JP2016181361A - Organic electroluminescent panel and lighting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dual-side emission type organic electroluminescent panel capable of performing light emission on only one-face side and seeing through one-face side from the other-face side during lighting of one-face side.SOLUTION: The organic electroluminescent panel includes: a glass substrate having light permeability; a first electroluminescent element layered on the glass substrate and emitting light to one side in a layering direction; a second organic electroluminescent element arranged spaced from the first electroluminescent element in an in-plane direction of the glass substrate, layered on the glass substrate and emitting light to the other side in a layering direction.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to an organic electroluminescence panel.

  2. Description of the Related Art There are known single-sided and double-sided organic electroluminescence panels that emit light from a light-emitting surface using an organic light-emitting diode (OLED). As this type of organic electroluminescence panel, there is a transmissive organic electroluminescence panel that can be seen through one side of the front and back surfaces through the other side when the light is extinguished.

  A transmissive and double-sided emission type organic electroluminescence panel has a configuration in which a laminated structure in which an organic electroluminescence layer is sandwiched between a pair of transparent electrode layers having light transmittance is provided on a glass substrate. In this organic electroluminescence panel, transparency (transparency) is obtained that can be seen through one side of the front surface and the back surface through the transparent electrode layer when the light is extinguished.

  In addition, as a transmission type single-sided emission type organic electroluminescence panel, a laminated structure in which an organic electroluminescence layer is sandwiched between a transparent electrode layer having light transmittance and a reflective electrode layer having light reflectivity, A structure provided on a glass substrate is known. In this organic electroluminescence panel, the reflective electrode layer is formed in a fine stripe shape, thereby having a plurality of reflective electrode portions arranged at intervals in the in-plane direction parallel to the front surface and the back surface. . Thereby, since the space | interval of each stripe-shaped reflective electrode part functions as a light transmissive part between the surface of an organic electroluminescent panel, and a back surface, transparency is acquired.

  In addition, as another double-sided light emitting organic electroluminescence panel, two organic electroluminescence layers are laminated with a reflective electrode layer interposed therebetween, and a configuration in which a reflective electrode layer and a transparent electrode layer are sandwiched. There is known a configuration in which two organic electroluminescence layers are stacked with a transparent electrode layer interposed therebetween and sandwiched between a pair of transparent electrode layers.

International Publication No. 2010/046833 JP 2001-176664 A Japanese Patent No. 3560375

  By the way, in the above-described transmissive and double-sided light emitting organic electroluminescence panel, both surfaces emit light when turned on, and only one surface side cannot emit light. For this reason, in this transmissive organic electroluminescence panel, it is impossible to see through the other surface side from one surface side during lighting.

  Further, in the above-described transmission type single-sided emission type organic electroluminescence panel, it is possible to see through the other side from one side when lighting, but only one side can emit light. Can not. For this reason, this transmissive organic electroluminescence panel is poorly used as illumination light.

  Furthermore, also in the other double-sided light emitting organic electroluminescence panels described above, in the configuration in which two organic electroluminescence layers are stacked with the transparent electrode layer sandwiched therebetween, when one is turned on, the other side is watermarked. There is a problem that cannot be seen. Moreover, in the structure which laminated | stacked two organic electroluminescent layers on both sides of the reflective electrode layer, there exists a problem in which transparency is not acquired.

  Therefore, the present invention enables light emission from only one surface side in a double-sided light emitting organic electroluminescence panel, and allows one surface side to be seen through from the other surface side when the one surface side is turned on. An object of the present invention is to provide an organic electroluminescence panel and a lighting device that can be used.

  An organic electroluminescence panel according to an embodiment includes a substrate having optical transparency, a first organic electroluminescence element that is stacked on the substrate and emits light to one side in the stacking direction, and an in-plane of the substrate A second organic electroluminescence element disposed on the substrate and spaced from the first organic electroluminescence element in a direction and emitting light to the other side in the laminating direction. To do.

  According to the present invention, in a double-sided light emitting organic electroluminescence panel, it is possible to emit light only on one surface side, and when one surface side is turned on, one surface side is seen through from the other surface side. Can do.

FIG. 1 is a cross-sectional view schematically showing the organic electroluminescence panel according to the first embodiment. FIG. 2 is a cross-sectional view schematically showing the first and second organic electroluminescence elements of the organic electroluminescence panel according to Modification 1 of the first embodiment. FIG. 3 is a cross-sectional view schematically showing first and second organic electroluminescence elements of an organic electroluminescence panel according to Modification 2 of the first embodiment. FIG. 4 is a cross-sectional view schematically showing an organic electroluminescence panel according to the second embodiment.

  An organic electroluminescence (hereinafter, referred to as organic EL) panel 1 according to an embodiment described below includes a glass substrate 11, a first organic EL element 12, and a second organic EL element 13. The glass substrate 11 has light transmittance. The first organic EL element 12 is stacked on the glass substrate 11 and emits light to one side in the stacking direction. The second organic EL element 13 is disposed on the glass substrate 11 while being spaced from the first organic EL element 12 in the in-plane direction of the glass substrate 11. The second organic EL element 13 emits light to the other side in the stacking direction.

  Moreover, in the organic EL panel 1 according to the embodiment described below, the first organic EL element 12 includes the first electrode layer 16, the organic EL layer 17 (first organic EL layer), and the second And an electrode layer 18. The first electrode layer 16 has optical transparency and is laminated on the glass substrate 11. The organic EL layer 17 (first organic EL layer) is stacked on the first electrode layer 16. The second electrode layer 18 has light reflectivity and is stacked on the organic EL layer 17 (first organic EL layer). The second organic EL element 13 includes a reflective layer 20, a first electrode layer 16 (third electrode layer), an organic EL layer 17 (second organic EL layer), and a second electrode layer 19 ( A fourth electrode layer). The reflective layer 20 is laminated on the glass substrate 11. The first electrode layer 16 (third electrode layer) of the second organic EL element 13 has optical transparency and is laminated on the reflective layer 20. The organic EL layer 17 (second organic EL layer) of the second organic EL element 13 is laminated on the first electrode layer 16 (third electrode layer). The second electrode layer 19 (fourth electrode layer) of the second organic EL element 13 has optical transparency and is laminated on the organic EL layer 17 (second organic EL layer).

  In the organic EL panel 2 according to the embodiment described below, the first organic EL element 12 includes a first electrode layer 16, an organic EL layer 17, and a second electrode layer 18. The first electrode layer 16 has optical transparency and is laminated on the glass substrate 11. The organic EL layer 17 is stacked on the first electrode layer 16. The second electrode layer 18 has light reflectivity and is laminated on the organic EL layer 17. The second organic EL element 23 includes the second electrode layer 18, the organic EL layer 17, and the first layer stacked on the glass substrate 11 so as to be opposite to the first organic EL element 12 with respect to the stacking direction. 1 electrode layer 16 is provided.

  In addition, the organic EL panel 1 according to the embodiment described below has a total area of a region where the first and second organic EL elements 12 and 13 are arranged at intervals in the in-plane direction of the glass substrate 11. On the other hand, the ratio of the total area of the light emitting regions of the first and second organic EL elements 12 and 13 is 10% or more and 90% or less.

  Moreover, the organic EL panel 1 according to the embodiment described below includes the first and second organic EL elements 12, 13 with respect to the direction in which the first and second organic EL elements 12, 13 are spaced apart from each other. 13 widths W1 and W2 are 10 μm or more and 10 mm or less.

  In addition, the illumination device according to the embodiment described below includes an organic EL panel 1.

  The organic EL panel 1 according to the embodiment described below further includes a control circuit 10. The control circuit 10 performs control so that only one of the first and second organic EL elements 12 and 13 emits light.

(First embodiment)
Hereinafter, an organic EL panel according to an embodiment will be described with reference to the drawings. FIG. 1 is a cross-sectional view schematically showing the organic EL panel according to the first embodiment.

  An organic EL panel according to an embodiment of the present invention is a light-transmitting double-sided light emitting type that can be seen through one surface side of a front surface that is a light emitting surface and a back surface that is a non-light emitting surface through the other surface side. It is an organic EL panel. The organic EL panel of the embodiment is suitable for use in, for example, a lighting device that combines direct lighting and indirect lighting in a hospital room, a lighting device for exhibits in a display device, and the like.

(Organic EL panel configuration)
As shown in FIG. 1, an organic EL panel 1 according to the first embodiment includes a glass substrate 11 as a light-transmitting substrate, a first organic EL element 12 and a second organic EL element 12 formed on the glass substrate 11. The organic EL element 13 and the sealing glass 14 are provided. The glass substrate 11 and the sealing glass 14 are made of soda lime glass having non-moisture permeability and light permeability. The sealing glass 14 is formed in a flat dish shape, and the outer peripheral edge is bonded to the outer peripheral edge of the glass substrate 11 by the adhesive 15, so that the inside is hermetically sealed. Moreover, each wiring (not shown) electrically connected with each electrode layer 16 and 18 (described later) constituting the organic EL element 12 is drawn out of the sealing glass 14.

  As shown in FIG. 1, the organic EL panel 1 includes a control circuit 10 as a control unit capable of independently controlling light emission of the first organic EL element 12 and the second organic EL element 13. Have The control circuit 10 causes only one of the first organic EL element 12 and the second organic EL element 13 to emit light, and simultaneously emits both the first organic EL element 12 and the second organic EL element 13. It is possible to make it.

(Configuration of organic EL element)
For convenience of explanation, in the first organic EL element 12 and the second organic EL element 13, the same constituent layers are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 1, the first organic EL element 12 includes a first electrode layer 16, an organic EL layer 17 as a first organic EL layer, and a second electrode layer 18. The first organic EL element 12 emits light to the surface A side as one side in the stacking direction.

  The first organic EL element 12 includes a plurality of first stacked bodies 12 a arranged on the glass substrate 11 with a predetermined interval with respect to the in-plane direction of the glass substrate 11. The first laminated body 12 a is formed in a straight line along the in-plane direction of the glass substrate 11. Therefore, the first organic EL element 12 is formed in a stripe shape by arranging a plurality of linear first stacked bodies 12a at intervals.

  The second organic EL element 13 includes a reflective layer 20, a first electrode layer 16 as a third electrode layer, an organic EL layer 17 as a second organic EL layer, and a fourth electrode layer. A second electrode layer 19. The second organic EL element 13 is arranged at a predetermined interval with respect to the first organic EL element 12 in the in-plane direction of the glass substrate 11, and emits light to the back surface B side as the other side in the stacking direction. Is emitted.

  Similarly to the first organic EL element 12, the second organic EL element 13 includes a plurality of elements arranged on the glass substrate 11 with a predetermined interval with respect to the in-plane direction of the glass substrate 11. The second stacked body 13a is included. The second laminated body 13a is formed in a straight line along the in-plane direction of the glass substrate 11 like the first laminated body 12a. Therefore, the second organic EL element 13 is formed in a stripe shape by arranging a plurality of linear second stacked bodies 13a at intervals. And the 1st laminated body 12a and the 2nd laminated body 13a are alternately arrange | positioned with respect to the in-plane direction of the glass substrate 11, and are mutually arrange | positioned at predetermined intervals.

  The first electrode layer 16 of the first organic EL element 12 has optical transparency and is laminated on the glass substrate 11. The first electrode layer 16 is a so-called transparent electrode layer, and is formed of, for example, ITO (indium tin oxide) or the like. Although not shown, an electrode terminal is provided at the end of the first electrode layer 16, and the electrode terminal is covered with an insulating material, and the electrode terminal is electrically connected to the outside of the organic EL panel 1. Connected.

The organic EL layer 17 of the first organic EL element 12 is stacked on the first electrode layer 16. Although not shown, the organic EL layer 17 has a hole transport layer stacked on the first electrode layer 16 side, a light emitting layer stacked on the hole transport layer, an electron transport layer stacked on the light emitting layer, Have The light emitting layer is an organic layer, and is formed of, for example, α-NPD (bis [N- (1-naphthyl) -N-phenyl] benzidine) and Alq ₃ (tris (8-hydroxyquinolinolato) aluminum). ing. Although not shown, the organic EL layer 17 includes a hole injection layer stacked between the first electrode layer 16 and the hole transport layer, and an electron injection layer stacked on the electron transport layer. .

  The second electrode layer 18 of the first organic EL element 12 is formed of a material having light reflectivity, for example, aluminum, silver, or a material containing at least one of these, and is formed on the organic EL layer 17. Are stacked.

  The reflective layer 20 of the second organic EL element 13 is formed of a light reflective material, for example, aluminum, silver, or a material containing at least one of these, and is laminated on the glass substrate 11. . In addition, the first electrode layer 16 (third electrode layer) and the organic EL layer 17 (second organic EL layer) of the second organic EL element 13 are the first electrode of the first organic EL element 12. It is the same as the layer 16 and the organic EL layer 17 (first organic EL layer).

  The second electrode layer 19 of the second organic EL element 13 has optical transparency and is stacked on the organic EL layer 17. The second electrode layer 19 is a transparent electrode layer similarly to the first electrode layer 16 of the first organic EL element 12, and is formed of an extremely thin film such as Ag, Mg / Ag, or Al.

  Moreover, in the organic EL panel 1, the gap between the first organic EL element 12 and the second organic EL element 13, that is, the gap between the first stacked body 12a and the second stacked body 13a, A plurality of light transmission portions 21 are configured. As described above, the organic EL panel 1 has a plurality of light transmission portions 21, thereby ensuring transparency.

  Moreover, the organic EL panel 1 has the first and second areas with respect to the entire area of the region where the first and second organic EL elements 12 and 13 are spaced apart in the in-plane direction of the glass substrate 11. The ratio of the total area of the light emitting regions of the organic EL elements 12 and 13 is set to 10% or more and 90% or less. Preferably, the ratio of the total area of the light emitting regions of the first and second organic EL elements 12 and 13 is 15% or more and 45% or less. Therefore, when the above-mentioned ratio is 10%, a plurality of light transmission parts are formed with respect to the entire area of the region of the glass substrate 11 in which the first and second organic EL elements 12 and 13 are arranged at intervals. The ratio of the total area occupied by 21 regions is 90%. Moreover, when the ratio is 90%, the ratio of the total area occupied by the regions of the plurality of light transmission portions 21 is 10% with respect to the total area of the region of the glass substrate 11 described above.

  When the above ratio exceeds 90%, the entire area of the plurality of light transmission portions 21 is reduced, and it is not preferable to use as a transmissive organic EL panel because the transparency cannot be appropriately secured. . On the other hand, when the ratio is less than 10%, the widths of the first and second stacked bodies 12a and 13a with respect to the in-plane direction of the glass substrate 11 are reduced, and the first and second stacked bodies 12a and 13a are Since it becomes difficult to form a stripe pattern properly, it is not preferable in the manufacturing process. Moreover, since the area | region of the whole organic EL layer decreases, light quantity is scarce and it cannot ensure appropriately, it is not preferable when using it as an organic EL panel.

  Further, when the width W1 of each reflective electrode portion 18a of the electrode layer 18 and the width W2 of each reflective layer portion 20a of the reflective layer 20 are 10 μm or less, the pattern of the reflective electrode portion 18a and the reflective layer portion 20a is appropriately set. Since it becomes difficult to form, it is not preferable in the manufacturing process. Specifically, the striped second electrode layer 18 and the reflective layer 20 are formed using a metal mask in a vapor deposition method. Therefore, when the width W1 of each reflective electrode portion 18a of the electrode layer 18 and the width W2 of each reflective layer portion 20a of the reflective layer 20 are 10 μm or less, the strength can be appropriately maintained without twisting the metal mask. It becomes difficult to form the second electrode layer 18 and the reflective layer 20 in a stripe shape. When the width W1 of each reflective electrode portion 18a of the second electrode layer 18 and the width W2 of each reflective layer portion 20a of the reflective layer 20 are 10 mm or more, it depends on the individual second electrode layer 18 and the reflective layer 20 Since the light shielding property becomes high and the transparency cannot be ensured properly, it is not preferable for use as a transmissive organic EL panel.

  In the first embodiment, the first and second organic EL elements 12 and 13 include the plurality of first and second stacked bodies 12a and 13a. However, the present invention is not limited to this configuration. Instead, the organic EL elements 12 and 13 may be configured as a single laminate.

  Although not shown, in the first embodiment, instead of the second electrode layer 18 of the first organic EL element 12, an electrode layer having light transmittance and a reflection layered on the electrode layer are stacked. A configuration having layers may be used.

(Manufacturing process of organic EL panel)
A manufacturing process of the organic EL panel 1 configured as described above will be described. A glass substrate 11 having a square shape of about 100 mm × 100 mm and a thickness of about 0.7 mm is used. First, with respect to the first organic EL element 12, a first electrode layer 16 having optical transparency is formed on the surface of the glass substrate 11 to a thickness of about 150 nm by, for example, sputtering using ITO. Subsequently, the first electrode layer 16 formed on the glass substrate 11 is patterned into a desired shape by photolithography.

  The first electrode layer 16 of the first organic EL element 12 determines the transmittance of the organic EL panel 1, and in this embodiment, the transmittance is set to 85% as an example. That is, the total area occupied by the plurality of light transmission portions 21 is set to 85% with respect to the total area of the organic EL element 12 in the direction orthogonal to the stacking direction.

  Therefore, in the in-plane direction of the glass substrate 11, the first organic EL with respect to the entire area of the region on the glass substrate 11 where the first and second organic EL elements 12 and 13 are arranged with a space therebetween. The light emitting region of the element 12 (area occupied by the plurality of first laminated bodies 12a group) is set to 7.5%. That is, the area occupied by the first electrode layer 16 is set to 7.5% with respect to the total area of the above-described region. The sum of the area occupied by the first stacked body 12a group and the area occupied by the second stacked body 13a group is set to 15%. The first electrode layer 16 is formed in a pattern including a plurality of transparent electrode portions periodically arranged at equal intervals so as to satisfy this ratio.

  Next, for the second organic EL element 13, the reflective layer 20 is formed on the surface of the glass substrate 11 to a thickness of about 150 nm by, for example, a sputtering method using Al. Subsequently, the reflective layer 20 formed on the glass substrate 11 is patterned into a desired shape by photolithography.

  At this time, the reflective layer 20 of the second organic EL element 13 also determines the transmittance of the organic EL panel 1 and is patterned so that the transmittance is 85%. Therefore, in the in-plane direction of the glass substrate 11, the second organic EL with respect to the entire area of the region on the glass substrate 11 where the first and second organic EL elements 12 and 13 are arranged with a space therebetween. The light emitting region of the element 13 (area occupied by the plurality of second stacked bodies 13a group) is set to 7.5%. That is, the area occupied by the reflective layer 20 is set to 7.5% with respect to the total area of the above-described region. The reflective layer 20 is formed in a pattern including a plurality of reflective portions arranged periodically at regular intervals so as to satisfy this ratio.

  Subsequently, with respect to the second organic EL element 13, a first electrode layer 16 having optical transparency is formed on the reflective layer 20 to a thickness of about 150 nm by, for example, sputtering using ITO. The first electrode layer 16 of the first organic EL element 12 and the first electrode layer 16 of the second organic EL element 13 may be collectively formed in the same process.

  Next, in order to prevent a short circuit between the first electrode layer 16 and the reflective layer 20, and the second electrode layer 18 and the second electrode layer 19, an insulating layer (not shown) is formed by spin using poly + imide. A film is formed to a thickness of about 1.5 μm by a coating method. Subsequently, the insulating layer is patterned into a desired shape so as to cover the outer edge portion of the first electrode layer 16 by photolithography as described above.

Next, the organic EL layer 17, which is an organic laminate that emits white light, is formed on the first electrode layer 16 of the first organic EL element 12 and on the first electrode layer 16 of the second organic EL element 13. A film is formed thereon by vacuum evaporation. At this time, as the organic EL layer 17, a hole transport layer is first formed to a thickness of about 60 nm by α-NPD. Subsequently, a blue light emitting layer is formed to a thickness of about 20 nm so that the host is α-NPD and the dopant is perylene, and the dopant concentration is 1 wt%. Subsequently, a red light emitting layer is formed to a thickness of 40 nm so that the host is Alq ₃ and the dopant is DCM1 so that the dopant concentration is 1 wt%. Finally, an electron transport layer is formed to a thickness of about 20 nm with Alq ₃ .

  As described above, in the first embodiment, the first electrode layer 16 of the first organic EL element 12 and the first electrode layer 16 of the second organic EL element 13 are shared, The organic EL layer 17 of the first organic EL element 12 and the organic EL layer 17 of the second organic EL element 13 are shared.

  Next, the second electrode layer 18 having light reflectivity is formed on the organic EL layer 17 of the first organic EL element 12 by, for example, a vacuum evaporation method using LiF and Al. At this time, the second electrode layer 18 is formed of a LiF film having a thickness of about 0.7 nm and an Al film having a thickness of about 150 nm. Subsequently, a light-transmissive second electrode layer 19 is formed on the organic EL layer 17 of the second organic EL element 13 by, for example, a vacuum evaporation method using LiF and Al. At this time, the second electrode layer 18 is formed of a LiF film having a thickness of about 0.7 nm and an Al film having a thickness of about 10 nm. Thereby, the transmissive and double-sided light emitting organic EL panel 1 is formed.

  Finally, since the first and second organic EL elements 12 and 13 manufactured as described above are very fragile to moisture of the outside air, the first and second organic EL elements 12 and 13 are formed using a moisture-impermeable protective member. The organic EL elements 12 and 13 of 2 are covered and hermetically sealed. Moreover, since the organic EL panel 1 of this embodiment needs to ensure transparency, the 1st and 2nd organic EL elements 12 and 13 are covered using a transparent protective member. For this reason, soda lime glass is used as the sealing glass 14 which is a protective member.

  Then, the outer peripheral edge of the glass substrate 11 and the outer peripheral edge of the sealing glass 14 are bonded together using a UV (ultraviolet) curable adhesive as the adhesive 15 in a dry nitrogen atmosphere. After bonding, in a state where the first and second organic EL elements 12 and 13 are shielded from being irradiated with UV, the adhesive application portion is irradiated with UV to cure the adhesive, thereby forming an organic EL panel. 1 is hermetically sealed. As the sealing structure, for example, a dam / fill sealing structure in which the inside of the sealing glass 14 is filled with a resin material or a hollow sealing structure in which the inside of the sealing glass 14 is hollowed are applied.

(Light behavior in organic EL panels)
Next, in the organic EL panel 1 of the first embodiment, the behavior of light emitted to the front surface A side and the back surface B side will be described. First, in the first and second organic EL elements 12 and 13 of the organic EL panel 1, in the organic EL layer 17, the holes supplied from the hole transport layer through the hole injection layer and the electron injection layer are used. As the electrons supplied from the electron transport layer are combined with each other in the light emitting layer, the light emitting layer emits light.

  At this time, in each first stacked body 12a of the first organic EL element 12, the light emitting layer disposed between the first electrode layer 16 and the second electrode layer 18 emits light. Of the light emitted from the light emitting layer, the light traveling toward the first electrode layer 16 side passes through the glass substrate 11 and is emitted from the surface A side. Of the light emitted from the light emitting layer, the light traveling toward the second electrode layer 18 is reflected by the second electrode layer 18, passes through the first electrode layer 16, and passes from the surface A side. Emitted.

  Similarly, in each 2nd laminated body 13a of the 2nd organic EL element 13, the light emitting layer arrange | positioned between the 1st electrode layer 16 and the 2nd electrode layer 19 emits light. Of the light emitted from the light emitting layer, the light traveling toward the second electrode layer 19 side passes through the sealing glass 14 and is emitted from the back surface B side. Of the light emitted from the light emitting layer, the light traveling toward the first electrode layer 16 is reflected by the reflective layer 20, passes through the second electrode layer 19, and is emitted from the back surface B side. .

  Therefore, in the organic EL panel 1, the light emitted from the first stacked body 12a group of the first organic EL elements 12 is emitted from the surface A side, and the second stacked body 13a of the second organic EL elements 13 is emitted. The light emitted from the group is emitted from the back surface B side. For this reason, both the front surface A and the back surface B emit light when the first and second organic EL elements 12, 13 emit light.

  In addition, the organic EL panel 1 controls the first and second organic EL elements 12 and 13 by the control circuit 10 so that the first stacked body group 12a of the first organic EL element 12 and the second Only one of the second stacked body group 13a of the organic EL element 13 is selectively lit.

  In addition, at the time of lighting in which only one of the first and second organic EL elements 12 and 13 emits light, the first and first organic EL elements 12 and 13 pass through the light transmitting portion 21 from one surface side of the front surface A side and the back surface B side. It is possible to visually recognize the object illuminated by the light emitted from one of the two organic EL elements 12 and 13. Further, when the light is turned off, it is possible to visually recognize the other surface side from one surface side of the front surface A side and the back surface B side through the light transmission portion 21.

(Effects of the first embodiment)
1st Embodiment is arrange | positioned at intervals with respect to the 1st organic EL element 12 in the in-plane direction of the glass substrate 11, and the 1st organic EL element 12 which radiate | emits light toward the surface A side. And a second organic EL element 13 that emits light toward the back surface B side. Thereby, in the double-sided light emitting organic EL panel 1, the transparency (transparency) seen through the other surface side from the one surface side is ensured, and the first organic EL element 12 and the second organic EL are confirmed. By causing only one of the elements 13 to emit light, it is possible to emit light only on one surface side of the front surface A side and the back surface B side. As a result, in the double-sided light emitting organic EL panel 1, one surface side can be seen through from the other surface side during lighting when one surface side of the front surface A side and the back surface B side emits light.

  Therefore, according to the first embodiment, for example, it is possible to selectively illuminate one or both of the front surface A side and the rear surface B side, and has transparency even when lighting one surface side. This makes it possible to broaden the usage of lighting. That is, it is possible to realize various illumination lights including dimming and toning by combining the transparency during lighting and the illumination light on the front surface A side and the illumination light on the back surface B side.

  In the first embodiment, the first and second stacked bodies 12a and 13a of the first and second organic EL elements 12 and 13 are alternately arranged in the in-plane direction of the glass substrate 11. Similar surface emission can be obtained on the front surface A side and the back surface B side.

  Furthermore, according to the first embodiment, the first organic EL element 12 and the second organic EL element 13 can be manufactured by using the first electrode layer 16 and the organic EL layer 17 in common. Become. For this reason, since the 1st organic EL element 12 and the 2nd organic EL element 13 can be formed efficiently, the manufacturing process of the organic EL panel 1 is simplified, productivity is raised, and manufacturing cost is suppressed. be able to.

  Moreover, since 1st and 2nd organic EL elements have only the one organic EL layer 17, although 1st Embodiment is the organic EL panel 1 of a double-sided light emission type, It can be formed to an equivalent thickness.

  In addition, arrangement | positioning of the 1st and 2nd laminated bodies 12a and 13a in the 1st and 2nd organic EL elements 12 and 13 is not limited to the alternate arrangement | positioning mentioned above, It is necessary to obtain desired light. It may be changed accordingly.

  Hereinafter, organic EL panels of other embodiments and modifications will be described with reference to the drawings. In other embodiments and modifications, the same components as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted.

(Modification 1)
Here, a modified example of the arrangement of the first and second stacked bodies 12a and 13a in the first and second organic EL elements 12 and 13 will be described. FIG. 2 is a cross-sectional view showing the first and second organic EL elements 12 and 13 of the organic EL panel according to Modification 1 of the first embodiment.

  As shown in FIG. 2, in Modification 1, in the in-plane direction of the glass substrate 11, the plurality of first stacked bodies 12 a included in the first organic EL element 12 are arranged at one end side with a predetermined interval. In addition, a plurality of second stacked bodies 13 a included in the second organic EL element 13 are arranged at a predetermined interval on the other end side.

  According to the first modification, only the one end side of the glass substrate 11 is caused to emit light by the first organic EL element 12 on the surface A side, and only the other end side of the glass substrate 11 is caused to emit the second organic EL element 13 on the back surface B side. Can emit light. Therefore, in the first modification, it is possible to make each light emitting area different between the front surface A and the back surface B.

(Modification 2)
FIG. 3 is a cross-sectional view showing the first and second organic EL elements 12 and 13 of the organic EL panel according to Modification 2 of the first embodiment.

  As shown in FIG. 3, in the second modification, in the in-plane direction of the glass substrate 11, the plurality of first stacked bodies 12 a included in the first organic EL element 12 are arranged at predetermined intervals in the center. In addition, a plurality of second stacked bodies 13a included in the second organic EL element 13 are arranged at predetermined intervals on the outer peripheral portion.

  According to the modified example 2, only the central portion of the glass substrate 11 is caused to emit light by the first organic EL element 12 on the front surface A side, and only the outer peripheral portion of the glass substrate 11 is the second organic EL element 13 on the back surface B side. Can emit light. Therefore, in the second modification, as in the first modification, it is possible to make the light emitting areas different between the front surface A and the back surface B.

  Further, by appropriately adjusting the number of the plurality of first stacked bodies 12 a included in the first organic EL element 12 and the number of the plurality of second stacked bodies 13 a included in the second organic EL element 13, It is possible to easily adjust the light amount ratio between the light amount on one surface side and the light amount on the other surface side on the front surface A side and the back surface B side. According to this configuration, for example, in the organic EL panel 1, when the light amount on the front surface A side is relatively increased and the light amount on the back surface B side is relatively decreased, the light emitted from the front surface A side is directly illuminated. It is possible to use the light emitted from the back B side as the indirect illumination light.

  Further, for example, in the in-plane direction of the glass substrate 11, the distribution ratio between the first stacked body 12a group that emits light on the front surface A side and the second stacked body 13a group that emits light on the back surface B side You may change according to the position in a direction. For example, the organic EL panel 1 may be configured such that the light emission state of the illumination light is different between the front surface A side and the back surface B side, and the light emission state changes at a position in the surface direction.

(Second Embodiment)
FIG. 4 is a cross-sectional view schematically showing an organic EL panel according to the second embodiment. The second organic EL element in the second embodiment is different from the first embodiment in that the first organic EL element 12 in the first embodiment is arranged in the direction opposite to the stacking direction. .

  As shown in FIG. 4, the second organic EL element 23 of the organic EL panel 2 of the second embodiment includes the reflective layer 20 and the first electrode layer of the second organic EL element 13 of the first embodiment. Instead of 16, a second electrode layer 18 is provided. The second organic EL element 23 includes, in order from the glass substrate 11 side, a second electrode layer 18 as a third electrode layer, an organic EL layer 17 as a second organic EL layer, and a first electrode layer. 16 and.

  The second organic EL element 23 is disposed at a distance from the first organic EL element 12 in the in-plane direction of the glass substrate 11, and emits light toward the back surface B side as the other side in the stacking direction. To emit. Similarly to the first organic EL element 12, the second organic EL element 23 includes a plurality of elements arranged on the glass substrate 11 with a predetermined interval with respect to the in-plane direction of the glass substrate 11. The second stacked body 23a is included. The first laminated body 12a and the second laminated body 23a are alternately arranged with respect to the in-plane direction of the glass substrate 11 and are arranged at intervals.

  The organic EL layer 17 of the second organic EL element 23 is laminated in the order of the electron injection layer, the electron transport layer, the light emitting layer, the hole transport layer, and the hole injection layer from the second electrode layer 18 side. The organic EL layer 17 of the first organic EL element 12 is formed in the opposite direction.

  Also in the organic EL panel 2, a plurality of gaps are formed depending on the gap between the first organic EL element 12 and the second organic EL element 23, that is, the gap between the first stacked body 12a and the second stacked body 23a. The light transmission portion 21 is configured. Thus, the organic EL panel 2 has a plurality of light transmission portions 21 so that the transparency is ensured.

  In the manufacturing process of the second embodiment configured as described above, each step of forming the first organic EL element 12 in the first embodiment is performed, and the first organic EL element 12 is formed. The second organic EL element 23 is formed by performing the steps in the reverse order. The step of forming the organic EL layer 17 of the first organic EL element 12 also for each step of forming from the hole injection layer to the electron injection layer constituting the organic EL layer 17 of the second organic EL element 23. This is done in reverse order. Note that the step of forming the second organic EL element 23 may be performed before or after the step of forming the first organic EL element 12, each step of forming the second organic EL element 23, Each step of forming one organic EL element 12 may be performed alternately.

(Behavior of light in the second embodiment)
Also in the organic EL panel 2 of the second embodiment, light emitted from each first stacked body 12a group of the first organic EL element 12 is emitted from the surface A side as in the first embodiment. Moreover, since the 2nd organic EL element 23 is arrange | positioned in the opposite direction to the 1st organic EL element 12 with respect to the lamination direction, the light which each 2nd laminated body 23a group emits from the back surface B side. Emitted. Therefore, when the first and second organic EL elements 12, 23 emit light, both the front surface A and the back surface B emit light.

  Also in the organic EL panel 2, the first and second organic EL elements 12 and 23 are controlled by the control circuit 10, so that the first stacked body 12 a group of the first organic EL elements 12 and the second organic EL panel 12 are controlled. Only one of the second stacked body 23a group of the organic EL elements 23 is selectively lit.

  In addition, during lighting in which only one of the first and second organic EL elements 12 and 23 emits light, the first and first organic EL elements 12 and 23 pass through the light transmitting portion 21 from one surface side of the front surface A side and the back surface B side. The object illuminated by the light emitted from one of the two organic EL elements 12 and 23 can be visually recognized. Further, when the light is turned off, it is possible to visually recognize the other surface side from one surface side of the front surface A side and the back surface B side through the light transmission portion 21.

(Effect of 2nd Embodiment)
Also in the second embodiment, as in the first embodiment, in the double-sided light emitting organic EL panel 2, one surface side of the front surface A side and the rear surface B side emits light when the other surface side is turned on. The surface side can be seen through. Therefore, also in the second embodiment, it is possible to realize various illumination lights combining the transparency at the time of lighting on one surface side and the illumination light on the front surface A side and the illumination light on the back surface B side. Become.

  Also in the second embodiment, the first and second organic EL elements 12 and 23 are not limited to a configuration in which the first and second organic EL elements 12 and 23 are arranged alternately. It may be changed appropriately as required.

  In the first and second embodiments, between the first stacked bodies of the first organic EL elements, between the second stacked bodies of the second organic EL elements, the first stacked body and the second stacked body. In order to prevent a short circuit from occurring between the electrode layers, a configuration in which an insulating material having a light transmitting property is provided in each light transmitting portion between the stacked bodies is desirable.

  Although the embodiments of the present invention have been described, the embodiments are presented as examples and are not intended to limit the scope of the present invention. The embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. The embodiments and modifications thereof are included in the scope of the present invention and the gist thereof, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Organic electroluminescent panel 11 Glass substrate 12 1st organic electroluminescent element 12a 1st laminated body 13 2nd organic electroluminescent element 13a 2nd laminated body 14 Sealing glass 15 Adhesive material 16 1st electrode layer 17 Organic electroluminescence layer 18 Second electrode layer 19 Third electrode layer 20 Reflecting layer 21 Light transmitting portion

Claims (7)

A substrate having optical transparency;
A first organic electroluminescence element that is laminated on the substrate and emits light to one side in the lamination direction;
Second organic electroluminescence which is disposed on the substrate in the in-plane direction with a space therebetween and is stacked on the substrate and emits light to the other side in the stacking direction. With elements;
An organic electroluminescence panel comprising: The first organic electroluminescence element includes a first electrode layer that is laminated on the substrate and has light transmittance, and a first organic electroluminescence layer that is laminated on the first electrode layer. A second electrode layer laminated on the first organic electroluminescence layer and having light reflectivity,
The second organic electroluminescence element includes a reflective layer laminated on the substrate, a third electrode layer laminated on the reflective layer and having light transmittance, and a third electrode layer. 2. The organic material according to claim 1, comprising: a second organic electroluminescence layer laminated thereon; and a fourth electrode layer laminated on the second organic electroluminescence element and having optical transparency. Electroluminescence panel. The first organic electroluminescence element includes a first electrode layer that is laminated on the substrate and has light transparency, an organic electroluminescence layer that is laminated on the first electrode layer, and the organic A second electrode layer laminated on the electroluminescent layer and having light reflectivity,
The second organic electroluminescence element is laminated on the substrate so that the second organic electroluminescence element is opposite to the first organic electroluminescence element with respect to the lamination direction, and the organic electroluminescence layer The organic electroluminescence panel according to claim 1, comprising the first electrode layer.   In the in-plane direction of the substrate, the light emitting region of the first and second organic electroluminescent elements is the total area of the region where the first and second organic electroluminescent elements are spaced from each other. The organic electroluminescence panel according to any one of claims 1 to 3, wherein a ratio of a total area is 10% or more and 90% or less.   The width | variety of the said 1st and 2nd organic electroluminescent element with respect to the direction where the said 1st and 2nd organic electroluminescent element is arrange | positioned at intervals is 10 micrometers or more and 10 mm or less. The organic electroluminescent panel of any one of these.   The organic electroluminescence panel according to any one of claims 1 to 5, further comprising a control unit that controls to emit only one of the first and second organic electroluminescence elements.   The illuminating device which comprises the organic electroluminescent panel of any one of Claim 1 thru | or 6.

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