KR20180071789A - Lighting apparatus using organic light emitting diode and method of fabricating thereof - Google Patents

Abstract

The present invention relates to a lighting device using an organic light emitting diode and a manufacturing method thereof, which form a protective layer of a wrinkle (or uneven) structure on the upper part of an auxiliary electrode and forms a low refractive flattening layer thereon. Light loss is reduced through refractive index matching and light generated from an organic light emitting diode is focused through the wrinkle structure, thereby improving brightness reduction due to the auxiliary electrode. The lighting device using an organic light emitting diode comprises: the auxiliary electrode and a first electrode provided on a substrate; a first protective layer provided to cover the auxiliary electrode on the upper part of the auxiliary electrode, and having the wrinkle (or uneven) structure on the surface; an organic light emitting layer and a second electrode provided on a lighting part of the substrate in which the first protective layer is provided; and a metal film provided on the lighting part of the substrate.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an illumination device using an organic light-

The present invention relates to a lighting apparatus, and more particularly, to a lighting apparatus using an organic light emitting element and a method of manufacturing the same.

Currently, fluorescent or incandescent lamps are mainly used as lighting devices. Among these, incandescent lamps have a good color rendering index (CRI) but have a low energy efficiency. Fluorescent lamps have high efficiency, but have low color rendering index and mercury.

The color rendering index is an index representing color reproduction. The color rendering index is compared with a case where a feeling of a color of an object illuminated by a light source is illuminated by a specific light source and a case where it is illuminated by a reference light source. It is an index. The CRI of sunlight is 100.

In order to solve the problem of such a conventional illumination device, a light emitting diode (LED) has recently been proposed as a lighting device. The light emitting diode is composed of an inorganic light emitting material and has the highest luminous efficiency at the blue wavelength band and the luminous efficiency is lowered toward the green wavelength band having the highest red and visibility. Therefore, when white light is emitted by combining a red light emitting diode, a green light emitting diode, and a blue light emitting diode, the emission efficiency is low.

As another alternative, an illumination device using an organic light emitting diode (OLED) is being developed. In an illumination device using a general organic light emitting device, an anode electrode made of ITO is formed on a glass substrate. Then, an organic light emitting layer and a cathode electrode are formed, and a protective layer and a lamination film are formed thereon.

Organic light emitting devices are divided into a fluorescent and a phosphorescent type according to a light emitting type. Since the fluorescent organic light emitting device can use only 25% of the recombined excitons for light emission, the internal quantum efficiency is 25%. Further, since the phosphorescent organic light emitting device can be used for all the excitons formed by the recombination, the internal quantum efficiency can theoretically be up to 100%. However, the efficiency and lifetime characteristics of the blue phosphorescent organic light emitting device are limited. Therefore, a hybrid structure in which blue is used as a fluorescent organic light emitting element and green and red are used as a phosphorescent organic light emitting element are used.

In addition, even when the internal quantum efficiency of 100% is obtained by using the phosphorescent organic light emitting device, the external quantum efficiency is only about 20% due to the difference in refractive index between the organic light emitting devices constituting each layer. Accordingly, to solve this problem, an internal light extraction layer is introduced between the substrate and the anode electrode to improve external quantum efficiency, or a resonance structure is introduced to improve light extraction in the organic light emitting layer to improve light extraction. In addition, an additional structure such as introduction of an external light extraction layer such as a microlens is required between the substrate and the air layer.

1 is a cross-sectional view illustrating an illumination device using a general organic light emitting device.

Referring to FIG. 1, an illumination device 10 using a general organic light emitting device includes an organic light emitting device part 1 for emitting light and a sealing part 2 for sealing the organic light emitting device part 1.

The organic light emitting diode unit 1 includes an organic light emitting diode (OLED) disposed on the substrate 10.

That is, the first electrode 16 and the second electrode 26 are disposed on the substrate 10, and the organic light emitting layer 30 is disposed between the first electrode 16 and the second electrode 26, Thereby forming a device. A pressure sensitive adhesive 18 is applied to the upper part of the organic light emitting device, and a metal film 70 is disposed thereon to seal the lighting device 10.

In this case, the illumination device 10 using a general organic light emitting device is further provided with an external light extraction layer 45 for increasing the haze under the organic light emitting device part 1.

The illumination device 10 using a general organic light emitting device further includes an internal light extracting layer 40 between the substrate 10 and the organic light emitting device to improve external quantum efficiency.

In order to improve the external quantum efficiency, the illumination device 10 using the general organic light emitting device requires a further configuration, which is a factor that complicates manufacturing costs and processes.

In addition, since the illumination device 10 using general organic light emitting devices has about 10% of the auxiliary electrode made of copper having a reflectance of about 0.7, the luminance reduction by the auxiliary electrode may be a problem.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an illumination device using an organic light emitting element which is capable of removing a light extraction layer by luminance improvement and a manufacturing method thereof.

Other objects and features of the present invention will be described in the following description of the invention and the claims.

According to an aspect of the present invention, there is provided an illumination device using an organic light emitting diode, comprising: an auxiliary electrode and a first electrode provided on a substrate; A light emitting layer, a second electrode, and a metal film provided on the illumination portion of the substrate.

In this case, the first passivation layer according to an embodiment of the present invention is provided to cover the auxiliary electrode above the auxiliary electrode, and has a wrinkle (or concavo-convex) structure on its surface.

The substrate may be divided into the illumination unit and the first and second contact units, and the first and second contact units may be located outside the illumination unit.

And a planarization layer provided on the first passivation layer.

At this time, the planarization layer may be made of an insulating material having a lower refractive index than the first protective layer.

The first electrode may extend to the first contact portion to constitute a first contact electrode and may further include a second contact electrode provided in the illumination portion and the second contact portion in the same layer as the first electrode, .

The first passivation layer may be formed of siloxane.

According to another aspect of the present invention, there is provided a method of manufacturing an illumination device using an organic light emitting diode, the method including forming an auxiliary electrode and a first electrode on a substrate, forming an auxiliary electrode over the auxiliary electrode, Forming a first protective layer having a wrinkle (or concavo-convex) structure on the substrate, forming an organic light-emitting layer and a second electrode on the illumination portion of the substrate on which the first protective layer is formed, And attaching the film.

The forming of the first passivation layer may include forming a siloxane film by coating a siloxane on the substrate having the auxiliary electrode and the first electrode, firstly curing the substrate having the siloxane film formed thereon, And secondarily curing the primary cured siloxane film to form a wrinkled (or concavo-convex) structure on the surface.

At this time, the siloxane film may be hardened through the primary curing such that the siloxane film has different degree of curing depending on the depth.

At this time, the primary and lower primary cured siloxane films can be hardened harder than the primary cured siloxane films at the center.

At this time, out-gas escapes through the primary cured siloxane film in the central portion near the upper primary cured siloxane film through the secondary curing, and at the same time, the difference in curing degree of the primary cured siloxane films The surface can be shrunk, and wrinkles can be generated on the surface.

And forming a planarization layer on the first passivation layer.

At this time, the planarization layer may be formed of an insulating material having a lower refractive index than the first protective layer.

As described above, the illumination device using the organic light emitting diode according to an embodiment of the present invention and the method of fabricating the same reduce light loss through refractive index matching, while collecting light generated from the organic light emitting device through the wrinkle structure, Thereby reducing the luminance of the display device.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view exemplarily showing a lighting device using a general organic light emitting device. FIG.
2 is a cross-sectional view illustrating, by way of example, a lighting device using an organic light emitting diode according to an embodiment of the present invention.
3 is a plan view schematically showing a lighting device using an organic light emitting diode according to an embodiment of the present invention.
4 is a schematic cross-sectional view taken along line I-I 'of the lighting device using the organic light emitting diode according to the embodiment of the present invention shown in FIG. 3;
5A to 5E are plan views sequentially illustrating a method of manufacturing an illumination device using an organic light emitting diode according to an embodiment of the present invention shown in FIG.
FIG. 6 is an enlarged view of a part of the illumination part shown in FIG. 5B; FIG.
7A to 7F are sectional views sequentially illustrating a method of manufacturing an illumination device using an organic light emitting diode according to an embodiment of the present invention shown in FIG.
8A to 8D are cross-sectional views illustrating a method of forming a lower first protective layer in a method of manufacturing an illumination device using an organic light emitting diode according to an embodiment of the present invention.
9 shows a structural formula showing methyl silsesquioxane.
10 shows an example of a curing reaction of methyl silsesquioxane.

Hereinafter, preferred embodiments of the illumination device using the organic light emitting diode according to the present invention and the method of manufacturing the same will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention .

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification. The dimensions and relative sizes of the layers and regions in the figures may be exaggerated for clarity of illustration.

It will be understood that when an element or layer is referred to as being another element or "on" or "on ", it includes both intervening layers or other elements in the middle, do. On the other hand, when a device is referred to as "directly on" or "directly above ", it does not intervene another device or layer in the middle.

The terms spatially relative, "below," "lower," "above," "upper," and the like, And may be used to easily describe the correlation with other elements or components. Spatially relative terms should be understood to include, in addition to the directions shown in the drawings, terms that include the different directions of the elements in use, or in operation. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element. Thus, the exemplary term "below" can include both downward and upward directions.

The terminology used herein is for the purpose of describing embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprise "and / or" comprising ", as used in the specification, means that the presence of stated elements, Or additions.

2 is a cross-sectional view illustrating an exemplary lighting device using an organic light emitting diode according to an exemplary embodiment of the present invention.

3 is a plan view schematically illustrating a lighting apparatus using an organic light emitting diode according to an embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view taken along the line I-I 'of the illuminating device using the organic light emitting diode according to the embodiment of the present invention shown in FIG.

The present invention provides an illumination device using an organic light emitting device made of an organic material rather than an illumination device using an inorganic light emitting device made of an inorganic material.

An organic light emitting device made of an organic light emitting material has a relatively good luminous efficiency of green and red as compared with an inorganic light emitting device. In addition, since the width of the emission peak of red, green, and blue is relatively larger than that of the inorganic light emitting device, the color rendering index of the organic light emitting device is improved and the light of the light emitting device is more similar to the sunlight.

In the following description, the illuminating device of the present invention is described as a flexible illuminating device with ductility, but it may be applied not only to the bent illuminating device of the present invention but also to a general illuminating device that does not bend.

2 to 4, an illumination device 100 using an organic light emitting device according to an embodiment of the present invention includes an organic light emitting device part 101 in which surface emission is performed, (102). ≪ / RTI >

The illuminating device 100 using the organic light emitting diode according to the embodiment of the present invention is different from the illuminating self-illuminating device using the existing organic light emitting device in that an external light extracting layer is not provided under the organic light emitting device part 101 .

The organic light emitting device unit 101 is formed of an organic light emitting device provided on the substrate 110 and further includes no internal light extracting layer between the substrate 110 and the organic light emitting device.

As described above, the illumination device 100 using the organic light emitting diode according to the exemplary embodiment of the present invention does not further include inner and outer light extraction layers for improving external quantum efficiency. As will be described later in detail, in the embodiment of the present invention, the lower first protective layer 115a 'having a wrinkle (or concavo-convex) structure is formed on the auxiliary electrode 111 to condense light generated from the organic light emitting element This is because the luminance reduction by the auxiliary electrode 111 can be improved.

At this time, the substrate 110 includes an illumination unit EA for emitting actual light and outputting the light to outside, contact units CA1 and CA2 for electrically connecting to the outside through the contact electrodes 127 and 128 and applying a signal to the illumination unit EA, CA2).

The contact portions CA1 and CA2 are not covered by the sealing means of the metal film 170 and can be electrically connected to the outside through the contact electrodes 127 and 128. [ Therefore, the metal film 170 may be attached to the entire surface of the illumination portion EA of the substrate 110 except for the contact portions CA1 and CA2.

At this time, the contact portions CA1 and CA2 may be located outside the illumination portion EA, and FIG. 2 illustrates that the second contact portion CA2 is located between the first contact portions CA1 , But the present invention is not limited thereto.

3 illustrates that the contact portions CA1 and CA2 are located only on one side of the illuminating portion EA. However, the present invention is not limited thereto. Therefore, the contact portions CA1 and CA2 of the present invention may be located both above and below the illumination portion EA.

A first electrode 116 and a second electrode 126 are disposed on the substrate 110 and an organic light emitting layer 130 is disposed between the first electrode 116 and the second electrode 126, . In the illumination device 100 having such a structure, as a signal is applied to the first electrode 116 and the second electrode 126 of the organic light emitting device, the organic light emitting layer 130 emits light, thereby outputting light through the illumination unit EA .

The organic light emitting layer 130 may be a light emitting layer that outputs white light. For example, the organic light emitting layer 130 may include a blue light emitting layer, a red light emitting layer, and a green light emitting layer, or may have a tandem structure including a blue light emitting layer and a yellow-green light emitting layer. However, the organic light emitting layer 130 of the present invention is not limited to the above-described structure, and various structures may be applied.

The organic light emitting layer 130 of the present invention includes an electron injection layer and a hole injection layer for injecting electrons and holes respectively into the light emitting layer, an electron transport layer and a hole transport layer for transporting the injected electrons and holes to the light emitting layer, Lt; RTI ID = 0.0 > a < / RTI > charge generating layer.

At this time, the first protective layer 115a, the organic light emitting layer 130, and the second electrode 126 are not formed on the contact portions CA1 and CA2 outside the illumination portion EA, Lt; / RTI > The second passivation layer 115b and the third passivation layer 115c are formed to cover the organic light emitting layer 130 and the second electrode 126 of the illumination unit EA, Thereby preventing water from penetrating into the first chamber 130.

Generally, the polymer constituting the organic luminescent material deteriorates rapidly when luminescent material is combined with moisture, and the luminescent efficiency of the organic luminescent layer 130 is lowered. Particularly, when a part of the organic light emitting layer 130 is exposed to the outside in the illumination apparatus 100, moisture is propagated into the illumination apparatus 100 along the organic light emitting layer 130 to lower the light emitting efficiency of the illumination apparatus 100 . In the case of the present invention, the second protective layer 115b and the third protective layer 115c are formed to cover the organic light emitting layer 130 and the second electrode 126 of the illumination unit EA, Thereby preventing moisture from penetrating into the organic light emitting layer 130 of the illuminating unit EA of the outputted illumination device 100. [ Therefore, the yield is improved, the manufacturing cost is reduced, and the reliability is secured.

At this time, the first electrode 116 including the first contact electrode 127 and the second contact electrode 128 are disposed on the substrate 110 made of a transparent material. As the substrate 110, a hard material such as glass can be used, but it becomes possible to manufacture the lighting device 100 which can be bent by using a material having flexibility such as plastic. In addition, in the present invention, by using plastic material having ductility as the substrate 110, it becomes possible to perform a process using a roll, thereby making it possible to manufacture the lighting apparatus 100 quickly.

The first electrode 116 and the second contact electrode 128 including the first contact electrode 127 are formed on the illumination unit EA and the first and second contact units CA1 and CA2, May be formed of a transparent conductive material having a work function. For example, in the present invention, a tin oxide-based conductive material of indium tin oxide (ITO) or indium zinc oxide (IZO) is used for the first electrode 116 and the second contact electrode 128 including the first contact electrode 127, ), Or a transparent conductive polymer may be used.

The first electrode 116 extends to the first contact CA1 outside the illumination unit EA and constitutes the first contact electrode 127. A part of the illumination unit EA and the second contact CA2 A second contact electrode 128 electrically insulated from the first electrode 116 may be disposed. That is, the second contact electrode 128 is disposed in the same layer as the first electrode 116, and can be electrically isolated from the first electrode 116.

For example, in FIG. 3, the first electrode 116 including the first contact electrode 127 is formed in a rectangular shape as a whole, the upper center portion is removed to form a recession, And the contact electrode 128 are disposed on the substrate. However, the present invention is not limited thereto.

The auxiliary electrode 111 may be disposed on the illumination unit EA and the first contact CA1 of the substrate 110 to be electrically connected to the first electrode 116 and the first contact electrode 127. [ The first electrode 116 has the advantage of transmitting light emitted by being formed of a transparent conductive material. However, the first electrode 116 has a disadvantage that the electrical resistance is very high as compared with the opaque metal. Therefore, when the large-area lighting apparatus 100 is manufactured, the distribution of the current applied to the wide lighting area becomes uneven due to the large resistance of the transparent conductive material, and this non- Thereby making it impossible to emit light having a uniform luminance of.

The auxiliary electrode 111 is arranged in the form of a thin-walled matrix, a mesh, a hexagon, an octagon, a circle, or the like throughout the entire illuminating section EA, So that the large-area lighting apparatus 100 can emit light having a uniform luminance.

4, the auxiliary electrode 111 is disposed below the first electrode 116 including the first contact electrode 127. However, the present invention is not limited thereto, and the auxiliary electrode 111 May be disposed on the first electrode 116 including the first contact electrode 127. The auxiliary electrode 111 disposed on the first contact CA1 is used as a path for transferring the current to the first electrode 116 through the first contact electrode 127, But also serves as a contact electrode to be applied to the electrode 116.

The auxiliary electrode 111 may be made of a conductive metal such as Al, Au, Cu, Ti, W, Mo, or an alloy thereof. Although not shown, the auxiliary electrode 111 may have a two-layer structure of an upper auxiliary electrode and a lower auxiliary electrode. However, the present invention is not limited thereto and may be a single layer.

The auxiliary electrode 111 serves to apply a uniform current to the first electrode 116 of the entire illumination unit EA. The auxiliary electrode 111 is made of a metal having a high reflectivity (~0.7) And the luminance is reduced by reflection due to the ratio of about 10% of the total. Accordingly, in the illumination device 100 using the organic light emitting diode according to the embodiment of the present invention, the lower first protective layer 115a 'having a corrugated (or concave) structure is formed on the auxiliary electrode 111 as described above And the light generated from the organic light emitting device is condensed. In addition, an upper first protective layer 115a 'of low refractive index is formed on the lower first protective layer 115a' to match the refractive index.

That is, the first protective layer 115a may be laminated on the illumination portion EA of the substrate 110. [ In FIG. 3, the first passivation layer 115a is shown as a rectangular frame having a predetermined width. In practice, the first passivation layer 115a is formed in the light emitting region so as to cover the auxiliary electrode 111, . ≪ / RTI > However, the present invention is not limited thereto.

The first protective layer 115a disposed in the illumination unit EA is configured to cover the auxiliary electrode 111 and the first electrode 112 thereon. Particularly, the first protective layer 115a of the illumination unit EA is formed so as to surround the auxiliary electrode 111 to reduce the stepped portion by the auxiliary electrode 111, so that the various layers to be formed thereafter are formed stably can do.

The first passivation layer 115a may be made of an inorganic material such as SiOx or SiNx. However, the first protective layer 115a may be composed of an organic material such as photoacryl, or may be composed of a plurality of layers of an inorganic material and an organic material.

In particular, the first passivation layer 115a according to an embodiment of the present invention includes a lower first protective layer 115a 'having a relatively high refractive index wrinkle (or concavo-convex) structure, The present invention is not limited to this, and the first protective layer 115a of the present invention may be formed of a lower first protective layer 115 having a corrugated (or concavo- 115a '.

The lower first protective layer 115a 'may be composed of a siloxane such as methyl silsesquioxane. When the lower first protective layer 115a 'is composed of siloxane, the solution process can be applied, and the cost can be reduced.

The upper first protective layer 115a '' is made of an insulating material having a relatively low refractive index as compared with the lower first protective layer 115a ', thereby flattening the surface of the substrate 110.

As such, the lower first protective layer 115a 'and the upper first protective layer 115a " can reduce optical loss through refractive index matching.

The lower first protective layer 115a 'has a wrinkle (or concavo-convex) structure on its surface to diffuse light generated in the organic light emitting layer 130 or light reflected to the inside through the auxiliary electrode 111, (See arrows in Fig. 4). Thus, the high-luminance illumination device 100 can be manufactured, and the inner and outer light extraction layers can be removed by improving the luminance.

The organic light emitting layer 130 and the second electrode 126 may be disposed on the substrate 110 on which the first electrode 112 and the first passivation layer 115a are disposed. The first passivation layer 115a on the second contact electrode 128 located at the illumination unit EA may have a contact hole 114 through which a predetermined region is removed to expose the second contact electrode 128 have. Accordingly, the second electrode 126 can be electrically connected to the second contact electrode 128 located below the contact hole 114 through the contact hole 114.

As described above, the organic light emitting layer 130 may be a white organic light emitting layer, and may be composed of a red light emitting layer, a blue light emitting layer and a green light emitting layer, or a tandem structure including a blue light emitting layer and a yellow-green light emitting layer. The organic light emitting layer 130 includes an electron injection layer and a hole injection layer for injecting electrons and holes respectively into the light emitting layer, an electron transport layer and a hole transport layer for transporting the injected electrons and holes to the light emitting layer, And a charge generation layer for generating a charge generation layer.

The second electrode 126 may be made of a metal such as Al, Mo, Cu, Ag, or an alloy such as MoTi.

The first electrode 116 of the illumination unit EA and the organic light emitting layer 130 and the second electrode 126 constitute an organic light emitting device. When the first electrode 116 is an anode of an organic light emitting diode and the second electrode 126 is a cathode and current is applied to the first electrode 116 and the second electrode 126, Electrons are injected from the second electrode 126 into the organic light emitting layer 130 and holes are injected from the first electrode 116 into the organic light emitting layer 130. Excitons are generated in the organic light emitting layer 130. As the excitons are decayed, light corresponding to the energy difference between LUMO (Lowest Unoccupied Molecular Orbital) and HOMO (Highest Occupied Molecular Orbital) And diverges in a downward direction (toward the substrate 110 in the drawing).

At this time, since the first passivation layer 115a is disposed above the auxiliary electrode 111 of the illumination unit EA, the organic light emitting layer 130 on the auxiliary electrode 111 does not directly contact the first electrode 116 An organic light emitting diode is not formed on the auxiliary electrode 111. That is, the organic light emitting element in the illumination portion EA is formed only in the light emitting region in the auxiliary electrode 111 in the form of a matrix, for example.

The second protective layer 115b and the third protective layer 115c may be formed on the substrate 110 on which the second electrode 126 is formed.

The second passivation layer 115b according to the embodiment of the present invention is formed to cover the organic light emitting layer 130 and the second electrode 126 of the illumination unit EA as described above, And can prevent water from penetrating into the light emitting layer 130.

That is, in the case of the present invention, the second protective layer 115b and the third protective layer 115c, in addition to the sealing means of the adhesive 118 and the metal film 170, It is possible to prevent water from penetrating into the organic light emitting layer 130 of the illumination unit EA of the illumination device 100 in which the actual light is emitted and output.

The second passivation layer 115b may be formed of an organic material such as photoacryl. In addition, the third passivation layer 115c may be formed of an inorganic material such as SiOx or SiNx. However, the present invention is not limited thereto.

A predetermined encapsulant may be provided on the third passivation layer 115c. As the encapsulant, an epoxy compound, an acrylate compound, an acrylic compound, or the like may be used.

The first contact electrode 127 extending from the first electrode 116 is exposed to the outside on the substrate 110 of the first contact CA1. The second contact electrode 128 electrically connected to the second electrode 126 is exposed to the outside through the contact hole 114 in the substrate 110 of the second contact CA2. Therefore, the first contact electrode 127 and the second contact electrode 128 are electrically connected to an external power source to apply a current to the first electrode 116 and the second electrode 126, respectively.

A pressure sensitive adhesive 118 such as PSA (Pressure Sensitive Adhesive) is applied on the third protective layer 115c and a metal film 170 is disposed thereon. The metal film 170 is attached to the third protective layer 115c Thereby sealing the lighting apparatus 100. [

At this time, the sealing means of the adhesive 118 and the metal film 170 may be attached so as to sufficiently cover the second protective layer 115b and the third protective layer 115c.

The pressure-sensitive adhesive 118 may be a photo-curable pressure-sensitive adhesive or a thermosetting pressure-sensitive adhesive.

Hereinafter, a method of manufacturing an illumination device using an organic light emitting diode according to an embodiment of the present invention will be described in detail with reference to the drawings.

5A to 5E are plan views sequentially illustrating a method of manufacturing an illumination device using an organic light emitting diode according to an embodiment of the present invention shown in FIG.

FIG. 6 is an enlarged view showing a part of the illumination unit shown in FIG. 5B.

7A to 7F are cross-sectional views sequentially illustrating a method of manufacturing the illumination device using the organic light emitting diode according to the embodiment of the present invention shown in FIG.

5A and 7A, a metal such as Al, Au, Cu, Ti, W, Mo, or an alloy thereof is deposited and etched on the substrate 110 divided into the illumination part and the contact part, An auxiliary electrode 111 made of a single layer or a plurality of layers is formed.

At this time, although not shown, the auxiliary electrode 111 may have a two-layer structure of an upper auxiliary electrode and a lower auxiliary electrode.

At this time, the auxiliary electrode 111 may be arranged in a thin matrix (see FIG. 6), a mesh shape, a hexagonal or an octagonal shape, or a circular shape over the entire illumination portion.

Thereafter, a transparent conductive material such as ITO or IZO is deposited on the entire surface of the substrate 110 and etched to form the first electrode 116 including the first contact electrode 127 and the first electrode 116 on the first and second contact portions, 2 contact electrodes 128 are formed.

In this case, the first electrode 116 extends to the first contact portion outside the illumination portion to constitute the first contact electrode 127, and a part of the illumination portion and the second contact portion are electrically connected to the first electrode 116, A contact electrode 128 may be formed. In other words, the second contact electrode 128 is formed in the same layer as the first electrode 116, and can be electrically isolated from the first electrode 116.

For example, FIG. 5A illustrates a structure in which the first electrode 116 including the first contact electrode 127 is formed in a rectangular shape as a whole, the upper center portion is removed to form the recess, and the second contact electrode 128) are formed by way of example, but the present invention is not limited thereto.

5A and 7A illustrate that the auxiliary electrode 111 is formed under the first electrode 116 including the first contact electrode 127. However, the present invention is not limited thereto, The electrode 111 may be formed on the first electrode 116 including the first contact electrode 127. The auxiliary electrode 111 disposed in the first contact portion is used as a path for transmitting current to the first electrode 116 but also serves as a contact electrode for applying external current to the first electrode 116 can do.

5B and 7B, an inorganic material such as SiNx or SiOx or an organic material such as photo-acryl is laminated on a part of the illumination part of the substrate 110. [ Thereafter, a contact hole 114 is formed by etching the inorganic material or the organic material to form a first passivation layer 115a on the upper and the side of the auxiliary electrode 111 of the illumination unit and exposing a part of the second contact electrode 128 .

At this time, the first passivation layer 115a is formed to cover the auxiliary electrode 111 and the first electrode 112 thereon, but the first passivation layer 115a is not formed in the light emitting region where the actual light is emitted 6, the first protective layer 115a may be formed in a matrix form so as to cover the auxiliary electrode 111 arranged in a matrix form in the light emitting region). In particular, the first passivation layer 115a is formed so as to surround the auxiliary electrode 111 to reduce the stepped portion by the auxiliary electrode 111, so that various layers to be formed thereafter can be stably formed without being broken. 5B, the first passivation layer 115a is formed in a rectangular frame shape having a predetermined width. However, as described above, the auxiliary electrode 111, in which the first passivation layer 115a is disposed in a matrix form, As shown in FIG. 5B illustrates an example in which the first protective layer 115a on the first electrode 112 and the first protective layer 115a on the second contact electrode 128 are separated from each other However, the present invention is not limited thereto.

In particular, as described above, the first passivation layer 115a according to the embodiment of the present invention includes a first upper passivation layer 115a 'as a planarization layer on the lower first passivation layer 115a' having a corrugated (or concavo- The present invention is not limited thereto, and the first protective layer 115a of the present invention may be formed in a double-layered structure in which the lower first protective layer 115a ' ) May be formed.

The lower first protective layer 115a 'may be formed of a siloxane such as methyl silsesquioxane.

The upper first protective layer 115a "may be formed of an insulating material having a lower refractive index than the lower first protective layer 115a '.

The lower first protective layer 115a 'and the upper first protective layer 115a " formed as described above can reduce light loss through refractive index matching.

In addition, the lower first protective layer 115a 'has a wrinkle (or concavo-convex) structure on its surface to diffuse the light generated in the organic light emitting layer or the light reflected inside through the auxiliary electrode 111, .

Hereinafter, an example in which a lower first protective layer 115a 'having a wrinkled (or concavo-convex) structure is formed using methyl silsesquioxane will be described in detail with reference to the drawings.

8A to 8D are cross-sectional views illustrating a method of forming a lower first protection layer in a method of manufacturing an illumination device using an organic light emitting diode according to an embodiment of the present invention.

9 is a structural formula showing methyl silsesquioxane.

10 is a structural formula showing an example of the curing reaction of methyl silsesquioxane.

Referring to FIG. 8A, a siloxane film 115 is formed by coating a siloxane on a substrate 110.

At this time, the siloxane film 115 may be formed by adding a predetermined additive in addition to the siloxane.

In this case, SOG (Spin-on Glass) can be used, and SOG is a process of spin-coating glass melted with an organic solvent and forming a SiO ₂ insulating film by heat treatment.

For reference, siloxanes are collectively referred to as compounds containing silicon, oxygen, and hydrogen among compounds containing Si-O bonds (siloxane bonds).

At this time, methylsilsesquioxane shown in FIG. 9 can be used as an example of the siloxane.

Methyl silsesquioxane has a CH ₃ group attached to the Si-O chain.

8B, the substrate 110 on which the siloxane film 115 is formed is cured at a temperature of about 240 DEG C or lower.

At this time, when the siloxane coated on the substrate 115 is cured at a temperature of 240 ° C or lower, variation (or difference) in degree of curing occurs between depths of the siloxane. That is, more and more energy is injected into the upper and lower siloxanes compared to the siloxane in the middle, resulting in more curing. Therefore, the primary cured siloxane film 115 "in the upper and lower portions is cured harder than the primary cured siloxane film 115 'in the central portion.

8C and 8D, the primary cured siloxane films 115 'and 115' 'are subjected to secondary curing at a temperature of about 250 ° C or higher in a vacuum state to form a secondary cured siloxane film 115a .

At this time, the out-gas 140 such as moisture (H ₂ O) escapes from the first cured siloxane film 115 'in the center near the first cured siloxane film 115 " The surface shrinkage due to the difference in degree of curing of the cured siloxane films 115 'and 115 "causes wrinkles on the surface of the secondary cured siloxane film 115a.

For example, referring to FIG. 10, a liquid siloxane containing an organic system and an alcohol system generates Si-O bonds while curing the -OH group into moisture. That is, a SiOx-based film having a dense inorganic film property is formed.

At this time, the degree of wrinkling according to the curing temperature of the secondary hardened siloxane film 115a can be controlled by changing the additive.

5C, 5D and 7C to 7E, an organic light emitting layer 130, an organic light emitting layer 130, and a second electrode 126 are formed in the illumination portion of the substrate 110, And the second protective layer 115b, respectively.

First, referring to FIGS. 5C and 7C, an organic light emitting layer 130 made of an organic light emitting material is formed in an illumination portion of a substrate 110. FIG.

At this time, the organic light emitting layer 130 may be a white organic light emitting layer composed of a red light emitting layer, a blue light emitting layer and a green light emitting layer, or a tandem structure including a blue light emitting layer and a yellow-green light emitting layer. The organic light emitting layer 130 includes an electron injection layer and a hole injection layer for injecting electrons and holes respectively into the light emitting layer, an electron transport layer and a hole transport layer for transporting the injected electrons and holes to the light emitting layer, And a charge generation layer for generating a charge generation layer.

Next, referring to FIGS. 5D and 7D, a second electrode 126 made of a metal is formed in the illumination portion of the substrate 110 so as to cover the organic light emitting layer 130. FIG.

At this time, the second electrode 126 can be electrically connected to the second contact electrode 128 under the contact hole 114.

The second electrode 126 may be formed of a metal such as Al, Mo, Cu, Ag, or an alloy such as MoTi.

The first electrode 116 of the illumination unit and the organic light emitting layer 130 and the second electrode 126 constitute an organic light emitting device.

Since the first passivation layer 115a is disposed on the auxiliary electrode 111 of the illumination unit, the organic emission layer 130 on the auxiliary electrode 111 does not directly contact the first electrode 116, 111), an organic light emitting device is not formed. That is, the organic light emitting element in the illumination portion is formed only in the light emitting region partitioned by the auxiliary electrode 111 in the form of a matrix, for example (see FIG. 6).

7E, a second passivation layer 115b made of an organic material is formed in the illumination portion of the substrate 110 so as to cover the organic emission layer 130 and the second electrode 126. Next, as shown in FIG.

That is, the second passivation layer 115b is formed so as to cover the organic light emitting layer 130 and the second electrode 126 of the illumination unit and prevents moisture from penetrating into the organic light emitting layer 130 of the illumination unit can do.

The organic light emitting layer 130, the second electrode 126, and the second passivation layer 115b may be formed in-line through the roll-manufacturing apparatus, but the present invention is not limited thereto.

Next, a third passivation layer 115c is formed on the illumination portion of the substrate 110 so as to cover the second passivation layer 115b.

The third protective layer 115c may be formed through another roll-making apparatus.

The third passivation layer 115c may be formed of an inorganic material such as SiOx or SiNx. However, the present invention is not limited thereto.

A predetermined encapsulant may be further provided on the third passivation layer 115c. The encapsulant may be an epoxy compound, an acrylate compound, an acrylic compound, or the like.

Next, referring to FIGS. 5E and 7F, an adhesive 118 made of a photo-curing adhesive material or a thermosetting adhesive material is applied on the illuminating portion of the substrate 110. [ After the metal film 170 is placed thereon, the adhesive agent 118 is cured to attach the metal film 170, thereby completing the lighting device.

At this time, the first and second contact portions are not covered by the sealing means of the metal film 170, and can be electrically connected to the outside through the first and second contact electrodes 127 and 128.

While a great many are described in the foregoing description, it should be construed as an example of preferred embodiments rather than limiting the scope of the invention. Therefore, the invention should not be construed as limited to the embodiments described, but should be determined by equivalents to the appended claims and the claims.

100: illumination device 110: substrate
115a, 115a ', 115a': first protective layer 115b: second protective layer
115c: third protective layer 116: first electrode
126: second electrode 127: first contact electrode
128: second contact electrode 130: organic light emitting layer
170: metal film

Claims (13)

An auxiliary electrode and a first electrode provided on a substrate;
A first passivation layer provided on the auxiliary electrode to cover the auxiliary electrode and having a wrinkle (or concavo-convex) structure on the surface thereof;
An organic light emitting layer and a second electrode provided on an illumination portion of the substrate having the first passivation layer; And
And a metal film provided on the illumination part of the substrate. [2] The apparatus of claim 1, wherein the substrate is divided into the illumination unit and the first and second contact units,
Wherein the first and second contact portions are located outside the illumination portion. The illumination device of claim 1, further comprising a planarization layer disposed on the first passivation layer. The illumination device of claim 3, wherein the planarization layer is made of an insulating material having a lower refractive index than the first passivation layer. 3. The display device according to claim 2, wherein the first electrode extends to the first contact portion to form a first contact electrode,
Wherein the illumination unit further comprises a second contact electrode disposed in the same layer as the first electrode, the second contact electrode being provided in the illumination unit and the second contact unit. The illumination device of claim 1, wherein the first passivation layer comprises a siloxane. Forming an auxiliary electrode and a first electrode on the substrate;
Forming a first passivation layer on the surface of the auxiliary electrode to cover the auxiliary electrode and having a wrinkle (or concavo-convex) structure on the surface thereof;
Forming an organic light emitting layer and a second electrode on the illumination portion of the substrate on which the first protective layer is formed; And
And attaching a metal film to the illumination portion of the substrate through the adhesive. 8. The method of claim 7, wherein forming the first passivation layer comprises:
Forming a siloxane film by coating a siloxane on the substrate having the auxiliary electrode and the first electrode;
Firstly curing the substrate on which the siloxane film is formed; And
And curing the primary cured siloxane film to form a wrinkled (or concavo-convex) structure on the surface. The method according to claim 8, wherein the siloxane film is cured so that the siloxane film has different degrees of hardening through the primary curing. The manufacturing method of an illuminating device according to claim 9, wherein the primary cured siloxane film in the upper and lower portions is cured harder than the primary cured siloxane film in the central portion. 11. The method of claim 10, wherein outgassing escapes through the primary cured siloxane film in the central portion near the upper primary cured siloxane film through the secondary curing, Wherein the surface is shrunk due to a difference in degree of curing, and wrinkles are generated on the surface. The method according to claim 7, further comprising forming a planarization layer on the first passivation layer. 14. The method of claim 13, wherein the planarizing layer is formed of an insulating material having a lower refractive index than the first passivation layer.

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