WO2013118510A1 - 有機エレクトロルミネッセンス発光装置及びその製造方法 - Google Patents
有機エレクトロルミネッセンス発光装置及びその製造方法 Download PDFInfo
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- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
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- H10K50/854—Arrangements for extracting light from the devices comprising scattering means
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- H10K50/80—Constructional details
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- H10K50/842—Containers
- H10K50/8426—Peripheral sealing arrangements, e.g. adhesives, sealants
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- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
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- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/86—Series electrical configurations of multiple OLEDs
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- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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- H10K2102/301—Details of OLEDs
- H10K2102/302—Details of OLEDs of OLED structures
- H10K2102/3023—Direction of light emission
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- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
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- H10K50/846—Passivation; Containers; Encapsulations comprising getter material or desiccants
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- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
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- H10K77/10—Substrates, e.g. flexible substrates
Definitions
- the present invention relates to an organic electroluminescence light emitting device using an organic electroluminescence element and a method for producing the same.
- organic electroluminescence elements (hereinafter also referred to as “organic EL elements”) have been applied to applications such as lighting panels.
- a translucent first electrode (anode), a light emitting functional layer composed of a plurality of layers including a light emitting layer, and a second electrode (cathode) are arranged in this order. Those formed by laminating on the surface are known.
- An organic electroluminescence light emitting device (hereinafter also referred to as “organic EL light emitting device”) is obtained by sealing an organic EL element which is a light emitting element as described above with an appropriate sealing material.
- the amount of light emitted from the light emitting layer is reduced by absorption at the substrate or total reflection at the interface of the layer, so that the amount of light extracted outside is less than the theoretical light emission amount. . For this reason, increasing the light extraction efficiency of the organic EL element to increase the brightness is one of the problems.
- Patent Documents 1 and 2 disclose a lighting device in which a plurality of organic EL elements are arranged.
- the organic EL light emitting device it is important to prevent moisture and oxygen from entering the inside. If moisture or oxygen enters the inside of the sealing region, the organic EL element is deteriorated, causing light emission failure and the like, and reducing the reliability of the organic EL light emitting device. In particular, when an organic EL light emitting device is formed using a material such as plastic that has a relatively high moisture and oxygen permeability, penetration into the inside through this material becomes a problem.
- an organic EL light emitting device having a structure in which a plurality of organic EL elements are connected, light emission is weakened by forming a non-light emitting region by forming a gap at the connecting portion or making light difficult to reach. There is a fear. For this reason, the uniformity of in-plane light emission may be reduced, or the overall light emission luminance may be reduced, and it is required to obtain more intense light and more natural light emission.
- the present invention has been made in view of the above circumstances, and provides an organic electroluminescence light-emitting device having high light extraction properties and a method for producing the same while suppressing moisture and oxygen from entering the inside and reducing deterioration.
- the purpose is to do.
- the organic electroluminescence light emitting device includes a translucent first electrode, a light emitting functional layer including a plurality of layers including a light emitting layer, and a second electrode in this order on the surface of the translucent substrate.
- An organic electroluminescence light-emitting device comprising the organic electroluminescence element according to claim 1, wherein the resin composition comprises a scatterer having at least one of a hygroscopic property and an oxygen-absorbing property on at least a part of a side surface of the translucent substrate.
- the functional scattering portion formed by the above is provided in contact with each other.
- the functional scattering portion contains a toning pigment that adjusts the light emitted from the side surface of the translucent substrate. It is.
- the toning pigment is a pigment that whitens light emitted from the side surface of the translucent substrate.
- the toning dye contains at least a blue pigment.
- a plurality of the organic electroluminescence elements are arranged in a direction perpendicular to the stacking direction, and between the translucent substrates in the adjacent organic electroluminescence elements, It is a preferable embodiment that the functional scattering portion is formed.
- the translucent substrate includes a glass substrate and a plastic layer formed on at least a part of the surface of the glass substrate, and the functional scattering unit. Is a preferred embodiment in contact with the side surface of the plastic layer.
- a translucent first electrode, a light emitting functional layer composed of a plurality of layers including a light emitting layer, and a second electrode are translucent in this order.
- a resin composition containing a scatterer between an arranging step of arranging a plurality of organic electroluminescence elements on the surface of the substrate side by side on the surface of the supporting base material and the translucent substrate in the adjacent organic electroluminescence elements It manufactures by the process which has the filling process which fills a thing, and the hardening process which hardens the said resin composition.
- the scatterer has at least one of hygroscopicity and oxygen absorption.
- the resin composition contains a thermosetting resin
- the curing step is a step of heating and curing the resin composition. Is a preferred form.
- the resin composition contains an ultraviolet curable resin
- the curing step is a step of curing by irradiating the resin composition with ultraviolet rays. It is a preferable form.
- the functional scattering portion by providing the functional scattering portion, it is possible to suppress the moisture and oxygen from entering the inside and reduce the deterioration, and to obtain an organic electroluminescence light emitting device having a high light extraction property.
- FIG. 1 is an example of an embodiment of an organic electroluminescence light emitting device (organic EL light emitting device).
- the organic EL light emitting device includes at least one organic electroluminescence element (organic EL element) 10.
- the organic EL element 10 has a light-transmitting first electrode 2, a light-emitting functional layer 3 composed of a plurality of layers including a light-emitting layer, and a second electrode 4 in this order on the surface of the light-transmitting substrate 1. It is what you have.
- the organic EL light emitting device includes a plurality of organic electroluminescence elements 10.
- the organic EL light-emitting device may be one in which a plurality of organic EL elements 10 are arranged vertically and horizontally in a plane perpendicular to the stacking direction. Arranging a plurality of organic EL elements 10 (tiling) increases the area of the light emitting region, so that light can be obtained in a large area and light can be obtained with stronger intensity. Therefore, it becomes useful as a lighting device, particularly a panel lighting body.
- an organic EL light-emitting device in which a plurality of organic EL elements 10 are arranged in one direction and arranged in a line rather than a plane may be used.
- the first electrode 2 usually constitutes an anode and the second electrode 4 constitutes a cathode, but the opposite may be possible.
- the second electrode 4 may have light reflectivity. In that case, light from the light emitting layer emitted toward the second electrode 4 side can be reflected by the second electrode 4 and extracted from the translucent substrate 1 side.
- the light emitting functional layer 3 is a layer having a function of causing light emission, and includes a plurality of layers appropriately selected from a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer, an intermediate layer, and the like. Is.
- the translucent substrate 1 has a plastic layer 12 on the substrate surface.
- the translucent substrate 1 includes a glass substrate 11 and a plastic layer 12 formed on the surface of the glass substrate 11 on the organic EL element 10 side.
- the plastic layer 12 may be formed on the entire surface of the glass substrate 11, or may be formed on at least a part of the surface of the glass substrate 11.
- the plastic layer 12 may be provided in a region where the first electrode 2 and the light emitting functional layer 3 are stacked (a light emitter stacking region).
- the translucent substrate 1 may be formed as a so-called composite base material.
- the plastic layer 12 can be formed as a layer in which a molded body (a sheet, a film, or the like) obtained by molding and curing a synthetic resin as a plastic raw material is bonded to the glass substrate 11.
- a layer formed of a plastic material such as PET (polyethylene terephthalate) or PEN (polyethylene naphthalate) can be used.
- the plastic layer 12 can also be formed by applying and curing a resin on the glass substrate 11. As the resin to be applied and cured, epoxy-based, acrylic-based heat curing, or ultraviolet curable resin can be used.
- the difference in refractive index between the glass substrate 11 and the first electrode 2 can be relaxed, and the light extraction property can be improved. That is, light emitted from the light emitting layer reaches the substrate directly or reflected, but if the difference in refractive index at this interface is large, there is a possibility that a large amount of light cannot be extracted by total reflection. Therefore, when the plastic layer 12 is inserted between the glass substrate 11 and the first electrode 2, the total reflected light can be reduced and the light extraction performance can be improved. For example, by providing a plastic layer 12 having a refractive index between the glass substrate 11 and the first electrode 2, the difference in refractive index can be reduced to reduce the total reflected light and improve the light extraction performance. . Alternatively, when the plastic layer 12 having a function of scattering light is provided on the surface of the glass substrate 11, the light reaching the surface of the translucent substrate 1 is scattered by the plastic layer 12 and total reflection is suppressed. Can be taken out more.
- the light transmissive substrate 1 may be provided with a light extraction structure between the glass substrate 11 and the plastic layer 12 to enhance the light extraction property. Thereby, the light extraction property can be further enhanced.
- the light extraction structure can be formed by providing an uneven structure on the surface of the glass substrate 11 or providing a light scattering layer containing a light scattering material. Further, a light extraction portion such as a light scattering layer may be further provided on the outer surface of the translucent substrate 1.
- a laminate composed of the first electrode 2, the light emitting functional layer 3, and the second electrode 4 is sealed with a protective base material 7 facing the translucent substrate 1.
- the protective base material 7 can be comprised with a base material which cannot permeate
- the protective base material 7 is bonded to the translucent substrate 1 with a resin sealing material 8, and a sealing space 9 is provided inside a region (sealing region) sealed with the protective base material 7. .
- a desiccant may be provided in the sealing space 9. Thereby, even if moisture permeates the sealed space 9, the moisture can be absorbed by the desiccant. Further, the sealing space 9 may be filled with a sealing filler.
- a plurality of organic EL elements 10 are fixed to a support base material 15 disposed on the side opposite to the translucent substrate 1.
- a plurality of organic EL elements 10 can be easily arranged and arranged in a planar shape or a linear shape. Further, the physical strength of the organic EL light emitting device can be increased by the support base material 15.
- a base material having high immobilization strength such as a metal plate or a resin plate can be used.
- the organic EL element 10 may be fixed by an appropriate method selected from bonding with an adhesive, double-sided tape, etc., fixing such as screwing or fitting.
- An inter-element space 13 is formed between the plurality of organic EL elements 10 as a space sandwiched between the support base material 15 and the translucent base material 1.
- the support base material 15 is provided with an electrical wiring 14 that enters from the outside of the light emitting device.
- each electrode pad (1st electrode pad and 2nd electrode pad) which conducts with each electrode of the 1st electrode 2 and the 2nd electrode 4 is provided in the surface edge part by the side of the 1st electrode 2 in the translucent board
- the electric wiring 14 which entered the inside of the apparatus is connected to each electrode pad so that plus (anode) and minus (cathode) correspond.
- the electrode pad is formed to extend from the inside of the region (sealed region) sealed by the protective base material 7 to the outside. That is, the electrode pad may be provided on the surface of the plastic layer 12 in the region of the inter-element space 9. In FIG.
- the electrical wiring 14 may be fixed to the electrical pad or the support member 15 by an appropriate material such as solder or a cured resin. Then, by applying a voltage to the first electrode 2 and the second electrode 4 through the electrical wiring 14 and the electrode pad, holes and electrons are combined in the light emitting layer in the light emitting functional layer 3 to generate light emission. Can be made.
- the organic EL light-emitting device of this embodiment functional scattering formed by a resin composition containing a scatterer 6 having at least one of hygroscopicity and oxygen-absorbing property on at least a part of the side surface of the translucent substrate 1.
- the part 5 is provided in contact.
- an organic EL light-emitting device including a plurality of organic EL elements 10 the organic EL elements 10 arranged at the end portions are arranged on the side portions of the outer end portions of the translucent substrate 1.
- An end-side functional scattering portion 5 a is provided so as to cover the entire side surface of the translucent substrate 1.
- the functional scattering portion 5 a on the end side contacts and adheres to the side surface of the translucent substrate 1, and contacts and adheres to the support member 15.
- the functional scattering portion 5a on the end side may be provided so as to surround the plurality of organic EL elements 10 at the end of the organic EL light emitting device. And the side surface of the edge part of the translucent board
- the functional scattering portion 5 is formed as the functional scattering portion 5b between the elements between the translucent substrates 1 in the adjacent organic EL elements 10 and 10. That is, the functional scattering portion 5b between the elements is provided so as to fill a gap between the translucent substrates 1 and 1. It can be said that the functional scattering portion 5b between the elements is provided in contact with the side surface of the translucent substrate 1 at the side portion of the translucent substrate 1.
- the functional scattering part 5b between the elements is between the translucent substrates 1 including the range from one surface of the translucent substrate 1 to the other surface between the adjacent translucent substrates 1 and 1. It is provided in the entire gap.
- the range in which the functional scattering portion 5b between the elements is provided may be a part of the gap between the translucent substrates 1 and 1 (a part of the range in the stacking direction). In that case, it is preferable to provide the functional scattering part 5b between the elements at least outside the plastic layer 12 in the stacking direction. Accordingly, the gap between the translucent substrates 1 and 1 can be filled by the functional scattering portion 5b between the elements, so that the external space is not communicated with the internal inter-element space 13, and the plastic layer 12 is blocked from the outside. In addition, it is possible to shield moisture by the resin sealing material 8. Thus, the penetration of moisture and oxygen into the sealed space 9 can be suppressed by the functional scattering portion 5 b and the resin sealing material 8. In the form of FIG.
- the functional scattering portion 5b between the elements is such that the resin composition filled in the gap overflows to the outer surface of the translucent substrate 1 and enters the gap between the translucent substrates 1 and 1. It is also formed on the outer surface of the glass substrate 11 so as to cover it. Thereby, more functional scattering portions 5 can be provided at the boundary portion of the organic EL element 10.
- the plastic layer 12 is not exposed to the outside and is blocked from the outside by providing the functional scattering portion 5.
- the outer end of the plastic layer 12 disposed at the end of the light emitting device is blocked from the outside by the functional scattering portion 5a on the end.
- the edge part of the plastic layer 12 in the inside of a light-emitting device is interrupted
- the functional scattering part 5 contains the scatterer 6 which has at least one of a hygroscopic property and oxygen absorption property, even if a water
- the functional scattering part 5 contains the scatterer 6 which has the function to scatter light. Therefore, the light propagating inside the translucent substrate 1 can be scattered by the functional scattering portion 5 and extracted to the outside, and the light extraction property can be improved.
- the light generated in the light emitting layer is extracted to the outside through the translucent substrate 1, but there is light that enters at an inclined angle with respect to the translucent substrate 1.
- a predetermined angle critical angle
- total reflection occurs and propagates in the translucent substrate 1 to become guided light.
- some of the light is emitted to the outside through the translucent substrate 1 and is visually recognized, but the remaining light is emitted laterally from the side surface of the translucent substrate 1, It cannot be taken out in the viewing direction. For this reason, in the conventional organic EL light emitting device, the light extraction performance is degraded.
- the guided light propagating through the translucent substrate 1 enters the functional scattering unit 5 disposed on the side of the translucent substrate 1, and this functional scattering unit 5.
- the light travel direction changes and is extracted in the viewing direction. Therefore, the light extraction property can be improved.
- the guided light reaching the end portion of the organic EL light emitting device can be scattered and taken out to the outside, so that the emission intensity can be increased.
- the functional scattering part 5b between elements since the guided light which reached
- a non-light emitting region is formed in the connecting portion.
- connection portion looks like a non-light-emitting frame around the light emitting region, there is a problem that the appearance of the organic EL element 10 is deteriorated when the organic EL element 10 is tiled to form a large screen. Further, when considered as surface emitting illumination, there is a problem that luminance uniformity and total luminous flux are lowered when there is a non-light emitting region.
- the functional scattering portion 5b between the elements is formed at the connection portion of the organic EL elements 10, so that light can be extracted to the outside at the connection portion. .
- the non-light emitting region between the elements can not be formed, or the non-light emitting region can be reduced, and the gap between the elements can be made inconspicuous. Therefore, more uniform light emission can be achieved in the plane, and more natural surface light emission can be obtained. Further, since the non-light emitting region can be converted into the light emitting region, the light emission intensity as a whole can be further increased.
- the functional scattering part 5b between elements is extended and provided in the vicinity of the position corresponding to the position in which the resin sealing material 8 is provided in the surface of the outer side of the translucent board
- the scatterer 6 silica gel, desiccite, or the like can be used. Since these are water-absorbing and have good dispersibility in the resin composition, the functional scattering portion 5 can be easily formed. Further, as the oxygen-absorbing scatterer, AGELESS (manufactured by Mitsubishi Gas Chemical), Everfresh (manufactured by Torisu Sangyo), or the like can be used. Note that both the water-absorbing scatterer 6 and the oxygen-absorbing scatterer 6 may be used in combination. Moreover, you may use the scatterer 6 which has the function of both water absorption and oxygen absorption.
- the functional scattering portion 5 contains a toning pigment for toning light emitted from the side surface of the translucent substrate 1.
- the functional scattering unit 5 includes a toning pigment that approximates the color of light emitted from the surface of the translucent substrate 1 to the color of light emitted from the side surface.
- the color of light emitted from the surface of the translucent substrate 1 is white, the color of light emitted from the side surface may not be white. This is because only light in a specific wavelength range out of light propagating through the translucent substrate 1 propagates without being attenuated by interference and is emitted from the side surface of the translucent substrate 1.
- the toning pigment is preferably a pigment that whitens light emitted from the side surface of the translucent substrate 1.
- substrate 1 can be whitened, and can be made not conspicuous, and an organic electroluminescent light-emitting device can be used suitably for an illumination use.
- the color of light emitted from the surface of the translucent substrate 1 is white
- the color of light emitted from the side surface may be green or light red. Therefore, in such a case, it is preferable that the toning dye contains at least a blue pigment.
- substrate 1 can be whitened, and can be made not conspicuous.
- a red pigment is included in addition to the blue pigment.
- the color of the emitted light is red, it is preferable that a green pigment is included in addition to the blue pigment.
- substrate 1 can be whitened, and it can be made not conspicuous, and an organic electroluminescent light-emitting device can be used more suitably for an illumination use.
- the organic EL element 10 includes the light-transmitting first electrode 2, the light-emitting functional layer 3 including a plurality of layers including the light-emitting layer, and the second electrode 4. What has in order on the surface of the translucent board
- substrate 1 can be used.
- a resin composition containing the scatterer 6 is filled between the translucent substrates 1 in the adjacent organic EL elements 10. This is the filling process.
- the resin composition can be filled by applying a paste-like resin composition from the outer surface to fill the gap. At this time, if the resin composition overflows from the gap, the functional scattering portion 5 can be easily formed on the surface of the glass substrate 11. Further, when the gap is filled with the resin composition, the adjacent translucent substrates 1 and 1 can be bonded and connected, and the plurality of translucent substrates 1 are integrated into a planar shape. The fixing strength of the organic EL element 10 can be increased. By filling the resin composition between the translucent substrates 1, the inter-element space 13 between the organic EL elements 10 is closed to be a space isolated from the external space.
- the process which provides a resin composition in the edge part of a light-emitting device can be performed simultaneously with a filling process or a continuous with a filling process.
- the resin composition containing the scatterer 6 can be applied and provided on the surface of the support base 15 at the side of the organic EL element 10 disposed at the end.
- the resin composition is provided so as to be in contact with the side surface of the outer end portion of the translucent substrate 1 so as to cover the side surface, the space at the end portion of the organic EL light emitting device is sealed.
- the interspace 13 can be formed as a closed space.
- the resin is cured and the functional scattering part 5 in which the scatterers 6 are dispersed can be formed.
- the resin composition provided in the side part of the outer side of the organic EL element 10 by which the functional scattering part 5b between elements was formed from the resin composition filled between the translucent substrates 1, and was arrange
- the functional scattering portion 5a on the end side is formed.
- the scatterer 6 is applicable also to what does not have water absorption and oxygen absorption. Even when the scatterer 6 does not have water absorption and oxygen absorption, the light extraction property can be improved by forming the functional scattering portion 5 in the gap formed in the connection portion between the elements. Also, the light emission can be made more natural. However, when the scatterer 6 has at least one of hygroscopicity and oxygen absorption, moisture and oxygen are prevented from entering the inside, and a moistureproof effect and an oxygenproof effect are obtained. It is preferable to use a scatterer 6 having at least one of the following.
- the resin composition a resin composition containing a thermosetting resin or a resin composition containing an ultraviolet curable resin can be used. Thereby, the functional scattering part 5 can be formed by easily curing the resin composition.
- the curing process can be a process of heating and curing the resin composition.
- the heating temperature at this time is preferably lower than the heat resistance temperature of the plastic layer 12. If the heating temperature is too high, the plastic layer 12 may melt.
- the resin composition may contain appropriate additive substances such as a curing agent and a curing accelerator.
- An epoxy resin or the like can be used as the thermosetting resin, but is not limited thereto.
- the curing step can be a step of curing the resin composition by irradiating with ultraviolet rays.
- a UV lamp or the like can be used as the ultraviolet irradiation.
- the resin composition may contain appropriate additive substances such as a polymerization initiator and a polymerization accelerator.
- An acrylic resin or the like can be used as the ultraviolet curable resin, but is not limited thereto.
- an organic EL light emitting device in which a plurality of organic EL elements 10 are tiled in a planar shape as shown in FIG. 1 is obtained.
- work to connect the electrical wiring 14 before a filling process as long as it can connect to an appropriate site
- the organic EL light-emitting device obtained in this manner is excellent in moisture resistance and oxygen resistance and also has excellent light extraction properties.
- FIG. 2 shows another example of the embodiment of the organic EL light emitting device. The same components as those in the embodiment of FIG.
- the functional scattering part 5 does not cover the entire side part of the translucent substrate 1 but is provided in a part of the side part of the translucent substrate 1. And is different.
- Other configurations are the same as the configuration of FIG.
- the transparent portion 1 is arranged on the side portion of the organic EL element 10 arranged at the end portion on the outer end side of the translucent substrate 1.
- An end-side functional scattering portion 5 a is provided so as to cover a part of the side surface of the optical substrate 1.
- the functional scattering portion 5 a on the end side contacts and adheres to a part of the side surface of the translucent substrate 1 and contacts and adheres to the support member 15.
- the functional scattering portion 5 a on the end side covers the entire side surface of the plastic layer 12 and a part of the side surface of the glass substrate 11.
- the functional scattering portion 5a on the end portion side is in contact with the support member 15, the outer side of the organic EL element 10 disposed on the end portion is supported by the functional scattering portion 5a on the end portion side. It is blocked. For this reason, the outer end portion of the plastic layer 12 of the organic EL element 10 disposed at the end portion is blocked from the outside and does not communicate with the external space.
- the functional scattering portion 5b between the elements is provided so as to fill the gap between the adjacent translucent substrates 1 and 1 from the outer surface. It can be said that the functional scattering portion 5b between the elements is provided in contact with a part of the side surface of the translucent substrate 1 at the side portion of the translucent substrate 1. In this embodiment, the functional scattering part 5b between the elements is in contact with a part of the side surface of the plastic layer 12. And the functional scattering part 5b between elements is provided so that the part outside the plastic layer 12 may be embedded in the lamination direction.
- the gap between the translucent substrates 1 is filled by the functional scattering portion 5b between the elements, and the external space is not communicated with the inter-element space 13 inside the device, and the end portion of the plastic layer 12 inside the light emitting device. Can be shut off from the outside.
- the functional scattering portion 5 b between the elements is such that the resin composition filled in the gap overflows to the outer surface of the translucent substrate 1, and in the gap between the translucent substrates 1 and 1. It is also formed on the outer surface of the glass substrate 11 so as to cover it. Thereby, more functional scattering portions 5 can be provided at the boundary portion of the organic EL element 10.
- the plastic layer 12 since the plastic layer 12 is not exposed to the outside, it is possible to prevent moisture and oxygen from entering the inside through the plastic layer 12. Therefore, it is possible to reduce deterioration of the element due to moisture or oxygen entering the inside.
- the guided light in the translucent substrate 1 enters the functional scattering unit 5, is scattered by the scatterer 6, and is extracted outside. Therefore, the light extraction property can be improved and the gaps between the elements can be made inconspicuous, so that the light emission intensity can be increased and natural light emission can be obtained.
- FIG. 3 shows another example of the embodiment of the organic EL light emitting device. The same components as those in the embodiment of FIG.
- the translucent substrate 1 does not have the plastic layer 12 and is formed of the glass substrate 11.
- Other configurations are the same as the configuration of FIG.
- the problem of moisture or oxygen permeating from the plastic layer 12 does not occur.
- the gap between the end portion of the organic EL light emitting device and the organic EL element 10 is opened to the outside, and the inter-element space 13 and the external space communicate with each other, moisture and oxygen enter the element. It becomes easy. Moisture and oxygen easily enter the organic EL element 10 through, for example, the resin sealing material 8 and the interface between the electrode pads.
- the functional scattering portion 5 is provided so as to block the inter-element space 13, the inter-element space 13 does not communicate with the external space, so that moisture and oxygen are prevented from entering the inside. be able to.
- the functional scattering portion 5 on the side portion of the translucent substrate 1, the guided light in the translucent substrate 1 can be extracted to the outside. Therefore, the light extraction property can be improved and the gaps between the elements can be made inconspicuous, so that the light emission intensity can be increased and natural light emission can be obtained.
- FIG. 5 shows another example of the embodiment of the organic EL light emitting device. The same components as those in the embodiment of FIG.
- the translucent substrate 1 is formed of a glass substrate 11 and the optical film 16 is bonded to the outer surface of the translucent substrate 1. is there.
- Other configurations are the same as the configuration of FIG.
- the light extraction efficiency can be increased by the optical film 16, but as such an optical film 16, for example, a microlens, a lens shape such as a pyramid structure, and fine particles are dispersed.
- a film having scattering properties can be used.
- the optical film 16 may be bonded to the translucent substrate 1 after the resin composition that forms the functional scattering portion 5 is cured. In this case, there is no concern that the optical film 16 melts due to the curing temperature of the resin composition, the appearance of the lighting device is improved, and the yield is increased.
- the form of FIG.2, FIG3 and FIG.5 can be manufactured by the method similar to the manufacturing method demonstrated in the form of FIG. That is, the functional scattering part 5 can be formed by filling the resin composition in the gap between the translucent substrates 1 and 1 in the organic EL element 10. 1 and 2, the inter-element space 13 and the external space are not communicated with each other by the functional scattering portion 5 similarly to the embodiment of FIG. It is possible to suppress the entry of moisture and oxygen through the like. However, in the embodiment of FIGS. 1 and 2, it is more important to prevent moisture and oxygen from entering through the plastic layer 12.
- FIG. 4 shows another example of the embodiment of the organic EL light emitting device. The same components as those in the embodiment of FIG.
- the 4 is an organic EL light-emitting device including one organic EL element 10. That is, this organic EL light emitting device is constituted by one organic EL element 10, and no gap is provided between the elements.
- the functional scattering unit 5 is entirely composed of the functional scattering unit 5a on the end side.
- the inter-element space 13 is not a space between the elements, but is formed as a device end space 13a.
- the functional scattering part 5 is provided in the side part of the edge part of the translucent board
- the functional scattering portion 5 is bonded in contact with the side surface of the translucent substrate 1 and is bonded in contact with the support member 15.
- the functional scattering unit 5 may be provided so as to surround the organic EL element 10 at the end of the organic EL light emitting device. And by being surrounded by the functional scattering part 5, in the edge part of the translucent board
- the resin sealing material 8 can also block moisture.
- the penetration of moisture and oxygen into the sealed space 9 can be suppressed by the functional scattering portion 5 and the resin sealing material 8. Therefore, it is possible to reduce deterioration of the element due to moisture and oxygen.
- the guided light in the translucent substrate 1 enters the functional scattering unit 5, is scattered by the scatterer 6, and is extracted outside. Therefore, the light extraction property can be improved, so that the emission intensity can be increased.
Abstract
Description
2 第1電極
3 発光機能層
4 第2電極
5 機能性散乱部
6 散乱体
7 保護基材
8 樹脂封止材
9 封止空間
10 有機エレクトロルミネッセンス素子
11 ガラス基板
12 プラスチック層
13 素子間空間
14 電気配線
15 支持基材
16 光学フィルム
Claims (10)
- 透光性の第1電極、発光層を含む複数の層により構成される発光機能層、及び、第2電極を、この順で透光性基板の表面に有する有機エレクトロルミネッセンス素子を備えた有機エレクトロルミネッセンス発光装置であって、
前記透光性基板の側面の少なくとも一部に、吸湿性及び吸酸素性の少なくとも一方を有する散乱体を含有する樹脂組成物によって形成された機能性散乱部が接触して設けられていることを特徴とする有機エレクトロルミネッセンス発光装置。 - 前記機能性散乱部には、前記透光性基板の側面から出射される光を調色する調色色素が含有されていることを特徴とする請求項1に記載の有機エレクトロルミネッセンス発光装置。
- 前記調色色素が、前記透光性基板の側面から出射される光を白色化する色素であることを特徴とする請求項2に記載の有機エレクトロルミネッセンス発光装置。
- 前記調色色素には、少なくとも青色顔料が含まれていることを特徴とする請求項2又は3に記載の有機エレクトロルミネッセンス発光装置。
- 複数の前記有機エレクトロルミネッセンス素子を積層方向と垂直な方向に配置して備え、
隣り合う前記有機エレクトロルミネッセンス素子における前記透光性基板の間に、前記機能性散乱部が形成されていることを特徴とする請求項1乃至4のいずれか一項に記載の有機エレクトロルミネッセンス発光装置。 - 前記透光性基板は、ガラス基板とこのガラス基板の表面の少なくとも一部に形成されたプラスチック層とから構成されており、
前記機能性散乱部は、前記プラスチック層の側面に接触していることを特徴とする請求項1乃至5のいずれか一項に記載の有機エレクトロルミネッセンス発光装置。 - 透光性の第1電極、発光層を含む複数の層により構成される発光機能層、及び、第2電極を、この順で透光性基板の表面に有する有機エレクトロルミネッセンス素子を、支持基材の表面に複数個並べて配置する配置工程と、
隣り合う前記有機エレクトロルミネッセンス素子における前記透光性基板の間に、散乱体を含有する樹脂組成物を充填する充填工程と、
前記樹脂組成物を硬化させる硬化工程と、を有する工程により製造することを特徴とする有機エレクトロルミネッセンス発光装置の製造方法。 - 前記散乱体は、吸湿性及び吸酸素性の少なくとも一方を有することを特徴とする請求項7に記載の有機エレクトロルミネッセンス発光装置の製造方法。
- 前記樹脂組成物は熱硬化性樹脂を含有するものであり、前記硬化工程は、前記樹脂組成物を加熱して硬化する工程であることを特徴とする請求項7又は8に記載の有機エレクトロルミネッセンス発光装置の製造方法。
- 前記樹脂組成物は紫外線硬化性樹脂を含有するものであり、前記硬化工程は、前記樹脂組成物に紫外線照射して硬化する工程であることを特徴とする請求項7又は8に記載の有機エレクトロルミネッセンス発光装置の製造方法。
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JP2016122501A (ja) * | 2014-12-24 | 2016-07-07 | パナソニックIpマネジメント株式会社 | 有機発光デバイスおよび有機表示装置 |
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