KR101296314B1 - The Organic Light Emitting Device and Manufacturing Method thereof - Google Patents

Abstract

The present invention relates to an organic light emitting device, comprising: a substrate; First and second electrodes spaced apart from each other on the substrate; And a plurality of light emitting layers formed in a vertical direction between the first electrode and the second electrode, wherein at least two light emitting layers of the plurality of light emitting layers include a plurality of horizontal light emitting regions formed in a horizontal direction. Horizontal emission areas adjacent to each other are characterized in that they emit different colors. As a result, it is possible to suppress changes in color or luminance emitted from the plurality of light emitting layers in accordance with the change in the driving voltage.

Description

Organic Light Emitting Device and Manufacturing Method

The present invention relates to an organic light emitting device and a method for manufacturing the same, and more particularly, to an organic light emitting device and a method for manufacturing the same for improving the emission color and the luminance change caused by the change in the driving voltage.

Organic Light Emitting Device (OLED) has an exciton in which electrons injected from an electron injection electrode (cathode) and holes injected from a hole injection electrode (anode) are combined in an organic emission layer. It is a self-luminous device that forms an exciton and emits light while the exciton emits energy. Since the organic light emitting device does not need a separate light source, it is advantageous in terms of power consumption, and has an advantage in that response speed, viewing angle, and contrast ratio are very excellent.

Recently, with the development of white organic light emitting diodes, researches for applying them to TVs, displays, and lights have been actively conducted. Such a white organic light emitting device has a large gap from the prior art in terms of energy efficiency by depositing a plurality of organic light emitting layers between the lower electrode and the upper electrode to emit high luminance light with a low voltage driving method.

Although the white organic light emitting diode has a great advantage, there is a problem in that the emission color shifts according to the change of the driving voltage and thus the luminous efficiency changes. In order to solve this problem, researches for implementing various device structures have been conducted. This research is disclosed in the prior art, such as a white organic light emitting device (Korean Patent Publication No. 10-2010-0062169).

However, in the prior art, a plurality of light emitting layers are formed using phosphorescent and fluorescent materials, and the organic light emitting device has only a vertical structure in the direction of the hole transport layer (HTL) to the electron transport layer (ETL). The emission color, luminance, and the like change accordingly. The reason is that in the organic light emitting device having the plurality of light emitting layer structures, the light emission recombination zone shifts according to the driving voltage. As a result, the peak intensity of the light emitting layer is changed, and thus the light emission color or luminance is changed.

Therefore, the present invention is derived to solve the problems of the related art as described above, and the organic light emitting device that can suppress the change in the emission color or luminance caused by the change of the driving voltage, etc., thereby improving the luminous efficiency and The manufacturing method is provided.

Other features and advantages of the invention will be described below, and in part will be apparent from such techniques. Alternatively, other features and advantages of the invention may be learned through practice of the invention. The objects and other advantages of the invention will be realized and attained by the structure particularly pointed out in the accompanying drawings, the description of the invention and the claims.

In order to achieve the above advantages, and in accordance with the object of the present invention, a substrate; First and second electrodes spaced apart from each other on the substrate; And a plurality of light emitting layers formed in a vertical direction between the first electrode and the second electrode, wherein at least two light emitting layers of the plurality of light emitting layers include a plurality of horizontal light emitting regions formed in a horizontal direction. The horizontal light emitting areas adjacent to each other in the areas are provided with an organic light emitting device characterized in that they emit different colors.

The semiconductor device may further include a hole transport layer formed between the first electrode and the plurality of light emitting layers, and an electron transport layer formed between the second electrode and the plurality of light emitting layers.

The semiconductor device may further include a hole injection layer formed between the first electrode and the hole transport layer, and an electron injection layer formed between the second electrode and the electron transport layer.

And a buffer layer formed on at least one region between the first electrode and the second electrode.

The display device may further include a partition wall formed between the plurality of horizontal light emitting regions.

The plurality of horizontal light emitting regions may be formed in a grid shape.

The plurality of horizontal light emitting areas may be formed in the left and right directions.

The plurality of light emitting layers may include two layers, and the plurality of horizontal light emitting regions of each of the light emitting layers may be formed so that two or three kinds of colors alternately emit light.

The plurality of light emitting layers may include three layers, and the plurality of horizontal light emitting regions of each of the light emitting layers may be formed so that two or three kinds of colors alternately emit light.

The plurality of light emitting layers may emit white light.

In another aspect of the invention, forming a first electrode on a substrate; Forming a plurality of light emitting layers in the vertical direction on the first electrode, wherein at least two light emitting layers of the plurality of light emitting layers form a plurality of horizontal light emitting regions in a horizontal direction; And forming a second electrode on the plurality of light emitting layers, wherein in the forming of the plurality of horizontal light emitting regions, adjacent horizontal light emitting regions of the plurality of horizontal light emitting regions emit different colors. There is provided a method of manufacturing an organic light emitting device.

The method may further include forming a hole transport layer between the first electrode and the plurality of light emitting layers, and forming an electron transport layer between the second electrode and the plurality of light emitting layers.

The method may further include forming a hole injection layer between the first electrode and the hole transport layer, and forming an electron injection layer between the second electrode and the electron transport layer.

The method may further include forming a partition wall between the plurality of horizontal light emitting regions.

In the forming of the plurality of horizontal light emitting regions, the plurality of horizontal light emitting regions may be formed in a grid shape.

In the forming of the plurality of horizontal light emitting regions, the plurality of horizontal light emitting regions may be formed in the left and right directions.

In the forming of the plurality of horizontal light emitting regions, the plurality of horizontal light emitting regions of each light emitting layer may be formed so that two or three kinds of colors alternately emit light.

In the forming of the plurality of light emitting layers, the plurality of light emitting layers may emit white light.

It is to be understood that both the foregoing general description and the following detailed description are intended to illustrate or explain the invention, and to provide a more detailed description of the invention in the claims.

As described above, the organic light emitting device and the method of manufacturing the same have the following effects.

First, it is possible to suppress a change in color or luminance emitted from the plurality of light emitting layers according to the change in the driving voltage.

Second, luminous efficiency can be improved and lifespan can be improved by suppressing changes in color or luminance emitted.

The accompanying drawings are included to assist in understanding the present invention and to form a part of the specification, to illustrate embodiments of the present invention, and to describe the principles of the present invention together with the detailed description of the present invention.
1 is a vertical cross-sectional view of an organic light emitting diode according to a first embodiment of the present invention;
2 is a vertical cross-sectional view showing an embodiment further including a hole injection layer and an electron injection layer in the organic light emitting device of FIG.
3 is a vertical cross-sectional view showing an embodiment further including a buffer layer in the organic light emitting device of FIG.
4 is a horizontal cross-sectional view taken along line IV-IV of the organic light emitting diode of FIG. 1,
5 is a schematic view for explaining a compensation relationship of the light emitting layer of the organic light emitting device according to the first embodiment of the present invention;
6 is a horizontal cross-sectional view of an organic light emitting diode according to a second embodiment of the present disclosure;
7 is a horizontal cross-sectional view of an organic light emitting diode according to a third embodiment of the present invention;
8 is a vertical cross-sectional view of an organic light emitting diode according to a fourth embodiment of the present invention;
9 is a vertical cross-sectional view of an organic light emitting diode according to a fifth embodiment of the present invention;
10 is a vertical cross-sectional view of an organic light emitting diode according to a sixth embodiment of the present invention;
11 is a vertical cross-sectional view of an organic light emitting diode according to a seventh embodiment of the present invention.

It will be apparent to those skilled in the art that various changes and modifications of the present invention are possible without departing from the spirit and scope of the present invention. Accordingly, the invention includes all modifications and variations that fall within the scope of the invention as set forth in the claims and their equivalents.

Hereinafter, an organic light emitting diode and a method of manufacturing the same according to an exemplary embodiment will be described in detail with reference to the accompanying drawings.

≪ Embodiment 1 >

1 is a vertical cross-sectional view of an organic light emitting device according to a first embodiment of the present invention, Figure 2 is a vertical cross-sectional view showing an embodiment further comprising a hole injection layer and an electron injection layer in the organic light emitting device of FIG. 2 is a vertical cross-sectional view showing an embodiment further including a buffer layer in the organic light emitting device of FIG. 2, FIG. 4 is a horizontal cross-sectional view according to IV-IV of the organic light emitting device of FIG. 1, and FIG. 5 is a cross-sectional view of the first embodiment of the present invention. It is a schematic diagram for explaining the compensating relationship of the light emitting layer of the organic light emitting device.

As shown in FIG. 1, the organic light emitting diode 1 according to the present invention includes a substrate 10, a first electrode 20 and a second electrode 80 spaced apart from each other on the substrate 10, and A plurality of light emitting layers (EML) 50 formed in the vertical direction between the first electrode 20 and the second electrode 80 is included.

The substrate 10 is formed of a transparent glass material or a plastic material as an example of the present invention, and the first electrode 20 is formed thereon. However, the substrate 10 is not limited thereto, and may be formed of an opaque material when light may be emitted to the second electrode 80.

As an example of the present invention, the first electrode 20 is coated with indium tin oxide (ITO) having a high transmittance on the substrate 10 and used as an anode. Accordingly, the first electrode 20 may serve to inject holes and transmit light emitted from the first electrode 20. However, the first electrode 20 is not limited thereto, and may form ZnO, ZnO: B, ZnO: Al, ZnO: H, SnO ₂ , SnO ₂ : F, IndiumZincOxide (IZO), and indium oxide (Indium), which may form a transparent electrode. Oxide, tin oxide, or graphene may be provided with various materials.

The second electrode 80 is formed of aluminum (Al) or the like as an example of the present invention and used as a cathode. However, the second electrode 80 is not limited thereto and may be formed of a material having a high transmittance like the first electrode 20.

In one embodiment of the present invention, a hole transport layer (HTL) 40 may be formed between the first electrode 20 and the light emitting layer 50. The hole transport layer 40 is formed on the first electrode 20 and serves to transfer holes injected from the first electrode 20 to the plurality of light emitting layers 50. The hole transport layer 40 may be formed to include the hole transport material, or may have a structure in which the hole transport material is stacked. Thus, the hole transport efficiency to the light emitting layer 50 can be improved by the hole transport layer 40.

In one embodiment of the present invention, an electron transport layer (ETL) 60 may be formed between the second electrode 80 and the light emitting layer 50. The electron transport layer 60 is formed on the plurality of light emitting layers 50 and serves to transfer electrons injected from the second electrode 80 to the plurality of light emitting layers 50. The electron transport layer 60 may be formed to include an electron transport material or may have a structure in which the electron transport material is stacked. Accordingly, the electron transport efficiency to the plurality of light emitting layers 50 can be improved by the electron transport layer 60.

As shown in FIG. 2, the organic light emitting diode 1 according to the first embodiment of the present invention has a hole injection layer (HIL) 30 between the first electrode 20 and the hole transport layer 40. ) May be formed. The hole injection layer 30 is formed on the first electrode 20 and serves to transfer holes injected from the first electrode 20 to the hole transport layer 40. Accordingly, the hole injection efficiency into the hole transport layer 40 can be improved by the hole injection layer 30. However, the hole injection layer 30 may be omitted.

In addition, as shown in FIG. 2, the organic light emitting diode 1 according to the first exemplary embodiment of the present invention has an electron injection layer (EIL) between the second electrode 80 and the electron transport layer 60. 70 can be formed. The electron injection layer 70 is formed on the electron transport layer 60 and serves to transfer electrons injected from the second electrode 80 to the electron transport layer 60. Accordingly, the electron injection efficiency to the electron transport layer 60 can be improved by the electron injection layer 70. However, this electron injection layer 70 may also be omitted.

As shown in FIG. 3, the organic light emitting diode 1 according to the first exemplary embodiment may further include a buffer layer 90 formed in at least one region between the first electrode 20 and the second electrode 80. It may include. The buffer layer 90 is formed between the hole transport layer 40 and the light emitting layer 50 and between the electron transport layer 60 and the light emitting layer 50 as an example of the present invention. However, the buffer layer 90 is not limited thereto, and may be variously disposed between the light emitting layers 50, between the first electrode 20 and the hole injection layer 30, and between the second electrode 80 and the electron injection layer 70. Where it can be formed. The buffer layer 90 may function to block or accelerate the transfer of holes or electrons depending on the position at which the buffer layer 90 is formed.

With this configuration, in the organic light emitting device 1 according to the present invention, when a driving voltage is applied to the first electrode 20 and the second electrode 80, holes are injected from the first electrode 20 and the second electrode ( The electron is injected from the 80 to combine the holes and electrons in the light emitting layer 50 to emit light.

A plurality of light emitting layer 50 is formed by laminating in the vertical direction on the hole transport layer 40 as an example of the present invention. In the present invention, a direction from the first electrode 20 to the second electrode 80 is defined as a vertical direction in FIG. 1, and a horizontal direction of the vertical direction is defined as a horizontal direction. The plurality of light emitting layers 50 may include phosphors or fluorescent materials, and may include both phosphors and fluorescent materials. In addition, the plurality of light emitting layers 50 may include low molecular weight or high molecular materials, and may include both low molecular weight and high molecular materials.

At least two light emitting layers 50 of the light emitting layers 50 include a plurality of horizontal light emitting regions 51a, 51b, 52a, and 52b formed in a horizontal direction, and a plurality of horizontal light emitting regions 51a, 51b, 52a, and 52b. The horizontal light emitting areas adjacent to each other in the horizontal direction emit light of different colors. When the light emitting layers 50 forming the plurality of horizontal light emitting regions 51a, 51b, 52a, and 52b are stacked on each other, horizontal light emission adjacent to each other in the vertical direction among the plurality of horizontal light emitting regions 51a, 51b, 52a, and 52b. The area also emits different colors.

As shown in FIG. 1 and FIG. 4, in one embodiment of the present invention, the plurality of light emitting layers 50 is composed of two layers formed of the first light emitting layer 51 and the second light emitting layer 52. Two horizontal light emitting regions 51a and 51b are formed in the first light emitting layer 50, and two horizontal light emitting regions 52a and 52b are formed in the second light emitting layer 50. Two kinds of colors (region A and region B) are alternately emitted in the horizontal emission regions 51a, 51b, 52a, and 52b. Further, different colors emit light in the horizontal light emitting areas adjacent to the horizontal light emitting areas 51a, 51b, 52a, and 52b in the horizontal and vertical directions. That is, the first emission layer 51 and the second emission layer 52 are vertically formed on one first electrode 20 forming the unit pixel, and each of the first emission layer 51 and the second emission layer 52 is formed. Horizontal light emitting regions 51a, 51b and 52a, 52b are formed in the horizontal direction. As one example of the present invention, these two types of light emitting colors may be combined to form white light. Such a color may for example be blue and yellow. However, the horizontal light emitting area formed in each of the first light emitting layer 51 and the second light emitting layer 52 may be formed so that three kinds of light emitting colors alternately emit light. In addition, three or more horizontal emission regions formed in each of the first emission layer 51 and the second emission layer 52 may be formed, and two or three kinds of emission colors may be alternately emitted in the horizontal emission region. Of course. Even when three kinds of emission colors are alternately formed, it is preferable that the three kinds of emission colors are combined to form white light. Such a color can be, for example, Red, Green and Blue.

5 is a schematic diagram illustrating a compensation relationship of a light emitting layer according to a driving voltage in an organic light emitting diode according to a first exemplary embodiment of the present invention. As shown in the figure, the light emission recombination zone is changed in the direction of the arrow A according to the driving voltage supplied to each electrode 20,80. That is, the light emission recombination zone moves entirely between the first light emitting layer 51 and the second light emitting layer 52 according to the driving voltage regardless of the horizontal light emitting region. For example, when the driving voltage is increased and the light emitting recombination region moves in the direction of the electron transport layer (ETL) 60, the second light emitting layer (EML) 52 close to the electron transport layer (ETL) 60 becomes the first light emitting layer ( EML) 51 will emit more light. That is, in FIG. 5, light emitted from the A area 52a of the second light emitting layer and the B area 52b of the second light emitting layer is emitted from the A area 51a of the first light emitting layer and the B area 51b of the first light emitting layer. It will emit more than the light it emits. However, the more the A region 52a of the second light emitting layer diverges, the smaller the A region 51a of the first light emitting layer diverges, and the more the B region 52b of the second light emitting layer diverges more, the first. The B region 51b of the light emitting layer emits smaller. Therefore, even if the driving voltage changes, the color or brightness of light emitted from the entire area A 51a and 52a and the color or brightness of light emitted from the entire area B 51b and 52b are almost unchanged. Accordingly, by forming the light emitting layer structure having the plurality of horizontal light emitting regions, even when the driving voltage is changed, it is possible to compensate so that the color or luminance of the light finally emitted hardly changes.

In addition, for example, when the driving voltage decreases and the light emitting recombination region moves in the direction of the hole transport layer (HTL) 40, the same method as described above can be described and the same result can be obtained.

Accordingly, the organic light emitting device 1 according to the present invention can suppress the change in color or luminance according to the driving voltage. In addition, in the case of realizing white light, by suppressing such a change in color or luminance, it is not necessary to supply an additional compensation voltage to reinforce a light emitting area in response to a change in driving voltage, thereby improving luminous efficiency. The lifespan can be reduced by using the additional compensation voltage, thereby improving the lifespan.

With this configuration, the manufacturing process of the organic light emitting device 1 according to the present invention will be described as follows.

First, the first electrode 20, the hole transport layer 40, the light emitting layer 50, the electron transport layer 60, and the second electrode 80 are sequentially stacked on the substrate 10 in the vertical direction. . The forming of the plurality of light emitting layers 50 may include the region A of the first light emitting layer 51 illustrated in FIG. 1 using a shadow mask (not shown) in a thermal evaporation process as an example of the present invention. The first region 51b and the second region 52b of the second emission layer 52 are sequentially deposited, and then, again using a shadow mask (not shown), the region B and the second emission layer 51b of the first emission layer 51 ( What is necessary is to deposit the A area | region 52a of 52 sequentially. However, the step of forming the plurality of light emitting layers 50 is not limited to this method, and the spin coating process, dip coating process, doctor blading (Doctor) depending on the material for forming the light emitting layer 50, etc. It may be formed by various methods such as a blading process, an inkjet printing process, or a thermal transfer process.

Other methods of forming the first electrode 20, the hole transport layer 40, the electron transport layer 60, the second electrode 80, etc. may also be thermal evaporation process or spin coating depending on the material. It may be formed by various methods such as a coating process, a dip coating process, a doctor blading process, an inkjet printing process, or a thermal transfer process.

≪ Embodiment 2 >

6 is a horizontal cross-sectional view of an organic light emitting diode according to a second exemplary embodiment of the present invention. As shown in the figure, in the light emitting layers 150a, 150b and 150c of the organic light emitting diode according to the second embodiment of the present invention, the horizontal light emitting regions 151a and 151b form a grid shape in a horizontal direction. The difference with the embodiment. Although not shown, the same lattice-like horizontal light emitting area is formed in the vertical direction as in the first embodiment.

More specifically, FIG. 6A illustrates a grid shape of four horizontal light emitting regions 151a and 151b in which a light emitting layer 150a formed on one first electrode 20 forming a unit pixel is separated in a horizontal direction. The example formed by this is shown. As an example of the present invention, two types of colors (region A and region B) alternately emit light in four horizontal emission regions 151a and 151b. However, three kinds of colors can be formed to alternately emit light. In addition, it is preferable that two or three kinds of light-emitting colors are combined to form white light.

FIG. 6B illustrates an example in which the light emitting layer 150b formed on the first electrode 20 is formed in a lattice shape with six horizontal light emitting regions separated in the horizontal direction. An example in which the light emitting layer 150c formed on the first electrode 20 is formed in a lattice shape with nine horizontal light emitting regions separated in the horizontal direction is illustrated. In addition, such a horizontal light emitting area formed in the light emitting layer is not limited to this, of course, can be applied to a variety of shapes and numbers of grid shapes. As described above, even when the horizontal light emitting area has a lattice shape, the compensation relationship with respect to the change in color and luminance according to the change in driving voltage can be described in the same manner as in the first embodiment.

Accordingly, the organic light emitting diode according to the second exemplary embodiment of the present invention can suppress the change in color or luminance according to the driving voltage. In addition, by suppressing such a change in color and luminance, the luminous efficiency can be improved and the lifetime can be improved.

≪ Third Embodiment >

7 is a horizontal cross-sectional view of an organic light emitting diode according to a third embodiment of the present invention. As shown in the figure, in the light emitting layers 250a, 250b and 250c of the organic light emitting diode according to the third embodiment of the present invention, the horizontal light emitting regions 251a and 251b are formed in the left and right directions. Is the difference. Although not shown, horizontal light emitting regions 251a and 251b in the same left and right directions are formed in the vertical direction similarly to the first embodiment.

More specifically, FIG. 7A illustrates an example in which the light emitting layer 250a formed on one first electrode 20 forming a unit pixel forms three horizontal light emitting regions 251a and 251b in left and right directions. It is shown. FIG. 7B illustrates an example in which the light emitting layer 250b formed on the first electrode 20 forms four horizontal light emitting regions in the left and right directions, and FIG. 7C illustrates the first electrode 20. An example in which the light emitting layer 250c formed on the upper side is formed in five horizontal light emitting regions in the left and right directions is illustrated. In addition, the horizontal emission area formed in the emission layer is not limited thereto, and may be formed in six or more in the left and right directions.

In addition, the organic light emitting device according to the third embodiment of the present invention is formed so that two kinds of colors (A region and B region) alternately emit light as in the above-described second embodiment, but the three kinds of colors alternately emit light. Of course, it is preferable that the light emission color is coalesced and formed as white light. As described above, even when the horizontal light emitting area is formed in the left and right directions, the compensation relationship with respect to the change in color and luminance according to the change in driving voltage can be described in the same manner as in the first embodiment.

Accordingly, the organic light emitting diode according to the third exemplary embodiment of the present invention can also suppress the change in color or luminance according to the driving voltage. In addition, by suppressing such a change in color and luminance, the luminous efficiency can be improved and the lifetime can be improved.

<Fourth Embodiment>

8 is a vertical cross-sectional view of an organic light emitting diode according to a fourth embodiment of the present invention. As shown in this figure, the light emitting layers 350a, 350b and 350c of the organic light emitting diode according to the fourth embodiment of the present invention are different from the first embodiment in that they are formed of three layers in the vertical direction.

More specifically, in FIG. 8A, the light emitting layer 350a formed on one first electrode 20 forming a unit pixel forms two horizontal light emitting regions 351a and 351b in left and right directions. An example in which the colors (areas A and B) are formed to alternately emit light in the vertical and horizontal directions is shown. 8B shows that the light emitting layer 350b formed on the first electrode 20 forms two horizontal light emitting regions in the left and right directions, and three kinds of colors (region A, region B, region c) correspond to the vertical direction and An example is formed to alternately emit light in the horizontal direction. In FIG. 8C, the light emitting layer 350c formed on the first electrode 20 forms three horizontal light emitting regions 351a, 351b, and 351c in left and right directions, and has three kinds of colors (region A and region B). (C region) shows an example in which light is alternately emitted in the vertical direction and the horizontal direction. In addition, the present invention is not limited thereto, and the light emitting layer formed on the first electrode 20 may form four or more horizontal light emitting regions in the left and right directions, and may be formed to alternately emit two or three kinds of colors. As described above, even when the light emitting layer in which the horizontal light emitting area is formed is formed of three layers in the vertical direction, the compensation relation for the change in color and luminance due to the change in driving voltage can be described in the same manner as in the first embodiment.

By such a configuration, even in the case of the organic light emitting device according to the fourth embodiment of the present invention, it is possible to suppress a change in color or luminance depending on the driving voltage. In addition, by suppressing such a change in color and luminance, the luminous efficiency can be improved and the lifetime can be improved.

<Fifth Embodiment>

9 is a vertical cross-sectional view of an organic light emitting diode according to a fifth embodiment of the present invention. As shown in this figure, the light emitting layers 450a, 450b, and 450c of the organic light emitting diode according to the fifth embodiment of the present invention are different from the first embodiment in that they are formed of four layers in the vertical direction.

More specifically, in FIG. 9A, the light emitting layer 450a formed on one first electrode 20 forming a unit pixel forms two horizontal light emitting regions 451a and 451b in left and right directions. An example in which the colors (areas A and B) are formed to alternately emit light in the vertical and horizontal directions is shown. In FIG. 9B, the light emitting layer 450b formed on the first electrode 20 forms two horizontal light emitting regions in the left and right directions, and three kinds of colors (A region, B region, and c region) are vertical and An example is formed to alternately emit light in the horizontal direction. In FIG. 9C, the light emitting layer 450c formed on the first electrode 20 forms three horizontal light emitting regions 451a, 451b, and 451c in the left and right directions. (C region) shows an example in which light is alternately emitted in the vertical direction and the horizontal direction. In addition, the light emitting layer is not limited thereto, and four or more horizontal light emitting regions may be formed in the left and right directions, and two or three kinds of colors may alternately emit light. In addition, the light emitting layer may be formed of five or more layers in the vertical direction, and in this case, the fourth or fifth embodiment may be applied. As described above, even when the light emitting layer in which the horizontal light emitting area is formed is formed of four layers or five or more layers in the vertical direction, the compensation relation for the change in color and luminance according to the change of the driving voltage will be described in the same manner as in the first embodiment. Can be.

With such a configuration, even in the case of the organic light emitting device according to the fifth embodiment of the present invention, it is possible to suppress the change in color or luminance according to the driving voltage. In addition, by suppressing such a change in color and luminance, the luminous efficiency can be improved and the lifetime can be improved.

<Sixth Embodiment>

10 is a vertical cross-sectional view of an organic light emitting diode according to a sixth embodiment of the present invention. As shown in this figure, a part of the light emitting layers 550a and 550b of the organic light emitting diode according to the sixth embodiment of the present invention is different from the first embodiment in that it does not form a horizontal light emitting area.

More specifically, FIG. 10A illustrates three emission layers 550a formed on one first electrode 20 forming unit pixels, two of which are horizontal emission areas 551a, 551b), but the remaining horizontal light emitting area is not formed. In this case, the A region 553a, which does not form the horizontal light emitting region, may arrange a material having a low luminous efficiency to match a color finally required. For example, by arranging a blue light emitting material having a low luminous efficiency in the A region 553a, white light can be easily emitted finally.

In FIG. 10B, the light emitting layer 550b is formed of four layers on one first electrode 20 forming a unit pixel, and two layers form horizontal light emitting regions 551a and 551b. However, the rest do not form a horizontal emission area. Even in this case, the two light emitting layers 551a and 551b forming the horizontal light emitting area can function to suppress a change in color or luminance due to a change in driving voltage as in the first embodiment. As described above, even when the light emitting layer which does not form the horizontal light emitting area is included among the plurality of light emitting layers, the light emitting layers forming the horizontal light emitting area are used to change the color and the luminance according to the change of the driving voltage in the same manner as in the first embodiment. Explain the compensatory relationship.

Accordingly, in the case of the organic light emitting diode according to the sixth exemplary embodiment of the present invention, a change in color or luminance according to the driving voltage can also be suppressed. In addition, by suppressing such a change in color and luminance, the luminous efficiency can be improved and the lifetime can be improved.

Seventh Embodiment

11 is a vertical cross-sectional view of an organic light emitting diode according to a seventh embodiment of the present invention. As shown in the figure, in the light emitting layer 650 of the organic light emitting diode according to the seventh embodiment of the present invention, the partition wall 95 is formed between the plurality of horizontal light emitting regions 651a and 651b. This is the difference from.

The partition wall 95 is formed on the hole transport layer 40 as an example of the present invention to separate the plurality of horizontal light emitting regions 651a and 651b. However, when the horizontal light emitting area is formed on another light emitting layer 553a as in the sixth embodiment, the separation wall 95 may be formed on the light emitting layer 553a.

The dividing wall 95 is preferably formed of a material having an insulating property, and may be formed of various materials such as low molecular weight or polymer. Alternatively, the separation wall 95 may be a thermal evaporation process, a spin coating process, a dip coating process, a doctor blading process, an inkjet printing process, or It may be formed by various methods such as a thermal transfer process.

Therefore, the organic light emitting diode according to the seventh exemplary embodiment of the present invention can make the horizontal light emitting area easier by forming a separation wall before forming the horizontal light emitting area.

1: Organic Light-Emitting Element 10: Substrate
20: first electrode 30: hole injection layer (HIL)
40: hole transport layer (HTL) 50: light emitting layer (EML)
60: electron transport layer (ETL) 70: electron injection layer (EIL)
80: second electrode (Cathode)

Claims (18)

Claims [1]
First and second electrodes spaced apart from each other on the substrate; And
It includes a plurality of light emitting layer formed in the vertical direction between the first electrode and the second electrode,
The plurality of light emitting layers includes a plurality of horizontal light emitting regions formed in a horizontal direction.
Horizontal light emitting areas adjacent to each other in the horizontal direction among the plurality of horizontal light emitting areas emit different colors,
An organic light emitting device according to claim 1, wherein the horizontal light emitting areas adjacent to each other in the vertical direction among the plurality of horizontal light emitting areas emit different colors. The method of claim 1,
A hole transport layer formed between the first electrode and the light emitting layers; And
And an electron transporting layer formed between the second electrode and the plurality of light emitting layers. 3. The method of claim 2,
A hole injection layer formed between the first electrode and the hole transport layer; And
And an electron injection layer formed between the second electrode and the electron transport layer. The method according to any one of claims 1 to 3,
And a buffer layer formed on at least one region between the first electrode and the second electrode. The method of claim 1,
The organic light emitting device of claim 1, further comprising a partition wall formed between the plurality of horizontal light emitting regions. The method of claim 1,
The plurality of horizontal light emitting area is an organic light emitting device, characterized in that formed in a grid. The method of claim 1,
The plurality of horizontal light emitting area is an organic light emitting device, characterized in that formed in the left and right directions. The method of claim 1,
The plurality of light emitting layers are composed of two layers, and the plurality of horizontal light emitting regions of each of the light emitting layers are formed so that two or three kinds of colors alternately emit light. The method of claim 1,
The plurality of light emitting layers are composed of three layers, and the plurality of horizontal light emitting regions of each of the light emitting layers are formed so that two or three kinds of colors alternately emit light. 10. The method of claim 1, 8 or 9,
And the plurality of light emitting layers emit white light. Forming a first electrode on the substrate;
Forming a plurality of light emitting layers in a vertical direction on the first electrode, and the plurality of light emitting layers forming a plurality of horizontal light emitting regions in a horizontal direction; And
Forming a second electrode on the light emitting layer;
In the forming of the plurality of horizontal light emitting areas, horizontal light emitting areas adjacent to each other in a horizontal direction among the plurality of horizontal light emitting areas are formed to emit different colors.
An organic light emitting device according to claim 1, wherein the horizontal light emitting areas adjacent to each other in the vertical direction among the plurality of horizontal light emitting areas are formed to emit different colors. The method of claim 11,
Forming a hole transport layer between the first electrode and the plurality of light emitting layers; And
And forming an electron transport layer between the second electrode and the plurality of light emitting layers. 13. The method of claim 12,
Forming a hole injection layer between the first electrode and the hole transport layer; And
The method of manufacturing an organic light emitting device further comprising the step of forming an electron injection layer between the second electrode and the electron transport layer. The method of claim 11,
And forming a partition wall between the plurality of horizontal light emitting regions. The method of claim 11,
The method of manufacturing an organic light emitting device according to claim 1, wherein the plurality of horizontal light emitting regions is formed in a lattice shape. The method of claim 11,
In the forming of the plurality of horizontal light emitting area, the plurality of horizontal light emitting area is a manufacturing method of an organic light emitting device, characterized in that formed in the left and right directions. The method of claim 11,
And in the forming of the plurality of horizontal light emitting regions, the plurality of horizontal light emitting regions of each light emitting layer are formed so that two or three kinds of colors alternately emit light. The method according to claim 11 or 17,
In the forming of the plurality of light emitting layer, the plurality of light emitting layer is a method of manufacturing an organic light emitting device, characterized in that for emitting white light.

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