KR101982261B1 - Organic Light emitting device - Google Patents

Abstract

The organic light-emitting device according to the present invention is a light-transmitting substrate having a plurality of grooves arranged in one direction and spaced apart from each other, a plurality of grooves arranged in the array direction of the plurality of grooves and spaced apart from each other A first electrode having a conductive portion, a peripheral wall of the plurality of grooves and a first electrode formed on the substrate, the organic material layer generating light, and the second electrode formed on the organic material layer.
Therefore, according to the embodiment of the present invention, at least a part of the light generated in the organic layer is reflected at least once inside the groove of the second electrode, thereby reducing the amount of light extracted to the side of the organic light emitting device, It is possible to increase the amount of light extracted in the downward direction.

Description

[0001] The present invention relates to an organic light emitting device,

The present invention relates to an organic light emitting device, and more particularly, to an organic light emitting device capable of improving light extraction efficiency.

An organic light emitting device (OLED), one of display devices, has a structure in which an organic layer including a light emitting layer made of an organic light emitting material is formed between a pair of electrodes, at least one of which is transparent or translucent. That is, the organic light emitting element includes a substrate having a light transmitting property, an anode which is formed on the substrate and is transparent to light, an organic material layer formed on the anode and generating light, and a cathode formed on the organic material layer and having a property of reflecting light . In the organic light emitting device, when a voltage is applied between a pair of electrodes, electrons are injected from the cathode into the organic material layer, holes are injected from the anode, and these recombine in the organic material layer. Then, the organic light emitting material is excited by the energy generated at this time, and the organic layer is emitted.

On the other hand, there is a problem that a part of the light generated in the organic material layer can not be extracted on the front surface (downward direction of the substrate) of the substrate, and is extracted and lost in the lateral direction of the substrate. In this way, the amount of light emitted to the front surface of the substrate decreases due to the amount of light extracted or emitted in the lateral direction of the substrate, which causes degradation of the efficiency of the apparatus.

In order to solve this problem, a microlens array is formed outside the organic light emitting device, or nanoparticles are introduced between the anode and the substrate to increase the amount of light emitted to the entire surface of the substrate. However, this method causes distortion of the electroluminescence spectrum (EL spectrum), and the manufacturing process is complicated.

Korean Published Patent Application No. 2006-0030718

The present invention provides an organic light emitting device capable of improving light extraction efficiency.

The present invention provides an organic light emitting device capable of reducing an amount of light extracted in a lateral direction of a substrate and increasing an amount of light extracted in a downward direction of the substrate.

An organic light-emitting device according to the present invention is a light-transmitting substrate having a plurality of grooves arranged in one direction and spaced apart from each other; A first electrode having a plurality of conductive portions spaced apart from each other so as to be alternately arranged with the grooves, the first electrodes being arranged in the array direction of the plurality of grooves on the substrate; An organic material layer formed on peripheral walls of the plurality of grooves and the first electrode of the substrate to generate light; And a second electrode formed on the organic material layer.

The first electrode is transparent and the second electrode has a property of reflecting light.

Wherein the upper surface of the substrate has a plurality of first surfaces spaced from one another and spaced apart in one direction, the conductive portions being formed on the upper surface; A plurality of second surfaces spaced apart from each other such that the second surfaces are alternately disposed with respect to the first surface; And a third surface extending from the second surface to the first surface, wherein the organic layer is formed on the conductive portion, on the second and third surfaces of the substrate.

Wherein the organic layer comprises: a first organic region formed on the conductive portion; A second organic region formed on a second surface of the substrate; And a third organic region formed on a third surface of the substrate, wherein the second electrode is formed on the first to third organic regions, and is arranged in an array direction of a plurality of grooves provided in the substrate , And a shape having a plurality of spaced apart grooves.

A method of fabricating an organic light emitting device according to the present invention includes the steps of: providing a light transmitting substrate; Forming a light-transmitting conductive layer on the substrate; Etching a plurality of partial regions of the conductive layer to form a plurality of conductive portions spaced apart from each other in one direction to form a first electrode; Forming a plurality of grooves in the substrate such that the substrate regions corresponding to the two conductive portions are successively etched so as to be aligned in the array direction of the plurality of conductive portions and alternately positioned with the conductive portions; Forming an organic material layer on a peripheral wall of the plurality of grooves and the first electrode of the substrate; And forming a second electrode on the organic layer.

In forming the second electrode, a material having a reflection characteristic is formed.

Wherein a plurality of grooves are formed on the substrate so as to be alternately positioned with the conductive portions, the upper surface of the substrate is a surface on which the conductive portions are formed, a plurality of first surfaces spaced from each other by being arranged in one direction, A plurality of second surfaces spaced apart from each other so as to be alternately disposed with respect to the first surface and a third surface extending from the second surface to the first surface, A conductive portion top, and second and third surfaces of the substrate.

Wherein an organic layer is formed on the first electrode, the organic layer includes a first organic region formed on the conductive portion, a second organic region formed on the second surface of the substrate, and a second organic region formed on the third surface of the substrate And the second electrode is formed on the first to third organic regions and is arranged in the array direction of the plurality of grooves provided in the substrate and includes a plurality of mutually spaced apart grooves Respectively.

According to the embodiment of the present invention, the first electrode is provided so as to have a plurality of conductive portions arranged in one direction and spaced apart from each other, and a groove is provided in the substrate region between the plurality of conductive portions. Accordingly, the second electrode formed on the first electrode is also formed in a structure in which a plurality of grooves are arranged in one direction and spaced apart. Therefore, at least a part of the light generated in the organic layer is reflected at least once by the surface defining the groove of the second electrode, so that the amount of light extracted to the side of the organic light emitting device can be reduced compared to the conventional one, The amount of light extracted in the downward direction can be increased.

1 is a cross-sectional view illustrating an organic light emitting device having a substrate and a first electrode according to an embodiment of the present invention
2 is a cross-sectional view illustrating a substrate and a first electrode according to an embodiment of the present invention;
3 is a top view of the first electrode according to the embodiment of the present invention,
FIG. 4 is a cross-sectional view schematically showing the path of light generated in the organic layer in the organic light emitting device having the first electrode according to the embodiment of the present invention.
5 is a cross-sectional view illustrating an organic light emitting device having a substrate and a first electrode according to a comparative example
6 is a top view of a plurality of first electrodes according to a comparative example,
7 is a graph showing the luminance according to the current density of the organic light emitting device according to the example of the present invention and the comparative example
8 shows the current efficiency according to the current density of the organic light emitting device according to the embodiment of the present invention and the comparative example,
FIG. 9 is a photograph of a light emission state of an organic light emitting device according to an embodiment of the present invention. FIG. 9 is a photograph
FIG. 10 is a photograph of the light emitting state of the organic light emitting device according to the comparative example. FIG. 9 is a photograph showing the light emitting state of the organic light emitting device according to the comparative example.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of other various forms of implementation, and that these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know completely.

The present invention relates to an organic light emitting device capable of improving light extraction efficiency. More specifically, the present invention provides an organic light emitting device capable of improving an electrode positioned in a direction in which light is extracted, thereby increasing the amount of light extracted or extracted to the outside.

Hereinafter, an organic light emitting device according to embodiments of the present invention will be described with reference to the drawings.

1 is a cross-sectional view illustrating an organic light emitting device having a substrate and a first electrode according to an embodiment of the present invention. 2 is a cross-sectional view illustrating a substrate and a first electrode according to an embodiment of the present invention. 3 is a top view of the first electrode according to the embodiment of the present invention viewed from above. 4 is a view conceptually showing a path of light generated in an organic material layer in an organic light emitting device having a first electrode according to an embodiment of the present invention. 5 is a cross-sectional view illustrating an organic light emitting device having a substrate and a first electrode according to a comparative example. 6 is a top view of a plurality of first electrodes according to a comparative example viewed from above. 7 is a graph showing luminance according to current density of an organic light emitting device according to an embodiment of the present invention and a comparative example. 8 is a graph showing the current efficiency according to the current density of the organic light emitting device according to the embodiment of the present invention and the comparative example. 9 is a photograph of a light emission state of an organic light emitting device according to an embodiment of the present invention. 10 is a photograph of a light emitting state of an organic light emitting device according to a comparative example.

1 to 3, an organic light emitting device according to an embodiment of the present invention includes a substrate 100 having a plurality of grooves 100g that are optically transparent and arranged in one direction and are spaced apart from each other, a substrate 100, A first electrode 200 formed on the first electrode 200 and having a plurality of conductive portions 210 spaced apart from each other in a single direction, an organic layer 300 formed on the first electrode 200 to generate light, And a second electrode 400 formed on the second electrode 300.

The substrate 100 may be a material having light-transmitting properties, for example, glass, so that light generated in the organic layer 300 may be emitted to the outside. The substrate 100 according to the embodiment is formed so that its upper surface (upper surface) has a height step. Referring to FIG. 2, the upper surface of the substrate 100 includes a first surface 110 having a first height, and a second surface 120 having a lower height than the first surface 110. Thus, the upper surface of the substrate 100 is a shape having a step difference by a height difference between the first surface 110 and the second surface 120. The first surface 110 and the second surface 120 are formed in a plurality of shapes such that the first surface 110 and the second surface 120 are spaced apart from the first electrode 200 or the extending direction of the substrate 100 Are alternately formed a plurality of times. A surface connecting the first surface 110 and the second surface 120 is a lateral surface intersecting or orthogonal to the first and second surfaces 110 and 120 and is hereinafter referred to as a third surface 130).

The upper surface of the substrate 100 according to the embodiment includes the first surface 110 having a relatively high height and the second surface 120 having a lower height than the first surface 110, Lt; / RTI > The second surface 120 is a surface located in the inner direction of the substrate 100 as compared with the first surface 110. The upper surface of the second surface 120 is a void space and the upper surface is open . The third surface 130 is a lateral surface extending upward from the second surface 120 with a surface extending in a direction intersecting or orthogonal to the second surface 120 as described above. Thus, the space partitioned by the second surface 120 and the third surface 130 has a groove shape with the upper side opened. Accordingly, the substrate 100 according to the embodiment may have a shape in which the first surface 110 and the groove 100g are alternately provided in one direction. The step or groove 100g may be formed on the upper surface of the substrate 100 by etching the upper surface of the substrate at the time of forming the first electrode 200 described later.

The upper surface of the substrate 100 according to the embodiment includes a first surface 110 having a relatively high height and a second surface 120 having a height lower than the first surface 110, 120, the surface area is larger than that of the conventional upper surface of the substrate.

The formation of the substrate 100 so as to have a step on the grooves 100g or the upper surface of the substrate 100 may be performed in the direction of the lower side of the substrate positioned below the organic material layer 300 out of the light generated in the organic material layer 300, To increase the amount of emitted light. That is, at least a part of the light generated from the organic material layer 300 is reflected by the second electrode 400 formed on the surface defining the groove 100g, so that the amount of light emitted in the lateral direction of the organic light- And to increase the amount of light emitted to the outside through the substrate 100. FIG.

The first electrode 200 serves as an anode for providing a hole to the organic material layer 300 and is formed of a transparent or translucent conductive material so that the light generated from the organic material layer 300 can be emitted to the outside. can do. The first electrode 200 according to the embodiment includes a conductive portion 210 formed on each of the plurality of first surfaces 110 of the substrate 100 as shown in FIG. The area between the conductive parts 210 is the second surface of the substrate 100. Since the second surface 120 of the substrate 100 is non-conductive, the first electrode 200 includes a plurality of conductive parts 210 and a plurality of non-conductive parts in a side view of the first electrode 200, The conductive part 210 and the non-conductive part may be alternately arranged. The conductive part 210 is formed on the first surface 110 of the substrate 100 and the nonconductive part is the second surface of the substrate 100 so that the conductive part 210 and the non- It has a step. As described above, the third surface 130 of the upper surface of the substrate 100 is a surface extending upward from the second surface 120, and the first surface 110 is the upper surface of the third surface 130 The conductive portion 210 of the first electrode 200 is positioned above the third surface 130. In this case, The third surface 130 of the upper surface of the substrate 100 and the side surfaces of the conductive portion 210 are arranged in this order from the second surface 120 upward.

The conductive portion 210 of the first electrode 200 may be formed of ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), AZO (ZnO: Al), GZO (ZnO: Ga), BZO SnO2 (SnO2: F).

The first electrode 200 may be formed of indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (AZO), or zinc oxide (GZO) on the upper surface of the substrate 100, , BZO (ZnO: B) and SnO2 (SnO2: F) is deposited by a method such as sputtering, and then a plurality of partial regions are etched to remove the conductive layer, The first electrode 200 including a plurality of spaced-apart non-conductive portions is formed. 3, the non-conductive parts may be arranged in the x-axis direction and the y-axis direction so as to be spaced apart from each other, and the area between the non-conductive parts arranged in series is the conductive part 210. [ The non-conductive portion of the first electrode 200 is the groove 100g of the substrate 100 because the first electrode 200, that is, the conductive portion 210 is formed on the substrate.

FIG. 3 shows a state where a plurality of first electrodes 200 are formed on one substrate 100. FIG. That is, one region including a plurality of conductive portions arranged in the y-axis direction in FIG. 3 is one first electrode (dotted line A) 200 in FIG. A plurality of such first electrodes 200 are arranged and arranged in the x-axis direction. Of course, one region including a plurality of conductive portions arranged in the x-axis direction may be defined as one first electrode 200. A plurality of such first electrodes 200 may be arranged and arranged in the y- .

A plurality of organic light emitting devices as shown in FIG. 1 are provided by forming the organic layer 300 and the second electrode 400 on each of the plurality of first electrodes 200.

The organic material layer 300 is formed by combining a hole injected from the first electrode 200 and an electron injected from the second electrode 400 to generate light, . The organic layer 300 is formed on the first electrode 200. The surface on which the groove 100g of the substrate 100 is partitioned as well as the top of each of the plurality of the conductive portions 210, The organic material layer 300 is deposited on the side surface of the organic layer 300. More specifically, as shown in Fig. 1, the surface on the upper portion of the alternately formed conductive portion 210 and the non-conductive portion (region corresponding to the second surface 120 of the substrate), the conductive portion and the non- An organic layer 300 is formed on the side of the third surface 130 and the conductive portion 210. [ Accordingly, the organic material layer 300 may have a shape in which grooves are formed between the organic material layers 300 formed on the conductive parts 210 arranged in series.

Hereinafter, an organic layer formed on the conductive portion 210 of the organic layer 300 formed on the first electrode 200 is referred to as a first organic region 310, a non-conductive portion of the first electrode 200, The organic layer formed on the second surface 120 is referred to as a second organic region 320 and the third surface 130 of the substrate 100 and the organic layer 300 formed on the sides of the conductive portion 210 may be referred to as a third organic region 330).

That is, the organic material layer 300 according to the embodiment is not a flat surface but a shape having a height step. In other words, the organic layer 300 according to the embodiment includes a first organic region 310 formed on the conductive portion 210, a non-conductive portion of the first electrode 200, or a second surface 120 of the substrate 100, And a third organic region 330 formed on a side of the third surface 130 and the conductive portion 210 of the substrate 100. [ The organic material layer 300 has an effect of increasing the surface area of the organic material layer 300 as compared with the planar organic material layer 300 as in the prior art.

The organic material layer 300 may include, for example, a hole transporting layer formed on the first electrode 200, a light emitting layer formed on the hole transporting layer, and an electron injecting layer formed on the light emitting layer.

The hole transport layer plays a role of facilitating the transfer of holes, for example, NPD (or NPB), TPD (N, N'-bis- (3-methylphenyl) -N, N'- , s-TAD and 4,4 ', 4 "-tris (N-3-methylphenyl-N-phenyl-amino) -triphenylamine). However, the present invention is not limited thereto.

The light emitting layer can use an organic material different depending on the color to be emitted. For example, the light emitting layer may include a material that emits red, green, blue, and white light, and may be formed using phosphorescent or fluorescent materials. For example, when the light emitting layer emits red light, a host material containing CBP (carbazole biphenyl) or mCP (1,3-bis (carbazol-9-yl)) and PIQIr (acac) (bis (1-phenylisoquinoline) acetylacetonate iridium ), PQIr (acac) bis (1-phenylquinoline) acetylacetonate iridium, PQIr (tris (1-phenylquinoline) iridium) and PtOEP (octaethylporphyrin platinum) (DBM) 3 (Phen) and perylene. When the light emitting layer 132 emits green light, a host material containing Alq ₃ (hydroxyquinoline aluminum), CBP or mCP, and Ir (ppy ) 3 (fac tris (2-phenylpyridine) iridium), and may be formed of a fluorescent dopant. When the light emitting layer emits blue light, a host material containing CBP or mCP and a fluorescent material such as FIrpic , (CF3ppy) 2Ir (pic) Alternatively, it may be made of a fluorescent material comprising any one selected from the group consisting of spiro-DPVBi, spiro-6P, distyrylbenzene (DSB), distyrylarylene (DSA), PFO polymer and PPV polymer. However, it is not limited to these materials, but various materials can be used.

The electron injection layer can be formed using LiF (lithium fluoride) or the like.

The organic material layer 300 may further include a hole injecting layer between the first electrode 200 and the hole transporting layer, and an electron transporting layer between the light emitting layer and the electron injecting layer. The hole injection layer serves to smoothly move the holes of the first electrode 200 to the hole transport layer and may be formed of Alq3, PBD, TAZ, LiF, spiro-PBD, BAlq or SAlq.

The electron transporting layer serves to smoothly transfer electrons from the electron injection layer to the light emitting layer. The electron transporting layer is a layer selected from the group consisting of Alq3 (tris (8-hydroxyquinolino) aluminum), PBD, TAZ, spiro- PBD, BAlq and SAlq But it is not limited thereto.

The second electrode 400 serves as a cathode for supplying electrons to the organic material layer 300. The second electrode 400 may have electrical conductivity and may be formed of a metal material having a predetermined reflectance so that light generated from the organic layer 300 may be reflected and directed toward the first electrode 200. For example, the second electrode 400 may be formed of Al or the like.

When the second electrode 400 is formed on the organic layer 300, not only the upper portion of each of the plurality of conductive portions 210 of the first electrode 200 formed under the organic layer 300, And a second electrode 400 is deposited on the side of the organic layer formed on the conductive part 210. [ That is, the second electrode 400 is formed on the second and third organic regions 310 and 320 as well as the first organic region 310 of the organic layer 300. More specifically, as shown in FIG. 1, the conductive portion 210 and the conductive portion 210 correspond to the third conductive portion 210, the third conductive portion 210, and the third conductive portion 130, And the second electrode 400 is formed in a region corresponding to the side surface of the conductive portion 210.

The second electrode 400 formed on the first organic region 310 of the organic material layer 300 among the second electrode 400 formed on the organic material layer 300 is referred to as a first conductive region 410, The second electrode 400 formed in the region 320 is referred to as a second conductive region 420 and the second electrode 400 formed in the third organic region 330 is referred to as a third conductive region 430.

The second electrode 400 has a shape in which the second conductive region 420 is disposed between the two first conductive regions 410 and the second conductive region 410 The second electrode 400 has a shape in which a groove is provided between the two first conductive regions 410. Thus, the partitioning of the groove 400g of the second electrode 400 becomes the second and third conductive regions 420 and 430.

As described above, the second electrode 400 according to the embodiment has a shape having a height step, not a flat surface. In other words, the upper surface of the second electrode 400 includes a first conductive region 410 corresponding to the outer surface on the upper side of the groove 400b, a second conductive region 420 corresponding to the bottom surface of the groove 400b And a third conductive region 430 formed on the bottom surface of the groove 400b in a direction perpendicular to or intersecting the second conductive region 420 and corresponding to a sidewall of the groove 400b. Here, each of the first to third conductive regions 410, 420, and 430 serves as a reflecting surface for reflecting at least a part of the light generated in the organic layer 300. That is, at least a part of the light generated from the first organic region 310 and the third organic region 330 corresponding to the conductive portion 210 is electrically connected to the first through third conductive regions 410, 420, and 430, respectively.

The first to third conductive regions 410, 420, and 430 of the second electrode 400 reflect the light incident into the organic layer 300 at least one time, The amount of light extracted to the side of the organic light emitting device is reduced, and the amount of light extracted in the downward direction where the substrate 100 is located is increased (see FIG. 4). That is, the light generated in the organic layer 300 is reflected by the second and third conductive regions 420 and 430, which serve as additional reflection surfaces as well as the first conductive region 410.

In other words, among the light generated from the organic material layer 300, light traveling upward is reflected from the first conductive region 410 of the second electrode 400. At least a portion of the light traveling in the lateral direction is reflected by at least one of the second conductive region 420 and the third conductive region 430 of the second electrode 430. That is, the second and third conductive regions 420 and 430 guide the light traveling in the lateral direction of the organic layer 300 toward the substrate 300. Accordingly, the amount of light emitted in the lateral direction of the substrate 100 can be reduced compared to the conventional one, and thus the amount of light emitted to the lower side of the substrate 100 can be increased.

On the other hand, in the case of the conventional organic light emitting device, the first electrode 200 has a shape having no step or groove 100g as shown in FIGS. Thus, the second electrode 400 does not have a step or a groove 100g. In this case, the amount of light extracted in the lateral direction of the substrate 100 is large, which is a factor for reducing the light extraction efficiency of the organic light emitting device.

Hereinafter, a method of manufacturing an organic light emitting device according to an embodiment of the present invention will be described with reference to FIGS. At this time, the contents overlapping with the above contents will be omitted or briefly explained.

A translucent substrate 100 such as glass is provided. The first electrode 200 is formed on the substrate 100. To this end, ITO (Indium-Tin-Oxide) is deposited on the substrate 100 by a sputtering method, for example, to form a conductive layer. Then, a plurality of regions are etched by photolithography and wet etching to remove the conductive layer. After the etching is finished, the remaining conductive layer is the conductive portion 210, and the substrate 100 is exposed under the region where the conductive layer is removed. Thereafter, the conductive layer is removed and the exposed substrate area is etched by a wet process.

Therefore, the first electrode 200 according to the embodiment includes a plurality of conductive portions 210 arranged in one direction and spaced apart from each other, and a region between the conductive portions 210 and the conductive portions 210, The height of the exposed substrate region is lower than that of the conductive portion 210. As described above, the substrate 100 is etched in a region between the conductive portion 210 and the conductive portion 210, so that the substrate 100 has a height (height) between the conductive portion 210 and the conductive portion 210 (Second surface 120) having a low bottom surface.

Next, an organic layer 300 is formed on the first electrode 200. That is, an organic material layer 300 is formed by depositing an organic material on the upper and side surfaces of the plurality of conductive parts 210 and the second and third surfaces 120 and 130 of the substrate 100. The organic material layer 300 may be, for example, a structure in which a hole transporting layer, a light emitting layer, and an electron transporting layer are stacked in this order. Here, the hole transport layer may be NPB, the light emitting layer may be Alq3, and the electron injection layer may be LiF.

Then, the second electrode 400 is formed on the electron transport layer of the organic material layer 300 by depositing Al having a high reflectivity, for example. That is, Al is deposited on each of the first to third organic regions 310, 320, and 330 of the organic material layer 300 to form the second electrode 400. The second electrode 400 includes a first conductive region 410 formed on the first organic region 310 of the organic layer 300 and a second conductive region 410 formed on the second and third organic regions 310 and 320 of the organic layer 300. [ And the second and third conductive regions 420 and 430 formed on the first and second conductive regions 420 and 430, respectively. Accordingly, the second electrode 400 is formed in a shape in which the groove 400g is provided between the two first conductive regions 410 arranged in series.

Hereinafter, the luminescent characteristics in the organic light emitting device according to the embodiments and the comparative examples of the present invention will be described with reference to Figs. 1 to 9. Fig.

The substrate 100, the first electrode 200, the organic layer 300, and the second electrode 400 according to the embodiment and the comparative example of the present invention are all formed of the same material. That is, the substrate 100 according to the embodiments and the comparative example is made of glass, the first electrode 200 is made of ITO, and the second electrode 400 is made of Al. The organic material layer 300 includes a hole transport layer formed of NPB, a light emitting layer formed of Alq3, and an electron injection layer formed of LiF.

As shown in FIG. 1, the first electrode 200 includes a plurality of conductive portions 210 arranged in one direction and spaced apart from each other. A region of the substrate 100 between the two conductive portions 210 arranged in a row has a lower height than a region of the substrate 100 on which the conductive portion 210 is formed. In other words, the substrate 100 according to the embodiment includes a plurality of grooves 100g spaced apart in the direction in which the plurality of conductive parts 210 are arranged. At this time, the conductive parts 210 of the first electrode 200 and the grooves 100g of the substrate 100 are alternately arranged in a plurality of directions in one direction. In addition, the second electrode 200 according to the embodiment has a structure in which a groove 400g is provided between two first conductive regions 410 that are continuously arranged.

The first electrode 200 according to the comparative example has a plurality of conductive portions 210 spaced apart from each other as in the present invention or a groove 100g is not provided between the plurality of conductive portions 210, (100) is not a shape having a plurality of grooves (100g) as in the embodiment of the present invention. That is, the upper surface of the substrate 100 according to the comparative example is a flat surface having no groove, and the first electrode 200 is also a structure in which the conductive portion is continuously formed on the upper surface of the substrate 100.

Referring to FIG. 7, the luminance (cd / m ² ) according to the current density (mA / cm ² ) of the organic light emitting device according to the embodiment and the comparative example formed by the above- Brightness is high. 8, the current efficiency according to the current density is higher than that of the comparative example.

In the case of the first electrode 200 according to the embodiment of the present invention, since the non-conductive portion is provided between the conductive portion 210 and the conductive portion 210, the area of the conductive region Is small. However, referring to FIG. 7, since the embodiment has a higher luminance according to the current density than the conventional one, in the embodiment, even though the conductive region is smaller than the conventional one, the first to third conductive regions 410, 420, and 430, it is seen that it exhibits excellent luminance characteristics as compared with the conventional one. That is, although the conductive region is reduced compared to the prior art, the light directed in the lateral direction can be directed toward the substrate due to the shape of the second electrode 400 according to the embodiment, The amount of emitted light is reduced, and the amount of light emitted toward the substrate is increased, so that the brightness is improved as compared with the conventional method.

9 and 10, in the case of the organic light emitting device according to the comparative example, the amount of light extracted in the lateral direction of the substrate is large. However, the organic light emitting device according to the embodiment has the advantage that The amount of light emitted by the light source is considerably reduced. As a result, it can be seen that the organic light emitting device according to the embodiment has higher light extraction efficiency in the downward direction of the substrate than the comparative example.

As described above, in the embodiment of the present invention, the first electrode 200 is formed so as to have a plurality of conductive portions 210 arranged in one direction and spaced apart from each other, A groove 100g is provided in the region of the substrate 100. [ The second electrode 400 formed on the first electrode 200 also has a plurality of grooves 400g spaced apart in one direction. Therefore, at least a part of the light generated in the organic layer 300 is reflected at least once inside the groove 400g of the second electrode 400, thereby reducing the amount of light extracted to the side of the organic light emitting device, It is possible to increase the amount of light extracted in the downward direction where the light source 100 is located.

100: substrate 100 g: groove
200: first electrode 210: conductive part
300: organic layer 400: second electrode

Claims (8)

A substrate having a plurality of grooves arranged in one direction and spaced apart from each other, the substrate having a light-transmitting property;
A first electrode having a plurality of conductive portions spaced apart from each other so as to be alternately arranged with the grooves, the first electrodes being arranged in the array direction of the plurality of grooves on the substrate;
An organic material layer formed on peripheral walls of the plurality of grooves and the first electrode of the substrate to generate light; And
A second electrode formed on the organic material layer;
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Wherein the upper surface of the substrate has a plurality of first surfaces spaced from one another and spaced from one another and a height lower than that of the first surface, Wherein the second surface has a step difference by a height difference between the first surface and the second surface,
Wherein an upper surface of the substrate includes a third surface extending from the second surface to the first surface,
The organic layer is formed on the conductive portion, on the second and third surfaces of the substrate,
The organic material layer
A first organic region formed on the conductive portion;
A second organic region formed on a second surface of the substrate; And
A third organic region formed on a third surface of the substrate;
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Wherein the second electrode is formed on the first to third organic regions and is arranged in a row direction of a plurality of grooves provided in the substrate and has a shape having a plurality of spaced apart grooves. The method according to claim 1,
Wherein the first electrode is transparent and the second electrode is reflective. delete delete A step of providing a light-transmitting substrate;
Forming a light-transmitting conductive layer on the substrate;
Etching a plurality of partial regions of the conductive layer to form a plurality of conductive portions spaced apart from each other in one direction to form a first electrode;
Forming a plurality of grooves in the substrate such that the substrate regions corresponding to the two conductive portions are successively etched so as to be aligned in the array direction of the plurality of conductive portions and alternately positioned with the conductive portions;
Forming an organic material layer on a peripheral wall of the plurality of grooves and the first electrode of the substrate; And
Forming a second electrode on the organic material layer;
/ RTI >
Wherein a plurality of grooves are provided in the substrate so as to be alternate with the conductive portions,
Wherein the upper surface of the substrate is a surface on which the conductive part is formed, the plurality of first surfaces spaced apart in one direction and spaced apart from each other, and the second surface being lower in height than the first surface, A plurality of second spaced apart surfaces having a step difference by a height difference between the first surface and the second surface,
Wherein a plurality of grooves are provided in the substrate so as to be alternate with the conductive portions,
Wherein an upper surface of the substrate includes a third surface extending from the second surface to the first surface,
The organic layer is formed on the conductive portion, on the second and third surfaces of the substrate,
When an organic material layer is formed on the first electrode,
The organic layer is formed to include a first organic region formed on the conductive portion, a second organic region formed on the second surface of the substrate, and a third organic region formed on the third surface of the substrate,
Wherein the second electrode is formed on the first to third organic regions and is arranged in a row direction of a plurality of grooves provided in the substrate and has a plurality of grooves spaced apart from each other. The method of claim 5,
Wherein the second electrode is formed of a material having a reflective property. delete delete

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