JP2010061822A - Method of manufacturing organic el device - Google Patents

Abstract

An object of the present invention is to provide a method for manufacturing an organic EL device having a host material and a guest material, which can prevent uneven material in a light emitting layer.
A method of manufacturing an organic EL device in which a light emitting layer is sandwiched between a first electrode and a second electrode, wherein the organic EL device is erected on a substrate along a peripheral portion of the first electrode. A partition layer 20 to be formed, a step of depositing a host material hardly soluble in a solvent in a region surrounded by the partition layer 20, and a region surrounded by the partition layer 20 A step of disposing a material liquid 32 in which a soluble guest material is dissolved in a solvent; a material liquid 32 that penetrates the material film 31 of the host material; and the host material is dispersed in the material liquid 32 and the solvent in the material liquid 32 Forming a light emitting layer in which the host material and the guest material are mixed in a region surrounded by the partition wall layer 20.
[Selection] Figure 3

Description

  The present invention relates to a method for manufacturing an organic EL device.

  In recent years, organic EL devices using organic EL (electroluminescence) elements as pixels have been developed. In the organic EL device, a technique using a host material and a guest material (light emitting dopant) as a material structure of the light emitting layer is known in order to increase the efficiency of light emission, change the light emission color, and extend the lifetime (see FIG. Patent Document 1).

Here, the meanings / features of “host material” and “guest material” are described below.
(1) The host material is a material that can flow both holes and electrons.
(2) In the organic EL device in which the guest material is not used in the light emitting layer, light emission from the host material is observed, but when the guest material and the host material are used in combination, light emission from the host material is almost observed. The guest material mainly emits light.
(3) The spectrum of EL emission observed in an organic EL device using both a host material and a guest material is fluorescence or phosphorescence at the emission center in the guest material. The luminescence center here refers to a part of the guest material and means an organic molecular skeleton capable of emitting strong fluorescence / phosphorescence.
JP 2000-281663 A

  In general, many organic light-emitting materials have a π-conjugated system and thus have increased rigidity and low solubility in a solvent. Many metal complexes used as organic light-emitting materials have low solubility in solvents. Therefore, these materials are formed by a vapor deposition method using resistance heating.

  On the other hand, there are cases where the solubility of these materials is improved and applied to wet processes such as an ink jet method and a spin coat method. Patent Document 1 proposes a material that can be applied to a wet process by modifying the material with an alkyl chain in order to improve solubility. For example, the inkjet method uses less material than the vapor deposition method, and is particularly suitable for forming a guest material containing a large amount of rare metal such as platinum or iridium. In addition, precise alignment of the metal mask is not required, and high-definition RGB color separation is possible.

  However, when the host material and guest material are converted into ink with a single solvent, and this is ejected by an ink jet method to form a film, the timing of precipitation does not match due to the difference in solubility of each component, and the host material and guest material are uniform. There is a problem that dispersion is hindered. In addition, when a host material with low solubility is used, the concentration of the host material in the ink cannot be increased, and it is necessary to perform inkjet discharge a plurality of times, resulting in poor production efficiency.

  The present invention has been made in view of such circumstances, and in a method for manufacturing an organic EL device having a host material and a guest material, a manufacturing method capable of preventing the unevenness of the material in the light emitting layer is provided. The purpose is to do.

In order to solve the above problems, a method for manufacturing an organic EL device according to the present invention is a method for manufacturing an organic EL device in which a light emitting layer is sandwiched between a first electrode and a second electrode. A step of forming a partition layer standing along the periphery of the first electrode, a step of depositing a host material that is sparingly soluble in a solvent in a region surrounded by the partition layer, and the partition layer A material solution in which a guest material that is easily soluble in the solvent is dissolved in the solvent, and the material solution is infiltrated into a material film of the host material. Forming the light emitting layer in which the host material and the guest material are mixed in a region surrounded by the partition layer by removing the solvent in the material liquid while dispersing the host material in It is characterized by having.
According to this manufacturing method, since the material liquid in which the guest material that is easily soluble in the solvent is disposed on the host material that is hardly soluble in the solvent, the host material and the guest material are the same. Compared with the case of dissolving in a solvent and coating on a substrate, the problem of segregation can be avoided, and a uniform dispersion state of the host material and the guest material can be realized. Therefore, a light emitting layer in which the host material and the guest material are uniformly mixed can be obtained, and an organic EL device having a longer lifetime and improved light emission characteristics as a product can be provided. In general, when a material is modified with an alkyl chain or the like to improve solubility and applied to a wet process, the thermal stability of the material is often lowered and the charge transportability is often lowered. Since it is not necessary to modify the alkyl group or the like in order to impart solubility to the material, it is possible to avoid a decrease in light emission characteristics.

In the present manufacturing method, it is desirable that the material liquid is selectively discharged to a region surrounded by the partition wall by an ink jet method.
According to this manufacturing method, since the guest material is discharged using a droplet discharge method, for example, the amount of a material containing rare and expensive platinum or iridium used as the guest material can be significantly reduced. it can. As a result, it is possible to manufacture an organic EL device having a longer life as a product and having improved light emission characteristics at a low cost.

In this manufacturing method, in the step of depositing the host material, it is desirable that a guest material different from the guest material and hardly soluble in the solvent is deposited together with the host material.
According to this manufacturing method, an organic EL device having excellent light emission characteristics can be provided by using a plurality of types of guest materials. In this case, since only one type of guest material is dissolved in the solvent, and other guest materials are formed by vapor deposition, the guest due to the difference in solubility is compared to the case where a plurality of guest materials are dissolved and applied in the same solvent. Segregation of the material can be prevented, and uniform dispersion can be realized.

In this production method, in the step of forming the light emitting layer, the material liquid is heated in a temperature range equal to or lower than the boiling point of the solvent to cause convection in the material liquid. It is desirable to disperse in.
According to this manufacturing method, convection can be caused in the material liquid that has penetrated into the material film of the host material, and the dispersion of the host material into the material liquid can be further promoted, so that the host material and the guest material are more uniform. It is possible to obtain a light emitting layer mixed with the light emitting layer.

In the present manufacturing method, in the step of forming the light emitting layer, the solvent in the liquid is evaporated in a vacuum atmosphere to cause convection in the liquid, thereby dispersing the host material in the liquid. It is desirable to make it.
According to this manufacturing method, convection occurs in the material liquid as the solvent evaporates, so that a light emitting layer in which the first material and the second material are uniformly mixed can be obtained more efficiently.

  Embodiments of the present invention will be described below with reference to the drawings. This embodiment shows one aspect of the present invention, and does not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention. Moreover, in the following drawings, in order to make each structure easy to understand, an actual structure and a scale, a number, and the like in each structure are different.

  FIG. 1 is an enlarged plan view of the periphery of a subpixel X included in an organic EL device 1 which is an embodiment of the organic EL device of the present invention. The organic EL device 1 includes a plurality of sub-pixels X that are substantially rectangular in plan view. A partition wall layer 20 having a lattice shape in plan view is formed so as to surround each of the sub-pixels X.

  FIG. 2 shows a cross-sectional configuration along the line AA shown in FIG. The organic EL device 1 includes a substrate 10, a first electrode 11 as a pixel electrode formed on the substrate 10, a partition layer 20 having an opening overlapping the first electrode 11 in a plane, The light emitting layer 33 formed in the enclosed area | region and the 2nd electrode 12 as a common electrode formed covering the partition layer 20 and the light emitting layer 33 on the board | substrate 10 are provided.

  Although only the light emitting layer 33 is shown in FIG. 2, a hole injection layer and a hole transport layer are actually provided between the light emitting layer 33 and the first electrode 11 as necessary. Further, an electron injection layer and an electron transport layer are provided between the light emitting layer 33 and the second electrode 12 as necessary. A functional layer is formed by a hole injection layer, a hole transport layer, a light emitting layer 33, an electron transport layer, an electron injection layer, and the like provided between the first electrode 11 and the second electrode 12, and the first layer The electrode 11, the functional layer, and the second electrode 12 form an organic EL element (light emitting element) 5. The organic EL device 1 of the present embodiment employs a bottom emission method in which light generated by the organic EL element 5 is emitted to the substrate 10 side (lower side).

  The substrate 10 is made of an insulating material such as transparent glass or plastic, and a plurality of organic EL elements 5 are formed on the upper surface thereof. The organic EL element 5 has a light emitting layer 33 between the first electrode 11 and the second electrode 12 and causes the light emitting layer 33 to emit light upon receiving electric energy. The light emitting layer 33 is classified into three types according to the emission color, and includes, for example, a light emitting layer 33R that generates red light, a light emitting layer 33G that generates green light, and a light emitting layer 33B that generates blue light. is doing. On the substrate 10, a plurality of organic EL elements 5 having these three types of light emitting layers are regularly arranged in a matrix. Thereby, the light emitted from the light emitting layers 33R, 33G, and 33B is transmitted through the substrate 10 and emitted to the viewer side as each color light of red light, green light, and blue light.

  Note that a plurality of thin film transistors (TFTs) and various wirings corresponding to the plurality of organic EL elements 5 on a one-to-one basis are formed on the substrate 10, but these are not shown in FIG. .

  An insulating partition layer 20 is formed on the substrate 10. The partition layer 20 includes a first partition layer 21 having an opening that overlaps the first electrode 11 in a plan view, and a second partition layer 22 standing on the first partition layer 21. These organic EL elements 5 are separated separately. The substrate 10 and the partition wall layer 20 form a recess, and the organic EL element 5 occupies the bottom of the recess.

  The organic EL element 5 includes a first electrode 11 and a second electrode 12 that sandwich the light emitting layer 33. The first electrode 11 and the second electrode 12 are electrodes for injecting holes and electrons into the light emitting layer 33 and generate an electric field by the supplied electric energy. The first electrode 11 is an electrode made of ITO (Indium Tin Oxide) with a high hole injection property, and is formed on the substrate 10 and connected to a TFT corresponding to the above wiring.

A first partition layer 21 is formed on the substrate 10 so that a part of the first partition 11 runs over the end of the first electrode 11. The first partition layer 21 has an opening corresponding to the first electrode 11, and the first electrode 11 is exposed in this opening. The first partition layer 21 is formed so as to be lyophilic with a material liquid 32 in which a guest material described later is dissolved in a solvent 40. For example, SiO ₂ (silicon oxide), SiN (silicon nitride), SiON ( It is made of an insulating inorganic material such as silicon oxynitride.

On the first partition layer 21, a second partition layer 22 is erected at a position surrounding the periphery of the first electrode 11. The second partition layer 22 is formed so as to exhibit liquid repellency to a material liquid to be described later. For example, a fluorine-containing resin, or a photocurable acrylic resin or polyimide whose surface has been subjected to liquid repellency by CF ₄ plasma treatment. It is made of an insulating organic material such as resin.

  The surface exposed to the bottom surface of the region surrounded by the second partition layer 22 (here, the first electrode 11 and a part of the first partition layer 21) facilitates the injection of holes from the first electrode 11. For this purpose, a hole injection layer (not shown) is formed. For example, polythiophene, polyaniline, or polypyrrole can be used as the material for forming the hole injection layer. Also, PEDOT / PSS (3,4-polyethylenediothiophene / polystyrene sulfonic acid), those obtained by adding a glycol solvent such as ethylene glycol or diethylene glycol to these, those obtained by adding an ether solvent to PEDOT / PSS, You may use what vapor-deposited CuPC (copper phthalocyanine).

  A hole transport layer (not shown) for transporting holes injected from the first electrode 11 to the light emitting layer 33 is formed on the hole injection layer. The material for forming the hole transport layer is, for example, PF (polyfluorene derivative), PPV (paraphenylene vinylene derivative), PPP (polyparaphenylene derivative), PVK (polyvinylcarbazole), polythiophene derivative, PMPS (polymethylphenylsilane). A polysilane-based polymer organic material such as, for example, can be used.

  A light emitting layer 33 is formed on the hole transport layer. The light emitting layer 33 includes a host material 31 </ b> A that is hardly soluble in the solvent 40 and a guest material that is easily soluble in the solvent 40. The light emitting layer 33 is formed by discharging a liquid material liquid 32 in which a guest material is dissolved onto a material film 31 of a poorly soluble host material 31A formed by vapor deposition. By dispersing the host material 31A in the material liquid 32, a uniform dispersion state is realized as compared with the case where the host material 31A and the guest material are dissolved and applied in the same solvent.

As the host material 31A, for example, CBP (4,4′-N, N′-dicarbazole-biphenyl) or a derivative thereof can be used as a material that can be used for each color light emitting layer 33R, 33G, 33B or white light emitting layer. Examples of usable materials for the red light emitting layer 33R and the green light emitting layer 33G include quinolinol complexes such as Alq ₃ (aluminum quinolinol), TPD (triphenyldiamine derivative), TAZ (triazole derivative), oxadiazole. , BCP (Basocproin).

  Examples of guest materials that emit fluorescence include perylene, coumarin derivatives, and quinacridone. Examples of phosphorescent materials include PtOEP (2,3,7,8,12,13,17,18-octaethyl-21H, 23H-platinum (II) porphyrin: platinum porphyrin complex), Ir (ppy) 3, iridium complexes such as FIrpic, Bt2Ir (acac), Btp2Ir (acac) and their derivatives.

  As the solvent 40 for dissolving the guest material, it is preferable to select a solvent that is hardly soluble in the material film 31 of the host material 31A, and specifically has a maximum solubility of 0.2 wt% at room temperature. Examples of the solvent include hydrocarbon solvents such as toluene, xylene, trimethylbenzene, tetralin, dichlorobenzene, trichlorobenzene, dimethylamide, and anisole. In this embodiment, anisole, tetralin, and trimethylbenzene having a particularly high boiling point are used.

  On the light emitting layer 33, an electron injecting and transporting layer for injecting and transporting electrons supplied from the second electrode 12 to the light emitting layer 33 is formed. Examples of the material for forming the electron injecting and transporting layer include oxadiazole derivatives, oxazole derivatives, phenanthoroline derivatives, anthraquinodimethane derivatives, benzoquinone derivatives, naphthoquinone derivatives, anthraquinone derivatives, tetracyanoanthraquinodimethane derivatives, fluorenone derivatives, diphenyldicyano. Ethylene derivatives, diphenoxin derivatives, and hydroxyquinoline derivatives can be used.

  Further, if necessary, a hole blocking layer may be formed between the light emitting layer 33 and the electron injecting and transporting layer. Examples of the material for forming the hole blocking layer include BCP, OXD-1 (1,3-bis (4-t-butylphenyl-1,3,4-oxadizolyl) biphenylin), PBD (oxydiazole derivative), Alq3. , TAZ, DPVBi (4,4′-bis (2,2-diphenylvinyl) biphenyl), BND (2,5-bis (1-naphthyl) -1,3,4-oxadiazole), BBD (2, 5-bis (4-biphenylyl) -1,3,4-oxadiazole) can be used. By forming this hole blocking layer, it is possible to prevent holes from passing through to the electron injecting and transporting layer side and to promote light emission in the light emitting layer 33.

  The second electrode 12 is formed so as to cover the entire portion of the light emitting layer 33, the material film 31, and the partition wall layer 20 exposed on the substrate 10. The second electrode 12 functions as a common electrode common to the organic EL elements 5. For example, the second electrode 12 is formed by laminating a LiF (lithium fluoride) layer, a Ca (calcium) layer, and an Al (aluminum) layer.

(Method for manufacturing organic EL device)
Next, a process for manufacturing the organic EL device 1 will be described with reference to the drawings. 3 to 5 are cross-sectional process diagrams illustrating an example of a method for manufacturing the organic EL device 1.

First, as shown in FIG. 3A, the first electrode 11 and the partition layer 20 are formed on the substrate 10 using a known technique, and the first electrode 11 surrounded by the partition layer 20 is formed. In the region, a hole injection layer and a hole transport layer (not shown) are formed by a wet film formation method such as an inkjet method or a spin coating method. Then, the material film 31 of the host material 31A is formed on the hole transport layer by vapor deposition. As the host material 31A, a material hardly soluble in the solvent used in FIG. The material film 31 of the host material 31 </ b> A may be selectively formed in a region surrounded by the partition layer 20, or may be formed on the entire surface of the substrate including the upper surface of the partition layer 20. In the present embodiment, as the host material 31A, the host material 31A common to the red light emitting layer 33R, the green light emitting layer 33G, and the blue light emitting layer 33B is used, and the entire part exposed on the substrate of the partition layer 20 and the hole transport layer is formed. A film is formed so as to cover it. By doing so, a vapor deposition mask is not required, and the organic EL element 5 that is separately applied to red, green, and blue can be formed with high accuracy and efficiency.

  Next, as shown in FIGS. 3B and 3C, a material liquid 32 in which a guest material is dissolved in a region surrounded by the partition wall layer 20 by a droplet discharge method such as an inkjet method is used. Discharge. More specifically, the red material liquid 32R, the green material liquid 32G, and the blue material liquid 32B corresponding to each color light emitting layer are supplied from the droplet discharge head 301 to the corresponding red subpixel, green subpixel, and blue subpixel. Are selectively discharged.

  Here, only one kind of guest material is dissolved in the material liquid 32. For the red material liquid, the green material liquid, and the blue material liquid, one type of red guest material, green guest material, and blue guest material are selected and dissolved in the solvent. By not dissolving a plurality of guest materials, it is possible to prevent segregation due to a difference in solubility of each material.

  The material liquid 32 is repelled by the wall of the second partition layer because the second partition layer 22 has liquid repellency. Thereby, the arrange | positioned material liquid 32 becomes a shape where the center part undulates rather than the edge part. In order to prevent mixing with adjacent sub-pixels, the height of the partition wall layer 20 (the upper surface portion of the second partition wall layer) is higher than the height of the portion of the material liquid 32 that protrudes most from the substrate. desirable.

  Next, as shown in FIG. 4A, the material liquid 32 is infiltrated into the material film 31 to disperse the host material 31 </ b> A in the material liquid 32. When the material liquid 32 is discharged onto the material film 31, the material liquid 32 penetrates into the material film 31, and the material film 31 cannot maintain its shape, and the host material peeled off from the material film 31. 31A is dispersed in the material liquid 32.

  Next, as shown in FIG. 4B, the dispersion of the host material 31A is promoted by heating the substrate 10 or heating the atmosphere. Here, the heating is performed in a temperature range below the boiling point of the solvent of the material liquid 32. Then, the host material 31A is uniformly dispersed in the material liquid 32 in which the guest material is dissolved.

  Next, as shown in FIG. 4C, the atmosphere 40 is evacuated and the solvent 40 of the material liquid 32 in which the host material 31A is dispersed is removed. Alternatively, the solvent 40 may be removed by heating the substrate 10 or heating the atmosphere. Here, the heating is performed in a temperature range below the boiling point of the solvent of the material liquid 32. At this time, the host material 31 </ b> A starts to settle while taking in the guest material, and is gradually laminated as a material for forming the light emitting layer 33. More specifically, the host material 31A takes in the guest material in the red material liquid 32R and becomes a material for forming the red light emitting layer 33R. The host material 31A takes in the guest material in the green material liquid 32G and becomes a material for forming the green light emitting layer 33G. The host material 31A takes in the guest material in the blue material liquid 32B and becomes a material for forming the blue light emitting layer 33B.

  Next, as shown in FIG. 5A, the atmosphere is further evacuated and the solvent 40 of the material liquid 32 in which the host material 31A is dispersed is removed. Alternatively, the solvent 40 may be removed by further heating the substrate 10 or heating the atmosphere. Here, the heating is performed in a temperature range below the boiling point of the solvent 40 of the material liquid 32. At this time, the solvent 40 of the material liquid 32 in which the host material 31A is dispersed is removed, and at the same time, the host material 31A and the guest material are uniformly mixed.

  Next, as shown in FIG. 5B, by completely removing the solvent 40 of the material liquid 32 in which the host material 31A is dispersed, the light emitting layer 33 in which the host material 31A and the guest material are uniformly mixed is formed. It is formed.

  Next, a hole blocking layer and an electron injecting and transporting layer (not shown) are formed on the light emitting layer 33 by a wet film forming method such as an ink jet method or a spin coat method.

  Next, as shown in FIG. 5C, the second electrode 12 made of a conductive material such as aluminum is formed on the light-emitting layer 33 (a hole blocking layer or an electron injecting and transporting layer is formed using a known technique). And the entire portion of the partition wall layer 20 exposed on the substrate 10 is formed. Thus, the organic EL device 1 is completed.

  According to the method of manufacturing the organic EL device 1 of the present embodiment, the material liquid 32 in which the guest material that is easily soluble in the solvent 40 is dissolved on the host material 31A that is hardly soluble in the solvent 40 is discharged. Therefore, the problem of segregation can be avoided as compared with the case where the host material 31A and the guest material are dissolved in the same solvent and applied onto the substrate. Therefore, a uniform dispersion state of the host material 31A and the guest material can be realized, and the light emitting layer 33 in which the host material 31A and the guest material are uniformly mixed can be obtained.

  In general, when a material is modified with an alkyl chain or the like in order to improve the solubility and applied to a wet process, the thermal stability of the material and the charge transporting property are often reduced, but the host material 31A With respect to, since it is not necessary to modify an alkyl group or the like in order to impart solubility to the material, it is possible to avoid a decrease in light emission characteristics. In addition, since the guest material is discharged using a droplet discharge method, the amount of use of a material containing rare and expensive platinum, iridium, etc. can be suppressed as compared with vapor deposition and mask coating, so there is an effect of cost merit. is there. As a result, it is possible to manufacture the organic EL device 1 having a longer lifetime as a product and improving the light emission characteristics at a low cost.

  Further, according to this manufacturing method, the step of dispersing the host material 31 </ b> A in the material liquid 32 is performed by heating in a temperature range equal to or lower than the boiling point of the solvent 40, so the material liquid 32 that has penetrated into the material film 31. It is possible to cause convection in the substrate and further promote the dispersion of the host material 31A into the material liquid 32. As a result, the light emitting layer 33 in which the host material 31A and the guest material are more uniformly mixed can be obtained.

  Further, according to this manufacturing method, since the step of removing the solvent 40 in the material liquid 32 in which the host material 31A is dispersed is performed in a vacuum, the solvent in the material liquid 32 in which the host material 31A is dispersed. The removal of 40 can be further promoted, and the convection is generated in the material liquid as the solvent 40 stops. As a result, the light emitting layer 33 in which the host material 31A and the guest material are uniformly mixed can be obtained more efficiently.

  Further, according to this manufacturing method, the step of removing the solvent 40 in the material liquid 32 in which the host material 31A is dispersed is performed by heating in the temperature range below the boiling point of the solvent 40. It is possible to further promote the removal of the solvent 40 in the material liquid 32 in which the host material 31A is dispersed while causing convection in the permeated material liquid 32 and further promoting the dispersion of the host material 31A into the material liquid 32. As a result, the light emitting layer 33 in which the host material 31A and the guest material are more uniformly mixed can be obtained more efficiently.

  In the present embodiment, a bottom emission method in which light generated by the organic EL element is emitted to the substrate 10 side is adopted. However, the present invention is not limited to this, and the light is emitted to the second electrode 12A side. A top emission method may be adopted.

(Electronics)
Next, an electronic apparatus according to the present invention will be described using a mobile phone as an example. FIG. 6 is a perspective view showing the overall configuration of the mobile phone 600. The mobile phone 600 includes a housing 601, an operation unit 602 provided with a plurality of operation buttons, and a display unit 603 that displays images, moving images, characters, and the like. The display unit 603 is equipped with the organic EL device 1 according to the present invention.
Since the mobile phone 600 includes the organic EL device 1 having a longer life and improved light emission characteristics as a product, the mobile phone 600 becomes a highly reliable and high-performance electronic device.

  In addition to the mobile phone 600, the electronic device includes a multimedia-compatible personal computer (PC), an engineering workstation (EWS), a pager, a projection type liquid crystal display device, a word processor, a television, and a viewfinder type. Or a monitor direct-view type video tape recorder, an electronic notebook, an electronic desk calculator, a car navigation device, a POS terminal, a touch panel, and the like.

FIG. 3 is an enlarged plan view around a sub pixel of the organic EL device according to the first embodiment. It is a fragmentary sectional view of the organic EL device concerning a 1st embodiment. It is a figure which shows the manufacturing process of the organic electroluminescent apparatus which concerns on 1st Embodiment. FIG. 4 is a diagram illustrating manufacturing steps of the organic EL device following FIG. 3. It is a figure which shows the manufacturing process of an organic electroluminescent apparatus following FIG. It is a schematic block diagram of the mobile telephone which is an example of an electronic device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 ... Organic EL apparatus 5,5A ... Organic EL element (light emitting element) 10 ... Substrate 11 ... 1st electrode 12 ... 2nd electrode 20 ... Partition wall layer 21 ... 1st partition layer 22 ... 2nd partition layer, 31 ... material film, 31A ... host material, 32 ... material liquid, 33 ... light emitting layer, 40 ... solvent, 600 ... mobile phone (electronic device)

Claims (5)

A method of manufacturing an organic EL device in which a light emitting layer is sandwiched between a first electrode and a second electrode,
Forming a partition layer standing on the substrate along the peripheral edge of the first electrode;
Depositing a host material that is sparingly soluble in a solvent in a region surrounded by the partition layer;
Arranging a material solution in which a guest material that is easily soluble in the solvent is dissolved in the solvent in a region surrounded by the partition layer;
The host material and the guest material are mixed by allowing the material liquid to permeate the material film of the host material and removing the solvent in the material liquid while dispersing the host material in the material liquid. Forming a light emitting layer in a region surrounded by the partition layer, and a method for manufacturing an organic EL device.   The method of manufacturing an organic EL device according to claim 1, wherein the material liquid is selectively discharged to a region surrounded by the partition wall by an inkjet method.   3. The step of depositing the host material comprises depositing a guest material different from the guest material and hardly soluble in the solvent together with the host material. Manufacturing method of the organic EL device.   In the step of forming the light emitting layer, the host material is dispersed in the material liquid by heating the material liquid in a temperature range below the boiling point of the solvent and generating convection in the material liquid. The method for manufacturing an organic EL device according to claim 1, wherein the method is characterized in that:   In the step of forming the light emitting layer, the host material is dispersed in the material liquid by evaporating the solvent in the material liquid in a vacuum atmosphere and generating convection in the material liquid. The manufacturing method of the organic electroluminescent apparatus of any one of Claims 1-3 to do.

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