KR20170014455A - Organic Light Emitting Device and Method of manufacturing the same and Organic Light Emitting Display Device using the same - Google Patents

Abstract

The present invention relates to an organic light emitting device, a method for manufacturing the same and an organic light emitting display device using the same. The present invention comprises a first electrode, a second electrode and an organic layer between the first electrode and the second electrode. The organic layer includes molecules arranged in a specific direction by a groove installed on the upper part of the first electrode.

Description

TECHNICAL FIELD [0001] The present invention relates to an organic light emitting diode (OLED), a method of manufacturing the same, and an OLED display using the organic light emitting diode,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic light emitting device, and more particularly, to an organic light emitting device having improved efficiency, a manufacturing method thereof, and an organic light emitting display device using the same.

The organic light emitting device has a structure in which a light emitting layer is formed between a cathode for injecting electrons and an anode for injecting holes, and electrons generated in the cathode and holes generated in the anode are injected into the light emitting layer Injected electrons and holes combine to form an exciton, and the generated exciton emits light while falling from an excited state to a ground state.

Hereinafter, a conventional organic light emitting device will be described with reference to the drawings.

FIG. 1A is a schematic cross-sectional view of an organic light emitting device according to one embodiment of the present invention. FIG.

1A, an organic light emitting diode (OLED) according to an exemplary embodiment of the present invention includes a substrate 1, and an anode, a hole injection layer (HIL), and a light emitting layer, which are sequentially formed on the substrate 1, And includes a hole transporting layer (HTL), an emission layer (EML), an electron transporting layer (ETL), an electron injection layer (EIL), and a cathode.

The hole injection layer (HIL) is formed on the anode, and the hole transport layer (HTL) is formed on the hole injection layer (HIL).

The EML may be formed on the HTL, the ETL may be formed on the EML, the EIL may be formed on the ETL, And the cathode is formed on the electron injection layer (EIL).

Organic layers such as a hole injecting layer (HIL), a hole transporting layer (HTL), a light emitting layer (EML), an electron transporting layer (ETL) and an electron injecting layer (EIL) formed between the anode and the cathode are formed in a vacuum chamber In a vacuum deposition process or a solution process.

FIG. 1B is a schematic cross-sectional view illustrating a molecular arrangement of an organic light emitting device according to one embodiment of the present invention.

As shown in FIG. 1B, the organic light emitting diode according to the related art includes an organic layer OL between an anode and a cathode. The organic layer OL is composed of a plurality of molecules. In the OLED according to the related art, the plurality of molecules are irregularly arranged. Therefore, there is a problem that the light can not spread uniformly.

In the organic light emitting device, electrons injected from the cathode and holes injected from the anode emit light only in the light emitting layer (EML), and the light emitted from the cathode and the anode The more electrons and holes are hard to move due to the different properties of the layers. Therefore, a high driving voltage is required to move the electron and the hole to emit light to the organic light emitting device, which causes a decrease in efficiency and lifetime.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide an organic light emitting diode having improved light emitting efficiency, a method of manufacturing the same, and an organic light emitting diode display using the same.

According to an aspect of the present invention, there is provided an organic light emitting diode comprising a first electrode, a second electrode, and an organic layer disposed between the first electrode and the second electrode, And a plurality of molecules arranged in a predetermined direction by a groove provided on an upper surface of the organic light emitting device.

According to another aspect of the present invention, there is provided a method of manufacturing an organic light emitting diode, including forming a first electrode, forming a groove on the first electrode, forming a plurality of layers on the first electrode, And forming a second electrode on the organic layer, wherein the organic layer in contact with the upper surface of the first electrode among the plurality of layers formed on the first electrode is formed by a solution process A method of manufacturing an organic light emitting device is provided.

According to the present invention as described above, the following effects can be obtained.

According to an embodiment of the present invention, light is uniformly spread by arranging the molecules of the organic layer in a certain direction, and the luminous efficiency can be improved.

According to an embodiment of the present invention, the molecules and the molecules of the organic layer are arranged in a certain shape, so that electron and hole movements are facilitated without high voltage driving, and the efficiency and lifetime of the organic light emitting device can be improved.

The effects obtained in the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description .

FIG. 1A is a schematic cross-sectional view of an organic light emitting device according to one embodiment of the present invention. FIG.
FIG. 1B is a schematic cross-sectional view illustrating a molecular arrangement of an organic light emitting device according to one embodiment of the present invention.
2A is a schematic cross-sectional view of an organic light emitting device according to an embodiment of the present invention.
2B is a schematic cross-sectional view illustrating a molecular arrangement of an organic light emitting diode according to an embodiment of the present invention.
3 is a schematic cross-sectional view of an organic light emitting device according to another embodiment of the present invention.
4 is a schematic cross-sectional view of an organic light emitting device according to another embodiment of the present invention.
FIGS. 5A to 5E are manufacturing process diagrams illustrating a method of manufacturing an organic light emitting diode according to an embodiment of the present invention.
6 is a schematic cross-sectional view of an organic light emitting display device according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. In the case where the word 'includes', 'having', 'done', etc. are used in this specification, other parts can be added unless '~ only' is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

In the case of a description of a temporal relationship, for example, if the temporal relationship is described by 'after', 'after', 'after', 'before', etc., May not be continuous unless they are not used.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2A is a schematic cross-sectional view of an organic light emitting device according to an embodiment of the present invention.

2A, an organic light emitting device according to an embodiment of the present invention includes a substrate 10, an anode, an organic layer OL, and a cathode, which are sequentially stacked on the substrate 10, .

The anode is formed on the substrate 10. The anode may be made of a transparent conductive material having a high conductivity and work function, for example, indium tin oxide (ITO), indium zinc oxide (IZO), SnO 2 or ZnO. However, no.

The organic layer OL is formed on the anode and includes a hole injection layer (HIL), a hole transport layer (HTL), a light emitting layer (EML), an electron transport layer (ETL), and a hole injection layer .

The hole injection layer (HIL) is formed on the anode. The hole injecting layer (HIL) may be formed by using 4,4 ', 4 "-tris (3-methylphenylphenylamino) triphenylamine, CuPc or PEDOT / But is not limited thereto.

Such a hole injection layer (HIL) may be formed by a deposition process or a patterning process in a solution state, for example, a slit coating process, a spin coating process, or an inkjet printing process Inkjet printing) process.

On the upper surface of the anode, a groove is formed by a manufacturing process to be described later. At this time, the grooves formed on the top surface of the anode may be formed in a straight line shape in the first direction, but not necessarily, and may be formed in a shape that intersects the straight line shape in the second direction, a curve shape, or the like.

Thus, the molecules of the hole injection layer (HIL) are oriented by the grooves formed on the anode. In other words, the organic layer OL includes a plurality of layers. The hole injection layer HIL, which is in contact with the upper surface of the anode, is formed in a predetermined direction by the grooves of the anode And includes molecules that are arranged. The molecules of the hole injection layer (HIL) are arranged in a predetermined direction, so that the molecules are regularly arranged and the light can be uniformly spread.

In order to effectively align molecules in the groove formed on the anode, the hole injection layer (HIL), which is the organic layer OL contacting the upper surface of the anode, is preferably formed by a solution process . When the hole injection layer (HIL) is formed by a solution process, the distance between the molecules is shortened due to the evaporation of the solution during the solution drying process, and the interaction between the molecules is improved, so that the molecular orientation can be effectively performed.

In the case of forming the hole injection layer (HIL) by a deposition process, it is most preferable to form the HIL by a solution process because the molecules are hard to be aligned in a certain direction due to high mobility of molecules when heat is applied for the deposition process. It is preferable to use a low temperature.

The hole transport layer (HTL) is formed on the hole injection layer (HIL). The HTL may be TPD (N, N'-diphenyl-N, N'-bis (3-methylphenyl) -1,1'- -di (naphthalen-1-yl) -N, N'-diphenyl-benzidine), and the like, but the present invention is not limited thereto.

The hole transport layer (HTL) may be formed by a deposition process or a patterning process in a solution state, for example, a slit coating process, a spin coating process, or an inkjet printing process ) Process. ≪ / RTI >

The organic layer OL is an amorphous organic material having the property of being oriented in the same manner as a layer formed thereunder. Due to such a property, molecules of the organic layer (OL) except the layer which is in contact with the upper surface of the anode are oriented by the layer contacting the upper surface of the anode. Therefore, in the hole transport layer (HTL), the molecules are aligned in the same manner as the hole injection layer (HIL), and the molecules are uniformly arranged by arranging the molecules in a predetermined direction. In addition, since the molecules of the hole transport layer (HTL) and the hole injection layer (HIL) are aligned in the same direction, hole transfer between the hole transport layer (HTL) and the hole injection layer (HIL) The efficiency and lifetime of the organic light emitting device can be improved.

The light emitting layer (EML) is formed on the hole transport layer (HTL). The light emitting layer (EML) may be patterned through a deposition process or a patterning process in a solution state, a spin-coating process or an inkjet printing process after preparing a light-emitting layer composition in a solution state.

The light emitting layer (EML) is an amorphous organic material and has the property of being oriented in the same manner as a layer formed thereunder. Accordingly, the molecules of the light emitting layer (EML) are aligned in the same manner as the hole injection layer (HIL) and the hole transporting layer (HTL), and the molecules are uniformly arranged by arranging the molecules in a predetermined direction. Also, since the molecules of the hole injection layer (HIL) and the hole transport layer (HTL) are aligned with the molecules of the light emitting layer (EML), the hole injection layer (HIL) and the hole transport layer (HTL) Hole can be easily transferred between the organic light emitting device and the organic light emitting device, thereby improving the efficiency and lifetime of the organic light emitting device.

The electron transport layer (ETL) is formed on the light emitting layer (EML). The electron transport layer (ETL) may be composed of oxadiazole, triazole, phenanthroline, benzoxazole, benzthiazole, etc., but is not limited thereto no.

Such an electron transport layer (ETL) can be patterned by a deposition process or a patterning process in a solution state, a spin-coating process or an inkjet printing process after preparing an electron transport layer composition in a solution state. At this time, when the electron transport layer (ETL) is formed by a solution process, the solution of the electron transport layer (ETL) may damage the emission layer (EML) while melting the emission layer (EML) .

The electron transport layer (ETL) is an amorphous organic material and has the property of being oriented in the same manner as a layer formed thereunder. Therefore, in the electron transport layer (ETL), molecules are aligned in the same manner as the hole injection layer (HIL), the hole transport layer (HTL) and the emission layer (EML), and the molecules are uniformly arranged . In addition, since the molecules of the light emitting layer (EML) and the electron transporting layer (ETL) are aligned in the same direction, electron movement between the light emitting layer (EML) and the electron transporting layer (ETL) Efficiency and life can be improved.

The electron injection layer (EIL) is formed on the electron transport layer (ETL). The electron injection layer (EIL) may be made of LIF or lithium quinolate (LiQ), but is not limited thereto.

Such an electron injection layer (EIL) can be patterned through a deposition process or a patterning process in a solution state, a spin-coating process or an inkjet printing process after preparing the electron injection layer composition in a solution state have.

The electron injection layer (EIL) is an amorphous organic material and has the property of being oriented in the same manner as a layer formed below. Therefore, in the electron injection layer (EIL), molecules are aligned in the same manner as the hole injection layer (HIL), the hole transport layer (HTL), the emission layer (EML), and the electron transport layer (ETL) Can be uniformly spread. The molecules of the light emitting layer (EML) and the electron transporting layer (ETL) and the electron injection layer (EIL) are aligned in the same direction so that the light emitting layer (EML) Can be easily transferred to improve the efficiency and lifetime of the organic light emitting device.

The cathode is formed on the electron injection layer (EIL). The cathode may be made of a metal having a low work function, for example, aluminum (Al), silver (Ag), magnesium (Mg), lithium (Li), calcium (Ca) It is not.

2B is a schematic cross-sectional view illustrating a molecular arrangement of an organic light emitting diode according to an embodiment of the present invention.

As shown in FIG. 2B, the organic light emitting diode according to an exemplary embodiment of the present invention includes an organic layer OL between an anode and a cathode. The organic layer OL is composed of a plurality of molecules, and a plurality of molecules may be arranged in a predetermined direction by grooves formed on the top surface of the anode. Accordingly, the molecules can be regularly arranged and light can be uniformly spread, and electrons and holes can be easily moved without driving a high voltage, so that the efficiency and lifetime of the organic light emitting device can be improved.

At this time, in order to effectively orient the molecules, it is preferable that the molecule has an anisotropy molecular structure and a dipole moment characteristic. In addition, when the degree of horizontal orientation of molecules is larger than the degree of vertical orientation, light can be uniformly spread. In other words, the greater the degree to which the large surface of the molecule is parallel to the anode or the cathode, the more uniform the light can be spread out. However, even though a plurality of molecules constituting the organic layer OL are arranged uniformly regardless of the degree of horizontal orientation of molecules, movement of electrons and holes can be facilitated without driving a high voltage.

3 is a schematic cross-sectional view of an organic light emitting device according to another embodiment of the present invention.

3, the organic light emitting device according to another embodiment of the present invention includes a substrate 10, an anode sequentially stacked on the substrate 10, an organic layer OL, and a cathode The organic layer OL includes a first stack 30, a second stack 30, and a charge generating layer (CGL). The first stack 30 emits light of different colors. The remaining structures except for the first and second light emitting layers (EML), the charge generating layer (CGL), the second hole transporting layer (HTL2) and the second electron transporting layer (ETL2) are the same as those of the organic light emitting device according to the above- Repeated descriptions will be omitted.

The first stack 20 is formed on the anode to emit light of a first color, specifically blue (B) light having a shorter wavelength. The blue (B) light may have a peak wavelength range of 445 nm to 475 nm.

The first stack 20 includes a hole injection layer (HIL), a first hole transport layer (HTL1), a first light emitting layer (EML), and a first electron transport layer (ETL1) sequentially formed on the anode .

On the upper surface of the anode, a groove is formed by a manufacturing process to be described later. The molecules of the hole injection layer (HIL) are oriented by grooves formed on the anode. The first hole transport layer HTL1, the first emission layer EML, and the first electron transport layer (OLED), which are formed of organic materials of amorphous nature, are arranged in a predetermined direction by molecules of the hole injection layer (HIL) ETL1 are aligned in the same manner as the hole injection layer (HIL) formed in the lower part. Since the molecules of the first stack 20 are aligned in the same direction, light can be uniformly spread, and holes and elelctrons can be easily moved without a high driving voltage, thereby improving the efficiency and lifetime of the organic light emitting device. .

The first light emitting layer (EML) may be formed by doping a blue (B) dopant with a host material as a layer that emits blue (B) light. The first light emitting layer (EML) may be formed by doping a fluorescent blue (B) dopant into at least one fluorescent host material selected from the group consisting of an anthracene derivative, a pyrene derivative, and a perylene derivative. However, the present invention is not limited thereto.

The charge generating layer (CGL) is formed between the first stack 20 and the second stack 30 to balance charge between the first stack 20 and the second stack 30 . The charge generation layer CGL includes an N type charge generation layer N-CGL adjacent to the first stack 20 and a P type charge generation layer P adjacent to the second stack 30 -CGL). The N-type charge generation layer N-CGL injects electrons into the first stack 20 and the P-type charge generation layer P-CGL is injected into the second stack 30 by holes hole.

The second stack 30 is formed on the first stack 20 and the charge generation layer CGL. The second stack 30 is formed of an amorphous organic material and is oriented in the same manner as the first stack 20 formed at the bottom. Since the molecules of the first stack 20 and the second stack 30 are aligned in the same direction, light can be uniformly spread, and holes and elelctrons can be easily moved without a high driving voltage, The efficiency and lifetime of the device can be improved.

The second stack 30 emits light of a second color, in particular green (G) or yellowgreen (YG) light corresponding to a longer wavelength than the blue (B). The green (G) light may have a peak wavelength range of 510 nm to 545 nm, and the yellowgreen (YG) light may have a peak wavelength range of 552 nm to 575 nm.

The second stack 30 includes a second hole transport layer HTL2, a second light emitting layer EML, a second electron transport layer ETL2 and an electron injection layer EIL formed in order on the charge generation layer CGL. .

The second hole transport layer HTL2 may be made of the same material as the first hole transport layer HTL, but is not limited thereto.

The second light emitting layer (EML) may be formed by doping a host material with a green (G) or a yellow (YG) dopant as a layer emitting green (G) or yellow (YG) light. The second light emitting layer (EML) may be formed by doping phosphorescent green (G) or yellow (YG) dopants with a phosphorescent host material comprising a carbazole compound or a metal complex. The carbazole-based compound may include CBP (4,4-N, N'-dicarbazole-biphenyl), CBP derivative, mCP (N, N'-dicarbazolyl-3,5-benzene) The metal complex may include ZnPBO (phenyloxazole) metal complex or ZnPBT (phenylthiazole) metal complex.

The second electron transport layer (ETL) may be made of the same material as the first electron transport layer (ETL), but is not limited thereto.

4 is a schematic cross-sectional view of an organic light emitting device according to another embodiment of the present invention.

4, the organic light emitting device according to another embodiment of the present invention includes a substrate 10, an anode sequentially stacked on the substrate 10, a first stack 20, A second stack 30, a second charge generating layer CGL2, a third stack 40, and a cathode. The remaining structures except for the second charge generating layer CGL2, the third hole transporting layer HTL3, the third emitting layer EML and the third electron transporting layer ETL3 are the same as those of the organic light emitting device according to the above- A description thereof will be omitted.

The first stack 20 and the first charge generating layer CGL1 are formed on the anode. Molecules of the first stack 20 and the first charge generation layer CGL1 are arranged in a predetermined direction by grooves formed on the upper surface of the anode so that light can be uniformly spread, the hole and the elelctron can be easily moved and the efficiency and lifetime of the organic light emitting device can be improved.

The second stack 30 is formed on the first stack 20 and the first charge generating layer CGL1 and the second hole transporting layer HTL2, the second emitting layer EML, (ETL2).

The second stack 30 is formed of an amorphous organic material and is oriented in the same manner as the first stack 20 formed at the bottom. Since molecules of the first stack 20 and the second stack 30 are aligned in the same direction, holes and elelctrons can be easily moved without a high driving voltage, thereby improving the efficiency and lifetime of the organic light emitting device. have.

The second charge generating layer CGL2 is formed between the second stack 30 and the third stack 40 to balance the charges between the second stack 30 and the third stack 40 . In particular, the second charge generating layer (CGL2) 620 includes an N-type second charge generating layer (N-CGL) adjacent to the second stack 30 and a second charge generating layer Type second charge generation layer (P-CGL). The N-type second charge generation layer N-CGL injects electrons into the second stack 30 and the P-type second charge generation layer P-CGL injects electrons into the third stack 40 ) To inject holes.

The third stack 40 is formed on the second stack 30 to emit light of a third color, particularly red (R) light having a long wavelength. The red (R) light may have a peak wavelength range of 600 nm to 625 nm.

The third stack 40 includes a third hole transport layer HTL3, a third emission layer EML, and a third hole transport layer HTL3 formed on the second stack 30, more specifically, on the second charge generation layer CGL2, 3 electron transport layer (ETL3) and an electron injection layer (EIL).

The third stack 40 is formed of an amorphous organic material and is oriented in the same manner as the first and second stacks 20 and 30 formed at the bottom. The molecules of the first and second stacks 20 and 30 and the third stack 40 are aligned in the same direction so that the light can be uniformly spread and the movement of holes and elelctrons The efficiency and lifetime of the organic light emitting device can be improved.

The third hole transporting layer HTL3 may be made of the same material as the first hole transporting layer HTL1, but is not limited thereto.

The third light emitting layer (EML) may be formed by doping the host material with red (R) dopant as a layer emitting red (R) light. The host material used for the third emission layer (EML) may be a phosphorescent host material composed of a carbazole compound or a metal complex as in the second emission layer (EML). The red dopant may be a metal complex of iridium (Ir) or platinum (Pt), but is not limited thereto.

The third electron transport layer (ETL3) may be made of the same material as the first electron transport layer (ETL1), but is not limited thereto.

FIGS. 5A through 5E are cross-sectional views illustrating a method of manufacturing an organic light emitting diode according to an exemplary embodiment of the present invention. Referring to FIG. The organic light emitting device according to the above-described FIGS. 3 and 4 can be applied as well, by adding a step of forming a plurality of stacks which emit light different from each other. Hereinafter, repetitive description of the same constitution as the material of the constituent elements and the like will be omitted.

First, as shown in FIG. 5A, an anode is patterned on the substrate 10. Specifically, the anode is pattern-formed on the substrate 10 by a combination of an MOCVD process and a photolithography process.

Then, as shown in FIG. 5B, a rubbing process is performed using a rubbing roll on the top surface of the anode. When the rubbing process is performed, a micro-groove is formed in a predetermined direction on the upper surface of the anode.

Then, as shown in FIG. 5C, the hole injection layer (HIL) is patterned on the anode by a patterning process in a solution state, for example, a slit-coating process. When the hole injection layer (HIL) is patterned on the anode, the molecules of the hole injection layer (HIL) are automatically aligned by grooves formed on the upper surface of the anode.

Then, as shown in FIG. 5D, a hole transport layer (HTL) and a light emitting layer (EML) are sequentially patterned on the hole injection layer (HIL). Specifically, the hole transport layer (HIL) may be formed on the HIL by a solution patterning process, for example, slit coating, inkjet printing, or spin coating. HTL is formed on the hole transport layer HTL by a patterning process such as slit coating, inkjet printing, or spin coating on the HTL, (EML) can be pattern-formed. However, it is not necessarily limited thereto, and may be formed through a deposition process.

When the HTL and the EML are formed on the HIL, the hole transport layer (HTL) and the light emitting layer (EML) may be formed in the same manner as the layers formed under the molecules. The molecules of the hole injection layer (HIL) are arranged in a predetermined direction. The molecules of the hole transport layer (HTL), the light emitting layer (EML) and the hole injection layer (HIL) are arranged in a predetermined direction so that the light can be uniformly spread and holes can be moved easily without a high driving voltage. The efficiency and lifetime of the device can be improved.

In the case of forming the hole transport layer (HTL) and the light emitting layer (EML) by a vapor deposition process, it is preferable to use a low temperature because the molecules are not fixed in the grooves when heat is applied for the vapor deposition process, Do.

Then, as shown in FIG. 5E, an electron transport layer (ETL), an electron injection layer (EIL), and a cathode may be sequentially formed on the emission layer (EML) through a deposition process. However, it is not necessarily limited thereto, and may be formed through a solution process.

FIG. 6 is a schematic cross-sectional view of an organic light emitting display device according to an embodiment of the present invention, which uses the organic light emitting device according to the above-described FIG. This is also applicable to the organic light emitting element according to the above-described FIG. 3 and FIG.

6, the OLED display includes a substrate 10, a thin film transistor layer 200, a color filter 300, a planarization layer 400, a bank layer 500, An anode, an organic layer 600, and a cathode.

The substrate 10 may be made of glass, or a transparent plastic, such as polyimide, which is capable of bending or rolling, but is not limited thereto.

The thin film transistor layer 200 is formed on the substrate 10. The thin film transistor layer 200 includes a gate electrode 210, a gate insulating layer 220, a semiconductor layer 230, a source electrode 240a, a drain electrode 240b, and a passivation layer 250.

The gate electrode 210 is patterned on the substrate 10. The gate insulating layer 220 is formed on the gate electrode 210 and the semiconductor layer 230 is formed on the gate insulating layer 220 The source electrode 240a and the drain electrode 240b are patterned so as to face each other on the semiconductor layer 230. The protective layer 250 is formed on the source electrode 240a and the source electrode 240a, And is formed on the drain electrode 240b.

The color filter 300 is formed to overlap the organic layer 600 of the organic light emitting device so that light emitted from the organic layer 600 can be emitted toward the substrate 10 via the color filter 300 have. The color filter 300 may include a red color filter, a green color filter, and a blue color filter, which are separately formed for each pixel. The color filter 300 is applied when the white light is emitted from the organic light emitting device, and therefore, the organic light emitting device emits blue, green, or red light other than white light, for example, The color filter 60 may be omitted.

The planarization layer 400 is formed on the thin film transistor layer 200 and the color filter 300 to planarize the substrate surface. The planarization layer 400 may be formed of an organic insulating film such as photo-acryl, but is not limited thereto.

The anode is formed on the planarization layer 400 and is connected to the drain electrode 240b of the thin film transistor.

The bank layer 500 is formed on the anode and is patterned in a matrix structure to define pixel regions.

The organic layer 600 is formed on the anode and is formed in the pixel region defined by the bank layer 500 in particular. The organic layer 600 includes a hole injection layer (HIL), a hole transport layer (HTL), a light emitting layer (EML), an electron transport layer (ETL), and an electron injection layer (EIL) 2A, the repetitive description will be omitted.

The cathode is formed on the organic layer 600. A common voltage may be applied to the cathode so that the cathode may be formed on the bank layer 500 as well as the organic layer 600 in each pixel.

Although not shown, an encapsulation may be formed on the cathode to prevent oxygen or moisture from penetrating into the organic layer 600. The encapsulation may be formed by alternately laminating different inorganic materials, alternately stacking an inorganic material and an organic material, or may be a metal layer bonded by an adhesive.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those embodiments and various changes and modifications may be made without departing from the scope of the present invention. . Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of equivalents should be interpreted as being included in the scope of the present invention.

10: substrate Anode: anode
HIL: Hole injection layer HTL:
EML: light emitting layer ETL: electron transporting layer
EIL: electron injection layer Cathode: cathode
CGL: charge generation layer

Claims (11)

A first electrode and a second electrode; And
And an organic layer provided between the first electrode and the second electrode,
Wherein the organic layer includes molecules arranged in a predetermined direction by a groove provided on an upper surface of the first electrode. The method according to claim 1,
Wherein the molecules contained in the organic layer have an anisotropic molecular structure. 3. The method of claim 2,
Wherein a degree of horizontal orientation of molecules contained in the organic layer is greater than a degree of vertical orientation. The method according to claim 1,
Wherein a groove provided on an upper surface of the first electrode is linearly formed in a first direction. The method according to claim 1,
Wherein the organic layer includes a plurality of layers, and the molecules arranged in the predetermined direction are included in a layer in contact with an upper surface of the first electrode. 6. The method of claim 5,
Wherein an organic layer except a layer in contact with an upper surface of the first electrode is oriented by a layer in contact with an upper surface of the first electrode. The method according to claim 1,
Wherein the organic layer comprises a plurality of stacks emitting light of different colors. Forming a first electrode;
Forming a groove on an upper surface of the first electrode;
Forming an organic layer comprising a plurality of layers on the first electrode; And
And forming a second electrode on the organic layer,
Wherein an organic layer in contact with an upper surface of the first electrode among a plurality of layers formed on the first electrode is formed by a solution process. 9. The method of claim 8,
Wherein the step of forming the organic layer includes a step of forming a plurality of stacks which emit light different from each other. 9. The method of claim 8,
Wherein the step of forming the groove on the upper surface of the first electrode comprises a rubbing step. Board;
A thin film transistor provided on the substrate; And
And an organic light emitting element whose emission is controlled by the thin film transistor,
Wherein the organic light emitting device comprises the organic light emitting device according to any one of claims 1 to 7.

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