JP2019087503A - Organic electroluminescence device, method for manufacturing the same and image display - Google Patents

Abstract

To provide: an organic EL device having a simple structure, and improved in the worsening of light emission quality attributed to the applied voltage difference and in the brightness difference of light emission; a method for manufacturing an organic EL device, which needs no large-scale facility as manufacturing means, and which enables the low-cost manufacturing; and an image display having the organic EL device.SOLUTION: An organic EL device according to the present invention comprises a pixel unit including a plurality of organic EL elements. The plurality of organic EL elements each have, on a substrate, at least, a first electrode, an organic functional layer including a luminescent layer, and a second electrode. The pixel unit has: a structure in which the plurality of organic EL elements different in luminous color are arrayed in a common plane; bus lines for applying a voltage to respective first electrodes of the plurality of organic EL elements; conductive members having a resistance value for adjusting a voltage to be applied to each organic EL element; and an applied power-source part for applying a voltage to each organic EL element.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an organic electroluminescent device composed of a plurality of organic electroluminescent elements, a method of manufacturing the same, and an image display apparatus equipped with the same. The present invention relates to an organic electroluminescent device having an improved light emission luminance difference and a method of producing an organic electroluminescent device which can be produced at low cost without requiring a large facility as a production means, and an image display apparatus provided with the method .

  As one of the display methods for advertising billboards and the like outdoors, a large billboard using an LED (Light Emitting Diode) as a backlight, a night signage in which the entire billboard is illuminated with an external illuminator, etc. are widely used. There are problems in terms of huge power consumption and economics such as distribution facilities.

  In recent years, organic electroluminescent elements (hereinafter abbreviated as “organic EL elements”) using electroluminescence (hereinafter referred to as “EL”) of organic materials are rapidly spreading, and this organic An EL element is a thin film type completely solid element capable of emitting light at a low voltage of several volts to several tens of volts, and has many excellent features such as high luminance, high luminous efficiency, thinness, and light weight. For this reason, as a surface light emitter such as a display device, a display, an illumination light source, etc., examination of its application field is vigorously made.

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

  In a multicolor display type organic EL device, red is most likely to emit light when a constant voltage is applied due to the difference in drive voltage required for the organic EL elements as light emitting elements, and then green light emission, In order to obtain blue light emission, 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 is used such as a TFT (Thin Film Transistor). It is necessary to emit light at light emission luminance. Therefore, the structure of the organic EL device becomes complicated, and as a result, the device becomes expensive, and the development of an organic EL device that can be manufactured at low cost with simple driving and structure is desired. ing.

  On the other hand, as a method of manufacturing an organic EL device, there is known a method of manufacturing by a dry forming method using a chemical vapor deposition method, a vacuum vapor deposition method or the like, but many of these dry forming methods are large Since the equipment is required, the cost is increased, and there is a problem that it is difficult to manufacture a large-area organic EL element due to the device. In the case of forming R, G, and B light emitting layers on the same plane by a vapor deposition method side by side, it is necessary to form light emitting layers of different configurations, and it is formed with a large area. When trying to move the shadow mask for each pixel, evaporation is performed, so the shadow mask expands due to radiation heat from the evaporation source and the critical problem is that the light emitting layer formation position is shifted. It may occur.

  In recent years, in response to the above problems, coating methods that realize energy saving, large area, light weight, thin film formation accuracy, and can apply a flexible substrate, such as offset printing, gravure printing Research has been actively conducted on “printed electronics” in which an electronic device is manufactured using a wet coating method such as screen printing and inkjet printing.

  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 on the same plane of a light emitting layer forming region constituting an organic EL element by an inkjet printing method. However, it is not a configuration in which each light emitting layer is separated, it is insufficient with respect to light emission separation, has problems with light emission uniformity, and no specific description is given regarding a driving method.

  Further, Patent Document 2 discloses a method of defining the arrangement of constituent materials of an organic EL element 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 disposed 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 the same voltage, and the light emission uniformity among the organic EL elements is insufficient, and the above problem is not solved.

  Further, Patent Document 5 discloses a configuration in which a plurality of organic EL elements are provided, and an anode is coupled to a drive circuit via an adjustment resistor. According to this method, the adjustment resistance value is set such that the difference between the minimum value and the maximum value of the voltage in each organic EL element falls within the range corresponding to 20% of the maximum value. However, in the method described in Patent Document 5, there is no mention at all about arranging organic EL elements different in color development on the same plane or applying a wet coating method as a method for forming the same.

  That is, in the above-mentioned patent documents, a plurality of organic EL elements of different light emission colors are arranged in a completely separated state, and the deterioration of the light emission quality and the light emission luminance difference due to the voltage difference between the organic EL elements are improved. With respect to the organic electroluminescent device and the method for producing the organic electroluminescent device which can be manufactured with a simple configuration and at low cost, a clear description or suggestion is not required, and an immediate response is required.

Patent No. 6122491 gazette WO 2009/113239 JP 2007-273397 A Patent No. 6133301 gazette JP 2001-117525 A

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an organic electroluminescent device having a simple configuration and having a reduced light emission quality and an improved luminance difference due to an applied voltage difference. A method of manufacturing an organic electroluminescent device that can be manufactured at low cost without requiring large equipment as a means, and an image display apparatus equipped with the method.

  As a result of intensive investigations 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 uses it as the first electrode of the organic EL element An organic electroluminescent device having a bus line for applying a voltage, a conductive member having a resistance value for adjusting a voltage applied to the organic EL element, and an applied power supply portion, and has a simple configuration. It has been found that it is possible to realize an organic electroluminescent device in which the decrease in light emission quality and the difference in light emission luminance due to the applied voltage difference can be realized.

  That is, the above-mentioned subject of the present invention is solved by the following means.

1. An organic electroluminescent device comprising a pixel unit comprising a plurality of organic electroluminescent elements, comprising:
The organic electroluminescent device comprises at least a first electrode, an organic functional layer including a light emitting layer, and a second electrode on a substrate,
The pixel unit has a configuration in which a plurality of the organic electroluminescent elements having different emission colors are disposed on the same plane, and
A bus line for applying a voltage to the first electrode of each of the plurality of organic electroluminescent elements;
A conductive member having a resistance value for adjusting a voltage applied to each of the organic electroluminescent elements;
An application power supply unit that applies a voltage to the organic electroluminescent element;
An organic electroluminescent device characterized by having.

  2. The organic according to claim 1, wherein the two or more conductive members having the resistance value are disposed between the bus line and the first electrode of each of the organic electroluminescent devices. Electroluminescent device.

  3. The organic electroluminescent device according to claim 1, wherein two or more of the conductive members having the resistance value are disposed between the bus line and the application 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 electroluminescent elements is within 0.3 V. The organic electroluminescent device according to any one of the items 1 to 3, characterized in that

  5. An insulating layer having an opening is provided on the base material, and at least the organic electroluminescent element or the conductive member is disposed in the opening. The organic electroluminescent device as described in a term.

  6. The organic conductive material 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. Electroluminescent device.

  7. 7. The organic electroluminescent device according to any one of items 1 to 6, wherein the pixel units are respectively disposed in a plurality of regions surrounded by the grid-like bus lines. .

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

9. 9. A method of manufacturing an organic electroluminescent device for manufacturing the organic electroluminescent device according to any one of items 1 to 8, comprising the steps of:
A method of manufacturing an organic electroluminescent device comprising: forming a conductive member having a resistance value for adjusting a voltage to be applied to at least each of the organic electroluminescent elements by a wet coating method.

  10. Furthermore, at least the insulating layer, the organic electroluminescent element, the lead-out electrode for the first electrode, the joint portion of the bus line and the bus line are formed by a wet coating method. Device manufacturing method.

  11. 11. The method of manufacturing an organic electroluminescent device according to claim 9, wherein the wet coating method is an inkjet printing method.

12. An image display apparatus comprising the organic electroluminescent device according to any one of items 1 to 8, comprising:
What is claimed is: 1. An image display apparatus comprising: a plurality of pixel units each including a plurality of organic electroluminescent elements having different emission colors arranged on the same plane to display an image.

  According to the present invention, an organic electroluminescent device having a simple configuration and having a reduced light emission quality and an improved luminance difference due to an applied voltage difference, and a large-scale facility as a manufacturing means are manufactured at low cost. It is possible to provide a method of manufacturing an organic electroluminescent device that can be used, and an image display device equipped with the method.

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

  The organic electroluminescent element is an organic semiconductor, and the voltage required to start light emission differs depending on the light emission color. Generally, in order to form an image, it is necessary to individually drive the pixels, and a passive matrix method or an active matrix method is 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, resulting in an expensive configuration.

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

  As described above, when pixels of different emission colors are driven by the common electrode, the drive voltage of each pixel is different, and therefore, pixels emitting light at a lower voltage preferentially emit light, and a desired emission balance is achieved. It was difficult to obtain an image.

  In the present invention, by providing a voltage adjustment unit corresponding to the drive voltage of each light emission color between the power supply on the anode side and the light emission unit, the voltage applied to the entire panel is made constant regardless of the light emission color. This makes it possible to simultaneously turn on pixels of different emission colors in a single circuit without the need for a driver or a TFT.

Schematic layout showing an example of the whole constitution of the organic EL device composed of a plurality of pixel units of the present invention (Embodiment 1) Schematic which shows the basic composition of Embodiment 1 which is a typical composition of the organic EL device of this invention, and Embodiment 2. Schematic top view which shows an example of the pixel unit which comprises the organic electroluminescent device of this invention (Embodiment 1) Schematic perspective view showing an example of an insulating layer formed on a substrate and two types of openings provided in the insulating layer FIG. 3 is a schematic cross-sectional view showing a configuration represented by a cross section A-A 'of the pixel unit shown in FIG. FIG. 3 is a schematic cross-sectional view showing a configuration represented by a cross section BB ′ of the pixel unit shown in FIG. 3 The schematic block diagram showing an example of the pixel unit which comprises the organic electroluminescent device represented by Embodiment 2 of this invention Schematic sectional drawing which shows an example of a structure of the organic EL element applicable to this invention FIG. 4 is a schematic flowchart showing an example of a manufacturing process of the pixel unit (embodiment 1) represented in FIG. FIG. 4 is a schematic flowchart showing an example of a manufacturing process of the pixel unit (embodiment 1) shown in FIG. 3; Schematic showing an example of an ink jet printing method which is an example of a wet application method Schematic perspective view and bottom view showing an example of the structure of an inkjet head applicable to the inkjet printing method

  The organic electroluminescent device of the present invention has a pixel unit including a plurality of organic electroluminescent devices, and the organic electroluminescent device comprises an organic functional layer including at least a first electrode and a light emitting layer on a substrate. And a second electrode, and the pixel unit has a configuration in which a plurality of the organic electroluminescent devices having different emission colors are arranged on the same plane, and the respective pixel electrodes of the plurality of organic electroluminescent devices A bus line for applying a voltage to one electrode, a conductive member having a resistance value for adjusting a voltage applied to each of the organic electroluminescent elements, and an application power supply unit for applying a voltage to the organic electroluminescent element It is characterized by This feature is a technical feature common to the inventions according to the following embodiments.

  As an embodiment of the present invention, from the viewpoint of being able to further exhibit the effects aimed by the present invention, two or more of the conductive members having the above-mentioned resistance value are connected to one of the bus line and the organic electroluminescent device It is preferable that the first embodiment is disposed between the first electrode and the lead-out electrode of each of the first and second electrodes in that it is possible to further suppress the deterioration of the light emission quality and the expression of the light emission luminance difference. .

  In addition, with the second embodiment in which two or more conductive members having the resistance value are disposed between the bus line and the application power supply unit, the light quality may be reduced with a simpler configuration. It is preferable at the point which can obtain the organic EL device which can suppress expression of a luminescent brightness difference.

  Further, specifically, two or more of the conductive members connected to the bus line are adjusted so that a difference in voltage applied between the two or more of the organic electroluminescent elements is within 0.3 V. It is preferable to have different resistance values for reducing the difference in light emission luminance between the plurality of organic EL elements having different light emission colors and to obtain stable quality.

  An insulating layer having an opening is provided on the base material, and at least the organic electroluminescent element or the conductive member is disposed in the opening, so that it is completely between the organic EL elements or between the conductive members. It is preferable from the point that a short circuit etc. can be prevented effectively and stable driving can be realized by separating into two.

  In addition, it is possible that the conductive member contains at least a composite of poly (3,4-ethylenedioxythiophene) and polystyrene sulfonic acid can impart wet application suitability, and has a desired resistance value by a simple method. It is preferable at the point which can form an electrically-conductive member.

  Moreover, it is a preferable aspect that it is a structure which can display a high definition still image that it is the structure by which the said pixel unit is each arrange | positioned in the several area | region enclosed by the said grid-like bus line. .

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

  In the method of manufacturing an organic EL device according to the present invention, it is necessary to form a conductive member having a resistance value for adjusting a voltage applied to at least each of the organic electroluminescent elements by a wet coating method. It can be manufactured stably at low cost.

  Furthermore, at least forming the insulating layer, the organic electroluminescent element, the lead electrode for the first electrode, the connecting portion of the bus line and the bus line by the wet coating method, and applying the inkjet printing method 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 addition, in this application, "-" showing a numerical range is used by the meaning included as a lower limit and an upper limit with the numerical value described before and behind that. In addition, in description of each figure, the number described in the parenthesis at the end of a component represents the code | symbol in each figure.

<< Basic composition of organic EL device >>
The organic EL device of the present invention has a plurality of organic EL elements having different luminescent colors, each having a first electrode, an organic functional layer including a light emitting layer, and a second electrode, on a base material. A bus line for applying a voltage to each first electrode of the element, a conductive member having a resistance value for adjusting a voltage applied to each of the organic EL elements, and an applied power supply unit for applying a voltage to the organic EL elements It is characterized by being.

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

  FIG. 1 is a schematic layout view (embodiment 1) showing an example of the entire configuration of an organic EL device configured of a plurality of pixel units according to the present invention.

  In a preferred embodiment 1 of the organic EL device (20) shown in FIG. 1, a plurality of bus lines V (14 V) in the longitudinal direction and a plurality of bus lines H (14 H) in the lateral direction are arranged in a grid. Pixel units (PUs) are formed in the block. The bus line is connected to a single simple configuration applied power supply (18) to apply a single condition voltage.

  The “bus line” referred to here is a signal line for supplying power to each organic EL element from an applied power supply, the details of which will be described later. Moreover, a "conductive member" is a conductive material which can adjust resistance value, has a different resistance value, and has a function which adjusts the applied voltage to each organic EL element.

The first to fourth columns of rows A and D have, for example, the same configuration as a pixel unit (PU) shown in FIG. 3 described later, and three organic EL elements (EL _R , EL _G , EL _B ) A configuration in which conductive members (16R, 16G, 16B) are disposed between the respective organic EL elements and the bus lines is mainly a pixel unit (PU) group that performs white light emission display.

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

  In row C-1 column, cyan light is emitted by not forming the conductive member only in the red light emitting organic EL element series, and similarly, magenta emission in row C-2 column, yellow in row C-3 is yellow Make it glow. In addition, black display is performed by removing all the conductive members (16R, 16G, 16B). 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 configuration as described above.

  FIG. 2 is a schematic view showing a basic configuration of an organic EL element series constituting Embodiment 1 and Embodiment 2 which are representative configurations of the organic EL device of the present invention.

  In the first preferred embodiment, the pixel unit (PU) is disposed in each of a plurality of areas surrounded by the latticed bus lines (14).

The configuration shown in (a) of FIG. 2 is a configuration including one organic EL element, for example, the red-emitting organic EL element (EL _R ) described in FIG. 1 in a pixel unit (PU) constituting an organic EL device. And a conductive member (16) having a specific resistance value is disposed between the bus line (14) and the extraction electrode (17) of the first electrode of each of the organic EL elements (EL). Configuration.

  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 the structure arrange | positioned between the bus line (14) and the application power supply part (18). FIG. 2B also shows one series configuration including an organic EL element as shown in FIG. 7 described later, for example.

  Next, the detailed configuration of each of the organic EL devices described in Embodiments 1 and 2 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 Embodiment 1 of the pixel unit constituting the organic EL device of the present invention.

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

  As shown in FIG. 3, the organic EL device described in Embodiment 1 of the present invention is disposed in the lateral direction with the bus line V (14 V) disposed in the longitudinal direction on the base material (not shown). A pixel unit (PU) is formed in a region formed by intersecting the bus lines H (14H) being formed in a grid shape.

The image unit (PU) is a plurality of organic EL elements (EL) different in at least light emission color, and in FIG. 3, a red light emitting organic EL element (EL _R ), a green light emitting organic EL element (EL _G ) and blue light emission The three organic EL elements of the organic EL element (ELB) are disposed 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 lead electrode (17) of the first electrode from one end of the first electrode (2). One end of the lead electrode (17) of one electrode is connected to the lower portion of the conductive member (16R, 16G, 16B) having a resistance value. The detailed configuration will be described with reference to FIG.

The respective conductive members (16R, 16G, 16B) are respectively optimum via the bus line H from a single bus line V (14 V) connected to the applied power supply (18) and to which a constant voltage is applied. The device has a function of applying an optimum voltage to each of the organic EL elements (EL _R , EL _G , and EL _B ) having different voltages for obtaining light emission, and the conductive members individually adjust the applied voltage. It has a resistance value. A specific connection structure of the conductive member and the bus line will also be described later with reference to FIG.

  The resistance value applied 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 5 to 150 Ω. Within the scope of

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

Openings for forming an organic EL element for forming an organic EL element (EL _R , EL _G , EL _B ) as two open portions on the surface of an insulating layer (13) formed on a base (not shown) Openings (12A, 12B, 12C) for forming a conductive member are provided which form (11A, 11B, 11C) and the conductive members (16R, 16G, 16B). In FIG. 3, the description of the second electrode is omitted.

  FIG. 4: is a schematic perspective view which shows an example of the insulating layer formed on the base material, and two types of opening parts (11, 12) formed in the insulating layer surface.

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 disposed on the entire surface.

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

  In the method of forming each opening as shown in FIG. 4, after forming the bus line (14), the first electrode (2), the lead electrode (17) etc. on the base material (1), the organic EL element An insulating layer (13) is formed except for the formation opening (11) and the region for forming the conductive member formation opening (12). Details are shown in FIG. 9 and FIG. 10 described later.

  The organic functional unit (U) of the organic EL element (EL) and the conductive member (16) are formed, for example, using a wet coating method or the like through the openings (11 and 12).

  In the method of forming an organic EL device using a wet coating method, for example, an inkjet printing method, this opening does not require formation of each component via a mask or the like, and high precision and simplicity can be achieved at a predetermined position. It can be formed by any device.

  As described above, the feature of the first embodiment of the organic EL device according to the present invention is that the pixel units are disposed in a plurality of regions surrounded by lattice-shaped bus lines disposed in the vertical and horizontal directions, respectively, The conductive member having the above is disposed between the bus line and the lead-out electrode of the first electrode of the organic EL element. Then, a voltage is applied from a common bus line, and then the light emitting condition of each organic EL element is controlled by conductive members having different resistance values for adjusting the voltage applied to each organic EL element, etc. 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, light emission in each pixel unit is mainly targeted to display a still image represented by a poster or the like, not a variable light emission method for displaying a moving image or the like. It can be manufactured at low cost because it can be manufactured by a simple control method and by a wet coating method that does not require large-scale equipment.

  Next, the specific configuration of the organic EL device described in Embodiment 1 will be described.

  FIG. 5 is a schematic cross-sectional view showing a configuration on a cross section A-A 'of the pixel unit (PU) shown in FIG. 3, and between two bus lines (14H) provided on the substrate (1) An example of Embodiment 1 in which one pixel unit (PU) is formed is shown.

  Although a 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 substrate (1).

  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.

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

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

  An organic functional layer unit (U) including a light emitting layer is formed on the entire surface of the organic EL element forming opening (11). On the other hand, in the conductive member forming opening (12), the end of the lead electrode (17) of the first electrode and the end of the bus line H (14H) are covered and connected, and the desired resistance value is obtained. A conductive member (16) is formed on the entire surface.

  The upper portion of the conductive member forming opening (12) in 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) to be formed later. (13D) is provided.

  A second electrode (7, a cathode) is formed on the entire surface of the organic EL element forming opening (11) and the upper part of the conductive member forming opening (12), and the whole area is covered. A sealing substrate (8) is provided on the adhesive layer (7) and the outermost surface portion to constitute an organic EL device (20).

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

  FIG. 6 is a schematic cross-sectional view showing a configuration on a cross section B-B 'of the pixel unit shown in FIG. 3, in which three organic EL elements are arranged on the same plane on a substrate (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) covered with the insulating layer (13) on the base material (1). Red light emitting organic EL element (EL _R ), green light emitting organic EL element (EL _G ), and 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 the organic EL elements to separate formation regions of the organic EL elements. At this time, as in FIG. 7, each first electrode (2) is formed to be wider than the organic EL element forming opening, and its end is positioned in the insulating layer (13).

  A common second electrode (6, a cathode) is formed on the organic EL element forming openings (11A, 11BB, 11C), and the whole area is covered on the upper part thereof, so that adhesion for sealing is achieved. A sealing substrate (8) is provided on the layer (7) and the outermost surface portion to constitute an organic EL device (20).

Second Embodiment
As Embodiment 2 of the organic EL device of this invention, the structure by which the electrically-conductive member which has resistance value is arrange | positioned between a bus line and an application power supply part can be mentioned.

  FIG. 7 is a schematic side view showing an example of a pixel unit constituting the organic EL device represented in Embodiment 2 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 of each bus line (14) Are connected to the conductive members (16R, 16G, 16B), and voltages are supplied to the conductive members (16R, 16G, 16B) from the applied power supply (18). As in the first embodiment, the voltage of a single condition supplied from the application power supply is adjusted to the optimum voltage of each organic EL element through the conductive members having different resistance values, and the bus line is used. It is a method of supply.

  The other accompanying conditions can be appropriately selected and applied the method described in the first embodiment.

<< Materials of Organic EL Device >>
Next, 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 the basic configuration including the organic functional layer unit of the organic EL element applicable to the present invention.

  The organic EL device (EL) according to the present invention shown in FIG. 8 has a light transmitting substrate (1), for example, a first electrode (2), a light emitting layer on a glass substrate or a flexible resin substrate. The structure of the organic functional layer unit (U) of the structure which laminated | stacked (4) and two organic functional layer groups (3 and 5), 2nd electrode (6), etc. is shown.

  In FIG. 8, an anode (2) is formed as a first electrode in a light emitting area (LA) on a light transmitting substrate (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 constitute the lead-out electrode (17) of the first electrode. The light emitting area (LA) is the same area as the organic EL element forming opening (11).

  On the other hand, in the entire region of the opening (11) for forming an organic EL element above the anode (2), for example, a first organic functional layer group 1 comprising a hole injection layer, a hole transport layer, etc. 3) An organic functional layer unit (U) is formed by laminating a second organic functional layer group 2 (5) composed of a light emitting layer (4) and, for example, an electron transport layer, an electron injection layer, etc. ing.

  A cathode (6) is provided over the entire surface as a second electrode in the upper surface region including the organic functional layer unit (U). And in the structure which covers the said whole laminated body, the adhesive layer for sealing (7) and the sealing substrate (8) are provided, and the organic EL element (EL) is comprised.

  The light emitting area (LA) in the organic EL element (EL) is, as shown in FIG. 8, an anode (2) which is a first electrode, an organic functional layer unit (U), particularly a light emitting layer (4). It refers to a region where all of the second electrode cathodes (6) exist on the same plane.

[Component 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. In addition, the number described in the parenthesis is corresponded to the code | symbol of each component 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 injecting and transporting 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)] / second 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)] / second electrode (6, cathode)
About the outline | summary of the organic EL element which can be applied to this invention, the Unexamined-Japanese-Patent 2013-157634, Unexamined-Japanese-Patent 2013-168552, Unexamined-Japanese-Patent 2013-177361, Unexamined-Japanese-Patent 2013-18721, for example is mentioned 2013-191644, JP-A 2013-191804, JP-A 2013-225678, JP-A 2013-235994, JP-A 2013-243234, JP-A 2013-243236, JP-A 2013- 242366, JP 2013-243371, JP 2013-245179, JP 2014-003249, JP 2014-003299, JP 2014-013910, JP 2014-017493 Publication, JP-A-2014-017494 It can be mentioned configurations described in.

  Further, as specific examples of the tandem-type organic EL element, for example, US Pat. No. 6,337,492, US Pat. No. 742,0203, US Pat. No. 7,473,923, US Pat. No. 6,872,472, US patent No. 6107734, U.S. Pat. No. 6,337,492, JP-A-2006-228712, JP-A-2006-24791, JP-A-2006-49393, JP-A-2006-49394, JP-A 2006-49393 No. 49396, JP-A 2011-96679, JP-A 2005-340187, Patent No. 4711424, Japanese Patent No. 3496681, Japanese Patent No. 3884564, Japanese Patent No. 4213169, Japanese Patent No. 2010-192719 Publication No. 2009-076929 As described in JP-A-2008-078414, JP-A-2007-059848, JP-A-2003-272860, JP-A-2003-045676, WO 2005/009087, WO 2005/094130, etc. Although the element structure, the constituent material, etc. of are mentioned, this invention is not limited to these.

  Furthermore, each layer which comprises an organic EL element is demonstrated.

〔Base material〕
There is no restriction | limiting in particular as a base material (1) applicable to organic EL element (EL), For example, types, such as glass and a resin base material, can be mentioned, Preferably, flexibility is given to an organic EL element It is a flexible resin base material from the viewpoint that it can do.

  Examples of the resin material constituting the resin substrate having flexibility applicable to the present invention include polyesters such as polyethylene terephthalate (abbreviation: PET), polyethylene naphthalate (abbreviation: PEN), polyethylene, polypropylene, cellophane, Cellulose esters such as cellulose diacetate, cellulose triacetate (abbr .: TAC), cellulose acetate butyrate, cellulose acetate propionate (abbr .: CAP), cellulose acetate phthalate, cellulose nitrate and derivatives thereof, polyvinylidene chloride, polyvinyl alcohol Alcohol, polyethylene vinyl alcohol, syndiotactic polystyrene, polycarbonate (abbreviation: PC), norbornene resin, polymethylpentene, polyether ketone , Polyimide, polyether sulfone (abbreviation: PES), polyphenylene sulfide, polysulfones, polyether imide, polyether ketone imide, polyamide, fluorocarbon resin, nylon, polymethyl methacrylate, acrylic and polyarylates, Arton (trade name, Examples thereof include cycloolefin resins and the like such as JSR Corporation) and APEL (trade name, Mitsui Chemicals, Inc.).

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

  Moreover, the above-mentioned resin base material may be an unstretched film or a stretched film.

  The resin base material applicable to the present invention can be manufactured by a conventionally known general film forming method. For example, a substantially amorphous, non-oriented, non-oriented resin substrate can be produced by heating and melting a resin material to be a material with an extruder, extruding and quenching with an annular die or T-die, and the like. . In addition, the unstretched resin base material is conveyed in the transfer direction of the resin base material by a known method such as uniaxial drawing, tenter type sequential biaxial drawing, tenter type simultaneous biaxial drawing, tubular type simultaneous biaxial drawing, etc. A stretched resin substrate can be produced by stretching in the direction (MD direction) or the direction (horizontal axis direction, TD direction) perpendicular to the transport direction of the resin substrate. Although the draw ratio in this case can be suitably selected according to resin used as the raw material of a resin base material, it is preferable to exist in the range of 2 to 10 time in the vertical axis direction and the horizontal axis direction, respectively.

  The thickness of the resin substrate is preferably a thin film resin substrate 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 It is.

  Moreover, as a glass base material which is a base material which has the light transmittance applicable to the present invention, for example, soda lime glass, barium strontium containing glass, lead glass, aluminosilicate glass, borosilicate glass, barium borosilicate glass And quartz.

[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 film metal or alloy, and for example, a metal or metal such as Ag, Au, etc. And oxide semiconductors such as CuI or composite oxides of indium and tin (ITO), SnO ₂ and ZnO.

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

  When silver is used as the main component of the anode, it may be formed of silver alone or of an alloy containing silver (Ag). As such an alloy, for example, silver, magnesium (Ag, Mg), silver, copper (Ag, Cu), silver, palladium (Ag, Pd), silver, palladium, copper (Ag, Pd, Cu), silver Indium (Ag · In) and the like.

  Among the constituent materials constituting the above-mentioned anode, the anode constituting the organic EL element according to the present invention is mainly composed of indium-tin complex oxide (ITO) or silver and has a thickness of 2 to 20 nm It is preferable to set it as the anode which has the light transmittance which exists in the range of, and, more preferably, thickness is in the range of 4-12 nm. If the thickness is 20 nm or less, the absorption component and the reflection component of the light transmitting anode are suppressed to a low level, and a high light transmittance is maintained, which is preferable.

  The layer composed mainly of indium-tin complex 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 The content 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. Moreover, the "light transmitting property" in the light transmitting anode according to the present invention means that the light transmittance at a wavelength of 550 nm is 50% or more.

  In the light-transmitting anode, a layer composed mainly of ITO or silver may be divided into a plurality of layers and stacked as necessary.

  In the present invention, in the case where the anode is a light transmitting anode comprising silver as a main component, the lower part of the light transmitting anode from the viewpoint of enhancing the uniformity of the silver film of the light transmitting anode. And an underlayer can be provided. The underlayer 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 underlayer is a preferred embodiment. is there.

  Moreover, the lead-out electrode (17) of the 1st electrode which concerns on this invention is formed with the same material in the form which extends the said 1st electrode. In the present invention, for the distinction between the first electrode (2) and the extraction electrode (17), the electrode constituting the light emitting region is defined as the first electrode (2), and is connected to the conductive member (16) otherwise. The electrode is defined as an extraction electrode (17).

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

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

  There is no particular limitation on the configuration of such a light emitting layer 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. In addition, the sum total of the thickness of a light emitting layer is the thickness also including the said intermediate layer, when the non-light-emitting intermediate layer exists between light emitting layers.

  In the light emitting layer, a plurality of light emitting materials may be mixed, and 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. As a configuration of the light emitting layer, 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) are contained, and light is preferably emitted from the light emitting material.

  The light emitting layer as described above includes, for example, a vacuum evaporation method, a spin coating method, a casting method, a clavier coating method, an LB method (Langmuir Blodgett, Langmuir Blodgett method), and an ink jet printing method. And the like, but in the present invention, it is preferable to form by a wet coating method such as pin coating method, casting method, cravia coating method, ink jet printing method, etc. In particular, it is formed by ink jet printing method It is preferable to do.

<Host compound>
The host compound contained in the light emitting layer is preferably a compound having a phosphorescent quantum yield of phosphorescence emission at room temperature (25 ° C.) of less than 0.1. Furthermore, it is preferable that a phosphorescence quantum yield is 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 host compounds may be used. By using a plurality of host compounds, charge transfer can be adjusted, and the efficiency of the organic electroluminescent device can be increased. Further, by using a plurality of light emitting materials to be described later, it is possible to mix different light emissions, and thereby it is possible to obtain any light emission color.

  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 (vapor deposition polymerizable light emitting host ) May be.

  As host compounds applicable to the present invention, for example, JP-A-2001-257076, JP-A-2001-357977, JP-A-2002-8860, JP-A-2002-43056, JP-A-2002-105445, and the like. 2002-352957, 2002-2314453, 2002-234888, 2002-260861, 2002-305083, US Patent Application Publication No. 2005/0112407, US Patent Application Publication WO 2009/0030202, WO 2001/039234, WO 2008/056746, WO 2005/089025, WO 2007/063754, WO 2005/030900, WO 2009 No. 086028, WO 2012/023947, can be mentioned JP 2007-254297, JP-European compounds described in Japanese Patent No. 2034538 Pat like.

<Light emitting material>
As a light emitting material which can be used in the present invention, a phosphorescent compound (also referred to as a phosphorescent compound, a phosphorescent material or a phosphorescent dopant) and a fluorescent compound (also a fluorescent compound or a fluorescent material) In particular, it is preferable to use a phosphorescent compound from the viewpoint of obtaining high luminous efficiency.

<1> Phosphorescent compound The phosphorescent compound is a compound in which light emission from an excitation triplet is observed, and more specifically, a compound which phosphoresces at room temperature (25 ° C.), and is a phosphorescent compound. Although the yield is defined as a compound of 0.01 or more at 25 ° C., a preferable phosphorescence quantum yield is a compound of 0.1 or more.

  The above-mentioned phosphorescence quantum yield can be measured by the method described on page 398 (1992 edition, Maruzen) of Spectrum II of Fourth Experimental Chemistry Course 7. The phosphorescence quantum yield in a solution can be measured using various solvents, but in the case of using a phosphorescent compound in the present invention, the phosphorescence quantum yield is 0.01 or more in any of the optional solvents. Should be achieved.

  The phosphorescent compound can be appropriately selected from known ones used in the light emitting layer of a general organic EL device, but preferably contains a metal of group 8 to 10 in the periodic table of the element Complex compounds, more preferably iridium compounds, osmium compounds, platinum compounds (platinum complex compounds) or rare earth complexes, and among them, the iridium compounds are most preferable.

  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 light emitting compound in the light emitting layer changes in the thickness direction of the light emitting layer It may be an aspect that

  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), Appl. Phys. Lett. 78, 1622 (2001), Adv. Mater. 19, 739 (2007), Chem. Mater. 17, 3532 (2005), Adv. Mater. 17, 1059 (2005), WO 2009/100991, WO 2008/101842, WO 2003/040257, US Patent Application Publication No. 2006/835469, US Patent Application Publication No. 2006 / The compounds described in the specification of U.S. Pat. No. 0202194, U.S. Patent Application Publication No. 2007/0087321, U.S. Patent Application Publication No. 2005/0244673 and the like can be mentioned.

  Also, Inorg. Chem. 40, 1704 (2001), Chem. Mater. 16, 2480 (2004), Adv. Mater. 16, 2003 (2004), Angew. Chem. Int. Ed. 2006, 45, 7800, Appl. Phys. Lett. 86, 153505 (2005), Chem. Lett. 34, 592 (2005), Chem. Commun. 2906 (2005), Inorg. Chem. 42, 1248 (2003), WO 2009/050290, WO 2009/000673, U.S. Patent No. 7332232, U.S. Patent Application Publication No. 2009/0039776, U.S. Patent No. 6687266, United States of America Patent Application Publication No. 2006/0008670, U.S. Patent Application Publication No. 2008/0015355, U.S. Patent No. 7396598, U.S. Patent Application Publication No. 2003/0138657, U.S. Patent No. 7090928 The compound as described in etc. can be mentioned.

  Also, Angew. Chem. lnt. Ed. 47, 1 (2008), Chem. Mater. 18, 5119 (2006), Inorg. Chem. 46, 4308 (2007), Organometallics 23, 3745 (2004), Appl. Phys. Lett. 74, 1361 (1999), WO 2006/056418, WO 2005/123873, WO 2006/082742, U.S. Patent Application Publication No. 2005 / 026,041, U.S. Patent No. 7,534,505. The compounds described in U.S. Patent Application Publication No. 2007/0190359, U.S. Patent No. 7338722, U.S. Patent No. 7279704, U.S. Patent Application Publication No. 2006/103874 and the like can also be mentioned. .

  Furthermore, WO 2005/076380, WO 2008/140115, WO 2011/13401, WO 2010/0806089, WO 2012/020327, WO 2011051404. The compounds described in WO 2011/073149, JP 2009-114086, JP 2003-81988, JP 2002-363552, etc. can also be mentioned.

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

The phosphorescent compounds described above are described, for example, in Organic Letter magazine, vol 3, No. 1; 16, 2579-2581 (2001), Inorganic Chemistry, Vol. 30, No. 8, pp. 1685-1687 (1991), J. Org. Am. Chem. Soc. 123, pp. 4304 (2001), Inorganic Chemistry, Vol. 40, No. 7, pp. 1704-1711 (2001), Inorganic Chemistry, Vol. 41, No. 12, pp. 3055-3066 (2002). , New Journal of Chemistry. 26: 1171 (2002), European Journal of
It can synthesize | combine by applying the method disclosed by the references etc. which are described in Organic Chemistry, Volume 4 pages 695-709 (2004), and these references further.

(2) Fluorescent compound As a fluorescent compound, coumarin dyes, pyran dyes, cyanine dyes, croconium dyes, squalium dyes, oxobenzthracene dyes, fluorescein dyes, rhodamine dyes, pyrilium dyes Dyes, perylene dyes, stilbene dyes, polythiophene dyes, rare earth complex phosphors and the like can be mentioned.

Organic functional layer 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 for the purpose of lowering the driving voltage and improving the light emission luminance, and “the organic EL device and its industrial frontier (November 30, 1998 The details are described in the second edition, Chapter 2 "Electrode material" (pages 123 to 166) issued by S. S. Inc., and there are a hole injection layer and an electron injection layer.

  As the charge injection layer, in general, if it is a hole injection layer, it is present between the anode and the light emitting layer or the hole transport layer, and if it is an electron injection layer, it is present between the cathode and the light emitting layer or the electron transport layer. However, the present invention is characterized in that the charge injection layer is disposed adjacent to the light transmitting electrode. In addition, when used as an intermediate electrode, at least one of the electron injection layer and the hole injection layer adjacent to each other may satisfy the requirements of the present invention.

  The hole injection layer is a layer disposed adjacent to the anode, which is one of the electrodes, for the purpose of lowering the driving voltage and improving the light emission luminance. “The organic EL element and its industrialization front line (November 30, 1998 It is described in detail in Chapter 2, "Electrode Material" (p. 123-166), Part 2 of NTS Co., Ltd.).

  The hole injection layer is described in detail in JP-A-9-45479, JP-A-9-260062, JP-A-8-288069, etc. Examples of materials 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, stilbene derivative, polyarylalkane derivative, triarylamine derivative, carbazole derivative, Indolocarbazole derivative, isoindole derivative, acene derivative such as anthracene or naphthalene, fluorene derivative, fluorenone derivative, polyvinylcarbazole, high molecular weight introduced with aromatic amine in main chain or side chain Material or oligomer, polysilane, a conductive polymer or oligomer (e.g., PEDOT (polyethylene dioxythiophene): PSS (polystyrene sulfonic acid), aniline copolymers, polyaniline, polythiophene, etc.) and the like can be mentioned.

  Examples of triarylamine derivatives include benzidine type typified by 4,4′-bis [N- (1-naphthyl) -N-phenylamino] biphenyl (abbreviation: α-NPD), and 4,4 ′, 4 ′ ′ Starburst type represented by -tris [N- (3-methylphenyl) -N-phenylamino] triphenylamine (abbreviation: MTDATA), compounds having fluorene or anthracene in the triarylamine linking core, etc. Be

  In addition, hexaazatriphenylene derivatives as described in JP-A-2003-519432 and JP-A-2006-135145 can also be used as the hole transport material.

  The electron injection layer is a layer provided between the cathode and the light emitting layer in order to lower the driving voltage and to improve the light emission luminance, and the cathode is formed of the light transmitting electrode according to the present invention. Is provided adjacent to the light-transmissive electrode, and the second edition of the “Organic EL element and its industrialization front line (November 30, 1998 issued by NTS Co., Ltd.)” Electrode materials "(pages 123-166).

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

(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, the hole injection layer and the electron blocking layer also have the function of the hole transport layer. The hole transport layer can be provided as a single layer or a plurality of layers.

  The hole transport material has either hole injection or transport or electron barrier properties, and may be either organic or inorganic. For example, triazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives, pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, oxazole derivatives, styryl anthracene derivatives, fluorenone derivatives, hydrazone derivatives, Examples thereof include stilbene derivatives, silazane derivatives, aniline copolymers, conductive polymer oligomers, and thiophene oligomers.

  As the hole transport material, the compounds described above can be used, but porphyrin compounds, aromatic tertiary amine compounds and styrylamine compounds can be used, and in particular, aromatic tertiary amine compounds can be used. Is preferred.

  Representative examples of aromatic tertiary amine compounds and styrylamine compounds include 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) -Tolylaminophenyl) -4-phenylcyclohexane, bis (4-dimethylamino-2-methylphenyl) phenylmethane, bis (4-di-p-tolylaminophenyl) phenylmethane, N, N'-diphenyl-N, '-Di (4-methoxyphenyl) -4,4'-diaminobiphenyl, N, N, N', N'-tetraphenyl-4,4'-diaminodiphenyl ether, 4,4'-bis (diphenylamino) Odriphenyl, N, N, N-tri (p-tolyl) amine, 4- (di-p-tolylamino) -4 '-[4- (di-p-tolylamino) styryl] stilbene, 4-N, N- Diphenylamino- (2-diphenylvinyl) benzene, 3-methoxy-4'-N, N-diphenylaminostilbenzene, N-phenylcarbazole and the like can be mentioned.

The hole transport layer is formed of, for example, a vacuum vapor deposition method, a spin coat method, a cast method, a clavier coat method, a printing method including an ink jet printing method, and an LB method (Langmuir Blodgett, Langmuir Blodgett method). In the present invention, it is preferable to apply a wet coating method such as a pin coating method, a casting method, a clavier coating method, or an inkjet printing method in the present invention.
. The layer thickness of the hole transport layer is not particularly limited, but is usually in the range of about 5 nm to 5 μm, preferably 5 to 200 nm. The hole transport layer may have a single layer structure composed of one or more of the above materials.

  In addition, the p-type can be enhanced by doping the material of the hole transport layer with an impurity. As examples thereof, JP-A-4-297076, JP-A-2000-196140, JP-A-2001-102175, and J.-A. Appl. 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 with lower power consumption can be manufactured.

(Electron transport layer)
The electron transport layer is made of a material having a function of transporting electrons, and in a broad sense, the electron injection layer and the hole blocking layer are also included in the electron transport layer. The electron transporting layer can be provided as a single layer structure or a multilayer structure of a plurality of layers.

  An electron transporting material (also serving as a hole blocking material) constituting a layer portion adjacent to the light emitting layer in the electron transporting layer having a single layer structure and the electron transporting layer having a laminated structure includes electrons injected from the cathode in the light emitting layer It is sufficient if it has a function to transmit. As such a material, any material can be selected and used from conventionally known compounds. For example, nitro-substituted fluorene derivatives, diphenylquinone derivatives, thiopyrandioxide derivatives, carbodiimides, fluorenylidenemethane derivatives, anthraquinodimethanes, anthrone derivatives, oxadiazole derivatives and the like can be mentioned. Furthermore, in the above-mentioned oxadiazole derivative, a thiadiazole derivative in which the oxygen atom of the oxadiazole ring is substituted by a sulfur atom, and a quinoxaline derivative having a quinoxaline ring known as an electron withdrawing group can also be used as a material of the electron transport layer. it can. Furthermore, it is also possible to use 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.

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

  The electron transporting layer is formed by thinning the above-mentioned material by a known method such as a vacuum evaporation 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 preferable to form by a wet coating method such as a spin coating method, a casting method, a clavier coating method, and an inkjet printing method.

  Although there is no restriction | limiting in particular about the layer thickness of an electron carrying layer, Usually, 5 nm-about 5 micrometers, Preferably it exists in the range of 5-200 nm. The electron transport layer may have a single structure composed of one or more of the above materials.

(Blocking layer)
As the blocking layer, a hole blocking layer and an electron blocking layer may be mentioned, and in addition to the respective constituent layers of the carrier transport function layer unit 3 described above, layers may be provided as necessary. For example, they are described in JP-A-11-204258, JP-A-11-204359, and page 237 of "Organic EL element and its forefront of industrialization (issued on November 30, 1998)". Hole blocking (hole block) layer etc. can be mentioned.

  The hole blocking layer generally has a function of an electron transport layer. The hole blocking layer is made of a hole blocking material having an extremely small ability to transport holes while having the function of transporting electrons, and the electron-hole recombination by stopping the holes while transporting the electrons. The probability can be improved. In addition, the configuration 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 transport layer in a broad sense. The electron blocking layer has a function of transporting holes and is made of a material having a very small ability to transport electrons, and improves the probability of recombination of electrons and holes by blocking electrons while transporting holes. It can be done. In addition, the configuration of the hole transport layer can be used as an electron blocking layer as required. The layer thickness of the hole blocking layer applied to the present invention is preferably in the range of 3 to 100 nm, 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 and the light emitting layer, and a metal, an alloy, an organic or inorganic conductive compound, or a mixture thereof is used. Specifically, when using a dry forming method such as vapor deposition, gold, aluminum, silver, magnesium, lithium, magnesium / copper mixture, magnesium / silver mixture, yttrium / silver mixture, magnesium / aluminum mixture, magnesium / Indium mixtures, indium, lithium / aluminum mixtures, rare earth metals, oxide semiconductors such as ITO, ZnO, TiO ₂ and SnO _{2, and the} like can be mentioned.

  In the case of forming using a wet coating method, a pin coat method or cast using a composite of poly (3,4-ethylenedioxythiophene) and polystyrene sulfonic acid (PEDOT: PSS), silver nanoink, etc. It can be formed by a method, a clevia coating method, an ink jet printing method or the like.

  The cathode can be produced by forming a thin film of such a conductive material by a method such as vapor deposition or sputtering. In addition, the sheet resistance as the second electrode is several hundreds 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 a double-sided light emission type in which the organic EL element takes out the light L from the cathode side as well, it is preferable to select a cathode having a good light transmittance.

[Sealing member]
As a sealing means used for sealing an organic EL element, the method of adhere | attaching a flexible sealing member, a cathode, and a transparent substrate with the adhesive agent for sealing can be mentioned, for example.

  The sealing member may be disposed so as to cover the display region of the organic EL element, and may be a concave plate or a flat plate. Moreover, transparency and electrical insulation are not particularly limited.

  Specifically, a thin film glass plate with flexibility, a polymer plate, a film, a metal film (metal foil) and the like can be mentioned. Examples of the glass plate include soda lime glass, glass containing barium and strontium, lead glass, aluminosilicate glass, borosilicate glass, barium borosilicate glass, quartz and the like. Moreover, as a polymer board, a polycarbonate, an acryl, a polyethylene terephthalate, polyether sulfide, a polysulfone etc. can be mentioned. 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, as the sealing member, a polymer film and a metal film can be preferably used from the viewpoint of being able to thin the organic EL element. Furthermore, the polymer film has a water vapor transmission rate of 1 × 10 ⁻³ g / m ² · at a temperature of 25 ± 0.5 ° C. and a relative humidity of 90 ± 2% RH, which is measured by a method according to JIS K 7129-1992. The oxygen permeability is preferably 24 h or less, and more preferably 1 × 10 ⁻³ ml / m ² · 24 h · atm (1 atm is 1.01325 ×) as measured by the method according to JIS K 7126-1987. 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.

  As a sealing adhesive, for example, an adhesive such as an acrylic acid-based oligomer, a photocurable and thermosetting adhesive having a reactive vinyl group of a methacrylic acid-based oligomer, a moisture-curable adhesive such as 2-cyanoacrylic acid ester, etc. Can be mentioned. Moreover, heat and chemical curing types (two-component mixture) such as epoxy type can be mentioned. Further, examples thereof include hot melt type polyamides, polyesters and polyolefins. Further, there can be mentioned a cation curing type UV curable epoxy resin adhesive.

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

[Bus line]
The bus line in the present invention is generally referred to as a signal line for connecting the function of the electronic device, but in the organic EL device of the present invention, each of the organic EL elements is formed of an applied power source. A wire for supplying power to one electrode is called a bus line.

  The material forming the bus line is a metal material having high conductivity, and from the viewpoint of adhesion to a substrate and prevention of corrosion, molybdenum clad aluminum (abbreviation: MAM, molybdenum (Mo) / aluminum (Al) / Examples thereof include molybdenum (Mo) and molybdenum clad copper (abbreviation: MCM, molybdenum (Mo) / copper (Cu) / molybdenum (Mo)) and the like.

[Conductive member (resistance 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 known conductive materials can be applied.

  As a conductive material, as an inorganic material, for example, a metal such as gold, silver, copper, aluminum, nickel, or cobalt, or indium tin oxide (ITO), indium zinc oxide (indium tin oxide (ITO)) Examples include metal oxides such as Indium Zinc Oxide (IZO), zinc oxide (Zinc Oxide (ZnO)), or zinc-tin oxide (Zinc Tin Oxide (ZTO)), or antimony-tin oxide (ATO). It is preferable to use a metal nanoink (such as a silver nanoink) containing these metals or metal oxides in the form of particles, since this can impart wet coating suitability. Silver nanoinks can be obtained as commercial products, and SR6000 and SW1020 manufactured by Bando Chemical, colloidal ink JB 0420B manufactured by C-ink Co., Ltd., NBSIJ-MU01 which is a silver nanoink manufactured by Mitsubishi Paper Industries, and NBSIJ -FD02, NBSIJ-KC01 etc. can be mentioned.

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

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

[Insulating layer]
Various insulating materials can be used as a material for forming the insulating layer according to the present invention, and in particular, an inorganic oxide film having a high dielectric constant is preferable. As the inorganic oxide, silicon oxide, aluminum oxide, tantalum oxide, titanium oxide, tin oxide, vanadium oxide, barium strontium titanate, barium zirconate titanate, lead zirconate titanate, lead lanthanum titanate, strontium titanate And barium titanate, barium and magnesium fluoride, bismuth titanate, strontium and bismuth titanate, strontium and bismuth tantalate, bismuth tantalate niobate, yttrium trioxide and the like. Among them, preferred are silicon oxide, aluminum oxide, tantalum oxide and titanium oxide. Inorganic nitrides such as silicon nitride and aluminum nitride can also be suitably used.

  The inorganic oxide film can be formed by a dry deposition method such as vacuum evaporation, molecular beam epitaxial growth, ion cluster beam, low energy ion beam, ion plating, CVD, sputtering, atmospheric pressure plasma, etc. Wet forming methods such as spray coating method, spin coating method, blade coating method, dip coating method, casting method, roll coating method, bar coating method, die coating method, coating method, patterning method such as printing or inkjet printing method Laws can be mentioned and can be used depending on the material. Among these, the inkjet printing method is preferable.

  Moreover, as the organic compound, polyimide, polyamide, polyester, polyacrylate, radical photopolymerization system, photocurable resin of cationic photopolymerization system, copolymer containing acrylonitrile component, polyvinylphenol, polyvinyl alcohol, novolac resin, and It is also possible to use cyanoethyl pullulan, a polymer, a phosphazene compound including an elastomer, and the like. Moreover, as a commercial item, cells manufactured by Daicel, etc. can be mentioned.

<< Manufacturing method of organic EL device >>
In general, organic EL elements are, for example, dry forming methods using chemical vapor deposition, vacuum evaporation, etc., spin coating, casting, LB (Langmuir Blodgett, Langmuir Blodgett), inkjet printing, etc. It can be formed by applying a known thin film forming method such as a wet coating method, and among them, as a method of manufacturing the organic EL device of the present invention, at least adjusting the voltage applied to each of the organic electroluminescent elements The conductive member having the resistance value is formed by a wet coating method. More preferably, at least the insulating layer, the organic electroluminescent element, the lead 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 of manufacturing an organic EL device, a process flow of manufacturing an organic EL device having the configuration of Embodiment 1 using an inkjet printing method as a wet coating method will be described with reference to the drawings.

  FIG. 9 and FIG. 10 are flow charts showing manufacturing steps of a pixel unit having a configuration on the cross section A-A 'described in FIG. 5 in the organic EL device having the configuration shown in FIG.

  FIG. 9 is a diagram showing the flow of the first half of the manufacturing process 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, on the base material (1), a bus line (14H) is formed at a predetermined position as shown in FIG. 3 and FIG. The ink containing MOM (molybdenum / aluminum / molybdenum) is formed by being ejected from an ink jet head at a predetermined position.

<Step 2: Formation of First Electrode (Anode) and Its Extraction Electrode>
Then, as shown in (b) of FIG. 9, the first electrode (2) and the lead-out electrode (17) at the positions described in FIG. 3 and FIG. It discharges and forms. At this time, the left end portion of the first electrode (2) is formed at a position where a part thereof intrudes into the insulating member (13A) to be formed in the next step, and the lead electrode (17) extended from the first electrode (2) The right end portion of) is formed at a position where a part thereof is exposed to the conductive member forming opening (12) to be formed in the next step.

<Step 3: Application of Insulating Member and Formation of Each Opening>
Next, as shown in (c) of FIG. 9, on the bus line (14H) and the lead-out electrode (17) formed above, an insulating material, for example, an oil which is a transparent sealant from the inkjet head (30) Ink or the like containing a cyclic epoxy compound is discharged to apply insulating members (13A, 13B, 13C), and an opening (11) for forming an organic EL element and an opening for forming a conductive member as shown in FIG. Form (12).

  At this time, in the organic EL element formation opening (11), the end of the first electrode (2) is disposed in the insulating member (13A), and a conductive member formed of two insulating members (13B and 13C) The end of the lead-out electrode (17) and the end of the bus line (14H) are exposed in the formation opening (12).

<Step 4: Formation of Organic Functional Layer Unit>
Next, as shown in (d) of FIG. 9, the ink containing each organic functional layer forming material is sequentially ejected from the ink jet head (30) over the entire area of the organic EL element forming opening (11). , Organic functional layer unit (U).

<Step 5: Formation of Conductive Member>
Then, as shown in (e) of FIG. 9, the entire area of the conductive member forming opening (12) where the end of the lead electrode (17) and the end of the bus line (14) are exposed As a conductive member for resistance adjustment, for example, a composite of poly (3,4-ethylenedioxythiophene) and polystyrene sulfonic acid (PEDOT: PSS) or a silver nanoink is discharged from the head (30) to obtain a conductive member. (16) is formed to connect the lead 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 conductive members having desired resistance values by changing the discharge amount of the ink and adjusting the layer thickness appropriately. In addition, the area to be formed may be changed as needed to obtain a desired resistance value.

  FIG. 10 is a diagram showing the second half of the manufacturing process 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 Insulating Layer for Sealing Conductive Member>
Next, as shown in (a) of FIG. 10, in order 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, A fourth insulating layer (13D) is formed on the conductive member forming opening (12) by discharging, for example, an ink containing an alicyclic epoxy compound, which is a transparent sealing agent, from the head (30). Do.

<Step 7: Formation of Second Electrode>
Next, as shown in (b) of FIG. 10, for example, a composite of poly (3,4-ethylenedioxythiophene) and polystyrene sulfonic acid (PEDOT :) from the ink jet head (30) on the entire surface of the pixel unit. The solid second electrode (6) is formed by discharging PSS) or silver nanoink.

<Step 8: Formation of Adhesive Layer for Sealing>
Next, as shown in FIG. 10C, for example, a sealing adhesive such as a thermosetting adhesive is discharged from the ink jet head (30) over the entire surface of the pixel unit to form an adhesive layer for sealing. Form (7).

<Step 9: Application of Sealing Substrate>
Finally, as shown in (d) of FIG. 10, a sealing substrate (8) made of, for example, a resin is applied on the sealing adhesive layer (7) to fabricate an organic EL device. .

[Method of forming organic EL device]
Generally, each component including an organic EL element is formed by a known method such as vacuum evaporation, spin coating, casting, LB (Langmuir Blodgett, Langmuir Blodgett), and inkjet printing. In the present invention, it is characterized in that it is formed by a wet coating method such as spin coating method, casting method, clavier coating method, ink jet printing method, etc., among them, the main constituent members are particularly formed by ink jet printing method. Is a preferred embodiment.

(Ink jet printing method)
Hereinafter, an example of the formation 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 of forming an organic EL element using an inkjet printing method which is an example of a wet coating method.

  FIG. 11: discharges the ink containing an organic EL element formation material in the opening part (11) for organic EL element formation on a base material (1) using the wet coating device using an inkjet head (30) An example of the method is shown.

  As shown in FIG. 11, as one example, while continuously transporting the substrate (1), the ink containing the organic EL element forming material is sequentially ejected as ink droplets by the ink jet head (30), and the organic EL The organic functional layer group (U) of the device is formed. In addition, the insulating layer, the organic electroluminescent element, the lead-out electrode for the first electrode, the connection portion of the bus line, and the bus line can also be formed by the same method.

  The ink jet head (30) applicable to the method of manufacturing an organic EL device according to the present invention is not particularly limited. For example, a diaphragm having a piezoelectric element in an ink pressure chamber is provided. It may be a shear mode type (piezo type) head that ejects the ink liquid by pressure change in the chamber, or has a heater element, and the heat energy from this heater element causes rapid volume change due to film boiling of the ink liquid. It may be a thermal type head which ejects the ink liquid from the nozzle.

  An ink jet ink supply mechanism or the like is connected to the ink jet head (30). The supply of the ink liquid is performed by the tank (38A). In this example, the tank liquid level is made constant so that the ink liquid pressure in the ink jet head (30) is always kept constant. As the method, the ink liquid overflows from the tank (38A) and returns to the tank (38B) by gravity flow. The supply of the ink liquid from the tank (38B) to the tank (38A) is performed by the pump (31), and is controlled so that the liquid level of the tank (38A) becomes stable stably in accordance with the ejection conditions. ing.

  When the ink liquid is returned from the pump (31) to the tank (38A), it is carried out through the filter (32). As described above, it is preferable that the ink liquid passes the filter medium having absolute filtration accuracy or quasi-absolute filtration accuracy of 0.05 to 50 μm at least once before being supplied to the ink jet head (30).

  In addition, the ink liquid is forced from the tank (36) and the washing solvent is forced from the tank (37) to the ink jet head (30) by the pump (39) in order to carry out the washing operation and the liquid filling operation of the ink jet head (30). It is possible to supply Such tank pumps may be divided into a plurality of parts with respect to the ink jet head (30), a branch of piping may be used, or a combination thereof may be used. In FIG. 11, the pipe branch (13) is used. Furthermore, in order to remove air in the ink jet head (30) sufficiently while forcibly sending the ink liquid from the tank (36) to the ink jet (30) by the pump (39), the ink from the air vent piping described below The liquid may be withdrawn and sent to a waste tank (34).

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

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

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

  Further, the cap receiving plate (57) shown in (b) of FIG. 12 is formed as a substantially rectangular plate whose outer shape is elongated in the left-right direction corresponding to the shape of the cap receiving plate attachment portion (62) In order to expose a nozzle plate (61) in which a plurality of nozzles are disposed substantially at the center, a nozzle opening (71) elongated in the left-right direction is provided. Moreover, regarding the specific structure inside the inkjet head shown by (a) of FIG. 12, it can refer, for example to FIG. 2 etc. which are described in Unexamined-Japanese-Patent No. 2012-140017.

  Although the representative example of the inkjet head was shown in FIG. 12, in addition to that, for example, Unexamined-Japanese-Patent 2012-140017, Unexamined-Japanese-Patent 2013-010227, 2014-058171, 2014-097644 is shown. JP, 2015-142979, 2015-142980, 2016-002675, 2016-002682, 2016-107401, 2017-109476, The inkjet head which consists of a structure described in Unexamined-Japanese-Patent No. 2017-177626 etc. can be selected suitably, and can be applied.

(Preparation of ink liquid)
In the method of manufacturing an organic EL device according to the present invention, the respective constituent materials described above are used in the respective ink liquids used for forming the insulating layer, the organic EL element, the lead electrode for the first electrode, the connecting portion of the bus line and the bus line. In addition to the method of using it as an ink liquid as it is, in order to obtain an ink liquid suitable for the inkjet printing method, the constituent material is dissolved in an ink solvent or the like to prepare an ink liquid, and various functional additives are included. it can.

<Ink solvent>
When preparing the ink liquid according to the present invention, it is preferable to use various known organic solvents. Examples of organic solvents applicable to Y according to the present invention include alcohols (eg, 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) Cole monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monomethyl ether, diethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether, propylene glycol monobutyl ether, ethylene glycol monomethyl ether acetate, triethylene glycol monomethyl ether, triethylene glycol mono Ethyl 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.), heterocycles (eg 2-pyrrolidone, N-methyl-2-pyrrolidone, cyclohexyl pyrrolidone, 2-oxazolidone, 1,3-dimethyl-2-imidazolidinone etc.), sulfoxides For example, dimethyl sulfoxide and the like), sulfones (eg, sulfolane and the like), urea, acetonitrile, acetone and the like can be mentioned.

<Other additives>
The ink liquid of the present invention may be any of various known methods according to the purpose of improving ejection stability, print head compatibility, storage stability, image storage property, and other various performances, as long as the object effects of the present invention are not impaired. Additives, for example, solvents, viscosity modifiers, surface tension modifiers, specific resistance modifiers, film forming agents, dispersants, surfactants, UV absorbers, antioxidants, anti-fading agents, anti-biocides, rust prevention An agent etc. can be selected suitably and can be used.

  The organic EL device of the present invention has a simple structure, is improved in light emission quality and light emission luminance difference due to applied voltage difference, and can be manufactured at low cost without requiring large equipment as a manufacturing method. It is an EL device, and can be suitably used as a surface light emitter such as a display device, a display, an illumination light source, and the like, among them, an image display device based on a still image intended for a poster etc.

1 substrate 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 Layers for Sealing 8 Sealing Substrates 11, 11A, 11B, 11C Openings for Forming an Organic EL Element 12, 12A, 12B, 12C Openings for Forming a Conductive Member 13, 13A, 13B, 13C, 13D Insulating Layer (Bank )
14 bus line 14V bus line V (vertical)
14H Bus line H (horizontal)
16, 16R, 16G, 16B Conductive member (resistance member)
17 Extraction electrode for first electrode (planar electrode)
18 application power source 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 Joint 81b 2nd Joint 82 3rd Joint L Luminescent Light LA Luminescent Area EL, EL _R , EL _G , EL _B Organic EL Element PU Pixel Unit U Organic functional layer unit

Claims (12)

An organic electroluminescent device comprising a pixel unit comprising a plurality of organic electroluminescent elements, comprising:
The organic electroluminescent device comprises at least a first electrode, an organic functional layer including a light emitting layer, and a second electrode on a substrate,
The pixel unit has a configuration in which a plurality of the organic electroluminescent elements having different emission colors are disposed on the same plane, and
A bus line for applying a voltage to the first electrode of each of the plurality of organic electroluminescent elements;
A conductive member having a resistance value for adjusting a voltage applied to each of the organic electroluminescent elements;
An application power supply unit that applies a voltage to the organic electroluminescent element;
An organic electroluminescent device characterized by having.   The organic matter according to claim 1, wherein two or more of the conductive members having the resistance value are disposed between the bus line and the first electrode of each of the organic electroluminescent elements. Electroluminescent device.   The organic electroluminescent device according to claim 1, wherein two or more of the conductive members having the resistance value are disposed between the bus line and the application 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 electroluminescent elements is within 0.3 V. The organic electroluminescent device according to any one of claims 1 to 3, characterized in that:   The insulating layer which has an opening part is provided on the said base material, At least the said organic electroluminescent element or the said electroconductive member is arrange | positioned at the said opening part, The said Claim 1 or Claim 2 or Claim. The organic electroluminescent device as described in 4.   The organic conductive material 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. Electroluminescent device.   The organic electroluminescent device according to any one of claims 1 to 6, wherein the pixel units are respectively disposed in a plurality of regions surrounded by the grid-like bus lines. .   The organic electroluminescent device according to any one of claims 1 to 7, wherein a still image is displayed by the plurality of pixel units. A method of manufacturing an organic electroluminescent device for manufacturing an organic electroluminescent device according to any one of claims 1 to 8,
A method of manufacturing an organic electroluminescent device comprising: forming a conductive member having a resistance value for adjusting a voltage to be applied to at least each of the organic electroluminescent elements by a wet coating method.   10. The organic electroluminescence according to claim 9, wherein at least the insulating layer, the organic electroluminescent element, the lead-out electrode for the first electrode, the joint portion of the bus line and the bus line are formed by a wet coating method. Device manufacturing method.   The method for manufacturing an organic electroluminescent device according to claim 9 or 10, wherein the wet coating method is an inkjet printing method. An image display apparatus comprising the organic electroluminescent device according to any one of claims 1 to 8,
What is claimed is: 1. An image display apparatus comprising: a plurality of pixel units each including a plurality of organic electroluminescent elements having different emission colors arranged on the same plane to display an image.

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