JP2018063749A - Scattering film for organic el and organic el light-emitting device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scattering film for an organic EL which can prevent color difference and has excellent light extraction efficiency.SOLUTION: Provided is a scattering film arranged on a light-emitting surface of an organic EL light-emitting device. The scattering film comprises a scattering layer which contains: binder resin; and resin particles scattered in the binder resin. The resin particles have an average particle size which exceeds 1 μm but is equal to or smaller than 10 μm. When a refractive index of the binder resin after curing is described as n2, a refractive index n1 of the resin particles satisfies the following equation: |n1-n2|≤0.05. The resin particles contained in 100 pts.wt. of the binder resin exceeds 100 pts.wt. but is less than 160 pts.wt.SELECTED DRAWING: None

Description

  The present invention relates to a scattering film used in an organic EL light emitting device.

  Conventionally, there is an organic EL light emitting device that emits light by supplying a voltage to an organic electroluminescence (organic EL) element having a light emitting layer sandwiched between an anode (transparent electrode) and a cathode (back electrode). Organic EL light-emitting devices have advantages such as light weight, thinness, and low power consumption, and thus are used as backlights for liquid crystal displays and flat illumination devices (Patent Document 1).

  The organic EL light-emitting device has the above-described excellent features, but also has problems as described below.

  That is, an organic thin film layer such as an organic light emitting layer constituting the organic EL light emitting device or a support provided with the organic thin film layer has a higher refractive index than air, and therefore, total reflection at the interface of emitted light tends to occur. Therefore, the light use efficiency is less than 20% of the total, and most of the light is lost.

  Further, the organic EL light emitting device has a problem of viewing angle dependency. Specifically, the light-emitting layer of the organic EL light-emitting device is composed of a combination of a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer. When the light emitting surface is viewed from an oblique direction, light is separated for each wavelength at the interface between the light emitting layers. When the wavelength of light is separated, the optical path length changes between the light emitting layers, and the hue changes depending on the viewing angle. For example, if the organic EL light emitting device is viewed from the front direction, there is almost no change in the light path length, so there is almost no change in the light emission color of the organic EL light emitting device. Will change the hue.

  In order to solve such a problem of the organic EL light emitting device, it is conceivable to use a light diffusing film that is generally used for making the light source pattern difficult to see or increasing the viewing angle in the light source device or the like. . However, normal light diffusing films place emphasis on light diffusion and front luminance improvement as required performance, so that when applied to organic EL light emitting devices, sufficient light utilization efficiency can be improved. Can not.

  On the other hand, as a scattering film suitable for an organic EL light emitting device, a scattering film having a scattering layer containing a binder resin and particles having a difference in refractive index has been proposed (Patent Documents 1 and 2). These scattering films can obtain a high color difference suppressing effect even with a relatively small particle content by using particles having a large refractive index difference from the binder resin as a scattering material.

JP 11-329742 A JP 2009-110930 A

  However, when scattering particles having a large refractive index difference from the binder resin are used, there is a disadvantage in that the light extraction efficiency is inferior compared to using scattering particles having a small or no refractive index difference from the binder resin. . On the other hand, in the case of particles having a small refractive index difference with the resin, it is necessary to increase the content in order to obtain the same color difference suppressing effect as particles having a large refractive index difference, and if the content increases, the light extraction efficiency increases. It is thought to decline. That is, there is a trade-off relationship between color difference suppression and light extraction efficiency, and it is difficult to satisfy both.

  On the other hand, the present applicant intends to suppress color difference and improve light extraction efficiency by combining two types of particles, that is, fine particles having a difference in refractive index with resin and particles having a larger average particle diameter. Propose that. However, in this case, it is necessary to manage two types of particles as a material, and in order to obtain an optimum effect, it is necessary to optimize the ratio of these two types of particles.

  This invention makes it a subject to provide the scattering film for organic EL which can suppress a color difference and has favorable light extraction efficiency using one type of light-scattering particle | grains.

  In order to solve the above problems, the present inventors have found that the scattering resin particles having a refractive index difference with a binder resin in a predetermined small range have the best content in both color difference suppression and light extraction efficiency. The present inventors have found that there is a range and have arrived at the present invention.

  That is, the scattering film for organic EL of the present invention is a scattering film disposed on the light emitting surface of an organic EL light emitting device, and includes a binder resin and a scattering layer including resin particles dispersed in the binder resin. The resin particles have an average particle diameter of more than 1 μm and less than 10 μm, and a refractive index n1 of | n1−n2 | ≦ 0.05, where n2 is a refractive index after curing of the binder resin. And 100 parts by weight or more and 160 parts by weight or less with respect to 100 parts by weight of the binder resin.

  In addition, the organic EL light emitting device of the present invention includes a pair of electrodes and a light emitting layer provided between the pair of electrodes, and is scattered on the light emitting side of the electrode serving as the light emitting side of the pair of electrodes. A scattering film is provided, wherein the scattering film is the scattering film of the present invention.

  According to the present invention, it is possible to achieve both improvement in light utilization efficiency and suppression of color difference while using one kind of light scattering particles.

(A), (b) is sectional side view which shows an example of the scattering film for organic electroluminescent light emitting devices of this invention, respectively. Side sectional view showing an example of the organic EL light emitting device of the present invention

  Hereinafter, embodiments of the scattering film for organic EL of the present invention (hereinafter sometimes referred to as “scattering film”) will be described.

  The scattering film for organic EL of the present invention includes a scattering layer, and the structure may be composed of a scattering layer alone, or may include a support and other layers. In FIG. 1, the structural example of the scattering film 10 of this invention is shown. FIG. 1A shows a scattering film in which a scattering layer 12 is formed on a support 11, and FIG. 1B shows a scattering film composed of a single layer of the scattering layer 12. In any case, the scattering layer 12 includes a binder resin and resin particles.

Hereinafter, the elements constituting the scattering layer, mainly the binder resin and the resin particles will be described.
As the binder resin contained in the scattering layer of the present invention, a resin excellent in optical transparency can be used. For example, polyester resin, acrylic resin, acrylic urethane resin, polyester acrylate resin, polyurethane acrylate resin, epoxy acrylate resin, urethane resin, epoxy resin, polycarbonate resin, cellulose resin, acetal resin, polyethylene It is possible to use thermoplastic resins, thermosetting resins, ionizing radiation curable resins, and the like such as resin, polystyrene resin, polyamide resin, polyimide resin, melamine resin, phenol resin, and silicone resin. In particular, thermosetting resins and ionizing radiation curable resins excellent in coating film hardness and weather resistance are preferable, and acrylic resins are particularly preferably used from the viewpoint of weather resistance and optical properties among the above-described resins.

  The refractive index n2 of the binder resin is not particularly limited as long as it satisfies a predetermined range in relation to the refractive index of the resin particles described later. From the viewpoint of light extraction, the scattering film of the present invention is used as an organic EL device. It is preferable that the relationship between the refractive index of the material overlapping with the scattering film is a relationship in which the refractive index decreases in the light extraction direction. For example, the refractive index of the upper electrode serving as the light extraction surface of the organic EL device on which the scattering film is stacked is na, the refractive index of the member stacked on the upper side of the scattering film, or the refractive index of air when there is no such member. It is preferable that the relationship is na> n2> nb. Specifically, those having a value of about 1.4 to 1.65 are used.

  Next, the resin particles contained in the scattering layer of the present invention form a concavo-convex shape on the surface of the scattering layer, and emits the amount of light that could not be emitted by conventional total reflection, thereby improving the light utilization efficiency. Used for. The uneven shape can be formed by inorganic particles, but resin particles have higher light transmittance than inorganic particles, and light absorption by the particles is extremely small, so that the light utilization efficiency is improved as a whole. be able to.

  The resin particles contained in the scattering layer of the present invention have a refractive index difference of 0.05 or less with respect to the refractive index of the binder resin. Either the resin particles or the binder resin may be high in the refractive index. That is, the refractive index n1 of the resin particles satisfies the condition of | n1-n2 | ≦ 0.05, where n2 is the refractive index after curing of the binder resin. Preferably, those having a refractive index difference (| n1-n2 |) of 0.04 or less are used. The lower limit of the refractive index difference is preferably 0.01 or more. By using a predetermined amount of the binder resin having a refractive index difference in a predetermined range, the viewing angle dependency can be improved while maintaining high light extraction efficiency.

  Specific examples of the resin particles include silicone resin particles, acrylic resin particles, nylon resin particles, styrene resin particles, acrylic styrene resin particles, polyethylene particles, benzoguanamine resin particles, urethane resin particles, and melamine resin particles. In particular, as a combination in which the difference in refractive index from the binder resin is in the above range, for example, acrylic resin (1.50) and acrylic resin particles (1.49), acrylic resin (1.50) and nylon resin particles ( 1.53), epoxy resin (1.55), polyethylene resin particles (1.53), and the like (the refractive index of the material is in parentheses).

  The average particle diameter of the resin particles is more than 1 μm and less than 10 μm. In particular, the average particle size is preferably 6 μm or less. Moreover, it is preferable that an average particle diameter is 3 micrometers or more. By setting the average particle diameter of the resin particles to a relatively small value, the surface of the scattering layer has a fine convex shape of about several μm, and the viewing angle dependency can be improved. Incidentally, when the average particle diameter of the resin particles exceeds 10 μm, it is not preferable because the light from the EL light emitting layer cannot be appropriately scattered and the viewing angle dependency is deteriorated. Further, when the average particle diameter of the resin particles is 1 μm or less, the light utilization efficiency is lowered and the viewing angle dependency tends to be deteriorated. In addition, the average particle diameter as used in the field of this invention means the value computed by the Coulter counter method.

  In the scattering layer of the present invention, the content ratio of the resin particles to the binder resin is preferably such that the resin particle content is 100 parts by weight or more with respect to 100 parts by weight of the binder resin in order to improve the viewing angle dependency. 120 parts by weight or more is more preferable. In order not to reduce the light extraction efficiency, the content of particles with respect to 100 parts by weight of the binder resin is set to 160 parts by weight or less.

  In addition to the binder resin and particles described above, the scattering layer includes a crosslinking agent, a colorant, an antistatic agent, a flame retardant, an antibacterial agent, an antifungal agent, an ultraviolet absorber, and a light stabilizer as long as these functions are not impaired. , Antioxidants, plasticizers, leveling agents, dispersants, flow regulators, antifoaming agents and the like.

  The thickness of the scattering layer is preferably 3 to 15 μm from the viewpoint of easily preventing the curling when the scattering film is formed.

  As shown in FIG. 1A, when the scattering film of the present invention is provided with a scattering layer on a support, the support is particularly limited as long as it is a light-transmitting material. Various things can be used without it. For example, polyester resin, acrylic resin, acrylic urethane resin, polyester acrylate resin, polyurethane acrylate resin, epoxy acrylate resin, urethane resin, epoxy resin, polycarbonate resin, cellulose resin, acetal resin, One or more of vinyl resin, polyethylene resin, polystyrene resin, polypropylene resin, polyamide resin, polyimide resin, melamine resin, phenol resin, silicone resin, fluorine resin, cyclic olefin, etc. A transparent plastic film mixed with can be used. Of these, a stretched polyethylene terephthalate film, particularly a biaxially stretched film, is preferred because of its excellent mechanical strength and dimensional stability. Moreover, in order to improve adhesiveness with a scattering layer, what gave the surface a corona discharge process or provided the easily bonding layer is used suitably. In addition, it is preferable that the thickness of a support body is about 10-400 micrometers normally.

  Moreover, you may give an antireflection process in order to improve the light transmittance to the surface on the opposite side to the uneven | corrugated surface of the scattering film surface of this invention. Furthermore, an antistatic layer or an adhesive layer may be provided.

  When the scattering film of the present invention is produced by a coating method, a coating solution for a scattering layer in which materials such as the binder resin and resin particles described above are dissolved in an appropriate solvent is applied to a conventionally known method such as a bar coater. It can be produced by coating on a support by a blade coater, spin coater, roll coater, gravure coater, flow coater, die coater, spray, screen printing or the like and drying.

  In the case of a scattering film consisting of a single scattering layer, a scattering film consisting of a single scattering layer can be prepared by peeling off the support from the above-mentioned scattering layer formed on the support. . Alternatively, a scattering film can be produced by molding a resin composition containing resin particles in a binder resin into a film shape.

  Next, the organic EL light emitting device of the present invention will be described. The organic EL light emitting device of the present invention is obtained by attaching the above-described scattering film of the present invention to the light emitting surface side, and the other structure is the same as that of a known organic EL light emitting device.

  FIG. 2 shows an example of the organic EL light emitting device 20. The organic EL light emitting device 20 includes a support 24 made of a transparent polymer resin, glass, or the like, and includes an anode (transparent electrode) 21 and a cathode (back electrode) 22, and a light emitting layer 23 between the anode 21 and the cathode 22. The scattering layer 25 is provided on the support 24 of the anode 21 on the light emitting side.

As the transparent electrode 21, a conductive metal oxide such as SnO ₂ , In ₂ O ₃ , or ITO can be used. The cathode 22 can be made of a highly reflective metal such as Al, Ag, or Mo or an alloy. These electrodes 21 and 22 can be formed by a known method such as vapor deposition, sputtering, or ion plating.

  As a material constituting the light emitting layer 23, a known organic light emitting material or a doping material is used. In order to obtain white light emission, a plurality of light emitting layers having different emission colors (for example, a red light emitting layer, a blue light emitting layer, and a green light emitting layer) are used. Layer) 23 can be combined. As a method of combining the plurality of light emitting layers 23, a plurality of layers may be stacked, or the light emitting surface of the light emitting device may be divided into fine regions, and the plurality of light emitting layers may be arranged in a mosaic pattern. When a plurality of layers are stacked, a transparent electrode can be inserted between adjacent light emitting layers, and a voltage can be applied to each light emitting layer. It is also possible to realize white light emission by combining a light emitting layer that emits a single color and a phosphor layer. The present invention can be applied to all these types of light emitting devices.

  In addition to the light emitting layer, the organic EL light emitting device may include a hole injection layer, a hole transport layer, an electron injection layer, an electron transport layer, a barrier layer, and the like. Examples of materials constituting these layers include polythiophene-polystyrene sulfonic acid (PEDOT / PSS) (hole injection layer), triphenylamine derivative (hole transport layer), thyllium fluoride (electron injection layer), and oxadiazole. Known materials such as a derivative (electron transport layer) and silicon nitride (barrier layer) are used, and each can be formed by a known method such as vapor deposition.

  The support 24 is made of a transparent resin film or glass plate.

  The scattering layer 25 extracts the light emitted from the light emitting layer 23 through the support 24 and scatters the light to improve the viewing angle dependency. The organic EL light emitting device 20 of the present invention uses a scattering film composed of the single scattering layer 12 of the present invention shown in FIG. Or as the support body 24 and the scattering layer 25, you may use the scattering film 10 in which the scattering layer 12 was formed on the support body 11 shown to Fig.1 (a). Further, the scattering film 10 provided with the support 11 can be used as the scattering layer 25. In any case, the scattering film 10 is preferably arranged so that the surface on which the unevenness is formed by the resin particles becomes the light exit surface. As a method of providing the scattering film 10 on the light emitting side of the organic EL light emitting device, the scattering film 10 may be directly attached to the light emitting side through a transparent adhesive layer or an adhesive layer, It is also possible to directly laminate the material constituting the scattering layer on the outermost layer by a coating method or the like.

  The organic EL light-emitting device of the present invention is provided with a specific scattering layer on the light exit surface side, so that the light use efficiency is high and the viewing angle dependency can be improved.

  The following examples further illustrate the present invention. “Parts” and “%” are based on weight unless otherwise specified.

1. Production of scattering film <Experimental example 1: Difference in particle diameter>
[Example 1]
After mixing and stirring the coating solution for the scattering layer of the following formulation, it was applied on a support made of a polyethylene terephthalate film (Lumirror T60: Toray) with a thickness of 100 μm by a bar coating method so that the thickness after drying was 8 μm. Then, a scattering layer was formed by drying, and the scattering film of Example 1 was obtained.

<Coating liquid for scattering layer of Example 1>
・ Acrylic polyol 124 parts (Acridic 52-666: DIC, solid content 50%)
-Isocyanate-based curing agent 63.3 parts (Takenate D110N: Mitsui Chemicals, solid content 60%)
-150 parts of acrylic resin particles (Gantz Pearl GM-0407S: Gantz Kasei Co., Ltd. average particle size 4 μm, refractive index 1.49)
・ Dilute solvent 912 parts

  The refractive index after curing of the resin (acrylic polyol and isocyanate curing agent) used for the scattering layer was 1.50.

[Example 2]
In the same manner as in Example 1, except that the acrylic resin particles in the scattering layer used in Example 1 were changed to Gantz Pearl GM-0607S (Gantz Kasei Co., Ltd., average particle diameter 6 μm, refractive index 1.49) 2 scattering films were obtained.

[Reference Example 1]
A reference example was obtained in the same manner as in Example 1 except that the acrylic resin particles in the scattering layer used in Example 1 were changed to Gantz Pearl GM-0105 (Gantz Kasei Co., Ltd., average particle diameter 1 μm, refractive index 1.49). 1 scattering film was obtained.

[Reference Example 2]
A reference example was obtained in the same manner as in Example 1 except that the acrylic resin particles in the scattering layer used in Example 1 were changed to Gantz Pearl GM-1007S (Gantz Kasei Co., Ltd., average particle diameter 10 μm, refractive index 1.49). 2 scattering films were obtained.

<Experimental example 2: difference in binder resin>
[Example 3]
Example 1 except that the acrylic polyol of the resin of the scattering layer used in Example 1 was changed to ACRIDIC A817 (DIC Corporation, solid content 50%, refractive index 1.50 after curing with an isocyanate curing agent). In the same manner as described above, the scattering film of Example 3 was obtained.

<Experimental Example 3: Difference in refractive index difference>
[Example 4]
After mixing and stirring the coating solution for the scattering layer of the following formulation, it was applied on a support made of a polyethylene terephthalate film (Lumirror T60: Toray) with a thickness of 100 μm by a bar coating method so that the thickness after drying was 8 μm. The film was dried to form a scattering layer, and the scattering film of Example 4 was obtained.

<Coating liquid for scattering layer of Example 4>
-Acrylic polyol 166 parts (Acridic 52-666: DIC, solid content 50%)
・ Isocyanate-based curing agent 28.3 parts (Takenate D110N: Mitsui Chemicals, solid content 60%)
-128 parts of acrylic resin particles (Kemisnow KMR-3TA: Soken Chemical Co., Ltd., average particle diameter of 3 μm, refractive index of 1.49)
・ Dilution solvent 817 parts

  The refractive index after curing of the resin (acrylic polyol and isocyanate curing agent) used for the scattering layer was 1.53.

[Reference Example 3]
Reference was made in the same manner as in Example 4 except that the acrylic resin particles in the scattering layer used in Example 4 were changed to benzoguanamine formaldehyde resin particles (Epester MS: Nippon Shokubai Co., Ltd., average particle diameter 3 μm, refractive index 1.66). The scattering film of Example 3 was obtained.

[Reference Example 4]
Reference was made in the same manner as in Example 4 except that the acrylic resin particles in the scattering layer used in Example 1 were changed to silicone particles (Tospearl 130: Momentive Performance Materials, average particle diameter 3 μm, refractive index 1.43). The scattering film of Example 4 was obtained.

<Experimental Example 4: Difference in resin particle content>
[Example 5]
A scattering film of Example 5 was obtained in the same manner as in Example 1 except that the content of the acrylic resin particles in the scattering layer used in Example 1 was changed to 100 parts.

[Example 6]
A scattering film of Example 6 was obtained in the same manner as in Example 1 except that the content of the acrylic resin particles in the scattering layer used in Example 1 was changed to 150 parts.

[Reference Example 5]
A scattering film of Reference Example 5 was obtained in the same manner as in Example 1 except that the content of the acrylic resin particles in the scattering layer used in Example 1 was changed to 170 parts.

[Reference Example 6]
A scattering film of Reference Example 6 was obtained in the same manner as in Example 1 except that the content of the acrylic resin particles in the scattering layer used in Example 1 was changed to 78 parts.

2. Production of Organic EL Light Emitting Device The scattering films produced in Examples 1 to 6 and Reference Examples 1 to 6 were respectively pasted on the light emitting surface of an organic EL light emitting device (ORBEOS CDW-031: OSRAM), and the scattering film was attached. An organic EL light emitting device having the same was manufactured.

3. Evaluation (1) Light Utilization Efficiency The light emission efficiency (lm / W) of the organic EL light emitting device having a scattering film was measured by applying a voltage and current of 3.5 V and 120 mA to emit light. In addition, the luminous efficiency (lm / W) in the organic EL light-emitting device which does not have a scattering film used as a reference | standard was also measured separately. The measurement results are shown in Table 1. In the table, the luminous efficiency is expressed as a relative value when the numerical value of the reference organic EL light emitting device is 1.

(2) Viewing Angle Dependence For an organic EL light emitting device having a scattering film, the chromaticity (CIE color system (1931) when the viewing angle is changed from −85 degrees to +85 degrees when the front is set to 0 degrees. ) Was measured using a color luminance meter (CS-100: Konica Minolta). For chromaticity x and chromaticity y, the differences Δx and Δy between the maximum value (max) and the minimum value (min) are obtained by equations (1) and (2), and the color difference ΔE is calculated by equation (3). The index was used to evaluate the viewing angle dependency. Further, the color difference ΔE was measured and calculated in the same manner in an organic EL light emitting device that does not have a scattering film as a reference for comparison. The results are shown in Table 1. In the table, the color difference is expressed as a relative value with respect to the reference organic EL light emitting device.

[Equation 1]
Δx = xmax−xmin (1)
Δy = ymax−ymin (2)
ΔE = √ (Δx ² + Δy ² ) (3)

  Experimental Example 1 compares the performance when the average particle diameter of the resin particles contained in the scattering layer is changed. As can be seen from the results shown in the table, when the scattering films of Examples 1 and 2 having an average particle diameter of 4 μm and 6 μm, respectively, the light efficiency was high and the viewing angle dependency was improved. In Reference Example 1 using particles, the light utilization efficiency was lowered, and in Reference Example 2 using resin particles having an average particle diameter of 10 μm, good viewing angle dependency was not obtained.

  Experimental Example 2 examined the performance when different types of binder resin were used. In Example 3 using a binder resin different from the scattering film of Example 1, the average particle diameter of the resin particles and The same results as in Example 1 were obtained by adjusting the content and the difference in refractive index between the resin particles and the binder resin within an appropriate range.

  Experimental Example 3 compares the performance when the refractive index of the binder resin contained in the scattering layer is different from the refractive index of the resin particles. As can be seen from the results shown in the table, Example 4 with a refractive index difference of 0.04 has a slightly lower light utilization efficiency than the Example 1 with a refractive index difference of 0.01, and conversely the viewing angle dependency. Although there was a tendency to improve, overall performance was excellent. On the other hand, Reference Example 3 and Reference Example 4 using a combination with a large difference in refractive index were excellent in the effect of improving the viewing angle dependency, but the light utilization efficiency was greatly reduced. Although not shown in the table, the light utilization efficiency is slightly improved by reducing the resin particle content in a combination with a large refractive index difference (the content is changed to 78 parts by weight), but the light utilization is still low. Only efficiency was obtained.

  Experimental Example 4 compares the performance when the content of the resin particles contained in the scattering layer is changed. As can be seen from the results shown in the table, the viewing angle dependency tended to improve as the resin particle content increased, but for light utilization efficiency, the resin particle content was too small. Even if the amount is too much, there is a tendency to decrease, and the content with respect to 100 parts by weight of the binder resin is 100 to 160 parts by weight. As a result, the light utilization efficiency improved by 1.3 or more with respect to the reference device.

DESCRIPTION OF SYMBOLS 10 ... Scattering film 11 ... Support body 12 ... Scattering layer 20 ... Organic EL light emitting device 21 ... Anode (transparent electrode)
22 ... Cathode (back electrode)
23 ... Light emitting layer 24 ... Support 25 ... Scattering layer (scattering film)

Claims (7)

A scattering film disposed on a light emitting surface of an organic EL light-emitting device, having a scattering layer containing a binder resin and resin particles dispersed in the binder resin,
The resin particles have an average particle diameter of more than 1 μm and less than 10 μm, and when the refractive index n1 is n2 as the refractive index after curing of the binder resin,
| N1-n2 | ≦ 0.05 is satisfied,
The scattering film for organic EL, comprising 100 parts by weight or more and less than 160 parts by weight with respect to 100 parts by weight of the binder resin. The organic EL scattering film according to claim 1,
The resin particle has an average particle size of 6 μm or less, and is a scattering film for organic EL. The organic EL scattering film according to claim 1,
The scattering particle for organic EL, wherein the resin particles have an average particle diameter of 3 μm or more. The organic EL scattering film according to claim 1,
The organic EL scattering film, wherein the resin particles are contained in an amount of 120 parts by weight or more based on 100 parts by weight of the binder resin. The organic EL scattering film according to claim 1,
The organic EL scattering film, wherein a difference between a refractive index n1 of the resin particles and a refractive index n2 of the binder resin is 0.01 ≦ | n1-n2 |. A scattering film disposed on a light emitting surface of an organic EL light-emitting device, having a scattering layer containing a binder resin and resin particles dispersed in the binder resin,
The resin particles have an average particle diameter of 3 μm or more and 6 μm or less, and the refractive index n1 is 0.01 ≦ | n1−n2 | ≦ 0 when the refractive index after curing of the binder resin is n2. .05,
An organic EL scattering film, which is contained in an amount of 120 to 160 parts by weight with respect to 100 parts by weight of the binder resin.   An organic EL light-emitting device using the organic EL scattering film according to claim 1.

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