KR20080042275A - Organic light-emitting device including uneven layer and lightning apparatus having the same - Google Patents

Abstract

An organic light emitting device including an uneven layer and a lighting apparatus having the same are provided to reduce thickness of the organic light emitting device by having a crystalline layer inside an organic light emitting pattern layer. An organic light emitting device(100) includes a first substrate(110), a first electrode pattern layer(120), an organic light emitting pattern layer(130), a second electrode pattern layer(140), and a second substrate(150). The first electrode pattern layer is formed on the first substrate. The organic light emitting pattern layer is formed on the first electrode pattern layer to emit light when being applied with external voltage. The second electrode pattern layer is formed on the organic light emitting pattern layer. The second substrate is formed on the second electrode pattern layer. An uneven layer(160) is formed on at least one of the first and second substrates.

Description

Organic light-emitting device including an uneven layer and an illumination device having the same {Organic light-emitting device including uneven layer and lightning apparatus having the same}

1 is a cross-sectional view illustrating an organic light emitting diode according to an embodiment of the present invention.

2 is a cross-sectional view showing a state in which an uneven layer is formed on a substrate according to an embodiment of the present invention.

3 is a cross-sectional view showing a state in which an uneven layer is formed on a substrate according to another embodiment of the present invention.

4 is a cross-sectional view illustrating an organic light emitting pattern layer according to an embodiment of the present invention.

5 is a cross-sectional view illustrating an organic light emitting diode according to another exemplary embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic light emitting device, and more particularly, to an organic light emitting device and a lighting device having the same, which are used in various devices to improve the lifetime and display quality of the devices.

In general, as a light source such as a backlight of a liquid crystal display device, a cold cathode fluorescent lamp (CCFL), a light emitting diode (LED), a fluorescent surface light source lamp, an organic light-emitting diode diodes (OLEDs) and the like. OLED light source, which is expected to be the next-generation main light source, can be manufactured by itself as a thin film, which can drastically reduce the thickness of the light source. Furthermore, the size of the light source device can be increased. Recently, various researches for improving the lifespan, brightness, and the like of surface emission using white OLEDs have been conducted.

In particular, research is being actively conducted to use OLED as a next generation lighting device that can replace the existing lighting device.

As such, the OLED may be effectively applied to backlights of LCDs, various lighting devices, display devices, and the like. However, currently developed OLEDs are not yet satisfactory in terms of lifetime, reliability and luminance.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the prior art as described above, and provides an organic light emitting device having excellent reliability and particularly high display performance.

An organic light emitting diode according to an aspect of the present invention is formed on a first substrate, a first electrode pattern layer formed on the first substrate, the first electrode pattern layer, and generates an organic light when a voltage is applied from the outside. A light emitting pattern layer, a second electrode pattern layer formed on the organic light emitting pattern layer, and a second substrate formed on the second electrode pattern layer. An uneven layer is formed on at least one of the first substrate and the second substrate to improve the luminance performance of the organic light emitting device.

The uneven layer includes a uneven portion and a flat portion covering the uneven portion to flatten the uneven layer.

The uneven portion may be formed by protruding a portion by processing the substrate, or may be formed by forming an additional layer made of a different material on the substrate and then performing a process such as etching on the additional layer. The flat portion covers the uneven portion to maintain the uneven layer as a whole. As the flat portion, a transparent polymer resin or the like can be used.

The shape of the unevenness is not particularly limited, and may be, for example, unevenness having a sawtooth-shaped cross section.

The organic light emitting pattern layer may include at least one organic crystalline layer formed by crystallization of an organic material.

The surface lighting apparatus according to an aspect of the present invention includes at least one organic light emitting device. The organic light emitting diode is formed on a first substrate, a first electrode pattern layer formed on the first substrate, the first electrode pattern layer, and an organic light emitting pattern layer that generates light when a voltage is applied from the outside. A second electrode pattern layer formed on the light emitting pattern layer, and a second substrate formed on the second electrode pattern layer. An uneven layer is formed on at least one of the first substrate and the second substrate, thereby improving the luminance performance of the organic light emitting device, thereby improving the display quality of the lighting device.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view illustrating an organic light emitting diode according to an embodiment of the present invention.

Referring to FIG. 1, the organic light emitting diode 100 may include a first substrate 110, a first electrode pattern layer 120, an organic emission pattern layer 130, a second electrode pattern layer 140, and a second substrate ( 150). In addition, an uneven layer for improving luminance is formed on the second substrate 150.

The first substrate 110 may be a transparent substrate or an opaque substrate. In order to use the organic light emitting diode 100, the first substrate 110 and the second substrate 150 should be both transparent substrates. Meanwhile, the first substrate 110 may be made of a flexible material having flexibility. For example, the first substrate 110 is made of a transparent glass substrate. In the present embodiment, the first substrate 110 is made of soda lime glass. The soda lime glass is preferably used to form a protective film in order to prevent yellowing caused by sodium elution. Alternatively, borosilicate glass may be used. In this embodiment, the first substrate has a thickness of 0.5 to 1.1 mm.

The first electrode pattern layer 120 is formed by depositing or applying a metal material for a positive electrode. In the present embodiment, the first electrode pattern layer 120 is formed of an opaque metal material. For example, the first electrode pattern layer 120 is formed of calcium (Ca), barium (Ba), magnesium (Mg), silver (Ag), copper (Cu), aluminum (Al), or an alloy thereof. .

The first electrode pattern layer 120 may be patterned in various forms according to the purpose of the organic light emitting device 100. For example, when used as a backlight of a general lighting device or a liquid crystal display device may be formed in a single pattern. In contrast, when used as an organic light emitting diode display, the organic light emitting diode is patterned into a matrix to correspond to the plurality of pixels. In this case, the organic light emitting materials forming the organic light emitting pattern layer 130 corresponding to each pixel may vary. The first electrode pattern layer 120 may be made of a transparent conductor such as indium tin oxide (ITO) or indium zinc oxide (IZO). For example, when double-sided light emission is required, both the first electrode pattern layer 120 and the second electrode pattern layer 140 should be transparent electrodes.

The uneven layer 160 is formed on the second substrate 150. The uneven layer 160 promotes diffusion of light generated from the organic light emitting pattern layer, thereby improving brightness characteristics of the organic light emitting device 100.

2 is a cross-sectional view showing a state in which an uneven layer is formed on a substrate according to an embodiment of the present invention.

Referring to FIG. 2, the uneven layer 260 includes a uneven portion 262 and a flat portion 264 covering the uneven portion 262 to flatten the uneven layer 260 as a whole.

In the present embodiment, the uneven portion 262 is formed by processing the surface of the second substrate 250, and corresponds to the protrusion portion protruding from the second substrate 250.

The flat portion 264 is formed by applying and curing a transparent polymer resin on the uneven portion 262. That is, the flat portion 264 is made of a transparent polymer resin. For example, polyethylene terephthalate (PET) resin or the like can be used.

The uneven layer 260 is formed by the flat portion 264 is a flat film as a whole, but the shape of the uneven portion 262 is still maintained inside the uneven layer 260, the uneven portion 262 The optical function by can be effectively exerted.

3 is a cross-sectional view showing a state in which an uneven layer is formed on a substrate according to another embodiment of the present invention.

Referring to FIG. 3, the uneven layer 360 according to the present exemplary embodiment includes an uneven portion 362 and a flat portion 364.

Unlike the concave-convex portion 262 of FIG. 2, the concave-convex portion 362 is not a protruding portion protruding from the second substrate 350, but after the additional layer is formed on the second substrate 350, the additional layer is formed. It is formed by processing. The additional layer is not particularly limited as long as it is a transparent material. In the present embodiment, a transparent polymer resin is used as the additional layer.

The uneven portion 362 is formed to have a predetermined shape by processing the additional layer in accordance with the properties of the material.

Since the flat part 364 is as described above, duplicated descriptions will be omitted. However, when the additional layer is formed using the polymer resin, the polymer resin constituting the additional layer and the polymer resin constituting the flat part 362 should be different from each other. This is because only this can maximize the improvement of the optical characteristics using the refractive index difference.

In the above, only a process of forming a concave-convex by processing a predetermined layer will be described otherwise, concave-convex formation by a variety of methods will be possible, and those skilled in the art can easily be applied to the present invention and other various concave-convex formation method will be.

 4 is a cross-sectional view illustrating an organic light emitting pattern layer according to an embodiment of the present invention.

Referring to FIG. 4, at least one layer of the organic light emitting pattern layer 430 includes an organic crystal layer formed by crystallization. The organic crystal layer may be crystallized by heat treating an organic material layer having an amorphous structure or by irradiating light having a specific range of energy.

In particular, the organic material layer to be crystallized is preferably a layer in contact with the first electrode pattern layer (hereinafter, 120 of FIG. 1). When the first electrode pattern layer is an inorganic material layer and the organic material layer is crystalline, an interfacial property may be improved and light emission characteristics may be improved. In addition, the thickness of the organic light emitting device may be reduced by reducing the thickness during the crystallization process.

The organic emission pattern layer 430 includes a hole transport layer 432, an organic emission layer 434, and an electron transport layer 436.

The hole transport layer 432, the organic light emitting layer 434, and the electron transport layer 436 may be sequentially laminated on the first electrode pattern layer. Each of the organic layers 432, 434, and 436 is sequentially formed on the first electrode pattern layer by an organic deposition method, a spin coating method, a spray spray method, or the like.

The hole transport layer 432 is a layer in contact with the first electrode pattern layer, which is an inorganic layer, and an interface property between the first electrode pattern layer and the hole transport layer directly affects the luminous efficiency of the organic light emitting device.

In this case, the hole transport layer 432 is composed of a crystalline layer formed by crystallization of the organic material for hole transport. In addition, in the crystallizing of the hole transporting organic material to form the hole transporting layer 432, the hole transporting layer may be uniformly applied by adding a fine rotation process. 432 may be uniformly formed on the first electrode pattern layer. Therefore, the organic light emitting device has excellent flatness of an interface formed between the hole transport layer 432 and the first electrode pattern layer. In addition, the hole transport layer 432 is made of crystalline to excellent adhesion between the first electrode pattern layer of the inorganic material not only to reduce the contact resistance but also to improve hole mobility (hole mobility) light emission of the organic light emitting device It can increase efficiency and lifespan.

The organic light emitting pattern layer 430 may include various additional layers such as a hole blocking layer and an electron injection layer in addition to the hole transport layer 434, the organic light emitting layer 434, and the electron transport layer 436. have. In addition, since the layers 432, 434, and 436 include various phosphors, lifespan and reliability of the organic light emitting pattern layer 430 may be improved.

In the above description, only the hole transport layer 432 is mainly described as including a crystalline layer, but any layer may be crystallized as long as the organic material layer is in contact with the inorganic material layer as well as the hole transport layer. Further, if desired, a crystalline layer may be formed regardless of the contact relationship between the layers.

The organic light emitting pattern layer 430 may form a single pattern made of the same organic light emitting materials, or may be formed of a plurality of patterns expressing different heterogeneous colors. When the colors are different, the organic materials forming the organic light emitting pattern layer are different from each other.

Referring back to FIG. 1, a second electrode pattern layer 140 is formed on the organic light emitting pattern layer 130. The second electrode pattern layer 140 may be made of a transparent conductor such as indium tin oxide (ITO) or indium zinc oxide (IZO). The second electrode pattern layer 140 may have various patterns. However, in the present embodiment, the second electrode pattern layer 140 has a single unitary pattern as a common electrode.

The first electrode pattern layer 120 and the second electrode pattern layer 140 are organic light emitting pattern layer 130 between the first electrode pattern layer 120 and the second electrode pattern layer 140 when power is supplied. To form an electric field. The organic light emitting pattern layer 130 generates light when an electric field is applied.

The organic light emitting device has a single pattern and may function as a white light source. Therefore, it can function as a surface light source device of a general lighting device or a liquid crystal display device. In addition, since the thickness of the organic light emitting pattern layer 130 is reduced during the crystallization process, an organic light emitting device having a slimmer design can be manufactured.

Therefore, the organic light emitting device according to the present embodiment is excellent in processability and can be applied to lighting fixtures having various shapes.

Although not shown, the organic light emitting diode may have a polygonal shape such as a triangle, a pentagon, and a star when viewed on a plane. In addition, when viewed on a planar surface, at least one surface may have a curved shape or the like.

The organic light emitting device may be efficiently applied to a nighttime billboard due to ease of shape processing as well as a general lighting fixture.

5 is a cross-sectional view illustrating an organic light emitting diode according to another exemplary embodiment of the present invention.

Since the organic light emitting device according to the present embodiment is the same as the organic light emitting device of FIG. 1 except that the organic light emitting device further includes an uneven layer on the first substrate, a description overlapping with the description of FIG. 1 will be omitted.

Referring to FIG. 5, the organic light emitting diode according to the present exemplary embodiment may include a first substrate 510, a first uneven layer 520, a first electrode pattern layer 530, an organic light emitting pattern layer 540, and a second electrode pattern. Layer 550, a second substrate 560, and a second uneven layer 570.

The organic light emitting diode according to the present exemplary embodiment is a double-sided light emitting diode, and the first electrode pattern layer 530 and the second electrode pattern layer 550 are both transparent electrodes. In addition, both the first substrate 510 and the second substrate 560 are also made of a substrate made of a transparent material.

In the present embodiment, the first uneven layer 520 and the second uneven layer 570 both include the same directionality of the uneven layer.

Alternatively, the first uneven layer 520 and the second uneven layer 570 may be symmetric with each other based on the organic light emitting pattern layer 550.

That is, the first uneven layer 520 is not inserted between the first substrate 510 and the first electrode pattern layer 530 so as to be symmetrical with the second uneven layer 570, and the first uneven layer 520 is symmetrical with the second uneven layer 570. It may be formed on an outer surface of the substrate 510.

As such, the first uneven layer 520 and the second uneven layer 570 may be variously disposed in consideration of required properties or functions of an application device.

The present invention also provides a lighting device comprising the organic light emitting device. The organic light emitting diode may be applied to be included in at least one lighting device, thereby improving lifespan, reliability, and display quality of the lighting device.

The organic light emitting device may be applied to lighting devices having various shapes, but in particular, the organic light emitting device may maximize its performance.

The organic light emitting device according to the present invention includes an uneven layer to increase the luminance of light generated from the organic light emitting pattern layer, thereby improving display quality of the organic light emitting device.

In addition, the organic light emitting diode may include a crystalline layer in the organic light emitting pattern layer, thereby reducing the thickness of the organic light emitting diode.

In particular, by forming an organic layer in contact with the electrode layer as a crystalline layer, the adhesion to the electrode layer can be improved, thereby reducing the contact resistance generated between the electrode layer and the organic light emitting device. Can improve the service life and reliability.

In addition, when the hole transport layer is formed of a crystalline layer in the organic light emitting pattern, hole mobility is increased to increase the luminous efficiency of the organic EL device.

In addition, the interface flatness between the layers constituting the organic light emitting pattern layer is excellent to prevent the inflow of foreign matters from the outside and further improve the optical properties.

In addition, the organic light emitting device is reduced in thickness as mentioned above, it is excellent in the thin film properties and processability, it is possible to manufacture a lighting device or a billboard in a variety of shapes.

 Although described with reference to the above embodiments, those skilled in the art will understand that various modifications and changes can be made without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

Claims (13)

A first substrate; A first electrode pattern layer formed on the first substrate; An organic light emitting pattern layer formed on the first electrode pattern layer and generating light when a voltage is applied from the outside; A second electrode pattern layer formed on the organic light emitting pattern layer; And A second substrate formed on the second electrode pattern layer, An uneven layer is formed on at least one of the first substrate and the second substrate. The method of claim 1, The uneven layer includes an uneven portion and a flat portion covering the uneven portion to flatten the uneven layer. The method of claim 2, The uneven portion is formed by processing the substrate surface, and an organic light emitting device, characterized in that consisting of a plurality of protrusions protruding from the surface of the substrate. The method of claim 2, The uneven part is an organic light emitting device, characterized in that made of a first transparent polymer film having uneven surface formed. The method of claim 2, The flat part is an organic light emitting device, characterized in that the second transparent polymer film formed to cover the uneven portion. The method of claim 2, The uneven portion and the flat portion of the organic light emitting device, characterized in that made of different materials. The method of claim 1, The first electrode pattern and the second electrode pattern are transparent electrode patterns, and a first uneven layer and a second uneven layer are formed on the first substrate and the second substrate, respectively. The method of claim 2, The uneven portion has a sawtooth-shaped cross section, characterized in that the organic light emitting device. The method of claim 1, And the organic light emitting pattern layer comprises at least one organic crystalline layer formed by crystallization of an organic material. The method of claim 9, And the organic crystalline layer is a layer in contact with the first electrode pattern layer. The organic light emitting device of claim 1, wherein the organic light emitting pattern layer comprises a hole transporting layer, an organic light emitting layer, and an electron transporting layer formed by being sequentially stacked on the first electrode pattern layer, respectively. The method of claim 10, The hole transport layer is an organic light emitting device, characterized in that consisting of a crystalline layer formed by crystallizing the organic material for hole transport. A first substrate; A first electrode pattern layer formed on the first substrate; An organic light emitting pattern layer formed on the first electrode pattern layer and generating light when a voltage is applied from the outside; A second electrode pattern layer formed on the organic light emitting pattern layer; And A second substrate formed on the second electrode pattern layer, Lighting device provided with at least one organic light emitting element, characterized in that the uneven layer is formed on at least one of the first substrate and the second substrate.

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