KR102258673B1 - 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 provides an organic light emitting device with improved efficiency and life by improving the interface characteristics and energy level difference between the light emitting layer formed by a solution process and the blue common layer formed by the deposition process, and an organic light emitting display device using the same. The organic light-emitting device according to the present invention includes a red pixel, a green pixel, and a blue pixel, and the red and green pixels include an emission layer, an interface layer, a blue common layer, and an electron transport layer sequentially provided between an anode and a cathode. In addition, the interface layer may include a host material of the emission layer and an organic material capable of transporting electrons.

Description

An organic light emitting device, a manufacturing method thereof, and an organic light emitting display device using the same

The present invention relates to an organic light-emitting device, and more particularly, to an organic light-emitting device with improved efficiency and lifetime, and a method of manufacturing the same.

The organic light-emitting device has a structure in which an emission layer is formed between a cathode injecting electrons and an anode injecting holes, and electrons generated at the cathode and holes generated at the anode are inside the emission layer. When injected into, the injected electrons and holes are combined to generate excitons, and the generated excitons fall from an excited state to a ground state to emit light.

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

1 is a schematic cross-sectional view of an organic light-emitting device according to an exemplary embodiment.

As can be seen from FIG. 1, an organic light emitting device according to a conventional exemplary embodiment includes a substrate 1 and a red (R) pixel, a green (G) pixel, and a blue (B) pixel formed on the substrate 1. It includes a pixel.

The red (R) and green (G) pixels are formed in the same pattern, and the blue (B) pixel is formed in a different pattern from the red (R) and green (G) pixels.

Specifically, the red (R) pixel and the green (G) pixel are sequentially stacked anode (Anode), a hole injection layer (HIL), a hole transport layer (HTL), an emitting layer (Emitting Layer: EML), a blue common layer (BCL), an electron transporting layer (ETL), an electron injecting layer (EIL), and a cathode.

On the other hand, the blue (B) pixel has an anode, a hole injection layer (HIL), a hole transport layer (HTL), a blue common layer (BCL), an electron transport layer (ETL), and electron injection that are sequentially stacked. It comprises a layer (EIL), and a cathode (Cathode).

The hole injection layer (HIL), the hole transport layer (HTL), the emission layer (EML) of the red (R) pixel, and the emission layer (EML) of the green (G) pixel are formed by a soluble process, and the blue color is common. The layer (Blue Common Layer: BCL), the electron transport layer (ETL), and the electron injection layer (EIL) are formed by an evaporation process.

However, such a conventional organic light emitting device has the following problems.

There is a problem in that device characteristics in the blue (B) pixel are very deteriorated due to differences in interface characteristics and energy levels between the light emitting layer EML formed by a solution process and the blue common layer BCL formed by a deposition process. That is, due to the difference in energy level between the hole transport layer (HTL) and the blue common layer (BCL), holes are not smoothly injected into the blue common layer (BCL), and thus electrons from the hole transport layer (HTL) And holes are combined to generate excitons, so device efficiency is degraded.

The present invention was conceived to solve the above-described problems, and an organic light emitting device having improved efficiency and life by improving the difference in energy level and interface characteristics between the light emitting layer formed by the solution process and the blue common layer formed by the deposition process, and a method of manufacturing the same And it is a technical problem to provide an organic light emitting display device using the same.

In order to achieve the above-described technical problem, the present invention includes a red pixel, a green pixel, and a blue pixel, and the red pixel and the green pixel are a light emitting layer, an interface layer, a blue common layer, and an electron transport layer which are sequentially provided between an anode and a cathode. Including, the interface layer provides an organic light-emitting device comprising a host material of the emission layer and an organic material having electron transport capability.

The present invention also provides a process of forming a hole transport layer on each of a red pixel, a green pixel, and a blue pixel, forming a red emission layer on the hole transport layer formed on the red pixel, and forming a green emission layer on the hole transport layer formed on the green pixel. A process of forming an interface layer on each of the red, green, and blue pixels, a process of forming a blue common layer on each of the red, green, and blue pixels, and the red, green, and blue pixels, respectively A method of manufacturing an organic light-emitting device comprising a step of forming an electron transport layer in, wherein the interface layer is formed by using a host material of the emission layer and an organic material having electron transport capability.

The present invention also provides an organic light emitting display device including a substrate, a thin film transistor provided on the substrate, and an organic light emitting device in which light emission is controlled by the thin film transistor.

According to the present invention, by forming an interface layer including a host material of the emission layer and an organic material having electron transport capability between the emission layer of the red pixel and the green pixel formed by the solution process and the blue common layer formed by the deposition process, the interface characteristics and energy By improving the level difference, it improves the efficiency and life of the device.

In addition to the effects of the present invention mentioned above, other features and advantages of the present invention will be described below or will be clearly understood by those of ordinary skill in the art from such technology and description.

1 is a schematic cross-sectional view of an organic light-emitting device according to an exemplary embodiment.
2 is a schematic cross-sectional view of an organic light-emitting device according to an embodiment of the present invention.
3A to 3D are schematic cross-sectional views of a manufacturing process of an organic light-emitting device according to an embodiment of the present invention.
4 is a graph showing a spectrum of an organic light-emitting device according to the present invention.
5 is a schematic cross-sectional view of an organic light emitting display device according to an exemplary embodiment of the present invention.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments make the disclosure of the present invention complete, and the general knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to the possessor, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are exemplary, and thus the present invention is not limited to the illustrated matters. The same reference numerals refer to the same elements throughout the specification. In addition, in describing the present invention, when it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. When'include','have', and'consist of' mentioned in the present specification are used, other parts may be added unless'only' is used. In the case of expressing the constituent elements in the singular, it includes the case of including the plural unless specifically stated otherwise.

In interpreting the constituent elements, it is interpreted as including an error range even if there is no explicit description.

In the case of a description of the positional relationship, for example, if the positional relationship of two parts is described as'upper','upper of','lower of','next to','right' Or, unless'direct' is used, one or more other parts may be located between the two parts.

In the case of a description of a temporal relationship, for example, when a temporal predecessor relationship is described as'after','following','after','before', etc.,'right' or'direct' It may also include cases that are not continuous unless this is used.

First, second, etc. are used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one component from another component. Accordingly, the first component mentioned below may be a second component within the technical idea of the present invention.

Each of the features of the various embodiments of the present invention can be partially or entirely combined or combined with each other, technically various interlocking and driving are possible, and each of the embodiments may be independently implemented with respect to each other or can be implemented together in an association relationship. May be.

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

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

As can be seen from FIG. 2, the organic light emitting device according to an embodiment of the present invention includes a substrate 1 and a red (R) pixel, a green (G) pixel, and a blue (B) pixel formed on the substrate 1. ) Including pixels.

The red (R) and green (G) pixels are formed in the same pattern, and the blue (B) pixel is formed in a different pattern from the red (R) and green (G) pixels.

Specifically, the red (R) pixel and the green (G) pixel are sequentially stacked anode (Anode), a hole injection layer (HIL), a hole transport layer (HTL), a light emitting layer (EML), an interfacial layer (Interfacial Layer), blue It includes a common layer (BCL), an electron transport layer (ETL), an electron injection layer (EIL), and a cathode.

The blue (B) pixel includes an anode, a hole injection layer (HIL), a hole transport layer (HTL), an interfacial layer, a blue common layer (BCL), an electron transport layer (ETL), and electron injection. It comprises a layer (EIL), and a cathode (Cathode).

The hole injection layer (HIL), the hole transport layer (HTL), the emission layer (EML) of the red (R) pixel, and the emission layer (EML) of the green (G) pixel are formed by a soluble process, and the blue color is common. The layer (BCL), the electron transport layer (ETL), and the electron injection layer (EIL) are formed by an evaporation process. The interfacial layer may be formed by an evaporation process, but in some cases, it may be formed by a solution process.

The anode is patterned on the substrate 1 in the red (R), green (G) and blue (B) pixels, respectively. The anode may be made of a transparent conductive material having high conductivity and work function, for example, Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), SnO2, or ZnO, but it is not necessarily limited thereto. no.

Such an anode may be patterned for each pixel by a combination of a Metal Organic Chemical Vapor Deposition (MOCVD) process and a photolithography process.

The hole injection layer HIL is patterned on the anode of the red (R) pixel, green (G) pixel, and blue (B) pixel, respectively. The hole injection layer (HIL) is MTDATA (4,4',4"-tris(3-methylphenylphenylamino)triphenylamine)triphenylamine), CuPc (copper phthalocyanine) or PEDOT/PSS (poly(3,4-ethylenedioxythiphene)), polystyrene sulfonate ), etc., but is not necessarily limited thereto.

The hole injection layer (HIL) is a patterning process in a solution state, for example, after preparing a hole injection layer composition in a solution state, a pattern for each pixel is performed through a spin-coating or inkjet printing process. Can be formed.

The hole transport layer HTL is patterned on the hole injection layer HIL in the red (R), green (G), and blue (B) pixels, respectively. The hole transport layer (HTL) is TPD (N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'-bi-phenyl-4,4'-diamine) or NPB (N,N It may be made of'-di(naphthalen-1-yl)-N,N'-diphenyl-benzidine), but is not limited thereto.

The hole transport layer (HTL) is a patterning process in a solution state, for example, after preparing a hole transport layer composition in a solution state, a pattern can be formed for each pixel through a spin-coating or inkjet printing process. I can.

Meanwhile, when forming the hole transport layer HTL, it is preferable that the hole injection layer HIL is not damaged by a solvent present in the solution for the hole transport layer HTL. Accordingly, it is preferable that the organic material having hole injection properties contained in the hole injection layer HIL is not dissolved in a solvent present in the solution for the hole transport layer HTL. For example, an organic material having hole injection properties contained in the hole injection layer (HIL) uses an organic material that is soluble in water but is not soluble in a specific organic solvent, and an organic material having hole transport properties included in the hole transport layer (HTL) When an organic material dissolved in the specific organic solvent is used, the hole injection layer HIL may not be damaged when the hole transport layer HTL is formed by a solution process.

In addition, when forming the emission layer EML, it is preferable that the hole transport layer HTL is not damaged by a solvent present in the solution for the emission layer EML. To this end, a cross-linking agent is added to the hole transport layer HTL to improve the bonding strength of the hole transport layer HTL. That is, when a crosslinking agent is included in the hole transport layer (HTL), the bonding strength of organic substances is improved by the crosslinking agent, so that the hole transport layer (HTL) can be prevented from being dissolved by a solvent present in the solution for the light emitting layer (EML) have.

The emission layer EML is patterned on the hole transport layer HTL in the red (R) and green (G) pixels, respectively.

The emission layer EML patterned on the red (R) pixel contains an organic material capable of emitting red (R) light, for example, red (R) light having a peak wavelength range of 550 nm to 730 nm. I can.

The emission layer EML patterned on the green (R) pixel contains an organic material capable of emitting green (G) light, for example, green (G) light having a peak wavelength range of 490 nm to 600 nm. I can.

The light emitting layer (EML) is a patterning process in a solution state, for example, after preparing a light emitting layer composition in a solution state, and then through a spin-coating or inkjet printing process, the red (R) pixel and the green ( G) Patterns may be formed for each pixel.

The interfacial layer is formed on the entire surface of the substrate 1 including the red (R) pixel, green (G) pixel, and blue (B) pixel. That is, the interface layer extends from the red (R) and green (G) pixels to the blue (B) pixels.

Since such an interfacial layer is formed on the entire surface of the substrate 1, it can be formed by a deposition process without a separate shadow mask. Specifically, the interfacial layer is formed on the emission layer EML in the red (R) and green (G) pixels, and on the hole transport layer HTL in the blue (B) pixel. In addition, since the blue common layer (BCL) is formed on the interfacial layer, the interfacial layer is the upper surface of the red (R) emission layer (EML) and the blue color in the red (R) pixel. The green (G) pixel comes into contact with the lower surface of the common layer BCL, and the green (G) pixel comes into contact with the upper surface of the green (G) emission layer EML and the lower surface of the blue common layer BCL. In may be in contact with an upper surface of the hole transport layer HTL and a lower surface of the blue common layer BCL.

The interfacial layer includes a host material of the emission layer EML. As described above, since the interfacial layer includes the host material of the emission layer EML, an interface characteristic between the emission layer EML and the interfacial layer may be improved.

In addition, the interfacial layer includes an organic material capable of transporting electrons. As described above, since the interfacial layer contains an organic material having electron transport capability, in the case of the red (R) and green (G) pixels, from the blue common layer (BCL) to the emission layer (EML). The electron transport is smooth, improving the efficiency and life characteristics of the device.

In particular, the organic material having electron transport capability included in the interfacial layer may include the host material of the blue common layer BCL or may include the same material as the electron transport layer ETL. When the organic material having electron transport capability includes the host material of the blue common layer (BCL), the interface characteristics between the interfacial layer and the blue common layer (BCL) may be improved, and the An interfacial layer and the blue common layer BCL may be formed in a continuous process in the same process chamber. That is, the interfacial layer is formed by including the host material of the emission layer EML in the host material of the blue common layer BCL, and then the blue common layer excluding only the host material of the emission layer EML. Since (BCL) can be formed, there is an advantage in that the interfacial layer and the blue common layer BCL can be formed in a continuous process in the same process chamber.

In addition, the concentration of the host material of the emission layer EML included in the interfacial layer gradually decreases from the lower region to the upper region of the interfacial layer, and the interfacial layer The organic material having an electron transport capability contained in the interfacial layer may be formed with a concentration gradually decreasing from an upper region to a lower region of the interfacial layer As described above, the closer to the emission layer EML, the closer to the emission layer EML. ), and when the concentration of the host material of the emission layer EML is decreased as the concentration of the host material increases as the distance from the emission layer EML increases, the interface characteristics between the interfacial layer and the emission layer EML And energy level difference can be effectively improved.

Meanwhile, since the interfacial layer includes the host material of the blue common layer (BCL) having an electron transport function or the same material as the electron transport layer (ETL), red (R) and green (G) are included. ) It does not affect the device characteristics in the pixel. However, when the thickness of the interfacial layer becomes thicker than a certain amount, a light emitting region is formed toward the interfacial layer, thus reducing the efficiency and lifetime of the device. Therefore, it is preferable that the thickness of the interfacial layer is 5 nm or less.

The blue common layer BCL is formed on the entire surface of the substrate 1 including the red (R) pixel, green (G) pixel, and blue (B) pixel. That is, the blue common layer BCL extends from the red (R) and green (G) pixels to the blue (B) pixels.

Since the blue common layer BCL is formed on the entire surface of the substrate 1, it may be formed by a deposition process without a separate shadow mask.

The blue common layer BCL basically functions as an emission layer of blue light in a blue (B) pixel. Accordingly, the blue common layer BCL includes a host material for emitting blue light.

The blue common layer BCL of the blue (B) pixel may emit blue light having a peak wavelength range of 430 nm to 490 nm.

The electron transport layer ETL is formed on the blue common layer BCL in the red (R) pixel, green (G) pixel, and blue (B) pixel. The electron transport layer (ETL) may be made of oxadiazole, triazole, phenanthroline, benzoxazole, or benzthiazole, but is not necessarily limited thereto. no.

Like the blue common layer BCL, the electron transport layer ETL may be formed on the blue common layer BCL by a deposition process without a separate shadow mask.

The electron injection layer EIL is formed on the electron transport layer ETL in the red (R) pixel, green (G) pixel, and blue (B) pixel. The electron injection layer EIL may be formed of LIF or lithium quinolate (LiQ), but is not limited thereto.

Such an electron injection layer EIL may also be formed on the electron transport layer ETL by a deposition process without a separate shadow mask.

The cathode may be made of a metal having a low work function, for example, aluminum (Al), silver (Ag), magnesium (Mg), lithium (Li) or calcium (Ca), but is limited thereto. It is not.

Such a cathode is also formed on the entire surface of the substrate 1, and thus, can be formed by a deposition process without a separate shadow mask.

3A to 3D are manufacturing process diagrams illustrating a method of manufacturing an organic light-emitting device according to an embodiment of the present invention, which relates to a method of manufacturing the organic light-emitting device according to FIG. 2 described above. Hereinafter, repeated descriptions of the same components as described above, such as materials of components, may be omitted.

First, as can be seen from FIG. 3A, an anode, a hole injection layer (HIL), and a hole transport layer (HTL) are applied to each of the red (R) pixels, green (B) pixels, and blue (B) pixels on the substrate 1. ) In order to form a pattern.

Specifically, the anode is patterned on the substrate 1 by a combination of a MOCVD process and a photolithography process, and a patterning process in a solution state on the anode, for example, in a solution state. After preparing the hole injection layer composition, patterning the hole injection layer (HIL) through an inkjet printing or spin-coating process, and a patterning process in a solution state on the hole injection layer (HIL) , For example, after preparing a hole transport layer composition in a solution state, a hole transport layer (HTL) is patterned through an inkjet printing or spin-coating process.

Next, as can be seen in FIG. 3B, a pattern is formed on each of the red (R) pixels and the green (G) pixels on the hole transport layer HTL.

Specifically, after preparing a patterning process in a solution state on the hole transport layer (HTL), e.g., a light emitting layer composition in a solution state, red (R) through an inkjet printing or spin-coating process The emission layer EML and the green (G) emission layer EML are patterned.

Next, as shown in FIG. 3C, an interfacial layer is formed on the entire surface of the substrate 1 including the red (R) pixel, green (G) pixel, and blue (B) pixel.

Specifically, the interfacial layer (Interfacial layer) by vacuum evaporation without a shadow mask on the top surface of the emission layer (EML) of the red (R) pixel and the green (G) pixel and the hole transport layer (HTL) of the blue (B) pixel. Layer).

The interfacial layer is formed using a host material of the emission layer (EML) and an organic material having electron transport capability, and the organic material having electron transport capability is deposited including the host material of the blue common layer (BCL). In another embodiment, the host material of the emission layer EML and the organic material having the electron transport capability may include the same material as the electron transport layer ETL.

In such a process, the interfacial layer is formed by including the host material of the emission layer EML in the host material of the blue common layer BCL, and then, except for the host material of the emission layer EML. Since the blue common layer BCL can be formed, there is an advantage in that the interfacial layer and the blue common layer BCL can be formed in a continuous process in the same process chamber.

Next, as can be seen from FIG. 3D, a blue common layer (BCL), an electron transport layer (ETL), and a blue common layer (BCL), an electron transport layer (ETL) on the entire surface of the substrate 1 including a red (R) pixel, a green (G) pixel, and a blue (B) pixel, An electron injection layer (EIL) and a cathode (Cathode) are sequentially formed.

Specifically, a blue common layer BCL is deposited on an interfacial layer of the red (R) pixel, green (G) pixel, and blue (B) pixel by a deposition process without a shadow mask. The process of forming the blue common layer is performed by depositing a host material for emitting blue light.

In addition, the electron transport layer (ETL) is deposited on the blue common layer (BCL) by a deposition process without a shadow mask, and the electron injection layer (EIL) is deposited on the electron transport layer (ETL) by a deposition process without a shadow mask. Then, the cathode is deposited on the electron injection layer EIL by a deposition process without a shadow mask.

4 is a graph showing a spectrum of an organic light-emitting device according to the present invention.

As can be seen from FIG. 4, it can be seen that the concentration of light in the organic light-emitting device according to the present invention is higher than that of the conventional organic light-emitting device, and luminous efficiency is increased by being clear.

5 is a schematic cross-sectional view of an organic light-emitting display device according to an exemplary embodiment of the present invention, which uses the organic light-emitting device of FIG. 2 described above.

As can be seen from FIG. 5, the organic light emitting display device according to an embodiment of the present invention includes a substrate 1, a thin film transistor layer 200, a planarization layer 300, a bank layer 400, an anode, and an organic layer. 500, and a cathode (Cathode).

The substrate 1 may be glass or a bendable or bendable transparent plastic such as polyimide, but is not limited thereto.

The thin film transistor layer 200 is formed on the substrate 1. 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 protective layer 250.

The gate electrode 210 is patterned on the substrate 1, the gate insulating layer 220 is formed on the gate electrode 210, and the semiconductor layer 230 is formed of the gate insulating layer 220. ), the source electrode 240a and the drain electrode 240b are patterned to face each other on the semiconductor layer 230, and the protective layer 250 is formed with the source electrode 240a. It is formed on the drain electrode 240b.

The thin film transistor shown in the thin film transistor layer 200 relates to a driving thin film transistor, and the drawing shows a driving thin film transistor having a bottom gate structure in which the gate electrode 210 is formed under the semiconductor layer 230 However, a driving thin film transistor having a top gate structure in which the gate electrode 210 is formed on the semiconductor layer 230 may be formed. Light emission of the organic light emitting device is controlled by such a driving thin film transistor.

The planarization layer 300 is formed on the thin film transistor layer 200 to planarize the substrate surface. The planarization layer 300 may be formed of an organic insulating film such as photoacrylic, but is not limited thereto.

The anode is formed on the planarization layer 300 and is connected to the drain electrode 240b of the thin film transistor.

The bank layer 400 is formed on the anode and is patterned in a matrix structure to define a pixel area.

The organic layer 500 is formed on the anode, and in particular, is formed in a pixel region defined by the bank layer 400. Although the organic layer 500 is not specifically shown, in the red (R) and green (G) pixels, a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML), an interfacial layer, and a blue color It includes a common layer (BCL), an electron transport layer (ETL), and an electron injection layer (EIL), and in the blue (B) pixel, a hole injection layer (HIL), a hole transport layer (HTL), and an interfacial layer , A blue common layer (BCL), an electron transport layer (ETL), and an electron injection layer (EIL) are included, and since each layer is the same as in FIG. 2, a repeated description will be omitted.

The cathode is formed on the organic layer 500. A common voltage may be applied to the cathode, and thus, the cathode may be formed on the bank layer 400 as well as the organic layer 500 in each pixel.

Meanwhile, although not shown, an encapsulation layer is formed on the cathode to prevent oxygen or moisture from penetrating into the organic layer 500. Such encapsulation layers may be formed in a structure in which different inorganic materials are alternately stacked, inorganic materials and organic materials may be alternately stacked, or may be formed of a metal layer bonded by an adhesive.

The organic light emitting display device according to an embodiment of the present invention may be formed in a so-called top emission method in which light emitted from the organic layer 500 is emitted upward, or in the organic layer 500 The emitted light may be formed in a so-called bottom emission method in which the emitted light is emitted toward the lower substrate 1.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope of the technical matters of the present invention. It will be obvious to those who have the knowledge of. Therefore, the scope of the present invention is indicated by the claims to be described later, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

1: Substrate Anode: Anode
HIL: hole injection layer HTL: hole transport layer
EML: Emitting layer Interfacial Layer: Interfacial layer
ETL: electron transport layer EIL: electron injection layer
Cathode: cathode 200: thin film transistor layer
300: planarization layer 400: bank layer
500: organic layer

Claims (11)

Including a red pixel, a green pixel and a blue pixel,
The red and green pixels include a light emitting layer, an interface layer, a blue common layer, and an electron transport layer sequentially provided between an anode and a cathode,
The interface layer includes a host material of the emission layer and an organic material having electron transport capability,
The concentration of the host material of the emission layer included in the interface layer gradually decreases from the lower region to the upper region of the interface layer,
The organic light-emitting device having the electron transport capability contained in the interface layer includes the same material as the electron transport layer, and the concentration gradually decreases from an upper region to a lower region of the interface layer. delete delete delete The method of claim 1,
The interface layer is an organic light-emitting device in contact with an upper surface of the emission layer and a lower surface of the blue common layer. The method of claim 1,
The interface layer and the blue common layer extend to the blue pixel. Forming a hole transport layer on each of the red, green, and blue pixels;
Forming a red emission layer on the hole transport layer formed in the red pixel and forming a green emission layer on the hole transport layer formed in the green pixel;
Forming an interface layer on each of the red, green, and blue pixels;
Forming a blue common layer on each of the red, green, and blue pixels; And
And forming an electron transport layer on each of the red, green, and blue pixels,
The process of forming the interface layer includes a process of supplying a host material of the emission layer and an organic material having electron transport capability into a deposition chamber, and at this time, the supply amount of the host material of the emission layer gradually decreases and The supply of organic matter gradually increases,
The method of manufacturing an organic light-emitting device, wherein the organic material having electron transport capability includes the same material as the electron transport layer. The method of claim 7,
The hole transport layer, the red emission layer, and the green emission layer are formed by a solution process, and the blue common layer and the electron transport layer are formed by a deposition process. delete delete Board;
A thin film transistor provided on the substrate; And
Including an organic light emitting device in which light emission is controlled by the thin film transistor,
The organic light-emitting device is an organic light-emitting display device comprising the organic light-emitting device according to any one of claims 1 and 5 to 6.

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