WO2004021746A1 - 有機el素子 - Google Patents
有機el素子 Download PDFInfo
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- WO2004021746A1 WO2004021746A1 PCT/JP2003/010299 JP0310299W WO2004021746A1 WO 2004021746 A1 WO2004021746 A1 WO 2004021746A1 JP 0310299 W JP0310299 W JP 0310299W WO 2004021746 A1 WO2004021746 A1 WO 2004021746A1
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- Prior art keywords
- organic
- leak prevention
- prevention layer
- layer
- resistance
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- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
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- TVIVIEFSHFOWTE-UHFFFAOYSA-K tri(quinolin-8-yloxy)alumane Chemical compound [Al+3].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 TVIVIEFSHFOWTE-UHFFFAOYSA-K 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/18—Carrier blocking layers
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/22—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/87—Arrangements for heating or cooling
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/861—Repairing
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/10—Organic polymers or oligomers
- H10K85/111—Organic polymers or oligomers comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
Definitions
- the present invention relates to an organic electroluminescent device.
- an organic EL (Electroluminecsence) element having a structure in which an organic functional layer is sandwiched between an anode and a cathode is known! /
- FIG. 1 is a cross-sectional view showing an example of a conventional organic EL device 100.
- the organic EL element 1Q0 was formed on a substrate 110, an anode 120 formed on the substrate 110, an organic functional layer 140 composed of a plurality of layers laminated on the anode 120, and an organic functional layer 140.
- a cathode 130 is provided.
- the organic functional layer 140 is an organic layer having at least a light emitting layer.
- the organic functional layer 140 has a hole injection layer 141, a hole transport layer 142, a light emitting layer 143, and an electron injection layer 144, and each layer is sequentially stacked on the anode 120. Let's do it.
- the light-emitting layer 143 holes and electrons recombine to form excitons.
- excitons fall to the lower energy order, and some emit the difference energy between the lower energy order and the excited state as light.
- the light emitted in the light emitting layer 143 is directed to the substrate 110 side or the cathode 130 side. Out to the side.
- the organic EL element 100 functions as a light emitting element.
- the resistance of the defect becomes lower than that of other parts, and the current flows to the defect. (Electrons or holes) are concentrated.
- the increase in Joule heat and the increase in electric field strength due to the concentration of the current may cause a dielectric breakdown at a defective portion and eventually cause a short circuit between the anode and the cathode.
- the organic EL element 200 is formed by forming an anode 220 on a substrate 210, forming an organic functional layer 230 and an organic functional layer 240, and then forming a cathode 250.
- a pinhole 245 which is a defect is formed in the organic functional layer 240 during the film formation process, and the inside of the pinhole 245 is filled with the cathode 250.
- the above-mentioned defects are likely to occur particularly when the organic functional layer is formed by a vapor deposition method.
- the vapor deposition method has poor step coverage (coatability of a step), and thus a film defect is easily caused by a scratch on a substrate or a foreign matter on the substrate.
- the problem to be solved by the present invention is that the anode and the cathode are damaged by insulation blasting.
- One example is the problem that the poles are short-circuited.
- An organic EL device includes an anode, a cathode, and an organic EL layer that is sandwiched between the anode and the cathode and emits light. It is an organic EL element having at least.
- FIG. 1 is a diagram illustrating an example of an organic EL device.
- 2A and 2B are diagrams showing problems of the organic EL device.
- FIG. 3 is a diagram showing an embodiment of the organic EL device according to the present invention.
- 4A and 4B are schematic diagrams for explaining the function of the leak prevention layer.
- FIGS. 5A and 5B are diagrams showing the temperature change of the resistance value of the leak prevention layer.
- 6A and 6B are views showing a post-treatment for improving the step coverage of the leak prevention layer formed by the vapor deposition method.
- FIG. 7 is a view showing a modification of the embodiment of the organic EL device according to the present invention.
- FIG. 8 is a view showing another modification of the embodiment of the organic EL device according to the present invention.
- FIG. 9 is a graph showing the relationship between the heating temperature and the specific resistance of the poly-phosphorus film.
- FIG. 10 is a diagram showing a reverse voltage characteristic of the organic EL element.
- the organic EL device includes an organic EL layer that emits light and is sandwiched between an anode and a cathode.
- This organic EL layer has at least a leak prevention layer whose resistance increases with increasing temperature.
- FIG. 3 is a cross-sectional view showing an organic EL device 10 as an example of the present invention.
- the organic EL element 10 is formed on a substrate 11, an anode 12 formed on the substrate 11, an organic functional layer 14 composed of a plurality of layers laminated on the anode 12, and an organic functional layer 14. And a cathode 13.
- the organic functional layer 14 has a hole injection layer 15, a hole transport layer 16, a light emitting layer 17, and an electron injection layer 18, which are sequentially stacked from the anode 13 side.
- the hole injection layer 15 injects holes into the light emitting layer 17 through the hole transport layer 16 by applying a voltage.
- the electron injection layer 18 injects electrons into the light emitting layer 17 by applying a voltage.
- holes and electrons recombine to form excitons. In a very short time, excitons fall to the lower energy order, and some emit light as the energy difference between the lower energy order and the excited state.
- the light emitted in the light emitting layer 17 is emitted from the substrate 11 side or the cathode 13 side. Thereby, the organic EL element 10 functions as a light emitting element.
- the hole injection layer 15 functions as a hole injection layer that injects holes into the light emitting layer 17 via the hole transport layer 16 in a normal use temperature range.
- the hole injection layer 15 functions as a leak prevention layer for suppressing house current in a temperature range higher than the normal use temperature.
- the hole transport layer 15 has a material strength that increases in specific resistance at least in a high temperature region exceeding the maximum use temperature (maximum operating temperature or maximum storage temperature) of the product and causes high resistance. Therefore, the hole injection layer 15 has high resistance due to generation of Joule heat due to current concentration caused by defects. This suppresses the current and prevents damage to the device such as dielectric breakdown.
- FIGS. 4A and 4B are schematic diagrams for explaining the function of the leak prevention layer.
- the organic functional layer consists of only two layers, a leak prevention layer and other layers. It will be described as having been performed.
- the organic EL element 20 is formed by forming an anode 22 on a substrate 21, forming a leak prevention layer 23 and an organic functional layer 24, and then forming a cathode 25.
- the leak prevention layer 23 is made of a material whose specific resistance increases and increases its resistance at least in a high temperature region exceeding the maximum use temperature (maximum operating temperature or maximum storage temperature) of the product.
- there is a pinhole 24a which is a defect formed in the organic functional layer 24 during the film formation process, and the pinhole 24a is filled with the cathode 25. .
- the hole injection layer 15 is configured as a leak prevention layer, but the leak prevention layer can be provided at any position of the organic functional layer.
- the leak prevention layer functions as a part of the organic EL element such as injection and transport of carriers (electrons or holes) during normal operation that does not only prevent current concentration. Therefore, in order to increase the device efficiency of the entire organic EL device, it is necessary that the ionization potential, the carrier mobility, and the like be appropriately set according to the location where the device is arranged.
- the leak prevention layer provided on the side closer to the cathode than the light emitting layer needs to have high electron transportability, and is provided on the side closer to the cathode than the light emitting layer. It is necessary that the leak preventing layer has a high hole transporting property.
- the layers other than the anti-work layer are made of a low molecular material, and the anti-leak layer is made by a wet film forming method such as a spin coating method or a printing method, or a film forming method that causes a large damage to a substrate such as a sputtering method.
- a wet film forming method such as a spin coating method or a printing method
- a film forming method that causes a large damage to a substrate such as a sputtering method.
- low molecular organic materials have low solvent resistance or heat resistance. Therefore, if an organic functional layer other than the leak prevention layer composed of a low molecular weight organic material is formed, and then the leak prevention layer is formed by the above method or the like, the organic functional layer other than the leak layer is damaged. May be given.
- an organic EL device in which an anode is arranged on a substrate, it is preferable to form a hole transporting leak prevention layer directly above the anode. Further, in the case of an organic EL device having a cathode disposed on a substrate, it is preferable to form an electron-transporting leakage prevention layer directly above the cathode.
- the resistance of the leak prevention layer is preferably increased at a temperature of 120 ° C. or higher.
- the operating temperature range of organic EL is up to about 100 ° C. Therefore, by increasing the resistance at a higher temperature, it is possible to suppress damage to the element due to current concentration.
- the resistance of the leak prevention layer is more preferably increased at a temperature of 200 ° C. or higher. Even when the operating temperature range of the organic EL element is about S100 ° C, the organic EL element in use is generated by the Joule heat generated by the current flowing through the organic EL element and the heat generated by the drive circuit and other parts other than the organic EL element. The temperature of the EL element is 120 to 200 ° C. Therefore, in order not to hinder the driving of the organic EL element during normal operation, it is better not to increase the resistance below 200 ° C.
- the resistance of the leak prevention layer is preferably increased at a temperature of 400 ° C. or lower, and more preferably at a temperature of 300 ° C. or lower.
- Anode-cathode between conventional organic EL devices When the short-circuited part was observed, it was observed that the Al used for the cathode was dissolved, so the temperature of the defective part was locally and temporarily increased to the melting point of A1 (about 660 ° C) or higher. It seems to be something. In general, in a high temperature range exceeding 500 ° C, the leak prevention layer itself is consumed and the weight is drastically reduced, so that the ability to prevent a short circuit is lost. Therefore, it is not preferable that the resistance increase of the leak prevention layer occurs at a high temperature at which the short prevention is not useful. Generally, it is effective to generate the temperature in the temperature range of about 300 to 400 ° C.
- the resistance of the leak prevention layer is increased at a temperature of 120 to 400 ° C., and it is more preferable that the resistance is increased at a temperature of 200 to 300 ° C.
- FIG. 5A and 5B are diagrams showing a change in resistance value of the leak prevention layer with temperature.
- the rate of change of the resistance value of the leak prevention layer is steep near the resistance increasing temperature. If the change near the high resistance temperature (high resistance region) is gentle as shown in Fig. 5A, the relaxation of the current in the defective part progresses slowly, and the influence of Joule heat spreads widely around the defective part. Get out.
- the leak prevention layer acts like a fuse at the defect, and when the resistance of the leak prevention layer is increased, the resistance value changes sharply near the high resistance temperature, as shown in Figure 5B. I hope that.
- increasing the resistance of the leak prevention layer means that the resistance value of the leak prevention layer is significantly increased to a level that does not cause a short circuit between the electrodes due to Joule heat due to current concentration. If the defect becomes hot due to current concentration, the resistance of the leak prevention layer must be at least equal to the resistance of the organic function of the normal part to reduce the current concentration . That is, the resistance between the anode and the cathode under normal conditions must be equal to or higher than that. That is, (Resistance value of leak prevention layer at high resistance) ⁇ (Resistance value of organic functional layer at normal temperature).
- the extent to which the resistance value of the leak prevention layer should change in the process from normal temperature to high resistance depends on the element structure, and cannot be determined unconditionally. It is preferable that the temperature rises or becomes an insulator when the resistance is increased (specific resistance becomes 10 U Q'cm or more).
- the leak prevention layer prevents the organic EL element from being destroyed due to a defect formed unintentionally in a layer constituting another organic functional layer. Therefore, it is preferable that the leak prevention layer has no defect in the leak prevention layer itself. However, if there is a concavo-convex portion due to a scratch or a foreign substance on the substrate, a common defect is likely to occur in each of the layers constituting the organic functional layer, so that a defect may also occur in the leak prevention layer itself. If the leak prevention layer itself has many defects, short circuit cannot be prevented even if the resistance is increased by Joule heat.
- the leak prevention layer has a good step force variation and a small number of pinholes as compared with other organic functional layers.
- the leak prevention layer is formed by a wet film forming method such as a spin coating method or a printing method, or by a gas phase film forming method such as a CVD method. It is preferable to do so.
- the film is formed by a film formation method having a strong directionality and a poor step coverage, such as a vapor deposition method, it is preferable to form a film having a good step coverage by post-processing.
- the spin coating method refers to a method in which a fluid material is dropped on a rotated lamination surface and is uniformly applied to the lamination surface by centrifugal force.
- the printing method refers to a method such as flexographic printing.
- CVD chemical vapor deposition
- a gas of a reactive molecule or a mixed gas of the reactive molecule and an inert carrier is allowed to flow on a heated substrate to perform hydrolysis, self-decomposition, photolysis, oxidation-reduction, substitution, etc.
- This refers to a method of depositing a reaction product on a substrate.
- the vapor deposition method is a method in which a small piece of metal or nonmetal is heated and evaporated in a high vacuum and pseudo-deposited as a thin film on a base surface of glass, a crystal plate, cleaved crystal, or the like.
- FIG. 6A and 6B are views showing an example of a post-processing method for improving the step coverage of a leak prevention layer formed by an evaporation method or the like.
- a film formation method with poor step coverage such as a vapor deposition method
- a leak prevention layer is formed on the upper surface of the protrusion and the bottom surface of the dent, but on the side surface of the protrusion and the dent. It is difficult to form a leak prevention layer. Therefore, the layer on the lower surface of the leak prevention layer is exposed, and the lower surface is difficult to be completely covered with the leak prevention layer.
- the leak prevention layer melts and moves to cover the exposed lower layer.
- the surface of the leak prevention layer can be smoothed, pinholes and the like can be removed, and the step coverage can be improved.
- the leak prevention layer when the leak prevention layer is thick, the number of pinholes is reduced and the step coverage is improved, so that a film having few defects can be obtained.
- the resistance of the leak prevention layer in the thickness direction is proportional to the product of the specific resistance and the film thickness of the leak prevention layer. It is preferred to be larger.
- the leak prevention layer is formed in a solid shape common to adjacent pixels.
- the resistance (sheet resistance) of the leak prevention layer in the direction horizontal to the substrate becomes small, and there is a possibility that adjacent pixels may be electrically shortened.
- the sheet resistance of the leak prevention layer is proportional to (specific resistance Z film thickness).
- the leak prevention layer when the leak prevention layer is thin, the resistance of the leak prevention layer in the thickness direction decreases, and the drive voltage of the element decreases in a normal portion.
- the leak prevention layer when the leak prevention layer is thin, the number of pinholes increases and the step coverage deteriorates, resulting in a film having many defects.
- the resistance of the leak prevention layer in the thickness direction is reduced, the effect of high resistance at high temperature at the defective portion may be reduced.
- the lower limit of the thickness of the leak prevention layer is that the resistance in the thickness direction of the leak prevention layer after the resistance is increased at a high temperature is equal to the thickness of the organic functional layer in the normal portion (other than the leak prevention layer). It is preferable that the resistance is set to be larger than the resistance in the direction. Further, it is preferable that the thickness is such that no defect occurs in the film. As a range satisfying this condition, the thickness of the leak prevention layer is preferably, for example, about 100 A.
- the leak prevention layer when the leak prevention layer is formed in a solid pattern in common between adjacent pixels, it is preferable that adjacent pixels are short-circuited and crosstalk does not occur.
- the range that satisfies this condition is a force that also depends on the size of the gap between adjacent pixels.
- the sheet resistance of the leak prevention layer is l Ovm 'cm) or more, and more preferably 10 ( ⁇ ). ⁇ ⁇ ) or more.
- a polymer material whose conductivity is increased by doping with an acid.
- conductive polymers such as polyaniline, polypyrrole, polythiophene, and polyfuran can be used. These polymers are doped with acids to increase conductivity. When these polymers are heated to a high temperature, the doped acid is undoped and the resistance value increases, resulting in a decrease in conductivity. I do. These materials can generally form a film by spin coating or printing.
- an inorganic acid such as hydrochloric acid, sulfuric acid, nitric acid, or acetic acid, formic acid, or oxalic acid can be used.
- an organic semiconductor whose resistance is increased by thermal decomposition as a material of the leak layer.
- an organic semiconductor such as a TCNQ (7'7'8'8-tetracyanoquinodimethane) complex can be used.
- TCNQ 7'7'8'8-tetracyanoquinodimethane
- these materials can form a film by an evaporation method. After the film is formed by vapor deposition, by applying a heat treatment as described above, defects such as pinholes can be reduced, and the step coverage can be improved.
- the organic EL device shown in FIG. 7 has an organic function in which a cathode 32 is formed on a substrate 31 and an electron injection layer 35, a light emitting layer 36, a hole transport layer 37, and a hole injection layer 38 are sequentially stacked thereon. Layer 34 is formed and anode 33 is formed on hole injection layer 38.
- the electron injection layer 35 functions as an electron injection layer that injects electrons into the light emitting layer 36 in a normal operating temperature range, and also functions as a leak prevention layer that suppresses overcurrent.
- the electron injection layer 35 is made of a material whose specific resistance increases at least in a high temperature region exceeding the maximum use temperature (maximum operating temperature or maximum storage temperature) of the product and increases the resistance. Subordinate The electron injection layer 35 has high resistance due to generation of Joule heat due to current concentration caused by defects. As a result, the current is suppressed, and damage to the element such as dielectric breakdown is prevented.
- FIG. 8 is a view showing another modification of the embodiment of the organic EL device according to the present invention.
- 8 has a cathode 42 formed on a substrate 41, and has an electron injection layer 45, a light-emitting layer 46, a hole transport layer 47, and a hole injection layer 48 sequentially stacked thereon.
- the organic functional layer 44 is formed, and the anode 43 is formed on the hole injection layer 48.
- the electron injection layer 45 functions as an electron injection layer for injecting electrons into the light emitting layer 46 in a normal use temperature range, and also functions as a leak prevention layer for suppressing overcurrent.
- the hole injection layer 48 functions as a hole injection layer for injecting electrons into the light emitting layer 46 in a normal use temperature range, and also functions as a leak prevention layer for suppressing overcurrent.
- the electron injecting layer 45 and the hole injecting layer 48 are made of a material whose specific resistance increases and increases its resistance at least in a high temperature range exceeding the maximum use temperature (maximum operating temperature or maximum storage temperature) of the product. I have.
- the electron injection layer 45 and the hole injection layer 48 have high resistance due to generation of Joule heat due to current concentration caused by defects. This suppresses the current and prevents damage to the element such as insulation rupture. In this way, two or more leak prevention layers are provided in the organic function.
- Example 1 an organic device was prepared based on the following procedure.
- ITO was deposited on a glass substrate by a 1500 A sputtering method.
- photoresist AZ611 2 (Tokyo Ohka Kogyo) was patterned on the ITO film.
- the substrate was immersed in a mixed solution of an aqueous solution of ferric chloride and hydrochloric acid, and the portions of the ITO not covered with the resist were etched. Thereafter, the glass substrate was immersed in acetone to remove the resist, thereby obtaining a predetermined ITO electrode pattern.
- a coating solution of a polyaniline derivative doped with an acid dissolved in an organic solvent was spin-coated on the glass substrate of (1). After wiping and removing the coating solution attached to the terminal portions other than the display portion of the substrate, the substrate was heated on a hot plate to evaporate the solvent, thereby obtaining a 450A polyurine film (leakage prevention layer).
- NPABP NPABP was formed at 250 A and Alq3 was formed at 600 A by an evaporation method as an organic functional layer other than the leak prevention layer. Further, an Al—Li alloy was formed by a ⁇ evaporation method as a cathode to complete an organic EL device. The size of the organic EL device determined by the intersection of the anode and the cathode was 2 mm ⁇ 2 mm.
- Example 1 As Comparative Example 1, exactly the same as Example 1 except that (2) of Example 1 was not performed (that is, the leak prevention layer was not formed), and the thickness of NPABP was set to 700 A in (3). Thus, the organic EL device was completed.
- the organic EL element of Example 1 and the organic EL element of Comparative Example 1 had the same total film thickness.
- a polyaniline film was formed on a glass substrate in exactly the same manner as in Example 1 (2) to form a sample.
- the sample was heated on a hot plate for 5 minutes at various temperatures. Heated for the sample, the sheet resistance was measured by the two-terminal method, and the film thickness was measured by the stylus-type film thickness meter Dektak, and the force resistivity was obtained as a result of each measurement.
- FIG. 9 is a graph showing the relationship between the heating temperature and the specific resistance of the poly-phosphorus film.
- the resistance value of the polyaniline derivative film increased about 100 times between 250 and 300 ° C. This is thought to be due to the fact that the doped acid was undoped by heat and the resistance was rapidly increased.
- This polyaniline film showed a sharp and significant increase in resistance in the temperature range of 250 to 300 ° C., and was found to be suitable as a leak prevention layer.
- Reverse voltages (minus to the anode and positive to the cathode) were applied to the devices prepared in Example 1 and Comparative Example, respectively, and the current flowing through the devices was measured. The measurement was performed twice for each sample.
- Figure 10 shows the measurement results.
- Example 1 showed an increase in current around 3 V and 5 V in the first measurement, which was thought to be caused by a short circuit between the anode and the cathode, but immediately returned to the normal current value. This is probably because a large amount of current temporarily flowed into the defect, but the current concentration was reduced by the effect of the leakage prevention layer. In the second measurement, the current did not increase, and the current value was small and smooth characteristics were obtained. This is probably because the main defect was repaired by the leak prevention layer when the voltage was applied for the first time.
- Example 2 An organic EL display panel was created by the following procedure.
- ITO was deposited on a glass substrate by a 1500A sputtering method.
- a photoresist AZ611 2 (manufactured by Tokyo Ohka Kogyo) was patterned on the ITO film.
- This substrate was immersed in a mixed solution of ferric chloride aqueous solution and hydrochloric acid, and the portion of the ITO not covered with the resist was etched. Thereafter, the glass substrate was immersed in acetone to remove the resist, thereby obtaining an electrode pattern on a stripe consisting of 256 lines.
- a coating solution of a polyaniline derivative dissolved in an organic solvent and doped with an acid was spin-coated on the glass substrate of (1). After wiping off and removing the coating solution adhering to the terminal portions other than the display portion of the substrate, the substrate was heated on a hot plate to evaporate the solvent to obtain a 450A polyaniline film (leakage prevention layer).
- NPABP NPABP was formed as an organic functional layer other than the leak prevention layer by 250 A and A1 q3 by a 600 A vapor deposition method.
- an Al_Li alloy was formed by a 1000 A vapor deposition method using a mask composed of 64 stripe patterns as a cathode. The size of one dot determined by the intersection of the anode and cathode is 0.3 mm x 0.3 mm, and the number of dots is 256 x 64 dots.
- a sealing plate having a desiccant fixed in the recessed portion was adhered to the substrate of (3) with an adhesive, to produce a passively driven organic EL panel.
- Comparative Example 2 As Comparative Example 2, the same procedure as in Example 1 was repeated except that (2) of Example 2 was not performed (that is, no leak prevention layer was formed), and the thickness of NPABP was changed to 700 A in ( 3 ). Completed an organic EL panel with X 64 dots. The organic EL device of Example 1 and the organic EL device of Comparative Example 1 had the same total film thickness.
- Example 2 The panels prepared in Example 2 and Comparative Example 2 were connected to a predetermined drive circuit and lit continuously for 500 hours in an atmosphere of 85 ° C., and then the cathode and the anode were short-circuited and failed. The number of dots was checked. The results are shown below.
- the panel of Example 2 having the leak prevention layer had less defects due to short-circuit than the panel of Comparative Example 2 having no leak prevention layer.
- the organic EL device includes an anode, a cathode, and an organic EL layer that emits light and is sandwiched between the anode and the cathode. It has at least a leak prevention layer whose resistance increases as the temperature rises. Therefore, even if an overcurrent occurs due to a defect in the organic functional layer, the resistance of the leak prevention layer increases due to the heat generated by the overcurrent and suppresses the current, thereby preventing element destruction due to a defect in the organic EL element. Can be prevented.
- the leak prevention layer is configured so that the step college is equal to or greater than that of the other layers, the leak prevention layer can cover the defective portion of the organic functional layer, and the effect of the present invention can be further enhanced. It becomes.
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03791212A EP1549110A4 (en) | 2002-08-30 | 2003-08-13 | ORGANIC EL ELEMENT |
AU2003255027A AU2003255027A1 (en) | 2002-08-30 | 2003-08-13 | Organic el element |
US10/525,822 US20060033427A1 (en) | 2002-08-30 | 2003-08-13 | Organic el element |
Applications Claiming Priority (2)
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JP2002255661A JP2004095388A (ja) | 2002-08-30 | 2002-08-30 | 有機el素子 |
JP2002-255661 | 2002-08-30 |
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WO2004021746A1 true WO2004021746A1 (ja) | 2004-03-11 |
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PCT/JP2003/010299 WO2004021746A1 (ja) | 2002-08-30 | 2003-08-13 | 有機el素子 |
Country Status (8)
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US (1) | US20060033427A1 (ja) |
EP (1) | EP1549110A4 (ja) |
JP (1) | JP2004095388A (ja) |
KR (1) | KR100714428B1 (ja) |
CN (2) | CN1695403A (ja) |
AU (1) | AU2003255027A1 (ja) |
TW (1) | TWI226206B (ja) |
WO (1) | WO2004021746A1 (ja) |
Cited By (1)
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WO2006036297A2 (en) * | 2004-09-17 | 2006-04-06 | 3M Innovative Properties Company | Organic electroluminescence device and method of production of same |
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US7183707B2 (en) * | 2004-04-12 | 2007-02-27 | Eastman Kodak Company | OLED device with short reduction |
JP2007012504A (ja) * | 2005-07-01 | 2007-01-18 | Toppan Printing Co Ltd | 有機el素子の製造方法及び有機el素子 |
JP2007066707A (ja) * | 2005-08-31 | 2007-03-15 | Denso Corp | 有機el素子の製造方法 |
JP2009021073A (ja) * | 2007-07-11 | 2009-01-29 | Sumitomo Chemical Co Ltd | 自発光型素子及び照明装置並びに表示装置 |
JP2009021104A (ja) * | 2007-07-12 | 2009-01-29 | Sumitomo Chemical Co Ltd | 有機発光素子の製造方法 |
JP5007170B2 (ja) * | 2007-07-20 | 2012-08-22 | 株式会社ジャパンディスプレイイースト | 有機el表示装置 |
DE102008019048B4 (de) | 2008-04-15 | 2012-03-01 | Novaled Ag | Lichtemittierendes organisches Bauelement und Verfahren zum Herstellen sowie Anordnung mit mehreren lichtemittierenden organischen Bauelementen |
DE102008019049B4 (de) * | 2008-04-15 | 2013-12-24 | Novaled Ag | Lichtemittierendes organisches Bauelement und Anordnung |
WO2009133501A1 (en) * | 2008-04-29 | 2009-11-05 | Philips Intellectual Property & Standards Gmbh | Oled device with current limiting layer |
WO2011044867A2 (de) * | 2009-10-14 | 2011-04-21 | Novaled Ag | Elektrooptisches, organisches halbleiterbauelement und verfahren zum herstellen |
CN101964354B (zh) * | 2010-08-20 | 2012-05-23 | 友达光电股份有限公司 | 有机发光装置、照明装置以及液晶显示器 |
US20130168665A1 (en) * | 2010-10-20 | 2013-07-04 | Ocean's King Lighting Science & Techning | Organic electroluminescent device and manufacturing method thereof |
CN102082165B (zh) * | 2010-11-05 | 2013-04-17 | 友达光电股份有限公司 | 有机发光装置及其制造方法 |
EP2960961B1 (en) * | 2013-04-01 | 2022-03-09 | LG Display Co., Ltd. | Organic light emitting element |
KR101946999B1 (ko) * | 2014-05-12 | 2019-02-12 | 엘지디스플레이 주식회사 | 유기발광소자 및 이의 제조방법 |
KR101925574B1 (ko) * | 2014-05-15 | 2018-12-05 | 엘지디스플레이 주식회사 | 유기발광소자 |
JP2017062884A (ja) | 2015-09-24 | 2017-03-30 | ソニー株式会社 | 表示装置及び発光装置 |
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- 2003-08-13 KR KR1020057003467A patent/KR100714428B1/ko not_active IP Right Cessation
- 2003-08-13 US US10/525,822 patent/US20060033427A1/en not_active Abandoned
- 2003-08-13 EP EP03791212A patent/EP1549110A4/en not_active Withdrawn
- 2003-08-13 AU AU2003255027A patent/AU2003255027A1/en not_active Abandoned
- 2003-08-13 WO PCT/JP2003/010299 patent/WO2004021746A1/ja active Application Filing
- 2003-08-18 TW TW092122607A patent/TWI226206B/zh not_active IP Right Cessation
- 2003-09-01 CN CNU032080050U patent/CN2653833Y/zh not_active Expired - Fee Related
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WO2006036297A2 (en) * | 2004-09-17 | 2006-04-06 | 3M Innovative Properties Company | Organic electroluminescence device and method of production of same |
WO2006036297A3 (en) * | 2004-09-17 | 2006-09-14 | 3M Innovative Properties Co | Organic electroluminescence device and method of production of same |
US7265489B2 (en) | 2004-09-17 | 2007-09-04 | 3M Innovative Properties Co. | Organic electroluminescence device and method of production of same |
Also Published As
Publication number | Publication date |
---|---|
CN2653833Y (zh) | 2004-11-03 |
EP1549110A4 (en) | 2009-06-24 |
KR100714428B1 (ko) | 2007-05-07 |
CN1695403A (zh) | 2005-11-09 |
AU2003255027A1 (en) | 2004-03-19 |
TWI226206B (en) | 2005-01-01 |
JP2004095388A (ja) | 2004-03-25 |
EP1549110A1 (en) | 2005-06-29 |
KR20050057041A (ko) | 2005-06-16 |
TW200404480A (en) | 2004-03-16 |
US20060033427A1 (en) | 2006-02-16 |
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