WO2014148409A1 - Dispositif émetteur de lumière électroluminescent organique - Google Patents

Dispositif émetteur de lumière électroluminescent organique Download PDF

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Publication number
WO2014148409A1
WO2014148409A1 PCT/JP2014/057052 JP2014057052W WO2014148409A1 WO 2014148409 A1 WO2014148409 A1 WO 2014148409A1 JP 2014057052 W JP2014057052 W JP 2014057052W WO 2014148409 A1 WO2014148409 A1 WO 2014148409A1
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organic
light
light emitting
panel
emitting device
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PCT/JP2014/057052
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English (en)
Japanese (ja)
Inventor
智博 内田
均 三竹
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コニカミノルタ株式会社
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Priority to JP2015506754A priority Critical patent/JP6380378B2/ja
Publication of WO2014148409A1 publication Critical patent/WO2014148409A1/fr

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/875—Arrangements for extracting light from the devices
    • H10K59/878—Arrangements for extracting light from the devices comprising reflective means

Definitions

  • the present invention relates to an organic electroluminescence light emitting device.
  • organic EL panel provided with an organic electroluminescence (hereinafter also referred to as organic EL) element as a self-luminous element has attracted attention.
  • An organic EL panel has an organic compound light-emitting layer (hereinafter also referred to as an organic light-emitting layer or simply a light-emitting layer) sandwiched between two electrodes, a first electrode (anode) and a second electrode (cathode).
  • the organic light emitting layer emits light by disposing an EL element and supplying a current between the cathode and the anode.
  • the organic EL element having such a configuration, light generated in the organic light emitting layer (hereinafter also referred to as light emission light) is extracted from the surface of the electrode (anode or cathode), so that uniform illumination is obtained on the emission surface. be able to.
  • organic EL elements can obtain emitted light that does not contain ultraviolet rays, a light source that is gentle to the eyes can be obtained. For this reason, the organic EL element is regarded as promising as a planar light emitter.
  • the organic EL element has a small number of parts, can be reduced in size and weight, and has low power consumption, so that it is expected to be used not only in small home appliances so far but also in large apparatuses.
  • large-area organic EL panels are difficult to manufacture, and uneven brightness tends to occur.
  • the large-area organic EL panel has a problem in terms of manufacturing performance. For this reason, in order to suppress luminance unevenness and manufacturing cost, a technique for producing a small organic EL panel and arranging a plurality of organic EL panels to increase the area has been studied.
  • the organic EL element of the organic EL panel is characterized by being deteriorated by water or oxygen. For this reason, it is essential to seal the organic EL element with glass or resin. In order to obtain sufficient sealing performance, it is necessary to have a sufficient sealing width to the organic EL element, and therefore there is a non-light emitting portion of about 1 mm around the light emitting portion of the organic EL panel. For this reason, when a plurality of organic EL panels are arranged, a joint portion between the plurality of organic EL panels and a non-light emitting portion are formed in the periphery thereof.
  • Patent Document 1 discloses a technique for making light propagating in the lateral direction of an organic EL panel to be taken out to the front side so that non-light emitting portions such as boundaries of the arranged organic EL panels are not conspicuous. ing.
  • Patent Document 1 makes it possible to extract light propagating in the lateral direction of the organic EL panel to the front side so that non-light emitting portions such as boundaries of the arranged organic EL panels are not conspicuous.
  • the light propagating in the lateral direction has a wavelength different from that of the light coming out from the front due to the difference in refractive index in the organic EL panel. For this reason, if the light propagating in the horizontal direction is simply taken out to the front side, it will appear as a different color from the panel light emitting surface, resulting in uneven color.
  • the non-light emitting portion around the panel light emitting surface becomes brighter than the front of the panel. Therefore, there is a problem that the boundary between the front surface of the organic EL panel and the non-light-emitting portion is conspicuous.
  • an object of the present invention is to provide an organic EL light emitting device capable of making non-light emitting portions around the organic EL panel inconspicuous while suppressing color unevenness.
  • a plurality of organic electroluminescence panels disposed on the substrate, a diffusion plate disposed opposite to the light emitting surface of the plurality of organic electroluminescence panels, and diffusing light And a reflector that reflects light from the diffusion plate.
  • an organic EL light emitting device capable of making the non-light emitting portion around the organic EL panel inconspicuous while suppressing color unevenness.
  • (A) is a top view of the organic electroluminescent light emitting device concerning a 1st embodiment of the present invention.
  • (B) is sectional drawing in the AA of (a).
  • (A) is a top view of the organic electroluminescent light-emitting device which concerns on 2nd Embodiment of this invention.
  • (B) is sectional drawing in the BB line of (a).
  • (A) is a top view of the conventional organic electroluminescent light emitting device.
  • (B) is sectional drawing in the CC line of (a).
  • the organic EL light emitting device 1 includes a substrate 11, an organic EL panel 12, a diffusion plate 13, and a reflector 14.
  • a plurality of organic EL panels 12 having a predetermined size are arranged on a substrate 11.
  • the reflector 14 is disposed on the diffusion plate 13 side (here, on the light emitting surface 12 a) of the organic EL panel 12 and in the peripheral region 23 of the organic EL panel 12.
  • the diffusion plate 13 is disposed at a position facing the light emitting surface 12 a of the organic EL panel 12.
  • the reflecting surface of the reflector 14 faces the diffusion plate 13.
  • the diffusion plate 13 is omitted for convenience of illustration.
  • the region 24 where the organic EL panel 12 does not exist on the substrate 11 and the non-light emitting portion 22 made of a sealing material or the like present at the end of the organic EL panel 12 are collectively defined as the peripheral region 23.
  • FIG. 1A shows a state in which the organic EL panels 12 are arranged in a square shape with a total of four, two vertically and two horizontally. For example, about 100 mm ⁇ 100 mm square organic EL panels 12 are arranged on the substrate 11 at an interval of 16 mm. The number of the organic EL panels and the arrangement interval can be appropriately changed according to the size of the organic EL light emitting device 1 (substrate 11).
  • the interval between the organic EL panels 12 can be narrowed to 1 mm or 9 mm, for example, and can be widened to 21 mm or 26 mm.
  • a known method such as fixing with an adhesive, fixing with a frame, fixing with screws or bolts, fixing by fitting, etc. can be applied, but other methods may be used.
  • the substrate 11 preferably has a strength capable of supporting the organic EL panel 12, the diffusing plate 13, the reflector 14 and the like constituting the organic EL light emitting device 1.
  • the substrate 11 is preferably one that can ensure the size required for the organic EL light emitting device 1. Examples of materials that can ensure the necessary strength and size include metal materials such as iron, aluminum, and stainless steel, and resin materials such as FRP and polycarbonate.
  • the substrate 11 may be more preferably one whose shape is difficult to deform after long-term use.
  • the organic EL panel 12 includes a light emitting unit 21 and a non-light emitting unit 22 made of a sealing material or the like around the light emitting unit 21.
  • the organic EL panel 12 and its light emitting part 21 are square (rectangular) in plan view, and the non-light emitting part 22 has a certain width.
  • the organic EL panel 12 includes, for example, a panel substrate 35, electrodes (cathode 32, anode 34), organic layer 33 (hole injection layer, hole transport layer, organic light emitting layer, hole blocking layer, electron transport layer, electron injection). Layer), the transparent substrate 36, the light extraction sheet 37, and the sealing material 38 are laminated.
  • a structure including the cathode 32, the organic layer 33, and the anode 34 is the organic EL element 31.
  • the sealing material 38 is formed on the side periphery of the substrate so as to seal between the panel substrate 35 and the transparent substrate 36.
  • the sealing material 38 is illustrated in an elliptical shape so that it can be easily distinguished. However, it is preferable that the sealing material 38 closely adheres between the panel substrate 35 and the transparent substrate 36.
  • the organic EL panel 12 is, for example, surface light emission, but may be an integrated point light emission. There may be an insulating layer between the panel substrate 35 and the electrode. Further, the light extraction sheet 37 may be attached to the light emitting surface 12a.
  • the light extraction sheet 37 is realized by, for example, a light diffusion sheet, a light collecting sheet, or the like. Furthermore, light scattering fine particles for improving the uniformity of luminance may be contained in any one of the layers.
  • the light diffusion sheet may be a general light diffusion sheet, and for example, a sheet member having a surface uneven shape is used.
  • the condensing sheet may be, for example, a general condensing sheet called a prism sheet, and specific examples include those that are put into practical use for LED (Light Emitting Diode) backlights of liquid crystal display devices.
  • a general condensing sheet called a prism sheet
  • specific examples include those that are put into practical use for LED (Light Emitting Diode) backlights of liquid crystal display devices.
  • the shape of the condensing sheet for example, a substrate in which stripes having a triangular cross section with an apex angle of 90 degrees are formed on a substrate with a pitch of 50 ⁇ m, or the apex angle of the cross section triangular shape is rounded, the pitch is The shape may be changed at random or other shapes.
  • the panel substrate 35 and the transparent substrate 36 of the organic EL panel 12 may be glass substrates or resin substrates.
  • the light emitting surface of the organic EL panel may be on either the cathode side or the anode side. There is no restriction
  • the reflector 14 reflects the light emitted from the light emitting surface 12 a of the organic EL panel 12 reflected by the diffuser plate 13 toward the diffuser plate 13.
  • the reflector 14 can also reflect the external light transmitted through the diffusion plate 13 toward the diffusion plate 13.
  • the organic EL light emitting device 1 shown in FIG. 1 has the reflector 14, so that even if the transmittance of the diffusion plate 13 is as high as about 40%, uneven brightness is hardly caused by the reflected light from the reflector 14.
  • the organic EL light emitting device 1 can sufficiently utilize the light emitted from the organic EL panel 12 by increasing the transmittance of the diffusion plate 13.
  • the organic EL light-emitting device 1 is an organic EL light-emitting device that is brighter and less susceptible to uneven brightness than conventional ones. In FIG. 3A, the diffusion plate 13 is omitted for the sake of illustration.
  • the reflector 14 has a plate shape and is disposed in parallel to the light emitting surface 12 a of the organic EL panel 12.
  • the shape of the reflector 14 is a plate shape, the incident angle dependency of incident light and the directivity of reflected light are reduced.
  • the organic EL light-emitting device 1 has a lower angle dependency of emitted light than an organic EL light-emitting device that extracts and uses light propagating in a lateral direction substantially parallel to the light emitting surface of the organic EL panel.
  • precise adjustment such as taking into consideration the incident angle of incident light and the reflection angle of reflected light becomes unnecessary.
  • the reflector 14 is arranged in parallel to the light emitting surface 12a of the organic EL panel 12, the light from the diffusion plate 13 is diffused facing the peripheral region 23 where the light emitting portion 21 of the organic EL panel 12 does not exist. The light can be reflected again toward the plate 13. As a result, the organic EL light-emitting device 1 is less likely to have luminance unevenness and color unevenness due to the presence of the peripheral region 23.
  • the shape of the reflector such as a mirror is triangular. Adjustment of the position and light extraction direction is required. In addition, this device has higher angle dependency of emitted light than the organic EL light emitting device 1.
  • the reflector 14 is disposed on the diffusion plate 13 side of the organic EL panel 12 and in a region excluding the light emitting unit 21. Is preferred. In other words, the reflector 14 is formed by the diffusion plate 13 side of the organic EL panel 12 and the peripheral region 23 (the region 24 where the organic EL panel 12 does not exist and the sealing material present at the end of the organic EL panel 12).
  • the non-light emitting part 22) is preferably arranged.
  • the reflector 14 it is possible to effectively use the light emitted from the organic EL panel 12 without hiding the light emitting portion 21 of the organic EL panel 12 by the reflector 14.
  • the organic EL light emitting device 1 has less luminance unevenness due to the presence of the peripheral region 23 where the light emitting unit 21 does not exist.
  • the reflector 14 since the reflector 14 is close to the diffuser plate 13, the luminance of the organic EL light emitting device 1 is improved as compared with the case where the reflector 14 is not provided.
  • the reflector 14 preferably has a higher surface reflectance. Thereby, the organic EL light-emitting device 1 has less luminance unevenness.
  • the reflector 14 is preferably one that does not change the wavelength of light during reflection. Since the reflector 14 reflects light having the same wavelength as the emitted light, the organic EL light emitting device 1 has less color unevenness.
  • the organic EL light emitting device 1 does not take out and use light having a wavelength that propagates in a lateral direction substantially parallel to the light emitting surface 12a of the organic EL panel 12. For this reason, the reflector 14 preferably does not transmit light propagating in the lateral direction of the organic EL panel 12. Since the organic EL light emitting device 1 does not extract and use light having a wavelength that propagates in the lateral direction substantially parallel to the light emitting surface 12a of the organic EL panel 12, the organic EL light emitting device 1 has little color unevenness.
  • Examples of the material of the reflector 14 include metal materials such as a mirror, foamed resin, aluminum, and silver. Among these, a foamed resin is preferable.
  • the foamed resin refers to a resin formed into a sheet shape (plate shape) that looks white by finely foaming a resin such as transparent PET resin or polycarbonate resin. Foamed resin exhibits excellent light reflection performance by repeatedly reflecting irregularly incident light at the interface between air and PET resin or polycarbonate resin.
  • a foamed resin having a high light reflectivity and a light reflectivity of 99% or more is known. Examples of the foamed resin applicable in the present embodiment include MCPET (Furukawa Electric Co., Ltd.) and MCPOLYCA (Furukawa Electric Co., Ltd.).
  • the reflector 14 is formed of a foamed resin, particularly a foamed resin having a very high light reflectance, so that the light is reflected again from the peripheral region 23 where the light emitting portion 21 of the organic EL panel 12 does not exist toward the diffusion plate 13. Therefore, the organic EL light emitting device 1 is less likely to cause color unevenness and luminance unevenness.
  • the reflector 14 is formed of a foamed resin, it is easy to manufacture the large-sized organic EL light-emitting device 1 and the large-area organic EL light-emitting device 1 that are less likely to cause color unevenness and luminance unevenness. .
  • the organic EL light emitting device 1 can be reduced in weight as a whole by forming the reflector 14 from a foamed resin. Since the foamed resin reflector is lighter than a heavy mirror, the reflector 14 is less bent by its own weight. Even if the reflector 14 is bent, since the degree of bending is small, the organic EL light-emitting device 1 is less likely to cause color unevenness and luminance unevenness, and angle dependency is also less likely to occur. Moreover, since the reflector 14 is formed of a foamed resin and is reduced in weight, the organic EL light-emitting device 1 is also difficult to bend, and uneven color, uneven brightness, and angle dependency are hardly generated. Fabrication of a large organic EL light-emitting device 1 that easily increases in weight and a large-area organic EL light-emitting device 1 is facilitated.
  • the formation of the reflector 14 from the foamed resin is advantageous also in terms of performance and function of the organic EL light emitting device 1.
  • the reflector 14 may be divided into a plurality of parts, or may be a combination of a plurality of types of materials.
  • the reflector 14 may be manufactured by attaching a sheet of foamed resin that reflects light to the surface of a support that does not transmit light.
  • the surface does not necessarily have to be a flat surface, and may be a concave surface.
  • the surface of the reflector 14 concave By making the surface of the reflector 14 concave, reflected light from the peripheral region 23 to the diffusing plate 13 facing it increases, and the organic EL light emitting device 1 has less luminance unevenness.
  • the reflector 14 By making the reflector 14 into a convex surface so that the reflector 14 is flat when installed, it can be reflected from the peripheral region 23 to the opposing diffusion plate 13, and the organic EL light emitting device 1 has a luminance. Unevenness is reduced.
  • a known method such as fixing with an adhesive, fixing with a frame, fixing with screws or bolts can be applied, but any other method may be used.
  • the diffusing plate 13 diffuses the light emitted from the light emitting surface 12a of the organic EL panel 12 and the reflected light reflected by the reflector 14 at the same time as, for example, because the surface is fine and uneven. Thus, uniform light with very little emission unevenness and color unevenness is obtained.
  • the diffusion plate 13 reflects part of the light emitted from the light emitting surface 12 a of the organic EL panel 12 toward the reflector 14.
  • the diffusion plate 13 is substantially parallel to the substrate 11 and the light emitting surface 12a of the organic EL panel 12 with a predetermined distance facing the light emitting surface 12a of the organic EL panel 12. Is arranged.
  • the distance from the light emitting surface 12a of the organic EL panel 12 to the diffusion plate 13 is preferably in the range of 5 to 70 mm.
  • the lower limit of the distance it is possible to improve the uniformity of luminance in the surface of the light emitting surface 12a of the organic EL panel 12. The shorter the distance, the higher the brightness. Further, as the distance is increased, the luminance unevenness caused by the peripheral region 23 is reduced.
  • the distance from the light emitting surface 12a of the organic EL panel 12 to the diffusion plate 13 is not limited to this range. 1 to 3, the support member for the diffusion plate 13 is omitted for convenience of illustration.
  • the diffuser plate 13 preferably has a high reflectance (low transmittance) in order to suppress the luminance unevenness of the organic EL light emitting device 1. On the other hand, in order to make the organic EL light emitting device 1 bright, it is preferable that the diffusion plate 13 has a high transmittance.
  • the diffuser plate 13 preferably has a haze value of 70 to 99% from the viewpoint of the balance between brightness uniformity and brightness height.
  • the transmittance of the diffusion plate 13 does not have to be uniform over the entire surface, and may vary depending on the portion.
  • the diffuser plate 13 may have a high transmittance at a portion facing the reflector 14 (low reflectance) and a high reflectance at a portion facing the light emitting portion 21 of the organic EL panel 12 (low transmittance). Good. By doing in this way, it becomes easier to suppress the color unevenness of the organic EL light-emitting device 1 while improving the utilization efficiency of the emitted light of the organic EL panel 12. It becomes easier to reflect part of the light emitted from the light emitting surface 12a toward the reflector 14 while transmitting the reflected light from the reflector 14.
  • the diffusing plate 13 is preferably one that does not cause a wavelength change for both reflected light and transmitted light. By doing in this way, the organic EL light-emitting device 1 becomes a thing with little color unevenness.
  • the diffusion plate 13 acrylic, PET, polycarbonate, and glass are preferable.
  • a pattern in which a pattern is printed or engraved on these surfaces or inside, or a film having a high diffusing effect is bonded or superposed is preferable.
  • a laminate in which a transmission film is bonded to an acrylic plate is preferable.
  • conventional arrangements such as reducing the arrangement interval of the organic EL panels, reducing the sealing distance of the organic EL panels, and increasing the size of the organic EL panels to reduce the number of arrangements are performed.
  • the light from the light emitting surface 12a of the organic EL panel 12 is used without any excess, and the light from the diffusion plate 13 is efficiently reflected by the reflector 14 disposed in the peripheral region 23.
  • the non-light emitting region 23 is made inconspicuous, it is possible to suppress uneven brightness and uneven color.
  • the organic EL light-emitting device 1 uses the reflector 14 to reduce luminance unevenness and color unevenness at a low cost, particularly by using the reflector 14 formed of a foamed resin having a high light reflectance. It becomes. This eliminates the need for the conventional method of reducing the transmittance of the diffuser plate 13 to prevent uneven brightness, thereby improving the light emission efficiency and reducing the distance between the organic EL panel 12 and the diffuser plate 13. Thus, the organic EL light emitting device 1 can be thinned.
  • the organic EL light emitting device 1 does not use a triangular mirror or the like having a strong directivity of reflected light for taking out and using light propagating in a horizontal direction substantially parallel to the light emitting surface of the organic EL panel, bright lines are generated. In addition, uneven brightness is less likely to occur. For this reason, even if the organic EL light-emitting device 1 is observed with the naked eye, luminance unevenness is not noticed. Furthermore, the amount of light is less than the light in the lateral direction substantially parallel to the light emitting surface 12a without taking out and using the light whose wavelength propagated in the lateral direction substantially parallel to the light emitting surface 12a of the organic EL panel 12 is not used. The brightness of the organic EL light-emitting device 1 can be sufficiently secured only by the light from the light emitting surface 12a.
  • CuPc copper phthalocyanine
  • NPD the following structural formula (2) ( ⁇ -NPD)
  • DPVBi the following structural formula (3)
  • Fir the following structural formula (4)
  • CBP the following structural formula (5)
  • Ir (ppy) 3 the following structural formula (6)
  • Ir (piq) 3 the following structural formula (7)
  • BAlq the following structural formula (8)
  • Alq 3 the following structural formula (9)
  • LiF lithium fluoride
  • the deposition crucible containing CuPc was energized and heated, and CuPc was deposited on the ITO electrode side of the transparent substrate at a deposition rate of 0.1 nm / second, A 15 nm hole injection layer was provided.
  • NPD was deposited on the hole injection layer at a deposition rate of 0.1 nm / second at a deposition rate of 0.1 nm / second to provide a 25 nm hole transport layer.
  • a blue light emitting layer having a film thickness of 15 nm was provided by co-evaporating on the hole transport layer at a total deposition rate of 0.1 nm / sec using Fir (pic) as 3 mass% and DPVBi as a host.
  • Ir (ppy) 3 was set to 5 mass%, CBP was used as a host, and co-evaporated on the intermediate layer at a total deposition rate of 0.1 nm / second to provide a green light emitting layer having a thickness of 10 nm.
  • CBP was deposited as an intermediate layer by 5 nm on green light emission at a deposition rate of 0.1 nm / second.
  • Ir (piq) 3 was 8 mass%
  • CBP was used as a host
  • the red light emitting layer having a thickness of 10 nm was provided by co-evaporation on the intermediate layer at a total deposition rate of 0.1 nm / second.
  • BAlq was deposited as a hole blocking layer on the red light emitting layer at a deposition rate of 0.1 nm / second for 15 nm.
  • Alq was deposited as an electron transport layer on the hole blocking layer at a deposition rate of 0.1 nm / second for 30 nm.
  • LiF was deposited as an electron injection layer on the electron transport layer by 1 nm at a deposition rate of 0.1 nm / second.
  • silver (Ag) 110 nm was vapor-deposited to form a cathode, and an organic EL element 31 was produced.
  • the organic EL panel 12 was produced in a glove box under a nitrogen atmosphere (in an atmosphere of high-purity nitrogen gas having a purity of 99.999% or more) without being brought into contact with the air.
  • the light extraction film was bonded to the light emitting surface (light extraction surface) of the transparent substrate 36 of the organic EL panel 12.
  • the organic EL panel 12 can be manufactured.
  • the organic EL light-emitting device 1 can be produced by arrange
  • the organic EL light emitting device 2 has a reflector 14 disposed on the substrate 11 and around the organic EL panel 12. That is, in the organic EL light emitting device 2, the reflector 14 is arranged in the region 24 where the organic EL panel 12 does not exist in the peripheral region 23. In FIG. 2A, the diffusion plate 13 is omitted for convenience of illustration.
  • the arrangement work of the reflectors 14 on the substrate 11 can be facilitated, for example, only by stretching the substrate 11.
  • the reflector 14 does not take out and use light having a changed wavelength that propagates in a lateral direction substantially parallel to the light emitting surface 12 a of the organic EL panel 12. Further, the reflector 14 is unlikely to cause a wavelength change upon reflection. For this reason, even if the reflected light reflected by the reflector 14 is used, the organic EL light-emitting device 2 has little color unevenness.
  • the organic EL light emitting device may be configured using a regular hexagonal organic EL panel.
  • the shape of the organic EL panel may be anything as long as it can be arranged on a plane such as a regular triangle or a parallelogram. A plurality of types of shapes may be used as the organic EL panel.
  • the organic EL panel can also be arranged arbitrarily such as a square, a rectangle, a circle, and a triangle. The arrangement of the organic EL panel can be shifted by a half pitch, in the form of a honeycomb, or in the shape of an arrow in consideration of use as a sign plate.
  • the interval between the organic EL panels can be further increased to 40% or 50%, exceeding 25% of the size of the organic EL panel.
  • the size of the organic EL panel may be about 50 mm square, for example. This makes it possible to reduce the light emitting area and suppress the in-plane luminance gradient. Since it can be manufactured by a conventional manufacturing technique of a small organic EL panel, the manufacturing is easy and the manufacturing cost can be reduced.
  • the size of the organic EL panel may be about 150 mm square, for example. Thereby, it is possible to reduce the manufacturing time of an organic EL light-emitting device, particularly a large organic EL light-emitting device, by reducing the number of parts by reducing the number of organic EL panels to be used. The present invention can be applied even to an organic EL panel larger than 150 mm square.
  • the shape of the organic EL light emitting device is not limited to a flat plate shape, and may be a curved surface formed by combining planes. Furthermore, the organic EL light emitting device can be used not only as a lighting fixture but also as a signal display device and a sign display device. In addition, the specific configuration and application of each unit and each means can be appropriately changed without departing from the gist of the present invention.
  • the organic EL light emitting device according to the present invention was produced as follows. As a substrate, about 100 mm x 100 mm organic EL panels on a metal plate with a size of about 1.2 m x 0.6 m, 12 in length, 6 in width, 72 in total, with a space of 1 mm between the organic EL panels in a rectangular shape Arranged. Next, as a reflector, MCPET (manufactured by Furukawa Electric Co., Ltd.) provided with openings corresponding to the number of light emitting portions of the organic EL panel on the light emitting surface of the organic EL panel and excluding the light emitting portion (peripheral region) is used. Arranged.
  • MCPET manufactured by Furukawa Electric Co., Ltd.
  • the reflector was a single plate having a size of about 1.2 m ⁇ 0.6 m. Then, a diffusion plate having a size of about 1.2 m ⁇ 0.6 m (Kuraray Co., Ltd., Paraglass 431L milk half) was disposed so as to face the light emitting surfaces of the plurality of organic electroluminescence panels.
  • the organic EL light emitting device (Example) has the same shape and structure as the organic EL light emitting device except the reflector, that is, the organic EL panel is disposed on the substrate and faces the light emitting surface of the organic EL panel.
  • An organic EL light emitting device having a diffusion plate disposed at a position was produced as a comparative example.
  • the luminance drop (ratio of the minimum luminance to the maximum luminance) of the organic EL light emitting device of the example is 30% to 50% compared to the luminance drop of the organic EL light emitting device of the comparative example without the reflector. Improved.

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Abstract

Le problème posé par la présente invention est de fournir un dispositif émettant de la lumière EL organique qui puisse faire passer inaperçues des sections n'émettant de la lumière entourant des panneaux EL organiques tout en réduisant l'irrégularité de couleur. La solution de la présente invention porte sur un dispositif émetteur de lumière EL organique (1) comportant les éléments suivants : une pluralité de panneaux électroluminescents organiques (12) agencée par-dessus un substrat (11) ; un panneau diffuseur (13) qui est positionné de façon à faire face à des surfaces émettant de la lumière (12a) des panneaux électroluminescents organiques (12) et qui diffuse de la lumière ; et un réflecteur (14) qui est prévu dans une région (23) entourant les panneaux électroluminescents organiques et qui réfléchit de la lumière depuis le panneau diffuseur (13).
PCT/JP2014/057052 2013-03-21 2014-03-17 Dispositif émetteur de lumière électroluminescent organique WO2014148409A1 (fr)

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WO2007043527A1 (fr) * 2005-10-11 2007-04-19 Kuraray Luminas Co., Ltd. Dispositif lumineux
JP2009152148A (ja) * 2007-12-21 2009-07-09 Rohm Co Ltd 有機発光装置
WO2010032596A1 (fr) * 2008-09-22 2010-03-25 コニカミノルタホールディングス株式会社 Panneau à émission de lumière par la surface
WO2010146894A1 (fr) * 2009-06-15 2010-12-23 シャープ株式会社 Module électroluminescent, dispositif d'éclairage, dispositif d'affichage et récepteur de télévision
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