JP2004303699A - Organic el device, its manufacturing method, and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic EL device prevented from being short-circuited due to the mutual contact of second electrodes and having an excellent luminescent life. <P>SOLUTION: This organic EL device 1 has a plurality of first electrodes 3 formed on a substrate 2; a plurality of separators 4 extending in a band shape in a direction intersecting the first electrodes 3 to separate the second electrodes 5; the second electrodes 5 formed between the separators 4; and organic functional layers 6 formed between the first electrodes 3 and the second electrodes 5 at intersecting regions of the first electrodes 3 and second electrodes 5. The organic EL device 1 is further provided with bank layers 10 formed with openings 10a corresponding to the intersecting regions of the first electrodes 3 and second electrodes 5, and the organic functional layers 6 are formed inside the openings 10a of the bank layers 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an organic EL device, a method for manufacturing the same, and electronic equipment.
[0002]
Problems to be solved by the prior art and the invention
2. Description of the Related Art In recent years, in electronic devices such as a notebook computer, a mobile phone, and an electronic organizer, a display device such as an organic EL device including an organic electroluminescence (hereinafter, referred to as an organic EL) element corresponding to a pixel as means for displaying information has been proposed. ing.
[0003]
As one of such organic EL devices, there is a passive matrix type (simple matrix type) organic EL device. In general, this passive matrix type organic EL device has a plurality of first electrodes formed on a substrate and extending in a band in a predetermined direction, and a plurality of bands arranged in a direction perpendicular to the first electrodes. A second electrode, and an organic functional layer vertically interposed between the first electrode and the second electrode in an intersecting region of the first electrode and the second electrode. The organic functional layer includes a light emitting layer that emits light when a current flows through the first electrode and the second electrode. In the passive matrix type organic EL device, the organic functional layer including the light emitting layer corresponds to one pixel. It is configured by providing a plurality of such components.
[0004]
Incidentally, the second electrode of such a passive matrix type organic EL device is generally formed by a vacuum evaporation method. According to this vacuum deposition method, as is well known, a separator having a predetermined thickness is provided between the regions where the second electrodes are formed, and the second electrode material is deposited in a direction perpendicular or oblique to the substrate surface. By doing so, the second electrodes are separated from each other. When the organic functional layer is formed by the droplet discharging method, the organic functional layer material is discharged by discharging the organic functional layer material on the first electrodes exposed between the above-described separators, and then drying to form the organic functional layer. .
[0005]
However, depending on the drying conditions, the organic functional layer may be formed so as to protrude along the side wall of the separator. When the second electrode material is deposited in such a state, the second electrode deposited on the separator may be formed. The material and the second electrode material deposited between the separators may come into contact with each other, and as a result, the second electrodes may be electrically connected to each other, causing a short circuit.
[0006]
Even if the organic functional layer is formed in a state of being raised along the side wall of the separator, the second electrodes are separated from each other by depositing the second electrode material obliquely with respect to the substrate surface. be able to. However, in this case, since the second electrode does not completely cover the organic functional layer, there is a problem that the organic functional layer is easily deteriorated by moisture or the like.
[0007]
[Patent Document 1]
JP-A-11-87063
The present invention has been made in view of the above problems, and has the following objects.
(1) To provide an organic EL device in which a short circuit caused by contact between second electrodes is prevented.
(2) To provide an organic EL device having a good emission life.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, an organic EL device according to the present invention includes a plurality of first electrodes formed on a substrate, a plurality of first electrodes extending in a band crossing the first electrodes, and a plurality of first electrodes. A plurality of separators for separation, a second electrode formed between the separators, and an organic function formed between the first electrode and the second electrode in an intersection region between the first electrode and the second electrode An organic EL device, comprising: a bank layer having an opening corresponding to an intersecting region between a first electrode and a second electrode, wherein the organic functional layer is formed inside the opening of the bank layer. It is characterized by being performed.
[0010]
Further, the method for manufacturing an organic EL device according to the present invention is a method for manufacturing an organic EL device in which an organic functional layer is formed between electrodes, and includes a step of forming a plurality of first electrodes on a substrate, Forming a bank layer having an opening corresponding to the region, forming a plurality of separators for separating the second electrode, and forming an organic functional layer inside the opening of the bank layer; Forming a second electrode between the separators.
[0011]
According to the organic EL device having such a configuration, since the separator and the bank layer are provided separately, when the organic functional layer material is discharged by the droplet discharge method into the opening formed in the bank layer, the organic EL device is not used. All of the discharged organic functional layer material enters the opening without adhering to the side wall of the separator. Therefore, the organic functional layer material does not adhere to the side wall of the separator after drying. For this reason, since the organic functional layer does not rise along the side wall of the separator after drying, even if the second electrode material is formed by vapor deposition, the second electrode material deposited on the separator and the second electrode material deposited between the separators Does not contact. As a result, it is possible to separate the second electrodes. That is, it is possible to provide an organic EL device in which a short circuit caused by contact between the second electrodes is prevented.
[0012]
In the present invention, the thickness of the bank layer is preferably equal to or greater than the thickness of the organic functional layer. By employing such a configuration, all the layers are formed, particularly when the organic functional layer is a laminate in which a hole injection / transport layer, a light emitting layer, an electron injection / transport layer, and the like are laminated. In this case, the material for forming each layer can be discharged to the opening of the bank layer. Therefore, it is possible to prevent the above-mentioned material from adhering to the side wall of the separator, and as a result, it is possible to more reliably separate the second electrodes.
[0013]
Further, the second electrode of the present invention is formed so as to cover an opening formed in the bank layer. By employing such a configuration, the organic functional layer is accommodated in a space surrounded by the first electrode, the second electrode, and the bank layer. For this reason, it becomes possible to protect the organic functional layer from moisture, air, and the like that enter from the outside, and as a result, it is possible to provide an organic EL device having a good emission life.
[0014]
Further, the separator of the present invention is preferably formed in a reverse tapered shape, and the second electrode material is preferably deposited from a direction perpendicular to the substrate surface. When the second electrode is formed by a vacuum deposition method, it is not easy to accurately position the end in the width direction of the second electrode. Therefore, by adopting the above-described configuration, the second electrode material can be surely deposited so as to cover the opening of the bank layer without accurately positioning the end in the width direction of the second electrode. Becomes possible.
[0015]
Next, the method for manufacturing an organic EL device according to the present invention includes a step of making the surface of the bank layer lyophobic and making the first electrode exposed at the opening of the bank layer lyophilic. By this step, the surface of the bank layer is made lyophobic and the first electrode exposed at the opening of the bank layer is made lyophilic, so that the position at which the organic functional layer material is discharged by the droplet discharging method is shifted. Even when a part of the organic functional layer material adheres to the upper surface of the bank layer or the like, it is possible to reliably guide the organic functional layer material onto the lyophilic first electrode.
[0016]
Next, an electronic apparatus according to the present invention includes the above-described organic EL device as a display unit. Examples of the electronic device of the present invention include a notebook computer, a mobile phone, an electronic organizer, a clock, and an information processing device such as a word processor. By employing the organic EL device according to the present invention for the display portion of such an electronic device, it is possible to provide an electronic device in which a short circuit caused by contact between the second electrodes is prevented, and to display a good emission life. It is possible to provide an electronic device including the unit.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of an organic EL device, a method of manufacturing the same, and an electronic apparatus according to the present invention will be described with reference to the drawings. In each of the drawings referred to, the scale may be different for each layer or each member in order to make the size recognizable in the drawings.
[0018]
(1st Embodiment)
1 to 3 are schematic diagrams schematically showing a passive matrix type organic EL (electroluminescence) display device according to the present embodiment. FIG. 1 is a plan view, and FIG. FIG. 3 is a configuration view, and FIG. 3 is a view taken along the line II ′ of FIG. As shown in these drawings, the present organic EL device 1 has a plurality of first electrodes (anodes) 3 extending in a band shape on a substrate 2 in a predetermined direction, and is orthogonal to the extending direction of the first electrodes. A plurality of cathode separators (separators) 4 extending in the direction, a bank layer 10 provided below the cathode separators 4, a second electrode (cathode) 5 formed between the cathode separators 4, and a first electrode. An organic functional layer 6 vertically sandwiched between the first electrode 3 and the second electrode 5 in an intersection region (light emitting region) A between the electrode 3 and the second electrode 5, a first electrode 3, a cathode separator 4, and a second electrode And a sealing portion 7 for can-sealing the organic functional layer 6 and the like as main components.
[0019]
In FIG. 2, B denotes a cathode separator forming region on the substrate 2 where the cathode separator 4 is formed. As shown in FIG. 2, near the one end Ba of the cathode separator forming region B, as shown in FIG. A plurality of connection portions 8a are formed so as to be sandwiched between the cathode separators 4 and closer to the center of the substrate than both ends of the cathode separator 4. The connection portion 8a forms a part of the connection terminal 8, and is directly connected to the second electrode. The cathode separator formation region B is a region where a plurality of cathode separators 4 are formed on the substrate 2, and more specifically, is the entire region where the cathode separators 4 and the space between the cathode separators 4 exist.
[0020]
The first electrode 3 and the connection terminal 8 extend so that one end 3 a of the first electrode 3 and one end 8 b of the connection terminal 8 are located outside the sealing portion 7. Is connected to a data-side driving circuit 100 including a shift register, a level shifter, a video line, and an analog switch. One end 8b of the connection terminal 8 is connected to a scanning-side driving circuit 101 including a shift register and a level shifter. Have been.
[0021]
As shown in FIG. 3, the organic functional layer 6 includes a light emitting layer 61 that emits light of a predetermined wavelength when a current flows through the first electrode 3 and the second electrode 5 sandwiching the organic function layer vertically. The organic EL device 1 has a function as a display device by providing a plurality of light emitting regions A in which an organic functional layer including the light emitting layer 61 is formed in a matrix. In the organic EL device 1 according to the present embodiment, the substrate 2 and the first electrode 3 have translucency, and the light emitted from the light emitting layer 61 is emitted from the substrate 2 side. ing. Further, the organic functional layer 6 is accommodated in a space surrounded by the side wall 10b of the bank layer, the first electrode 3 and the second electrode 5, as shown in the drawing. For this reason, it is possible to prevent the organic functional layer 6 from being deteriorated by moisture, air, or the like entering from the outside.
[0022]
Examples of the material of the light-transmitting substrate 2 include glass, quartz, resin (plastic, plastic film), and the like. In particular, an inexpensive soda glass substrate is suitably used. The first electrode 3 is formed of a light-transmitting conductive material made of a metal oxide such as indium tin oxide (ITO) or indium zinc oxide (IZO), and is shaped like a strip, and A plurality of each are formed at predetermined intervals. The first electrode 3 plays a role of injecting holes into the organic functional layer 6. The connection terminal 8 is formed of a conductive metal material, is formed in a rectangular shape, and is arranged such that its own end 8c is located between the cathode separators 4 as shown in the drawing. Have been.
[0023]
On the substrate 2 on which the first electrodes 3 and the connection terminals 8 are formed, an insulating film 9 made of a silicon oxide film (SiO ₂ ) is formed. The insulating film 9 is patterned so that the first electrode 3 in the light emitting region A, the vicinity of the end 3a of the first electrode 3, the connection portion 8a and the vicinity of the end 8b of the connection terminal 8 are exposed. The insulating film 9 is patterned so that the connecting portion 8a is located closer to the center of the substrate 2 than the end 4a of the cathode separator 4 (one end Ba of the cathode separator forming region B).
[0024]
The bank layer 10 is formed in the cathode separator formation region B on the insulating film 9 so that the connection portion 8a is not covered. The bank layer 10 is made of an organic material having excellent heat resistance and solvent resistance, such as an acrylic resin or a polyimide resin, and has an opening 10 a at a position corresponding to the light emitting region A. The thickness of the bank layer 10 is set smaller than the thickness of the cathode separator 4 and larger than the thickness of the organic functional layer 6.
[0025]
The cathode separator 4 formed on the bank layer 10 is formed of a photosensitive resin such as polyimide, and has a thickness of, for example, 6 μm, a cross section in the width direction having a reverse tapered shape, and each having a predetermined interval. Are formed at intervals. As shown in the drawing, the cathode separator 4 has a widthwise end 4b above the cathode separator 4 emitting light more than an end 10c (an end corresponding to the horizontal direction in FIG. 3) 10c of the opening 10a of the bank layer 10. It is formed so as to be located near the outside of the area A. The cathode separator 4 is made of, for example, a material different from the bank layer 10 so that the bank layer 10 is not etched when the cathode separator 4 is formed by the photolithography technique.
[0026]
The organic functional layer 6 is a laminate in which a hole injection / transport layer 62, a light emitting layer 61, and an electron injection / transport layer 63 are stacked, and is accommodated in the opening 10a of the bank layer 10. The hole injection / transport layer 62 is formed of, for example, a mixture of a polythiophene derivative such as polyethylene dioxythiophene and polystyrene sulfonic acid. The hole injection / transport layer 62 has a function of injecting holes into the light emitting layer 61 and a function of transporting holes inside the hole injection / transport layer 62.
[0027]
The light emitting layer 61 has three types of a red light emitting layer 61a that emits red (R) light, a green light emitting layer 61b that emits green light (G), and a blue light emitting layer 61c that emits blue light (B). 61a to 61c are arranged in a mosaic arrangement. Examples of the material of the light emitting layer 61 include anthracene, pyrene, 8-hydroxyquinoline aluminum, bisstyrylanthracene derivative, tetraphenylbutadiene derivative, coumarin derivative, oxadiazole derivative, distyrylbenzene derivative, pyrrolopyridine derivative, perinone derivative, A cyclopentadiene derivative, a thiadiazolopyridine derivative, or a low molecular weight material thereof can be used by doping rubrene, a quinacridone derivative, a phenoxazone derivative, DCM, DCJ, a perinone, a perylene derivative, a coumarin derivative, a diazaindacene derivative, or the like.
[0028]
The electron injection / transport layer 63 has a function of injecting electrons into the light emitting layer 61 and a function of transporting electrons inside the electron injection / transport layer 63. As the electron injection / transport layer 63, for example, lithium quinolinol, lithium fluoride, bathophen cesium, or the like can be suitably used. Further, metals having a work function of 4 eV or less, for example, Mg, Ca, Ba, Sr, Li, Na, Rb, Cs, Yb, and Sm can also be used.
[0029]
For the second electrode 5, for example, a metal film having a high reflectivity such as an Al film or an Ag film is used, and light emitted from the light emitting layer 61 to the second electrode 5 side is efficiently emitted to the substrate 2 side. It is made to let. The second electrode 5 is formed so as to cover the opening 10a of the bank layer 10. Note that a protective layer made of SiO, SiO ₂ , SiN, or the like for preventing oxidation may be provided on the second electrode 5 as needed.
[0030]
The sealing portion 7 includes a sealing resin 7a applied to the substrate 2 and a sealing can (sealing member) 7b. The sealing resin 7a is an adhesive for bonding the substrate 2 and the sealing can 7b, and is annularly applied around the substrate 2 by, for example, a microdispenser. The sealing resin 7a is made of a thermosetting resin or an ultraviolet curable resin, and is particularly preferably made of an epoxy resin which is a kind of the thermosetting resin. The sealing resin 7a is made of a material that does not easily pass oxygen or moisture, and prevents water or oxygen from entering between the substrate 2 and the sealing can 7b into the sealing can 7b. The oxidation of the electrode 5 or the light emitting layer 61 is prevented.
[0031]
The sealing can 7b is provided with a concave portion 7b1 for accommodating the first electrode 3, the organic functional layer 6, the second electrode 5, and the like inside the sealing can 7b, and is joined to the substrate 2 via the sealing resin 7a. A getter material for absorbing or removing oxygen or moisture can be provided on the inner surface side of the sealing can 7b outside the cathode separator formation region B, if necessary. Examples of the getter material include alkali metals such as Li, Na, Rb, and Cs; alkaline earth metals such as Be, Mg, Ca, Sr, and Ba; oxides of alkaline earth metals; alkali metals; A metal hydroxide or the like can be suitably used. The alkaline earth metal oxide reacts with water to change to a hydroxide, thereby acting as a dehydrating material. Alkali metals and alkaline earth metals react with oxygen to change to hydroxides and to react with water to change to oxides, so they act not only as dehydrating materials but also as deoxidizing materials. Thereby, oxidation of the organic functional layer 6 and the like can be prevented, and the reliability of the device can be improved.
[0032]
Next, a method for manufacturing the organic EL device 1 of the present embodiment will be described with reference to the drawings. The method for manufacturing the organic EL device 1 of the present embodiment includes, for example, (1) a first electrode forming step, (2) an insulating film forming step, (3) a bank layer forming step, (4) a cathode separator forming step, and (5) ) Plasma treatment step, (6) hole injection / transport layer forming step, (7) light emitting layer forming step, (8) electron injection / transport layer forming step, (9) second electrode forming step, and (10) sealing. And a process. The manufacturing method is not limited to this, and other steps may be omitted or added as necessary.
[0033]
(1) First Electrode Forming Step The first electrode forming step is a step of forming a plurality of first electrodes 3 extending in a belt shape in a predetermined direction on the substrate 2. In the first electrode forming step, as shown in FIGS. 4A and 4B, a plurality of first electrodes 3 made of a metal oxide such as ITO or IZO are formed on the substrate 2 by sputtering. As a result, a plurality of strip-shaped first electrodes 3 are formed at predetermined intervals, and one end 3 a (upper side in FIG. 4A) is formed so as to reach the end 2 a of the substrate 2. Have been. Note that the connection terminals 8 are also formed in the first electrode forming step. The connection terminal 8 is formed such that one end 8b reaches the end 2b of the substrate 2 and the other end 8c is located closer to the center of the substrate 2 than the end Ba of the bank formation region B, as shown in the drawing. Is done.
[0034]
(2) Insulating Film Forming Step As shown in FIGS. 5A and 5B, the insulating film forming step includes the first electrode 3 in the light emitting region A, the vicinity of the end 3a of the first electrode 3, the connecting portion 8a, In this step, an insulating film 9 patterned so as to expose the vicinity of the end 8b of the connection terminal 8 is formed on the substrate 2, the first electrode 3, and the connection terminal 8. In this insulating film forming step, the insulating film 9 is formed by a plasma CVD method using tetraethoxysilane, oxygen gas or the like as a raw material. The insulating film 9 is patterned so that the connection portion 8a is located closer to the center of the substrate 2 than the end Ba of the cathode separator formation region B.
[0035]
(3) Bank Layer Forming Step In the bank layer forming step, as shown in FIGS. 6A and 6B, an opening 10a is formed at a position that does not cover the connection portion 8a and that corresponds to the light emitting region A. This is a step of forming the formed bank layer 10 in the cathode separator formation region B. In this bank layer forming step, a heat-resistant and solvent-resistant photosensitive material (organic material) such as an acrylic resin or a polyimide resin is applied to the organic functional layer on the substrate on which the first electrode 3 and the insulating film 9 are formed. 6 and not more than the thickness of the cathode separator 4, and an opening 10a is formed at a position corresponding to the light emitting region A by a photolithography technique.
[0036]
(4) Cathode Separator Forming Step As shown in FIGS. 7A and 7B, the cathode separator forming step includes a plurality of cathodes extending in a band shape in a direction orthogonal to the extending direction of the first electrode 3. This is a step of forming the separators 4 at predetermined intervals. In this cathode separator forming step, first, a photosensitive resin such as polyimide is applied on the substrate 2 to a predetermined thickness by spin coating or the like. Then, by etching the photosensitive resin such as polyimide applied with the predetermined thickness by a photolithography technique, the cathode separator 4 whose cross section in the width direction is set to have an inversely tapered shape is formed in the cathode separator formation region B. Form multiple. Note that such a cathode separator 4 has a connection portion 8 a located between the cathode separators 4, and the end 4 b in the width direction of the cathode separator 4 has a larger emission area A than the end 10 c of the bank layer 10. It is formed so as to be located on the outer side.
[0037]
(5) Plasma Processing Step The plasma processing step is performed for the purpose of activating the surface of the first electrode 3 and further performing the surface treatment on the surfaces of the bank layer 10 and the cathode separator 4. Specifically, as is well known, first, by performing O ₂ plasma treatment, cleaning of the exposed first electrode 3 (ITO) and adjustment of the work function are performed, and the surface of the bank layer 10 is exposed. The surface of the first electrode 3 and the surface of the cathode separator 4 become lyophilic. Subsequently, the surfaces of the bank layer 10 and the cathode separator 4 are made lyophobic by performing CF ₄ plasma treatment.
[0038]
(6) Hole Injection / Transport Layer Formation Step In the hole injection / transport layer formation step, the hole injection / transport layer 62 is discharged onto the exposed first electrode 3, that is, into the opening 10 a of the bank layer 10. This is a step of forming by a method. In the hole injection / transport layer forming step, the hole injection / transport layer material is discharged onto the first electrode 3 by using, for example, an ink jet device. Thereafter, a hole injection / transport layer 62 as shown in FIGS. 8A and 8B is formed on the first electrode 3 by performing a drying process and a heat treatment.
[0039]
This ink jet apparatus discharges a material whose liquid amount per droplet is controlled from a discharge nozzle provided in an ink jet head, makes the discharge nozzle face a discharge surface, and further moves the discharge nozzle and the substrate 2 relatively. Discharges the material onto the discharge surface. At this time, since the surface of the bank layer 10 is made lyophobic by the above-described plasma processing step, even if the material discharged from the discharge nozzle adheres to the upper surface of the bank layer or the like, the material is surely formed on the bank layer 10 It enters the opening 10a.
[0040]
(7) Light Emitting Layer Forming Step As shown in FIGS. 9A, 9B, 10A, and 10B, the light emitting layer forming step includes the step of injecting / forming holes formed on the first electrode 3. This is a step of forming the light emitting layer 61 made of a low molecular material on the transport layer 62. In this light emitting layer forming step, first, a blue light emitting layer material is discharged into the opening 10a of the bank layer 10 corresponding to the blue light emitting region Ac by, for example, a droplet discharging method using an ink jet device, thereby obtaining the light emitting layer shown in FIG. A blue light emitting layer 61c as shown in FIGS. Subsequently, a red light emitting layer 61a is formed by discharging a red light emitting layer material into the opening 10a of the bank layer 10 corresponding to the red light emitting region Aa, and the opening 10a of the bank layer 10 corresponding to the green light emitting region Ab. The green light emitting layer material is discharged to form a green light emitting layer 61b (see FIGS. 10A and 10B).
[0041]
(8) Electron Injection / Transport Layer Formation Step The electron injection / transport layer formation step is a step of forming the electron injection / transport layer 63 on the light emitting layer 61 as shown in FIGS. 11 (a) and 11 (b). . In the electron injection / transport layer formation step, the electron injection / transport layer 63 is formed by discharging the electron injection / transport layer material onto the light emitting layer 61 by, for example, a droplet discharge method using an inkjet device. In addition, the process which combined the hole injection / transport layer formation process, the light emitting layer formation process, and the electron injection / transport layer formation process is an organic functional layer formation process.
[0042]
As described above, the organic functional layer 6, which is a laminate of the hole injection / transport layer 62, the light emitting layer 61, and the electron injection / transport layer 63, has the material whose opening is formed in the bank layer 10 by the droplet discharge method. It is formed by being discharged into 10a. For this reason, it is possible to prevent the organic functional layer 6 from rising along the side surface of the cathode separator 4.
[0043]
(9) Second Electrode Forming Step The second electrode forming step is a step of forming the second electrode 5 between the adjacent cathode separators 4 as shown in FIGS. 12A and 12B. In the second electrode forming step, the second electrode material is applied to the entire surface of the cathode separator forming region B on the surface of the substrate 2 through a vapor deposition mask having a single opening X1 having the same shape as the shape of the cathode separator forming region B. Deposited vertically. Here, as described above, the end 4b in the width direction above the cathode separator 4 is arranged closer to the outside of the light emitting region A than the end 10c of the opening 10a of the bank layer 10. Therefore, by depositing the second electrode material from the direction perpendicular to the surface of the substrate 2, the second electrode 5 can be easily formed so as to cover the opening 10 a of the bank layer 10 as shown in the figure. Become. As a result, the organic functional layer 6 is accommodated in a space surrounded by the side surface 10 b of the opening 10 a of the bank layer 10, the first electrode 3 and the second electrode 5. Therefore, since the organic functional layer 6 can be protected from moisture, air, and the like that have entered from the outside, deterioration of the organic functional layer 6 can be prevented, and as a result, a good light emission life can be obtained.
[0044]
Further, since the connection portion 8a is located closer to the center of the substrate 2 than the cathode separator formation region B, the second electrode material is also formed on the connection portion 8a by the above-described second electrode formation step using the evaporation mask X. Deposited. As a result, the connecting portion 8a and the second electrode 5 are directly connected by the second electrode forming step. As described above, since the connecting portion 8a is located between the cathode separators 4, the second electrode 5 and the connecting portion 8a can be connected only by the second electrode forming step.
[0045]
(10) Sealing Step Lastly, the substrate 2 on which the first electrode 3, the organic functional layer 6, the second electrode 5, and the like are formed by the above-described steps and the sealing can 7b are sealed via the sealing resin 7a. I do. For example, a sealing resin 7a made of a thermosetting resin or an ultraviolet curing resin is applied to the peripheral edge of the substrate 2, and a sealing can 7b is arranged on the sealing resin (see FIG. 3). The sealing step is preferably performed in an atmosphere of an inert gas such as nitrogen, argon, and helium. When performed in the air, when a defect such as a pinhole occurs in the second electrode 5, water, oxygen, or the like may enter the second electrode 5 from the defective portion and oxidize the second electrode 5. It is not preferred.
[0046]
Thereafter, the data-side driving circuit 100 provided on the substrate 2 or outside is connected to the first electrode 3, and the scanning-side driving circuit 101 provided on the substrate 2 or outside is connected to the second electrode 5. By doing so, the organic EL device 1 of the present embodiment is completed.
[0047]
According to such an organic EL device 1, since the organic functional layer does not rise along the side surface of the cathode separator 4, it is possible to provide an organic EL device in which a short circuit caused by contact between the second electrodes is prevented. In addition, since the organic functional layer 6 is accommodated in the space surrounded by the first electrode 3, the second electrode 5, and the bank layer 10b, it is possible to provide an organic EL device having a good emission life. It becomes possible.
[0048]
In the above embodiment, a low molecular material is used for the light emitting layer 61, but a high molecular material may be used. In addition, as a polymer-based light emitting layer material, (poly) paraphenylene vinylene derivative, polyphenylene derivative, polyfluorene derivative, polyvinyl carbazole, polythiophene derivative, perylene dye, coumarin dye, rhodamine dye, or a polymer of these polymers The material can be doped with rubrene, perylene, 9,10-diphenylanthracene, tetraphenylbutadiene, Nile Red, coumarin 6, quinacridone, or the like.
[0049]
(2nd Embodiment)
Next, a second embodiment of the present organic EL device will be described with reference to FIG. In the first embodiment, the bank layer 10 is formed below the cathode separator 4, whereas in the present embodiment, as shown in FIG. 13, the bank layer 10 and the cathode separator 4 are respectively formed on the insulating film 9. Is formed. When manufacturing such an organic EL device 1, first, a bank layer material is applied, and thereafter, an opening 10a is formed in the light emitting region A and the space C where the cathode separator 4 is formed. Then, the formation space C of the cathode separator 4 is formed. In the organic EL device 1 configured as described above, the same effects as in the first embodiment can be obtained.
[0050]
(Third embodiment)
Next, a third embodiment of the present organic EL device will be described with reference to FIG. In the first embodiment, the light emitted from the organic functional layer 6 is emitted from the substrate 2 side, whereas in the present embodiment, the light is emitted above the sealing can 7b. ing. The difference between the present embodiment and the first embodiment is mainly the material configuration. In the present embodiment, the portions different from the first embodiment will be described.
[0051]
In the present embodiment, light emission is extracted from the sealing portion 7 side, which is the opposite side of the substrate 2, so that either a transparent substrate or an opaque substrate can be used as the substrate 2. Examples of the opaque substrate include a thermosetting resin, a thermoplastic resin, and the like, in addition to a ceramic sheet such as alumina or a metal sheet such as stainless steel subjected to an insulation treatment such as surface oxidation.
[0052]
Further, the first electrode 3 is not necessarily limited to a transparent material, but a suitable material that satisfies the function of an anode is used. A material having light reflectivity is preferable, and Al or the like is used. In the case where a transparent metal such as ITO is used as the first electrode 3, a configuration in which an Al thin film or the like is formed therebelow and has light reflectivity is preferable.
[0053]
The material of the second electrode 5 needs to have transparency, and a transparent metal such as ITO is used. Here, an Al thin film having a thickness having transparency may be formed between the ITO and the electron injection / transport layer 63. The thickness having transparency is preferably 50 nm or less. By forming such an Al thin film, not only the electron injection property to the electron injection / transport layer 63 is promoted, but also plasma damage at the time of forming ITO by sputtering is suppressed, and the second electrode 5 is formed. The organic functional layer 6 can be protected from permeation and penetration of moisture and oxygen. Further, as a material of the sealing can 7b, a suitable material having transparency is adopted.
[0054]
In the organic EL device configured as described above, the same effects as those of the first embodiment can be obtained, and the organic functional layer 6 can emit light from the sealing portion 7 side.
[0055]
(Fourth embodiment)
FIG. 14 shows an embodiment of the electronic apparatus of the present invention. The electronic apparatus of the present embodiment includes the above-described organic EL device 1 as a display unit. FIG. 14 is a perspective view showing an example of a mobile phone, in which reference numeral 1000 denotes a mobile phone main body, and reference numeral 1001 denotes a display unit using the organic EL device 1 described above. As described above, since the electronic apparatus according to the present invention is equipped with the organic EL device 1 that reliably prevents the short circuit caused by the contact between the second electrodes outside the separator formation region, for example, the manufacturing cost is reduced. It is possible to do.
[0056]
As described above, each embodiment of the present invention has been described, but the present invention is not limited thereto, and can be appropriately changed within the scope of matters described in the claims. The effects of the present invention can be achieved for each of those appropriately changed within the scope of the matters described in the claims.
[Brief description of the drawings]
FIG. 1 is a plan view of an organic EL device according to the present invention.
FIG. 2 is an internal configuration diagram of the organic EL device of the present invention.
FIG. 3 is a view taken along the line II ′ in FIG. 1;
FIG. 4 is an explanatory diagram for explaining a method for manufacturing an organic EL device.
FIG. 5 is an explanatory diagram for explaining the method for manufacturing the organic EL device.
FIG. 6 is an explanatory diagram for explaining the method for manufacturing the organic EL device.
FIG. 7 is an explanatory diagram for explaining the method for manufacturing the organic EL device.
FIG. 8 is an explanatory diagram for explaining the method for manufacturing the organic EL device.
FIG. 9 is an explanatory diagram for explaining the method for manufacturing the organic EL device.
FIG. 10 is an explanatory diagram for explaining the method for manufacturing the organic EL device.
FIG. 11 is an explanatory diagram for explaining the method for manufacturing the organic EL device.
FIG. 12 is an explanatory diagram for explaining the method for manufacturing the organic EL device.
FIG. 13 is an explanatory diagram for explaining a second embodiment of the present invention.
FIG. 14 is an exemplary perspective view showing an embodiment of an electronic apparatus of the invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Organic EL device, 2 ... Substrate, 3 ... 1st electrode, 4 ... Cathode separator (separator), 5 ... 2nd electrode, 6 ... Organic functional layer, 7 ... Sealing part, 8 ... Connection terminal, 9... Insulating film, 10... Bank layer, 10a... Opening, A... Light emitting region, B.

Claims (12)

A plurality of first electrodes formed on the substrate, a plurality of separators extending in a strip shape in a direction intersecting the first electrodes, and separating the second electrodes, and formed between the separators; An organic EL device comprising: a second electrode; and an organic functional layer formed between the first electrode and the second electrode in an intersection region between the first electrode and the second electrode,
An organic EL device, comprising: a bank layer having an opening corresponding to an intersecting region between a first electrode and a second electrode; wherein the organic functional layer is formed inside the opening of the bank layer. The organic EL device according to claim 1, wherein the second electrode is formed so as to cover an opening formed in the bank layer. 3. The organic EL device according to claim 1, wherein the thickness of the bank layer is equal to or greater than the thickness of the organic functional layer. The organic EL device according to claim 1, wherein the separator has an inverted tapered shape. An electronic apparatus comprising the organic EL device according to claim 1 as a display device. A method for manufacturing an organic EL device in which an organic functional layer is formed between electrodes,
Forming a plurality of first electrodes on the substrate;
Forming a bank layer having an opening corresponding to the intersection region;
Forming a plurality of separators for separating the second electrode;
Forming an organic functional layer inside the opening of the bank layer;
Forming a second electrode between the separators. In the step of forming the organic functional layer, the organic functional layer is formed by subjecting the organic functional layer material attached to the inside of the opening of the bank layer to a predetermined treatment by a droplet discharge method. The method for manufacturing an organic EL device according to claim 6, wherein 8. The method according to claim 6, wherein in the step of forming the bank layer, the bank layer is formed thicker than the thickness of the organic functional layer. 9. The method of manufacturing an organic EL device according to claim 6, wherein in the step of forming the separator, the separator is formed in a reverse tapered shape. 10. The organic EL device according to claim 9, wherein in the step of forming the second electrode, the second electrode is formed by depositing a second electrode material in a direction perpendicular to a substrate surface. Method. The method for manufacturing an organic EL device according to any one of claims 6 to 10, further comprising, before the step of forming the organic functional layer, a step of imparting liquid repellency to the surface of the bank layer or the bank layer and the separator. 12. The organic EL device according to claim 6, further comprising, before the step of forming the organic functional layer, a step of imparting lyophilicity to the surface of the substrate exposed at the opening of the bank layer. Production method.

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