WO2013021865A1 - 有機el用散乱フィルム及びこれを用いた有機el発光装置 - Google Patents
有機el用散乱フィルム及びこれを用いた有機el発光装置 Download PDFInfo
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- WO2013021865A1 WO2013021865A1 PCT/JP2012/069481 JP2012069481W WO2013021865A1 WO 2013021865 A1 WO2013021865 A1 WO 2013021865A1 JP 2012069481 W JP2012069481 W JP 2012069481W WO 2013021865 A1 WO2013021865 A1 WO 2013021865A1
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- particles
- scattering film
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Images
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—Electrodes
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/854—Arrangements for extracting light from the devices comprising scattering means
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2101/00—Properties of the organic materials covered by group H10K85/00
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
- H10K2102/301—Details of OLEDs
- H10K2102/331—Nanoparticles used in non-emissive layers, e.g. in packaging layer
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/81—Anodes
Definitions
- the present invention relates to a scattering film used for an organic EL light emitting device.
- 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.
- the refractive index of an organic thin film layer such as an organic light emitting layer constituting the organic EL light emitting device or a support including the organic thin film layer is higher than that of air, total reflection is likely to occur at the interface of emitted light. For this reason, the light utilization efficiency is less than 20% of the total, and there is a problem that most of the light is lost.
- the organic EL light emitting device has a problem of viewing angle dependency.
- 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.
- the light emitting surface of the light emitting device is viewed from an oblique direction, light is separated for each wavelength at the interface between the light emitting layers.
- 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, when the organic EL light emitting device is viewed from the front direction, the change in the optical path length is unlikely to occur, and the light emission color of the organic EL light emitting device is unlikely to change. Changes and looks.
- the present inventors provide a scattering film including a specific scattering layer on the light emitting surface side of the organic EL light emitting device, thereby causing problems of light utilization efficiency, viewing angle dependency, and reflection during extinction. At the same time, it has been found that the problem can be solved, and the present invention has been achieved.
- the scattering film for organic EL of the present invention is used for an organic EL light-emitting device, and includes a binder resin and a scattering layer containing particles having a refractive index different from that of the binder resin, and the average particle size of the particles
- the diameter is 10 ⁇ m or less, and the variation coefficient of the average particle diameter is 30% or more.
- the organic EL scattering film of the present invention is preferably characterized in that the content ratio of the particles is 40 to 300 parts by weight with respect to 100 parts by weight of the binder resin.
- the organic EL scattering film of the present invention is preferably characterized in that the absolute value of the difference in refractive index between the refractive index of the binder resin and the refractive index of the particles is 0.03 to 0.3. It is.
- 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.
- the scattering film used in the organic EL light-emitting device comprises a scattering layer containing particles having a refractive index different from that of the binder resin and the binder resin, and the average particle size of the particles is 10 ⁇ m or less.
- scattering film for organic EL of the present invention
- the scattering film for organic EL of the present invention includes a scattering layer, but may be composed of a scattering layer alone, or may include a support or other layers.
- the elements constituting the scattering layer mainly the binder resin and particles will be described.
- a resin excellent in optical transparency can be used.
- 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
- 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.
- thermosetting resins and ionizing radiation curable resins excellent in coating film brightness and weather resistance are preferable, and acrylic resins are particularly preferably used from the viewpoint of excellent light resistance and optical properties among the above-described resins.
- the binder resin preferably has a hydroxyl group.
- the hydroxyl value of the binder resin is preferably 40 mgKOH / g or more, and more preferably 60 mgKOH / g or more.
- the refractive index of the binder resin is different from the refractive index of the particles described later. By making the refractive index of the binder resin different from that of the particles, a difference in refractive index occurs between the binder resin and the particles, so that the wavelength-separated light can be scattered in the scattering layer and mixed again. Angular dependence can be eliminated.
- the refractive index of the binder resin is preferably about 1.4 to 1.65.
- the particles contained in the scattering layer of the present invention form an uneven 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 it is possible to prevent reflection of an outside scenery or the like when the organic EL light emitting device is turned off.
- particles different from the refractive index of the binder resin are used for the particles contained in the scattering layer of the present invention.
- a difference in refractive index from the binder resin can be generated, and the wavelength-separated light can be scattered in the scattering layer and mixed again, depending on the viewing angle. Sex can be eliminated.
- resin particles or inorganic particles can be used.
- 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.
- examples of the inorganic particles include diamond, titanium oxide, zirconium oxide, lead oxide, lead carbonate, zinc oxide, zinc sulfide, antimony oxide, silica, aluminum hydroxide, barium sulfate, and calcium carbonate.
- resin particles from the viewpoint of particularly excellent light utilization efficiency.
- benzoguanamine resin particles are preferably used from the viewpoint of easily producing a difference in refractive index between the resin particles and the binder resin and improving the viewing angle dependency without impairing the light utilization efficiency.
- the particles having a refractive index of about 1.3 to 3.0 are preferably used.
- the refractive index is more preferably within the range of 1.3 to 1.7.
- the absolute value of the refractive index difference between the refractive index of the binder resin described above and the refractive index of the particles is preferably 0.03 or more, and more preferably 0.04 or more. When the absolute value of the refractive index difference is 0.03 or more, the viewing angle dependency can be further improved.
- the absolute value of the refractive index difference is preferably 0.3 or less at the upper limit, and more preferably 0.2 or less.
- the binder resin and the particles may be higher as long as there is a difference in refractive index.
- the average particle diameter of the particles is 10 ⁇ m or less.
- the surface of the scattering layer has a fineness of about a few ⁇ m in combination with a specific coefficient of variation parameter of the average particle size of the particles described later.
- the average particle diameter of the particles is more preferably in the range of 1 to 5 ⁇ m.
- the average particle diameter as used in the field of this invention means the value computed by the Coulter counter method.
- the shape of the particles is preferably an elliptical sphere or a true sphere, and most preferably close to a true sphere.
- Such particles having an irregular shape are very dispersible when used as a paint, and the particles do not enlarge due to secondary agglomeration, and a good plate or coating film can be obtained.
- the coefficient of variation of the average particle diameter of the particles is 30% or more. By making the coefficient of variation of the average particle diameter of the particles relatively high in this way, and providing particles with a relatively small average particle diameter in the scattering layer as described above, the light extraction efficiency and the viewing angle dependency can be improved. It is possible to prevent reflection when the organic EL light emitting device is turned off without hindering.
- the variation coefficient is more preferably 40% or more at the lower limit and 70% or less at the upper limit.
- the content ratio of the particles to the binder resin is also influenced by the average particle diameter and coefficient of variation of the particles used, the refractive index difference between the binder resin and the particles, the thickness of the scattering layer, etc.
- the content of particles with respect to 100 parts by weight of the binder resin is 40 parts by weight or more at the lower limit from the viewpoint of preventing reflection when the organic EL light emitting device is turned off while further improving the viewing angle dependency. Is preferable, and 60 parts by weight or more is more preferable.
- the upper limit of the content of particles with respect to 100 parts by weight of the binder resin is preferably 300 parts by weight or less, and more preferably 200 parts by weight or less.
- the content of the particles with respect to 100 parts by weight of the binder resin is preferably 40 parts by weight or more at the lower limit, and 150 parts by weight at the upper limit. The following is preferred.
- the content of the particles with respect to 100 parts by weight of the binder resin is preferably 150 parts by weight or more at the lower limit and 300 parts by weight at the upper limit. The following is preferred.
- the reflection of the organic EL light emitting device when it is turned off can be performed without impairing the light use efficiency and the viewing angle dependency. It can prevent more suitably.
- 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.
- a crosslinking agent e.g., 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 e.g., antifoaming agents, antifoaming agents, and the like.
- the thickness of the scattering layer is preferably 3 to 15 ⁇ m from the viewpoint of easily preventing the occurrence of curling when the scattering film is formed.
- the scattering film of the present invention is provided with a scattering layer, but can also be constituted by laminating the scattering layer on a support.
- a support There are no particular limitations on the support, and various supports can be used.
- 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,
- 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.
- a stretched polyethylene terephthalate film particularly a biaxially stretched film, is preferred because of its excellent mechanical strength and dimensional stability.
- the thickness of the support is usually preferably about 10 to 400 ⁇ m.
- an antireflection treatment may be applied to the surface of the scattering film surface of the present invention opposite to the uneven surface in order to improve the light transmittance.
- an antistatic layer or an adhesive layer may be provided.
- a coating solution for a scattering layer in which materials such as the binder resin and particles described above are dissolved in an appropriate solvent is used in a conventionally known method, for example, a bar coater, It can be produced by applying onto a support by a blade coater, spin coater, roll coater, gravure coater, flow coater, die coater, spray, screen printing, etc. and drying.
- the scattering film which consists of a scattering layer single layer is also producible by peeling and removing the said support body from what formed the scattering layer on the support body.
- 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. 1 shows an example of the organic EL light emitting device 10.
- the organic EL light emitting device 10 includes an anode (transparent electrode) 11 and a cathode (back electrode) 12 on a support 14 made of a transparent polymer resin, glass or the like, and a light emitting layer between the anode 11 and the cathode 12.
- the scattering layer 15 which is the scattering film of this invention is provided on the support body 14 of the anode 11 which is provided with the organic electroluminescent (organic EL) element 13 on both sides of 13 and becomes a light emission side.
- a conductive metal oxide such as SnO 2 , In 2 O 3 , or ITO can be used.
- the cathode 12 can be made of a highly reflective metal such as Al, Ag, or Mo or an alloy. Any of these electrodes 11 and 12 can be formed by a known method such as vapor deposition, sputtering, or ion plating.
- the light emitting layer 13 As a material constituting the light emitting layer 13, 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) 13 can be combined. As a method of combining the plurality of light emitting layers 13, 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.
- 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.
- the organic EL element may include a hole injection layer, a hole transport layer, an electron injection layer, an electron transport layer, a barrier layer, and the like.
- a known material is used and can be formed by a known method such as vapor deposition.
- the scattering layer 15 includes particles having different refractive indexes between the binder resin and the binder resin, and the particles have an average particle diameter of 10 ⁇ m or less and an average particle diameter variation coefficient of 30% or more.
- the scattering film of the present invention described above can be used.
- Such a scattering layer 15 is preferably provided on the light emitting side so that the surface on which the irregularities are formed by the particles becomes the light emitting surface.
- the scattering film may be directly attached to the light emitting side through a transparent adhesive layer or an adhesive layer, or the layer that becomes the outermost surface on the light emitting side, It is also possible to directly laminate and form the material constituting the scattering 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. Furthermore, it is possible to prevent the outside scenery from being reflected when the organic EL light emitting device is turned off.
- 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 ⁇ m by a bar coating method so that the thickness after drying was 8 ⁇ m. Then, a scattering layer was formed by drying, and the scattering film of Example 1 was obtained.
- a polyethylene terephthalate film Limirror T60: Toray
- Example 2 The scattering film of Example 2 in the same manner as in Example 1 except that, in the scattering layer coating solution used in Example 1, the benzoguanamine resin particles were classified by an air classifier so that the coefficient of variation was 35%. Got.
- Example 3 The scattering film of Example 3 was obtained in the same manner as in Example 1 except that the amount of benzoguanamine resin particles added to the scattering layer coating solution used in Example 1 was changed to 172 parts by weight.
- Example 4 Of the coating solution for scattering layer used in Example 1, benzoguanamine resin particles were changed to acrylic styrene resin particles (Gantz Pearl GS-0401: Gantz Kasei Co., Ltd., average particle size 4 ⁇ m, coefficient of variation 43%, refractive index 1.51). A scattering film of Example 4 was obtained in the same manner as Example 1 except for the change.
- Example 5 Of the coating solution for the scattering layer used in Example 1, benzoguanamine resin particles (53.8 parts by weight) were replaced with silicone resin particles (KMP590: Shin-Etsu Chemical Co., Ltd., average particle size 2 ⁇ m, coefficient of variation 30% or more, refractive index 1 40) (90.4 parts by weight)
- the scattering film of Example 5 was obtained in the same manner as in Example 1 except that it was changed to 90.4 parts by weight.
- Comparative Example 1 Of the coating solution for the scattering layer used in Example 1, benzoguanamine resin particles were changed to melamine resin particles (Opto beads 3500M: Nissan Chemical Industries, average particle size 3.5 ⁇ m, coefficient of variation 4%, refractive index 1.65). A scattering film of Comparative Example 1 was obtained in the same manner as Example 1 except for the change.
- Comparative Example 2 In the scattering layer coating solution used in Example 1, the scattering film of Comparative Example 2 was prepared in the same manner as in Example 1 except that the benzoguanamine resin particles were classified by an air classifier so that the variation coefficient was 28%. Got.
- Comparative Example 3 In the scattering layer coating solution used in Example 1, the benzoguanamine resin particles were changed to benzoguanamine resin particles (Epester L15: Nippon Shokubai Co., Ltd., average particle size 12.5 ⁇ m, coefficient of variation 43%, refractive index 1.66). A scattering film of Comparative Example 3 was obtained in the same manner as Example 1 except for the above.
- Comparative Example 4 In the scattering layer coating solution used in Example 1, the benzoguanamine resin particles were changed to acrylic resin particles (Gantz Pearl GM-0407S: Gantz Kasei Co., Ltd., average particle size 4 ⁇ m, coefficient of variation 43%, refractive index 1.49). A scattering film of Comparative Example 4 was obtained in the same manner as Example 1 except that.
- the scattering film of the present invention comprises a binder resin and a scattering layer containing particles having a refractive index different from that of the binder resin, and the average particle diameter of the particles is 10 ⁇ m or less. Since the variation coefficient of the average particle diameter is 30% or more, the organic EL light emitting device using the scattering film is excellent in light use efficiency, viewing angle dependency, and anti-reflection effect.
- the variation coefficient of the average particle diameter of the particles of the film is in the range of 40 to 70%, and the content ratio of the particles to the binder resin is 40 to 150 wt.
- the absolute value of the difference in refractive index between the binder resin and the particles is 0.1 or more, so that it is particularly excellent in the anti-reflection effect without impairing the light utilization efficiency and the viewing angle dependency. It became a thing.
- the organic EL light-emitting device having the scattering film was inferior in reflection prevention. became.
- the scattering film of Comparative Example 3 had an average particle diameter of more than 10 ⁇ m, the organic EL light-emitting device having the scattering film was inferior in viewing angle dependency.
- the scattering film of the comparative example 4 did not have a difference in the refractive index difference of the binder resin and particle
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Abstract
Description
[実施例1]
下記処方の散乱層用塗布液を混合し撹拌した後、厚み100μmのポリエチレンテレフタレートフィルム(ルミラーT60:東レ社)からなる支持体上に、乾燥後の厚みが8μmとなるようにバーコーティング法により塗布、乾燥して散乱層を形成し、実施例1の散乱フィルムを得た。
・アクリルポリオール 62部
(アクリディック52-666:DIC社、固形分50%)
(水酸基価75mgKOH/g、屈折率1.49)
・イソシアネート系硬化剤 38部
(タケネートD110N:三井化学社、固形分60%)
・ベンゾグアナミン樹脂粒子 53.8部
(エポスターMS:日本触媒社、屈折率1.66)
(平均粒径3μm、変動係数56%)
・希釈溶剤 115部
実施例1で用いた散乱層用塗布液のうち、ベンゾグアナミン樹脂粒子の変動係数が35%となるように空気式分級機により分級した以外は実施例1と同様にして、実施例2の散乱フィルムを得た。
実施例1で用いた散乱層用塗布液のうち、ベンゾグアナミン樹脂粒子の添加量を172重量部に変更した以外は実施例1と同様にして、実施例3の散乱フィルムを得た。
実施例1で用いた散乱層用塗布液のうち、ベンゾグアナミン樹脂粒子をアクリルスチレン樹脂粒子(ガンツパールGS-0401:ガンツ化成社、平均粒径4μm、変動係数43%、屈折率1.51)に変更した以外は実施例1と同様にして、実施例4の散乱フィルムを得た。
実施例1で用いた散乱層用塗布液のうち、ベンゾグアナミン樹脂粒子(53.8重量部)をシリコーン樹脂粒子(KMP590:信越化学工業社、平均粒径2μm、変動係数30%以上、屈折率1.40)(90.4重量部)に変更した以外は実施例1と同様にして、実施例5の散乱フィルムを得た。
実施例1で用いた散乱層用塗布液のうち、ベンゾグアナミン樹脂粒子をメラミン樹脂粒子(オプトビーズ3500M:日産化学工業社、平均粒径3.5μm、変動係数4%、屈折率1.65)に変更した以外は実施例1と同様にして、比較例1の散乱フィルムを得た。
実施例1で用いた散乱層用塗布液のうち、ベンゾグアナミン樹脂粒子の変動係数が28%となるように空気式分級機により分級した以外は実施例1と同様にして、比較例2の散乱フィルムを得た。
実施例1で用いた散乱層用塗布液のうち、ベンゾグアナミン樹脂粒子をベンゾグアナミン樹脂粒子(エポスターL15:日本触媒社、平均粒径12.5μm、変動係数43%、屈折率1.66)に変更した以外は実施例1と同様にして、比較例3の散乱フィルムを得た。
実施例1で用いた散乱層用塗布液のうち、ベンゾグアナミン樹脂粒子をアクリル樹脂粒子(ガンツパールGM-0407S:ガンツ化成社、平均粒径4μm、変動係数43%、屈折率1.49)に変更した以外は実施例1と同様にして、比較例4の散乱フィルムを得た。
実施例1~5及び比較例1~4で作製した散乱フィルムを、それぞれ有機EL発光装置(ORBEOS CDW-031:オスラム社)の光出射面上に貼り付け、散乱フィルムを有する有機EL発光装置を得た。
(1)光利用効率
実施例1~5及び比較例1~4の散乱フィルムを有する有機EL発光装置について、3.5V、120mAの電圧・電流を印加して発光させることで、発光効率(lm/W)を測定した。なお、比較の基準となる、散乱フィルムを有さない有機EL発光装置における発光効率(lm/W)も、別途測定した。測定結果を表1に示す。
散乱フィルムを有する有機EL発光装置について、正面を0度としたときに-85度から+85度まで視野角を変化させた際の色度(CIE表色系(1931))を色彩輝度計(CS-100:コニカミノルタ社)を用いて測定した。色度xと色度yについて、最大値(max)と最小値(min)との差△x、△yを式(1)、(2)により求め、さらに式(3)により色差△Eを算出し、視野角依存性を評価するための指標とした。また、比較の基準となる、散乱フィルムを有さない有機EL発光装置においても、同様に色差△Eを測定・算出した。結果を表1に示す。
実施例1~5及び比較例1~4の散乱フィルムを有する有機EL発光装置を消灯し、当該有機EL発光装置表面への外の景色の写り込み具合を目視にて観察した。その結果、外の景色をまったく視認することができなかったものを「◎」、ほとんど視認することができなかったものを「○」、外の景色を視認することができたものを「×」とした。結果を表1に示す。
11・・・陽極(透明電極)
12・・・陰極(背面電極)
13・・・発光層
14・・・支持体
15・・・本発明の散乱フィルム(散乱層)
Claims (6)
- 有機EL発光装置に用いられる散乱フィルムであって、
前記散乱フィルムは、バインダー樹脂及び前記バインダー樹脂とは屈折率の異なる粒子を含む散乱層を含んでなり、
前記粒子の平均粒子径は、10μm以下であり、
前記粒子の平均粒子径の変動係数は、30%以上であることを特徴とする有機EL用散乱フィルム。 - 請求項1記載の有機EL用散乱フィルムであって、
前記粒子の含有割合が、前記バインダー樹脂100重量部に対して40~300重量部であることを特徴とする有機EL用散乱フィルム。 - 請求項1又は2記載の有機EL用散乱フィルムであって、
前記バインダー樹脂の屈折率と前記粒子の屈折率との屈折率差の絶対値が、0.03~0.3であることを特徴とする有機EL用散乱フィルム。 - 請求項3に記載の有機EL用散乱フィルムであって、
前記バインダー樹脂の屈折率と前記粒子との屈折率差の絶対値が0.1以上であり、且つ前記バインダー樹脂100重量部に対する前記粒子の含有量が、40重量部以上、150重量部以下であることを特徴とする有機EL用散乱フィルム。 - 請求項1~4何れか一項に記載の有機EL用散乱フィルムであって、
前記バインダー樹脂がアクリル系樹脂であり、前記粒子がベンゾグアナミン樹脂、アクリルスチレン樹脂及びシリコーン樹脂のいずれかから選択される樹脂粒子であることを特徴とする有機EL用散乱フィルム。 - 一対の電極と、当該一対の電極間に設けられた発光層とを備え、前記一対の電極のうち、光出射側となる電極の光出射側に散乱フィルムを備えた有機EL発光装置であって、
前記散乱フィルムが請求項1~5何れか一項に記載の散乱フィルムであることを特徴とする有機EL発光装置。
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EP12822171.0A EP2744301B1 (en) | 2011-08-11 | 2012-07-31 | Scattering film for organic el light emitting device and organic el light emitting device using same |
JP2013527974A JP6309271B2 (ja) | 2011-08-11 | 2012-07-31 | 有機el用散乱フィルム及びこれを用いた有機el発光装置 |
CN201280033748.0A CN103650638B (zh) | 2011-08-11 | 2012-07-31 | 有机el用散射膜及使用此的有机el发光装置 |
US14/237,944 US9349980B2 (en) | 2011-08-11 | 2012-07-31 | Scattering film for organic EL and organic EL light emitting device using same |
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TWI635638B (zh) | 2018-09-11 |
US20140167029A1 (en) | 2014-06-19 |
KR101878533B1 (ko) | 2018-07-13 |
CN103650638B (zh) | 2017-11-17 |
CN103650638A (zh) | 2014-03-19 |
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