line are formed by a wet coating method. How to make the device. The method for manufacturing an organic electroluminescence device according to claim 9 or 10, wherein the wet coating method is an inkjet printing method. An image display device including the organic electroluminescence device according to any one of claims 1 to 8.
An image display device characterized in that a plurality of pixel units including a plurality of organic electroluminescence elements having different emission colors are arranged on the same plane to display an image.

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