JP2006127916A - Sealing member for organic electroluminescent element, and organic electroluminescent element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing member for an organic electroluminescent element in which injection of electric power with a low loss is possible without making a light emitting area smaller and in which connection to an external circuit is easily carried out with no need of working such as a through hole. <P>SOLUTION: This is the sealing member A to seal an organic light emitting layer 3 of the organic electroluminescent element 4 formed by installing the organic light emitting layer 3 between two electrodes 1, 2. The sealing member A is provided with an auxiliary electrode 5, a conductive part 6 which is connected to the auxiliary electrode 5 and connectable and opposed to the electrodes 1, 2 of the organic electroluminescent element 4, and the external electrode 7 connected to the auxiliary electrode 5 and exposed on the outer face of the sealing member A. There is no need of making the light emitting area smaller as in the case the auxiliary electrode is installed at the electrodes 1, 2 formed at a transparent electrode of the organic electroluminescent element 4, and furthermore the external electrode 7 connected to the auxiliary electrode 5 is installed while exposed on the outer face of the sealing member A, thereby there is no need of working such as the through hole. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sealing member applied to an organic electroluminescent element used for a large area display, a backlight for a liquid crystal display, an electric decoration, a light source for signage, a light emitting poster, a light source for illumination, and the like. The present invention relates to an organic electroluminescent device provided.

  In general, an organic electroluminescent device is formed by laminating an anode, a hole transport layer, an organic light emitting layer, an electron injection layer, and a cathode made of a transparent electrode in this order on the surface of one side of a transparent substrate. Then, by applying a voltage between the anode and the cathode, the electrons injected from the cathode side and the holes injected from the anode side recombine in the organic light emitting layer, and the light emitted from the organic light emitting layer is transparent electrode. And is taken out through a transparent substrate.

  Here, there are many factors that dominate the lifetime of the organic electroluminescent device, and well-known factors are due to moisture and oxygen in the air. Moisture adversely affects, for example, the interface between the organic light emitting layer and the electrode, and as a result, a dot-like non-light emitting portion called a dark spot is generated and affects the life. Oxygen causes oxidation of organic matter. Therefore, it is not preferable for the lifetime to exist. Therefore, in order to reduce the adverse effects of moisture and oxygen and extend the life, glass or metal cans are sealed to the organic electroluminescent device, or a film having a high gas barrier property is formed on the organic electroluminescent device. Conventionally, the organic electroluminescent element is sealed so that water, oxygen, etc. do not touch the organic electroluminescent element. Such sealing is indispensable in the organic electroluminescence device from the viewpoint of its lifetime.

  When the organic electroluminescent device is sealed as described above, the electrode for supplying power to the organic electroluminescent device can be taken out from the unsealed portion, specifically, from the peripheral portion of the substrate provided with the organic light emitting layer. In general, power is supplied to the organic electroluminescent device located inside the substrate by an anode or a cathode made of a transparent electrode provided on the substrate and a counter electrode formed corresponding thereto. . Here, power loss due to electrode resistance when supplying power to the anode or cathode made of a transparent electrode is hardly a problem when the size of the substrate is small, but the area of the organic electroluminescent element and the area of the substrate are increased. As the electrode resistance increases, for example, when it is formed as a display of several tens of inches or a light emitting body of the order of several tens of centimeters, the power loss cannot be ignored. As a result, the efficiency of the light emitting body is reduced or heat is generated. There is a risk of causing problems such as a reduction in the lifetime of the light emitter.

  Therefore, in order to solve this problem, it has been conventionally performed to provide an auxiliary electrode made of a low-resistance metal on a substrate. That is, in the case of a transparent electrode alone by forming an auxiliary electrode by providing a low-resistance metal such as Cr, Ni, Au, etc. with a narrow width on or adjacent to the transparent electrode provided on the substrate In comparison, it is possible to reduce power loss due to electrode resistance. However, since an organic electroluminescent element generally takes out light generated through a transparent electrode on one side (for example, a transparent electrode formed on a transparent substrate), an auxiliary electrode is provided on the transparent electrode. Then, light cannot be extracted from the portion where the auxiliary electrode is provided. As a result, the light emission area is reduced and the light extraction efficiency is lowered, which is not preferable.

  For this reason, a method of providing the auxiliary electrode at a place other than the substrate has been studied. For example, in Patent Document 1 and Patent Document 2, a through hole is provided in a sealing plate for sealing an organic electroluminescent element, and an outer conductive pattern and an inner conductive pattern are connected through the through hole. It has been proposed to use the conductive pattern as an auxiliary electrode. However, processing for providing a large number of through holes in the sealing plate is difficult, and there is a problem that sealing performance may be deteriorated at the through hole portions.

Patent Document 3 describes a method of connecting an auxiliary electrode to an electrode of an organic light emitting element via a conductor. However, in this invention, the electrode of the organic light emitting device and the auxiliary electrode are in contact with each other at a plurality of locations, but no consideration is given to connection with the auxiliary electrode.
Japanese Patent No. 3290584 JP 2000-317940 A Japanese Patent Laid-Open No. 2002-033198

  The present invention has been made in view of the above points, and can make it possible to inject electric power with low loss without reducing the light emitting area, and to an external circuit without the need to process through holes or the like. It is an object of the present invention to provide an organic electroluminescent element sealing member and an organic electroluminescent element that can be easily connected and can reduce the space for connection to an external circuit.

  The organic electroluminescent element sealing member according to claim 1 of the present invention seals the organic light emitting layer 3 of the organic electroluminescent element 4 formed by providing the organic light emitting layer 3 between the two electrodes 1 and 2. A sealing member A for stopping, and the sealing member A includes an auxiliary electrode 5 and a conduction portion 6 connected to the auxiliary electrode 5 and facing the electrodes 1 and 2 of the organic electroluminescent element 4 so as to be connectable. The external electrode 7 connected to the auxiliary electrode 5 and exposed to the outer surface of the sealing member A is provided.

  According to a second aspect of the present invention, in the first aspect, the sealing member A includes a sealing plate 8 provided with an auxiliary electrode 5 disposed to face the organic light emitting layer 3 of the organic electroluminescent element 4, and an organic light emitting device. It is characterized by being provided with a bonding member 9 that can be bonded between the organic electroluminescent element 4 and the sealing plate 8 at a position surrounding the layer 3.

  According to a third aspect of the present invention, in the second aspect, the thickness of at least a part of the end of the sealing plate 8 is made thinner than other portions, and the external electrode 7 is formed on the thin portion 10 of the sealing plate 8. And the bonding member 9 is bonded to a thick portion of the sealing plate 8.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the conductive portion 6 is provided so as to protrude from the surface of the sealing member A.

  The organic electroluminescent element according to claim 5 of the present invention is configured to seal the organic light emitting layer 3 in the organic electroluminescent element 4 formed by providing the organic light emitting layer 3 between the two electrodes 1 and 2. The sealing member A according to any one of claims 1 to 4 is adhered to the sealing member A.

  According to the present invention, since the auxiliary member 5 is provided on the sealing member A for sealing the organic light emitting layer 3, the auxiliary electrode is provided on the electrodes 1 and 2 formed by the transparent electrode of the organic electroluminescent element 4. In this way, it is possible to inject power with low loss without reducing the light emitting area. Further, the external electrode 7 connected to the auxiliary electrode 5 is provided to be exposed on the outer surface of the sealing member A, so that it is not necessary to process a through hole or the like, and connection to an external circuit can be easily performed. At the same time, the space for connection with an external circuit can be reduced.

  Hereinafter, the best mode for carrying out the present invention will be described.

The organic electroluminescent element 4 is formed by interposing an organic light emitting layer 3 between two electrodes 1 and 2 serving as an anode or a cathode and laminating them on one side of a substrate 15 to form as shown in FIG. It is what is done. The organic light emitting layer 3 is provided with a hole transport layer on the anode side and an electron injection layer on the cathode side, as necessary, but these are not shown. The electrode 1 provided on the surface of the substrate 15 may be formed as an anode, and the other electrode 2 may be formed as a cathode. Conversely, the electrode 1 provided on the surface of the substrate 15 is formed as a cathode and the other electrode 2 is formed as an anode. You may do it. When the light emitted from the organic light emitting layer 3 is emitted through the substrate 15, the substrate 15 is formed of a light transmissive material such as glass, and the electrode 1 provided on the surface of the substrate 15 is also formed as a transparent electrode. Is. As a material for the transparent electrodes of the electrodes 1 and 2, CuI, ITO (indium tin oxide), SnO ₂ , zinc oxide-based material, IZO (indium zinc oxide), or the like can be used.

  FIG. 2 shows an example of an embodiment of the sealing member A. The sealing member A is formed by including a sealing plate 8 and a frame-shaped joining member 9. The sealing plate 8 and the joining member 9 are formed of a gas-impermeable material, and the auxiliary electrode 5 is provided on the sealing plate 8.

  The auxiliary electrode 5 preferably has a conductivity at least equal to or higher than that of the electrodes 1 and 2 constituting the organic electroluminescent element 4. Although not particularly limited, specifically, metals such as Cr, Cu, Ag, Ni, Au, Nd, Al, Au, Pt, ITO, NESA (tin oxide), IZO, zinc oxide, oxidation Examples thereof include conductive pastes such as indium-based transparent conductors, conductive organic materials, silver pastes, and carbon pastes. A large number of auxiliary electrodes 5 are formed in a feed circuit pattern, and the width and thickness of the auxiliary electrode 5 are arbitrarily selected according to the characteristics of the material used, the shape of the corresponding organic electroluminescent element 4, and the like. Is possible. Moreover, the pattern of the auxiliary electrode 5 can be formed in an arbitrary shape as required by an arbitrary method such as etching, pattern sputtering, coating, laser processing, cutting, sticking, and printing.

  The auxiliary electrode 5 is generally formed on the surface of the sealing member A facing the organic electroluminescent element 4, that is, on one surface of the sealing plate 8 as shown in FIG. It may be formed inside the stop member A. When the auxiliary electrode 5 is formed inside the sealing member A, for example, two members each having the auxiliary electrode 5 formed on the surface thereof are laminated, or the surface of the sealing member A is engraved, and the auxiliary electrode 5 is engraved at the site. When the sealing member A is formed, the auxiliary electrode 5 is embedded in the sealing member A, or an insulating layer is formed on the auxiliary electrode 5 formed on the surface of the sealing member A. Further, the auxiliary electrode 5 can be formed thereon, or an arbitrary method can be adopted. By forming the auxiliary electrode 5 inside the sealing member A in this way, it becomes possible to form the surface of the sealing member A flat and insulative, and to the surface of the sealing member A inside the sealing member A. The auxiliary electrode 5 can be further formed in a pattern different from the provided auxiliary electrode 5, and the auxiliary electrode 5 can be formed at a high density. For example, the cathode auxiliary electrode and the anode auxiliary electrode are laminated. The signal auxiliary electrode and the driving auxiliary electrode can be formed.

  One end on the end side of the sealing plate 8 of the auxiliary electrode 5 formed as a power supply circuit pattern is the external electrode 7. In the embodiment of FIGS. This portion is formed as the external electrode 7 by bending one side end of the auxiliary electrode 5 along. A conductive portion 6 is provided at the other end of the auxiliary electrode 5. The conducting part 6 is provided in contact with and electrically connected to the auxiliary electrode 5, and protrudes toward the organic electroluminescent element 4 on the surface of the sealing plate 8 facing the organic electroluminescent element 4. It is provided to do. The shape and material of the conducting portion 6 are not particularly limited, but can be formed into, for example, a sheet shape, a hemispherical shape, a column shape, a cone shape, a needle shape, and the like, and is convex with respect to the surface of the auxiliary electrode 5. It can be formed of a metal having a shape, a metal / resin mixed conductor such as silver paste, a conductive pin with a spring, an anisotropic conductive film, or the like. The conducting portion 6 may be provided when the auxiliary electrode 5 is formed and may be formed in advance, but the conducting portion 6 is formed each time the organic electroluminescent element 4 is actually sealed. You may do it. Moreover, the kind and resistance value of the conduction | electrical_connection part 6 can be selected as needed based on the electric current value which supplies with electricity.

  In sealing the organic electroluminescent element 4 using the sealing member A formed with the auxiliary electrode 5, the external electrode 7, and the conducting portion 6 as described above, as shown in FIG. The side of the substrate 15 of the light emitting element 4 on which the organic light emitting layer 3 is provided faces the side of the sealing plate 8 on which the auxiliary electrode 5 and the conduction portion 6 are provided, and the ends of the organic electroluminescent element 4 and the sealing plate 8 A frame-shaped joining member 9 is disposed between the portions so as to surround the organic light emitting layer 3. Then, the bonding member 9 is bonded to the substrate 15 and the sealing plate 8 of the organic electroluminescent element 4 with a sealing adhesive, and the organic light emitting layer 3 is hermetically surrounded by the sealing plate 8 and the bonding member 9. As shown in FIG. 1, the organic electroluminescent element 4 can be sealed. When the sealing plate 8 is attached to the organic electroluminescent element 4 via the bonding member 9 in this way, the conducting portion 6 provided on the sealing plate 8 contacts the electrode 1 and / or the electrode 2 of the organic electroluminescent element 4. The electrodes 1 and 2 of the organic electroluminescent element 4 and the auxiliary electrode 5 of the sealing member A can be conductively connected by the conductive portion 6. Further, since one end of the auxiliary electrode 5 is led out to the side end face of the sealing plate 8 and the external electrode 7 is formed, the external electrode 7 is exposed to the outside of the sealing member A. This external electrode An external circuit can be connected to 7. Accordingly, the electrodes 1 and 2 of the organic electroluminescent element 4 can be energized from the external electrode 7 through the auxiliary electrode 5 and the conducting portion 6, and the electric resistance is higher than that of the electrodes 1 and 2 formed of transparent electrodes. Through the auxiliary electrode 5 that can be formed small, the organic electroluminescence device 4 can be energized with little power loss.

  As described above, when sealing the organic electroluminescent element 4 with the sealing member A according to the present invention, the auxiliary electrode 5 is provided on the sealing member A, and thus is independent of the position of the light emitting portion of the organic electroluminescent element 4. It is possible to form the auxiliary electrode 5 by disposing them. Therefore, the thickness dimension, width dimension, and transparency of the auxiliary electrode 5 can be arbitrarily set. For the organic electroluminescent element 4 having a large light emitting area, that is, the organic electroluminescent element 4 requiring a large current. However, a necessary amount of current can be applied with low power loss.

  Here, it is preferable that the conduction | electrical_connection part 6 protrudes in the organic electroluminescent element 4 side from the surface of the sealing member A as mentioned above. Thus, when the conduction | electrical_connection part 6 is provided and protruded, when conducting sealing by arrange | positioning the sealing member A facing the organic electroluminescent element 4, the conduction | electrical_connection part 6 is an electrode of the organic electroluminescent element 4. FIG. 1 and 2 can be connected in contact with each other, and there is no need to provide a protruding portion on the organic electroluminescent element 4 side or a portion to be connected to the conducting portion 6.

  Further, since the external electrode 7 is provided so as to be exposed on the side surface of the sealing member A, an external circuit can be connected to the auxiliary electrode 5 by the external electrode 7. Therefore, it is not necessary to process a through hole in the sealing member A for connection with an external circuit, and the connection of the external circuit to the auxiliary electrode 5 can be easily performed. Here, when the electrode 1 provided on the substrate 15 of the organic electroluminescent element 4 is directly connected to an external circuit, the external electrode 7 must be provided at the end of the substrate 15, and the end of the substrate 15 emits light. Although there is a non-light emitting portion that cannot form a surface, in the present invention, since the external electrode 7 is provided on the sealing member A, it is not necessary to provide the external electrode 7 on the substrate 15. It is possible to increase the light emission efficiency by reducing the non-light emitting portion.

  In exposing the external electrode 7 to the outside of the sealing member A, one end of the auxiliary electrode 5 is extended to the end surface of the sealing plate 8 as in the embodiment of FIGS. In addition to forming the external electrode 7, when the organic electroluminescent element 4 is sealed by forming the sealing plate 8 slightly larger than the organic electroluminescent element 4 as shown in FIG. The end of the sealing plate 8 projects outward from the bonding member 9, and one end of the auxiliary electrode 5 formed on the surface of the sealing plate 8 is exposed outside the sealing member A at the end of the sealing plate 8. The exposed end portion of the auxiliary electrode 5 may be formed as the external electrode 7. Further, as shown in FIG. 3B, by providing the end of the auxiliary electrode 5 inside the sealing member A (sealing plate 8), it is exposed to the side end face of the sealing member A (sealing plate 8). The exposed end portion of the auxiliary electrode 5 may be formed as the external electrode 7.

  Moreover, in said embodiment, the sealing member A is formed from the sealing board 8 which comprises the surface of sealing, and the joining member 9 which comprises the edge | side of sealing, and before sealing as needed Alternatively, the sealing plate 8 and the joining member 9 are integrated when sealing. Thus, by making the joining member 9 which is a side member joined to the organic electroluminescent element 4 as a separate structure, the entire surface of the sealing plate 8 becomes flat, and the auxiliary electrode 5 is provided on the surface of the sealing plate 8. When forming, the degree of freedom of patterning becomes high and the processing becomes easy. Also, when the auxiliary electrode 5 is formed inside the sealing plate 8, lamination and the like can be easily performed. Of course, in addition to forming the sealing member A from a plurality of members of the sealing plate 8 and the joining member 9, it is also possible to form the sealing member A by a single member.

  The material of the bonding member 9 is preferably the same as the material of the sealing plate 8 from the viewpoint of dimensional consistency, but is not particularly limited and is appropriately selected as necessary. For example, when the sealing plate 8 is made of glass, a ring-shaped thin member formed of glass with dimensions corresponding to the periphery of the sealing plate 8 can be used as the joining member 9.

  FIG. 4 shows another example of the embodiment of the present invention, which gives a problem in the connection between the external electrode 7 and the electrodes 1 and 2 of the organic electroluminescent element 4 inside the frame-shaped joining member 9. The spacer 17 is arranged at a place where there is not. By using the spacer 17 in this way, the distance between the organic electroluminescent element 4 and the sealing plate 8 can be regulated, and even if the organic electroluminescent element 4 has a large light emitting area, The distance between them can be kept constant. The spacer 17 may be formed integrally with the bonding member 9 or may be formed separately. As the spacer 17, glass particles, plastic particles, silica, alumina, and insulating particles of this kind can be preferably used. It is also possible for the conducting portion 6 to have the function of the spacer 17.

  FIG. 5 shows another example of the embodiment of the present invention, in which the thickness of at least a part of the end of the sealing plate 8 is made thinner than other parts such as the central part of the sealing plate 8. is there. For example, the end of the surface of the sealing plate 8 having a constant thickness facing the organic electroluminescent element 4 is cut off obliquely and formed on the inclined surface 19 that is further away from the organic electroluminescent element 4 toward the outer side. A portion 10 where the thickness is reduced is provided at the end of the plate 8. The auxiliary electrode 5 is provided on the surface of the sealing plate 8 on the organic electroluminescent element 4 side in the same manner as described above, and one end of the auxiliary electrode 5 is provided along the slope 19. Thus, the external electrode 7 is formed at the portion provided on the inclined surface 19 of the auxiliary electrode 5, and the external electrode 7 can be provided at the thin portion 10 at the end of the sealing plate 8. . Other configurations are the same as those in the above embodiments.

  The side where the organic light emitting layer 3 of the organic electroluminescent element 4 is provided and the side where the auxiliary electrode 5 of the sealing plate 8 is provided face each other, and between the organic electroluminescent element 4 and the end of the sealing plate 8. A frame-shaped bonding member 9 is disposed, and the bonding member 9 is bonded to the substrate 15 and the sealing plate 8 of the organic electroluminescent element 4 with a sealing adhesive, whereby the organic light emitting layer 3 is bonded to the sealing plate 8. The organic electroluminescent element 4 can be sealed by being hermetically surrounded by the bonding member 9. At this time, as shown in FIG. 5, the joining member 9 is bonded to a thick portion at a position inside the thin portion 10 at the end of the sealing plate 8, and the sealing plate 8 is thin. The external electrode 7 formed on the portion 10 is exposed to the outside of the sealing member A without being covered with the bonding member 9. Accordingly, by connecting an external circuit to the external electrode 7, the organic electroluminescent element 4 can be energized in the same manner as described above.

  Here, as in the embodiment of FIG. 5, a slope 19 is formed at the end of the sealing plate 8, and the external electrode 7 is provided on the slope 19, so that the joining member 9 is sealed from above the slope 19. 8, the sealing plate 8 is bonded to the surface of the thick portion of the sealing plate 8 on the inner side of the slope 19, and the external electrode 7 is interposed between the slope 19 and the bonding member 9. In this space, it can be exposed to the outside of the sealing member A.

  Further, in the embodiment of FIG. 6, in the embodiment of FIG. 5, a portion closer to the inside of the surface of the bonding member 9 on the organic electroluminescent element 4 side is formed on the inclined surface 20 that is further away from the organic electroluminescent element 4 toward the inner side. Thus, the outer portion of the joining member 9 is formed as a thick portion 9a, and the inner portion is formed as a thin portion 9b. Other configurations are the same as those in FIG. When the bonding member 9 is bonded to the substrate 15 and the sealing plate 8 of the organic electroluminescence device 4 to seal the organic electroluminescence device 4, the thick portion 9a of the bonding member 9 is the organic electroluminescence device. 4 is bonded to the substrate 15, and the thin portion 9 b is not bonded to the substrate 15. Therefore, the width of the portion where the bonding member 9 is bonded to the substrate 15 can be reduced, the area of the peripheral portion of the substrate 15 where the organic light emitting layer 3 cannot be formed can be reduced, and the area of the light emitting portion can be increased. It becomes possible to secure.

  Next, the present invention will be specifically described with reference to examples.

Example 1
Using a glass plate sputtered with 1100 mm thick ITO (sheet resistance 12 Ω / □), ITO was patterned and a cathode with a pattern of a = 10 mm, b = 10 mm, c = 5 mm as shown in FIG. While forming the electrode 1), the glass plate was cut | disconnected to the magnitude | size of 100 mm x 100 mm, and the board | substrate 15 which provided the electrode 1 in the single side | surface was produced. The substrate 15 was subjected to ultrasonic cleaning for 10 minutes each with pure water, acetone, and isopropyl alcohol, then steam-cleaned for 2 minutes with isopropyl alcohol vapor, dried, and then UV-ozone cleaned for 30 minutes.

Next, as shown in FIG. 8A, a mask 23 having a size of 120 mm × 120 mm provided with openings 22 having a pattern of d = 12 mm, e = 6 mm, f = 13 mm, and g = 13 mm. In use, the substrate 15 is placed on the substrate 15 from above the electrode 1, and the substrate 15 is set in a vacuum vapor deposition apparatus. Under reduced pressure of 5 × 10 ⁻⁵ Pa, 4,4′-bis [N- (naphthyl) is used. ) -N-phenyl-amino] biphenyl (α-NPD) is deposited to a thickness of 800 mm at a deposition rate of 1 kg / s to form a hole transport layer, and then a dinaphthylanthracene derivative (manufactured by Kodak Co., Ltd.) as a blue light-emitting layer. A light emitting layer is provided by laminating a layer of 4% by mass of “BH-2”) with 4% by mass of a distyrylarylene derivative, and then a bathocproin (manufactured by Dojin Chemical Laboratory) and Cs in a molar ratio of 1: 1 Provided an organic light-emitting layer 3 and an electron injection layer were co-deposited to 200Å thick.

  Further, as shown in FIG. 8B, a mask 25 having a size of 120 mm × 120 mm provided with openings 24 having a pattern of h = 10 mm, i = 10 mm, j = 15 mm, and k = 10 mm is used. In the state where the mask 25 is superimposed on the substrate 15 from above the organic light emitting layer 3, similarly, aluminum is vacuum-deposited to a thickness of 800 mm at a film forming rate of 4 mm / s to form a cathode (electrode 2). As shown to b), the organic electroluminescent element 4 in which the light emission part 26 of 1 cm x 1 cm paralleled was obtained.

  On the other hand, as the sealing member A, the sealing plate 8 shown in FIG. 9A and the joining member 9 shown in FIG. 9B were used. The sealing plate 8 is formed of a glass plate of 98 mm × 98 m × thickness 1 mm, and Cr is sputtered to a thickness of 2200 mm on one side to assist the pattern of l = 5 mm, m = 15 mm, n = 4 mm, o = 9 mm. An electrode 5 is provided. At the portion where the auxiliary electrode 5 reaches the side edge of the glass plate, Cr is sputtered to a thickness of 2200 mm on the side edge surface of the glass plate to form an external electrode. On the surface of the auxiliary electrode 5, conductive portions 6 are provided in a 5 × 5 arrangement by crimping Au balls at intervals of p = 20 mm and q = 19 mm. The joining member 9 is formed of glass having an outer dimension of 98 mm × 98 mm, an inner dimension of 96 mm × 96 mm, and a thickness of 0.3 mm.

  Then, the sealing plate 8 is stacked on the organic electroluminescent element 4 via the bonding member 9, and the bonding member 9 is bonded to the substrate 15 of the organic electroluminescent element 4 using an organic EL sealing material “30Y-437” manufactured by ThreeBond. The organic light emitting layer 3 was sealed by adhering to the sealing plate 8.

(Example 2)
The auxiliary electrode 5 is formed by drawing a silver paste on the sealing plate 8 to a width of 1 mm and a thickness of 300 μm, and the conductive part 6 is formed by laminating a silver paste on the surface of the auxiliary electrode 5 to a thickness of 200 μm. I tried to do it. In the same manner as in Example 1, the external electrode was formed by applying silver paste to the side end surface of the glass plate at the portion where the auxiliary electrode 5 reached the side end of the glass plate. Other than this, the organic light emitting layer 3 of the organic electroluminescent element 4 was sealed in the same manner as in Example 1.

(Example 3)
As the sealing member A, a sealing plate 8 shown in FIGS. 10A and 10B and a joining member 9 shown in FIG. 10C were used. The sealing plate 8 is formed of a glass plate of 100 mm × 100 m × thickness 1 mm, and each side of the four circumferences is polished at an angle of 45 ° to form a slope 19. The auxiliary electrode 5 was formed by sputtering Cr to a thickness of 6000 mm in a range including the inclined surface 19, and the conductive portion 6 was formed by attaching a 1 mm × 1 mm × 0.6 mm thick carbon tape. The joining member 9 is formed of glass having an outer dimension of 100 mm × 100 mm, an inner dimension of 96 mm × 96 mm, and a thickness of 0.3 mm.

  The organic light emitting layer 3 of the organic electroluminescent element 4 was sealed in the same manner as in Example 1 except that this sealing member A was used.

(Comparative Example 1)
The organic light emitting layer 3 of the organic electroluminescent element 4 was sealed in the same manner as in Example 1 except that the sealing member A without the conducting portion 6 was used.

(Comparative Example 2)
The organic light emitting layer 3 of the organic electroluminescent element 4 was sealed in the same manner as in Example 2 except that the sealing member A without the conducting portion 6 was used.

  About the organic electroluminescent element 4 sealed by Examples 1-2 and Comparative Examples 1-2 as mentioned above, it supplied with electricity to the electrodes 1 and 2 only from the one side of the board | substrate 15, respectively. Then, when energized at 100 mA / pixel, in the column closest to the cathode (electrode 2), the pixel closest to the anode (electrode 1) feeding portion (light emitting portion 26) and the farthest pixel (light emitting portion 26) The driving voltage was measured. The results are shown in Table 1.

  Further, in Example 3, although the size of the substrate 15 of the organic electroluminescent element 4 and the size of the sealing plate 8 of the sealing member A are the same, the wiring is conducted at the slope 19 portion. I was able to. In the case where the sealing plate 8 is not provided with the inclined surface 19 and the substrate 15 of the organic electroluminescent element 4 and the sealing plate 8 having the same size are used for the same sealing, conduction cannot be obtained. It was a thing.

  As can be seen in Table 1, it is confirmed that each of the examples can be driven with the same driving voltage regardless of the distance from the power feeding unit.

It is a partial sectional view showing an example of an embodiment of the invention. It is an exploded perspective view same as the above. Another example of embodiment of this invention is shown, (a), (b) is a partial sectional view, respectively. It is sectional drawing which shows another example of embodiment of this invention. It is a partial sectional view showing other examples of an embodiment of the invention. It is a partial sectional view showing other examples of an embodiment of the invention. (A) is a top view which shows the board | substrate with an electrode used in the Example, (b) is a top view which shows the organic electroluminescent element used in the Example. (A), (b) is a top view which shows the mask used in the Example. (A) is a top view which shows the sealing board used in the Example, (b) is a top view which shows the joining member used in the Example. (A), (b) is the top view and front view which show the sealing board used in the Example, (c) is a top view which shows the joining member used in the Example.

Explanation of symbols

A sealing member 1 electrode 2 electrode 3 organic light emitting layer 4 organic electroluminescent element 5 auxiliary electrode 6 conducting portion 7 external electrode 8 sealing plate 9 bonding member 10 thin portion

Claims (5)

  A sealing member for sealing an organic light emitting layer of an organic electroluminescent element formed by providing an organic light emitting layer between two electrodes. The sealing member includes an auxiliary electrode and an auxiliary electrode. An organic electroluminescent device comprising: a conductive portion that is connected to face the electrode of the organic electroluminescent device so as to be connectable; and an external electrode that is connected to the auxiliary electrode and exposed to the outer surface of the sealing member. Sealing member.   The sealing member is bonded between the organic electroluminescent device and the sealing plate at a position surrounding the organic light emitting layer, and a sealing plate having an auxiliary electrode disposed facing the organic light emitting layer of the organic electroluminescent device. The organic electroluminescent element sealing member according to claim 1, wherein the organic electroluminescent element sealing member is formed with a possible joining member.   At least a part of the thickness of the end of the sealing plate is made thinner than other parts, external electrodes are provided on the thin part of the sealing plate, and the bonding member is bonded to the thick part of the sealing plate The organic electroluminescent element sealing member according to claim 2, wherein the sealing member is an organic electroluminescent element.   The organic electroluminescent element sealing member according to any one of claims 1 to 3, wherein the conducting portion is provided so as to protrude from the surface of the sealing member. In the organic electroluminescent element formed by providing an organic light emitting layer between two electrodes, the sealing member according to any one of claims 1 to 4 is bonded so as to seal the organic light emitting layer. An organic electroluminescent element characterized by the above.

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