JP5396036B2 - Organic EL device - Google Patents

Description

  The present invention relates to an organic EL (electroluminescence) element having an organic light emitting layer sandwiched between a pair of electrodes having different electric resistances.

  Conventionally, an organic EL element having an organic light emitting layer is known. In addition, since the organic EL element is used for illumination or the like, the plane area of the organic EL element tends to increase. In such a case, the organic EL element has a problem in that luminance spots are generated in the plane of the light emitting surface. Therefore, a technique for reducing such unevenness in luminance of the organic EL element has been proposed.

  Patent Document 1 discloses an organic EL lighting device including a substrate, an anode formed on the substrate, an organic light emitting layer, and a cathode. In this organic EL lighting device, the anode is formed by a plurality of strip-shaped transparent electrodes. And the wiring from the outside connected to the edge part of an anode is connected to the edge part on a different side alternately.

Patent Document 2 discloses an organic EL element unit in which a plurality of organic EL elements are formed on a single substrate. In this organic EL element unit, a gap is formed between adjacent organic EL elements so that the anode and the cathode of the adjacent organic EL elements are not electrically connected.
JP 2007-173519 A JP 2007-173564 A

  However, in the organic EL lighting device disclosed in Patent Document 1, light is not emitted because holes are not injected in a region where the anode is not formed. For this reason, in the organic EL lighting device of Patent Document 1, there is a problem that luminance unevenness increases between a region where the strip-shaped anode is formed and a region where the anode is not formed. Further, in the organic EL lighting device of Patent Document 1, the anode is formed of a transparent electrode having a large resistance. For this reason, even in the region where the strip-shaped anode is formed, the holes do not easily reach the end on the side where the external wiring is not connected, and the luminance is reduced. This also has a problem that the luminance spots become large.

  Moreover, in the organic EL element unit of Patent Document 2, light does not emit between the organic EL elements. For this reason, in the organic EL element unit of Patent Document 2, there is a problem that luminance unevenness is large between a region where the organic EL element is formed and a region where the organic EL element is not formed.

  The present invention has been made in order to solve the above-described problems, and an object thereof is to provide an organic EL element capable of reducing luminance unevenness.

In order to achieve the above object, the invention according to claim 1 includes a substrate, a planar first electrode, a planar second electrode having a smaller electrical resistance than the first electrode, and the first electrode. An organic light emitting layer formed between the first electrode and the second electrode, a light emitting unit formed on the substrate, a first external terminal formed on the substrate and connected to the first electrode, A second external terminal formed on the substrate and connected to the second electrode;
The surface of the first external terminal connected to the outside is a first connection surface, the surface of the second external terminal connected to the outside is a second connection surface, and is larger than the area of the second connection surface. the first rather the size towards the area of the connection surface, the substrate is a polygonal shape, the first external terminal is formed along the sides of the polygonal board, the second external terminal The organic EL element is formed at the apex of the polygonal substrate .

The invention according to claim 2, wherein the first external terminal and the second external terminal, to claim 1, characterized in that with respect to the straight line passing through the center or the center of the organic light emitting layer is a symmetrical It is an organic EL element of description .

The invention according to claim 3 is characterized in that the first electrode is formed on the substrate, and the first electrode and the first external terminal are integrally formed of the same material. The organic EL device according to claim 1 or 2 .

Moreover, invention of Claim 4 WHEREIN: The said 1st external terminal and the said 2nd external terminal are formed with the same material, The any one of Claims 1-3 characterized by the above-mentioned. It is an organic EL element.

Further, the invention according to claim 5, wherein the first electrode is a transparent electrode capable of transmitting light, the second electrode, any of claims 1 to 4, characterized in that a metal electrode The organic EL device according to item 1.

  According to the present invention, the first connection surface of the first external terminal connected to the planar first electrode is more than the second connection surface of the second external terminal connected to the second electrode having a small electrical resistance. Is also formed large. Thereby, in this invention, since the carrier inject | poured into a 1st electrode can be increased, the carrier which reaches | attains the center of an organic light emitting layer through a 1st electrode can be increased. As a result, in the present invention, since the light emitted at the center of the organic light emitting layer can be increased, luminance spots can be reduced.

(First embodiment)
Hereinafter, a first embodiment in which the present invention is applied to a bottom emission type organic EL element will be described with reference to the drawings. FIG. 1 is an overall perspective view of the organic EL element according to the first embodiment. FIG. 2 is an overall perspective view of the inside of the organic EL element with the sealing plate removed. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a plan view of the first transparent electrode and the second transparent electrode. In the following description, the vertical direction indicated by the arrows in FIG.

  As shown in FIGS. 1 to 5, the organic EL device 1 according to the first embodiment includes a substrate 2, a first transparent electrode 3, four second transparent electrodes 4, an insulating layer 5, and an organic light emitting layer. 6, a cathode (corresponding to the second electrode in the claims) 7, a sealing material 8, and a sealing plate 9.

  The substrate 2 is made of a glass substrate that can transmit light. The substrate 2 has a thickness of about 0.7 mm. The substrate 2 is formed in a square shape having a side of about 15 cm in plan view. The upper surface of the substrate 2 is a growth main surface 2a on which the layers 3 to 7 are formed. The lower surface of the substrate 2 is a light extraction surface 2b from which light is extracted.

The first transparent electrode 3 is for injecting holes into the organic light emitting layer 6. The first transparent electrode 3 is formed on the growth main surface 2 a of the substrate 2. The first transparent electrode 3 is formed in an octagonal shape in a region excluding the vicinity of each vertex of the growth main surface 2a. The first transparent electrode 3 is formed point-symmetrically around the center C of the organic light emitting layer 6. The first transparent electrode 3 is made of ITO (indium tin oxide) having a thickness of about 150 nm capable of transmitting light. The resistivity of ITO is on the order of 10 ⁻⁴ Ω · cm.

  The first transparent electrode 3 includes an anode (corresponding to a first electrode in claims) 11 and four anode terminals (corresponding to first external terminals in claims) 12.

  The anode 11 is electrically connected to the lower surface of the organic light emitting layer 6. The anode 11 is formed in a planar shape so as to cover substantially the entire lower surface of the organic light emitting layer 6. The anode 11 is formed inside the sealing material 8.

  The anode terminal 12 is for connecting an external power source (not shown) and the anode 11. The anode terminal 12 is formed integrally with the anode 11. The anode terminal 12 is formed along each side of the growth main surface 2 a of the substrate 2. The anode terminal 12 is formed outside the sealing material 8. The four anode terminals 12 are formed point-symmetrically around the center C of the organic light emitting layer 6. The upper surface of the anode terminal 12 is an anode connection surface 12a to which external wiring or the like is connected. A solder layer (not shown) for maintaining the entire surface at the same potential is formed on substantially the entire surface of the anode connection surface 12a.

  The second transparent electrode 4 is for connecting an external power source and the cathode 7. The second transparent electrode 4 is formed in the vicinity of each vertex of the growth main surface 2 a of the substrate 2. The 2nd transparent electrode 4 is formed in the triangle by planar view. The second transparent electrode 4 is formed point-symmetrically around the center C of the organic light emitting layer 6. The second transparent electrode 4 is made of ITO having a thickness of about 150 nm capable of transmitting light. An insulating groove 13 is formed between the second transparent electrode 4 and the first transparent electrode 3 to electrically insulate each other.

  The second transparent electrode 4 includes a connection portion 15 and a cathode terminal (corresponding to a second external terminal in claims) 16.

  The connecting portion 15 is formed inside the sealing material 8. The connecting portion 15 is electrically connected to the apex portion of the cathode 7.

  The cathode terminal 16 is formed in an L shape at each vertex of the growth main surface 2 a of the substrate 2. The cathode terminal 16 is formed outside the sealing material 8. The four cathode terminals 16 are formed point-symmetrically around the center C of the organic light emitting layer 6. The upper surface of the cathode terminal 16 is a cathode connection surface 16a to which external wiring or the like is connected. A solder layer (not shown) for keeping the entire surface at the same potential is formed on substantially the entire surface of the cathode connection surface 16a.

  Here, an area S1 of the anode connection surface 12a of the anode terminal 12 and an area S2 of the cathode connection surface 16a of the cathode terminal 16 will be described with reference to FIG. In FIG. 5, the area hatched by the thick line is the anode connection surface 12a. In FIG. 5, the area hatched by dots is the cathode connection surface 16a. The dotted line in FIG. 5 indicates the outer peripheral surface of the sealing material 8. As shown in FIG. 5, in the organic EL element 1, in order to promote hole injection, the area S1 of the anode connection surface 12a is formed to be larger than the area S2 of the cathode connection surface 16a.

The insulating layer 5 is for suppressing a short circuit between the anode 11 and the cathode 7. The insulating layer 5 is formed in an octagon shape. The central portion of the insulating layer 5 is opened to expose the anode 11. A part of the insulating layer 5 is formed in the insulating groove 13. Insulating layer 5 is made of SiO _2.

The organic light emitting layer 6 is for emitting light. The organic light emitting layer 6 is formed in an octagonal shape whose outer periphery coincides with the outer periphery of the insulating layer 5 in plan view. The organic light emitting layer 6 is formed on the anode 11 in an electrically connected state. In the organic light emitting layer 6, a hole transport layer and an electron transport layer are sequentially laminated from the anode 11 side. The hole transport layer is made of an NPD (diphenylnaphthyldiamine) film having a thickness of about 50 nm. The electron transport layer has a thickness of about 50 nm and is made of a quinolinol aluminum complex (Alq ₃ ) film mixed with a dye.

The cathode 7 is for injecting electrons into the organic light emitting layer 6. The cathode 7 is formed in a substantially square shape in plan view. The central portion of the cathode 7 is electrically connected to the organic light emitting layer 6. The cathode 7 is formed in a planar shape so as to cover substantially the entire upper surface of the organic light emitting layer 6. Each vertex of the cathode 7 is formed in a state of being electrically connected to the connection portion 15 of the second transparent electrode 4. The cathode 7 is made of an Al film having a thickness of about 100 nm. The resistivity of the Al film is on the order of 10 ⁻⁶ Ω · cm. That is, the resistivity of the Al film constituting the cathode 7 is two orders of magnitude smaller than the resistivity of ITO constituting the anode 11. From this, it can be seen that the anode 11 has higher resistance than the cathode 7. In addition, the anode 11, the organic light emitting layer 6, and the cathode 7 correspond to the light emission part of a claim.

  The sealing plate 9 is for sealing a region where the organic light emitting layer 6 is formed. The sealing plate 9 is sealed to the first transparent electrode 3 and the second transparent electrode 4 by a sealing material 8 made of UV curable resin.

  Next, the operation of the organic EL element 1 according to the first embodiment described above will be described.

  First, holes are injected into the anode terminal 12 of the organic EL element 1 from an external power source. Further, electrons are injected into the cathode terminal 16 of the organic EL element 1 from an external power source. Holes injected from the anode terminal 12 are injected into the organic light emitting layer 6 through the anode 11. On the other hand, electrons injected from the cathode terminal 16 are injected into the organic light emitting layer 6 through the connection portion 15 and the cathode 7. The holes and electrons injected into the organic light emitting layer 6 recombine to emit light. The emitted light passes through the anode 11 and the substrate 2 and is irradiated from the light extraction surface 2b to the outside.

  Next, a method for manufacturing the organic EL element 1 according to the first embodiment will be described. 6-15 is a figure explaining each manufacturing process of the organic EL element by 1st Embodiment. 6, 10, 12, and 14 are cross-sectional views at the same position as the line III-III in FIG. 1 in each manufacturing process of the organic EL element according to the first embodiment. 7 and 8 are cross-sectional views at the same position as the line IV-IV in FIG. 1 in each manufacturing process of the organic EL element according to the first embodiment. 9, 11, 13, and 15 are plan views in each manufacturing process of the organic EL element according to the first embodiment.

  First, as shown in FIGS. 6 and 7, the first transparent electrode 3 and the second transparent electrode 4 made of ITO are formed on the entire growth main surface 2a of the substrate 2 by sputtering.

  Next, as shown in FIG. 8, a resist film 51 is formed on the upper surfaces of the transparent electrodes 3 and 4 by photolithography so that the region where the insulating groove 13 is formed is exposed. Thereafter, an insulating groove 13 is formed between the first transparent electrode 3 and the second transparent electrode 4 by an etching method. Thereafter, as shown in FIG. 9, the resist film 51 is removed. Thereby, the transparent electrodes 3 and 4 patterned on the main growth surface 2a of the substrate 2 are completed.

Next, as shown in FIGS. 10 and 11, the insulating layer 5 made of patterned SiO ₂ is formed on the anode 11 and in the insulating groove 13 by sputtering, photolithography, and etching.

  Next, as shown in FIG. 12, the octagonal organic light emitting layer 6 shown in FIGS. 12 and 13 is deposited on the anode 11 using a shadow mask 52 having an opening 52 a formed in the center.

  Next, as shown in FIG. 14, using a shadow mask 53 having an opening 53a formed at the center, a substantially square cathode 7 made of an Al film is subjected to organic light emission as shown in FIGS. Vapor deposition is performed on the layer 6 and the second transparent electrode 4.

  Next, as shown in FIGS. 1 and 3, the organic EL element 1 is completed by sealing the sealing plate 9 via the sealing material 8.

  As described above, the organic EL element 1 is formed such that the area S1 of the anode connection surface 12a of the planar anode terminal 12 is larger than the area S2 of the cathode connection surface 16a of the cathode terminal 16. As a result, more holes can be injected into the anode terminal 12, so that more holes can reach the center of the anode 11 made of ITO having a high resistance. For this reason, since many holes are injected also into the center part of the organic light emitting layer 6, recombination of a hole and an electron can be improved. As a result, the luminance at the central portion can be improved, and luminance spots can be reduced.

  In the organic EL element 1, the anode terminal 12 is formed along each side of the growth main surface 2a, and the cathode terminal 16 is formed in the vicinity of each vertex of the growth main surface 2a. Thereby, the distance between the anode terminal 12 and the center C of the organic light emitting layer 6 can be made smaller than the distance between the cathode terminal 16 and the center C of the organic light emitting layer 6. As a result, since the electrical resistance to the center of the anode terminal 12 and the anode 11 can be reduced, the number of holes reaching the center of the anode 11 can be increased. As a result, since the brightness at the center C of the organic light emitting layer 6 can be improved, brightness spots can be further reduced.

  In the organic EL element 1, the anode terminal 12 and the cathode terminal 16 are formed point-symmetrically around the center C of the organic light emitting layer 6. Thereby, since holes and electrons are uniformly injected from the terminals 12 and 16 to the center of the organic light emitting layer 6, luminance unevenness can be further reduced.

  In the organic EL element 1, the planar light-emitting anode terminal 12 and the planar cathode terminal 16 are formed so as to cover substantially the entire area of both surfaces of the organic light-emitting layer 6. Can be made. Thereby, brightness spots can be further reduced.

  In the organic EL element 1, the anode 11 and the anode terminal 12 are integrally formed on the growth main surface 2a with the same material (ITO). Furthermore, in the organic EL element 1, the first transparent electrode 3 and the second transparent electrode 4 are made of the same material (ITO). By these, since the 1st transparent electrode 3 and the 2nd transparent electrode 4 can be formed simultaneously by patterning, a manufacturing process can be simplified.

Here, the experiment conducted in order to prove the effect of the organic EL element 1 by 1st Embodiment is demonstrated. In this experiment, the luminance at five locations on the light extraction surface 2b was measured, and the luminance distribution was examined from the luminance at each point. Of the five locations where the luminance is measured, one is the center of the light extraction surface 2b (center C of the organic light emitting layer 6). The remaining four points P (see FIG. 5) are on four perpendicular lines from the center of the light extraction surface 2b to each side. Further, the four points P on the vertical line are all the same distances from the center and are in the vicinity of each side of the light extraction surface 2b. The average luminance of the entire surface was 2200 cd / m ² .

Here, the luminance distribution [%] is
Luminance distribution [%] = 100 × (Standard deviation of luminance) / (Average value of luminance)
And The luminance is measured three times at each measurement location.

  Moreover, in order to compare with the organic EL element 1 by 1st Embodiment, the organic EL element for a comparison (henceforth a comparative example) was produced. In the comparative example, substrates having the same size and shape were used. And the anode terminal was formed along two opposing sides, and the cathode terminal was formed along the other two opposing sides. The comparative example has the same configuration as that of the first embodiment except for external terminals.

  In this experiment, the luminance distribution of the comparative example was about 35%, whereas the organic EL element according to the first embodiment could be reduced to about 14%. Thereby, in the organic EL element by 1st Embodiment, it turns out that the fall of the brightness | luminance of the center part with respect to the outer peripheral part of a light emission area can be suppressed. Furthermore, in the organic EL device according to the first embodiment, it can be seen that the holes injected into the central portion can be increased.

(Second Embodiment)
Next, an organic EL element according to the second embodiment, in which a part of the first embodiment described above is changed, will be described with reference to the drawings. FIG. 16 is an overall perspective view of the organic EL element according to the second embodiment. FIG. 17 is a plan view of the transparent electrode. In FIG. 16, the sealing material 8 and the sealing plate 9 are indicated by dotted lines for convenience. Moreover, in FIG. 17, the outer periphery of the sealing material 8 is shown with a dotted line. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment, and description is abbreviate | omitted.

  As shown in FIGS. 16 and 17, in the organic EL element 1A according to the second embodiment, the shapes of the first transparent electrode 3A and the second transparent electrode 4A formed on the substrate 2 are different from those in the first embodiment. .

  The first transparent electrode 3A is formed in a cross shape in a region other than the vicinity of the apex of the growth main surface 2a (see FIG. 3) of the substrate 2. The first transparent electrode 3 </ b> A includes an anode 11 </ b> A inside the sealing material 8 and an anode terminal 12 </ b> A outside the sealing material 8.

  The second transparent electrode 4 </ b> A is formed in a square shape in the vicinity of each vertex of the growth main surface 2 a of the substrate 2. An insulating groove 13 for insulating each other is formed between the second transparent electrode 4A and the first transparent electrode 3A. The second transparent electrode 4 </ b> A includes a connection portion 15 </ b> A inside the sealing material 8 and a cathode terminal 16 </ b> A outside the sealing material 8.

  Here, as is apparent from FIG. 17, the area S1 of the anode connection surface 12Aa of the anode terminal 12A is larger than the area S2 of the cathode connection surface 16Aa of the cathode terminal 16A. Further, the anode terminal 12 </ b> A is formed along each side of the substrate 2. On the other hand, the cathode terminal 16 </ b> A is formed in the vicinity of each vertex of the growth main surface 2 a of the substrate 2. Furthermore, the terminals 12 </ b> A and 16 </ b> A are formed point-symmetrically around the center C of the organic light emitting layer 6. As a result, the organic EL element 1A according to the second embodiment can achieve the same effects as the organic EL element 1 according to the first embodiment.

(Third embodiment)
Next, an organic EL element according to the third embodiment, in which a part of the first embodiment described above is changed, will be described with reference to the drawings. FIG. 18 is a plan view of a transparent electrode according to the third embodiment. In FIG. 18, the outer periphery of the sealing material 8 is indicated by a dotted line.

  As shown in FIG. 18, in the organic EL element according to the third embodiment, the shapes of the first transparent electrode 3B and the second transparent electrode 4B formed on the growth main surface 2a (see FIG. 3) of the substrate 2 are Different from one embodiment.

  The first transparent electrode 3B is formed on substantially the entire growth main surface 2a except that the central portion of each side of the growth main surface 2a of the substrate 2 is removed in a square shape. The first transparent electrode 3 </ b> B includes an anode 11 </ b> B inside the sealing material 8 and an anode terminal 12 </ b> B outside the sealing material 8.

  The second transparent electrode 4B is formed in a square shape at the center of each side of the growth main surface 2a of the substrate 2. An insulating groove 13 for insulating each other is formed between the second transparent electrode 4B and the first transparent electrode 3B. The second transparent electrode 4 </ b> B includes a connection portion 15 </ b> B inside the sealing material 8 and a cathode terminal 16 </ b> B outside the sealing material 8.

  Here, as apparent from FIG. 18, the anode connection surface 12Ba of the anode terminal 12B is larger than the cathode connection surface 16Ba of the cathode terminal 16B. The terminals 12B and 16B are formed point-symmetrically around the center C of the organic light emitting layer 6. Thereby, the organic EL element by 3rd Embodiment can reduce a brightness spot.

(Fourth embodiment)
Next, an organic EL element according to the fourth embodiment, in which a part of the above-described first embodiment is changed, will be described with reference to the drawings. FIG. 19 is a plan view of a substrate and a transparent electrode according to the fourth embodiment. In FIG. 19, the outer periphery of the sealing material 8 is indicated by a dotted line.

  As shown in FIG. 19, in the organic EL device according to the fourth embodiment, the substrate 2C is formed in a regular hexagonal shape. Accordingly, in the organic EL element according to the fourth embodiment, the shapes of the first transparent electrode 3C and the second transparent electrode 4C formed on the substrate 2C are different from those of the first embodiment.

  The first transparent electrode 3C is formed in a dodecagonal shape in a region other than the vicinity of the apex of the substrate 2C. The first transparent electrode 3 </ b> C includes an anode 11 </ b> C inside the sealing material 8 and an anode terminal 12 </ b> C outside the sealing material 8.

  The second transparent electrode 4C is formed in a triangular shape near each vertex of the substrate 2C. An insulating groove 13 is formed between the second transparent electrode 4C and the first transparent electrode 3C to insulate each other. The second transparent electrode 4 </ b> C includes a connection portion 15 </ b> C inside the sealing material 8 and a cathode terminal 16 </ b> C outside the sealing material 8.

  Here, as apparent from FIG. 19, the anode connection surface 12Ca of the anode terminal 12C is larger than the cathode connection surface 16Ca of the cathode terminal 16C. The anode terminal 12C is formed along each side of the upper surface (growth main surface) of the substrate 2C. On the other hand, the cathode terminal 16C is formed in the vicinity of each vertex on the upper surface of the substrate 2C. Further, the terminals 12 </ b> C and 16 </ b> C are formed point-symmetrically around the center C of the organic light emitting layer 6. As a result, the organic EL element according to the fourth embodiment can achieve the same effects as the organic EL element 1 according to the first embodiment.

  As mentioned above, although this invention was demonstrated in detail using embodiment, this invention is not limited to embodiment described in this specification. The scope of the present invention is determined by the description of the claims and the scope equivalent to the description of the claims. Hereinafter, modified embodiments in which the above-described embodiment is partially modified will be described.

  The numerical values, materials, shapes, and the like in each of the embodiments described above can be changed as appropriate.

  Moreover, although each embodiment mentioned above demonstrated the bottom emission type | mold as an example, you may apply this invention to a top emission type organic EL element.

  In the above-described embodiment, the anode terminal and the cathode terminal are formed point-symmetrically around the center of the organic light emitting layer, but may be formed rotationally symmetrical around the center of the organic light emitting layer. A straight line passing through the center may be sandwiched and formed symmetrically.

1 is an overall perspective view of an organic EL element according to a first embodiment. It is a whole perspective view inside an organic EL element. It is sectional drawing along the III-III line of FIG. It is sectional drawing along the IV-IV line of FIG. It is a top view of the 1st transparent electrode and the 2nd transparent electrode. It is sectional drawing of the same position as the III-III line | wire of FIG. 1 in each manufacturing process of the organic EL element by 1st Embodiment. It is sectional drawing of the same position as the IV-IV line | wire of FIG. 1 in each manufacturing process of the organic EL element by 1st Embodiment. It is sectional drawing of the same position as the IV-IV line | wire of FIG. 1 in each manufacturing process of the organic EL element by 1st Embodiment. It is a top view in each manufacturing process of the organic EL element by 1st Embodiment. It is sectional drawing of the same position as the III-III line | wire of FIG. 1 in each manufacturing process of the organic EL element by 1st Embodiment. It is a top view in each manufacturing process of the organic EL element by 1st Embodiment. It is sectional drawing of the same position as the III-III line | wire of FIG. 1 in each manufacturing process of the organic EL element by 1st Embodiment. It is a top view in each manufacturing process of the organic EL element by 1st Embodiment. It is sectional drawing of the same position as the III-III line | wire of FIG. 1 in each manufacturing process of the organic EL element by 1st Embodiment. It is a top view in each manufacturing process of the organic EL element by 1st Embodiment. It is a whole perspective view of the organic EL element by 2nd Embodiment. It is a top view of a transparent electrode. It is a top view of the transparent electrode by 3rd Embodiment. It is a top view of the board | substrate and transparent electrode by 4th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A Organic EL element 2, 2C board | substrate 2a Growth main surface 2b Light extraction surface 3, 3A, 3B, 3C 1st transparent electrode 4, 4A, 4B, 4C 2nd transparent electrode 5 Insulating layer 6 Organic light emitting layer 7 Cathode 8 Sealing material 9 Sealing plate 11, 11A, 11B, 11C Anode 12, 12A, 12B, 12C Anode terminal 12a, 12Aa, 12Ba, 12Ca Anode connecting surface 13 Insulating groove 15, 15A, 15B, 15C Connecting portion 16, 16A, 16B, 16C Cathode terminals 16a, 16Aa, 16Ba, 16Ca Cathode connection surface C Center S1 area S2 Area

Claims (5)

A substrate,
The substrate including a planar first electrode, a planar second electrode having a smaller electrical resistance than the first electrode, and an organic light emitting layer formed between the first electrode and the second electrode, A light emitting part formed on the top;
A first external terminal formed on the substrate and connected to the first electrode;
A second external terminal formed on the substrate and connected to the second electrode;
The surface of the first external terminal connected to the outside is the first connection surface,
The surface of the second external terminal connected to the outside is the second connection surface,
Towards the area of the first connecting surface than the area of the second connecting face is rather large,
The substrate has a polygonal shape,
The first external terminal is formed along a side of the polygonal substrate,
The organic EL element, wherein the second external terminal is formed at the apex of the polygonal substrate .   2. The organic EL device according to claim 1, wherein the first external terminal and the second external terminal are symmetrical with respect to a center of the organic light emitting layer or a straight line passing through the center.   The first electrode is formed on the substrate;
  The organic EL device according to claim 1, wherein the first electrode and the first external terminal are integrally formed of the same material.   The organic EL element according to claim 1, wherein the first external terminal and the second external terminal are made of the same material.   The first electrode is a transparent electrode capable of transmitting light,
  The organic EL element according to claim 1, wherein the second electrode is a metal electrode.

Images