WO2018025576A1

WO2018025576A1 - Light emitting device

Info

Publication number: WO2018025576A1
Application number: PCT/JP2017/024901
Authority: WO
Inventors: 秀雄工藤
Original assignee: パイオニア株式会社
Priority date: 2016-08-04
Filing date: 2017-07-07
Publication date: 2018-02-08

Abstract

A light emitting device (10) is, for instance, an illuminating device or a display device. According to the embodiment of the present invention, the light emitting device (10) is provided with a plurality of light emitting sections (140) and translucent sections (104). The translucent sections (104) are positioned among the light emitting sections (140). Each of the light emitting sections (140) has an organic layer 120, including a first sub organic layer (121) and a second sub organic layer (122). In each of the light emitting sections (140), the first sub organic layer (121) and the second sub organic layer (122) overlap each other, and in each of the translucent sections (104), the area of the first sub organic layer (121) is larger than the area of the second sub organic layer (122).

Description

Light emitting device

The present invention relates to a light emitting device.

In recent years, the development of light-emitting devices using organic EL has progressed. This light-emitting device is used as a lighting device or a display device, and has a configuration in which an organic layer is sandwiched between a first electrode and a second electrode. In general, a transparent material is used for the first electrode, and a metal material is used for the second electrode.

One of light-emitting devices using organic EL is a technique described in Patent Document 1. In the technique of Patent Document 1, the second electrode is provided only in a part of the pixel so that the display device using the organic EL has light transmittance (see-through). In such a structure, since the region positioned between the plurality of second electrodes transmits light, the display device can have light transmittance.

JP 2011-23336 A

In a transmissive light-emitting device that wants to extract light only from one side (front side), a first electrode and a second electrode caused by a short circuit between the first electrode and the second electrode, an edge of the patterned first electrode, or the like In order to prevent a leakage current between the light transmitting portion and the light transmitting portion, an organic layer may be formed. However, in that case, the light transmissivity of the translucent part is lowered.

As a problem to be solved by the present invention, in a transmissive light emitting device, for example, securing a high light transmittance while suppressing a short circuit between electrodes and a leakage current can be cited.

The invention described in claim 1
A plurality of light emitting units, and a light transmitting unit located between the plurality of light emitting units,
Each of the plurality of light emitting units includes an organic layer including a first sub organic layer and a second sub organic layer,
In the light emitting unit, the first sub-organic layer and the second sub-organic layer overlap each other,
In the light transmissive part, the area of the first sub organic layer is a light emitting device larger than the area of the second sub organic layer.

The above-described object and other objects, features, and advantages will be further clarified by a preferred embodiment described below and the following drawings attached thereto.

1 is a cross-sectional view showing a configuration of a light emitting device according to a first embodiment. It is the figure which expanded the light emission part. 1 is a plan view of a light emitting device according to a first embodiment. 6 is a cross-sectional view illustrating a configuration of a light emitting device according to Modification Example 1. FIG. FIG. 11 is a cross-sectional view illustrating a configuration of a light emitting device according to Modification 2. FIG. 11 is a cross-sectional view illustrating a configuration of a light emitting device according to Modification 3. It is sectional drawing which shows the structure of the light-emitting device which concerns on the modification 4. It is sectional drawing which shows the structure of the light-emitting device which concerns on 2nd Embodiment. 6 is a cross-sectional view illustrating a configuration of a light emitting device according to Modification Example 1. FIG. FIG. 11 is a cross-sectional view illustrating a configuration of a light emitting device according to Modification 2. FIG. 11 is a cross-sectional view illustrating a configuration of a light emitting device according to Modification 3. It is sectional drawing which shows the structure of the light-emitting device which concerns on the modification 4. FIG. 10 is a cross-sectional view illustrating a configuration of a light emitting device according to Modification Example 5. It is sectional drawing of the light-emitting device which concerns on the modification 6. FIG. It is a top view of the light-emitting device shown in FIG. It is sectional drawing which shows the structure of the light-emitting device which concerns on 3rd Embodiment. It is the figure which expanded the light emission part. 6 is a cross-sectional view illustrating a configuration of a light emitting device according to Modification Example 1. FIG. FIG. 11 is a cross-sectional view illustrating a configuration of a light emitting device according to Modification 2. FIG. 11 is a cross-sectional view illustrating a configuration of a light emitting device according to Modification 3. It is sectional drawing which shows the structure of the light-emitting device which concerns on the modification 4. It is sectional drawing which shows the structure of the light-emitting device which concerns on an Example. It is a top view of the light-emitting device shown in FIG. It is the figure which remove | excluded the 1st sub organic layer, the 2nd sub organic layer, and the 3rd sub organic layer from FIG. It is a figure which shows the 1st modification of the light-emitting device which concerns on an Example. It is a figure which shows the 2nd modification of the light-emitting device which concerns on an Example. It is a figure which shows the 3rd modification of the light-emitting device which concerns on an Example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same reference numerals are given to the same components, and the description will be omitted as appropriate.

(First embodiment)
FIG. 1 is a cross-sectional view illustrating a configuration of a light emitting device 10 according to the first embodiment. The supervisor P looks at the light emission surface of the light emitting device 10 from a direction perpendicular to the substrate 100 in FIG. FIG. 2 is an enlarged view of the light emitting unit 140. The light emitting device 10 according to the present embodiment is, for example, a lighting device or a display device. The light emitting device 10 according to the present embodiment includes a plurality of light emitting units 140 and a light transmitting unit 104. The light transmitting unit 104 is located between the plurality of light emitting units 140. Each of the plurality of light emitting units 140 includes an organic layer 120 including a first sub organic layer 121 and a second sub organic layer 122. In the light emitting unit 140, the first sub organic layer 121 and the second sub organic layer 122 overlap each other. In the light transmitting unit 104, the area of the first sub organic layer 121 is larger than the area of the second sub organic layer 122. Is also big. This will be described in detail below.

In the light emitting device 10, each of the plurality of light emitting units 140 includes a stacked structure of the first electrode 110 and the second electrode 130. At least a part of the first sub organic layer 121 and at least a part of the second sub organic layer 122 are located between the first electrode 110 and the second electrode 130.

The light emitting device 10 according to this embodiment further includes a substrate 100. The light emitting unit 140 is formed on at least the first surface 101 of the substrate 100.

The substrate 100 is a light-transmitting substrate such as a glass substrate or a resin substrate. The substrate 100 may have flexibility. In the case of flexibility, the thickness of the substrate 100 is, for example, not less than 10 μm and not more than 1000 μm. The substrate 100 is, for example, a polygon such as a rectangle or a circle. When the substrate 100 is a resin substrate, the substrate 100 is formed using, for example, PEN (polyethylene naphthalate), PES (polyethersulfone), PET (polyethylene terephthalate), or polyimide. When the substrate 100 is a resin substrate, an inorganic barrier film such as SiN _x or SiON is formed on at least one surface (preferably both surfaces) of the substrate 100 in order to prevent moisture from permeating the substrate 100. It is preferable.

The light emitting unit 140 has a configuration in which the first electrode 110, the organic layer 120, and the second electrode 130 are stacked in this order. When the light emitting device 10 is a lighting device, the plurality of light emitting units 140 may extend in a line shape. On the other hand, when the light emitting device 10 is a display device, the plurality of light emitting units 140 are arranged so as to form a matrix, or form a segment or display a predetermined shape (for example, display icons). It may be. The plurality of light emitting units 140 are formed for each pixel.

The first electrode 110 is a transparent electrode having translucency. The transparent conductive material constituting the transparent electrode is a metal-containing material, for example, a metal oxide such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), IWZO (Indium Tungsten Zinc Oxide), ZnO (Zinc Oxide), and the like. is there. The thickness of the first electrode 110 is, for example, not less than 10 nm and not more than 500 nm. The first electrode 110 is formed using, for example, a sputtering method or a vapor deposition method. The first electrode 110 may be a carbon nanotube or a conductive organic material such as PEDOT / PSS. The first electrode 110 is, for example, an anode.

The second electrode 130 is made of, for example, a metal selected from the first group consisting of Al, Au, Ag, Pt, Mg, Sn, Zn, and In or an alloy of a metal selected from the first group. Contains a metal layer. In this case, the second electrode 130 has a light shielding property. The thickness of the second electrode 130 is, for example, not less than 10 nm and not more than 500 nm. However, the second electrode 130 may be formed using the material exemplified as the material of the first electrode 110. The second electrode 130 is formed using, for example, a sputtering method or a vapor deposition method. The second electrode 130 is, for example, a cathode.

Note that the materials of the first electrode 110 and the second electrode 130 described above are used when light is transmitted through the substrate 100, that is, when light emission from the light emitting device 10 is performed through the substrate 100 (that is, bottom emission type). It is an example. In other cases, light may pass through the side opposite to the substrate 100. That is, the light emission from the light emitting device 10 is performed without passing through the substrate 100 (top emission type). In the top emission type, one of two types of stacked structures of a reverse product type and a forward product type can be adopted. In the reverse product type, the material of the first electrode 110 and the material of the second electrode 130 are opposite to those of the bottom emission type. That is, the material of the second electrode 130 is used as the material of the first electrode 110, and the material of the first electrode 110 is used as the material of the second electrode 130. In the other stacking type, the material of the first electrode 110 is formed on the material of the second electrode 130 described above, the organic layer 120 is further formed thereon, and the second electrode 130 is further formed thinly thereon. Thus, the light is extracted from the side opposite to the substrate 100. The material for forming the thin film is, for example, the material exemplified as the material of the second electrode 130 or an MgAg alloy. When the second electrode 130 is formed of Al or Ag, the thickness of the second electrode 130 is preferably 30 nm or less. The light emitting device 10 according to the present embodiment may be of any structure of a bottom emission type and the two types of top emission types described above.

1 and 2 show an example of a bottom emission type light emitting device 10. In the example of this figure, the 1st electrode 110 has translucency. The substrate 100 is opposed to the second electrode 130 with the first electrode 110 interposed therebetween. The second electrode 130 has a light shielding property. The first electrode 110 is located between the substrate 100 and the second electrode 130.

In the light emitting unit 140, the organic layer 120 has a configuration in which a plurality of sub organic layers including the first sub organic layer 121 and the second sub organic layer 122 are stacked. Hereinafter, the first sub organic layer 121, the second sub organic layer 122, and the other sub organic layers are collectively referred to simply as “sub organic layers”. In the light emitting unit 140, each sub organic layer functions as at least one of a hole injection layer, a light emitting layer, an electron injection layer, a hole transport layer, an electron transport layer, a hole block layer, and an electron block layer, for example. One sub-organic layer may also serve as a plurality of layers among them. Note that a material for allowing the sub organic layer to function as at least one of a hole injection layer, a light emitting layer, an electron injection layer, a hole transport layer, an electron transport layer, a hole block layer, and an electron block layer is used. When included, the sub organic layer can be said to be a layer having the function. Specifically, for example, when the atomic weight of each layer is analyzed by an analyzer, atoms contained in a material constituting a layer (for example, a hole injection layer) having a function in a certain layer (for example, the first sub-organic layer 121) By confirming the presence, the layer can be identified as a layer having the function. Moreover, you may confirm the function of each sub organic layer by confirming the combination of the material which comprises each sub organic layer among the organic layers 120, and its electrical property.

In the example shown in FIGS. 1 and 2, the organic layer 120 of the light emitting unit 140 includes a first sub organic layer 121, a second sub organic layer 122, and a third sub organic layer 123 stacked in this order from the first electrode 110 side. It has a configuration. As described above, the first electrode 110 is light transmissive. The first sub organic layer 121 is in contact with the first electrode 110. In the light emitting unit 140, for example, the first sub organic layer 121 functions as a hole injection layer, the second sub organic layer 122 functions as a light emitting layer, and the third sub organic layer 123 functions as an electron injection layer. A sub organic layer that functions as a hole transport layer may be further formed between the first sub organic layer 121 and the second sub organic layer 122. Further, a sub organic layer that functions as an electron transport layer may be further formed between the second sub organic layer 122 and the third sub organic layer 123. The organic layer 120 may be formed by a vapor deposition method. In addition, at least one sub-organic layer in the organic layer 120, for example, a layer in contact with the first electrode 110 may be formed by a coating method such as an inkjet method, a printing method, a spin coating method, or a spray method. In this case, the remaining layers of the organic layer 120 may be formed by a vapor deposition method. Moreover, all the layers of the organic layer 120 may be formed using the apply | coating method.

In the example of this drawing, in the light emitting unit 140, the first sub organic layer 121 is located between the second sub organic layer 122 and the first electrode 110. In the light emitting unit 140, the first sub organic layer 121 is in contact with the first electrode 110. The first sub organic layer 121 functions as a hole injection layer in the light emitting unit 140. In this case, the first sub organic layer 121 preferably contains an aromatic amine compound such as an aromatic tertiary amine polymer compound.

FIG. 3 is a plan view of the light emitting device 10 according to the present embodiment. FIG. 1 corresponds to the AA cross section of FIG. In the example of this figure, the light emitting device 10 has a plurality of linear light emitting portions 140. The plurality of light emitting units 140 are disposed apart from each other on the first surface 101 of the substrate 100.

As described above, the translucent part 104 is located between the plurality of light emitting parts 140. In the example of the figure, the light emitting units 140 and the light transmitting units 104 are linear and extend in the same direction. When viewed from the direction perpendicular to the substrate 100, the light emitting portions 140 and the light transmitting portions 104 are alternately arranged. The first sub organic layer 121 is also formed on the light transmitting part 104 located between the light emitting parts 140 on the first surface 101 of the substrate 100.

Further, when viewed from a direction perpendicular to the substrate 100, the light emitting device 10 has a first region 102. The first region 102 is a region overlapping with the second electrode 130. When the second electrode 130 has a light shielding property, the first region 102 is a region that does not transmit light. The translucent portion 104 is a region that does not overlap the second electrode 130. Since the light transmittance of the second electrode 130 is lower than the light transmittance of the first electrode 110, the light transmittance of the light transmitting portion 104 is higher than the light transmittance of the first region 102. The area of the first region 102 may be smaller than the area of the translucent part 104. Further, the area of the substrate 100 where the light emitting part 140 is formed (in other words, the area of the light emitting part) is the area of the substrate 100 where the light emitting part 140 is not formed (in other words, the area of the non-light emitting part). ) May be smaller.

When viewed from a direction perpendicular to the substrate 100, the area of the first sub-organic layer 121 in the light-transmitting portion 104 is larger than the area of the second sub-organic layer 122 in the light-transmitting portion 104. In other words, the second sub organic layer 122 is not formed on at least a part of the light transmitting portion 104. Thus, the light transmittance can be increased by reducing the area of the second sub-organic layer 122 in the light transmitting portion 104. In the example of this figure, specifically, the first sub-organic layer 121 is formed on the entire light transmitting portion 104. In other words, the first sub organic layer 121 is formed continuously with the plurality of light emitting units 140 and the light transmitting unit 104 therebetween.

When viewed from the direction parallel to the thickness direction of the first electrode 110, that is, when viewed from the direction perpendicular to the substrate 100, at least a part of the edge of the first electrode 110 does not overlap the second sub organic layer 122. . As described above, by making the width of the second sub-organic layer 122 smaller than the width of the first electrode 110, the light transmittance of the light transmitting part 104 can be further improved.

Thickness d ₁ of the first sub organic layer is preferably thinner than the thickness d ₂ of the second sub-organic layer. In that case, the translucency of the second sub organic layer 122 is lower than the translucency of the first sub organic layer 121. Therefore, the light transmittance of the light emitting device 10 can be more effectively increased by reducing the area of the second sub-organic layer 122 having low translucency.

In the example shown in FIGS. 1 to 3, the first sub organic layer 121 covers at least part of the edge of the first electrode 110. Specifically, the width of the first sub-organic layer 121 in a cross section (corresponding to FIGS. 1 and 2) perpendicular to the extending direction of the light emitting unit 140 and perpendicular to the substrate 100 is larger than the width of the first electrode 110. . By doing so, the first sub-organic layer 121 is interposed between the edge of the first electrode 110 and the second electrode 130, and edge leakage that may occur at the edge of the first electrode 110 can be suppressed. In addition, when viewed from a direction parallel to the thickness direction of the first electrode 110, at least a part of the edge of the second sub organic layer 122 does not overlap the second electrode 130. Specifically, the width of the second sub organic layer 122 in the cross section perpendicular to the extending direction of the light emitting unit 140 and perpendicular to the substrate 100 is larger than the width of the second electrode 130. By doing so, the second sub-organic layer 122 is further interposed between the edge of the second electrode 130 and the first electrode 110, and a short circuit between the first electrode 110 and the second electrode 130 is further suppressed. can do. Further, some mask displacement can be allowed.

The first sub organic layer 121 is preferably a coating film. The first sub organic layer 121 preferably includes a polymer. In particular, the first sub organic layer 121 preferably includes a polymer having a weight average molecular weight larger than that of the second sub organic layer 122. The first sub organic layer 121 may include a compound having a weight average molecular weight of 3000 or more or a number average molecular weight of 500 or more. In these cases, the edge covering property of the first sub organic layer 121 and the embedding property of foreign matters are enhanced. As a result, it is possible to further reduce the leakage current caused by the edges and foreign matters. When the first sub organic layer 121 is a coating film that functions as a hole injection layer, the first sub organic layer 121 preferably includes an aromatic amine compound such as an aromatic tertiary amine polymer compound.

Of the plurality of sub-organic layers constituting the organic layer 120, the first sub-organic layer 121 is a coating film formed by a coating method, and the second sub-organic layer 122 is a deposition film formed by a deposition method. There may be. In this case, the vapor deposition film is easier to pattern using a mask or the like than the coating film. Therefore, if the first sub organic layer 121 is formed widely over the light emitting part 140 and the light transmitting part 104, the second sub organic layer 122 and other vapor deposition films are formed by patterning in a region narrower than the first sub organic layer 121. The production efficiency of the light emitting device 10 can be improved. In this case, the first sub organic layer 121 is preferably formed in a lower layer than the second sub organic layer 122. That is, the first sub organic layer 121 is preferably located between the substrate 100 and the second sub organic layer 122. Then, the second sub-organic layer 122 can be patterned after the formation of the first sub-organic layer 121, and the film quality is higher than when the first sub-organic layer 121 is formed by coating on the second sub-organic layer 122. A second sub-organic layer 122 with good quality can be obtained.

In the example of this figure, an example in which the first sub organic layer 121 is formed on the entire light transmitting portion 104 is shown, but the first sub organic layer 121 is formed on a part of the light transmitting portion 104. It does not have to be.

Moreover, although the example of this figure has shown the example in which the 2nd sub organic layer 122 and the 3rd sub organic layer 123 are formed with the same pattern, the area | region in which the 2nd sub organic layer 122 is formed, and 1st The region where the three sub organic layers 123 are formed may be different from each other.

Next, a method for manufacturing the light emitting device 10 will be described. First, the first electrode 110 is formed on the substrate 100 by using, for example, a sputtering method. Next, the first electrode 110 is formed into a predetermined pattern using a photolithography method. Next, the first sub organic layer 121 is formed by, for example, a coating method. Next, the second sub organic layer 122, the third sub organic layer 123, and the second electrode 130 are formed in this order. The second sub organic layer 122 and the third sub organic layer 123 can be formed by, for example, a vapor deposition method. These layers are formed in a predetermined pattern using, for example, a mask. The second electrode 130 is also formed in a predetermined pattern using, for example, a mask. Thereafter, the light emitting unit 140 is sealed using a sealing film or a sealing member (not shown).

As described above, according to the present embodiment, the area of the first sub organic layer 121 is larger than the area of the second sub organic layer 122 in the light transmitting portion 104. In other words, the area of the second sub organic layer 122 is smaller than the area of the first sub organic layer 121. Therefore, high light transmittance of the light emitting device 10 can be ensured. In addition, leakage current between the first electrode 110 and the second electrode 130 can be suppressed.

(Modification 1 of the first embodiment)
FIG. 4 is a cross-sectional view illustrating a configuration of the light emitting device 10 according to the first modification. FIG. 4 corresponds to FIG. 2 of the embodiment. The light emitting device 10 of the present modification is the same as the light emitting device 10 according to the embodiment except that at least a part of the edge of the second sub organic layer 122 does not overlap with either the first electrode 110 or the second electrode 130. It is.

Specifically, in the cross section perpendicular to the extending direction of the light emitting unit 140 and perpendicular to the substrate 100, the width of the second sub organic layer 122 is greater than either the width of the first electrode 110 or the width of the second electrode 130. wide. The edge of the first electrode 110 is covered with the second sub organic layer 122. By doing so, the leakage current between the first electrode 110 and the second electrode 130 can be further suppressed.

As described above, also in this modification, the area of the first sub organic layer 121 is larger than the area of the second sub organic layer 122 in the light transmitting portion 104. Therefore, high light transmittance of the light emitting device 10 can be ensured. In addition, since at least a part of the edge of the first electrode 110 is covered with the second sub organic layer 122, the leakage current between the first electrode 110 and the second electrode 130 can be further suppressed.

(Modification 2 of the first embodiment)
FIG. 5 is a cross-sectional view illustrating a configuration of the light emitting device 10 according to the second modification. FIG. 5 corresponds to FIG. 2 of the embodiment. The light emitting device 10 according to the present modification is the same as the light emitting device 10 according to the embodiment except that the second sub organic layer 122 is located between the first sub organic layer 121 and the substrate 100.

In the light emitting unit 140 of this modification, the first sub organic layer 121 is in contact with the second electrode 130. For example, the first sub organic layer 121 functions as an electron injection layer, the second sub organic layer 122 functions as a light emitting layer, and the third sub organic layer 123 functions as a hole injection layer.

As described above, also in this modification, the area of the first sub organic layer 121 is larger than the area of the second sub organic layer 122 in the light transmitting portion 104. Therefore, high light transmittance of the light emitting device 10 can be ensured. In addition, leakage current between the first electrode 110 and the second electrode 130 can be suppressed.

(Modification 3 of the first embodiment)
FIG. 6 is a cross-sectional view illustrating a configuration of the light emitting device 10 according to the third modification. FIG. 6 corresponds to FIG. 2 of the embodiment. The light emitting device 10 of the present modification is the same as the light emitting device 10 according to the embodiment except that the conductive portion 170 is provided.

The conductive part 170 is, for example, an auxiliary electrode of the first electrode 110 and is in contact with the first electrode 110. The conductive portion 170 is formed of a material having a lower resistance value than that of the first electrode 110, and is formed using, for example, at least one metal layer. The conductive portion 170 has a configuration in which, for example, a first metal layer such as Mo or Mo alloy, a second metal layer such as Al or Al alloy, and a third metal layer such as Mo or Mo alloy are stacked in this order. Yes. Of these three metal layers, for example, the second metal layer is the thickest.

The conductive part 170 is covered with the first sub organic layer 121. For this reason, the conductive part 170 is not directly connected to the second electrode 130. In this case, the first sub organic layer 121 is particularly preferably a coating film. By doing so, the embedding property of the first sub-organic layer 121 with respect to the unevenness is high, and the edge of the conductive part 170 can be covered and edge leakage can be suppressed.

The conductive part 170 can be formed after forming the first electrode 110 and before forming the first sub-organic layer 121. The conductive portion 170 is formed as follows, for example. First, a conductive layer to be the conductive portion 170 is formed using a film formation method such as a sputtering method. Next, a resist pattern (not shown) is formed on the conductive layer, and the conductive layer is etched (for example, wet etching) using the resist pattern as a mask. Thereby, the conductive part 170 is formed.

Note that the conductive portion 170 may be formed between the substrate 100 and the first electrode 110. In that case, the conductive portion 170 is formed on the first surface 101 of the substrate 100 before the first electrode 110 is formed.

In addition, since the light emitting device 10 includes the conductive portion 170, the wiring resistance of the first electrode 110 can be reduced.

(Modification 4 of the first embodiment)
FIG. 7 is a cross-sectional view illustrating a configuration of a light emitting device 10 according to Modification 4. FIG. 7 corresponds to FIG. 2 of the embodiment. The light emitting device 10 of this modification is the same as the light emitting device 10 according to the embodiment except that the insulating film 150 is provided.

In the light emitting device 10 of the present modification, at least a part of the insulating film 150 is located between the first electrode 110 and the organic layer 120. The edge of the first electrode 110 is covered with an insulating film 150. In other words, the insulating film 150 surrounds a portion of the first electrode 110 that becomes the light emitting unit 140 and defines the light emitting unit 140. In the example shown in this drawing, the edge in the width direction of the second electrode 130 is located on the insulating film 150. In other words, a part of the insulating film 150 protrudes from the second electrode 130 when viewed from a direction perpendicular to the substrate 100. In the example shown in the drawing, the first sub organic layer 121 is also formed on the insulating film 150 and on the side surface. The insulating film 150 is formed after the first electrode 110 is formed and before the organic layer 120 is formed.

The insulating film 150 preferably contains an inorganic material. Specifically, the insulating film 150 is preferably made of at least one of silicon oxide such as SiO ₂ , silicon nitride such as SiN _x , and silicon oxynitride such as SiON. When the insulating film 150 is made of a resin material, a gas generated by irradiating the resin material with ultraviolet rays or the like may damage the organic layer 120. On the other hand, when the insulating film 150 contains an inorganic material, the light emitting device 10 that is resistant to ultraviolet rays and excellent in weather resistance can be obtained. In this case, the insulating film 150 can be formed by a vacuum film formation method such as a sputtering method, a CVD method, an ALD method, or an EB vapor deposition method. Further, the insulating film 150 is formed in a predetermined pattern by using a mask.

However, the insulating film 150 may be formed of a photosensitive resin material such as polyimide. When the insulating film 150 is formed of a photosensitive resin, the insulating film 150 is formed in a predetermined pattern through an exposure and development process.

In this modification, since the edge of the first electrode 110 is covered with the insulating film 150, the edge leak between the first electrode 110 and the second electrode 130 can be prevented. On the other hand, since the first electrode 110 is further covered with the first sub organic layer 121, the thickness of the insulating film 150 can be reduced as compared with the case where it is not covered with the first sub organic layer 121. Therefore, high translucency can be ensured. Further, even when the insulating film 150 is formed including a resin material, the weather resistance can be improved.

As described above, also in this modification, the area of the first sub organic layer 121 is larger than the area of the second sub organic layer 122 in the light transmitting portion 104. Therefore, high light transmittance of the light emitting device 10 can be ensured. In addition, since the light emitting device 10 includes the insulating film 150, the leakage current between the first electrode 110 and the second electrode 130 can be further suppressed.

(Second Embodiment)
FIG. 8 is a cross-sectional view illustrating a configuration of the light emitting device 10 according to the second embodiment. Hereinafter, a description will be given focusing on differences from the light emitting device 10 according to the first embodiment.

In the light emitting device 10 according to the present embodiment, when viewed from a direction parallel to the thickness direction of the first electrode 110, at least a part of the edge of the first sub organic layer 121 is formed by the first electrode 110 and the second electrode 130. Does not overlap at least one. Further, the edge of the second sub organic layer 122 overlaps the second electrode 130 and the first electrode 110. However, when the light emitting device 10 is a lighting device, the light emitting unit 140 may be formed on almost the entire surface of the substrate 100. The stack position of the first sub organic layer 121 is not particularly limited, and the first sub organic layer 121 may be positioned between the second sub organic layer 122 and the second electrode 130.

In the example of this figure, the third sub organic layer 123 is located between the second sub organic layer 122 and the second electrode 130. The second sub organic layer 122 and the third sub organic layer 123 overlap the second electrode 130 and the first electrode 110 when viewed from the direction parallel to the thickness direction of the first electrode 110, and the second sub organic layer 122. In addition, at least one edge of the third sub organic layer 123 coincides with the edge of the light emitting unit 140. Note that at least part of the third sub organic layer 123 may protrude from the first electrode 110 and the second electrode 130. That is, at least a part of the edge of the third sub organic layer 123 does not overlap with at least one of the first electrode 110 and the second electrode 130 when viewed from the direction parallel to the thickness direction of the first electrode 110. good.

In the example of this figure, when viewed from the direction parallel to the thickness direction of the first electrode 110, at least part of the edge of the first sub-organic layer 121 overlaps both the first electrode 110 and the second electrode 130. Absent. Further, the edge of the second sub organic layer 122 overlaps the second electrode 130 and the first electrode 110. In addition, at least part of the edge of the first electrode 110 does not overlap the second electrode 130.

As described above, when viewed from the direction parallel to the thickness direction of the first electrode 110 (that is, the direction perpendicular to the substrate 100), at least part of the edge of the first sub-organic layer 121 includes the first electrode 110 and the first electrode 110. It does not overlap at least one of the two electrodes 130. Further, the edge of the second sub organic layer 122 overlaps the second electrode 130 and the first electrode 110. By doing so, the edge of the light emitting unit 140 is positioned inside the first electrode 110 and the second electrode 130, that is, the light-shielding electrode extends to the outside of the edge of the light emitting unit 140. Therefore, the light emitted from the light emitting unit 140 does not leak to the back surface side (side where the light shielding electrode is located) near the edge, but is reflected by the light shielding electrode and the front surface side (where the transparent electrode is located). Output efficiently).

In addition, since the first sub organic layer 121 is interposed between the first electrode 110 and the second electrode 130, a short circuit between the first electrode 110 and the second electrode 130 can be prevented. Specifically, at least the first sub organic layer 121 is located between the first electrode 110 and the second electrode 130 outside the light emitting unit 140. Further, another sub organic layer may be further positioned between the first electrode 110 and the second electrode 130. However, at least a part of the sub organic layer is not formed outside the light emitting unit 140. Therefore, on the outside of the light emitting unit 140, electrons injected from one of the first electrode 110 and the second electrode 130 and holes injected from the other of the first electrode 110 and the second electrode 130 are either sub The phenomenon of bonding within the organic layer is unlikely to occur. Therefore, a short circuit between the first electrode 110 and the second electrode 130 can be prevented. Further, it is not necessary to separately provide an insulating layer or the like in order to prevent a short circuit between the first electrode 110 and the second electrode 130.

As described above, in the present embodiment, when viewed from the direction parallel to the thickness direction of the first electrode 110, at least a part of the edge of the first sub organic layer 121 is at least one of the first electrode 110 and the second electrode 130. There is no overlap. Further, the edge of the second sub organic layer 122 overlaps the second electrode 130 and the first electrode 110. Therefore, backside leakage light near the edge of the light emitting unit 140 can be prevented, and light can be efficiently output to the front side. Further, it is not necessary to separately provide an insulating layer or the like in order to prevent a short circuit between the first electrode 110 and the second electrode 130.

(Modification 1 of 2nd Embodiment)
FIG. 9 is a cross-sectional view illustrating a configuration of the light emitting device 10 according to the first modification. The light emitting device 10 of this modification is the same as the light emitting device 10 according to the embodiment except that the width of the second electrode 130 is larger than the width of the first electrode 110.

In this modification, when viewed from a direction parallel to the thickness direction of the first electrode 110, at least a part of the edge of the first sub organic layer 121 does not overlap with either the first electrode 110 or the second electrode 130. . Further, the edge of the second sub organic layer 122 overlaps the second electrode 130 and the first electrode 110. In addition, at least a part of the edge of the second electrode 130 does not overlap the first electrode 110.

The first sub organic layer 121 preferably covers at least a part of the edge of the first electrode 110. Then, the edge of the first electrode 110 can be blunted by the first sub organic layer 121. Therefore, edge leakage can be suppressed even when at least one of the second electrode 130 and the sub-organic layer is stacked on the upper edge of the first electrode 110 as shown in FIG. Usually, for the purpose of suppressing edge leakage, an insulating film containing a resin material or the like is sometimes provided so as to cover the edge of the first electrode 110, but the gas generated by irradiating the resin material with ultraviolet rays or the like is generated in the organic layer. 120 may be damaged. On the other hand, in the light emitting device 10 of this modification, it is not necessary to separately provide such an insulating film, and the light emitting device 10 having excellent weather resistance can be obtained.

The first sub organic layer 121 is preferably a coating film containing a polymer. If it does so, the embedding property of an edge can be improved. In particular, the first sub organic layer 121 preferably includes a polymer having a weight average molecular weight larger than that of the second sub organic layer 122. The first sub organic layer 121 may include a compound having a weight average molecular weight of 3000 or more or a number average molecular weight of 500 or more.

In this modification, at least a part of the edge of the second electrode 130 may not overlap the first sub organic layer 121. That is, the second electrode 130 may cover the entire first sub organic layer 121 when viewed from a direction parallel to the thickness direction of the first electrode 110.

As described above, also in this modification, at least a part of the edge of the first sub organic layer 121 is at least one of the first electrode 110 and the second electrode 130 when viewed from the direction parallel to the thickness direction of the first electrode 110. Does not overlap. Further, the edge of the second sub organic layer 122 overlaps the second electrode 130 and the first electrode 110. Therefore, backside leakage light near the edge of the light emitting unit 140 can be prevented, and light can be efficiently output to the front side. Further, it is not necessary to separately provide an insulating layer or the like in order to prevent a short circuit between the first electrode 110 and the second electrode 130.

(Modification 2 of the second embodiment)
FIG. 10 is a cross-sectional view illustrating a configuration of the light emitting device 10 according to the second modification. The light emitting device 10 of the present modification is the same as the light emitting device 10 according to the embodiment except that the width of the first sub organic layer 121 is smaller than the width of the first electrode 110.

In this modification, at least a part of the edge of the first sub-organic layer 121 does not overlap the second electrode 130 when viewed from the direction parallel to the thickness direction of the first electrode 110. Further, the edge of the second sub organic layer 122 overlaps the second electrode 130 and the first electrode 110. In addition, at least part of the edge of the first electrode 110 does not overlap the second electrode 130.

(Modification 3 of the second embodiment)
FIG. 11 is a cross-sectional view illustrating a configuration of a light emitting device 10 according to Modification 3. The light emitting device 10 of the present modification is the same as the light emitting device 10 according to the embodiment except that the conductive portion 170 is provided.

The conductive part 170 is, for example, an auxiliary electrode of the first electrode 110 and is in contact with the first electrode 110. The conductive portion 170 is formed of a material having a lower resistance value than that of the first electrode 110, and is formed using, for example, at least one metal layer. The conductive portion 170 has a configuration in which, for example, a first metal layer such as Mo or Mo alloy, a second metal layer such as Al or Al alloy, and a third metal layer such as Mo or Mo alloy are stacked in this order. Yes. Of these three metal layers, the second metal layer is the thickest.

The conductive part 170 is covered with the first sub organic layer 121. For this reason, the conductive part 170 is not directly connected to the second electrode 130. In this case, the first sub organic layer 121 is preferably a coating film. By doing so, the embedding property of the first sub organic layer 121 with respect to the unevenness is high, and the edge of the conductive portion 170 can be covered and edge leakage can be suppressed.

The timing for forming the conductive portion 170 is after the first electrode 110 is formed and before the first sub-organic layer 121 is formed. The conductive portion 170 is formed as follows, for example. First, a conductive layer to be the conductive portion 170 is formed using a film formation method such as a sputtering method. Next, a resist pattern (not shown) is formed on the conductive layer, and the conductive layer is etched (for example, wet etching) using the resist pattern as a mask. Thereby, the conductive part 170 is formed.

Note that the conductive portion 170 may be formed between the substrate 100 and the first electrode 110.

(Modification 4 of the second embodiment)
FIG. 12 is a cross-sectional view illustrating a configuration of a light emitting device 10 according to Modification 4. The light emitting device 10 of the present modification is the same as the light emitting device 10 according to the embodiment except for the points described below.

In this modification, the organic layer 120 of the light emitting unit 140 has a configuration in which a first sub organic layer 121, a second sub organic layer 122, and a third sub organic layer 123 are stacked in this order from the second electrode 130 side. Yes. In the light emitting unit 140, for example, the first sub organic layer 121 functions as an electron injection layer, the second sub organic layer 122 functions as a light emitting layer, and the third sub organic layer 123 functions as a hole injection layer. A sub organic layer functioning as an electron transport layer may be further formed between the first sub organic layer 121 and the second sub organic layer 122. Further, a sub organic layer functioning as a hole transport layer may be further formed between the second sub organic layer 122 and the third sub organic layer 123. The organic layer 120 may be formed by a vapor deposition method. In addition, at least one sub organic layer of the organic layer 120, for example, the first sub organic layer 121 may be formed by a coating method such as an inkjet method, a printing method, a spin coating method, or a spray method. In this case, the remaining layers of the organic layer 120 may be formed by a vapor deposition method. Moreover, all the layers of the organic layer 120 may be formed using the apply | coating method.

A method for manufacturing the light emitting device 10 of the present modification will be described. First, the first electrode 110 is formed on the substrate 100 by using, for example, a sputtering method. Next, the first electrode 110 is formed into a predetermined pattern using a photolithography method. Next, the third sub organic layer 123 and the second sub organic layer 122 are formed in this order. The second sub organic layer 122 and the third sub organic layer 123 can be formed by, for example, a vapor deposition method. These layers are formed in a predetermined pattern using, for example, a mask. Next, the first sub organic layer 121 is formed by, for example, a coating method. Then, the second electrode 130 is formed. The second electrode 130 is also formed in a predetermined pattern using, for example, a mask. Thereafter, the light emitting unit 140 is sealed using a sealing film or a sealing member (not shown).

(Modification 5 of the second embodiment)
FIG. 13 is a cross-sectional view illustrating a configuration of a light emitting device 10 according to Modification 5. The light emitting device 10 of the present modification is the same as the light emitting device 10 according to the embodiment except for the points described below.

In this modification, the organic layer 120 includes a third sub-organic layer 123. When viewed from a direction parallel to the thickness direction of the first electrode 110, at least a part of the edge of the first electrode 110 and at least a part of the edge of the second electrode 130 overlap with the third sub organic layer 123. Yes. Further, the third sub organic layer 123 functions as a hole blocking layer or an electron blocking layer in the light emitting unit 140. By doing so, the leakage current between the first electrode 110 and the second electrode 130 can be further suppressed outside the light emitting unit 140.

In the example of the figure, the organic layer 120 of the light emitting unit 140 includes a first sub organic layer 121, a fourth sub organic layer 124, a second sub organic layer 122, a third sub organic layer 123, and a fifth sub organic layer 125. The first electrode 110 side is laminated in this order. For example, the first sub organic layer 121 is a hole injection layer, the fourth sub organic layer 124 is an electron blocking layer, the second sub organic layer 122 is a light emitting layer, the third sub organic layer 123 is a hole blocking layer, and a fifth sub organic layer. The layer 125 is a layer that functions as an electron injection layer. In the present modification, in addition to the first sub organic layer 121, the third sub organic layer 123 is located between the second electrode 130 and the first electrode 110 in the region outside the light emitting unit 140. Therefore, even if holes are injected from the first electrode 110 into the first sub organic layer 121, the holes are blocked by the third sub organic layer 123 and do not reach the second electrode 130. Therefore, leakage current can be suppressed.

Note that a fourth sub-organic layer 124 may be positioned between the second electrode 130 and the first electrode 110 in a region outside the light emitting unit 140. That is, when viewed from the direction parallel to the thickness direction of the first electrode 110, at least a part of the edge of the first electrode 110 and at least a part of the edge of the second electrode 130 overlap the fourth sub organic layer 124. May be. By doing so, the progress of electrons to the first sub organic layer 121 is suppressed, and the leakage current can be further suppressed.

(Modification 6 of the second embodiment)
FIG. 14 is a cross-sectional view of the light emitting device 10 according to Modification 6. FIG. 15 is a plan view of the light emitting device 10 shown in FIG. FIG. 14 corresponds to the AA cross section of FIG. The light-emitting device 10 according to this modification has the same configuration as that of at least one of the light-emitting devices 10 according to the second embodiment or modifications 1 to 5 thereof, except that a plurality of light-emitting units 140 are provided. .

Specifically, the light emitting device 10 is a lighting device, and includes a plurality of light emitting units 140 on the first surface side of the substrate 100. The plurality of light emitting units 140 are each linear, and are disposed on the first surface of the substrate 100 so as to be separated from each other. Specifically, the plurality of light emitting units 140 are linear and extend in the same direction. In addition, the light emitting device 10 includes a light transmitting portion between the plurality of light emitting portions 140.

When viewed from a direction perpendicular to the substrate 100, the light emitting device 10 includes a first region 102 and a second region 104 (translucent portion). The first region 102 is a region overlapping with the second electrode 130. When the second electrode 130 has a light shielding property, the first region 102 is a region that does not transmit light. The second region 104 is a region that does not overlap with the second electrode 130. Since the light transmittance of the second electrode 130 is lower than the light transmittance of the first electrode 110, the light transmittance of the second region 104 is higher than the light transmittance of the first region 102. The area of the first region 102 may be smaller than the area of the second region 104. Further, the area of the substrate 100 where the light emitting part 140 is formed (in other words, the area of the light emitting part) is the area of the substrate 100 where the light emitting part 140 is not formed (in other words, the area of the non-light emitting part). ).

The first sub organic layer 121 is also formed in a region located between the light emitting units 140 on the first surface of the substrate 100. In other words, the first sub organic layer 121 is continuously formed in the plurality of light emitting units 140 and a region between them.

Note that at least a part of the edge of the first sub-organic layer 121 may be located between the plurality of light emitting units 140. By doing so, the first sub organic layer 121 is not positioned in at least a part of the second region 104, and the translucency of the second region 104 can be improved.

In a light emitting device using an organic layer, an edge of the first electrode may be covered with an insulating layer in order to suppress a short circuit between the first electrode and the second electrode. In such a case, part of the light is absorbed when passing through the insulating layer. In this case, the light transmittance of the light emitting device is lowered. On the other hand, in the light emitting device 10 of the present modification, such an insulating layer is not formed, and the light transmittance is not impaired. Further, in the organic layer 120, only a part of the sub-organic layers are located in the second region 104 at most, so that higher light transmittance can be obtained as compared with the case where all of the organic layers 120 are located.

In the light emitting device 10 of this modification, in the cross section perpendicular to the extending direction of the light emitting unit 140 and perpendicular to the substrate 100, the width of the second sub organic layer 122 of each light emitting unit 140 is equal to the width of the first electrode 110 and the second. It is smaller than any width of the electrode 130. In this cross section, the width of the first sub organic layer 121 of each light emitting unit 140 is larger than at least one of the width of the first electrode 110 and the width of the second electrode 130.

(Third embodiment)
FIG. 16 is a cross-sectional view illustrating a configuration of the light emitting device 10 according to the third embodiment. FIG. 17 is an enlarged view of the light emitting unit 140. Hereinafter, a description will be given focusing on differences from the light emitting device 10 according to the first embodiment.

In the light emitting device 10 according to the present embodiment, the light emitting unit 140 is located on the first surface 101 side of the substrate 100. The coating film 180 covers the light emitting unit 140 and is formed after the second electrode 130 is formed. The light emitting unit 140 includes the first electrode 110, the second electrode 130, and the organic layer 120. The organic layer 120 of the light emitting unit 140 is located between the first electrode 110 and the second electrode 130 and includes the first sub organic layer 121 and the second sub organic layer 122. The covering film 180 is in contact with the first sub organic layer 121 in a region where the second sub organic layer 122 is not located when viewed from the direction perpendicular to the substrate 100 in the light transmitting portion 104. Further, the second sub organic layer 122 is not formed in at least a part of the light transmitting portion 104.

The coating film 180 covers the light emitting unit 140. Specifically, the coating film 180 covers all of the plurality of light emitting units 140. The covering film 180 is, for example, a sealing film. As the covering film 180, for example, an inorganic barrier film such as SiN _x , SiON _x , SiO ₂ , Al ₂ O ₃ , TiO ₂ , a barrier laminated film including them, or a mixed film thereof can be used. These can be formed by, for example, a vacuum film forming method such as a sputtering method, a CVD method, an ALD method, or an EB vapor deposition method. The coating film 180 has translucency and is continuously formed over the light emitting unit 140 and the translucent unit 104.

The minimum film thickness d ₄ of the organic layer 120 in the light transmitting part 104 can be made smaller than the film thickness d ₃ of the organic layer 120 in the light emitting part 140. Incidentally, in the case the thickness of the organic layer 120 in the light emitting portion 140 is not constant, the minimum thickness _{d 4} of the organic layer 120 in the transparent portion 104, a thickness _{d 3} is less than the organic layer 120 in the light emitting portion 140 It means that it is smaller than the average film thickness of the organic layer 120 in the light emitting part 140.

As described above, the coating film 180 is in contact with the first sub-organic layer 121 in the region where the second sub-organic layer 122 is not located in the translucent part 104 when viewed from the direction perpendicular to the substrate 100. That is, the coating film 180 in contact with the thin portion of the organic layer 120 in the light transmitting portion 104. Here, since the propagation of stress is suppressed in the thin organic layer 120, the coating film 180 is not easily peeled off or cracked in the light transmitting portion 104. As described above, by reducing the area of the second sub organic layer 122 in the light transmitting portion 104, it is possible to improve the adhesion of the coating film 180 and to increase the light transmittance. Moreover, the average film thickness of the organic layer 120 in the translucent part 104 can be made smaller, and the peeling of the coating film 180 and the occurrence of cracks can be further suppressed.

The first sub organic layer 121 is preferably a coating film. Furthermore, the first sub organic layer 121 preferably includes a polymer. Specifically, for example, the first sub organic layer 121 includes a polymer having a weight average molecular weight larger than that of the second sub organic layer 122. The first sub organic layer 121 may include a compound having a weight average molecular weight of 3000 or more or a number average molecular weight of 500 or more. In particular, when the first sub organic layer 121 functions as a hole injection layer, the first sub organic layer 121 preferably includes an aromatic amine compound such as an aromatic tertiary amine polymer compound.

When the first sub-organic layer 121 contains a polymer, the adhesion and intermolecular bonding force are improved in the heat-crosslinking during the film formation. And the elasticity of the first sub-organic layer 121 can be increased. Accordingly, it is possible to further prevent the coating film 180 from peeling off or cracking due to local stress concentration due to thermal expansion difference or film stress.

As described above, according to the present embodiment, the coating film 180 is in contact with the first sub organic layer 121 in a region where the second sub organic layer 122 is not located when viewed from the direction perpendicular to the substrate 100 in the light transmitting portion 104. ing. That is, the coating film 180 in contact with the thin portion of the organic layer 120 in the light transmitting portion 104. Therefore, peeling or cracking of the coating film 180 in the light transmitting portion 104 is difficult to occur.

Further, when viewed from the direction perpendicular to the substrate 100, at least a part of the edge of the first electrode 110 does not overlap with the second sub organic layer 122. That is, the width of the second sub organic layer 122 in a cross section perpendicular to the extending direction of the light emitting unit 140 and perpendicular to the substrate 100 (corresponding to FIGS. 16 and 17) is smaller than the width of the first electrode 110. By doing so, the average film thickness of the organic layer 120 in the translucent portion 104 can be further reduced, and peeling of the coating film 180 and generation of cracks can be further suppressed.

(Modification 1 of 3rd Embodiment)
FIG. 18 is a cross-sectional view illustrating a configuration of the light emitting device 10 according to the first modification. FIG. 18 corresponds to FIG. 17 of the embodiment. The light emitting device 10 of the present modification is the same as the light emitting device 10 according to the embodiment except that at least a part of the edge of the second sub organic layer 122 does not overlap with either the first electrode 110 or the second electrode 130. It is. In other words, the light emitting device 10 according to this modification has a configuration in which the coating film 180 is added to Modification 1 of the first embodiment.

Also in the present modification, the coating film 180 is in contact with the first sub organic layer 121 in a region where the second sub organic layer 122 is not located in the light transmitting portion 104 when viewed from the direction perpendicular to the substrate 100. That is, the coating film 180 in contact with the thin portion of the organic layer 120 in the light transmitting portion 104. Therefore, peeling or cracking of the coating film 180 in the light transmitting portion 104 is difficult to occur.

In addition, according to this modification, at least a part of the edge of the second sub organic layer 122 does not overlap with either the first electrode 110 or the second electrode 130. Therefore, the leakage current between the first electrode 110 and the second electrode 130 can be further suppressed.

(Modification 2 of the third embodiment)
FIG. 19 is a cross-sectional view illustrating a configuration of the light emitting device 10 according to the second modification. FIG. 19 corresponds to FIG. 17 of the embodiment. The light emitting device 10 according to the present modification is the same as the light emitting device 10 according to the embodiment except that the second sub organic layer 122 is located between the first sub organic layer 121 and the substrate 100. In other words, the light emitting device 10 according to this modification has a configuration in which the coating film 180 is added to Modification 2 of the first embodiment.

(Modification 3 of the third embodiment)
FIG. 20 is a cross-sectional view illustrating a configuration of a light emitting device 10 according to Modification 3. FIG. 20 corresponds to FIG. 17 of the embodiment. The light emitting device 10 of the present modification is the same as the light emitting device 10 according to the embodiment except that the conductive portion 170 is provided. In other words, the light emitting device 10 according to this modification has a configuration in which the coating film 180 is added to the modification 3 of the first embodiment.

(Modification 4 of the third embodiment)
FIG. 21 is a cross-sectional view illustrating a configuration of a light emitting device 10 according to Modification 4. FIG. 21 corresponds to FIG. 17 of the embodiment. The light emitting device 10 of this modification is the same as the light emitting device 10 according to the embodiment except that the insulating film 150 is provided. In other words, the light-emitting device 10 according to this modification has a configuration in which the coating film 180 is added to Modification 4 of the first embodiment.

(Example)
FIG. 22 is a cross-sectional view illustrating a configuration of the light-emitting device 10 according to the example. FIG. 23 is a plan view of the light-emitting device 10 shown in FIG. However, in FIG. 23, the coating film 180 is indicated by a broken line. FIG. 24 is a view obtained by removing the first sub organic layer 121, the second sub organic layer 122, and the third sub organic layer 123 from FIG. In FIG. 24, the second electrode 130 is indicated by a broken line. FIG. 22 corresponds to the BB cross section of FIG. The light-emitting device 10 according to the present example has the configuration of the light-emitting device 10 according to any of the above-described embodiments and modifications. This figure shows a case similar to that of the third embodiment.

The light emitting device 10 includes a first terminal 112, a first lead wire 114, and a second terminal 132. The first terminal 112, the first lead wire 114, and the second terminal 132 are all formed on the same surface of the substrate 100 as the light emitting unit 140. At least a part of the first terminal 112 and the second terminal 132 is located outside the coating film 180, that is, not covered with the coating film 180. The first lead wiring 114 connects the first terminal 112 and the first electrode 110, and the second terminal 132 is connected to the second electrode 130.

In the example of this figure, the substrate 100 is rectangular, and the first terminal 112 is located between the plurality of light emitting units 140 and the first side 106 of the substrate 100 and extends in parallel with the first side 106. ing. The second terminal 132 is located between the plurality of light emitting units 140 and the second side 107 of the substrate 100, and extends in parallel with the second side 107. The second side 107 and the first side 106 are parallel to each other, and both are sides that are perpendicular to the extending direction of the linear light emitting unit 140.

The first terminal 112 is provided with a recess 113. In the example of this figure, the first terminal 112 is provided with a plurality of recesses 113 along the extending direction of the first terminal 112. When the first sub organic layer 121 is a coating film formed by a coating method, the spread of the liquid material for forming the first sub organic layer 121 is stopped by the surface tension in the vicinity of the recess 113. That is, the first sub organic layer 121 is mainly formed inside the substrate 100 with respect to the pattern of the recess 113. Therefore, a separate patterning process for preventing the entire first terminal 112 from being covered with the first sub organic layer 121 is not necessary.

Furthermore, the light emitting device 10 includes a bank 115 between the plurality of light emitting units 140 and the second terminal 132. When the first sub organic layer 121 is a coating film formed by a coating method, the spread of the liquid material for forming the first sub organic layer 121 is stopped by the surface tension in the vicinity of the bank 115. That is, the first sub organic layer 121 is formed inside the substrate 100 with respect to the bank 115. Therefore, a separate patterning process for preventing the entire second terminal 132 from being covered with the first sub organic layer 121 is not necessary. In particular, by suppressing the wetting and spreading of the liquid material to the contact portion between the second electrode 130 and the second terminal 132, the possibility of wiring failure can be reduced. In the example of this figure, the first sub organic layer 121 overlaps a part of the first terminal 112 and does not overlap the second terminal 132 when viewed from the direction perpendicular to the substrate 100.

In the example shown in FIGS. 22 to 24, at least a part of the bank 115 extends along the second terminal 132. Specifically, the bank 115 is located between the plurality of light emitting units 140 and the second terminals 132 and between the plurality of light transmitting units 104 and the second terminals 132. When viewed from the direction perpendicular to the substrate 100, the second electrode 130 and the bank 115 intersect. A plurality of banks 115 parallel to each other may be positioned between the plurality of light emitting units 140 and the second terminals 132 and between the plurality of light transmitting units 104 and the second terminals 132.

In the example shown in FIGS. 22 to 24, the bank 115 and the second electrode 130 are in contact with each other and are electrically connected. On the other hand, since the first sub organic layer 121 is interposed between the bank 115 and the first electrode 110, the bank 115 and the first electrode 110 are not electrically connected.

The bank 115 is also located between the plurality of light emitting units 140 and the third side 108 of the substrate 100 and between the plurality of light emitting units 140 and the fourth side 109 of the substrate 100. Here, the third side 108 and the fourth side 109 of the substrate 100 are parallel to the extending direction of the light emitting unit 140. Specifically, the bank 115 includes a light emitting unit 140 between the light emitting unit 140 closest to the third side 108 and the third side 108 and a light emitting unit 140 closest to the fourth side 109 among the plurality of light emitting units 140. It is located between the fourth side 109. By doing so, it is possible to prevent the liquid material for forming the first sub organic layer 121 from spreading to the outside of the substrate 100 in the film forming process of the first sub organic layer 121.

The first terminal 112, the second terminal 132, the first lead wiring 114, and the bank 115 have, for example, a layer formed of the same material as the first electrode 110. Further, at least a part of at least one of the first terminal 112, the second terminal 132, the first lead-out wiring 114, and the bank 115 is formed on this layer with a metal film having a lower resistance than the first electrode 110 (for example, a conductive film). The same film as the portion 170 may be included. This metal film does not need to be formed on all of the first terminal 112, the second terminal 132, the first extraction wiring 114, and the bank 115. Of the first terminal 112, the first lead wiring 114, the second terminal 132, and the bank 115, a layer formed of the same material as the first electrode 110 is formed in the same process as the first electrode 110. For this reason, the first electrode 110 is integrated with at least a part of the layer of the first terminal 112. Further, when these have a metal film, the metal film is formed in the same process as that of the conductive portion 170 described above, for example.

In the example shown in the figure, one first extraction wiring 114 is formed for each light emitting unit 140 one by one. The plurality of first lead wires 114 are all connected to the same first terminal 112. The second electrodes 130 of the plurality of light emitting units 140 are electrically connected to the second terminal 132 across the bank 115. When viewed from a direction perpendicular to the substrate 100, the bank 115 intersects the second electrode 130. The first terminal 112 is connected to a positive terminal of a control circuit via a conductive member such as a bonding wire or a lead terminal, and the second terminal 132 is controlled via a conductive member such as a bonding wire or a lead terminal. The negative terminal of the circuit is connected.

In the present embodiment, the first sub organic layer 121 is in contact with the coating film 180 in at least a part of the region. Here, in the case where the first sub organic layer 121 includes a polymer, the adhesion and intermolecular bonding force are improved in the heat crosslinking at the time of film formation, so that compared with the case where the first sub organic layer 121 is made of a low molecule. Therefore, the bond between molecules is strong and the elasticity of the first sub-organic layer 121 can be increased. Accordingly, it is possible to make it difficult for the coating film 180 to be peeled off or cracked due to local stress concentration due to thermal expansion difference or film stress.

In addition, the number of sub-organic layers included in the organic layer 120 in at least a part of the light transmitting portion 104 is greater than the number of sub-organic layers included in the organic layer 120 in the first region 102 (light emitting portion 140). There are few. That is, the average thickness of the organic layer 120 in the light transmitting part 104 is smaller than the thickness of the organic layer 120 in the light emitting part 140. Therefore, the propagation of stress in the organic layer 120 is suppressed, and peeling or cracking of the coating film 180 in the light transmitting portion 104 is unlikely to occur.

FIG. 25 is a diagram illustrating a first modification of the light emitting device 10 according to the embodiment. FIG. 25 corresponds to FIG. 24 of the embodiment. In the example of FIG. 25, at least a part of the bank 115 is formed along the second terminal 132. Specifically, the bank 115 is located between the light transmitting portion 104 between the light emitting portions 140 and the second terminal 132. On the other hand, the bank 115 is not formed between the light emitting unit 140 and the second terminal 132. That is, the bank 115 does not overlap the second electrode 130 when viewed from the direction perpendicular to the substrate 100. The bank 115 is not electrically connected to either the first terminal 112 or the second terminal 132. Also in this modification, the liquid material for forming the first sub-organic layer 121 has surface tension with the bank 115, and the wetting and spreading of the liquid material in the vicinity of the bank 115 is suppressed. Therefore, the second terminal 132 can be prevented from being covered with the first sub organic layer 121.

FIG. 26 is a diagram illustrating a second modification of the light emitting device 10 according to the embodiment. FIG. 26 corresponds to FIG. 24 of the embodiment. In the example of this figure, the bank 115 is not formed between the light emitting unit 140 and the second terminal 132 and between the light transmitting unit 104 and the second terminal 132 between the light emitting unit 140. In the example of this figure, the end of each bank 115 extending along the third side 108 and the fourth side 109 is connected to the second terminal 132. Note that the end of each bank 115 extending along the third side 108 and the fourth side 109 may be connected to the first terminal 112 instead of being connected to the second terminal 132. The bank 115 may not be connected to either the first terminal 112 or the second terminal 132. Also in this modification, wetting and spreading of the liquid material for forming the first sub organic layer 121 is suppressed in the vicinity of the edge of the second terminal 132. Therefore, the second terminal 132 can be prevented from being covered with the first sub organic layer 121. Further, the light transmittance is improved as compared with the configuration shown in FIGS.

FIG. 27 is a diagram illustrating a third modification of the light emitting device 10 according to the embodiment. FIG. 27 corresponds to FIG. 24 of the embodiment. In the example of FIG. 27, at least a part of the bank 115 is formed along the second terminal 132. Specifically, the bank 115 is located between the light emitting unit 140 and the second terminal 132. On the other hand, the bank 115 is not formed at least at a part between the light transmitting portion 104 and the second terminal 132. When viewed from a direction perpendicular to the substrate 100, the bank 115 intersects the second electrode 130. The bank 115 and the second electrode 130 are in contact with each other and are electrically connected. On the other hand, the bank 115 and the first electrode 110 are not electrically connected. Also in this modification, wetting and spreading of the liquid material for forming the first sub organic layer 121 is suppressed by the bank 115. Therefore, the second terminal 132 can be prevented from being covered with the first sub organic layer 121. Further, the light transmittance is improved as compared with the configuration shown in FIGS.

As described above, also in this example, in the case of having the structure of the first embodiment or the modification thereof, the area of the first sub organic layer 121 is larger than the area of the second sub organic layer 122 in the light transmitting portion 104. Is also big. Therefore, high light transmittance of the light emitting device 10 can be ensured. In addition, leakage current between the first electrode 110 and the second electrode 130 can be suppressed.

Further, in the case of having the structure of the second embodiment or the modification thereof, at least a part of the edge of the first sub organic layer 121 is viewed from a direction parallel to the thickness direction of the first electrode 110. It does not overlap with at least one of the first electrode 110 and the second electrode 130. Further, the edge of the second sub organic layer 122 overlaps the second electrode 130 and the first electrode 110. Therefore, backside leakage light near the edge of the light emitting unit 140 can be prevented, and light can be efficiently output to the front side. Further, it is not necessary to separately provide an insulating layer or the like in order to prevent a short circuit between the first electrode 110 and the second electrode 130.

Further, in the case of having the structure of the third embodiment or a modification thereof, the light transmitting portion 104 is covered with a region where the second sub organic layer 122 is not located when viewed from the direction perpendicular to the substrate 100. The film 180 is in contact with the first sub organic layer 121. That is, the coating film 180 in contact with the thin portion of the organic layer 120 in the light transmitting portion 104. Therefore, peeling or cracking of the coating film 180 in the light transmitting portion 104 is difficult to occur.

As mentioned above, although embodiment and the Example were described with reference to drawings, these are the illustrations of this invention, Various structures other than the above are also employable.

According to the second embodiment, the following invention is disclosed.
(Appendix 1)
A light emitting unit including a first electrode, a second electrode, and an organic layer located between the first electrode and the second electrode;
The organic layer includes a first sub organic layer and a second sub organic layer,
When viewed from a direction parallel to the thickness direction of the first electrode, at least a part of the edge of the first sub-organic layer does not overlap at least one of the first electrode and the second electrode, The edge of 2 sub organic layers is a light-emitting device with which the said 2nd electrode and the said 1st electrode have overlapped.
(Appendix 2)
In the light emitting device according to attachment 1,
The first electrode has translucency,
The first sub organic layer is a light emitting device positioned between the second sub organic layer and the first electrode.
(Appendix 3)
In the light-emitting device according to appendix 1 or 2,
The light emitting device, wherein the first sub organic layer covers at least a part of an edge of the first electrode.
(Appendix 4)
In the light-emitting device according to any one of appendices 1 to 3,
The first sub organic layer is a light emitting device that functions as a hole injection layer in the light emitting unit.
(Appendix 5)
In the light-emitting device according to any one of appendices 1 to 4,
The organic layer further includes a third sub-organic layer,
When viewed from a direction parallel to the thickness direction of the first electrode, at least a part of the edge of the first electrode and at least a part of the edge of the second electrode overlap the third sub-organic layer,
The third sub-organic layer is a light emitting device that functions as a hole blocking layer or an electron blocking layer in the light emitting unit.
(Appendix 6)
In the light-emitting device according to any one of appendices 1 to 5,
Further comprising a substrate facing the second electrode via the first electrode;
The second electrode is a light emitting device having a light shielding property.
(Appendix 7)
In the light emitting device according to appendix 6,
A light emitting device comprising a plurality of the light emitting units on the first surface side of the substrate.
(Appendix 8)
In the light emitting device according to appendix 7,

Further, according to the third embodiment, the following invention is disclosed.
(Appendix 11)
A plurality of light emitting units located on the first surface side of the substrate;
A translucent part located between the plurality of light emitting parts;
A coating film covering the light emitting part,
The light emitting unit includes a first electrode, a second electrode, and an organic layer located between the first electrode and the second electrode and including a first sub organic layer and a second sub organic layer. ,
The light emitting device, wherein the coating film is in contact with the first sub organic layer in a region where the second sub organic layer is not positioned when viewed from a direction perpendicular to the substrate in the light transmitting portion.
(Appendix 12)
In the light emitting device according to attachment 11,
A light emitting device in which at least a part of an edge of the first electrode does not overlap the second sub organic layer when viewed from a direction perpendicular to the substrate.
(Appendix 13)
In the light emitting device according to appendix 11 or 12,
The light emitting device, wherein the first sub organic layer is a coating film.
(Appendix 14)
In the light-emitting device according to any one of appendices 11 to 13,
The first sub organic layer is a light emitting device including a polymer having a weight average molecular weight larger than that of the second sub organic layer.
(Appendix 15)
In the light-emitting device according to any one of appendices 11 to 14,
The first sub-organic layer is a light emitting device including an aromatic amine compound.
(Appendix 16)
In the light-emitting device according to any one of appendices 11 to 15,
The light emitting device in which the minimum film thickness of the organic layer in the light transmitting part is smaller than the film thickness of the organic layer in the light emitting part.
(Appendix 17)
In the light-emitting device according to any one of appendices 11 to 16,
The first electrode has translucency,
The second electrode has a light shielding property;
The first electrode is a light emitting device positioned between the substrate and the second electrode.

This application claims priority based on Japanese Patent Application No. 2016-1554079, Japanese Application No. 2016-154080, and Japanese Application No. 2016-154081 filed on Aug. 4, 2016. , The entire disclosure of which is incorporated herein.

Claims

A plurality of light emitting units;
A translucent part located between the plurality of light emitting parts,
Each of the plurality of light emitting units includes an organic layer including a first sub organic layer and a second sub organic layer,
In the light emitting unit, the first sub-organic layer and the second sub-organic layer overlap each other,
In the light transmissive part, the area of the first sub organic layer is larger than the area of the second sub organic layer.
The light-emitting device according to claim 1.
Each of the plurality of light emitting units includes a stacked structure of a first electrode and a second electrode,
At least a part of the first sub-organic layer and at least a part of the second sub-organic layer are light emitting devices positioned between the first electrode and the second electrode.
The light-emitting device according to claim 2.
The first electrode has optical transparency,
The first sub organic layer is a light emitting device in contact with the first electrode.
The light-emitting device according to claim 2 or 3,
The light emitting device, wherein the first sub organic layer covers at least a part of an edge of the first electrode.
The light emitting device according to any one of claims 2 to 4,
A light emitting device in which at least a part of the edge of the second sub organic layer does not overlap the second electrode when viewed from a direction parallel to the thickness direction of the first electrode.
The light emitting device according to any one of claims 2 to 5,
A light emitting device in which at least a part of the edge of the first electrode does not overlap the second sub organic layer when viewed from a direction parallel to the thickness direction of the first electrode.
The light emitting device according to any one of claims 2 to 6,
A light emitting device further comprising an insulating film covering an edge of the first electrode.
The light-emitting device according to claim 7.
The insulating film is a light emitting device including an inorganic material.
The light emitting device according to any one of claims 1 to 8,
The first sub organic layer is a light emitting device that functions as a hole injection layer in the light emitting unit.
The light emitting device according to any one of claims 1 to 9,
The thickness of the first sub organic layer is a light emitting device thinner than the thickness of the second sub organic layer.
The light-emitting device according to claim 10.
The second sub organic layer is a light emitting device that functions as a light emitting layer in the light emitting unit.
The light emitting device according to any one of claims 1 to 11,
The light emitting device, wherein the first sub organic layer is a coating film.
The light emitting device according to any one of claims 1 to 12,
The first sub organic layer is a light emitting device including a polymer having a weight average molecular weight larger than that of the second sub organic layer.