KR102661550B1 - Lighting apparatus using organic light emitting diode and method of fabricating thereof - Google Patents

Abstract

The lighting device using the organic light emitting device of the present invention and its manufacturing method are characterized by forming a protective layer with a wrinkle (or uneven) structure on the upper part of the auxiliary electrode and forming a low-refractive flattening layer on it. .
The present invention reduces light loss through refractive index matching and at the same time provides the effect of improving luminance reduction caused by the auxiliary electrode by concentrating light generated from the organic light emitting device through the wrinkle structure.

Description

Lighting device using organic light emitting elements and manufacturing method thereof {LIGHTING APPARATUS USING ORGANIC LIGHT EMITTING DIODE AND METHOD OF FABRICATING THEREOF}

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

Currently, lighting devices mainly use fluorescent or incandescent lights. Among these, incandescent lamps have a good color rendering index (CRI), but have the disadvantage of very low energy efficiency, and fluorescent lamps have good efficiency, but have a low color rendering index and contain mercury, which poses environmental problems.

The color rendering index is an index that indicates color reproduction, and indicates the degree to which the color of an object illuminated by a light source is similar when compared to when it is illuminated by a specific light source and when it is illuminated by a standard light source. It is an exponent. The CRI of solar power is 100.

To solve these problems with conventional lighting devices, light emitting diodes (LEDs) have recently been proposed as lighting devices. Light-emitting diodes are made of inorganic light-emitting materials, and their luminous efficiency is highest in the blue wavelength band, and luminous efficiency decreases toward red and the green wavelength band, which is the color with the highest visibility. Therefore, when white light is emitted by combining red light emitting diodes, green light emitting diodes, and blue light emitting diodes, there is a disadvantage in that light emission efficiency is lowered.

As another alternative, lighting devices using Organic Light Emitting Diode (OLED) are being developed. In a lighting device using a typical 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 fluorescence and phosphorescence types depending on the light emission method. Fluorescent organic light emitting devices have an internal quantum efficiency of 25% because only 25% of recombined excitons can be used for light emission. In addition, since phosphorescent organic light-emitting devices can utilize all excitons formed by recombination for light emission, internal quantum efficiency can theoretically be up to 100%. However, there are limits to the efficiency and lifespan characteristics of blue phosphorescent organic light emitting devices. Therefore, a hybrid structure is used in which blue is composed of fluorescent organic light-emitting devices and green and red are composed of phosphorescent organic light-emitting devices.

In addition, even if an internal quantum efficiency of 100% is obtained using a 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 that make up each layer. Therefore, in order to solve this problem and improve external quantum efficiency, an internal light extraction layer is introduced between the substrate and the anode electrode, or a resonance structure is introduced to improve light extraction by improving resonance within the organic light-emitting layer. In addition, additional configurations such as the introduction of an external light extraction layer such as a micro lens are required between the substrate and the air layer.

Figure 1 is a cross-sectional view exemplarily showing a lighting device using a general organic light emitting device.

Referring to FIG. 1, a lighting device 10 using a general organic light emitting device is composed of an organic light emitting device portion 1 that emits surface light and an encapsulation portion 2 that seals the organic light emitting device portion 1.

The organic light emitting device unit 1 is composed of an organic light emitting device provided on a substrate 10.

That is, the first electrode 16 and the second electrode 26 are disposed on the top of the substrate 10, and the organic light-emitting layer 30 is disposed between the first electrode 16 and the second electrode 26 to emit organic light. Forms an element. Then, an adhesive 18 is applied to the top of the organic light emitting device, and a metal film 70 is placed on it to seal the lighting device 10.

At this time, the lighting device 10 using a general organic light emitting device is additionally provided with an external light extraction layer 45 to increase haze at the bottom of the organic light emitting device portion 1.

In addition, the lighting device 10 using a general organic light emitting device is additionally provided with an internal light extraction layer 40 between the substrate 10 and the organic light emitting device to improve external quantum efficiency.

As such, the lighting device 10 using a general organic light emitting device requires additional configuration to improve external quantum efficiency, which is a factor that complicates the manufacturing cost and process.

In addition, since the lighting device 10 using a general organic light emitting device is provided with auxiliary electrodes made of copper with a reflectance of about 0.7 at a rate of about 10%, a decrease in luminance due to the auxiliary electrodes may be a problem.

The present invention is intended to solve the above-described problems, and its purpose is to provide a lighting device using an organic light-emitting device that removes the light extraction layer by improving luminance and a method of manufacturing the same.

Other purposes and features of the present invention will be explained in the configuration and claims described later.

In order to achieve the above object, a lighting device using an organic light emitting device according to an embodiment of the present invention is an organic lighting device provided in the lighting part of the substrate provided with an auxiliary electrode, a first electrode, and a first protective layer. It may be comprised of a light emitting layer, a second electrode, and a metal film provided on the lighting part of the substrate.

At this time, the first protective layer according to an embodiment of the present invention is provided on top of the auxiliary electrode to cover the auxiliary electrode, and is characterized by having a wrinkle (or uneven) structure on the surface.

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

It may additionally include a planarization layer provided on the first protective layer.

At this time, the planarization layer may be made of an insulating material with a relatively low refractive index compared to the first protective layer.

The first electrode extends to the first contact part to form a first contact electrode, and may further include a second contact electrode provided in the lighting part and the second contact part in the same layer as the first electrode. .

The first protective layer may be made of siloxane.

In addition, a method of manufacturing a lighting device using an organic light emitting device according to an embodiment of the present invention includes forming an auxiliary electrode and a first electrode on a substrate, forming an auxiliary electrode on top of the auxiliary electrode to cover the auxiliary electrode, and forming an auxiliary electrode on the surface. forming a first protective layer having a wrinkled (or uneven) structure; forming an organic light-emitting layer and a second electrode on the lighting part of the substrate on which the first protective layer is formed; and applying metal to the lighting part of the substrate through an adhesive. It may include the step of attaching a film.

At this time, forming the first protective layer includes forming a siloxane film by coating siloxane on the substrate on which the auxiliary electrode and the first electrode are formed, primary curing the substrate on which the siloxane film is formed, and It may include the step of secondary curing the primary cured siloxane film to form a wrinkled (or uneven) structure on the surface.

At this time, through the primary curing, the siloxane film can be cured to have different degrees of curing depending on the depth.

At this time, the primary cured siloxane film on the upper and lower parts can be cured more firmly (solidly) than the primary cured siloxane film on the central part.

At this time, through the secondary curing, out-gas escapes from the primary cured siloxane film in the central portion near the upper primary cured siloxane film, and at the same time, the difference in curing degree of the primary cured siloxane films This may cause the surface to shrink, creating wrinkles on the surface.

It may further include forming a planarization layer on the first protective layer.

At this time, the planarization layer may be formed of an insulating material with a relatively low refractive index compared to the first protective layer.

As described above, the lighting device using an organic light-emitting device according to an embodiment of the present invention and its manufacturing method reduce light loss through refractive index matching while concentrating light generated from the organic light-emitting device through a wrinkle structure to form an auxiliary electrode. Provides the effect of improving luminance reduction caused by.

Figure 1 is a cross-sectional view illustrating a lighting device using a general organic light emitting device.
Figure 2 is a cross-sectional view exemplarily showing a lighting device using an organic light-emitting device according to an embodiment of the present invention.
Figure 3 is a plan view schematically showing a lighting device using an organic light emitting device according to an embodiment of the present invention.
FIG. 4 is a diagram schematically showing a cross section along line II' of a lighting device using an organic light emitting device according to an embodiment of the present invention shown in FIG. 3.
Figures 5A to 5E are plan views sequentially showing a method of manufacturing a lighting device using an organic light emitting device according to an embodiment of the present invention shown in Figure 3.
Figure 6 is an enlarged view showing a portion of the lighting unit shown in Figure 5b.
FIGS. 7A to 7F are cross-sectional views sequentially showing a method of manufacturing a lighting device using an organic light emitting device according to an embodiment of the present invention shown in FIG. 4.
8A to 8D are cross-sectional views exemplarily showing a method of forming a lower first protective layer in the method of manufacturing a lighting device using an organic light-emitting device according to an embodiment of the present invention.
Figure 9 shows the structural formula of methylsilsesquioxane.
Figure 10 is a structural formula illustrating the curing reaction of methylsilsesquioxane.

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

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms. The present embodiments only serve to ensure that the disclosure of the present invention is complete and are within the scope of common knowledge in the technical field to which the present invention pertains. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification. The sizes and relative sizes of layers and regions in the drawings may be exaggerated for clarity of explanation.

When an element or layer is referred to as another element or “on” or “on” it includes not only those directly on top of another element or layer, but also all cases where there is another layer or element in between. do. On the other hand, referring to an element as “directly on” or “directly on” indicates that there is no intervening element or layer.

Spatially relative terms such as “below, beneath,” “lower,” “above,” and “upper” refer to one element or component as shown in the drawing. It can be used to easily describe the correlation with other elements or components. Spatially relative terms should be understood as terms that include different directions of the element during use or operation in addition to the direction shown in the drawings. For example, if an element shown in the drawings is turned over, an element described as “below” or “beneath” another element may be placed “above” the other element. Accordingly, the illustrative term “down” may include both downward and upward directions.

The terminology used herein is for the purpose of describing embodiments and is therefore not intended to limit the invention. As used herein, singular forms also include plural forms, unless specifically stated otherwise in the context. As used in the specification, “comprise” and/or “comprising” refers to the presence of one or more other components, steps, operations and/or elements. or does not rule out addition.

Figure 2 is a cross-sectional view exemplarily showing a lighting device using an organic light-emitting device according to an embodiment of the present invention.

Figure 3 is a plan view schematically showing a lighting device using an organic light emitting device according to an embodiment of the present invention.

And, FIG. 4 is a diagram schematically showing a cross section along line II' of a lighting device using an organic light emitting device according to an embodiment of the present invention shown in FIG. 3.

The present invention provides a lighting device using an organic light-emitting device made of an organic material, rather than a lighting device using an inorganic light-emitting device made of an inorganic material.

Organic light-emitting devices made of organic light-emitting materials have relatively good green and red luminous efficiency compared to inorganic light-emitting devices. In addition, since organic light-emitting devices have relatively wider red, green, and blue emission peak widths compared to inorganic light-emitting devices, the color rendering index is improved, which has the advantage of making the light of the light-emitting device more similar to sunlight.

In the following description, the lighting device of the present invention is described as a flexible, bendable lighting device, but the present invention can be applied not only to the flexible lighting device, but also to general lighting devices that are not bent.

Referring to Figures 2 to 4, the lighting device 100 using an organic light emitting device according to an embodiment of the present invention includes an organic light emitting device portion 101 that emits surface light and a bag sealing the organic light emitting device portion 101. It may be configured to include a unit 102.

At this time, the lighting device 100 using an organic light-emitting device according to an embodiment of the present invention, unlike the existing lighting device using an organic light-emitting device, does not have an external light extraction layer below the organic light-emitting device portion 101. It is characterized by

The organic light emitting device portion 101 is made of an organic light emitting device provided on a substrate 110, and is characterized by not having an additional internal light extraction layer between the substrate 110 and the organic light emitting device.

As such, the lighting device 100 using an organic light emitting device according to an embodiment of the present invention is characterized by not having additional internal and external light extraction layers to improve external quantum efficiency, unlike the existing one. As will be described in detail later, in the case of the embodiment of the present invention, the lower first protective layer 115a' with a wrinkle (or uneven) structure is formed on the upper part of the auxiliary electrode 111 to condense the light generated from the organic light emitting device. This is because the decrease in luminance caused by the auxiliary electrode 111 can be improved.

At this time, the substrate 110 has a lighting unit (EA) that actually emits light and outputs it to the outside, and a contact unit (CA1, It can be configured including CA2).

The contact portions CA1 and CA2 are not covered by the encapsulation means of the metal film 170 and can be electrically connected to the outside through the contact electrodes 127 and 128. Accordingly, the metal film 170 may be attached to the entire surface of the lighting portion EA of the substrate 110 excluding the contact portions CA1 and CA2.

At this time, the contact units CA1 and CA2 may be located outside the lighting unit EA, and FIG. 2 shows as an example that the second contact unit CA2 is located between the first contact units CA1. , the present invention is not limited thereto.

In addition, FIG. 3 shows an example in which the contact units CA1 and CA2 are located only outside the lighting unit EA, but the present invention is not limited thereto. Accordingly, the contact units CA1 and CA2 of the present invention may be located both above and below the outside of the lighting unit 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 to provide an organic light-emitting device. can be formed. In the lighting device 100 having this structure, when 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 and outputs light through the lighting unit EA. .

The organic light-emitting layer 130 may be composed of a light-emitting layer that outputs white light. As an example, the organic light-emitting layer 130 may be composed of a blue light-emitting layer, a red light-emitting layer, and a green light-emitting layer, or may be composed of 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.

In addition, the organic light-emitting layer 130 of the present invention includes an electron injection layer and a hole injection layer that respectively inject electrons and holes into the light-emitting layer, an electron transport layer and a hole transport layer that transport the injected electrons and holes to the light-emitting layer, respectively, and It may further include a charge generation layer that generates charges such as.

At this time, the first protective layer 115a, the organic light emitting layer 130, and the second electrode 126 are not formed in the contact parts CA1 and CA2 outside the lighting part EA, so the contact electrodes 127 and 128 are externally exposed. may be exposed. At this time, the second protective layer 115b and the third protective layer 115c, which is an encapsulation layer, are formed to cover the organic light-emitting layer 130 and the second electrode 126 of the lighting unit EA, thereby forming the organic light-emitting layer 115c of the lighting unit EA. (130) It serves to prevent moisture from penetrating.

In general, when the polymer constituting the organic light-emitting material combines with moisture, the light-emitting characteristics rapidly deteriorate, and the light-emitting efficiency of the organic light-emitting layer 130 decreases. In particular, when a portion of the organic light-emitting layer 130 in the lighting device 100 is exposed to the outside, moisture propagates into the lighting device 100 along the organic light-emitting layer 130, reducing the luminous efficiency of the lighting device 100. It will be done. Accordingly, 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 lighting unit EA, so that actual light is emitted. It prevents moisture from penetrating into the organic light-emitting layer 130 of the lighting unit (EA) of the output lighting device 100. Therefore, yield is improved, manufacturing cost is reduced, and 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. A hard material such as glass can be used as the substrate 110, but by using a flexible material such as plastic, it is possible to manufacture the bendable lighting device 100. In addition, in the present invention, by using a flexible plastic material as the substrate 110, a process using a roll is possible, making it possible to quickly manufacture the lighting device 100.

The first electrode 116 and the second contact electrode 128, including the first contact electrode 127, are formed on the lighting part EA and the first and second contact parts CA1 and CA2, and have good conductivity and high It can be formed of a transparent conductive material with a work function. As an example, in the present invention, the first electrode 116 and the second contact electrode 128, including the first contact electrode 127, are made of a tin oxide-based conductive material such as ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide). ) can be made of zinc oxide-based conductive materials, etc., and transparent conductive polymers can also be used.

At this time, the first electrode 116 extends to the first contact part CA1 outside the lighting part EA to form the first contact electrode 127, and a part of the lighting part EA and the second contact part CA2 include A second contact electrode 128 may be disposed to be electrically insulated from the first electrode 116. That is, the second contact electrode 128 may be disposed on the same layer as the first electrode 116, but may be separated from and electrically insulated from the first electrode 116.

As an example, Figure 3 shows that the first electrode 116 including the first contact electrode 127 has an overall rectangular shape, but the upper central portion is removed to form a recession, and the second electrode 116 is formed in the recession. Although the contact electrode 128 is shown as an example, the present invention is not limited thereto.

An auxiliary electrode 111 may be disposed on the lighting part EA and the first contact part CA1 of the substrate 110 and electrically connected to the first electrode 116 and the first contact electrode 127. The first electrode 116 is made of a transparent conductive material and has the advantage of transmitting emitted light, but has the disadvantage of having a very high electrical resistance compared to an opaque metal. Therefore, when manufacturing a large-area lighting device 100, the distribution of current applied to a large lighting area becomes uneven due to the large resistance of the transparent conductive material, and this uneven current distribution causes the large-area lighting device 100 It makes it impossible to emit light with uniform brightness.

The auxiliary electrode 111 is arranged in a thin matrix shape, mesh shape, hexagonal or octagonal shape, or circular shape throughout the lighting unit (EA) to provide a uniform current to the first electrode 116 throughout the lighting unit (EA). is applied to enable light emission of uniform brightness in the large-area lighting device 100.

In Figure 4, the auxiliary electrode 111 is shown as an example disposed below the first electrode 116 including the first contact electrode 127, but the present invention is not limited thereto, and the auxiliary electrode 111 ) may be disposed on the top of the first electrode 116 including the first contact electrode 127. The auxiliary electrode 111 disposed in the first contact portion CA1 is used as a transmission path for current to the first electrode 116 through the first contact electrode 127, but is in contact with the outside and transmits the external current to the first contact electrode 127. It can also serve as a contact electrode applied to the electrode 116.

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

In this way, the auxiliary electrode 111 serves to ensure that a uniform current is applied to the first electrode 116 of the entire lighting unit (EA), but is made of a metal with a high reflectivity (~ 0.7) such as copper and is used in the lighting unit (EA). As it is provided at a rate of about 10% of the total, luminance is reduced due to reflection. Therefore, the lighting device 100 using an organic light emitting device according to an embodiment of the present invention includes a lower first protective layer 115a' having a wrinkled (or uneven) structure on the auxiliary electrode 111 as described above. It is characterized by forming and concentrating light generated from the organic light emitting device. In addition, a low-index upper first protective layer 115a" 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 lighting portion EA of the substrate 110. In FIG. 3, the first protective layer 115a is shown as a rectangular frame shape with an overall width, but in reality, the first protective layer 115a is a matrix in the light emitting area to cover the auxiliary electrodes 111 arranged in a matrix form. It can be formed into a shape. However, the present invention is not limited to this.

The first protective layer 115a disposed on the lighting unit EA is configured to cover the auxiliary electrode 111 and the first electrode 112 above it. In particular, the first protective layer 115a of the lighting unit EA is formed to surround the auxiliary electrode 111 to reduce the step caused by the auxiliary electrode 111, so that various layers formed thereafter are formed stably without disconnection. can do.

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

In particular, the first protective layer 115a according to an embodiment of the present invention includes a lower first protective layer 115a' having a wrinkled (or uneven) structure of relatively high refractive index and an upper first protective layer 115a' of a relatively low refractive index flattening layer. It is characterized by being composed of a protective layer (115a"). However, the present invention is not limited to this, and the first protective layer (115a) of the present invention is a lower first protective layer (or uneven) structure ( It may also consist of only 115a').

The lower first protective layer 115a' may be made of siloxane such as methyl silsesquioxane. When the lower first protective layer 115a' is made of siloxane, a solution process can be applied, thereby reducing costs.

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

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

In addition, the lower first protective layer 115a' has a wrinkled (or uneven) structure on the surface to diffusely reflect light generated within the organic light-emitting layer 130 or light reflected internally through the auxiliary electrode 111. can be concentrated (see arrow in FIG. 4). Accordingly, a high-brightness lighting device 100 can be manufactured, and the internal and external light extraction layers can be removed by improving the brightness.

Additionally, 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 protective layer 115a are disposed. At this time, the first protective layer 115a on the second contact electrode 128 located in the lighting unit EA may be provided with a contact hole 114 through which a predetermined area is removed to expose the second contact electrode 128. there is. Accordingly, the second electrode 126 can be electrically connected to the second contact electrode 128 below it through the contact hole 114.

As described above, the organic light-emitting layer 130 is 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 may be composed of a tandem structure including a blue light-emitting layer and a yellow-green light-emitting layer. In addition, the organic light-emitting layer 130 includes an electron injection layer and a hole injection layer that respectively inject electrons and holes into the light-emitting layer, an electron transport layer and a hole transport layer that respectively transport the injected electrons and holes to the light-emitting layer, and charges such as electrons and holes. It may include a charge generation layer that generates.

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

The first electrode 116, the organic light emitting layer 130, and the second electrode 126 of the lighting unit EA constitute an organic light emitting device. At this time, the first electrode 116 is the anode of the organic light emitting device and the second electrode 126 is the cathode, and when current is applied to the first electrode 116 and the second electrode 126, Electrons are injected into the organic light-emitting layer 130 from the second electrode 126, and holes are injected into the organic light-emitting layer 130 from the first electrode 116. Afterwards, excitons are generated within the organic light-emitting layer 130, and as these excitons decay, light corresponding to the energy difference between LUMO (Lowest Unoccupied Molecular Orbital) and HOMO (Highest Occupied Molecular Orbital) of the light-emitting layer is generated. This is generated and radiates downward (toward the substrate 110 in the drawing).

At this time, since the first protective layer 115a is disposed on the auxiliary electrode 111 of the lighting unit EA, the organic light-emitting layer 130 on the auxiliary electrode 111 is not in direct contact with the first electrode 116. No organic light emitting element is formed on the auxiliary electrode 111. That is, for example, the organic light emitting element in the lighting unit EA is formed only in the light emitting area within the auxiliary electrode 111, which has a matrix shape.

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

At this time, the second protective layer 115b according to an embodiment of the present invention is formed to cover the organic light-emitting layer 130 and the second electrode 126 of the lighting unit EA, as described above, thereby protecting the organic light emitting layer 115b of the lighting unit EA. It may serve to prevent moisture from penetrating into the light emitting layer 130.

That is, in the case of the present invention, in addition to the sealing means of the adhesive 118 and the metal film 170, the second protective layer 115b and the third protective layer 115c are connected to the organic light emitting layer 130 of the lighting unit EA and the second protective layer 115c. By forming the electrode 126 to cover it, it is possible to prevent moisture from penetrating into the organic light-emitting layer 130 of the lighting unit EA of the lighting device 100, where actual light is emitted and output.

The second protective layer 115b may be made of an organic material such as photoacrylic. Additionally, the third protective layer 115c may be made of an inorganic material such as SiOx or SiNx. However, the present invention is not limited to this.

A predetermined encapsulant may be provided on the third protective layer 115c, and such encapsulant may be an epoxy-based compound, an acrylate-based compound, or an acrylic-based compound.

As described above, the first contact electrode 127 extending from the first electrode 116 is exposed to the outside on the substrate 110 of the first contact portion CA1. Additionally, a second contact electrode 128 electrically connected to the second electrode 126 through a contact hole 114 is exposed to the outside of the substrate 110 of the second contact portion CA2. Accordingly, the first contact electrode 127 and the second contact electrode 128 are electrically connected to an external power source, and current is applied to the first electrode 116 and the second electrode 126, respectively.

An adhesive 118 such as PSA (Pressure Sensitive Adhesive) is applied on the third protective layer 115c, and a metal film 170 is placed on it, so that the metal film 170 is attached to the third protective layer 115c. This seals the lighting device 100.

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

The adhesive 118 may be a photocurable adhesive or a thermosetting adhesive.

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

Figures 5A to 5E are plan views sequentially showing a method of manufacturing a lighting device using an organic light emitting device according to an embodiment of the present invention shown in Figure 3.

Figure 6 is an enlarged view showing a portion of the lighting unit shown in Figure 5b.

7A to 7F are cross-sectional views sequentially showing a method of manufacturing a lighting device using an organic light-emitting device according to an embodiment of the present invention shown in FIG. 4.

First, referring to FIGS. 5A and 7A, a metal such as Al, Au, Cu, Ti, W, Mo or an alloy thereof is stacked and etched on a substrate 110 divided into a lighting unit and a contact unit to form the lighting unit and the first contact. An auxiliary electrode 111 composed of a single layer or multiple layers is formed in the portion.

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

At this time, the auxiliary electrode 111 may be arranged throughout the lighting unit in a thin matrix shape (see FIG. 6), a mesh shape, a hexagonal or octagonal shape, or a circular shape.

Thereafter, a transparent conductive material such as ITO or IZO is stacked and etched over the entire substrate 110 to form a first electrode 116 including a first contact electrode 127 in the lighting portion and the first and second contact portions. 2 Form a contact electrode 128.

At this time, the first electrode 116 extends to the first contact part outside the lighting part to form the first contact electrode 127, and a part of the lighting part and the second contact part have a second electrode that is electrically insulated from the first electrode 116. A contact electrode 128 may be formed. That is, the second contact electrode 128 may be formed in the same layer as the first electrode 116, but may be separated from and electrically insulated from the first electrode 116.

As an example, Figure 5a shows that the first electrode 116 including the first contact electrode 127 is formed in an overall rectangular shape, but the upper central portion is removed to form a recession, and the second contact electrode ( 128) is shown as an example, but the present invention is not limited thereto.

At this time, Figures 5A and 7A show that the auxiliary electrode 111 is formed below the first electrode 116 including the first contact electrode 127, but the present invention is not limited thereto, and the auxiliary electrode 111 is formed below the first electrode 116 including the first contact electrode 127. 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 transmission path for current to the first electrode 116, but also serves as a contact electrode that contacts the outside and applies external current to the first electrode 116. can do.

Next, referring to FIGS. 5B and 7B, an inorganic material such as SiNx or SiOx or an organic material such as photoacrylic is laminated on a portion of the lighting portion of the substrate 110. Thereafter, the inorganic or organic material is etched to form a first protective layer (115a) on the top and sides of the auxiliary electrode 111 of the lighting unit, and at the same time, a contact hole 114 is formed exposing a portion of the second contact electrode 128. form

At this time, the first protective layer 115a is formed to cover the auxiliary electrode 111 and the first electrode 112 above it, but the first protective layer 115a is not formed in the light emitting area where actual light is emitted. (However, referring to FIG. 6, the first protective layer 115a may actually be formed in a matrix form in the light emitting area to cover the auxiliary electrodes 111 arranged in a matrix form). In particular, the first protective layer 115a is formed to surround the auxiliary electrode 111 to reduce the step caused by the auxiliary electrode 111, so that various layers formed thereafter can be formed stably without disconnection. In FIG. 5B, the first protective layer 115a is shown as a rectangular frame shape with a certain width overall, but as described above, the auxiliary electrode 111 in which the first protective layer 115a is actually arranged in a matrix form in the light emitting area. It can be formed in a matrix form to cover. In addition, Figure 5b shows an example where the first protective layer 115a on the first electrode 112 and the first protective layer 115a on the second contact electrode 128 are formed to be separated (disconnected) from each other. However, the present invention is not limited to this.

In particular, as described above, the first protective layer 115a according to an embodiment of the present invention is a flattening layer on the lower first protective layer 115a' having a wrinkled (or uneven) structure and is formed as an upper first protective layer 115a". ) can be formed in a laminated double-layer structure. However, the present invention is not limited to this, and the first protective layer 115a of the present invention has a corrugated (or uneven) structure. ) can also be formed only.

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

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

The lower first protective layer 115a' and the upper first protective layer 115a" formed in this way can reduce optical loss through refractive index matching.

In addition, the lower first protective layer 115a' has a wrinkled (or uneven) structure on the surface and can condense light by diffusely reflecting the light generated within the organic light-emitting layer or the light reflected internally through the auxiliary electrode 111. You can.

Hereinafter, an example of forming the lower first protective layer 115a' with a wrinkled (or uneven) structure using methylsilsesquioxane will be described in detail with reference to the drawings.

8A to 8D are cross-sectional views exemplarily showing a method of forming a lower first protective layer in the method of manufacturing a lighting device using an organic light-emitting device according to an embodiment of the present invention.

Figure 9 is a structural formula showing methylsilsesquioxane.

And, Figure 10 is a structural formula illustrating the curing reaction of methylsilsesquioxane.

Referring to FIG. 8A, siloxane is coated on the substrate 110 to form a siloxane film 115.

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

At this time, SOG (Spin-on Glass) can be used, and SOG is a process in which glass dissolved in an organic solvent is spin coated and heat treated to form a SiO ₂ insulating film.

For reference, siloxane is a general term for compounds containing silicon, oxygen, and hydrogen among compounds containing Si-O bonds (siloxane bonds).

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

Methylsilsesquioxane has a CH ₃ group bonded to the Si-O chain.

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

At this time, when the siloxane coated on the substrate 115 is cured at a temperature of 240° C. or lower, a variation (or difference) in the degree of curing occurs depending on the depth of the siloxane. In other words, the siloxane at the top and bottom is cured more as more energy is injected than the siloxane at the center. Accordingly, the upper and lower primary cured siloxane films 115" are cured more firmly (solidly) than the central primary cured siloxane films 115'.

Thereafter, referring to FIGS. 8C and 8D, the primary cured siloxane film (115', 115") is subjected to secondary curing at a temperature of about 250° C. or higher in a vacuum state to form the secondary cured siloxane film (115a). form

At this time, out-gas 140, such as moisture (H ₂ O), escapes from within the primary cured siloxane film 115' in the central portion near the upper primary cured siloxane film 115", and at the same time, 1 Due to the difference in curing degree of the secondary cured siloxane films 115' and 115", the surface shrinks, thereby creating wrinkles on the surface of the secondary cured siloxane film 115a.

As an example, referring to FIG. 10, when liquid siloxane containing an organic type and an alcohol type is cured, the -OH group is lost to moisture and a Si-O bond is created. In other words, a SiOx-based dense inorganic film is formed.

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

Next, referring to FIGS. 5C, 5D, and 7C to 7E, an organic light emitting material, an organic light emitting layer 130 made of a metal and an organic insulating material, and a second electrode 126 are present in the lighting portion of the substrate 110. and a second protective layer 115b are formed, respectively.

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

At this time, the organic light-emitting layer 130 is 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 may be composed of a tandem structure including a blue light-emitting layer and a yellow-green light-emitting layer. In addition, the organic light-emitting layer 130 includes an electron injection layer and a hole injection layer that respectively inject electrons and holes into the light-emitting layer, an electron transport layer and a hole transport layer that respectively transport the injected electrons and holes to the light-emitting layer, and charges such as electrons and holes. It may include a charge generation layer that generates.

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

At this time, the second electrode 126 may be electrically connected to the second contact electrode 128 below it through the contact hole 114.

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

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

At this time, since the first protective layer 115a is disposed on the top of the auxiliary electrode 111 of the lighting unit, the organic light-emitting layer 130 on the top of the auxiliary electrode 111 is not in direct contact with the first electrode 116, so that the auxiliary electrode (115a) is not in direct contact with the first electrode 116. 111) Organic light emitting elements are not formed in the upper part. That is, the organic light emitting element in the lighting unit is formed only in the light emitting area defined by, for example, the auxiliary electrode 111 in a matrix shape (see FIG. 6).

Next, referring to FIG. 7E, a second protective layer 115b made of an organic material is formed within the lighting portion of the substrate 110 to cover the organic light emitting layer 130 and the second electrode 126.

That is, the second protective layer 115b is formed to cover the organic light-emitting layer 130 and the second electrode 126 of the lighting unit, as described above, and serves to prevent moisture from penetrating into the organic light-emitting layer 130 of the lighting unit. can do.

The organic light-emitting layer 130, the second electrode 126, and the second protective layer 115b can be formed in-line using a roll-making device, but the present invention is not limited thereto.

Next, a third protective layer 115c is formed on the lighting portion of the substrate 110 to cover the second protective layer 115b.

The third protective layer 115c can be formed through another roll-making device.

The third protective layer 115c may be made of an inorganic material such as SiOx or SiNx. However, the present invention is not limited to this.

A predetermined encapsulant may be additionally provided on the third protective layer 115c, and such encapsulant may be an epoxy-based compound, an acrylate-based compound, or an acrylic-based compound.

Next, referring to FIGS. 5E and 7F, an adhesive 118 made of a photocurable adhesive material or a thermosetting adhesive material is applied on the lighting portion of the substrate 110. Then, the lighting device can be completed by placing the metal film 170 on it and then attaching the metal film 170 by curing the adhesive 118.

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

Although many details are described in detail in the above description, this should be interpreted as an example of a preferred embodiment rather than limiting the scope of the invention. Therefore, the invention should not be determined by the described embodiments, but by the scope of the patent claims and their equivalents.

100: lighting 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 protective layer provided on top of the auxiliary electrode to cover the auxiliary electrode and having a wrinkled (or uneven) structure on the surface;
an organic light-emitting layer and a second electrode provided on the lighting portion of the substrate provided with the first protective layer; and
A lighting device using an organic light emitting device including a metal film provided in the lighting portion of the substrate. The method of claim 1, wherein the substrate is divided into the lighting unit and first and second contact units,
A lighting device using an organic light emitting element wherein the first and second contact units are located outside the lighting unit. The lighting device according to claim 1, further comprising a planarization layer provided on the first protective layer. The lighting device of claim 3, wherein the planarization layer is made of an insulating material with a relatively low refractive index compared to the first protective layer. The method of claim 2, wherein the first electrode extends to the first contact portion to form a first contact electrode,
A lighting device using an organic light emitting device, further comprising a second contact electrode provided on the lighting unit and the second contact unit in the same layer as the first electrode. The lighting device of claim 1, wherein the first protective layer is made of siloxane. Forming an auxiliary electrode and a first electrode on a substrate;
forming a first protective layer on top of the auxiliary electrode to cover the auxiliary electrode and having a wrinkled (or uneven) structure on the surface;
forming an organic light-emitting layer and a second electrode on the lighting portion of the substrate on which the first protective layer is formed; and
A method of manufacturing a lighting device using an organic light emitting device, comprising the step of attaching a metal film to the lighting part of the substrate using an adhesive. The method of claim 7, wherein forming the first protective layer comprises:
forming a siloxane film by coating siloxane on the substrate on which the auxiliary electrode and the first electrode are formed;
Primary curing the substrate on which the siloxane film is formed; and
A method of manufacturing a lighting device using an organic light emitting device comprising the step of secondary curing the primary cured siloxane film to form a wrinkled (or uneven) structure on the surface. The method of claim 8, wherein the siloxane film is cured to have different degrees of curing depending on depth through the primary curing. The method of manufacturing a lighting device using an organic light emitting device according to claim 9, wherein the upper and lower primary cured siloxane films are cured more firmly (solidly) than the primary cured siloxane films in the central part. 11. The method of claim 10, wherein through the secondary curing, out-gas escapes from the primary cured siloxane film in the central portion near the upper primary cured siloxane film, and at the same time, the primary cured siloxane films A method of manufacturing a lighting device using an organic light emitting device in which the surface shrinks due to differences in the degree of curing and wrinkles are created on the surface. The method of claim 7, further comprising forming a planarization layer on the first protective layer. The method of claim 12, wherein the planarization layer is formed of an insulating material with a relatively low refractive index compared to the first protective layer.

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