KR20170141831A - Organic light emitting device and Method for manufacturing the same - Google Patents

Abstract

According to an embodiment of the present invention, an organic light emitting device comprises: an organic lighting emitting unit for generating light; a substrate being in contact with the organic light emitting unit; a first adhesive layer being in contact with the substrate, and having transparent properties to transmit light generated in the organic light emitting unit, wherein the first adhesive layer has a first surface being in contact with the substrate; and a second adhesive layer being in contact with the first adhesive layer, and having transparent properties to transmit light generated in the organic light emitting unit, wherein the second adhesive layer has a second surface which is a surface having light from the organic light emitting unit exited to the outside therefrom. The first surface has a surface roughness lower than that of the second surface not to allow an air gap to exist in the first adhesive layer. The second surface has a surface roughness higher than that of the first surface to exit light from the organic light emitting unit to the outside. The second surface has adhesive force lower than that of the first surface.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic light emitting device,

An embodiment relates to an organic light emitting device.

An embodiment relates to a method of manufacturing an organic light emitting device.

In general, a light emitting device can be broadly divided into an organic light emitting device that forms an emission layer using an organic material and an inorganic light emitting device that forms an emission layer using an inorganic material. In the organic light emitting device, an electron injected from an electron injection electrode and holes injected from an anode are combined in an organic light emitting layer to form an exciton, Emitting device that emits light while emitting light, has advantages such as low power driving, self light emission, wide viewing angle, realization of high resolution and color, and fast response speed.

In recent years, researches have been actively conducted to apply such an organic light emitting device to an information display window of a portable information device, a camera, a clock, an office device, an automobile, a television, a display, or an illumination.

In order to improve the luminous efficiency of the organic luminescent device as described above, there is a method of increasing the luminous efficiency of the material constituting the luminous layer or improving the luminous efficiency of the luminous luminous layer.

1 is a view showing a conventional organic light emitting device.

Referring to FIG. 1, a conventional organic light emitting device 1 includes an organic light emitting portion 10, a substrate 20, an adhesive layer 30, a base film 40, and a light extracting film 50.

The organic light emitting portion 10 may include a first electrode, a second electrode, and an organic light emitting layer disposed between the first electrode and the second electrode. When power is supplied to the first electrode and the second electrode, electrons and holes are injected into the organic light emitting layer, and the excitons in which the injected holes and electrons are excited are transited from the excited state to the ground state to emit light.

Light generated in the organic light emitting portion 10 may be transmitted through the substrate 20, the adhesive layer 30, the base film 40, and the light extracting film 50 to be output to the outside.

A large amount of loss occurs due to a difference in refractive index between the process of transmitting light generated in the organic light emitting portion 10 and the process of transmitting the substrate 20, the adhesive layer 30, and the base film 40, So that the light efficiency is low.

Recently, a structure has been proposed in which a light extracting film 50 is additionally formed under the base film 40 to improve the light efficiency by compensating the refractive index between the outside and the base film 40.

The adhesive layer 30, the base film 40, and the light extracting film 50, even though the light extracting film 50 is attached to the organic light emitting portion 10, There is a problem that a desired light efficiency can not be achieved.

The embodiment provides an organic light emitting device capable of improving light efficiency.

The embodiment provides a method of manufacturing an organic light emitting device capable of improving light efficiency.

An organic light emitting device according to an embodiment includes an organic light emitting unit for generating light; A substrate in contact with the organic light emitting portion; A first adhesive layer having a transparent property to contact the substrate and transmit light generated in the organic light emitting portion, the first adhesive layer having a first surface in contact with the substrate; And a second adhesive layer having a transparent property to contact the first adhesive layer and transmit the light generated in the organic light emitting portion, wherein the second adhesive layer includes a second surface which is a surface from which light from the organic light emitting portion is emitted to the outside, Wherein the first surface has a lower surface roughness than the second surface so as to prevent an air gap between the substrate and the first adhesive layer from being present, The second surface has a lower adhesive force than the first surface, and the second surface has a lower adhesive force than the first surface.

An organic light emitting device according to an embodiment includes an organic light emitting unit for generating light; A substrate in contact with the organic light emitting portion; A first adhesive layer having a transparent property to contact the substrate and transmit light generated in the organic light emitting portion, the first adhesive layer having a first surface in contact with the substrate; And a second adhesive layer having a transparent property to contact the first adhesive layer and transmit the light generated in the organic light emitting portion, wherein the second adhesive layer includes a second surface which is a surface from which light from the organic light emitting portion is emitted to the outside, Wherein the first surface has a lower surface roughness than the second surface so as to prevent an air gap between the substrate and the first adhesive layer from being present, The second adhesive layer has a higher hardness than the first adhesive layer, and the second adhesive layer has a higher hardness than the first adhesive layer.

An organic light emitting device according to an embodiment includes an organic light emitting unit for generating light; A substrate in contact with the organic light emitting portion; And an adhesive layer having a transparent property to contact the substrate and transmit light generated in the organic light emitting portion, wherein the adhesive layer includes a first region adjacent to the substrate and a second region spaced from the substrate, , And the second region comprises a photo-curable material.

A method of manufacturing an organic light emitting diode according to an embodiment of the present invention includes: attaching a first adhesive layer to a substrate having an organic light emitting portion; Attaching a second adhesive layer to the first adhesive layer; Forming an uneven pattern on a surface of the second adhesive layer that is spaced apart from the first adhesive layer; And curing the second adhesive layer.

The organic light emitting device according to the embodiment can improve the light efficiency by forming the surface roughness of one side of the adhesive layer larger than the other side.

The method of manufacturing an organic light emitting diode according to an embodiment of the present invention can improve the light efficiency by curing a part of the adhesive layer.

1 is a view showing a conventional organic light emitting device.
2 is a cross-sectional view of the organic light emitting device according to the first embodiment.
3 is a cross-sectional view of an organic light emitting device according to the first embodiment.
4 is a view showing a second adhesive layer according to the first embodiment.
5 is a view showing the structure of another concavo-convex pattern.
6 is a cross-sectional view of an organic light emitting device according to a second embodiment.
7 is a view showing the back surface of the second adhesive layer according to the second embodiment.
8 is a cross-sectional view of an organic light emitting device according to the third embodiment.
9 is a view showing the back surface of the second adhesive layer according to the third embodiment.
10 is a cross-sectional view of an organic light emitting device according to a fourth embodiment.
11 is a view showing the back surface of the second adhesive layer according to the fourth embodiment.
12 is a cross-sectional view of an organic light emitting diode according to a fifth embodiment.
13 is a flowchart showing a method of manufacturing an organic light emitting diode according to the first embodiment.
14 is a view showing a method of forming a concave-convex pattern of a roll-to-roll method.
15 is a graph showing the intensity of light according to wavelength of the organic light emitting diode according to the first embodiment.
16 is a graph showing the intensity of light according to wavelengths of the organic light emitting diode according to the first to fourth embodiments.
17 is a graph showing the intensities of light for respective wavelengths of the organic light emitting diode according to the first to fourth embodiments.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept. Other embodiments falling within the scope of the inventive concept may readily be suggested, but are also considered to be within the scope of the present invention.

The same reference numerals are used to designate the same components in the same reference numerals in the drawings of the embodiments.

An organic light emitting device according to an embodiment includes an organic light emitting unit for generating light; A substrate in contact with the organic light emitting portion; A first adhesive layer having a transparent property to contact the substrate and transmit light generated in the organic light emitting portion, the first adhesive layer having a first surface in contact with the substrate; And a second adhesive layer having a transparent property to contact the first adhesive layer and transmit the light generated in the organic light emitting portion, wherein the second adhesive layer includes a second surface which is a surface from which light from the organic light emitting portion is emitted to the outside, Wherein the first surface has a lower surface roughness than the second surface so as to prevent an air gap between the substrate and the first adhesive layer from being present, The second surface has a lower adhesive force than the first surface, and the second surface has a lower adhesive force than the first surface.

The surface roughness of the second surface can be realized by a concavo-convex pattern.

The light emitted from the organic light emitting part may be output to the outside by changing the optical path by the uneven pattern.

The concavo-convex pattern may have a triangular cross-section.

The surface roughness of the second surface can be realized by the light-transmitting beads.

The surface roughness of the second surface can be realized by a random wrinkle pattern.

The first adhesive layer may have a refractive index corresponding to the second adhesive layer.

The first adhesive layer may have a refractive index corresponding to the substrate.

Wherein the first adhesive layer includes a third surface opposed to the first surface and the second adhesive layer includes a fourth surface facing the second surface, and the third surface and the fourth surface comprise the first And may have a surface roughness corresponding to the surface.

The second adhesive layer may have a higher hardness than the first adhesive layer.

The second adhesive layer may comprise a curable material.

An organic light emitting device according to an embodiment includes an organic light emitting unit for generating light; A substrate in contact with the organic light emitting portion; A first adhesive layer having a transparent property to contact the substrate and transmit light generated in the organic light emitting portion, the first adhesive layer having a first surface in contact with the substrate; And a second adhesive layer having a transparent property to contact the first adhesive layer and transmit the light generated in the organic light emitting portion, wherein the second adhesive layer includes a second surface which is a surface from which light from the organic light emitting portion is emitted to the outside, Wherein the first surface has a lower surface roughness than the second surface so as to prevent an air gap between the substrate and the first adhesive layer from being present, The second adhesive layer has a higher hardness than the first adhesive layer, and the second adhesive layer has a higher hardness than the first adhesive layer.

The second adhesive layer may comprise a curable material.

The second adhesive layer may include light-transmitting beads.

A plurality of scratches may be formed on the second surface.

An organic light emitting device according to an embodiment includes an organic light emitting unit for generating light; A substrate in contact with the organic light emitting portion; And an adhesive layer having a transparent property to contact the substrate and transmit light generated in the organic light emitting portion, wherein the adhesive layer includes a first region adjacent to the substrate and a second region spaced from the substrate, , And the second region comprises a photo-curable material.

The surface of the adhesive layer adjacent to the substrate may have a lower surface roughness than a surface spaced apart from the substrate.

A method of manufacturing an organic light emitting diode according to an embodiment of the present invention includes: attaching a first adhesive layer to a substrate having an organic light emitting portion; Attaching a second adhesive layer to the first adhesive layer; Forming an uneven pattern on a surface of the second adhesive layer that is spaced apart from the first adhesive layer; And curing the second adhesive layer.

The step of curing the second adhesive layer may be a step of curing using UV.

Hereinafter, an organic light emitting device according to an embodiment will be described with reference to the drawings.

2 is a cross-sectional view of the organic light emitting device according to the first embodiment.

Referring to FIG. 2, the organic light emitting diode 101 according to the first embodiment may include an organic light emitting portion 110, a substrate 120, a first adhesive layer 130, and a second adhesive layer 140.

The organic light emitting portion 110 may be positioned on the substrate 120. The organic light emitting portion 110 may include a first electrode located on the substrate 120, an organic light emitting layer formed on the first electrode, and a second electrode formed on the organic light emitting layer, though not shown in detail. .

The first electrode may be a hole injection electrode (anode electrode), and the second electrode may be an electron injection electrode (cathode electrode). The organic light emitting layer may include a hole injection layer (HIL), a hole transport layer (HTL), a light emitting layer (EML), an electron transport layer (ETL), and an electron injection layer (EIL) sequentially stacked from the first electrode.

When power is supplied to the first electrode and the second electrode, holes and electrons are injected into the organic light emitting layer from the first electrode and the second electrode, respectively, and excitons, in which the injected holes and electrons are coupled, The light is emitted while being transited.

The first electrode may comprise a transparent conductive material, and the second electrode may comprise an opaque conductive material. The second electrode may be formed of a reflective material to reflect the light generated from the organic light emitting layer and to transmit the light toward the substrate 10.

The substrate 120 may be formed of a material capable of transmitting light. The substrate 120 may transmit light generated by the organic light emitting unit 110 to the first adhesive layer 130.

The first adhesive layer 130 may be positioned below the substrate 120. The first adhesive layer 130 may be attached to the substrate 120. The first adhesive layer 130 may be attached to one surface of the substrate 120 spaced apart from the organic light emitting portion 110.

The first adhesive layer 130 may include a first surface 130a and a second surface 130b. The first surface 130a may be defined as a surface contacting with the substrate 120 and the second surface 130b may be defined as a surface spaced from the substrate 120. [ The second surface 130b may be a surface contacting the second adhesive layer 140. [

The first surface 130a and the second surface 130b may have an adhesive force. The first adhesive layer 130 and the substrate 120 can be adhered to each other by the adhesive force of the first surface 130a.

One side of the substrate 120 and the first side 130a may have a corresponding shape. The first surface 130a may be a flat surface. The first surface 130a may have a surface roughness corresponding to one surface of the substrate 120. [ The first surface 130a may be formed as a flat surface so that the first adhesive layer 130 and the substrate 120 may be attached without an air gap. It is possible to prevent light transmitted from the substrate 120 to the first adhesive layer 130 from being scattered by the absence of an air gap between the first adhesive layer 130 and the substrate 120. The light transmitted through the substrate 120 can be transmitted to the first adhesive layer 130 with a small loss by preventing scattering of light transmitted from the substrate 120 to the first adhesive layer 130 .

The first adhesive layer 130 may have a refractive index corresponding to the substrate 120. The first adhesive layer 130 and the substrate 120 have refractive indexes corresponding to each other, thereby reducing light reflected by the first surface 130a.

The first adhesive layer 130 may be composed of a polymer having a combination of at least one of silicone, epoxy, and acrylic. The first adhesive layer 130 may be formed of a material that transmits light.

The second adhesive layer 140 may be positioned below the first adhesive layer 130. The second adhesive layer 140 may be attached to the first adhesive layer 130. The second adhesive layer 140 may be attached to the second surface 130b of the first adhesive layer 130. [

The second adhesive layer 140 may include a third surface 140a and a fourth surface 140b. The third surface 140a may be defined as a surface contacting with the first adhesive layer 130 and the fourth surface 140b may be defined as a surface spaced from the first adhesive layer 130. [ The third surface 140a may be a surface contacting the second surface 130b of the first adhesive layer 130. [

The third surface 140a may have an adhesive force. The first adhesive layer 130 and the second adhesive layer 140 can be adhered to each other by the adhesive force of the third surface 140a.

Alternatively, the third surface 140a may have a state of not having adhesive force after curing in a state of having an adhesive force before curing. Alternatively, the third surface 140a may not have adhesive force. Also in this case, the first adhesive layer 130 and the second adhesive layer 140 can be bonded by the adhesive force of the second surface 130b of the first adhesive layer 130. [

The second surface 130b and the third surface 140a may have a corresponding shape. The third surface 140a may be a flat surface. The third surface 140a may have a surface roughness corresponding to the second surface 130b. The third surface 140a may have a surface roughness corresponding to the first surface 130a. The third surface 140a may be formed as a flat surface so that the first adhesive layer 130 and the second adhesive layer 140 may be adhered without air gaps. Since there is no air gap between the first adhesive layer 130 and the second adhesive layer 140, it is possible to prevent light transmitted from the first adhesive layer 130 to the second adhesive layer 140 from being scattered have. The light transmitted through the first adhesive layer 130 is prevented from being scattered by the second adhesive layer 140 so that the light transmitted through the first adhesive layer 130 is transmitted to the second adhesive layer 140 Lt; / RTI >

The fourth surface 140b may have a surface roughness different from that of the third surface 140a. The fourth surface 140b may have a surface roughness different from that of the first surface 130a and the second surface 130b of the first adhesive layer 130. [

The fourth surface 140b may have a surface roughness higher than that of the first surface 130a, the second surface 130b, and the third surface 140a.

The fourth surface 140b has a surface roughness higher than that of the first surface 130a, the second surface 130b and the third surface 140a so that the amount of light emitted from the second adhesive layer 140 to the outside .

The second adhesive layer 140 may have a plurality of concave-convex patterns 141 as shown in FIG. 3 and FIG. The concavo-convex pattern 141 may be formed on the fourth surface 140b of the second adhesive layer 140. [ The concave-convex pattern 141 may be formed in a direction in which light from the organic light emitting portion 110 is emitted.

The concave-convex pattern 141 may have a triangular cross-section. The plurality of concave-convex patterns 141 may extend in a parallel direction. The concave-convex pattern 141 may include a protrusion 142 and a depression 143. The protrusions 142 and the depressions 143 may be alternately arranged. The concave-convex pattern 141 may be formed integrally with the second adhesive layer 140.

Although the concavo-convex patterns 141 are arranged at regular intervals in the drawing, the concavo-convex patterns 141 may be disposed at random intervals.

The light emitted from the organic light emitting unit 110 may be changed in the optical path after passing through the substrate 120 and the first adhesive layer 130 and then passing through the fourth surface 140b. Light passing through the fourth surface 140b may be output to the outside by changing the optical path by the uneven pattern 141.

The fourth surface 140b has an angle different from that of the third surface 140a by the projecting portion 142 and the depression 143 of the concave and convex pattern 141 and is generated in the organic light emitting portion 110 The light path can be output to the outside by changing the optical path through the fourth surface 140b having an angle different from the third surface 140a. The fourth surface 140b has an angle different from the third surface 140a, so that the light reflected by the fourth surface 140b is reduced, and as a result, light output to the outside increases. As the light output to the outside increases, the light efficiency of the organic light emitting device 101 can be improved.

The fourth surface 140b may have a larger surface area than the third surface 140a.

At least a portion of the second adhesive layer 140 may have a different hardness from the first adhesive layer 130. At least a portion of the second adhesive layer 140 may have a higher hardness than the first adhesive layer 130. The second adhesive layer 140 may have a hardness different from that of the first adhesive layer 130. The second adhesive layer 140 may have a higher hardness than the first adhesive layer 130.

The fourth surface 140b of the second adhesive layer 140 may have a different hardness from that of the first adhesive layer 130. The fourth surface 140b of the second adhesive layer 140 may have a higher hardness than the first adhesive layer 130. [

The second adhesive layer 140 may be formed of a polymer having a combination of at least one of silicone, epoxy, and acrylic. The second adhesive layer 140 may be formed of a material that transmits light.

The second adhesive layer 140 may further include a curable material. The curable material may be a photo-curable material, a thermoset material, a chemically-curable material, or a plasma-curable material.

The second adhesive layer 140 may be cured by the curable material. That is, the second adhesive layer 140 is adhered to the first adhesive layer 130 with adhesive force, and then the curable material is cured by the curing process to cure the entire second adhesive layer 140. The second adhesive layer 140 may be cured and the adhesive force may be extinguished. The fourth surface 140b of the second adhesive layer 140 may be cured to have a lower adhesive force than the first surface 130a or the second surface 130b of the first adhesive layer 130. [ The fourth surface 140b of the second adhesive layer 140 may lose adhesion due to curing.

The second adhesive layer 140 is cured to prevent foreign substances from adhering to the outside, thereby improving the light efficiency.

5 is a view showing the structure of another concavo-convex pattern.

The second adhesive layer 140 of the organic light emitting diode according to the first embodiment may have a concavo-convex pattern 141 having a circular cross section as shown in FIG. 5A. 5A, the concave-convex pattern 141 may have a depressed shape from the fourth surface 140b of the second adhesive layer 140. As shown in FIG. The concave-convex pattern 141 may have a cylindrical shape and may have a depressed shape from the surface of the second adhesive layer 140. The fourth surface 140b may have a surface roughness higher than that of the third surface 140a by the uneven pattern 141.

The second adhesive layer 140 of the organic light emitting diode according to the first embodiment may have a concavo-convex pattern 141 having a circular cross section as shown in FIG. 5B. 5B, the concave-convex pattern 141 may have a shape in which the cross-sectional area decreases from the fourth surface 140b toward the third surface 140a. The concave-convex pattern 141 may have a depressed shape from the fourth surface 140b. The concave-convex pattern 141 may have a conical shape that is depressed from the surface of the second adhesive layer 140. The fourth surface 140b may have a surface roughness higher than that of the third surface 140a by the uneven pattern 141.

The second adhesive layer 140 of the organic light emitting diode according to the first embodiment may have a concavo-convex pattern 141 having a circular cross section as shown in FIG. 5C. 5C, the uneven pattern 141 may have a cylindrical shape protruding from the fourth surface 140b. The fourth surface 140b may have a surface roughness higher than that of the third surface 140a by the uneven pattern 141. Although not shown, the concave-convex pattern 141 may have a conical shape protruding from the fourth surface 140b.

The second adhesive layer 140 of the organic light emitting diode according to the first embodiment may have a concavo-convex pattern 141 having a honeycomb structure as shown in FIG. 5D. Although the protruded honeycomb structure is shown in the drawing, the second adhesive layer 140 may have a recessed honeycomb structure. The fourth surface 140b may have a surface roughness higher than that of the third surface 140a by the uneven pattern 141.

FIG. 6 is a cross-sectional view of an organic light emitting diode according to a second embodiment, and FIG. 7 is a rear view of a second adhesive layer according to the second embodiment.

The organic light emitting device according to the second embodiment differs from the first embodiment in the structure of the second adhesive layer, and the remaining components are the same. Therefore, in describing the second embodiment, the same reference numerals are assigned to the same components as those of the first embodiment, and a detailed description thereof is omitted.

6 and 7, the organic light emitting device 101 according to the second embodiment includes an organic light emitting portion 110, a substrate 120, a first adhesive layer 130, and a second adhesive layer 140 .

The organic light emitting portion 110 may be positioned on the substrate 120. The first adhesive layer 130 may be positioned below the substrate 120. The second adhesive layer 140 may be positioned below the first adhesive layer 130.

The first adhesive layer 130 may include a first surface 130a and a second surface 130b and the second adhesive layer 140 may include a third surface 140a and a fourth surface 140b can do.

The first surface 130a, the second surface 130b, and the third surface 140a may have corresponding surface roughnesses. The first surface 130a, the second surface 130b, and the third surface 140a may have the same surface roughness.

The fourth surface 140b may have a surface roughness different from that of the third surface 140a. The fourth surface 140b may have a higher surface roughness than the third surface 140a. The second adhesive layer 140 may include a plurality of beads 145. The fourth surface 140b of the second adhesive layer 140 may have a higher surface roughness than the third surface 140a by the plurality of beads 145. [

The fourth surface 140b of the second adhesive layer 140 has a higher surface roughness than the third surface 140a by the beads 145 so that the path of the light passing through the fourth surface 140b is changed . The fourth surface 140b has a higher surface roughness than the third surface 140a so that the light reflected by the fourth surface 140b of the light incident from the organic light emitting portion 110 can be reduced . As a result, light output to the outside increases, and as a result, the light efficiency of the organic light emitting element 101 can be improved.

The plurality of beads 145 may be attached to the fourth surface 140b. The plurality of beads 145 may be formed by impregnating a part of the beads 145 in the second adhesive layer 140. The plurality of beads 145 may be randomly disposed on the fourth surface 140b.

The beads 145 may be formed of a light-transmitting material. The beads 145 may have a refractive index corresponding to the second adhesive layer 140. The beads 145 may be formed of the same material as the second adhesive layer 140.

FIG. 8 is a cross-sectional view of an organic light emitting diode according to a third embodiment, and FIG. 9 is a diagram showing a back surface of a second adhesive layer according to the third embodiment.

The organic light emitting device according to the third embodiment differs from the first embodiment in the structure of the second adhesive layer, and the remaining components are the same. Therefore, in describing the third embodiment, the same reference numerals are assigned to the components common to those of the first embodiment, and a detailed description thereof is omitted.

8 and 9, the organic light emitting diode 101 according to the third embodiment includes an organic light emitting portion 110, a substrate 120, a first adhesive layer 130, and a second adhesive layer 140 .

The organic light emitting portion 110 may be positioned on the substrate 120. The first adhesive layer 130 may be positioned below the substrate 120. The second adhesive layer 140 may be positioned below the first adhesive layer 130.

The first adhesive layer 130 may include a first surface 130a and a second surface 130b and the second adhesive layer 140 may include a third surface 140a and a fourth surface 140b can do.

The first surface 130a, the second surface 130b, and the third surface 140a may have corresponding surface roughnesses. The first surface 130a, the second surface 130b, and the third surface 140a may have the same surface roughness.

The fourth surface 140b may have a surface roughness different from that of the third surface 140a. The fourth surface 140b may have a higher surface roughness than the third surface 140a. The second adhesive layer 140 may include a plurality of impregnated beads 147. The fourth surface 140b of the second adhesive layer 140 may have a higher surface roughness than the third surface 140a by the plurality of impregnated beads 147. [

The fourth surface 140b of the second adhesive layer 140 has a higher surface roughness than the third surface 140a by the impregnated beads 147 so that the path of the light passing through the fourth surface 140b is changed . The fourth surface 140b has a higher surface roughness than the third surface 140a so that the light reflected by the fourth surface 140b of the light incident from the organic light emitting portion 110 can be reduced . As a result, light output to the outside increases, and as a result, the light efficiency of the organic light emitting element 101 can be improved.

In addition, the path of light traveling in the second adhesive layer 140 may be changed by the impregnated beads 147 inside the second adhesive layer 140. The path of the light traveling inside the second adhesive layer 140 is changed by the impregnated beads 147 so that the light reaching the fourth surface 140b can have various angles. By varying the angle of the light reaching the fourth surface 140b, the light reflected by the fourth surface 140b is reduced and the light efficiency can be improved.

At least some of the plurality of impregnated beads 147 may be exposed to the outside of the fourth surface 140b. The plurality of impregnated beads 147 may be randomly arranged.

The impregnated beads 147 may be formed of a light-transmitting material.

FIG. 10 is a cross-sectional view of an organic light emitting diode according to a fourth embodiment, and FIG. 11 is a diagram showing a rear surface of a second adhesive layer according to the fourth embodiment.

The organic light emitting device according to the fourth embodiment differs from the first embodiment in the structure of the second adhesive layer, and the remaining components are the same. Therefore, in describing the fourth embodiment, the same reference numerals are assigned to the components common to those of the first embodiment, and a detailed description thereof will be omitted.

10 and 11, the organic light emitting diode 101 according to the fourth embodiment includes an organic light emitting portion 110, a substrate 120, a first adhesive layer 130, and a second adhesive layer 140 .

The organic light emitting portion 110 may be positioned on the substrate 120. The first adhesive layer 130 may be positioned below the substrate 120. The second adhesive layer 140 may be positioned below the first adhesive layer 130.

The first adhesive layer 130 may include a first surface 130a and a second surface 130b and the second adhesive layer 140 may include a third surface 140a and a fourth surface 140b can do.

The first surface 130a, the second surface 130b, and the third surface 140a may have corresponding surface roughnesses. The first surface 130a, the second surface 130b, and the third surface 140a may have the same surface roughness.

A wrinkle pattern 149 may be formed on the second adhesive layer 140. The pleated pattern 149 may be formed on the fourth surface 140b. The corrugation pattern 149 may be formed in a random distribution. The fourth surface 140b can have a higher surface roughness than the third surface 140a by the wrinkle pattern 149. [

The fourth surface 140b of the second adhesive layer 140 has a higher surface roughness than the third surface 140a by the wrinkle pattern 149 so that the path of the light passing through the fourth surface 140b is changed . The fourth surface 140b has a higher surface roughness than the third surface 140a so that the light reflected by the fourth surface 140b of the light incident from the organic light emitting portion 110 can be reduced . As a result, light output to the outside increases, and as a result, the light efficiency of the organic light emitting element 101 can be improved.

12 is a cross-sectional view of an organic light emitting diode according to a fifth embodiment.

The organic light emitting device according to the fifth embodiment differs from the first embodiment in that it includes one adhesive layer, and the remaining components are the same. Therefore, in describing the fifth embodiment, the same reference numerals are assigned to the components common to those of the first embodiment, and a detailed description thereof will be omitted.

Referring to FIG. 12, the organic light emitting diode 101 according to the fifth embodiment may include an organic light emitting portion 110, a substrate 120, and an adhesive layer 150.

The organic light emitting portion 110 may be positioned on the substrate 120. The adhesive layer 150 may be positioned below the substrate 120.

The adhesive layer 150 may include a fifth surface 150a and a sixth surface 150b. The fifth surface 150a may be a surface contacting one surface of the substrate 120 and the sixth surface 150b may be a surface spaced from the substrate 120. [

The sixth surface 150b may have a surface roughness different from that of the fifth surface 150a. The sixth surface 150b may have a surface roughness higher than that of the fifth surface 150a. The sixth surface 150b has a higher surface roughness than the fifth surface 150a, so that the amount of light emitted to the outside from the adhesive layer 150 can be increased.

The adhesive layer 150 may have a plurality of concave-convex patterns 151. The concave-convex pattern 151 may be formed on the fifth surface 150a of the adhesive layer 150. The concavo-convex pattern 151 may be formed in a direction in which light is emitted from the organic light emitting portion 110. The sixth surface 150b may have a surface roughness higher than the fifth surface 150a by the uneven pattern 151. [ The concave-convex pattern 151 may be formed integrally with the adhesive layer 150.

The light generated from the organic light emitting unit 110 may be changed in the light path passing through the substrate 120 and passing through the sixth surface 150b. Light passing through the sixth surface 150b may be output to the outside by changing the optical path by the uneven pattern 141. [

At least some regions of the adhesive layer 150 may have different hardness from the other regions. The area adjacent to the sixth surface 150b may have a higher hardness than the area adjacent to the fifth surface 150a.

A region adjacent to the fifth surface 150a in the adhesive layer 150 may be defined as a first region and a region adjacent to the sixth surface 150b may be defined as a second region. The first region may be a region adjacent to the substrate 120, and the second region may be a region spaced apart from the substrate 120. And a region including at least the sixth surface 150b may be defined as a second region.

The second region may have a higher hardness than the first region. At least the sixth surface 150b may have a higher hardness than the other regions in the adhesive layer 150. [

The second region may further comprise a curable material. The second region may be cured by the curable material. That is, the adhesive layer 150 is adhered to the substrate 120 with an adhesive force, and then the curable material is cured by the curing process, so that the second region can be cured. The adhesive layer 150 may be cured and the adhesive force may be extinguished. The sixth surface 150b of the adhesive layer 150 may be cured to have a lower adhesive force than the fifth surface 150a. The adhesion of the sixth surface 150b may be extinguished by curing.

The adhesive layer 150 is cured to prevent foreign substances from adhering to the outside, and the light efficiency is improved.

As another example, the density of the cured material may gradually decrease gradually from the sixth surface 150b toward the fifth surface 150a. That is, a larger number of curing materials may be included in the direction from the fifth surface 150a toward the sixth surface 150b. When the adhesive layer 150 is cured, the degree of curing varies depending on the density of the cured material. As a result, the hardness increases from the fifth surface 150a toward the sixth surface 150b, and the sixth surface 150b may have a higher hardness than the fifth surface 150a.

As another example, the adhesive layer 150 may include a uniform curing material in the entire region. When the adhesive layer 150 is cured, only a region adjacent to the sixth surface 150b may be cured, and the remaining region may not be cured. Only the area adjacent to the sixth surface 150b may be hardened to have a higher hardness than the remaining area. The curing for a certain region can be implemented by a method of irradiating light to only a part of the region or a method of applying heat to only a portion of the region.

13 is a flowchart showing a method of manufacturing an organic light emitting diode according to the first embodiment.

Referring to FIG. 13, the organic light emitting diode according to the first embodiment attaches the first adhesive layer 130 to the substrate 120. (S201)

The second adhesive layer 140 is attached to the bottom surface of the first adhesive layer 130 attached to the substrate 120. [ (S203)

A concavo-convex pattern 141 is formed on the lower surface of the second adhesive layer 140. (S205)

The concave-convex pattern 141 may be formed by a physical forming method.

The concave-convex pattern 141 may be formed by stamping. That is, the concave-convex pattern 141 may be formed by a method in which a forming plate having a shape corresponding to the concavo-convex pattern 141 is brought into contact with a lower surface of the second adhesive layer 140 to apply pressure.

The uneven pattern 141 may be a roll to roll process in which the forming roller 200 having a shape corresponding to the uneven pattern 141 is pressed against the second adhesive layer 140, As shown in FIG.

Alternatively, the concavo-convex pattern 141 may be formed by a screen printing method in which a material is injected using a screen mask having a shape corresponding to the concavo-convex pattern 141.

Alternatively, the uneven pattern 141 may be formed by a bar coating method in which the coating bar is horizontally moved and a pattern is formed in a specific area.

The concave-convex pattern 141 may be formed by scratching. The concavo-convex pattern 141 may be formed by contacting an object having a hardness stronger than that of the second adhesive layer 140 and then moving the object in one direction.

Alternatively, the concave-convex pattern 141 may be formed by a known chemical method capable of forming a concave-convex pattern.

The second adhesive layer 140 on which the concave-convex pattern 141 is formed can be cured. (S 207)

The second adhesive layer 140 may include a curable material. The curable material may be a photo-curable material, a thermoset material, a chemically-curable material, or a plasma-curable material.

The curing method may be determined depending on the kind of the curable material included in the second adhesive layer 140. That is, the second adhesive layer 140 may be cured by light, heat, chemicals, or plasma.

The second adhesive layer 140 may be cured by UV. In this case, the second adhesive layer 140 can be cured by irradiating UV light in a region adjacent to the lower surface of the second adhesive layer 140. The volume of the cured region may be determined by adjusting the intensity or irradiation time of the UV.

15 is a graph showing the intensity of light according to wavelength of the organic light emitting diode according to the first embodiment. Table 1 shows the luminous efficiency and efficiency increase / decrease ratio of the organic light emitting device according to the first embodiment and the related art.

15 and Table 1 show a state in which the adhesive layer is not applied to the lower part of the substrate in the yellow organic light emitting device according to the YOLED prior art and Comparative Example 1 shows a state in which the yellow adhesive layer 140 having the concave- And the numerical values in parentheses indicate the thickness of the second adhesive layer 140. [ The first embodiment shows a yellow organic light emitting device having a second adhesive layer 140 on which a concavo-convex pattern is formed, and the density represents the density of the concavo-convex pattern. In the case of a low density, an embodiment in which a concave-convex pattern is formed in a partial area (for example, three areas) of the second adhesive layer 140 is shown, and in the case of medium density, An example in which a concavo-convex pattern having a density of four times is formed based on the low density in the case of high density. And an uneven pattern is formed in the entire area of the second adhesive layer 140 in the case of ultra-high density.

division Luminous efficiency [lm / W] Rate of increase / decrease (%) Color coordinates [X, Y] Color temperature [K] One YOLED Conventional technology 30.09 - 0.4329, 0.5584 3959.3 2 Comparative Example 1 (20 占 퐉) 30.68 1.9 0.4328, 0.559 3969.9 3 Comparative Example 2 (60 占 퐉) 30.71 2.0 0.4326, 0.559 3954.0 4 Comparative Example 3 (100 占 퐉) 30.97 2.9 0.4325, 0.5591 3955.8 5 First Embodiment (100 占 퐉 low density) 32.5 8.0 0.4329, 0.5584 3962.6 6 Example 1 (100 占 퐉 medium density) 34.0 12.9 0.4299, 0.5561 3993.9 7 First Embodiment (100 탆 high density) 37.4 24.2 0.4313, 0.5606 3990.2 8 First Embodiment (100 μm_second density) 44.9 49.2 0.4329, 0.5584 3962.6

Referring to Table 1 and FIG. 15, the prior art, the comparative example and the first embodiment have a color temperature and a color coordinate with a small deviation. However, in the case of the light efficiency, the light efficiency is 30.09 lm / W in the case of the conventional art, and the light efficiency is 32.5 lm / W in the case of the low density case. In addition, the first embodiment of medium density has a light efficiency of 34.0 lm / W and increased by 12.9%. The first embodiment of high density has a light efficiency of 37,4% and increased by 24.2%. The first embodiment of ultra-high density has a luminous efficiency of 44.9% and increased by 49.2%.

In addition, the light of the first embodiment at an ultra-high density in the propagation region also has a higher intensity than the prior art and the comparative example.

The first embodiment has color coordinates and color temperature similar to those of the prior art and the comparative example, has a high light efficiency increase rate, reduces power consumption, and has an effect of increasing luminance.

16 is a graph showing the intensity of light according to wavelengths of the organic light emitting diode according to the first to fourth embodiments. Table 2 shows the luminous efficiency and efficiency increase / decrease ratio of the organic light emitting device according to the first to fourth embodiments and the related art.

16 and Table 2 show a state in which the adhesive layer is not applied to the lower part of the substrate in the yellow organic light emitting device and the comparative example shows a state in which the yellow organic light emitting body with the second adhesive layer 140 having no concavo- Device, and the first to fourth embodiments show the organic light emitting element having the above-described structure.

division Luminous efficiency [lm / W] Rate of increase / decrease (%) Color coordinates [X] Color coordinate [Y] Color temperature [K] One YOLED Conventional technology 25 - 0.4351 0.5694 3924 2 YOLED Comparative Example 25 0 0.4431 0.5925 3951.8 3 YOLED Example 1 40 58 0.4355 0.5906 4048 4 YOLED Example 2 41 62 0.4594 0.64 3924 5 YOLED Example 3 36 44 0.4586 0.6289 3879 6 YOLED Example 4 31 24 0.429 0.5683 4037

Referring to Table 2 and FIG. 16, the first to fourth embodiments have a color temperature and a color coordinate with a small deviation in comparison with the prior art and the comparative example. However, in the case of the light efficiency, the light efficiency is 25 lm / W in the case of the conventional art, and the light efficiency is 40 lm / W in the case of the first embodiment, and the light efficiency is increased by 58%. In the case of the second embodiment, the light efficiency was 41 lm / W, and the light efficiency was increased by 62%. The third embodiment has a light efficiency of 36 lm / W and a light efficiency of 44%. The fourth embodiment has a light efficiency of 31 lm / W and a light efficiency of 24%.

However, the organic light emitting element of the first embodiment outputs light having the highest intensity before and after the wavelength region of 550 nm.

The first to fourth embodiments have color coordinates and color temperature similar to those of the prior art and the comparative example, have a high optical efficiency increase rate, reduce power consumption, and increase brightness.

17 is a graph showing the intensities of light for respective wavelengths of the organic light emitting diode according to the first to fourth embodiments. Table 3 shows the luminous efficiency and efficiency increase / decrease ratio of the OLED according to the first to fourth embodiments and the related art.

17 and Table 3 collect data using WOLED. 18 and Table 3, the WOLED prior art shows a state in which the adhesive layer is not applied to the lower part of the substrate in the white organic light emitting device, and the comparative example shows a state in which the white organic light emission with the second adhesive layer 140, Device, and the first to fourth embodiments show a white organic light emitting device having the above-described structure.

division Luminous efficiency [lm / W] Rate of increase / decrease (%) Color coordinates [X] Color coordinate [Y] Color temperature [K]   WOLED_ Conventional technology 34.5 - 0.4832 0.4081 2386   WOLED_ Comparative Example 38.0 10 0.4719 0.3996 2456   WOLED_First Embodiment 63.4 84 0.4613 0.4111 2684   WOLED_ Second Embodiment 58.0 67 0.465 0.413 2648   WOLED_third embodiment 58.0 67 0.4691 0.4101 2572   WOLED_ Fourth Embodiment 49.0 41 0.4696 0.4078 2548

Referring to Table 3 and FIG. 17, the first to fourth embodiments have a color temperature and a color coordinate with a small deviation in comparison with the prior art and the comparative example. However, in the case of the optical efficiency, the optical efficiency was 34.5 lm / W in the case of the conventional art, and 63.4 lm / W in the case of the first embodiment, and the optical efficiency was increased by 84%. In the case of the second embodiment, the light efficiency was 58.0 lm / W, and the light efficiency was increased by 67%. The third embodiment has a light efficiency of 58.0 lm / W and a light efficiency of 67%. The fourth embodiment has a light efficiency of 49.0 lm / W and a light efficiency of 41%.

The first to fourth embodiments output light having a higher intensity than the conventional art and the comparative example in the propagation field.

The first to fourth embodiments have color coordinates and color temperature similar to those of the prior art and the comparative example, have a high optical efficiency increase rate, reduce power consumption, and increase brightness.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be apparent to those skilled in the art that changes or modifications may fall within the scope of the appended claims.

101: Organic light emitting element
110: organic light emitting portion
120: substrate
130: first adhesive layer
140: second adhesive layer

Claims (19)

An organic light emitting portion for emitting light;
A substrate in contact with the organic light emitting portion;
A first adhesive layer having a transparent property to contact the substrate and transmit light generated in the organic light emitting portion, the first adhesive layer having a first surface in contact with the substrate;
And a second adhesive layer having a transparent property to contact the first adhesive layer and transmit the light generated in the organic light emitting portion, wherein the second adhesive layer includes a second surface which is a surface from which light from the organic light emitting portion is emitted to the outside, And -
Wherein the first surface has a surface roughness lower than that of the second surface so as to prevent an air gap between the substrate and the first adhesive layer from being present,
Wherein the second surface has a higher surface roughness than the first surface in order to emit light from the organic light emitting portion to the outside,
Wherein the second surface has a lower adhesive force than the first surface.
The method according to claim 1,
Wherein the surface roughness of the second surface is realized by a concave-convex pattern.
3. The method of claim 2,
Wherein the light emitted from the organic light emitting portion is changed in the light path by the uneven pattern and is output to the outside.
The method of claim 3,
Wherein the uneven pattern has a triangular cross section.
The method according to claim 1,
Wherein the surface roughness of the second surface is realized by light-transmitting beads.
The method according to claim 1,
Wherein the surface roughness of the second surface is realized by a random wrinkle pattern.
The method according to claim 1,
Wherein the first adhesive layer has a refractive index corresponding to the second adhesive layer.
The method according to claim 1,
Wherein the first adhesive layer has a refractive index corresponding to the substrate.
The method according to claim 1,
Wherein the first adhesive layer includes a third surface facing the first surface,
Wherein the second adhesive layer includes a fourth surface facing the second surface,
And the third surface and the fourth surface have a surface roughness corresponding to the first surface.
The method according to claim 1,
Wherein the second adhesive layer has a higher hardness than the first adhesive layer.
The method according to claim 1,
Wherein the second adhesive layer comprises a curable material.
An organic light emitting portion for emitting light;
A substrate in contact with the organic light emitting portion;
A first adhesive layer having a transparent property to contact the substrate and transmit light generated in the organic light emitting portion, the first adhesive layer having a first surface in contact with the substrate;
And a second adhesive layer having a transparent property to contact the first adhesive layer and transmit the light generated in the organic light emitting portion, wherein the second adhesive layer includes a second surface which is a surface from which light from the organic light emitting portion is emitted to the outside, And -
Wherein the first surface has a surface roughness lower than that of the second surface so as to prevent an air gap between the substrate and the first adhesive layer from being present,
Wherein the second surface has a higher surface roughness than the first surface in order to emit light from the organic light emitting portion to the outside,
Wherein the second adhesive layer has a higher hardness than the first adhesive layer.
13. The method of claim 12,
Wherein the second adhesive layer comprises a curable material.
13. The method of claim 12,
Wherein the second adhesive layer comprises light-transmitting beads.
13. The method of claim 12,
And a plurality of scratches are formed on the second surface.
An organic light emitting portion for emitting light;
A substrate in contact with the organic light emitting portion; And
And an adhesive layer having a transparent property to contact the substrate and transmit the light generated in the organic light emitting portion,
Wherein the adhesive layer includes a first region adjacent to the substrate and a second region spaced from the substrate,
Wherein the second region comprises a photo-curable material.
13. The method of claim 12,
Wherein a surface of the adhesive layer adjacent to the substrate has a surface roughness lower than a surface spaced apart from the substrate.
Attaching a first adhesive layer to a substrate on which an organic light emitting portion is formed;
Attaching a second adhesive layer to the first adhesive layer;
Forming an uneven pattern on a surface of the second adhesive layer that is spaced apart from the first adhesive layer; And
And curing the second adhesive layer.
19. The method of claim 18,
Wherein the step of curing the second adhesive layer is a step of curing using UV.

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