KR102589995B1 - Lighting apparatus using organic light emitting diode - Google Patents

Abstract

The present invention relates to a lighting device using an organic light emitting device. The lighting device according to the present invention is divided into a first region and a second region, and is disposed on a substrate, a water repellent layer disposed on the substrate, and a first region on the water repellent layer. auxiliary wiring, a plurality of moisture absorption patterns disposed in the second region on the water-repellent layer, a first electrode disposed on the front surface of the substrate on which the auxiliary wiring and a plurality of moisture absorption patterns are disposed, an organic layer disposed on the first electrode, and on the organic layer. By including the second electrode disposed, the reliability of the lighting device can be improved.

Description

Lighting device using organic light emitting elements {LIGHTING APPARATUS USING ORGANIC LIGHT EMITTING DIODE}

The present invention relates to a lighting device using an organic light-emitting device, and more specifically, to a lighting device using an organic light-emitting device with improved reliability.

Currently, lighting devices mainly use fluorescent lights 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 have the highest luminous efficiency in the red wavelength band, and luminous efficiency decreases toward the red and green wavelength bands, which are the colors with the highest visibility. Therefore, when white light is emitted by combining red light emitting diodes, green light emitting diodes, and red light emitting diodes, there is a disadvantage in that light emission efficiency is lowered.

As another alternative, lighting devices using organic light emitting diodes (OLED) are being developed. An organic light emitting device consists of an anode, a plurality of organic layers, and a cathode sequentially formed on a substrate.

A plurality of organic layers included in an organic light-emitting device are vulnerable to moisture, and when moisture penetrates into the organic layer from the outside, the organic layer shrinks (cell shrinkage), which causes a problem in which the reliability of the organic light-emitting device is reduced.

The problem to be solved by the present invention is to provide a lighting device using an organic light emitting device that prevents moisture from entering from the outside.

Another problem to be solved by the present invention is to provide a lighting device using an organic light emitting device with a simplified structure.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

In order to solve the above-described problem, a lighting device using an organic light-emitting device according to an embodiment of the present invention is divided into a first region and a second region, and includes a substrate, a water-repellent layer disposed on the substrate, and a second region on the water-repellent layer. An auxiliary wiring disposed in one area, a plurality of moisture absorption patterns disposed in a second region on the water repellent layer, a first electrode disposed on the front surface of the substrate on which the auxiliary wiring and a plurality of moisture absorption patterns are disposed, and an organic layer disposed on the first electrode and a second electrode disposed on the organic layer, thereby improving the reliability of the lighting device.

Specific details of other embodiments are included in the detailed description and drawings.

The present invention can improve the reliability of a lighting device by preventing moisture infiltration from the outside by disposing a plurality of barrier layers in a specific area.

In the present invention, a separate insulating layer is not disposed on the anode, so not only can the thickness of the lighting device be reduced, but flexibility can also be improved.

The effects according to the present invention are not limited to the contents exemplified above, and further various effects are included in the present specification.

1 is a cross-sectional view exemplarily showing a lighting device using an organic light-emitting device according to an embodiment of the present invention.
2A to 2C are cross-sectional views showing a stack structure of an organic layer according to an embodiment of the present invention.
FIG. 3A is a front view of a lighting device using an organic light-emitting device according to an embodiment of the present invention, and FIG. 3B is an enlarged view of a lighting portion of a lighting device using an organic light-emitting device according to an embodiment of the present invention.
FIG. 4 is a cross-sectional view taken along line I-I' shown in FIG. 3A.
Figure 5 is a cross-sectional view of a lighting device using an organic light-emitting device according to another embodiment of the present invention.

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 that common knowledge in the technical field to which the present invention pertains is not limited. 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.

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining embodiments of the present invention are illustrative, and the present invention is not limited to the matters shown. Additionally, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. When 'includes', 'has', 'consists of', etc. mentioned in this specification are used, other parts may be added unless 'only' is used. In cases where a component is expressed in the singular, the plural is included unless specifically stated otherwise.

When interpreting components, it is interpreted to include the margin of error even if there is no separate explicit description.

In the case of a description of a positional relationship, for example, if the positional relationship of two parts is described as 'on top', 'on the top', 'on the bottom', 'next to', etc., 'immediately' Alternatively, there may be one or more other parts placed between the two parts, unless 'directly' is used.

When an element or layer is referred to as being on another element or layer, it includes all cases where another layer or other element is interposed directly on or in the middle of another element.

Although first, second, etc. are used to describe various elements, these elements are not limited by these terms. These terms are merely used to distinguish one component from another. Accordingly, the first component mentioned below may also be the second component within the technical spirit of the present invention.

Like reference numerals refer to like elements throughout the specification.

The size and thickness of each component shown in the drawings are shown for convenience of explanation, and the present invention is not necessarily limited to the size and thickness of the components shown.

Each feature of the various embodiments of the present invention can be partially or fully combined or combined with each other, and as can be fully understood by those skilled in the art, various technical interconnections and operations are possible, and each embodiment may be implemented independently of each other. It may be possible to conduct them together due to a related relationship.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings.

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

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 than inorganic light-emitting devices, the color rendering index (CRI) is improved, making the light from lighting devices more similar to sunlight. There are also advantages.

Referring to FIG. 1, a lighting device 100 using an organic light-emitting device according to an embodiment of the present invention includes an organic light-emitting device (OLED) that emits surface light and an encapsulation portion 120 that encapsulates the organic light-emitting device (OLED). It may be configured to include.

Specifically, the lighting device 100 using an organic light emitting device according to an embodiment of the present invention includes a substrate 111, an internal light extraction layer 112, a planarization layer 113, a barrier layer 114, sequentially from the bottom. It may include a water repellent layer 115, a moisture absorption layer 116 including a moisture absorption pattern, a first electrode 117, an organic layer 118, and a second electrode 119.

Additionally, an external light extraction layer 130 may be additionally provided below the organic light emitting device (OLED) to increase haze. However, the present invention is not limited to this, and the lighting device 100 of the present invention may not include the external light extraction layer 130. Here, the external light extraction layer 130 is composed of scattering particles such as TiO ₂ dispersed in resin, and may be attached to the lower part of the substrate 111 through an adhesive layer (not shown).

In addition, as will be described later with reference to FIG. 3B, a lighting device using an organic light emitting device according to an embodiment of the present invention includes an auxiliary wiring (AL) and a first electrode to supplement the conductivity of the first electrode 117. It may further include an insulating layer (INS) to prevent short circuit of (117) and the second electrode (119).

The substrate 111 may be made of transparent glass. Additionally, the substrate 111 may be made of a polymer material such as polyimide, which has flexible properties.

Here, the organic layer 118 where light is emitted and the first electrode 117 and second electrode 119 disposed on the upper and lower surfaces of the organic layer 118 and supplying charge to the organic layer 118 are organic light emitting devices (OLEDs; Organic Light). Emitting Diode) can be configured.

For example, the first electrode 117 may be an anode that supplies holes to the organic layer 118, and the second electrode 119 may be a cathode that supplies electrons to the organic layer 118. (cathode), but is not limited to this, and the first electrode 117 and the second electrode 119 may have different roles.

Generally, the first electrode 117 is made of ITO (Indium Tin Oixde) or IZO (Indium Zinc Oxide), a transparent metallic oxide material with good conductivity and a high work function to facilitate hole injection, or a thin film of metal. It can be composed of . Here, specific examples of thin film metals include magnesium (Mg), calcium (Ca), sodium (Na), titanium (Ti), indium (In), yttrium (Y), lithium (Li), gadolinium (Gd), and aluminum. It refers to metals such as (Al), silver (Ag), tin (Sn), and lead (Pb), or alloys thereof, and the first electrode 117 may be composed of a single layer (single stack), but It can also be composed of multiple layers made of one material.

Additionally, the second electrode 119 is preferably made of a conductive material with a low work function to facilitate electron injection into the organic layer 118. Specific examples of materials used as the second electrode 119 include magnesium (Mg), calcium (Ca), sodium (Na), titanium (Ti), indium (In), yttrium (Y), lithium (Li), and gadolinium. It may be composed of metals such as (Gd), aluminum (Al), silver (Ag), tin (Sn), and lead (Pb), or alloys thereof. And the second electrode 119 may also be composed of a single layer (single stack), but may also be composed of a multi-layer (multi stack) composed of the above-described materials.

In addition, the organic layer 118 is composed of a single stack structure including a red organic light emitting layer (EML), or a multi stack tandem structure including a plurality of red organic light emitting layers (EML). It may be formed as a multi-stack tandem structure including a red-green organic light-emitting layer (EML) and a sky-blue organic light-emitting layer (EML).

In addition, the organic layer 118 includes an electron injection layer (EIL) and a hole injection layer (HIL) that respectively inject electrons and holes into the organic light emitting layer (EML), and an electron transport layer (ETL) that transports the injected electrons and holes to the light emitting layer, respectively. ) and a hole transport layer (HTL), and a charge generation layer (CGL) that generates charges such as electrons and holes. The specific structure for this will be described later with reference to FIGS. 2A to 2C.

When current is applied to the first electrode 117 and the second electrode 119, electrons are injected into the organic layer 118 from the second electrode 119 and holes are injected into the organic layer 118 from the first electrode 117. do. Afterwards, excitons are generated in the organic layer 118, and as the generated 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 occurs.

Here, the light generated from the organic layer 118 may be determined to emit front or bottom light depending on the transmittance and reflectance of the first electrode 117 and the second electrode 119.

In one embodiment of the present invention, as described above, the first electrode 117 is a transparent electrode and the second electrode 119 can be used as a reflective electrode, so the light generated from the organic layer 118 is transmitted to the second electrode ( 119), light passes through the first electrode 117 and is generated at the bottom of the organic light emitting device (OLED). That is, the organic light emitting device (OLED) according to one embodiment of the present invention can emit bottom light. However, it is not limited to this, and the first electrode 117 is a reflective electrode and the second electrode 119 is used as a transparent electrode, so that the organic light emitting device (OLED) may emit light from the entire surface.

In addition, a moisture absorption layer 116 including a moisture absorption pattern for absorbing moisture is disposed below the first electrode 117, and a water repellent layer 115 that blocks penetration of moisture is disposed below the moisture absorption layer 116. You can.

Specifically, the water-repellent layer 115 serves to block moisture penetrating through pinholes and cracks in the structure of the substrate 111 and the internal light extraction layer 112 disposed below. . That is, the water repellent layer 115 reduces the water vapor transmission rate (WTVR), which is the degree to which moisture can penetrate per unit area, so that moisture does not reach the organic layer 118, causing cell shrinkage of the organic layer 118. ) can be prevented.

Accordingly, the reliability of the lighting device 100 including the organic light emitting device can be improved by preventing distortion of the lighting device 100 .

For this purpose, the water-repellent layer 115 may be formed of a hydrophobic material, and specifically, fluorinated Parylene (AF4) such as [Chemical Formula 1], where the substituent is a fluorine material, or fluorinated silica nanoparticles ( It may be composed of fluorinated silica nanoparticles or Teflon.

[Formula 1]

The thickness of the water repellent layer 115 is preferably 1 μm to 2 μm in consideration of appropriate water repellent effect and increased thickness, but is not limited to this and may vary depending on the design.

However, although this water-repellent layer 115 has excellent water-repellent properties, the water-repellent layer 115 itself does not have the property of absorbing moisture, so there is a risk that moisture that has penetrated the water-repellent layer 115 may infiltrate some of the organic layer 118. .

To improve this, a moisture absorption layer 116 that absorbs moisture may be disposed between the water repellent layer 115 and the organic layer 118.

The moisture absorption layer 116 may be formed by including a getter that absorbs moisture in resin.

The thickness of the moisture absorption layer 116 is preferably formed to be 1 μm to 2 μm in consideration of appropriate moisture absorption effect and thickness increase, but is not limited to this and may vary depending on the design.

Here, the resin that serves as the base of the moisture absorption layer 116 may be specifically composed of an aliphatic monomer.

And the getter may be composed of MOF (Metal Organic Frameworks), a hygroscopic organometallic compound. Specifically, a hygroscopic organometallic compound (MOF) refers to a crystalline material with a skeletal structure formed by linking metal ions and organic molecules.

This MOF may be a crystalline material with a skeletal structure of 100 nm or less in diameter in which iron (Fe) or zirconium (Zr) metal ions and organic molecules are combined, and moisture may be absorbed within these regularly arranged crystals.

And the getter can not only be composed of MOF, but also formed of calcium oxide (Cao), nanoscale zeolite, imogolite, ceramics (Al ₂ O ₃ , ZrO ₂ ), etc. It can be.

Additionally, the moisture absorption layer 116 may additionally contain nanoscale filter particles to delay moisture penetration by impeding the moisture penetration path.

These nanoscale filter particles are preferably composed of a silicon oxide filter (SiO ₂ filter) or plate-shaped talc.

In this way, the moisture-absorbing layer 116 is disposed on the upper side of the water-repellent layer 115, so that even if some moisture permeates upward from the water-repellent layer 115, even the partially transmitted moisture is prevented due to the getter of the moisture-absorbing layer 116. Because it is absorbed, moisture does not reach the organic layer 118 and cell shrinkage of the organic layer 118 can be prevented. Accordingly, the reliability of the lighting device 100 including the organic light emitting device can be improved by preventing distortion of the lighting device 100 .

Additionally, the barrier layer 114 is disposed below the water repellent layer 115 and serves to block moisture, air, or fine particles penetrating from the substrate 111 and the internal light extraction layer 112.

To prevent penetration of moisture and air, the barrier layer 114 may include a plurality of inorganic barrier layers, and to block fine particles, the barrier layer 114 may include a plurality of organic barrier layers. You can.

Additionally, the internal light extraction layer 112 is disposed between the substrate 111 and the barrier layer 114 to increase the efficiency with which light generated from the bottom-emitting organic light emitting device is extracted to the outside.

The internal light extraction layer 112 inserts titanium oxide (TiO ₂ ) particles into the resin to increase internal light scattering and surface roughness to increase light extraction efficiency. Specifically, the internal light extraction layer 112 may be formed to a thickness of 450 nm through inkjet-coating, and the diameter of the titanium oxide (TiO ₂ ) particles may be 200 nm to 300 nm. However, these specific values may vary depending on the needs of the design of the lighting device 100.

In addition, the planarization layer 113 is disposed on the internal light extraction layer 112 to compensate for the surface roughness of the internal light extraction layer 112, thereby improving the reliability of the organic light emitting device (OLED).

The planarization layer 113 is composed of zirconia particles inserted into resin, and compensates for the surface roughness of the internal light extraction layer 112. Specifically, the planarization layer 113 may be formed to a thickness of 150 nm through inkjet-coating, and the diameter of the zirconia particles may be 50 nm. However, these specific values may vary depending on the needs of the design of the lighting device 100.

The encapsulation portion 120 covers the organic light emitting device (OLED) and serves to protect the organic light emitting device (OLED) by blocking external influences, and includes an adhesive layer 121 in contact with the second electrode 119, It includes a metal film 122 in contact with the adhesive layer 121 and a protective film 123 attached to the metal film 122.

The adhesive layer 121 may be composed of PSA (Pressure Sensitive Adhesive) that attaches the metal film 122 and the organic light emitting device (OLED), and the thickness of the adhesive layer 121 may be 30 um, but is not limited to this. , may be changed in various ways depending on the needs of the design of the lighting device 100.

The metal film 122 is disposed on the adhesive layer 121 and serves to maintain the rigidity of the lighting device 100 itself. For this purpose, the metal film 122 may be formed of copper (Cu) with a thickness of 20 μm, but is not limited to this and may be changed in various ways depending on the needs of the design of the lighting device 100.

And the protective film 123 is disposed on the metal film 122 to absorb and protect the external shock of the lighting device 100. For this purpose, the protective film 123 may be formed of PET (Polyethylene terephthalate) film, a polymer film with a thickness of 100 μm, but is not limited to this and may be changed in various ways depending on the needs of the design of the lighting device 100.

2A to 2C are cross-sectional views showing a stack structure of an organic layer according to an embodiment of the present invention.

Specifically, FIG. 2A shows the organic layer 118 of a single stack, FIG. 2B shows the organic layer 118 of a tandem structure including a double stack, and FIG. 2C shows the organic layer 118 of a single stack. The organic layer 118 of a tandem structure including a triple stack is shown.

Referring to FIG. 2A, the organic layer 118 includes a hole injection layer (HIL), a hole transport layer (HTL), an electron blocking layer (EBL), and an organic light emitting layer (EML) (Emission layer, EML), an electron transport layer (ETL), and an electron injection layer (EIL) are sequentially stacked.

The hole injection layer (HIL) is an organic layer that facilitates injection of holes from the first electrode 117 to the organic light emitting layer (EML). The hole injection layer (HIL) is, for example, HAT-CN (dipyrazino[2,3-f:2',3'-h]quinoxaline-2,3,6,7,10.11-hexacarbonitrile), CuPc (phthalocyanine) ), F4-TCNQ(2,3,5,6-tetrafluoro-7,7,8,8-tetracyano-quinodimethane), and NPD(N,N'-bis(naphthalene-1-yl)-N,N' -bis(phenyl)-2,2'-dimethylbenzidine), but is not limited thereto.

The hole transport layer (HTL) is an organic layer that smoothly transfers holes from the hole injection layer (HIL) to the organic light emitting layer (EML). The hole transport layer (HTL) is, for example, NPD(N,N'-bis(naphthalene-1-yl)-N,N'-bis(phenyl)-2,2'-dimethylbenzidine), TPD(N,N '-bis-(3-methylphenyl)-N,N'-bis(phenyl)-benzidine), s-TAD(2,2',7,7'-tetrakis(N,N-dimethylamino)-9,9- It may be made of a material containing one or more of spirofluorene) and MTDATA (4,4',4"-Tris(N-3-methylphenyl-N-phenyl-amino)-triphenylamine), but is not limited thereto.

The electron blocking layer (EBL) is an organic layer that prevents electrons injected into the organic light emitting layer (EML) from passing to the hole transport layer (HTL). The electron blocking layer (EBL) prevents the movement of electrons, improves the coupling of holes and electrons in the organic light emitting layer (EML), and can improve the luminous efficiency of the organic light emitting layer (EML). This electron blocking layer (EBL) may be made of the same material as the hole transport layer (HTL), and the hole transport layer (HTL) and the electron blocking layer (EBL) may be formed as separate layers, but are not limited to this and the hole transport layer ( HTL) and electronic blocking layer (EBL) can be integrated.

In the organic light emitting layer (EML), holes supplied through the first electrode 117 and electrons supplied through the second electrode 119 recombine, thereby generating excitons. Additionally, the area where excitons are generated may be referred to as an emission area (Emission Area) or a recombination area.

The organic light emitting layer (EML) is disposed between the hole transport layer (HTL) and the electron transport layer (ETL) and includes a material that can emit light of a specific color. At this time, the organic light emitting layer (EML) may include a material capable of emitting red light.

The organic light-emitting layer (EML) may have a host-dopant system, that is, a system in which the host material occupies a large weight ratio and the light-emitting dopant material occupies a small weight ratio.

At this time, the organic emission layer (EML) may include a plurality of host materials or a single host material. An organic light emitting layer (EML) containing a plurality of host materials or a single host material is doped with a red phosphorescent dopant material. That is, the organic light emitting layer (EML) is a red light emitting layer, and the wavelength of light emitted from the organic light emitting layer (EML) may be in the range of 600 nm to 660 nm.

A red phosphorescent dopant material is a material that can emit red light. The EL spectrum of light emitted from an organic light emitting layer (EML) doped with a red phosphorescent dopant material may have a peak in a red wavelength region or may have a peak in a wavelength region corresponding to red.

Red phosphorescent dopant materials include Ir(ppy) ₃ (fac tris(2-phenylpyridine)iridium)(tris(2-phenylpyridine)iridium), PIQIr(acac)(bis(1-phenylisoquinoline) acetylacetonate iridium), and PQIr(acac)( bis(1-phenylquinoline) acetylacetonate iridium), PQIr(tris(1-phenylquinoline) iridium) Ir(piq) ₃ (tris(1-phenylisoquinoline)iridium), Ir(piq) ₂ (acac)(bis(1-phenylisoquinoline) It may be made of a material containing one or more of an iridium (Ir) ligand complex containing (acetylacetonate)iridium), PtOEP (octaethylporphyrinporphine platinum) PBD:Eu(DBM) ₃ (Phen), or Perylene, but is not limited thereto.

The electron transport layer (ETL) receives electrons from the electron injection layer (EIL). The electron transport layer (ETL) transfers the supplied electrons to the organic light emitting layer (EML).

Additionally, the electron transport layer (ETL) may function like a hole blocking layer (HBL). The hole blocking layer can prevent holes that failed to participate in recombination from leaking out of the organic light emitting layer (EML).

The electron transport layer (ETL) is, for example, Liq (8-hydroxyquinolinolato-lithium), PBD (2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole), TAZ (3-(4-biphenyl)4-phenyl-5-tert-butylphenyl-1,2,4-triazole), BCP(2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline) and BAlq( It may be made of one or more of bis(2-methyl-8-quinolinolate)-4-(phenylphenolato)aluminium), but is not limited thereto.

The electron injection layer (EIL) is a layer that facilitates the injection of electrons from the second electrode 119 to the organic light emitting layer (EML). The electron injection layer (EIL) may be made of a material containing at least one of alkali metal or alkaline earth metal ions, such as LiF, BaF2, CsF, etc., but is not limited thereto.

The electron injection layer (EIL) and the electron transport layer (ETL) may be omitted depending on the structure or characteristics of the lighting device 100 using an organic light emitting device.

Referring to FIG. 2B, the organic layer 118 includes a first stack (ST1) including a first organic light emitting layer (EML1), a second stack (ST2) including a second organic light emitting layer (EML2), and a first stack (ST1). ) and a charge generation layer (CGL) disposed between the second stack (ST2).

Here, the first stack (ST1) includes an electron injection layer (EIL), a first electron transport layer (ETL1), a first organic light emitting layer (EML1), a first electron blocking layer (EBL1), and a first hole transport layer (HTL1). And the second stack (ST2) includes a second electron transport layer (ETL2), a second organic light emitting layer (EML2), a second electron blocking layer (EBL2), a second hole transport layer (HTL2), and a hole injection layer (HIL). The roles and composition of each layer are as described above.

Meanwhile, the charge generation layer (CGL) is disposed between the first stack (ST1) and the second stack (ST2). The charge generation layer (CGL) supplies charges to the first stack (ST1) and the second stack (ST2) to control charge balance in the first stack (ST1) and the second stack (ST2).

The charge generation layer (CGL) includes an N-type charge generation layer (N-CGL) and a P-type charge generation layer (P-CGL). The N-type charge generation layer (N-CGL) is in contact with the second electron transport layer (ETL2), and the P-type charge generation layer (P-CGL) is in contact with the N-type charge generation layer (N-CGL) and the first hole transport layer (HTL1). placed in between. The charge generation layer (CGL) may be composed of a plurality of layers including an N-type charge generation layer (N-CGL) and a P-type charge generation layer (P-CGL), but is not limited to this and may be composed of a single layer. there is.

The N-type charge generation layer (N-CGL) injects electrons into the first stack (ST1). The N-type charge generation layer (N-CGL) may include an N-type dopant material and an N-type host material. The N-type dopant material may be a metal of groups 1 and 2 of the periodic table, an organic material capable of injecting electrons, or a mixture thereof. For example, the N-type dopant material may be either an alkali metal or an alkaline earth metal. That is, the N-type charge generation layer (N-CGL) is an alkali metal such as lithium (Li), sodium (Na), potassium (K), or cesium (Cs), or magnesium (Mg), strontium (Sr), or barium. (Ba), or may be made of an organic layer 118 doped with an alkaline earth metal such as radium (Ra), but is not limited thereto. The N-type host material is a material capable of transferring electrons, for example, Alq ₃ (tris(8-hydroxyquinolino)aluminum), Liq(8-hydroxyquinolinolato-lithium), PBD(2-(4-biphenylyl)-5- (4-tert-butylphenyl)-1,3,4oxadiazole), TAZ(3-(4-biphenyl)4-phenyl-5-tert-butylphenyl-1,2,4-triazole), spiro-PBD, and BAlq( bis(2-methyl-8-quinolinolate)-4-(phenylphenolato)aluminium), SAlq, TPBi(2,2',2-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H- It may be composed of one or more of benzimidazole, oxadiazole, triazole, phenanthroline, benzoxazole, or benzthiazole, but is not limited thereto.

The P-type charge generation layer (P-CGL) injects holes into the second stack (ST2). The P-type charge generation layer (P-CGL) may include a P-type dopant material and a P-type host material. P-type dopant materials include metal oxides, organic substances such as tetrafluoro-tetracyanoquinodimethane (F4-TCNQ), HAT-CN (Hexaazatriphenylene-hexacarbonitrile), hexaazatriphenylene, etc., or V ₂ O ₅ , MoOx, WO It may be made of a metal material such as ₃ , but is not limited thereto. The P-type host material is a material capable of transporting holes, for example, NPD (N,N-dinaphthyl-N,N'-diphenyl benzidine) (N,N'-bis(naphthalene-1-yl)-N, N'-bis(phenyl)-2,2'-dimethylbenzidine), TPD (N,N'-bis-(3-methylphenyl)-N,N'-bis-(phenyl)-benzidine) and MTDATA (4,4 It may be made of a material containing one or more of ',4-Tris(N-3-methylphenyl-N-phenyl-amino)-triphenylamine), but is not limited thereto.

Referring to FIG. 2C, the organic layer 118 includes a first stack (ST1) including a first organic light-emitting layer (EML1), a second stack (ST2) including a second organic light-emitting layer (EML2), and a third organic light-emitting layer ( A third stack (ST3) including (EML3), a first charge generation layer (CGL1) disposed between the first stack (ST1) and the second stack (ST2), and the second stack (ST2) and the third stack (ST3) ) and a second charge generation layer (CGL2) disposed between them.

Here, the first stack (ST1) includes an electron injection layer (EIL), a first electron transport layer (ETL1), a first organic light emitting layer (EML1), a first electron blocking layer (EBL1), and a first hole transport layer (HTL1). And, the second stack (ST2) includes a second electron transport layer (ETL2), a second organic light emitting layer (EML2), a second electron blocking layer (EBL2), and a second hole transport layer (HTL2), and the third stack (ST3) ) includes a third electron transport layer (ETL3), a third organic light emitting layer (EML3), a third electron blocking layer (EBL3), a third hole transport layer (HTL3), and a hole injection layer (HIL), and the roles of each of these layers and The configuration is the same as described above.

And, the first charge generation layer (CGL1) includes a first N-type charge generation layer (N-CGL1) and a first P-type charge generation layer (P-CGL1), and the first N-type charge generation layer (N- CGL1) is in contact with the second electron transport layer (ETL2), and the first P-type charge generation layer (P-CGL1) is disposed between the first N-type charge generation layer (N-CGL1) and the first hole transport layer (HTL1). .

The second charge generation layer (CGL2) includes a second N-type charge generation layer (N-CGL2) and a second P-type charge generation layer (P-CGL2), and the second N-type charge generation layer (N-CGL2) is in contact with the third electron transport layer (ETL3), and the second P-type charge generation layer (P-CGL2) is disposed between the second N-type charge generation layer (N-CGL2) and the second hole transport layer (HTL2). The role and configuration of the first and second charge generation layers (CGL1 and CGL2) are as described above.

However, here, the first organic light-emitting layer (EML1) and the third organic light-emitting layer (EML3) are red-green organic light-emitting layers, and the wavelength emitted from the first organic light-emitting layer (EML1) and the third organic light-emitting layer (EML3) is 520 nm to 580 nm. The second organic light emitting layer (EML2) may be a sky blue organic light emitting layer, and the wavelength range of light emitted from the second organic light emitting layer (EML2) may be 450 nm to 480 nm.

FIG. 3A is a front view of a lighting device using an organic light-emitting device according to an embodiment of the present invention, and FIG. 3B is an enlarged view of a lighting portion of a lighting device using an organic light-emitting device according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view taken along line I-I' shown in FIG. 3A.

Specifically, FIG. 3A shows the arrangement relationship of the first electrode 117, the second electrode 119, and the sealing portion 120, and FIG. 4 shows the arrangement relationship between the first electrode 117, the second electrode 119, and the sealing portion 120, and FIG. It is intended to explain the arrangement relationships of components.

3A and 4, a first electrode 117 is disposed on the substrate 111, a second electrode 119 is disposed on the first electrode 117, and the second electrode 119 ) is disposed to cover the sealing portion 120.

Here, the area where the first electrode 117 and the second electrode 119 overlap is the lighting unit (EA) where light is generated from the organic layer 118 disposed between the first electrode 117 and the second electrode 119. It can be defined as:

In other words, the lighting device 100 according to an embodiment of the present invention is electrically connected to the outside through an illumination unit (EA) that emits actual light and outputs it to the outside, and the first and second contact electrodes 117p and 119p. It can be divided into pad parts (PA1 and PA2) that apply signals to the lighting part (EA).

The pad portions PA1 and PA2 are not covered by the encapsulation portion 120 and can be electrically connected to the outside through the first and second contact electrodes 117p and 119p. Accordingly, the encapsulation part 120 may be attached to the entire surface of the lighting part EA of the substrate 110 excluding the pad parts PA1 and PA2. However, the present invention is not limited to this.

That is, the organic layer 118, the second electrode 119, and the sealing portion 120 are not formed in the pad portions (PA1 and PA2) outside the lighting portion (EA), so the first and second contact electrodes 117p and 119p are formed. It may be exposed to the outside.

The pad units PA1 and PA2 may be located outside the lighting unit EA, and FIG. 3A shows an example where the second pad unit PA2 is located between the first pad units PA1. The invention is not limited to this.

In addition, FIG. 3A shows an example in which the pad portions PA1 and PA2 are located only outside the lighting portion EA, but the present invention is not limited thereto. Accordingly, the pad portions PA1 and PA2 of the present invention may be located both on one outer side and on the other outer side of the lighting portion EA. Additionally, the first pad portion PA1 of the present invention may be located on one outer side of the lighting portion EA, and the second pad portion PA2 may be located on another outer side of the lighting portion EA.

In this regard, the first contact electrode 117p disposed on the first pad portion PA1 is formed of the same material on the same layer as the first electrode 117 disposed on the lighting portion EA, and the first electrode 117p ) It is formed through the same process and is electrically connected to the first electrode 117.

In addition, the second contact electrode 119p disposed on the second pad portion PA2 is formed on the same layer and with the same material through the same process as the second electrode 119p disposed on the lighting portion EA, It is electrically connected to (119).

Accordingly, the first contact electrode 117p disposed on the first pad portion PA1 can transmit a signal applied from the outside to the first electrode 117, and the second contact electrode disposed on the second pad portion PA2 The electrode 119p can transmit a signal applied from the outside to the second electrode 119.

Meanwhile, the first electrode 117 is formed of a transparent conductive film, which has the advantage of transmitting emitted light, but has the disadvantage of having very high electrical resistance compared to opaque metal. Therefore, when manufacturing a large-area lighting device 100, the distribution of current applied to the wide lighting unit (EA) becomes uneven due to the large resistance of the transparent high-resistance conductive film, and this uneven current distribution is caused by the large-area lighting device. It makes it impossible to emit light with uniform brightness.

Meanwhile, as shown in FIGS. 3B and 4, in order to emit light with uniform brightness of the large-area lighting device 100, the first electrode 117 that evenly distributes the current applied to the lighting unit EA and the electrical An auxiliary wire (AL) connected to may be disposed.

The auxiliary wiring (AL) is arranged throughout the lighting unit (EA) in a thin mesh shape, mesh shape, hexagonal or octagonal shape, or circular shape, and is made of aluminum (Al), gold (Au), copper (Cu), It may be made of a metal with good conductivity, such as titanium (Ti), tungsten (W), molybdenum (Mo), or alloys thereof. Although not shown, the auxiliary wiring (AL) may be composed of a two-layer structure of an upper auxiliary wiring (AL) and a lower auxiliary wiring (AL), but the present invention is not limited thereto and may be composed of a single layer.

Here, in FIG. 4, the auxiliary wiring (AL) electrically connected to the first electrode 117 is disposed below the first electrode 117 in order to make electrical contact with the first electrode 117. Although shown, the auxiliary wiring AL may be disposed on the first electrode 117 without being limited thereto.

And, as shown in FIGS. 3B and 4, a short reduction pattern (SR) is formed on the first electrode 117 to which current is supplied to implement a narrow path, and an insulating layer ( The short circuit prevention pattern (SR) is covered with INS) to prevent short circuits in the entire panel. That is, the short circuit prevention pattern (SR) is formed to surround the outside of the light emitting area of each individual pixel, and resistance is added to the individual pixel to limit the current flowing into the short circuit occurrence area.

The insulating layer (INS) is disposed between the first electrode 117 and the second electrode 119 in the first area (A1) where the auxiliary wiring (AL) of the lighting unit (EA) is disposed, causing damage to the organic layer 118. This prevents the first electrode 117 and the second electrode 119 from being short-circuited.

Specifically, the insulating layer (INS) is configured to cover the auxiliary wiring (AL) and the first electrode 117. In this way, the insulating layer (INS) is formed to surround the auxiliary wiring (AL) to reduce the step caused by the auxiliary wiring (AL), thereby ensuring that various layers formed on the insulating layer (INS) are formed stably without disconnection. You can.

Here, the insulating layer (INS) may be composed of an inorganic material such as silicon oxide (SiOx) or silicon nitride (SiNx). Additionally, the insulating layer (INS) may be composed of an organic material such as photoacryl (PAC), or may be composed of a plurality of layers of inorganic materials and organic materials.

Hereinafter, a detailed stacked structure of a lighting device including an organic light-emitting device according to an embodiment of the present invention will be described with reference to FIG. 4 .

In FIG. 4 , for convenience of explanation, the internal light extraction layer 112 and planarization layer 113 of the lighting device using an organic light-emitting device are shown with the deletion.

As shown in FIG. 4, a barrier layer 114 and a water repellent layer 115 are formed on the entire surface of the substrate 111 including the first area A1 and the second area A2, and the first area (A1) In A1), an auxiliary wire (AL) and a first electrode 117 are disposed on the water-repellent layer 115, and in the second area (A2), an auxiliary wire (AL) is disposed on the water-repellent layer 115. A plurality of moisture absorption patterns 116 divided by AL) and the first electrode 117 are disposed on the moisture absorption patterns 116.

Additionally, the thickness of the auxiliary wiring AL disposed in the first area A1 may be thicker than the thickness of the moisture absorption pattern 116 disposed in the second area A2. That is, the auxiliary wiring AL disposed in the first area A1 may be formed to protrude beyond the moisture absorption pattern 116 disposed in the second area A2.

In this form, the moisture absorption pattern 116 disposed in the second area A2 may be formed by including a getter that absorbs moisture into the resin, as described above. That is, since the resin here is a material that can be melted, the auxiliary wiring (AL) is formed protruding from the first area (A1) on the water-repellent layer 115 and then formed through a melting process. The moisture absorption pattern 116 may be formed in the second area A2 that is not exposed to moisture.

In this way, the auxiliary wiring AL disposed in the first area A1 is formed in a shape that protrudes more than the moisture absorption pattern 116 disposed in the second area A2, so that the moisture absorption pattern 116 can be completely partitioned. .

Specifically, as shown in FIG. 3B, a plurality of second areas A2 can be formed to form individual pixels, and the first area A1 surrounds the second area A2 in a matrix form. can be formed in the form of That is, the plurality of moisture absorption patterns 116 disposed in the second area A2 may be divided into individual pixels, and the auxiliary wiring AL disposed in the first area A1 may form the moisture absorption pattern 116 into a matrix. It can be formed in a (Matrix) form that surrounds it.

Here, the moisture absorption pattern 116 represents the same component as the moisture absorption layer shown in FIG. 1, although its shape is expressed differently.

And, as described above, the first electrode 117 disposed in the second area A2 has a short reduction pattern (Short Reduction) that implements a narrow path on the outside of the second area A2. SR) can be formed. In this way, the short circuit prevention pattern SR is formed to surround the outside of the second area A2, which is part of the light emitting area of the individual pixel, and adds resistance to the individual pixel to limit the current flowing to the short circuit occurrence area of the entire panel.

Additionally, the first electrode 117 disposed in the first area A1 and the first electrode 117 disposed in the second area A2 are made of the same material and are disposed on the same layer, and are electrically connected to each other.

And, as described above, on the first electrode 117 in the first area A1 and the second area A2, a plurality of organic layers 118, a second electrode 119, an adhesive layer 121, and a metal The film 122 and the protective film 123 may be disposed.

In this way, the water repellent layer 115 is formed on the entire surface of the substrate 111 to block moisture from penetrating, and the moisture absorption pattern 116 is formed on the water repellent layer 115 to prevent even if some moisture penetrates upward from the water repellent layer 115. , Even partially transmitted moisture can be absorbed due to the getter of the moisture absorption layer 116.

Accordingly, the lighting device 100 including an organic light-emitting device according to an embodiment of the present invention prevents moisture infiltration from the outside, preventing moisture from reaching the organic layer 118, thereby causing cell shrinkage of the organic layer 118. can be prevented. Accordingly, the reliability of the lighting device 100 including the organic light emitting device can be improved by preventing distortion of the lighting device 100 .

Hereinafter, with reference to FIG. 5, a lighting device including an organic light emitting device according to another embodiment of the present invention will be described.

Figure 5 is a cross-sectional view of a lighting device using an organic light-emitting device according to another embodiment of the present invention.

A lighting device including an organic light-emitting device according to an embodiment of the present invention and a lighting device including an organic light-emitting device according to another embodiment of the present invention differ only in the arrangement relationship between the auxiliary wiring and the moisture absorption pattern and the presence or absence of an insulating layer. Since there is, this will be described in detail and redundant content will be omitted.

As shown in FIG. 5, the lighting device 200 using an organic light-emitting device according to another embodiment of the present invention has a first area, like the lighting device 100 using an organic light-emitting device according to an embodiment of the present invention. A barrier layer 114 and a water-repellent layer 115 are formed on the entire surface of the substrate 111 including (A1) and the second area (A2), and an auxiliary water-repellent layer 115 is formed in the first area (A1). The first electrode 217 is disposed on the wiring AL and the auxiliary wiring AL, and in the second area A2, a plurality of moisture absorption patterns are partitioned by the auxiliary wiring AL on the water repellent layer 115 ( 216) and the first electrode 217 is disposed on the moisture absorption pattern 216.

However, unlike the lighting device 100 using an organic light emitting device according to an embodiment of the present invention, the lighting device 200 using an organic light emitting device according to another embodiment of the present invention is disposed in the first area A1. The thickness of the auxiliary wiring AL may be the same as the thickness of the moisture absorption pattern 216 disposed in the second area A2. That is, the auxiliary wire AL disposed in the first area A1 may not protrude beyond the moisture absorption pattern 216 disposed in the second area A2.

Additionally, a first electrode 217, an organic layer 118, and a second electrode are formed on the auxiliary wiring AL disposed in the flat first area A1 and the moisture absorption pattern 216 disposed in the second area A2. An organic light emitting device composed of (119) may be formed flat, and an adhesive layer 121, a metal film 122, and a protective film 123 may be disposed on the organic light emitting device formed flatly.

As in one embodiment of the present invention, when the auxiliary wiring AL disposed in the first area A1 is formed to protrude beyond the moisture absorption pattern 216 disposed in the second area, the first area A1 A step occurs in the first electrode 217 and the organic layer 118 formed in each of the first and second areas A2, and the organic layer 118 is damaged by a weak external force, causing the first electrode 217 and the second electrode 217 to be damaged. A problem may occur in which the electrode 119 is short-circuited. To solve this problem, an insulating layer may be disposed between the first electrode 217 and the plurality of organic layers 118 to prevent short circuit of the organic layer 118, but this has the problem of increasing the thickness of the lighting device.

Accordingly, in one embodiment of the present invention, the auxiliary wire AL disposed in the first area A1 does not protrude beyond the moisture absorption pattern 216 disposed in the second area A2, so that the first area A1 and The step between the first electrode 217 and the organic layer 118 disposed in the second area A2 is reduced. In more detail, the thickness of the auxiliary wiring AL disposed in the first area A1 and the thickness of the moisture absorption pattern 216 disposed in the second area A2 are formed to be the same, so that the first electrode 217 and The level difference of the organic layer 118 can be reduced.

Accordingly, the organic layer 118 is not damaged from external shocks, and the reliability of the lighting device 100 including an organic light-emitting device according to an embodiment of the present invention is improved from external shocks.

In addition, since the reliability of the organic layer 118 generated in the first area A1 and the second area A2 is improved, the above-described insulating layer to enhance the reliability of the plurality of organic layers 118 is not required. . Accordingly, the thickness of the lighting device 100 including an organic light-emitting device according to an embodiment of the present invention can be reduced to achieve thinness, and the lighting device 100 can be thinner to improve flexibility. .

Exemplary embodiments of the present invention may be described as follows.

In order to solve the above-described problem, a lighting device using an organic light-emitting device according to an embodiment of the present invention is divided into a first region and a second region, and includes a substrate, a water-repellent layer disposed on the substrate, and a second region on the water-repellent layer. An auxiliary wiring disposed in one area, a plurality of moisture absorption patterns disposed in a second region on the water repellent layer, a first electrode disposed on the front surface of the substrate on which the auxiliary wiring and a plurality of moisture absorption patterns are disposed, and an organic layer disposed on the first electrode and a second electrode disposed on the organic layer, thereby improving the reliability of the lighting device.

According to another feature of the present invention, the water-repellent layer may be composed of any one of fluorinated Parylene (AF4), fluorinated silica nanoparticles, and Teflon.

According to another feature of the present invention, the plurality of moisture absorption patterns include MOF (Metal Organic Frameworks), calcium oxide (Cao), zeolite, imogolite, and ceramics (Al ₂ O ₃ , ZrO ₂ ). It can consist of either one.

According to another feature of the present invention, the MOF may be a crystalline material with a skeletal structure with a diameter of 100 nm or less.

According to another feature of the present invention, the plurality of moisture absorption patterns may further include nanoscale filter particles.

According to another feature of the present invention, the thickness of the auxiliary wiring may be thicker than the thickness of the plurality of moisture absorption patterns.

According to another feature of the present invention, it may further include an insulating layer disposed between the first electrode and the organic layer.

According to another feature of the present invention, the thickness of the auxiliary wiring may be the same as the thickness of the plurality of moisture absorption patterns.

According to another feature of the present invention, the first electrode may include a short reduction pattern that implements a narrow path outside the second region.

A lighting device using an organic light emitting device according to an embodiment of the present invention is electrically connected to the first electrode in the first pad portion and electrically connected to the second electrode in the first contact electrode and second pad portion exposed to the outside. and may further include a second contact electrode exposed to the outside.

Although embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and various modifications may be made without departing from the technical spirit of the present invention. . Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

100: lighting device
110: Organic light emitting device unit
120: Encapsulation part
111: substrate
112: Internal light extraction layer
113: Flattening layer
114: barrier layer
115: Water repellent layer
116, 216: moisture absorption pattern, moisture absorption layer
117, 217: first electrode
118: Organic layer
119: second electrode
121: Adhesive layer
122: metal film
123: protective film
130: External light extraction layer
117p: first contact electrode
119p: second contact electrode
AL: Auxiliary wiring
EA: lighting department
PA1: first pad portion
PA2: Second pad section

Claims (10)

Divided into a first area and a second area,
Board;
Water-repellent layer disposed on the substrate
Auxiliary wiring disposed in a first area on the water repellent layer;
a plurality of moisture absorption patterns disposed in a second region on the water repellent layer;
a first electrode disposed on a front surface of the substrate on which the auxiliary wiring and the plurality of moisture absorption patterns are disposed;
an organic layer disposed on the first electrode, and
It includes a second electrode disposed on the organic layer,
The water-repellent layer may be formed of a hydrophobic material,
A lighting device using an organic light emitting device, wherein each of the plurality of moisture absorption patterns includes a getter that absorbs moisture into resin.
According to claim 1,
A lighting device using an organic light-emitting device, wherein the water-repellent layer is composed of any one of fluorinated Parylene (AF4), fluorinated silica nanoparticles, and Teflon.
According to claim 1,
The getter is a lighting device using an organic light-emitting device composed of any one of MOF (Metal Organic Frameworks), calcium oxide (Cao), zeolite, imogolite, and ceramic (Al ₂ O ₃ , ZrO ₂ ). .
According to clause 3,
The MOF is a lighting device using an organic light-emitting device, which is a crystalline material with a skeletal structure of 100 nm or less in diameter.
According to claim 1,
A lighting device using an organic light emitting device, wherein the plurality of moisture absorption patterns further include nanoscale filter particles.
According to claim 1,
A lighting device using an organic light emitting device, wherein the auxiliary wiring has a thickness greater than the thickness of the plurality of moisture absorption patterns.
According to claim 1,
A lighting device using an organic light emitting device, further comprising an insulating layer disposed between the first electrode and the organic layer.
According to claim 1,
A lighting device using an organic light emitting device, wherein the thickness of the auxiliary wiring is the same as the thickness of the plurality of moisture absorption patterns.
According to claim 1,
A lighting device using an organic light emitting device, wherein the first electrode includes a short reduction pattern that implements a narrow path outside the second area.
According to claim 1,
A first contact electrode electrically connected to the first electrode on the first pad and exposed to the outside, and
A lighting device using an organic light emitting device, further comprising a second contact electrode electrically connected to the second electrode on the second pad portion and exposed to the outside.

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