JP5151201B2 - Method for manufacturing organic electroluminescence element - Google Patents

Description

The present invention relates to the production how the organic electroluminescent device.

The organic electroluminescence element has a structure in which at least one organic thin film including a light emitting layer is sandwiched between a pair of upper and lower electrodes. The organic molecules forming the organic thin film are roughly classified into low molecular weight systems and high molecular weight systems. When organic molecules are low molecular weight, organic thin films are formed mainly by vacuum deposition. When high molecular weight, organic films are mainly dissolved or dispersed in a solvent and then wet coating methods such as spin coating and ink jet methods. It is common to form an organic thin film. In particular, the ink jet method is very effective as a means capable of easily and finely patterning an organic electroluminescence material without wasting it (for example, see Patent Documents 1 and 2).
JP 2002-231447 A Japanese Patent Laid-Open No. 2005-100954

  In the ink jet method, there is an optimum range for the viscosity of the solution to be ejected, and ejection within this range is important for stable and uniform film formation. For example, Patent Document 1 describes that the solution viscosity that can be stably discharged without causing clogging of the discharge nozzle of the inkjet head is preferably about 2 to 20 cps, and particularly preferably about 7 to 10 cps. However, when the solute is a polymer, the viscosity is often greater than 20 cps, making it difficult to select a polymer and a solvent. Although a method of decreasing the viscosity by reducing the concentration of the solute is conceivable, in that case, it is necessary to apply several times and the process becomes complicated.

  Patent Document 2 discloses a method in which EDOT, which is a monomer of PEDOT (a material for forming a hole injection layer), and a polymerization catalyst such as iron chloride III are discharged by a droplet discharge method and polymerized on a substrate. In this case, since the monomer and the polymerization catalyst are low molecules, the viscosity in the solution state is also low, and the above problem can be solved. However, in the organic electroluminescence device, the remaining polymerization catalyst deteriorates performance, which is not preferable. Further, the above method is specialized for the material for forming the hole injection layer, and the material for forming the electron injection / transport layer has not yet been clarified.

  Note that Patent Document 2 describes an ink jet method using a piezo method, but the above-described problems are ink jet methods other than the piezo method, and droplets other than the ink jet method in which a film is formed by discharging a droplet. This is a common problem in the discharge method.

  The present invention has been made in view of such circumstances, and in the case of forming an electron injecting and transporting layer by a wet film forming method, the viscosity of the solution can be lowered to ensure stable ejection performance, and the light emitting characteristics are deteriorated. Another object of the present invention is to provide a method for producing an organic electroluminescence element capable of preventing the life from being lowered. It is another object of the present invention to provide an organic electroluminescence device and an electronic device that are highly reliable and have excellent light emission characteristics by including such an organic electroluminescence element.

In order to solve the above problems, a method for producing an organic electroluminescence device of the present invention includes a functional layer composed of two or more layers including an electron injecting and transporting layer and a light emitting layer, and a pair of electrodes sandwiching the functional layer. The step of forming the electron injecting and transporting layer comprises a monomer or an oligomer having a vinyl group and a functional group having an electron injecting and transporting function on the light emitting layer. The method includes arranging a precursor by a wet film forming method and polymerizing the precursor by heat treatment or ultraviolet irradiation treatment. As the precursor, for example, a precursor of an example described later is used. According to this method, since the electron injecting and transporting layer is formed by a polymerization reaction of a monomer or oligomer having a low viscosity, even when a precursor containing each monomer or oligomer is discharged by a droplet discharging method, stable discharging performance is achieved. Can be secured. In addition, since the electron injecting and transporting layer is crosslinked without a polymerization catalyst by a vinyl group radical reaction, neither light emission characteristics are deteriorated due to catalyst impurities nor the lifetime of the organic electroluminescence element is reduced. As a wet film formation method, a known method typified by a spin coating method, a droplet discharge method, or the like can be used.

  In the present invention, the precursor preferably includes one or more monomers or oligomers represented by the following formulas (1) to (3) (in addition, A is represented by the following formulas (4) to ( 8) or a molecular skeleton of a derivative containing one or more aromatic rings represented by the following formula (9), wherein the vinyl group is a hydrogen group in the molecular skeleton or Introduced by substituting the butyl group (t-Bu)). According to this method, an electron injecting and transporting layer having high electron injecting and transporting efficiency can be formed. Formula (1) is a monofunctional monomer or oligomer containing one vinyl group, Formula (2) is a bifunctional monomer or oligomer containing two vinyl groups, and Formula (3) Is a trifunctional monomer or oligomer containing three vinyl groups.

  The organic electroluminescent device of the present invention includes an organic electroluminescent element manufactured by the above-described method for manufacturing an organic electroluminescent element of the present invention. According to this configuration, it is possible to provide an organic electroluminescence device having high reliability and excellent light emission characteristics.

  Embodiments of the present invention will be described below with reference to the drawings. Such an embodiment shows one aspect of the present invention and does not limit the present invention. In the following embodiments, various shapes, combinations, and the like of the constituent members are examples, and various modifications can be made based on design requirements and the like without departing from the gist 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 a schematic configuration diagram of an organic EL device provided with the organic electroluminescence element of the present invention (organic EL element; hereinafter, “electroluminescence” is abbreviated as “EL”). The organic EL device 1 includes a first electrode 3, a functional layer 7, and a second electrode 8 on a substrate 2. The functional layer 7 includes two or more layers including the light emitting layer 5 and the electron injecting and transporting layer 6, and the organic E element 9 as a light emitting element is formed by the first electrode 3, the functional layer 7, and the second electrode 8. It is configured. In the present embodiment, the first electrode 3 is an anode and the second electrode 8 is a cathode, but the first electrode 3 may be a cathode and the second electrode 8 may be an anode. In addition, ITO (indium tin oxide) is used as the first electrode 3, and an Al film is deposited on the co-deposited film of LiF (lithium fluoride) and Mag, Ca, or Ba as the second electrode 8. However, the material of the electrode is not limited to this.

  The light emitting layer 5 includes a known light emitting material capable of emitting fluorescence or phosphorescence. Specifically, (poly) fluorene derivative (PF), (poly) paraphenylene vinylene derivative (PPV), polyphenylene derivative (PP), polyparaphenylene derivative (PPP), polyvinylcarbazole (PVK), polythiophene derivative, polymethyl Polysilanes such as phenylsilane (PMPS) are preferably used. In addition, these polymer materials include polymer materials such as perylene dyes, coumarin dyes, rhodamine dyes, rubrene, perylene, 9,10-diphenylanthracene, tetraphenylbutadiene, Nile red, coumarin 6, and quinacridone. It can also be used by doping a low molecular weight material such as. Alternatively, a low molecular material such as carbazole (CBP) can be doped with these low molecular dyes to form a light emitting layer. Tris-8-quinolinolato aluminum complex (Alq3) can also be added as an electron transporting layer as part of the light emitting layer.

  The electron injecting and transporting layer 6 has a precursor made of a monomer or an oligomer having a vinyl group and a functional group having an electron injecting and transporting function in the molecular skeleton on the substrate 2 (more specifically, on the light emitting layer 5), It is formed by polymerizing the precursor by a vinyl group radical reaction. As the precursor, one containing any one or two or more monomers or oligomers of the following formulas (1) to (3) is used.

  As said A, what has the molecular skeleton of following formula (4)-(8) which is an electron injection transport layer forming material of a low molecular weight organic EL element is desirable. In this case, the vinyl group is introduced by substituting a hydrogen group or a butyl group (t-Bu) in the molecular skeleton. In addition, a derivative containing one or more of the compounds (aromatic rings) in FIG. 3 may be used as A.

  Next, a method for manufacturing the organic EL device 1 will be described with reference to FIG. First, as shown in FIG. 2A, the light emitting layer 5 is formed on the substrate 2 on which the first electrode 3 is formed. A hole injection / transport layer or the like may be formed between the first electrode 3 and the light emitting layer 5 as necessary. As a method for forming the light emitting layer 5, a known wet film formation method represented by a spin coating method and a droplet discharge method can be used. Specifically, the polymer light-emitting material is dissolved or dispersed in an organic solvent, and placed on the substrate 2 (more specifically, on the first electrode 3) by spin coating or droplet discharge, and this is dried. Can be formed.

  Next, as shown in FIG. 2 (b), a liquid material 6a containing a precursor of an electron injecting and transporting material is disposed on the light emitting layer 5, and the precursor is polymerized on the substrate 2, whereby FIG. The electron injecting and transporting layer 6 shown in (c) is formed. The liquid material 6a is disposed on the light emitting layer 5 by an ink jet method which is a kind of droplet discharge method. Examples of the ink jet method include a piezo method, a charge control method, a pressure vibration method, an electrothermal conversion method, and an electrostatic suction method, but are not particularly limited. In the case of disposing the liquid material 6a, the droplet discharge head of the droplet discharge apparatus is filled with the liquid material 6a, the nozzle of the droplet discharge head is opposed to the substrate 2, and the droplet discharge head and the substrate 2 are relatively positioned. While being moved, the liquid material 6a whose liquid amount per droplet is controlled is discharged onto the light emitting layer 5 from the droplet discharge head. Here, since the precursor of the electron injecting and transporting material is a monomer or oligomer having a low molecular weight, the liquid material 6a in which the precursor is dissolved or dispersed is a liquid material having a low viscosity. Therefore, when discharging onto the substrate 2 by the droplet discharge head, the liquid material has good discharge performance.

  Solvents for electron injecting and transporting materials include isopropyl alcohol (IPA), normal butanol, γ-butyrolactone, N-methylpyrrolidone (NMP), dimethylformamide (DMF), hexamethylphossolamide (HMPA), dimethyl sulfoxide (DMSO) 1, 3-dimethyl-2-imidazolidinone (DMI) and derivatives thereof, and glycol ethers such as carbitol acetate and butyl carbitol acetate.

  The polymerization reaction is caused by a radical reaction of a vinyl group contained in the precursor. In the case of performing polymerization, the liquid material 6a is subjected to heat treatment or ultraviolet irradiation treatment as necessary. Thereby, the radical reaction (polymerization reaction) of a vinyl group is promoted. As a process for causing polymerization, an electron beam irradiation process or the like can be used in addition to the heat treatment and the ultraviolet irradiation process. However, heat treatment is preferable in view of the fact that the processing apparatus can be downsized and damage to the organic film is small. The heat treatment is desirably performed in an inert gas atmosphere. For example, the polymerization reaction can be promoted by performing a heat treatment at 200 ° C. for about 10 to 60 minutes in a nitrogen atmosphere.

  When the light emitting layer 5 and the electron injecting and transporting layer 6 are formed by the above-described steps, the second electrode 8 is formed on the electron injecting and transporting layer 6 as shown in FIG. Thus, the organic EL element 9 is completed.

  As described above, in the present embodiment, the electron injecting and transporting layer 6 is formed by a polymerization reaction of a monomer or oligomer having a low viscosity. Therefore, even when the precursor containing the monomer or oligomer is discharged by the droplet discharge method, stable discharge performance can be ensured. For example, in the case of this embodiment, it is easy to suppress the viscosity of the liquid material 6a within the range of 2 to 20 Ps, and stable ejection from the droplet ejection head is possible. Further, since the electron injecting and transporting layer 6 is crosslinked without a polymerization catalyst by a radical reaction of a vinyl group, the light emission characteristics are not deteriorated by the catalyst impurities, and the lifetime of the organic EL element 9 is not reduced. Thereby, an organic EL device having excellent reliability can be provided.

[Example]
Next, examples of the present embodiment will be described. First, as a first example, a hole injecting and transporting layer having a layer thickness of 50 nm to 60 nm is formed by spin coating on a substrate on which a first electrode (anode) is formed, and is heated at 150 ° C. to perform a baking treatment. It was. Here, 3,4-polyethylenedioxythiophene / polystyrenesulfone sun (PEDOT / PSS), which is a polyolefin derivative, was used as a material for forming the hole injecting and transporting layer.

  Then, a 1.8 wt% xylene solution of poly (9,9-dioctylfluorene-2,7-diyl) was applied to a thickness of 60 nm to 80 nm by spin coating, and baked at 130 ° C. for 30 minutes in a nitrogen atmosphere. Processing was performed to form a light emitting layer.

Next, a precursor of the following formula ( 10 ) was dissolved in DMF, and a film was formed on the substrate (light emitting layer) by a droplet discharge method. And the electron injection transport layer of the polymer film was formed by heat-processing a base | substrate in 200 degreeC and about 10 minutes-60 minutes in nitrogen atmosphere. The method for synthesizing the precursor of formula ( 10 ) is as shown in FIG. 4 (reference: Macromolecules 2002, 35, 2529). In FIG. 4, the identification of the compounds A, B, C and the final product compound (having the structure of the formula ( 10 )) was performed by mass spectrometry.

Then, in a vacuum atmosphere with a degree of vacuum of 10 ⁻⁶ Torr (1.33 × 10 ⁻⁴ Pa), a 4 nm thick LiF layer, a 10 nm thick Ca layer, and a 200 nm thick Al layer are stacked by vacuum deposition. Then, the second electrode (cathode) was formed to complete the organic EL element.

  Next, as a second embodiment, a hole injecting and transporting layer having a layer thickness of 50 nm to 60 nm is formed on a substrate on which a first electrode (anode) is formed by spin coating, and heated at 150 ° C. to perform a baking treatment. went. Here, 3,4-polyethylenedioxythiophene / polystyrenesulfone sun (PEDOT / PSS), which is a polyolefin derivative, was used as a material for forming the hole injecting and transporting layer.

  Then, a 1.8 wt% xylene solution of poly (9,9-dioctylfluorene-2,7-diyl) was applied to a thickness of 60 nm to 80 nm by spin coating, and baked at 130 ° C. for 30 minutes in a nitrogen atmosphere. Processing was performed to form a light emitting layer.

Next, a precursor of the following formula ( 11 ) was dissolved in DMF and formed on the substrate (light emitting layer) by a droplet discharge method. And the electron injection transport layer of the polymer film was formed by heat-processing a base | substrate in 200 degreeC and about 10 minutes-60 minutes in nitrogen atmosphere. The method for synthesizing the precursor of the formula ( 11 ) is as shown in FIG. 5 (reference document: Macromolecules 1993, 26, 2209). In FIG. 5, the final product compound (having the structure of formula ( 11 )) was identified by mass spectrometry.

Then, in a vacuum atmosphere with a degree of vacuum of 10 ⁻⁶ Torr (1.33 × 10 ⁻⁴ Pa), a 4 nm thick LiF layer, a 10 nm thick Ca layer, and a 200 nm thick Al layer are stacked by vacuum deposition. Then, the second electrode (cathode) was formed to complete the organic EL element.

  Next, as a third embodiment, a hole injecting and transporting layer having a thickness of 50 nm to 60 nm is formed on the substrate on which the first electrode (anode) is formed by spin coating, and heated at 150 ° C. to perform a baking treatment. went. Here, 3,4-polyethylenedioxythiophene / polystyrenesulfone sun (PEDOT / PSS), which is a polyolefin derivative, was used as a material for forming the hole injecting and transporting layer.

  Then, a 1.8 wt% xylene solution of poly (9,9-dioctylfluorene-2,7-diyl) was applied to a thickness of 60 nm to 80 nm by a spin coating method, and in a nitrogen atmosphere, 130 ° C., 30 minutes. A light emitting layer was formed by baking treatment.

Next, the first precursor and the formula of the following formula (10) a second precursor (11) was dissolved in DMF, by a droplet discharge method, a film was formed on a substrate (light emitting layer). And the electron injection transport layer of the polymer film was formed by heat-processing a base | substrate in 200 degreeC and about 10 minutes-60 minutes in nitrogen atmosphere.

Then, in a vacuum atmosphere with a degree of vacuum of 10 ⁻⁶ Torr (1.33 × 10 ⁻⁴ Pa), a 4 nm thick LiF layer, a 10 nm thick Ca layer, and a 200 nm thick Al layer are stacked by vacuum deposition. Then, the second electrode (cathode) was formed to complete the organic EL element.

  Next, as a comparative example, a hole injecting and transporting layer having a layer thickness of 50 nm to 60 nm was formed by spin coating on a substrate on which the first electrode (anode) was formed, and was heated at 150 ° C. to be fired. . Here, 3,4-polyethylenedioxythiophene / polystyrenesulfone sun (PEDOT / PSS), which is a polyolefin derivative, was used as a material for forming the hole injecting and transporting layer.

  Then, a 1.8 wt% xylene solution of poly (9,9-dioctylfluorene-2,7-diyl) was applied to a thickness of 60 nm to 80 nm by spin coating, and baked at 130 ° C. for 30 minutes in a nitrogen atmosphere. Processing was performed to form a light emitting layer.

Next, a LiF layer having a thickness of 4 nm and a Ca layer having a thickness of 10 nm are formed by vacuum deposition in a vacuum atmosphere having a degree of vacuum of 10 ⁻⁶ Torr (1.33 × 10 ⁻⁴ Pa) without providing an electron injecting and transporting layer. A second electrode (cathode) was formed by laminating a layer and an Al layer having a layer thickness of 200 nm to complete an organic EL device.

  Next, the emission spectrum was measured about the organic EL element of Example 1, Example 2, Example 3, and the comparative example which were manufactured in this way. As a result, in the organic EL elements of Examples 1 to 3, an emission spectrum of about 460 nm was obtained, and in the organic EL element of the comparative example, an emission spectrum of about 440 nm was obtained.

Next, the organic EL elements of Example 1, Example 2, Example 3, and Comparative Example were driven at a constant current with an initial luminance of 800 cd / cm ² , and current efficiency and half-life of luminance were measured. As a result, the results shown in Table 1 were obtained. In Table 1, the comparative example is normalized as 1.

From Table 1, it was found that the results superior to the comparative examples were obtained in Examples 1 to 3. In addition, Example 3 was superior in both current efficiency and life compared to Example 1 and Example 2. This is because the copolymer of the first precursor of the above formula ( 10 ) and the second precursor of the above formula ( 11 ) has the electron transport ability of the oxazole derivative of the first precursor and the triazole of the second precursor. It is inferred that each has a hole blocking ability of a derivative and functions in concert.

[Image forming apparatus]
Next, an image forming apparatus which is a first embodiment of an electronic apparatus including the organic EL element of the present invention will be described. FIG. 6 is a schematic configuration diagram showing an image forming apparatus 100 including the organic EL device of FIG. 1 as a line head.

  The image forming apparatus 100 includes a photosensitive drum 16 as an image carrier in the vicinity of the travel path of the transfer medium 22. Around the photosensitive drum 16, an exposure device 15, a developing device 18, and a transfer roller 21 are sequentially arranged along the rotation direction of the photosensitive drum 16 (indicated by an arrow in the drawing). The photosensitive drum 16 is rotatably provided around the rotation shaft 17, and a photosensitive surface 16 </ b> A is formed on the outer peripheral surface of the photosensitive drum 16 at the central portion in the rotation axis direction. The exposure device 15 and the developing device 18 are arranged in a long axis shape along the rotation shaft 17 of the photosensitive drum 16, and the width in the long axis direction substantially coincides with the width of the photosensitive surface 16A.

  In this image forming apparatus 100, first, in the process of rotating the photosensitive drum 16, the surface of the photosensitive drum 16 (photosensitive surface 16 </ b> A) is positive (for example, positive) by a charging device (not shown) provided on the upstream side of the exposure device 15. Then, the exposure device 15 exposes the surface of the photosensitive drum 16 to form an electrostatic latent image LA on the surface. Further, the toner (developer) 20 is applied to the surface of the photosensitive drum 16 by the developing roller 19 of the developing device 18, and the toner image corresponding to the electrostatic latent image LA is formed by the electric attractive force of the electrostatic latent image LA. It is formed. The toner particles are positively (+) charged.

  After the toner image is formed by the developing device 18, the toner image comes into contact with the transfer medium 22 by further rotation of the photosensitive drum 16, and the transfer roller 21 reverses the polarity of the toner particles from the toner image from the back surface of the transfer medium 22. Charge (here, negative (−) charge) is applied, and accordingly, toner particles forming a toner image are attracted from the surface of the photosensitive drum 16 to the transfer medium 22, and the toner image is transferred to the surface of the transfer medium 22. Is transcribed.

  The exposure apparatus 15 includes a line head 1 having a plurality of organic EL elements 9 and an imaging optical element 12 having a plurality of lens elements 13 for imaging the light L emitted from the line head 1 at an erecting equal magnification. I have. The line head 1 and the imaging optical element 12 are held by a head case (not shown) while being aligned with each other, and are fixed on the photosensitive drum 16.

  The line head 1 includes a light emitting element array 10 in which a plurality of organic EL elements 9 are arranged along the rotation axis 17 of the photosensitive drum 16, and a drive element group including a drive element (not shown) that drives the organic EL elements 9. And a control circuit group 11 for controlling driving of these drive elements (drive element group). The organic EL element 9, the drive element group, and the control circuit group 11 are integrally formed on a long and thin element substrate (base) 2.

  The imaging optical element 12 is arranged (arranged) in a zigzag pattern in which the lens elements 13 having the same configuration as the SELFOC (registered trademark) lens element manufactured by Nippon Sheet Glass Co., Ltd. are arranged along the rotation axis 17 of the photosensitive drum 16. A lens element array 14 is provided.

  In this image forming apparatus 100, the organic EL element 9 formed on the line head 1 has the structure of the light emitting element of the present invention described above. Therefore, the image forming apparatus has high emission luminance and no exposure failure occurs.

[Organic EL display device]
Next, an organic EL display device that is a second embodiment of an electronic apparatus including the organic EL element of the present invention will be described. FIG. 7 is a schematic configuration diagram of an organic EL display device 200 including organic EL elements as pixels in a matrix.

  The organic EL display device 200 includes a circuit element unit 30 including a thin film transistor as a circuit element, a pixel electrode (first electrode) 3 serving as an anode, an organic functional layer 7 including a light emitting layer, and a counter electrode serving as a cathode. (Second electrode) 8, a sealing portion 32, and the like are provided.

  For example, a glass substrate is used as the substrate 2. As a substrate in the present invention, in addition to a glass substrate, various known substrates used for electro-optical devices and circuit substrates such as a silicon substrate, a quartz substrate, a ceramic substrate, a metal substrate, a plastic substrate, and a plastic film substrate are applied. The

  On the base 2, a plurality of pixel areas A as light emitting areas are arranged in a matrix, and when performing color display, for example, corresponding to each color of red (Red), green (Green), and blue (Blue). The pixel area A to be formed is formed in a predetermined arrangement. In each pixel region A, a pixel electrode 3 is arranged, and in the vicinity thereof, a signal line 42, a common power supply line 43, a scanning line 41, a scanning line for other pixel electrodes (not shown), and the like are arranged. As the planar shape of the pixel region A, an arbitrary shape such as a circle or an oval can be applied in addition to the rectangle shown in the figure.

  The sealing portion 32 prevents water and oxygen from entering and prevents the counter electrode 8 or the organic functional layer 7 from being oxidized, and includes a sealing substrate (or sealing can) 34 bonded to the base 2. The sealing substrate 34 is made of glass, metal, or the like, and the base 2 and the sealing substrate 34 are bonded together with a sealing agent. A desiccant is disposed inside the substrate 2, and an inert gas filling layer 33 filled with an inert gas is formed in a space formed between the substrates.

  In the pixel region A, a first thin film transistor 44 for switching in which a scanning signal is supplied to the gate electrode through the scanning line 41 and a holding for holding an image signal supplied from the signal line 42 through the thin film transistor 44. The capacitor cap, the driving second thin film transistor 45 to which the image signal held by the holding capacitor cap is supplied to the gate electrode, and the common supply line when electrically connected to the common power supply line 43 through the thin film transistor 45 A pixel electrode 3 into which a drive current flows from the electric wire 43 and an organic functional layer 7 sandwiched between the pixel electrode 3 and the counter electrode 8 are provided. The organic functional layer 7 includes a light emitting layer, and the organic EL element 9 which is a light emitting element includes the pixel electrode 3, the counter electrode 8, the organic functional layer 7, and the like.

  In the pixel area A, when the scanning line 41 is driven and the first thin film transistor 44 is turned on, the potential of the signal line 42 at that time is held in the holding capacitor cap, and the second capacitance is changed according to the state of the holding capacitor cap. The conductive state of the thin film transistor 45 is determined. In addition, a current flows from the common power supply line 43 to the pixel electrode 3 through the channel of the second thin film transistor 45, and further a current flows to the counter electrode 8 through the organic functional layer 7. And according to the electric current amount at this time, the organic functional layer 7 light-emits.

  In the organic EL display device 200, light emitted from the organic functional layer 7 to the base 2 side is transmitted through the circuit element unit 30 and the base 2 and emitted to the lower side (observer side) of the base 2. Light emitted from the functional layer 7 to the opposite side of the substrate 2 is reflected by the counter electrode 8, and the light passes through the circuit element unit 30 and the substrate 2 and is emitted to the lower side (observer side) of the substrate 2. (Bottom emission type). Note that light emitted from the counter electrode can be emitted by using a transparent material as the counter electrode 8 (top emission type). In this case, ITO, Pt, Ir, Ni, or Pd can be used as the transparent material for the counter electrode.

  In this organic EL display device 200, the organic EL element 9 formed in the pixel region A has the structure of the light emitting element of the present invention described above. Therefore, an organic EL display device with high emission luminance and capable of bright display is obtained.

It is a schematic block diagram which shows one Embodiment of an organic EL element. It is explanatory drawing of the manufacturing method of the same organic EL element. It is an example of the molecular skeleton of an electron injection transport material. It is explanatory drawing of the synthesis | combining method of the precursor of an electron injection transport material. It is explanatory drawing of the synthesis | combining method of the precursor of an electron injection transport material. 1 is a schematic configuration diagram of an image forming apparatus that is a first embodiment of an electronic apparatus. It is a schematic block diagram of the organic electroluminescence display which is 2nd Embodiment of an electronic device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Organic EL apparatus, 2 ... Base | substrate, 3 ... 1st electrode, 5 ... Light emitting layer, 6 ... Electron injection transport layer, 6a ... Liquid material, 7 ... Functional layer, 8 ... 2nd electrode, 9 ... Organic EL element, DESCRIPTION OF SYMBOLS 100 ... Image forming apparatus (electronic device), 200 ... Organic EL display device (electronic device)

Claims (1)

A method for producing an organic electroluminescence device comprising a functional layer composed of two or more layers including an electron injecting and transporting layer and a light emitting layer, and a pair of electrodes sandwiching the functional layer,
In the step of forming the electron injection / transport layer, a precursor made of a monomer or oligomer having a vinyl group and a functional group having an electron injection / transport function is disposed on the light emitting layer by a wet film formation method, look including the step of heat treatment or ultraviolet irradiation treatment to polymerize,
A method for producing an organic electroluminescence element, wherein a mixture of two precursors of the following formulas is used as the precursor .

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