JP2017157513A - Light-emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-emitting device in which light can be extracted from an end face with higher efficiency.SOLUTION: A light-emitting device includes: a substrate with a first main plane and a second main plane, which is a plane opposite to the first main plane; organic light-emitting elements each including a light-emitting layer provided on the first main plane of the substrate and formed of an organic material, a first electrode formed of a material reflecting light output from the light-emitting layer and covering an upper surface side and a side surface of the light-emitting layer, and a second electrode disposed between the substrate and the light-emitting layer and formed of a material that transmits the light output from the light-emitting layer; and a light guide member disposed below the second electrode, having a light extraction plane along a normal direction of the substrate, and guiding the light, which is output from the light-emitting layer to the substrate side, toward the light extraction plane. The organic light-emitting elements are arranged on the first main plane of the substrate and the light guide member is provided for each organic light-emitting element.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a light emitting device.

  Patent Document 1 describes a light-emitting device in which an organic light-emitting element that emits light using organic EL (EL: Electro-Luminescence) is formed on a substrate. The light emitting device includes one light guide member that guides light output from each of the plurality of organic light emitting elements in the normal direction of the substrate in a direction orthogonal to the normal direction of the substrate. The end surface of the light guide member is a light extraction surface. An end face output type light emitting device as described in Patent Document 1 can be applied as a light source of a printer head (see, for example, Patent Document 2).

JP-A-10-208874 JP 2004-195790 A

  Although the light emitting device described in Patent Document 1 or Patent Document 2 can reduce the area of the light extraction surface as compared with the light emitting device in which the light extraction surface is formed in the normal direction of the substrate, the light extraction efficiency is improved. There is room.

  An object of this invention is to provide the light-emitting device which improved the extraction efficiency of the light from an end surface.

  A light-emitting device according to the present invention includes a substrate having a first main surface and a second main surface opposite to the first main surface, a light-emitting layer provided on the first main surface of the substrate and made of an organic material, and light emission The first electrode is formed of a material that reflects light output from the layer, covers the upper surface side and the side surface of the light emitting layer, and is disposed between the substrate and the light emitting layer, and transmits light output from the light emitting layer. An organic light emitting device including a second electrode formed of a material, and a light extraction surface disposed below the second electrode and extending along the normal direction of the substrate, and outputs light output from the light emitting layer to the substrate side. A plurality of organic light-emitting elements arranged side by side on the first main surface of the substrate, and the light guide member is provided for each organic light-emitting element.

  In this light emitting device, the light output to the substrate side among the diffused light of the light emitting layer is guided to the light extraction surface of the light guide member along the normal direction of the substrate. That is, this light emitting device is configured as an end face output type light emitting device. And in this light-emitting device, the upper surface side and side surface of a light emitting layer are covered with the 1st electrode formed with the reflective material. For this reason, among the diffused light of the light emitting layer, the light output to the upper surface side or the side surface side of the light emitting layer is reflected to the light guide member side by the first electrode. Therefore, this light-emitting device can condense the light toward the upper surface side and the side surface side of the light-emitting layer toward the light guide member side, and can improve the light extraction efficiency. Furthermore, since the light guide member is provided for each organic light emitting element, the size of the light guide member for each organic light emitting element is compared with the case where the light emitting device includes one light guide member for the plurality of organic light emitting elements. Can be adjusted.

  The substrate is formed of a material that transmits light output from the light emitting layer, and the light guide member is formed of glass, polyethylene terephthalate, polyethylene naphthalate, or polyimide that transmits light output from the light emitting layer. 2 may be provided on the main surface side. By comprising in this way, the end surface of the light guide member located in a side with respect to the light extraction surface contacts air. Since glass, polyethylene terephthalate, polyethylene naphthalate, or polyimide has a difference in refractive index with air, leakage of light from the end surface can be suppressed.

  The light emitting device may further include a reflecting member that is disposed in contact with the light guide member and reflects light output from the light emitting layer. With this configuration, the light emitting device can collect light on the light extraction surface.

  The light emitting device according to the present invention includes a substrate having a first main surface and a second main surface opposite to the first main surface, and a light emitting layer made of an organic material provided on the first main surface of the substrate. The first electrode that is formed of a material that reflects light output from the light emitting layer, covers the upper surface side and the side surface of the light emitting layer, and is disposed between the substrate and the light emitting layer, and outputs light output from the light emitting layer. An organic light-emitting element including a second electrode that is formed of a transparent material, has a light extraction surface along the normal direction of the substrate, and guides light output from the light-emitting layer to the substrate side to the light extraction surface; A reflection member disposed between the substrate and the second electrode and reflecting the light output from the light emitting layer, wherein a plurality of organic light emitting elements are formed side by side on the first main surface of the substrate, and the second electrode Is provided for each organic light emitting element.

  With this configuration, the light output from the light emitting layer and transmitted through the second electrode is reflected by the reflecting member and output from the light extraction surface of the second electrode. Thus, since the end surface of the second electrode can be used as a light extraction surface, the light emitting device can improve the light extraction efficiency from the end surface without separately providing a light guide member.

  ADVANTAGE OF THE INVENTION According to this invention, the light-emitting device which improved the extraction efficiency of the light from an end surface is provided.

1 is a schematic perspective view of a light emitting device according to a first embodiment. 1 is a schematic top view of a light emitting device according to a first embodiment. It is sectional drawing of the light-emitting device along the III-III line | wire of FIG.1 and FIG.2. FIG. 4 is a cross-sectional view of the light emitting device taken along line IV-IV in FIGS. It is a top view of the light-emitting device which concerns on the modification of 1st Embodiment. It is a schematic perspective view of the light-emitting device concerning a 2nd embodiment. It is sectional drawing of the light-emitting device along the VII-VII line of FIG. It is sectional drawing of the light-emitting device along the VIII-VIII line of FIG. It is a schematic perspective view of the light-emitting device concerning a 3rd embodiment. It is sectional drawing of the light-emitting device along the XX line of FIG. It is sectional drawing of the light-emitting device along the XI-XI line of FIG.

  Hereinafter, embodiments will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same or an equivalent part, and the overlapping description is abbreviate | omitted.

(First embodiment)
First, a schematic configuration of the light emitting device 1 according to the first embodiment will be described. FIG. 1 is a schematic perspective view of a light emitting device 1 according to the first embodiment. FIG. 2 is a schematic top view of the light emitting device 1 according to the first embodiment.

  As shown in FIG. 1, the light-emitting device 1 is an edge-emitting light-emitting device that emits light along an arrow A, and is used for a printer head, for example. The light emitting device 1 includes an element substrate (substrate) 2 and a plurality of organic light emitting elements 3 formed on the element substrate 2.

  The element substrate 2 has a flat plate shape, and has a front surface (first main surface) 2a and a back surface (second main surface) 2b which is the opposite surface of the front surface 2a. The element substrate 2 is formed of a material that transmits the light output from the organic light emitting element 3, and has translucency with respect to the light output from the organic light emitting element 3. The element substrate 2 is formed of, for example, glass or polyethylene terephthalate (PET). As shown in FIG. 2, the element substrate 2 has a substantially rectangular shape in plan view. The thickness of the element substrate 2 is, for example, 50 μm to 1000 μm. In addition, the planar view in this embodiment is to see from the opposing direction (normal direction of the element substrate 2) of the front surface 2a and the back surface 2b.

  A plurality of organic light emitting elements 3 are formed side by side on the surface 2 a of the element substrate 2. The organic light emitting device 3 is a multilayer electronic device having a pair of electrodes and a light emitting layer disposed between the pair of electrodes and made of a light emitting organic compound (organic material). Electrons and holes are injected into the light emitting layer from a pair of electrodes. The electrons and holes recombine to generate excitons, and light is emitted when the excitons return to the ground state.

  FIG. 3 is a cross-sectional view of the light emitting device 1 taken along line III-III in FIGS. 1 and 2. FIG. 4 is a cross-sectional view of the light emitting device 1 taken along the line IV-IV in FIGS. 1 and 2. As shown in FIGS. 3 and 4, each of the organic light emitting elements 3 includes an anode (second electrode) 10, an organic light emitting unit 12, and a cathode (first electrode) 20 that are sequentially stacked on the element substrate 2. . As shown in FIG. 2, the anode 10 is patterned in a band shape in plan view, and extends along a direction orthogonal to the juxtaposed direction of the organic light emitting elements 3. The cathode 20 is patterned in a band shape in plan view and extends along the direction in which the organic light emitting elements 3 are arranged. That is, the cathode 20 is shared by the plurality of organic light emitting elements 3. The organic light emitting unit 12 is provided at a position where the anode 10 and the cathode 20 overlap in a plan view. The term “on the substrate” means above the element substrate 2 and is not only provided in contact with the surface 2 a of the element substrate 2 but also has a layer or space interposed between the element substrate 2 and the element substrate 2. Means good.

  The anode 10 is an electrode of the organic light emitting element 3 and has conductivity. The anode 10 is located closest to the element substrate 2 in the organic light emitting element 3. The anode 10 is formed of a material that transmits the light output from the organic light emitting unit 12. The anode 10 is made of, for example, ITO (indium tin oxide) or IZO (indium zinc oxide). The thickness of the anode 10 is, for example, 100 nm to 500 nm. The anode 10 is formed in a patterned state by a PVD method (physical vapor deposition method) such as an evaporation method using an electron beam, a vacuum evaporation method, or a sputtering method. The anode 10 is covered with an insulating layer 11 except for a part of its surface (region 10b facing the organic light emitting unit 12).

  The insulating layer 11 is formed of an insulating material. As the insulating layer 11, for example, an insulating resin such as a thermosetting resin or an ultraviolet curable resin is used.

  The organic light emitting unit 12 is a stacked body that emits light by recombination of injected electrons and holes. The organic light emitting unit 12 is provided in the region 10 b of the anode 10 that is not covered with the insulating layer 11. The thickness of the organic light emitting unit 12 is, for example, 100 nm to 500 nm. The organic light emitting unit 12 is a stacked body in which a hole transport layer 13, a light emitting layer 14, and an electron transport layer 15 are stacked in this order.

  The hole transport layer 13 is a layer containing a substance having a function of transporting holes injected from the anode 10. As such a substance, for example, an organic compound such as an aromatic amine compound, a carbazole derivative, or an aromatic hydrocarbon is used. The absolute value of the highest occupied molecular orbital (HOMO) of the substance constituting the hole transport layer 13 is larger than the absolute value of the work function of the substance constituting the anode 10. The thickness of the hole transport layer 13 is, for example, 50 nm to 1000 nm. The hole transport layer 13 is provided on the surfaces of the anode 10 and the insulating layer 11 by, for example, a vacuum evaporation method.

  The light emitting layer 14 is a layer made of an organic material and containing at least a light emitting substance. The light emitting layer 14 is provided so as to overlap the region 10 b of the anode 10 with the hole transport layer 13 interposed therebetween. In other words, the light emitting layer 14 is provided on the surface of the hole transport layer 13. The luminescent material may be a fluorescent material or a phosphorescent material. As the fluorescent substance, various organic compounds or organometallic complexes are used. As the phosphor, for example, an organometallic complex such as an iridium complex is used. The light generated by the light emitting layer 14 may be monochromatic light such as red light or blue light, or may be white light. The thickness of the light emitting layer 14 is, for example, 5 nm to 500 nm. The light emitting layer 14 is patterned by, for example, a vacuum deposition method using a mask.

  The electron transport layer 15 is a layer containing a substance having a function of transporting electrons injected from the cathode 20. As such a substance, for example, an organic compound such as triazole or oxazole, or an organometallic complex is used. The absolute value of the lowest unoccupied molecular orbital (LUMO) of the material constituting the electron transport layer 15 is smaller than the absolute value of the work function of the material constituting the cathode 20. The electron transport layer 15 has a thickness of 1 nm to 300 nm, for example. The electron transport layer 15 is patterned on the surface of the light emitting layer 14 by, for example, a vacuum deposition method using a mask.

  The cathode 20 is an electrode of the organic light emitting device 3 and has conductivity. The cathode 20 is provided on the hole transport layer 13, the light emitting layer 14, and the electron transport layer 15. That is, the cathode 20 is provided so as to cover the upper surface side of the light emitting layer 14. Further, the cathode 20 is provided so as to cover the side surface 14 a of the light emitting layer 14 and the side surface 15 a of the electron transport layer 15. The cathode 20 is formed of a material that reflects the light output from the organic light emitting unit 12. The cathode 20 is composed of, for example, a single layer or a plurality of layers. As the material (conductive material) of the layer constituting the cathode 20, for example, aluminum, silver, or alkaline earth metal (magnesium, calcium, etc.) is used. The thickness of the cathode 20 is, for example, 100 nm to 500 nm. The cathode 20 is formed by a PVD method such as an evaporation method using an electron beam, a vacuum evaporation method, or a sputtering method.

  The light emitting device 1 includes a light guide member 40 disposed below the organic light emitting element 3 (or the light emitting layer 14). The light guide member 40 is provided for each organic light emitting element 3. In the present embodiment, the light guide member 40 is provided on the back surface 2 b of the element substrate 2. The light guide member 40 has a light extraction surface 40 a along the normal direction of the element substrate 2. The light guide member 40 has a substantially rectangular parallelepiped shape, for example. The light extraction surface 40 a is one of the end faces in the direction orthogonal to the parallel direction of the organic light emitting elements 3 among the end faces along the normal direction of the element substrate 2. The light guide member 40 is formed of a material that transmits light output from the light emitting layer 14. The light guide member 40 is formed of, for example, glass, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide film, or the like. The light guide member 40 guides the light output from the light emitting layer 14 to the element substrate 2 side to the light extraction surface 40a. The thickness of the light guide member 40 is, for example, 50 nm to 5 mm. The light guide member 40 is attached to the back surface 2b of the element substrate 2 with an adhesive that transmits light output from the light emitting layer 14, for example.

  As described above, in the light emitting device 1 according to the first embodiment, the light output to the element substrate 2 among the diffused light of the light emitting layer 14 is the light extraction surface of the light guide member 40 along the normal direction of the element substrate 2. It is guided to 40a. That is, the light emitting device 1 is configured as an end face output type light emitting device. And in this light-emitting device 1, the upper surface side and side surface 14a of the light emitting layer 14 are covered with the cathode 20 formed with the reflecting material. For this reason, of the diffused light of the light emitting layer 14, the light output to the upper surface side or the side surface 14 a side of the light emitting layer 14 is reflected by the cathode 20 toward the light guide member 40 side. Therefore, this light-emitting device 1 can condense the light toward the upper surface side and the side surface 14a side of the light-emitting layer 14 toward the light guide member 40 side, and can improve the light extraction efficiency.

  Furthermore, since the light guide member 40 is provided for each organic light emitting element 3, the light guide member 40 is provided for each organic light emitting element 3 as compared with the case where the light emitting device includes one light guide member for the plurality of organic light emitting elements. The size, shape, etc. can be adjusted. That is, it can be adjusted for each organic light emitting element 3 so that light can be easily extracted from the end face direction according to the characteristics (wavelength, etc.) of the light emitted from the light emitting layer 14. For example, the light emitting device 1 can set the distance from each organic light emitting element 3 to the light extraction surface 40 a for each organic light emitting element 3. For this reason, compared with the case where a light-emitting device is provided with one light guide member with respect to a some organic light emitting element, this light-emitting device 1 is light extraction surface 40a from the organic light emitting element 3 with the positional relationship of the adjacent organic light emitting element 3. Can be avoided. For this reason, this light-emitting device 1 can suppress a reduction in light extraction efficiency for each organic light-emitting element 3.

  Furthermore, in the light emitting device 1 according to the first embodiment, since the light guide member 40 is provided on the back surface 2b side of the element substrate 2, the light guide member 40 positioned on the side with respect to the light extraction surface 40a. End face is in contact with air. Taking glass as an example of the material of the light guide member 40, the refractive index of the glass is about 1.6 and the air is 1.0. Therefore, light having an incident angle is totally reflected at the interface between the light guide member 40 and air. That is, the light leakage in the direction orthogonal to the light extraction direction (arrow A in FIG. 1) can be suppressed by bringing the end surface of the light guide member 40 located on the side of the light extraction surface 40a into contact with air. Therefore, the light emitting device 1 can improve the light extraction efficiency.

(Modification of the first embodiment)
A modification of the light emitting device 1 according to the first embodiment will be described. In the light emitting device 1 according to the first embodiment, the plurality of organic light emitting elements 3 are formed in a line. On the other hand, in the light emitting device 1 ′ according to the modification, the plurality of organic light emitting elements 3 are formed side by side so as to be in a staggered arrangement. The other configuration of the light emitting device 1 ′ is the same as that of the light emitting device 1. FIG. 5 is a top view of a light emitting device 1 ′ according to a modification. As shown in FIG. 5, the light emitting device 1 ′ according to the modification includes five organic light emitting elements 3. Each organic light emitting element 3 includes an organic light emitting unit 12 between each anode 10 and a common cathode 20. The light output from the organic light emitting unit 12 is output from the end face as with the light emitting device 1 (arrow A in FIG. 5). The organic light emitting elements 3 adjacent to each other in the parallel direction of the organic light emitting elements 3 (direction orthogonal to the arrow A in FIG. 5) are arranged so as not to overlap in the parallel direction. As described above, by arranging the plurality of organic light emitting elements 3 in a staggered manner, the interval between the adjacent organic light emitting elements 3 can be shortened as compared with the case where the plurality of organic light emitting elements 3 are arranged in a line. As a result, the overall size of the light emitting device can be reduced. Further, by shortening the interval between adjacent organic light emitting elements 3, the degree of integration in the parallel direction can be increased, so that the exposure efficiency is improved. In addition, the light emitting device 1 ′ according to the modification can improve the light extraction efficiency from the end face, similarly to the light emitting device 1 according to the first embodiment.

(Second Embodiment)
The light emitting device 1A according to the second embodiment is different from the light emitting device 1 according to the first embodiment in that the reflective member 50 is provided. In 2nd Embodiment, the same code | symbol is attached | subjected to the part which is common in the light-emitting device 1, and description is abbreviate | omitted.

  FIG. 6 is a schematic perspective view of a light emitting device 1A according to the second embodiment. 7 is a cross-sectional view of the light emitting device 1A along the line VII-VII in FIG. FIG. 8 is a cross-sectional view of the light emitting device 1A along the line VIII-VIII in FIG. As shown in FIGS. 6, 7, and 8, the light emitting device 1 </ b> A includes a reflecting member 50.

  The reflection member 50 is disposed in contact with the light guide member 40. The reflection member 50 is disposed so as to cover an end surface of the light guide member 40 other than the light extraction surface 40a. Specifically, the reflecting member 50 is disposed so as to cover the lower surface 40b and both side surfaces 40c and 40d of the light guide member 40 shown in FIG. 7 and the end surface 40e which is the opposite surface of the light extraction surface 40a shown in FIG. Is done. The reflecting member 50 reflects the light output from the light emitting layer 14. The reflecting member 50 is made of, for example, metal. The reflecting member 50 is made of aluminum or silver. The thickness of the reflecting member 50 is, for example, 3 nm to 500 nm. The reflecting member 50 is formed by a PVD method such as an evaporation method using an electron beam, a vacuum evaporation method, or a sputtering method. The other components of the light emitting device 1A are the same as the components of the light emitting device 1.

  As described above, in the light emitting device 1 </ b> A according to the second embodiment, the light output from the diffused light of the light emitting layer 14 to the element substrate 2 side by the reflecting member 50 that covers the end surface other than the light extraction surface 40 a of the light guide member 40. The light is condensed on the light extraction surface 40 a of the light guide member 40 along the normal direction of the element substrate 2. Therefore, the light emitting device 1A can improve the light extraction efficiency. Further, since the end surface 40e, which is the opposite surface of the light extraction surface 40a, is covered with the reflecting member 50, the light extraction efficiency can be further improved.

(Third embodiment)
The light emitting device 1B according to the third embodiment is different from the light emitting device 1 according to the first embodiment in that the anode 10 exhibits the function of a light guide member. In 3rd Embodiment, the same code | symbol is attached | subjected to the part which is common in the light-emitting device 1, and description is abbreviate | omitted.

  FIG. 9 is a schematic perspective view of a light emitting device 1B according to the third embodiment. FIG. 10 is a cross-sectional view of the light-emitting device 1B along the line XX of FIG. 11 is a cross-sectional view of the light-emitting device along the line XI-XI in FIG. As shown in FIGS. 9, 10, and 11, the light emitting device 1B does not include the light guide member 40, and includes the anode 10 having the light extraction surface 10a and the reflection member 50B.

  The anode 10 is provided for each organic light emitting element 3, is disposed between the element substrate 2 and the light emitting layer 14, and has a light extraction surface 10 a along the normal direction of the element substrate 2. The light extraction surface 10 a is one of the end faces in the direction orthogonal to the parallel direction of the organic light emitting elements 3 among the end faces along the normal direction of the element substrate 2. The anode 10 guides the light output from the light emitting layer 14 to the element substrate 2 side to the light extraction surface 10a.

  The reflecting member 50 </ b> B is disposed between the element substrate 2 and the anode 10. Specifically, the reflecting member 50 </ b> B is disposed in contact with the anode 10. The reflecting member 50B is disposed so as to cover the lower surface 10c of the anode 10 shown in FIG. 11 and the end surface 10d that is the opposite surface of the light extraction surface 10a. The reflecting member 50 </ b> B reflects the light output from the light emitting layer 14. The reflecting member 50B is made of metal, for example. The reflecting member 50B is formed of aluminum or silver. The thickness of the reflecting member 50B is, for example, 10 nm to 500 nm. The reflecting member 50B is formed by a PVD method such as an evaporation method using an electron beam, a vacuum evaporation method, or a sputtering method. The other components of the light emitting device 1B are the same as the components of the light emitting device 1.

  As described above, in the light emitting device 1 </ b> B according to the third embodiment, the anode 10 functioning as a light guide member is formed on the surface 2 a side of the element substrate 2. A reflective member 50B is disposed below the anode 10. Thereby, the light output from the light emitting layer 14 and transmitted through the anode 10 is reflected by the reflecting member 50B and output from the light extraction surface 10a of the anode 10. Thus, since the end surface of the anode 10 can be used as the light extraction surface 10a, the light emitting device 1B can improve the light extraction efficiency from the end surface without separately providing a light guide member. Further, since the end surface 10d, which is the opposite surface of the light extraction surface 10a, is covered with the reflecting member 50B, the light extraction efficiency can be further improved.

  The light emitting device according to the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the organic light emitting device 3 may have a hole injection layer in addition to the hole transport layer 13. In this case, the hole injection layer is provided between the anode 10 and the hole transport layer 13. The absolute value of the HOMO of the hole injection layer is not less than the absolute value of the work function of the anode 10 and may be less than the absolute value of the HOMO of the hole transport layer 13. Similarly, the organic light emitting device 3 may have an electron injection layer in addition to the electron transport layer 15. In this case, the electron injection layer is provided between the electron transport layer 15 and the cathode 20. The absolute value of the LUMO of the electron injection layer is less than the absolute value of the work function of the cathode 20 and may be greater than or equal to the absolute value of the LUMO of the electron transport layer 15.

  Further, the light emitting device 1 and the light guide member 40 of the light emitting device 1 </ b> A may be formed integrally with the element substrate 2. For example, the light guide member 40 may be formed by processing the back surface 2b of the element substrate 2 by etching or the like. In addition, the light guide member 40 of the light emitting device 1, the light guide member 40 of the light emitting device 1 </ b> A, and the reflection member 50 may be provided between the anode 10 and the element substrate 2. In this case, the element substrate 2 may not be formed of a material that transmits the light output from the light emitting layer 14, and may be formed of a material that reflects the light output from the light emitting layer 14.

  The element substrate 2 of the light emitting device 1B may not be formed of a material that transmits light output from the light emitting layer 14, and is formed of a material that reflects light output from the light emitting layer 14. Also good. The reflecting member 50 of the light emitting device 1A and the reflecting member 50B of the light emitting device 1B do not have to be provided for each light guide member 40 or each anode 10, and cover the plurality of light guide members 40 or the plurality of anodes 10. May be. Further, the reflecting member 50 of the light emitting device 1A and the reflecting member 50B of the light emitting device 1B may cover a part of the light guide member 40 or the anode 10. Even in such a case, the light extraction efficiency from the end face can be improved.

  DESCRIPTION OF SYMBOLS 1,1 ', 1A, 1B ... Light-emitting device, 2 ... Element board | substrate (board | substrate), 2a ... Front surface (1st main surface), 2b ... Back surface (2nd main surface), 3 ... Organic light emitting element, 10 ... Anode ( 2nd electrode), 12 ... organic light emitting part, 14 ... light emitting layer, 20 ... cathode (first electrode), 40 ... light guide member, 50, 50B ... reflecting member.

Claims (4)

A substrate having a first main surface and a second main surface opposite to the first main surface;
A light emitting layer made of an organic material provided on the first main surface of the substrate, a first electrode formed of a material that reflects light output from the light emitting layer, and covering an upper surface side and a side surface of the light emitting layer; And an organic light emitting device including a second electrode that is disposed between the substrate and the light emitting layer and formed of a material that transmits light output from the light emitting layer;
A light guide member disposed under the second electrode, having a light extraction surface along a normal direction of the substrate, and guiding light output from the light emitting layer to the substrate side to the light extraction surface When,
With
A plurality of the organic light emitting elements are formed side by side on the first main surface of the substrate,
The light guide member is provided for each organic light emitting element.
Light emitting device. The substrate is formed of a material that transmits light output from the light emitting layer,
2. The light emitting device according to claim 1, wherein the light guide member is formed of glass, polyethylene terephthalate, polyethylene naphthalate, or polyimide that transmits light output from the light emitting layer, and is provided on the second main surface side of the substrate. apparatus.   The light emitting device according to claim 1, further comprising a reflecting member that is disposed in contact with the light guide member and reflects light output from the light emitting layer. A substrate having a first main surface and a second main surface opposite to the first main surface;
A light emitting layer made of an organic material provided on the first main surface of the substrate, a first electrode formed of a material that reflects light output from the light emitting layer, and covering an upper surface side and a side surface of the light emitting layer; And the light emitting layer is disposed between the substrate and the light emitting layer, is formed of a material that transmits light output from the light emitting layer, and has a light extraction surface along a normal direction of the substrate. An organic light emitting device including a second electrode for guiding light output from the substrate to the light extraction surface;
A reflective member that is disposed between the substrate and the second electrode and reflects light output from the light emitting layer;
With
A plurality of the organic light emitting elements are formed side by side on the first main surface of the substrate,
The second electrode is provided for each organic light emitting element.
Light emitting device.

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