KR20190083474A - A substrate and an organic light emitting diode comprising the same - Google Patents

Abstract

The present application relates to a substrate and organic light emitting diode including the same. According to the present application, the organic light emitting diode with improved light extraction efficiency may be provided. The organic light emitting diode comprises: a transparent substrate; a first light extraction layer positioned on one surface of the transparent substrate; and a second light extraction layer positioned on the other surface of the transparent substrate on which the first light extraction layer is positioned.

Description

[0001] The present invention relates to a substrate and an organic light emitting device including the same,

The present invention relates to a substrate, an organic light emitting element, and a lighting apparatus.

An organic light emitting diode (OLED) including a substrate, a first electrode layer, an organic layer having a light emitting layer, and a second electrode layer sequentially can be manufactured in a thin shape, can be driven at a low voltage, There is a disadvantage in that the light extraction efficiency is not high. The main reason why the light extraction efficiency is low is that light is totally reflected to the inside of the organic light emitting element at the interface between the anode and the substrate having a high refractive index.

The light extracting layer is one of the structures used to improve the deterioration of the light extraction efficiency of the device due to total internal reflection. For example, it is possible to place an inner light extraction layer between an anode such as ITO and a glass, to extract the light confined in the organic layer into a glass, or to place an external light extraction layer on the surface of the glass and suppress total internal reflection of the glass surface And a method of extracting the light inside the glass to the outside. As the inner light extracting layer, a coating layer containing metallic scattering particles is mainly used. As the external light extracting layer, a diffusion film using beads or a structure such as a microlens array (MLA) is used. However, when the inner light extracting layer including scattering particles is present, the light extracting efficiency by the outer light extracting layer is lower than that of the case where the outer light extracting layer is used alone without the inner light extracting layer. However, since the presence of the inner light extraction layer is essential to increase the total light extraction efficiency of the entire device, it is necessary to optimize the outer light extraction in the presence of the inner light extraction layer.

One object of the present invention is to provide a substrate capable of improving the light extraction efficiency of the device, and an organic light emitting device including the same.

The above and other objects of the present application can be all solved by the present application, which is described in detail below.

In one example of the present application, the present application relates to a substrate for an organic light emitting element. The substrate includes a light-transmitting substrate, a first light-extracting layer located on one surface of the light-transmitting substrate, and a second light-extracting layer located on the opposite surface of the light-transmitting substrate surface on which the first light- , The first light extracting layer has a pattern in which projections of a predetermined structure are repeated. In the present application, the term " on " or " on " used in connection with the interlayer deposition position includes not only the case where a certain constitution is formed directly on another constitution but also the case where a third constitution is interposed It can mean to do.

The protrusions of the first light extracting layer may be pyramidal protrusions. A pyramid in the present application may mean a three-dimensional structure in which a plurality of triangular side faces meet at one corner point.

In one example, the height of the protrusion may be less than 500 [mu] m. Specifically, the protrusions may have a height of 400 占 퐉 or less, 300 占 퐉 or less, 300 占 퐉 or less, 200 占 퐉 or less, or 100 占 퐉 or less. If it exceeds the above range, there is a problem that the light transmittance is lowered because the light absorption rate of the projections themselves increases. The lower limit of the height of the projection is not particularly limited, but may be, for example, 10 탆 or more, 20 탆 or more, or 30 탆 or more. When the above range is satisfied, appropriate workability can be ensured.

The protrusion may be an asymmetrical pyramidal protrusion. Specifically, as shown in FIG. 1, the protrusions may be asymmetrical pyramidal protrusions having different slopes of the first and second triangular surfaces facing each other. In the present application, the inclination of the triangular face may mean an angle at which the triangular face, which is the object of inclination measurement, is inclined with respect to the normal line from the horizontal plane of the substrate toward the apex of the pyramidal projection. The first and second triangular surfaces refer to the side surfaces constituting one of the protrusions, and thus the triangular surfaces meet at the apexes of the protrusions. All the pyramidal protrusions included in the first light extracting layer of the present application include arbitrary first triangular plane A and second triangular plane B that satisfy the above relationship when observed in one direction do. In the present application, the side surface of the projection having a smaller inclination with respect to the normal to the apex of the projection may be referred to as a first triangular face. If the protrusion is asymmetric, the light incident from the side of the second light extracting layer of the transparent substrate is moved to the angle range of light that can be reextracted even if the light returns from the first light extracting layer to the second light extracting layer side , The light extraction efficiency can be higher than that in the case where the shape of the projection is symmetrical.

In one example, the angle [alpha] formed by the first and second triangular faces facing each other in the projection may be 45 [deg.] Or less. More specifically, the upper limit of the angle? May be 45 degrees or less, 40 degrees or less, or 35 degrees or less, and the lower limit may be 20 degrees or more, 25 degrees or more, or 30 degrees or more. When the angle formed by the first and second triangular planes is out of the above range, a retroreflection occurs in which light of a specific angle is returned by total internal reflection, resulting in a decrease in light extraction efficiency.

In another example, the inclination [beta] of the first triangular surface may be 15 degrees or less. More specifically, the slope (?) Upper limit of the first triangular plane may be 13 degrees or less or 10 degrees or less, and the lower limit thereof may be more than 0 degrees. If the above range is satisfied, the asymmetric shape of the projections can be ensured, and the light extraction efficiency can be improved because the angle distribution of the light returning to the inside further moves to the angle range where the light can be reextracted.

In another example, an angle? 'Formed by two triangular surfaces having one side in common between adjacent projections contacting each other may be 45 degrees or less. In the present application, the fact that any two protrusions are in contact with each other means that there are no protrusions therebetween, and that any side surface (triangular surface) of two different protrusions has one side in common. For example, as shown in Figure 1, the projections (P ₁₎ comprising: a first triangular face (A ') of the second triangle side (B) and a projection (P ₂₎ that abuts adjacent to the projections (P ₁₎ of the May be less than or equal to 45 [deg.]. More specifically, the angle? 'May have the same size as the angle?. When the above relationship is satisfied, it is possible to eliminate the retroreflection effect occurring in one projection.

The first light extracting layer may have a repeating rule or an irregular pattern of the protrusions of the constitution. In the present application, the fact that the light extracting layer has a regular pattern means that only asymmetrical quadrangular pyramids of the same shape are located on the first light extracting layer, or that the asymmetrical quadrangular pyramids of the same shape have the same interval, Layer < / RTI >

In one example, the interval of the interstices forming the pattern may be 5 占 퐉 or less. For example, when two protrusions are directly adjacent to each other, that is, when no protrusion is present between the two protrusions, a vertical line drawn on one side of one protrusion bottom surface The distance to the nearest side may be 5 占 퐉 or less. If the above range is satisfied, the total internal reflection effect that may be caused by the flat surface can be minimized. That is, the large interval between the protrusions means that the area of the flat surface existing between the protrusions is widened, or the number of flat surfaces located between the protrusions is increased. As in the case where there is no external light extraction layer, Which means more. In consideration of this point, in the present application, the interval between the projections can be controlled within the above-mentioned range to minimize the total internal total reflection.

The asymmetric pyramidal protrusion may have an even number of triangular surfaces. For example, the pyramid may be a quadrangular pyramid, a hexagonal pyramid, or an octagonal pyramid. In the case of a quadrangular pyramid, the workability is excellent, and a light extracting effect can be realized by an easier method.

In one example, the protrusion may have an asymmetrical quadrangular pyramid shape. In the case of a quadrangular pyramid, the bottom surface defined by four triangular planes may be square or rhombic. The protrusions having a quadrangular pyramid shape may include, in addition to the first triangular surface and the second triangular surface, facing each other, a third triangular surface and a fourth quadrilateral surface facing each other. The third triangular plane and the fourth triangular plane are relative names determined by which triangular plane is referred to as the first triangular plane.

The third triangular surface and the fourth triangular surface may have different slopes, and the angle? Formed by the third and fourth triangular surfaces facing each other may be less than 45 degrees. The third triangular surface and the fourth quadrilateral surface may be referred to as a third triangular surface with a smaller inclination with respect to the normal line toward the vertex of the projection. The inclination beta of the third triangular surface may be equal to or smaller than 15 degrees .

3, in the bottom surface defined by the first to fourth triangular surfaces, for example, a protrusion formed by the first triangular surface and the third triangular surface, The internal angle? Of the bottom surface may be 60 to 120 degrees. When the above range is satisfied, the light extraction efficiency can be further increased.

In one example, the first light extracting layer may comprise a curable resin. As the curable resin, a photo-curable resin or a thermosetting resin can be used. As the photocurable resin, an ultraviolet curing resin may be used. The ultraviolet ray curable resin is typically an acrylic polymer such as a polyester acrylate polymer, a polystyrene acrylate polymer, an epoxy acrylate polymer, a polyurethane acrylate polymer or a polybutadiene acrylate polymer, a silicone acrylate polymer or an alkyl acrylate Polymers, and the like, but are not limited thereto. As the thermosetting resin, for example, a silicone resin, a silicon resin, a flan resin, a polyurethane resin, an epoxy resin, an amino resin, a phenol resin, a urea resin, a polyester resin or a melamine resin may be used. But are not limited to resins.

The first light extracting layer may be prepared by applying the above-described curable resin or a composition containing the curable resin on a predetermined substrate, pressing the curable resin layer with the imprinting means having the asymmetric projection shape, and curing . As the imprinting means, it is possible to use an imprinting mold having a shape like the one shown in FIG.

The refractive index of the first light extracting layer is not particularly limited and may be an appropriate value in consideration of the refractive index and extraction efficiency of the adjacent light transmitting substrate. For example, the first light extracting layer and the light-transmitting substrate described below may each have a refractive index in a range of 1 to 3. [

The first light extracting layer may be located on one side of the light transmitting substrate. For example, the protrusion may be located on the interface between the first light extracting layer and the light-transmitting substrate, or the protrusion may be located on one surface of the first light extracting layer opposite to the interface between the first light extracting layer and the light- It may be located.

When the substrate is used for an organic light emitting device, the light transmitting substrate may be located on a path through which light generated from the light emitting layer is emitted to the outside. In the present application, the term "translucent" means that the lower limit of the transmittance for light having a wavelength of about 380 nm to 780 nm is at least 60%, at least 70%, at least 80%, at least 90%, or at least 95% % ≪ / RTI > and less than 100%. The degree of light transmittance can be similarly applied to the light extracting layer of the present application.

The translucent substrate may include a material that satisfies the predetermined transmittance and can impart a predetermined strength to the substrate. For example, as the light transmitting substrate, a glass base layer or a transparent polymer base layer may be used. As the glass base layer, a base layer including soda lime glass, barium / strontium-containing glass, lead glass, aluminosilicate glass, borosilicate glass, barium borosilicate glass or quartz can be used. As the polymer base layer, PI a substrate layer containing polyimide, PEN (polyethylene naphthalate), PC (polycarbonate), acrylic resin, poly (ethylene terephthalate), PES (poly sulfide) , But are not limited to the materials listed above.

And the second light extracting layer is located on the opposite surface of the light transmitting substrate on which the first light extracting layer is located. The second light extracting layer may be a coating layer including scattering particles and a binder.

The refractive index of the second light extracting layer is not particularly limited. In one example, the refractive index of the second light extracting layer binder may be larger than that of the light-transmitting substrate, and may be similar to the refractive index of the light-emitting layer described below. The refractive index of the second light extracting layer may be appropriately selected within a range of 1 to 3.

In the present application, " scattering particles " may mean particles which have a refractive index different from that of a binder used together in the light extracting layer, and which have an appropriate size and can scatter incident light. These particles preferably have a refractive index of about 1.0 to 3.5, for example, about 1.0 to 2.0 or about 1.2 to 1.8, or about 2.1 to 3.5 or 2.2 to 3.0, and have an average particle diameter of 50 nm to 20,000 nm or 100 nm to 5,000 nm can be exemplified. The scattering particle may have a shape such as a sphere, an ellipse, a polyhedron or an amorphous shape, but the shape is not particularly limited. Examples of the scattering particles include organic materials such as polystyrene or a derivative thereof, an acrylic resin or a derivative thereof, a silicone resin or a derivative thereof, or a novolak resin or a derivative thereof, or an organic material such as silica, alumina, titanium oxide or zirconium oxide Particles including an inorganic material can be exemplified. The scattering particles may be formed of only one of the above materials, or may be formed of two or more of the above materials, and if necessary, may be formed of particles in the form of core / shell or particles in the form of hollow particles .

In one example, the content of the scattering particles may be in the range of about 5 to 20 parts by weight based on 100 parts by weight of the total resin used for forming the second light extracting layer, but is not particularly limited thereto.

As the binder for holding the scattering particles in the second light extracting layer, for example, a material having a refractive index equivalent to that of the light-transmitting substrate can be used. Specifically, thermally or photo-curable monomeric, oligomeric or polymeric organic materials such as polyimide, a caldo resin having a fluorene ring, a urethane, an epoxide, a polyester or an acrylate series, An inorganic material such as silicon nitride, silicon oxynitride or polysiloxane, or an organic composite material may be used.

In another example of the present application, the present application relates to an organic light emitting device. The device may include a substrate, a first electrode layer sequentially disposed on the substrate, an organic layer including a light emitting layer, and a second electrode layer. The configuration and other characteristics of the substrate are the same as those described above

In one example, a typical hole injecting or electron injecting electrode layer used for manufacturing an organic light emitting device may be formed as the electrode layer.

The hole injecting electrode layer can be formed using, for example, a material having a relatively high work function, and can be formed using a transparent material when necessary. For example, the hole-injecting electrode layer may comprise a metal, an alloy, an electrically conductive compound or a mixture of two or more thereof having a work function of about 4.0 eV or more. As such a material, metal such as gold, CuI, indium tin oxide (ITO), indium zinc oxide (IZO), zinc tin oxide (ZTO), zinc oxide doped with aluminum or indium, magnesium indium oxide, nickel tungsten oxide, Metal oxides such as ZnO, SnO 2 or In 2 O 3, metal nitrides such as gallium nitride, metal serenides such as zinc serenide, and metal sulfides such as zinc sulfide. The transparent positive hole injecting electrode layer can also be formed by using a metal thin film of Au, Ag or Cu and a laminate of a transparent material of high refractive index such as ZnS, TiO 2 or ITO.

The hole injecting electrode layer may be formed by any means such as vapor deposition, sputtering, chemical vapor deposition or electrochemical means. In addition, the electrode layer formed according to need may be patterned through a process using known photolithography, shadow mask, or the like. The film thickness of the hole injecting electrode layer varies depending on the light transmittance, the surface resistance, and the like, but may be usually in the range of 500 nm or 10 nm to 200 nm.

The electron injecting transparent electrode layer can be formed using, for example, a transparent material having a relatively small work function. For example, a material suitable for forming the hole injecting electrode layer can be formed using a suitable material But is not limited thereto. The electron injecting electrode layer can also be formed using, for example, a vapor deposition method or a sputtering method, and can be appropriately patterned when necessary. The electron injecting electrode layer may be formed to have an appropriate thickness as required.

The organic layer may include at least one light emitting layer. The organic layer may include a plurality of light emitting layers of two or more layers. When the light emitting layer includes two or more light emitting layers, the light emitting layers may have a structure in which the light emitting layers are divided by an intermediate electrode having charge generating characteristics, a charge generating layer (CGL) or the like, but the present invention is not limited thereto.

The light-emitting layer can be formed, for example, by using various fluorescent or phosphorescent organic materials known in the art. As a material that can be used for the light emitting layer, tris (4-methyl-8-quinolinolate) aluminum (III) (aluminum (III) , C-545T (C ₂₆ H ₂₆ N ₂ O ₂ S), DSA-amine, TBSA, BTP, PAP-NPA, Spiro-FPA, Ph ₃ Si (PhTDAOXD ), Cyclopenadiene derivatives such as PPCP (1,2,3,4,5-pentaphenyl-1,3-cyclopentadiene), DPVBi (4,4'-bis (2,2'- diphenylyinyl) -1 , 1'-biphenyl), distyrylbenzene or a derivative thereof or DCJTB (4- (Dicyanomethylene) -2-tert-butyl-6- (1,1,7,7-tetramethyljulolidyl- ), DDP, AAAP, NPAMLI; Or Firpic, m-Firpic, N- Firpic, bon 2 Ir (acac), (C 6) 2 Ir (acac), bt 2 Ir (acac), dp 2 Ir (acac), bzq 2 Ir (acac), bo _{2 Ir (acac), F 2} Ir (bpy), F 2 Ir (acac), op 2 Ir (acac), ppy 2 Ir (acac), tpy 2 Ir (acac), FIrppy (fac-tris [2- ( ( ₂ , 4'-difluorophenyl) pyridine-C'2, N] iridium (III) or Btp ₂ Ir (acac) C3 '-) iridium (acetylacetonate), and the like, but the present invention is not limited thereto. The light emitting layer may contain the above material as a host and may also include perylene, distyrylbiphenyl, DPT, quinacridone, rubrene, BTX, ABTX or DCJTB. And may have a host-dopant system including a dopant.

The light-emitting layer can be formed by suitably employing a kind that exhibits luminescence characteristics among electron-accepting organic compounds or electron-donating organic compounds described below.

The organic layer may be formed with various structures, including various other functional layers known in the art, as long as the layer includes a light emitting layer. Examples of the layer that can be included in the organic layer include an electron injecting layer, a hole blocking layer, an electron transporting layer, a hole transporting layer, and a hole injecting layer.

The electron injection layer or the electron transport layer can be formed using, for example, an electron accepting organic compound. As the electron-accepting organic compound in the above, any known compound can be used without any particular limitation. Examples of such organic compounds include polycyclic compounds or derivatives thereof such as p-terphenyl or quaterphenyl, naphthalene, tetracene, pyrene, coronene, ), Polycyclic hydrocarbon compounds or derivatives thereof such as chrysene, anthracene, diphenylanthracene, naphthacene or phenanthrene, phenanthroline, Heterocyclic compounds or derivatives thereof such as bathophenanthroline, phenanthridine, acridine, quinoline, quinoxaline, or phenazine may be exemplified. It is also possible to use at least one of fluoroceine, perylene, phthaloperylene, naphthaloperylene, perynone, phthaloferrinone, naphthoferrinone, diphenylbutadiene ( diphenylbutadiene, tetraphenylbutadiene, oxadiazole, aldazine, bisbenzoxazoline, bisstyryl, pyrazine, cyclopentadiene, and the like. Oxine, aminoquinoline, imine, diphenylethylene, vinyl anthracene, diaminocarbazole, pyrane, thiopyrane, polymethine, Quinacridone or rubrene or derivatives thereof, Japanese Patent Application Laid-Open No. 1988-295695, Japanese Patent Application Laid-Open No. 1996-22557, Japanese Patent Application Laid-Open No. 1996-81472, Japanese Patent Application Laid-Open No. 1993-009470 or Japanese Patent Application Laid- For example, tris (8-quinolinolato) aluminum, which is a metal chelated oxanoid compound, bis (8-quinolinolato) aluminum, Bis (benzo (f) -8-quinolinolato] zinc}, bis (2-methyl-8-quinolinolato) aluminum, Tris (8-quinolinolato) indium], tris (5-methyl-8-quinolinolato) aluminum, 8- quinolinolato lithium, tris (5- Quinolinolato) gallium, bis (5-chloro-8-quinolinolato) calcium and the like, metal complexes having at least one of 8-quinolinolato or a derivative thereof as an arbiter, Japanese Patent Laid- Oxadiazole compounds disclosed in Japanese Patent Application Laid-Open Nos. 1995-179394, 1995-278124, and 1995-228579, Stilbene derivatives, distyrylarylene derivatives, and the like disclosed in Japanese Patent Application Laid-Open (kokai) No. 1994-132080 Styryl derivatives disclosed in JP-A-1994-88072 and the like, diolefin derivatives disclosed in JP-A-1994-100857 and JP-A-1994-207170, and the like; Fluorescent brightening agents such as benzooxazole compounds, benzothiazole compounds or benzoimidazole compounds; Bis (4-methylstyryl) benzene, distyrylbenzene, 1,4-bis (2-methylstyryl) benzene, Bis (2-methylstyryl) benzene, 1,4-bis (3-ethylstyryl) benzene, Methylstyryl) -2-ethylbenzene, and the like; Bis (4-methylstyryl) pyrazine, 2,5-bis (4-methylstyryl) pyrazine, 2,5- Bis [2- (4-biphenyl) vinyl] pyrazine such as bis (4-methoxystyryl) pyrazine, 2,5-bis [2- Distyrylpyrazine compounds, 1,4-phenylenedimethylidene, 4,4'-phenylenedimethylidyne, 2,5-xylenedimethylidyne, 2,6-naphthylenedimethylidyne, 1,4-biphenylene dimethyl (9,10-anthracenediyldimethylidine) or 4,4 '- (2,2-di-t-butylphenylvinyl) biphenyl , Dimethylidine compounds such as 4,4 '- (2,2-diphenylvinyl) biphenyl and derivatives thereof, silane disclosed in Japanese Patent Application Laid-Open No. 1994-49079 or Japanese Patent Application Laid-Open No. 1994-293778 Silanamine derivatives, Japanese Patent Application Laid-Open No. 1994-279322 or Japanese Patent Laid-Open Publication No. 1994-279323 Oxadiazole derivatives disclosed in Japanese Patent Laid-Open Publication No. 1994-109264, Japanese Patent Laid-Open Publication No. 1994-206865 and the like, an anthracene compound disclosed in Japanese Patent Oxynate derivatives disclosed in JP-A-1994-145146 and the like, tetraphenylbutadiene compounds disclosed in JP-A-1992-96990 and the like, organic trifunctional compounds disclosed in JP-A-1991-296595, Coumarin derivatives disclosed in JP-A-1990-191694 and the like, perylene derivatives disclosed in JP-A-1990-196885 and the like, naphthalene derivatives disclosed in JP-A-1990-255789, Phthaloperynone derivatives disclosed in JP-A No. 1990-289676 or JP-A No. 1990-88689 or a derivative of phthaloperynone derivatives disclosed in JP-A No. 1990-25029 Styrylamine derivatives disclosed in, for example, Japanese Patent Laid-open Publication No. 2 (1990) can also be used as electron-accepting organic compounds contained in the low refractive layer. In addition, the electron injection layer may be formed using a material such as LiF or CsF.

The hole blocking layer prevents the injected holes from entering the electron injecting electrode layer through the light emitting layer to improve the lifetime and efficiency of the device. If necessary, the hole blocking layer can be formed using a known material, As shown in FIG.

The hole injecting layer or the hole transporting layer may include, for example, an electron donating organic compound. Examples of the electron donating organic compound include N, N ', N'-tetraphenyl-4,4'-diaminophenyl, N, N'- N, N ', N'-tetra-p-tolyl-4,4'-diaminobiphenyl, Phenyl, N, N'-di (4-methoxyphenyl) -4,4'-diaminobiphenyl, N, N'- (N, N ', N'-tetraphenyl-4,4'-diaminodiphenyl ether, 4,4'-bis (diphenylamino) quadriphenyl] 4-N, N-diphenylaminostilbene, N-phenylcarbazole, 1,1-bis (4-methoxy- Bis (4-dimethylamino-2-methylphenyl) phenylmethanesulfonate, 1,1-bis (4-di- N, N, N-tri (p-tolyl) amine, 4- (di-p- tolylamino) -4 ' N ', N'-tetraphenyl-4,4'-diaminobis N-phenylcarbazole, 4,4'-bis [N- (1-naphthyl) -N-phenylamino] biphenyl, Phenylamino] biphenyl, 4,4'-bis [N- (3-acenaphthenyl) -N (2-naphthyl) Phenylamino] biphenyl, 1,5-bis [N- (1-naphthyl) -N-phenylamino] naphthalene, 4,4'- Bis [N- (2-phenanthryl) -biphenylphenylamino] biphenyl, 4,4'-bis [N- N-phenylamino] biphenyl, 4,4'-bis [N- (2-pyrenyl) - N-phenylamino] biphenyl, 4,4'-bis [N- (1-choronenyl) - N-phenylamino] biphenyl), 2,6-bis (di-p-tolylamino) naphthalene, 2,6-bis (1-naphthyl) amino] naphthalene, 2,6-bis [N- (1-naphthyl) Bis [N, N-di (2-naphthyl) amino] terphenyl, 4,4'-bis { Bis [N, N-di- (2-naphthyl) amino] fluorene or 4,4'-bis (N, N-di-p-tolylamino) terphenyl and bis (N-1-naphthyl) (N-2-naphthyl) amine and the like are exemplified. It is not.

The hole injecting layer or the hole transporting layer may be formed by dispersing the organic compound in the polymer, or by using a polymer derived from the organic compound. Furthermore, hole-transporting non-conjugated polymers such as π-conjugated polymers and poly (N-vinylcarbazole) such as polyparaphenylenevinylene and derivatives thereof, σ conjugated polymers of polysilane, and the like can also be used have.

The hole injection layer may be formed by using a metal phthalocyanine such as copper phthalocyanine, a nonmetal phthalocyanine, a carbon film and an electrically conductive polymer such as polyaniline or by reacting the arylamine compound with an Lewis acid using the arylamine compound as an oxidizing agent You may.

In another example related to the present application, the present application provides a display device including the organic light emitting element. In the display device, the organic light emitting element may serve as a pixel or a backlight. In addition, configurations of the display device can be applied to those known in the related art.

In another example of the present application, the present application provides a lighting apparatus including the organic light emitting element. In the illumination device, the organic light emitting element plays a role of a light emitting portion. In addition, configurations necessary for the illumination device can be applied to those known in the art.

According to an example of the present application, an organic light emitting device having improved light extraction efficiency can be provided.

1 schematically shows a cross-section of a first light extracting layer viewed from either direction when an asymmetric quadrangular pyramid is used in the first light extracting layer, according to an example of the present application.
Figure 2 shows the shape of the bite for making an imprinting mold that can be used to form the first light extraction layer used in the present application substrate.
3 is a schematic view for explaining the shape of the first light extracting layer projection according to an example of the present application.
Fig. 4 shows the shape of the first light extracting layer used in Example 1. Fig.
Fig. 5 shows the shape of the first light extracting layer used in Example 2. Fig.
Fig. 6 shows the shape of the first light extracting layer used in Example 3. Fig.

Hereinafter, the present application will be described in detail by way of examples. However, the scope of protection of the present application is not limited by the embodiments described below.

Example 1

Basic device structure

The simulation was performed using ZEMAX S / W of Zemax LLC. For the simulation, a simpler model than the actual lighting was applied. Specifically, the device was simplified to include a glass substrate having a refractive index of 1.525, an internal light extracting layer having a refractive index of 1.75, an organic light emitting layer having a refractive index of 1.75, and an aluminum reflecting layer. The scattering characteristics of the inner light extraction layer were ZEMAX 's own angular scatter model. The parameters were MFP 0.0015, angle 45, absorption rate 10%.

External light extraction layer modeling

A pattern in which protrusions of an asymmetrical quadrangular pyramid shape are arranged on a glass substrate, that is, an external light extracting layer, is applied. Specifically, the refractive index of the asymmetrical quadrangular pyramid was 1.54, the bottom shape was square, the vertex angle? Was 40 占 and the inclination? Of the first triangular face was 5 占. The shape of the light extracting layer is shown in Fig.

Example 2

The device having the same structure as that of the first embodiment is modeled, except that the bottom shape of the asymmetrical quadrangular pyramid is rhombic, and the angle? Of the bottom internal angle formed by the first triangular face and the third triangular face is 120 占The extraction efficiency was calculated. The shape of the light extracting layer is shown in Fig.

Example 3

The device having the same structure as that of the first embodiment is modeled, except that the bottom shape of the asymmetrical quadrangular pyramid is rhombus and the angle? Of the bottom internal angle formed by the first triangular face and the third triangular face is 60 degrees. The extraction efficiency was calculated. The shape of the light extracting layer is shown in Fig.

Comparative Example 1

The light extraction efficiency was calculated using the basic device modeled in Example 1.

Comparative Example 2

The light extraction efficiency was calculated in the same manner as in Example 1, except that another structure was used instead of the pattern (external light extraction layer). Specifically, a microlens array (MLA) having a pattern refractive index of 1.54 was applied on the basic device structure modeled in Example 1. The microlenses were hemispherical with a diameter of 28 탆 and arranged in a honeycomb structure at intervals of 2 탆.

Comparative Example 3

Except that the film (external light extracting layer) having a protrusion pattern of a pyramid-shaped symmetrical quadrangular pyramid having a vertex angle of 90 ° and a square bottom was applied to the outer surface of the base element glass substrate used in Comparative Example 1, The device was modeled in the same way as in (1), and the light extraction efficiency was calculated.

Comparative Example 4

Except that a film (external light extracting layer) having a projecting pattern of a pyramid-shaped symmetrical quadrangular pyramid having a vertex angle of 65 ° and a square bottom was applied to the outer surface of the base element glass substrate used in Comparative Example 1 The device was modeled in the same manner as in Example 1, and the light extraction efficiency was calculated.

Comparative Example 5

The device was modeled in the same manner as in Example 1, except that a protrusion pattern, which is a pyramid-shaped symmetrical quadrangular pyramid having a vertex angle of 40 ° and a square bottom, was applied to the outer surface of the glass substrate of the device used in Comparative Example 1 , And the light extraction efficiency was calculated.

Comparison of light extraction efficiency

For the Examples and Comparative Examples, the light extraction efficiency was calculated using ZEMAX S / W of Zemax LLC. The results are shown in Table 1 below.

[Table 1]

Claims (10)

Translucent substrate; A first light extracting layer located on one surface of the light transmitting substrate; And a second light extracting layer located on the opposite surface of the one surface of the translucent substrate on which the first light extracting layer is located,
Wherein the first light extracting layer has a repetitive pattern of asymmetrical pyramidal protrusions having different slopes of a first triangular face and a second triangular face facing each other. The substrate for an organic light emitting device according to claim 1, wherein an angle (?) Formed by the first triangular surface and the second triangular surface facing each other in the projection is 45 占 or less. The substrate according to claim 2, wherein a slope of the first triangular surface of the protrusion is 15 ° or less. 4. The method according to claim 3, wherein the angle? 'Formed by the first triangular surface of one of the projections and the second triangular surface of the adjacent other projections in contact with the projections is less than or equal to 45 and the angle? 'Are the same for a substrate for an organic light emitting element. The organic light emitting device substrate according to claim 1, wherein the protrusion is a quadrangular pyramid having a square or rhomboid bottom surface. 6. The substrate according to claim 5, wherein the bottom surface has an internal angle of 60 DEG to 120 DEG. The organic light-emitting device substrate according to claim 1, wherein the interval between the protrusions is 5 占 퐉 or less. The substrate according to claim 1, wherein the second light extracting layer comprises a binder and scattering particles. A substrate according to claim 1; A first electrode layer sequentially formed on the substrate; An organic layer including a light emitting layer; And a second electrode layer. A lighting device comprising the organic light-emitting device according to claim 9.

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