JPWO2015118919A1 - Organic electroluminescence lighting device - Google Patents

Abstract

An object of the present invention is to provide an organic EL lighting device that is capable of natural and supple movement, and has a rendering effect and decorativeness as an elegant object. The organic EL lighting device of the present invention has a flexible surface light emitter having an organic electroluminescence element on a resin substrate having a thickness of 3 to 50 μm and a function of supplying power, and at least one portion of the flexible surface light emitter is provided. And a supporting power supply member.

Description

  The present invention relates to an organic electroluminescence lighting device having a flexible surface light emitter including an organic electroluminescence element and power feeding means.

  2. Description of the Related Art In recent years, an illumination device using a planar light emitter using an organic electroluminescence element (hereinafter abbreviated as “organic EL element”) as a light source has attracted attention. An organic electroluminescence element generally has a configuration in which an organic layer including a light emitting layer (a thin film made of an organic compound including a light emitting organic compound) is sandwiched between an anode and a cathode, and emits light by supplying a current between the electrodes. It is an element that is used in various devices such as electric decorations, light sources for signs, light emitting posters, and lighting.

  In recent years, in lighting devices using organic electroluminescence elements, as a lighting device in a room, from the viewpoint of further enhancing the presentation and decoration, the three-dimensional effect or the sense of depth is exhibited with sufficient flexibility, and organic There is a need to expand into new fields of use that appeal to the stunning and decorative properties utilizing the characteristics of electroluminescent elements.

  In response to the above request, there is no specific description about the driving method in the lighting device using a flexible organic electroluminescence element, but by connecting both ends of the flexible organic electroluminescence element to a rotatable support structure member. An illumination device including an organic electroluminescence element capable of dynamically changing a curved shape is disclosed (for example, refer to Patent Document 1). However, the method disclosed in Patent Document 1 has a structure in which both ends of a rectangular organic electroluminescence element are firmly fixed by two supporting structure members, and the organic electroluminescence element is driven flexibly. This is difficult, and it is insufficient from the viewpoint of expressing performance or decoration by giving free movement.

  Also, an illumination mechanism is disclosed that includes a solid-state light emitting device disposed on the surface of a flexible substrate, and a part of the panel portion of the light emitting device includes a shape matching mechanism that can selectively bend the light emitting surface (for example, , See Patent Document 2). However, in the disclosed method, since at least two sides of the organic electroluminescent element are fixed by the support structure, the organic electroluminescent element is difficult to move flexibly. As a result, as a lighting device, It is extremely difficult to flutter and drift in a natural state, and as a result, it is a lighting device with a fixed shape, insufficient directing and decorativeness by expressing free movement, The lighting device is less attractive.

  On the other hand, a method using a thin resin substrate as a support substrate of an organic electroluminescence element is disclosed in Examples and the like (see, for example, Patent Documents 3 and 4). However, in these patent documents, there is no disclosure or mention as a lighting device that gives a stunning performance, design, or decorativeness by flexibly moving an organic electroluminescence element composed of a thin resin substrate.

  Further, a transparent conductive layer is formed on a resin substrate having a thickness in the range of 3 to 50 μm by using a conductive oxide fine particle, for example, ITO (indium tin oxide) by a coating method, A method for producing a flexible transparent conductive film and a functional element by applying a compression treatment, and an organic electroluminescence element to which the method is applied are disclosed (for example, see Patent Document 5). However, Patent Document 5 does not disclose or refer to a lighting device that expresses a supple operation and imparts stylistic performance, design, or decoration.

  In the conventional technology, there are no lighting devices with various shapes and flexible organic electroluminescence elements, and natural and supple movement characteristics. The appearance of an attractive lighting device is desired.

US Patent Application Publication No. 2013/0044487 Special table 2013-528897 gazette JP 2011-073417 A JP 2012-016854 A JP 2009-302029 A

  The present invention has been made in view of the above problems, and a solution to the problem is to provide a flexible surface light emitter having a thin film resin base material capable of natural and supple movement, and to produce as an elegant object. An organic electroluminescence lighting device having a property and a decorative property is provided.

  As a result of intensive studies in view of the above problems, the present inventor has a flexible surface light emitter having an organic electroluminescence element on a thin resin substrate, a function of supplying power, and the flexible surface light emitter. Flexible surface light emission capable of natural and supple movement with an organic electroluminescence lighting device characterized by comprising a power supply member that also serves as a support member and supplies power to the organic electroluminescence element in at least one place The present inventors have found that an organic electroluminescence lighting device having a body and providing stunning and decorative properties as an elegant object can be provided.

  That is, the said subject of this invention is solved by the following means.

  1. A flexible surface light emitter having an organic electroluminescent element on a resin substrate having a thickness in the range of 3 to 50 μm; and a power supply member that supplies power to the organic electroluminescent element, wherein the power supply member is the flexible surface An organic electroluminescence lighting device characterized by supporting at least one portion of a luminous body.

  2. 2. The organic electroluminescence lighting device according to item 1, wherein the organic electroluminescence element has a transparent anode mainly composed of silver and having a thickness in the range of 2 to 20 nm.

3. The organic electroluminescent lighting device according to item 1 or 2, wherein the flexible surface light emitter has a mass of 0.1 g / cm ² or less.

  4). The organic according to any one of claims 1 to 3, wherein the flexible surface light emitter and the power supply member are housed inside a cylindrical body having a transparent viewing part. Electroluminescence lighting device.

  5. The organic electroluminescent lighting device according to any one of claims 1 to 4, wherein the flexible surface light emitter is held by a guide wire and moves along the guide wire.

  6). The organic electroluminescent lighting device according to any one of claims 1 to 5, wherein the flexible surface light emitter is allowed to fly by an external means.

  7). The organic electroluminescence lighting device according to claim 6, wherein the external means for causing the flexible surface light emitter to fly is a blower or a drive motor.

  8). The organic electroluminescence illumination device according to any one of claims 1 to 7, wherein the organic electroluminescence element is disposed only at a tip portion of the flexible surface light emitter.

  9. The organic electroluminescence element according to any one of items 1 to 7, wherein the organic electroluminescence element is continuously or intermittently disposed on the entire surface of the flexible surface light emitter. Lighting device.

  10. The organic electroluminescence lighting device according to any one of items 1 to 9, wherein at least one of the organic electroluminescence elements emits white light.

  11. The organic electroluminescence illumination device according to any one of items 1 to 9, wherein at least one of the organic electroluminescence elements emits monochromatic or toned light in blue, green, or red. .

  12 The organic electroluminescence lighting device according to any one of claims 1 to 11, wherein the lighting device including the flexible surface light emitter and the power feeding member is attached to a stand or a wall surface. .

  13. The organic electroluminescence lighting device according to any one of claims 1 to 11, wherein the lighting device including the flexible surface light emitter and the power supply member is suspended from a ceiling.

  By the above means of the present invention, it is possible to provide an organic electroluminescence lighting device that includes a flexible surface light emitter capable of natural and supple movement, and has stunning and decorative properties as an elegant object.

  In the organic electroluminescence lighting device of the present invention (hereinafter also referred to as organic EL lighting device), a thickness of 3 is used as a base material constituting the organic EL element so that the organic EL element can move flexibly. By applying a thin resin substrate in a range of ˜50 μm, a highly flexible surface light emitter, and at least one portion of the surface light emitter is held and energized by a power supply member, While emitting light from a flexible surface light emitter, it can be freely swayed or drifted like a “hagoromo”, for example, as if it were “Hagoromo”. The decorativeness and grace as an object can be expressed.

Schematic which shows an example of the fundamental structure of the organic electroluminescent illuminating device which hold | maintained two places located on the diagonal of the surface emitting body which has flexibility with the electric power feeding member. The top view which shows an example of a structure of the organic electroluminescent illuminating device of this invention Sectional drawing which shows an example of a structure of the organic electroluminescent illuminating device of this invention Schematic sectional view showing an example of a basic configuration of a flexible surface light emitter applicable to the present invention Schematic diagram showing an example of the organic EL lighting device of the present invention having a guide wire Schematic diagram showing an example of the organic EL lighting device of the present invention housed inside a transparent cylinder Schematic which shows an example of the organic electroluminescent illuminating device which hold | maintained two points of the one edge parts of a flexible surface light-emitting body with the electric power feeding member. Schematic diagram showing an example of wearing a plurality of organic EL lighting devices of the present invention on a costume (T-shirt) Schematic sectional drawing which shows an example of a structure of the strip | belt-shaped flexible surface light-emitting body applicable to the organic electroluminescent illuminating device of this invention. Schematic sectional drawing which shows another example of a structure of the strip | belt-shaped flexible surface light-emitting body applicable to the organic electroluminescent illuminating device of this invention. Schematic sectional drawing which shows another example of a structure of the strip | belt-shaped flexible surface light-emitting body applicable to the organic electroluminescent illuminating device of this invention. Schematic diagram showing an example of the arrangement of organic EL elements in a flexible surface light emitter (overall arrangement) Schematic diagram showing another example of the arrangement of organic EL elements in a flexible surface light emitter (arranged only at the end) Schematic diagram showing another example of the arrangement of organic EL elements in a flexible surface light emitter (discontinuous arrangement) The schematic diagram which shows the example installed in the stand in an example of the installation method of the organic electroluminescent illuminating device of this invention The schematic diagram which shows the example installed in the wall surface in an example of the installation method of the organic electroluminescent illuminating device of this invention The schematic diagram which shows the example installed in the example of the installation method of the organic electroluminescent illuminating device of this invention, hanging from the ceiling Schematic sectional view showing an example of the configuration of a tandem organic EL element Schematic sectional view showing an example of the configuration of a toning type organic EL element

  The organic electroluminescence lighting device of the present invention includes a flexible surface light emitter having an organic electroluminescence element on a resin substrate having a thickness in the range of 3 to 50 μm, and a power feeding member that feeds the organic electroluminescence element. And having the power supply member support at least one of the flexible surface light emitters, thereby allowing the flexible surface light emitters to emit light while freely floating or drifting. It is possible to do. This feature is a technical feature common to the inventions according to claims 1 to 13.

  As an embodiment of the present invention, the organic electroluminescence element has a transparent anode having silver as a main component and having a thickness in the range of 2 to 20 nm from the viewpoint of further manifesting the effect of the present invention. Is a preferable aspect from the viewpoint of high emission uniformity and high light extraction efficiency and stable light emission.

Further, when the flexible surface light emitter has a mass of 0.1 g / cm ² or less, it is possible to express a more supple and natural movement only by applying a weak force such as an external means such as wind. .

  Moreover, by using the organic EL lighting device in which the flexible surface light emitter and the power supply member are housed in a cylindrical body having a transmissive appreciation part, it can be installed in various places, and the external environment A natural and supple movement is possible under desired conditions without being affected by wind or the like, and an organic EL lighting device having a stunning presentation and decoration as an elegant object can be realized.

  In addition, by holding the flexible surface light emitter with a guide wire and causing the surface light emitter to fly up and down by the external means along the guide wire, it can be used as a lighting device with more natural movement. This is a preferred embodiment from the viewpoint of producing a production effect and decorativeness and grace as an indoor object.

  In addition, in the organic EL lighting device of the present invention, the flexible surface light emitter is allowed to fly or drift by an external means, and further, the fan is driven using a blower or a drive motor as the external means. It is preferable to make it float from the viewpoint that the decorativeness and grace as an indoor object can be expressed more stably.

  In addition, the organic electroluminescence element may be configured to be disposed only at the distal end portion of the flexible surface light emitter, or to be configured to be continuously or intermittently disposed on the entire surface of the flexible surface light emitter. This is a preferable embodiment from the viewpoint of realizing a flexible surface light emitter having various types.

  In addition, it is preferable that one of the organic electroluminescence elements emits white light or emits blue, green, or red light because various indoor lighting can be realized in various situations.

  Hereinafter, the present invention, its components, and modes and modes for carrying out the present invention will be described in detail. In addition, "-" shown in the following description is used with the meaning which includes the numerical value described before and behind that as a lower limit and an upper limit. Moreover, in this invention, although the structure which has an organic electroluminescent element on the resin base material which exists in the range of 3-50 micrometers in thickness is made into a flexible surface light emitter, thickness is in the range of 3-50 micrometers for description. The resin base material inside may be described as a part of the constituent material of the organic electroluminescence element.

  Hereinafter, the specific configuration and function of the organic EL lighting device of the present invention will be described in detail with reference to the drawings.

<< Basic configuration of organic EL lighting device >>
The organic EL lighting device of the present invention has a flexible surface light emitter having an organic electroluminescence element on a resin substrate having a thickness in the range of 3 to 50 μm, and a power supply member that supplies power to the organic electroluminescence element. In addition, the power supply member is configured to support at least one portion of the flexible surface light emitter.

  FIG. 1 shows a basic configuration of an organic EL lighting device of the present invention in which two positions (joining positions P1 and P2 with a power supply member) located on a diagonal line of a flexible surface light emitter are held by a power supply member. It is the schematic which shows an example.

  In FIG. 1, an organic EL lighting device 1 includes a flexible surface light emitter 2 having an organic electroluminescent element on a resin substrate having a thickness in a range of 3 to 50 μm, and diagonal lines of the flexible surface light emitter 2. The power supply member 3 that supplies power to the electrodes that constitute the organic EL element is provided at two locations (bonding positions P1 and P2 with the power supply member 3). The power supply member 3 is necessary for light emission of the organic EL element. It has a role of supplying electric power, and a role of holding the surface light emitter 2 that is supple and can be fluttered and drifted like a robe.

  Next, a basic configuration of the flexible surface light emitter applied to the organic EL lighting device of the present invention will be described.

  FIG. 2A is a top view illustrating an example of the configuration of the flexible surface light emitter included in the organic EL lighting device of the present invention, and FIG. 2B illustrates the configuration of the flexible surface light emitter included in the organic EL lighting device of the present invention. It is sectional drawing which shows an example.

  In the top view shown in FIG. 2A, the organic EL lighting device 1 is a flexible surface emitting light that is formed on a thin resin substrate F by an organic EL element (ELD) including a transparent anode (not shown) and an extraction electrode 5. It is comprised by the electric power feeding member 3 provided in the joining positions P1 and P2 of the body 2 and the electric power feeding member.

  Electric power is supplied to the lead-out electrode portion 5 (transparent anode, not shown) of the organic EL element (ELD) constituting the flexible surface light emitter 2 through the conductive wire 4 connected to the power supply member 3. Further, the extraction electrode portion 5 and the conductive wire 4 are subjected to a sealing process by the sealing member 6 by an ultrasonic fusion method or the like.

  FIG. 2B is a cross-sectional view taken along the line AA of the organic EL lighting device 1 having the configuration shown in FIG. 2A.

  As shown in FIG. 2B, the flexible surface light emitter 2 constituting the organic EL lighting device 1 of the present invention has, for example, a resin base material F having a thickness in the range of 3 to 50 μm, which is a feature of the present invention. A transparent anode 51 containing silver as a main component and having a thickness in the range of 2 to 20 nm is formed, and an extraction electrode portion 5 is formed in an exposed state at both ends thereof. On the transparent electrode 5, an organic EL composed of an organic functional layer unit including a light emitting layer (53 shown in FIG. 3), a cathode (54 shown in FIG. 3), a sealing member (56 shown in FIG. 3), and the like. The element ELD is laminated to constitute the flexible surface light emitter 2. A conductive wire 4 connected to the power supply member 3 is formed from an external power source (not shown) on the exposed extraction electrode portion 5 at both ends of the flexible surface light emitter 2, and a seal member 6 is formed thereon. It is sealed with.

《Outline of configuration of flexible surface light emitter》
The configuration of the flexible surface light emitter 2 according to the present invention is not particularly limited as long as it has at least the resin base material F having a thickness in the range of 3 to 50 μm. 3 shows. Details of each constituent material of the flexible surface light emitter 2 will be described later.

  FIG. 3 is a schematic cross-sectional view showing an example of a basic configuration of a flexible surface light emitter applicable to the present invention.

  In the flexible surface light emitter shown in FIG. 3, a resin substrate F having a thickness in the range of 3 to 50 μm, which is a technical feature of the present invention, is disposed.

  The anode 51 is disposed on the resin base material F. In the present invention, the anode is preferably a transparent anode 51 having silver as a main component and having a thickness in the range of 2 to 20 nm. It is. Further, from the viewpoint of improving the uniformity of the thin silver layer when forming the transparent anode 51 containing silver as a main component, the base layer 52 containing a compound having a nitrogen atom or a sulfur atom is used as the resin substrate F and the transparent anode. 51 is preferable.

  On the transparent anode 51, an organic functional layer unit 53 composed of a hole transport layer, a light emitting layer, a hole blocking layer, an electron transport layer, a cathode buffer layer, and the like is formed. A stop adhesive layer 55 and a sealing member 56 are provided.

  The transparent base material F according to the present invention is characterized in that the thickness is in the range of 3 to 50 μm. From the viewpoint of being able to express a supple movement such as “hagoromo” more naturally, The thickness is preferably in the range of 30 μm, more preferably in the range of 10 to 30 μm.

In the flexible surface light emitter 2 according to the present invention, a thin resin substrate F is used, and the mass of the flexible surface light emitter 2 is preferably 0.1 g / cm ² or less, more preferably 0. It is within the range of 0.01 to 0.1 g / cm ² , and by setting the mass of the flexible surface light emitter within the above range, it is possible to apply “hagoromo” only by applying a weak force such as external means such as wind. From the viewpoint of being able to express the movement smoothly as described above, this is a preferable mode.

<Organic EL lighting device>
The organic EL lighting device of the present invention has a flexible surface light emitter having an organic electroluminescent element on a resin substrate having a thickness in the range of 3 to 50 μm, and a power supply member that supplies power to the organic electroluminescent element. In addition, the power supply member is configured to support at least one portion of the flexible surface light emitter.

  By using the organic EL lighting device having such a configuration, a natural and supple movement is possible, and an organic EL lighting device having a rendering effect and decorativeness as an elegant object can be obtained.

  Hereinafter, preferred embodiments of the organic EL lighting device of the present invention will be described with reference to the drawings.

(First embodiment)
One of the embodiments has a basic configuration as shown in FIG. That is, it is the configuration of the organic EL lighting device 1 of the present invention in which the two portions (joint positions P1 and P2 with the power supply member 3) of the flexible surface light emitter 2 are held by the power supply member 3.

  As described above, in FIG. 1, the organic EL lighting device 1 includes a flexible surface light emitter 2 having an organic electroluminescence element on a resin substrate having a thickness of 3 to 50 μm, and diagonal lines of the flexible surface light emitter 2. The power supply member 3 that supplies power to the electrodes that constitute the organic EL element is provided at two locations (bonding positions P1 and P2 with the power supply member). The power supply member 3 is necessary for the organic EL element to emit light. In addition to supplying power, it has an organic EL element on a thin resin substrate, and has the role of holding a flexible surface light emitter that can be supple and floated like a robe. doing.

  In addition, as a means for causing the flexible surface light emitter 2 according to the present invention to fly or drift, the means for causing the flexible surface light emitter 2 to fly or drift by simply moving the power feeding member 3 up and down may be used. It may be a method in which the luminous body is blown or drifted by applying wind by other operating means such as a blowing means.

(Second Embodiment)
In FIG. 4, as a second embodiment, two guide wire through holes 8 are provided at both ends of the center of the flexible surface light emitter 2 having the configuration illustrated in FIG. 1. An organic EL lighting device 1 having a configuration through a guide wire 7 is shown.

  In the flexible surface light emitter 2 shown in FIG. 1, the two diagonal positions (joining positions P <b> 1 and P <b> 2 with the power supply member) are held by the power supply member 3. In the configuration shown in FIG. 4, the flexible surface light emitter 2 is moved up and down by restricting the movement of the flexible surface light emitter 2 by the guide wire 7 in the configuration shown in FIG. It can be moved only in the direction, stable movement can be realized in a narrow space, and the function as an indoor lighting device can be expressed more.

  Further, in addition to the vertical movement by the power supply member 3, in order to realize a more supple movement over the entire surface of the flexible surface light emitter, it is a preferable aspect to provide an external means for causing the flexible surface light emitter to follow in the lower part. .

  As an external means, as shown in FIG. 4, a blower 9 can be used in the lower part. A number of blowing holes are provided on the upper surface of the blower 9, and by changing the strength (air volume) of the wind 10 sent out from the plurality of blowing holes, the flexible surface light emitter 2 can be moved up and down and more freely. It can express the fluttering.

  In FIG. 4, the blower 9 is shown as an example as an external means for propagating the flexible surface light emitter. However, as shown in FIG. 10 to be described later, it is attached to a drive motor that reciprocates mainly left and right. It may be.

  In FIG. 4, an example in which the guide wire 7 is applied as the position defining means of the flexible surface light emitter 2 is shown, but other position defining means may include a rod-shaped member, a tape-shaped member, and the like.

  Moreover, as the installation position of the guide wire through-hole 8, in addition to the center both ends of the flexible surface light emitter 2 illustrated in FIG. 4, the guide wire through-hole 8 may be provided at the short side, each corner, or an arbitrary position. it can.

(Third embodiment)
FIG. 5 shows an example in which the organic EL lighting device having the guide wire 7 shown in FIG. 4 at both ends in the center is housed inside a transparent cylinder having a blower disposed at the lower part.

  In FIG. 5, two diagonal lines (joint positions P <b> 1 and P <b> 2 with the power supply member) of the flexible surface light emitter 2 illustrated in FIG. 4 are held by the power supply member 3, and further, both ends at the center of the flexible surface light emitter 2. An example is shown in which the organic EL lighting device provided with guide guides 7 is housed in a cylindrical container 11 having a hollow inside.

  The cylindrical container 11 may be entirely made of a resin material having high light transmission, but at least the central appreciation part 12 is made of a highly transparent resin material such as an acrylic plate and is flexible. The specification is such that the vertical movement of the surface light emitter 2 can be appreciated as an object.

  As shown in FIG. 5, the flexible surface light emitter 2 </ b> B constituting the organic EL lighting housed in the cylindrical container 11 is moved from 2 </ b> B by the vertical winding of the power supply member 3 and the blower 9 (blower fan) installed at the bottom. The position is moved up and down from 2A or 2B to 2C. Furthermore, the flexible surface light emitter 2 (2A to 2C) is flexibly fluttered or drifted like a “hagoromo” by changing the wind strength or the air blowing position of the blower 9 (blower fan). As a lighting device that emits light while moving up and down, in addition to the production effect, it is possible to realize decorativeness and grace as an indoor object.

(Fourth embodiment)
In FIG. 6, by holding the two points of one end of the flexible surface light emitter 2 with the power supply member 3, the situation like a flag fluttering in the wind is created by the external means 9, and further free movement is expressed. An example of the organic EL lighting device 1 is shown.

  In the organic EL lighting device 1 illustrated in FIG. 6, the two points at the lower end of the flexible surface light emitter 2 are held by the two power supply members 3, and the other end is not held by the power supply member 3. It is in a state where it can flutter. By taking such a configuration, the flexible surface light emitter 2 can be freely moved without being restricted by movement, like a flag, by blowing the wind 10 using the blower 9 from below. .

(Fifth embodiment)
FIG. 7 shows an example in which a plurality of flexible surface light emitters 2 are mounted on a T-shirt 13 as an example of a costume as an example of the lightweight and excellent flexibility of the organic EL lighting device of the present invention. is there.

  As shown in FIG. 7, when a plurality of flexible surface light emitters 2 are mounted as illumination devices on the front of the costume, all the flexible surface light emitters 2 may emit light in the same emission color, Or it is good also as a structure which expresses the state which flutters in a wind by controlling each different light emission color or light emission timing with each flexible light-emitting body.

(Shape and arrangement of organic EL element in flexible surface light emitter)
<Shape of organic EL element>
In FIG. 1 to FIG. 7 described above, a strip shape (rectangular shape) is shown as an example as the shape of the organic EL element formed on the transparent base material F of the flexible surface light emitter 2. The shape is not limited to the exemplified shape, and may be a circle, a triangle, a diamond, a star, or an indefinite shape.

  In addition, a plurality of organic EL elements having different shapes may be provided on the transparent base material F of the single flexible surface light emitter 2.

<Configuration of flexible surface light emitter>
The flexible surface light emitter according to the present invention may be transparent or opaque, or may be a single-sided light emitting type or a double-sided light emitting type.

  8A to 8C are schematic cross-sectional views showing an example of the configuration of a strip-shaped flexible surface light emitter 2 applicable to the organic EL lighting device of the present invention.

  The example shown in FIG. 8A has a configuration in which a band-shaped flexible surface light emitter 2 sandwiches a single-side light emitting type organic EL element (ELD1) between two flexible resin base materials F, and the organic EL element (ELD1). Is connected to a power supply member and a power source (not shown) via a conductive wire 4. The single-sided light emitting type organic EL element (ELD1) is one of a pair of opposed electrodes constituting the organic EL element, and one electrode is made of a light-impermeable material. 3 is a type that radiates light L from the transparent electrode 51 side (upper part of the paper surface of FIG. 8A).

  The example shown in FIG. 8B has a configuration in which a band-shaped flexible surface light emitter 2 sandwiches a double-sided light emitting type organic EL element (ELD2) between two flexible resin substrates F, and the organic EL element (ELD2). Is connected to a power supply member and a power source (not shown) via a conductive wire 4. The double-sided light emitting type organic EL element (ELD2) is a type in which each of a pair of opposing electrodes constituting the organic EL element is composed of a transparent electrode 51 having light transparency, and radiates light L from both sides. It is.

  Moreover, as shown in FIG. 8C, an organic EL element (ELD) may be formed on a single flexible resin base material F.

<Arrangement of organic EL elements in flexible surface light emitter>
9A to 9C show various arrangement examples of the organic EL element ELD on the flexible surface light emitter 2.

  The arrangement example shown in FIG. 9A is the entire surface of the resin base material F as an example of the flexible surface light emitter 2 supported by a power supply member (not shown) at least one place as illustrated in FIGS. An example in which an organic EL element (ELD) is arranged is shown.

  FIG. 9B shows an example in which an organic EL element (ELD) is arranged in the tip end region of the resin base material F in the flexible surface light emitter 2 supported at least at one place by a power supply member (not shown). It is.

  Furthermore, like the flexible surface light emitter 2 shown in FIG. 9C, a tandem organic EL element (ELD (W)) that emits white light and a toning that has a function of emitting light in blue, green, or red, respectively. Type organic EL elements (ELD (R), ELD (G), ELD (B)) may be mixed and arranged. As described above, when a plurality of organic EL elements are arranged on one resin base material F, the transparent anode 51 to the sealing member 56 as shown in FIG. Or a laminated structure having a plurality of organic functional layer units as shown in FIG. 11 or FIG. 12, which will be described later, on the flexible resin substrate F, for example.

  The details of the tandem organic EL element and the toning organic EL element having a configuration in which a plurality of organic functional layer units are stacked will be described later with reference to FIGS.

<Installation method of organic EL lighting device>
As an installation example of the organic EL lighting device of the present invention, in FIG. 5, an example in which the organic EL lighting device including the guide wire 7 is housed in a transparent cylindrical body having a blower disposed in the lower part is provided. A flexible surface light emitter having an organic electroluminescent element on a resin substrate having a thickness in the range of 3 to 50 μm, and a power supply member that supplies power to the organic electroluminescent element, A power supply member that supports at least one portion of the flexible surface light emitter, and within a range that satisfies the condition that the flexible surface light emitter can flutter or float, for example, FIG. 10A to FIG. 10C An installation method as shown in FIG.

  10A to 10C, for example, the organic EL lighting device 1 in which the power feeding member 3 is provided on one end side as shown in FIG. A unit composed of the organic EL lighting device 1 having a member (not shown) and having a drive unit 15, a flexible surface light emitter (not shown), and a power feeding member (not shown) is fixed to the stand 14 in FIG. 10A. FIG. 10B is a method of installing on the wall surface 16, and FIG. 10C is a method of installing using the suspension member 18 from the ceiling 17.

  In any method, for example, by reciprocating the drive unit 15 to the left and right, the organic EL lighting device 1 provided therein moves flexibly while emitting light, and exhibits decorativeness and grace as an indoor object. be able to.

《Organic electroluminescence device》
Next, details of the organic EL element formed on the flexible surface light emitter, which is a main component of the organic EL lighting device of the present invention, will be described.

  The configuration of the organic EL element included in the flexible surface light emitter according to the present invention can form various constituent layers on the resin substrate and the transparent anode. For example, the following (i) to (v) It may have a layer structure. Further, the following light emitting layer is preferably composed of a blue light emitting layer, a green light emitting layer and a red light emitting layer.

(I) Configuration in which transparent anode / organic functional layer unit (light emitting layer / electron transport layer) / cathode / sealing adhesive / sealing member are laminated on resin base material (ii) on resin base material, Transparent anode / organic functional layer unit (hole transport layer / light emitting layer / electron transport layer) / cathode / sealing adhesive / sealing member (iii) transparent anode / organic on resin substrate Functional layer unit (hole transporting layer / light emitting layer / hole blocking layer / electron transporting layer) / cathode / adhesive for sealing / sealing member (iv) transparent anode / Organic functional layer unit (hole transport layer / light emitting layer / hole blocking layer / electron transport layer / cathode buffer layer) / cathode / adhesive for sealing / sealing member (v) on resin substrate Transparent anode / organic functional layer unit (anode buffer layer / hole transport layer / light emitting layer / hole blocking layer / electron transport layer / cathode buffer) Over layer) / configuration cathode / encapsulation adhesive / sealing member are stacked,
Etc.

  The constitution of the organic EL device according to the present invention is characterized in that a resin substrate having a thickness in the range of 3 to 50 μm is applied as at least the resin substrate.

  As a more preferable embodiment, as shown in FIG. 3, the anode disposed on the resin base material F is a transparent anode 51 mainly composed of silver and having a thickness in the range of 2 to 20 nm. This is a preferred embodiment. Further, from the viewpoint of improving the uniformity of the thin silver layer when forming the transparent anode 51 containing silver as a main component, the base layer 52 containing a compound having a nitrogen atom or a sulfur atom is used as the resin substrate F and the transparent anode. 51 is preferably provided.

  Next, each component of the organic EL element will be described.

[Resin substrate]
The resin base material applied to the organic EL element of the present invention is a flexible resin material that can be folded and is a thin resin base material having a thickness in the range of 3 to 50 μm. To do.

  Examples of the resin substrate according to the present invention include polyethylene terephthalate (abbreviation: PET), polyester such as polyethylene naphthalate (abbreviation: PEN), polyethylene, polypropylene, cellophane, cellulose diacetate, cellulose triacetate (abbreviation: TAC), Cellulose acetate butyrate, cellulose acetate propionate (abbreviation: CAP), cellulose esters such as cellulose acetate phthalate, cellulose nitrate and their derivatives, polyvinylidene chloride, polyvinyl alcohol, polyethylene vinyl alcohol, syndiotactic polystyrene, polycarbonate (Abbreviation: PC), norbornene resin, polymethylpentene, polyether ketone, polyimide, polyethersulfone (abbreviation: ES), polyphenylene sulfide, polysulfones, polyether imide, polyether ketone imide, polyamide, fluororesin, nylon, polymethyl methacrylate, acrylic and polyarylates, Arton (trade name, manufactured by JSR) and Appel (trade name, Mitsui Chemicals) And cycloolefin-based resins, etc.

  Among these resin substrates, films such as polyethylene terephthalate (abbreviation: PET), polybutylene terephthalate, polyethylene naphthalate (abbreviation: PEN), and polycarbonate (abbreviation: PC) are flexible in terms of cost and availability. It is preferably used as a resin base material.

  The thickness of the resin base material according to the present invention is characterized by being in the range of 3 to 50 μm, preferably in the range of 3 to 35 μm, more preferably in the range of 3 to 30 μm. Especially preferably, it exists in the range of 10-30 micrometers.

  The resin base material which concerns on this invention can also be used suitably also as a sealing member (transparent base material) of an organic EL element. The resin base material may be an unstretched film or a stretched film.

  The resin base material applicable to the present invention can be manufactured by a conventionally known general film forming method. For example, a melt casting method for producing an unstretched resin base material that is substantially amorphous and not oriented by melting a resin as a material with an extruder, extruding it with an annular die or a T-die, and rapidly cooling it. For example, a solution casting method in which a resin as a material is dissolved in a solvent to form a dope, and then the dope is cast on a metal belt to form a dope can be used. In addition, the unstretched resin base material is transported in the direction of the resin base material (vertical axis direction) by a known method such as uniaxial stretching, tenter sequential biaxial stretching, tenter simultaneous biaxial stretching, tubular simultaneous biaxial stretching, or the like. , MD direction), or a stretched resin substrate can be produced by stretching in a direction perpendicular to the conveying direction of the resin substrate (horizontal axis direction, TD direction). Although the draw ratio in this case can be suitably selected according to the resin used as the raw material of the resin base material, it is preferably in the range of 2 to 10 times in the vertical axis direction and the horizontal axis direction.

<Application of support film>
The resin base material constituting the flexible surface light emitter according to the present invention is a thin resin base material having a thickness in the range of 3 to 50 μm. From the viewpoint of prevention, it is preferable to apply a support film during production. The role of this support film is to be used temporarily only during the production of flexible organic EL elements. After each predetermined functional layer is laminated on the resin substrate, it is peeled off from the resin substrate. Let

  Examples of the resin material applicable as the support film include various resin films that can be used as the resin base material according to the present invention.

  The thickness of the support film is not particularly limited, but is preferably in the range of 50 to 300 μm in consideration of mechanical strength, handling properties, and the like. The thickness of the support film can be measured using a micrometer.

  As a method for imparting a support film to the resin base material according to the present invention, a method of forming an adhesive layer between the resin base material and the support film and press-contacting with a nip roller or the like, and a resin base material and After laminating the support film, there can be mentioned a method in which a potential difference is provided between the two films laminated in a vacuum and charged and adhered. This method of charging and adhering is a method of electrostatically adhering both films by charging both films with opposite charges, and after manufacturing the organic EL element, A static elimination process is performed, and both films are peeled off.

(Anode: Transparent anode)
As an anode constituting the organic EL device according to the present invention, a metal such as Ag or Au or an alloy containing a metal as a main component, a CuI or indium-tin composite oxide (ITO), a metal such as SnO ₂ or ZnO Although an oxide can be mentioned, it is preferably a metal or an alloy containing a metal as a main component, more preferably silver or an alloy containing silver as a main component.

  When the transparent anode is composed mainly of silver, the purity of the silver material used is preferably 99% or more. Further, palladium (Pd), copper (Cu), gold (Au), or the like may be added to ensure the stability of silver.

  The transparent anode is a layer composed mainly of silver, but specifically, it may be formed of silver alone or may be composed of an alloy containing silver (Ag). Examples of such an alloy include silver-magnesium (Ag-Mg), silver-copper (Ag-Cu), silver-palladium (Ag-Pd), silver-palladium-copper (Ag-Pd-Cu), silver -Indium (Ag-In) etc. are mentioned.

  Among the constituent materials constituting the anode, the anode constituting the organic EL device according to the present invention is a transparent anode composed mainly of silver and having a thickness in the range of 2 to 20 nm. Preferably, the thickness is more preferably in the range of 4 to 12 nm. A thickness of 20 nm or less is preferable because the absorption component and reflection component of the transparent anode can be kept low and high light transmittance can be maintained.

  In the present invention, the layer composed mainly of silver means that the silver content in the transparent anode is 60% by mass or more, preferably the silver content is 80% by mass or more, More preferably, the silver content is 90% by mass or more, and particularly preferably the silver content is 98% by mass or more. The term “transparent” in the transparent anode according to the present invention means that the light transmittance at a wavelength of 550 nm is 50% or more.

  The transparent anode according to the present invention may have a configuration in which a layer composed mainly of silver is divided into a plurality of layers as needed.

  In the present invention, in the case where the anode is a transparent anode composed mainly of silver, it is preferable to provide a base layer underneath from the viewpoint of improving the uniformity of the silver film of the transparent anode to be formed. Although there is no restriction | limiting in particular as a base layer, It is preferable that it is a layer containing the organic compound which has a nitrogen atom or a sulfur atom, and the method of forming a transparent anode on the said base layer is a preferable aspect.

  In general, as a method for forming a transparent anode that is a transparent conductive film, for example, a method using a wet process such as a coating method, an inkjet method, a coating method, a dipping method, a vapor deposition method (resistance heating, EB method, etc.), a sputtering method, etc. And a method using a dry process such as a CVD method. In the method for producing an organic EL device of the present invention, the transparent anode according to the present invention is preferably formed by a vapor deposition method.

As a vapor deposition method applicable to the present invention, a vacuum vapor deposition method is mainly used. In a resistance heating boat for vapor deposition in a vacuum vapor deposition apparatus, silver which is a constituent material of a transparent anode, and other if necessary Fill the alloy. The resistance heating boat for vapor deposition is made of molybdenum or tungsten. At the time of forming the transparent anode, the degree of vacuum in the vacuum deposition apparatus is reduced to, for example, a range of 1 × 10 ⁻² to 1 × 10 ⁻⁶ Pa, and then the above-described deposition containing a transparent anode forming material such as silver. The resistance heating boat is energized and heated, and a silver thin film is vapor-deposited on the resin substrate or the underlayer at a predetermined vapor deposition rate (nm / sec), and the thickness is in the range of 2 to 20 nm. An anode is formed.

  Moreover, the transparent anode can be sufficiently conductive by being formed on the base layer without the high-temperature annealing treatment (for example, a heating process at 150 ° C. or higher) after the formation.

(Underlayer)
In the organic EL device according to the present invention, when the anode is a transparent anode composed mainly of silver, the organic compound having at least a nitrogen atom or a sulfur atom at a position adjacent to the resin substrate side of the transparent anode. It is a preferable aspect to have a base layer containing, and further, the organic compound contained in the base layer is preferably a compound having a nitrogen atom having an effective unshared electron pair not involved in aromaticity.

  In the present invention, when a transparent anode mainly composed of silver is formed, by providing a base layer containing an organic compound having a nitrogen atom or a sulfur atom underneath it, when forming the transparent anode, In addition, the nitrogen atom or sulfur atom of the organic compound contained in the underlayer interacts, and as a result, the diffusion distance of silver atoms on the surface of the underlayer is reduced, thereby suppressing the formation of silver aggregates. And a transparent anode having high uniformity can be formed.

  In the present invention, the organic compound having at least a nitrogen atom or a sulfur atom is not particularly limited. For example, International Publication No. 2013/105569, International Publication No. 2013/141097, International Publication No. 2013/161750 Mention may be made of the compounds described.

[Intermediate electrode]
In the organic EL device according to the present invention, in the case of a structure in which two or more organic functional layer units are laminated, in order to obtain electrical connection between the anode (first electrode) and the cathode (second electrode), Each organic functional layer unit can be separated by an intermediate electrode having independent connection terminals.

[Organic functional layer unit]
Next, the charge injection layer, the light emitting layer, the hole transport layer, the electron transport layer, and the blocking layer will be described in this order as typical layers constituting the organic functional layer unit.

(Charge injection layer)
The charge injection layer according to the present invention is a layer provided between the electrode and the light-emitting layer in order to lower the driving voltage and improve the light emission luminance. “The organic EL element and its industrialization front line (November 30, 1998) The details are described in Chapter 2, “Electrode Materials” (pages 123-166) (hereinafter referred to as Reference Material 1) of Volume 2 of “NTS Co., Ltd.” There is an electron injection layer.

  In general, the charge injection layer is present between the anode and the light emitting layer or the hole transport layer in the case of a hole injection layer, and between the cathode and the light emitting layer or the electron transport layer in the case of an electron injection layer. However, the present invention is characterized in that the charge injection layer is disposed adjacent to the transparent electrode. When used in an intermediate electrode, it is sufficient that at least one of the adjacent electron injection layer and hole injection layer satisfies the requirements of the present invention.

  The hole injection layer according to the present invention is a layer disposed adjacent to the anode, which is a transparent electrode, in order to lower the driving voltage and improve the light emission luminance, and details thereof are described in Reference Document 1.

  The details of the hole injection layer are also described in JP-A-9-45479, JP-A-9-260062, JP-A-8-288069, etc. Examples of the material used for the hole injection layer include: , Porphyrin derivatives, phthalocyanine derivatives, oxazole derivatives, oxadiazole derivatives, triazole derivatives, imidazole derivatives, pyrazoline derivatives, pyrazolone derivatives, phenylenediamine derivatives, hydrazone derivatives, stilbene derivatives, polyarylalkane derivatives, triarylamine derivatives, carbazole derivatives, Inrocarbazole derivatives, isoindole derivatives, acene derivatives such as anthracene and naphthalene, fluorene derivatives, fluorenone derivatives, polyvinylcarbazole, aromatic amines introduced into the main chain or side chain Material or oligomer, polysilane, a conductive polymer or oligomer (e.g., PEDOT (polyethylene dioxythiophene): PSS (polystyrene sulfonic acid), aniline copolymers, polyaniline, polythiophene, etc.) and the like can be mentioned.

  Examples of the triarylamine derivative include benzidine type represented by α-NPD (4,4′-bis [N- (1-naphthyl) -N-phenylamino] biphenyl), and MTDATA (4,4 ′, 4 ″). Examples include a starburst type represented by -tris [N- (3-methylphenyl) -N-phenylamino] triphenylamine) and a compound having fluorene or anthracene in the triarylamine-linked core.

  In addition, hexaazatriphenylene derivatives such as those described in JP-A-2003-519432 and JP-A-2006-135145 can also be used as a hole transport material.

  The electron injection layer is a layer provided between the cathode and the light emitting layer for lowering the driving voltage and improving the light emission luminance. When the cathode is composed of the transparent electrode according to the present invention, It is provided adjacent to the transparent electrode, and its details are described in the above reference material 1.

  The details of the electron injection layer are described in JP-A-6-325871, JP-A-9-17574, JP-A-10-74586, and the like. Specific examples of materials preferably used for the electron injection layer are as follows. Metals represented by strontium and aluminum, alkali metal compounds represented by lithium fluoride, sodium fluoride, potassium fluoride, etc., alkali metal halide layers represented by magnesium fluoride, calcium fluoride, etc. Examples thereof include an alkaline earth metal compound layer typified by magnesium, a metal oxide typified by molybdenum oxide and aluminum oxide, and a metal complex typified by lithium 8-hydroxyquinolate (Liq). Moreover, when the transparent electrode in this invention is a cathode, organic materials, such as a metal complex, are used especially suitably. The electron injection layer is desirably a very thin film, and although depending on the constituent material, the layer thickness is preferably in the range of 1 nm to 10 μm.

(Light emitting layer)
The light emitting layer constituting the organic functional layer unit of the organic EL device according to the present invention preferably has a structure containing a phosphorescent light emitting compound as a light emitting material.

  This light emitting layer is a layer that emits light by recombination of electrons injected from the electrode or the electron transport layer and holes injected from the hole transport layer, and the light emitting portion is in the layer of the light emitting layer. Alternatively, it may be the interface between the light emitting layer and the adjacent layer.

  Such a light emitting layer is not particularly limited in its configuration as long as the contained light emitting material satisfies the light emission requirements. Moreover, there may be a plurality of layers having the same emission spectrum and emission maximum wavelength. In this case, it is preferable to have a non-light emitting intermediate layer between the light emitting layers.

  The total thickness of the light emitting layers is preferably in the range of 1 to 100 nm, and more preferably in the range of 1 to 30 nm because a lower driving voltage can be obtained. In addition, the sum total of the thickness of a light emitting layer is the thickness also including the said intermediate | middle layer, when a nonluminous intermediate | middle layer exists between light emitting layers.

  In the present invention, one of the features is a structure in which two or more light emitting layer units are laminated, and the thickness of each light emitting layer is preferably adjusted within a range of 1 to 50 nm. More preferably, it is more preferable to adjust within the range of 1 to 20 nm. When the plurality of stacked light emitting layers correspond to the respective emission colors of blue, green, and red, there is no particular limitation on the relationship between the thicknesses of the blue, green, and red light emitting layers.

  For the light emitting layer as described above, a light emitting material and a host compound to be described later may be used by publicly known methods such as a vacuum deposition method, a spin coating method, a casting method, an LB method (Langmuir-Blodget, Langmuir Broadgett method), and an ink jet method. Can be formed.

  In the light emitting layer, a plurality of light emitting materials may be mixed, and a phosphorescent light emitting material and a fluorescent light emitting material (also referred to as a fluorescent dopant or a fluorescent compound) may be mixed and used in the same light emitting layer. The structure of the light-emitting layer preferably includes a host compound (also referred to as a light-emitting host) and a light-emitting material (also referred to as a light-emitting dopant compound), and emits light from the light-emitting material.

<Host compound>
As the host compound contained in the light emitting layer, a compound having a phosphorescence quantum yield of phosphorescence emission at room temperature (25 ° C.) of less than 0.1 is preferable. Further, the phosphorescence quantum yield is preferably less than 0.01. Moreover, it is preferable that the volume ratio in the layer is 50% or more among the compounds contained in a light emitting layer.

  As the host compound, a known host compound may be used alone, or a plurality of types of host compounds may be used. By using a plurality of types of host compounds, it is possible to adjust the movement of charges, and the efficiency of the organic electroluminescent device can be improved. In addition, by using a plurality of kinds of light emitting materials described later, it is possible to mix different light emission, thereby obtaining an arbitrary light emission color.

  The host compound used in the light emitting layer may be a conventionally known low molecular compound or a high molecular compound having a repeating unit, and a low molecular compound having a polymerizable group such as a vinyl group or an epoxy group (evaporation polymerizable light emitting host). )

  Examples of host compounds applicable to the present invention include, for example, JP-A Nos. 2001-257076, 2002-308855, 2001-313179, 2002-319491, 2001-357777, 2002-334786, 2002-8860, 2002-334787, 2002-15871, 2002-334788, 2002-43056, 2002-334789, 2002 No. -75645, No. 2002-338579, No. 2002-105445, No. 2002-343568, No. 2002-141173, No. 2002-352957, No. 2002-203683, No. 2002. 363 No. 27, No. 2002-231453, No. 2003-3165, No. 2002-234888, No. 2003-27048, No. 2002-255934, No. 2002-260861, No. 2002-280183. No. 2002, No. 2002-299060, No. 2002-302516, No. 2002-305083, No. 2002-305084, No. 2002-308837, US Patent Application Publication No. 2003/0175553, US Patent Application Publication No. 2006/0280965, US Patent Application Publication No. 2005/0112407, US Patent Application Publication No. 2009/0017330, US Patent Application Publication No. 2009/0030202, US Patent Public application No. 2005/238919, International Publication No. 2001/039234, International Publication No. 2009/021126, International Publication No. 2008/056746, International Publication No. 2004/093207, International Publication No. 2005/089025, International Publication No. 2007/063796, International Publication No. 2007/063754, International Publication No. 2004/107822, International Publication No. 2005/030900, International Publication No. 2006/114966, International Publication No. 2009/086028, International Publication No. 2009 No./003898, International Publication No. 2012/023947, Japanese Patent Application Laid-Open No. 2008-074939, Japanese Patent Application Laid-Open No. 2007-254297, European Patent No. 2034538, and the like.

<Light emitting material>
As the light-emitting material that can be used in the present invention, a phosphorescent compound (also referred to as a phosphorescent compound, a phosphorescent material, or a phosphorescent dopant) and a fluorescent compound (both a fluorescent compound or a fluorescent material) are used. Say).

<Phosphorescent compound>
A phosphorescent compound is a compound in which light emission from an excited triplet is observed. Specifically, it is a compound that emits phosphorescence at room temperature (25 ° C.). Although defined as being a compound of 01 or more, a preferable phosphorescence quantum yield is 0.1 or more.

  The phosphorescence quantum yield can be measured by the method described in Spectroscopic II, page 398 (1992 edition, Maruzen) of Experimental Chemistry Course 4 of the 4th edition. The phosphorescence quantum yield in the solution can be measured using various solvents, but when using a phosphorescent compound in the present invention, the phosphorescence quantum yield is 0.01 or more in any solvent. Should be achieved.

  The phosphorescent compound can be appropriately selected from known compounds used for the light emitting layer of a general organic EL device, but preferably contains a group 8-10 metal in the periodic table of elements. More preferred are iridium compounds, more preferred are iridium compounds, osmium compounds, platinum compounds (platinum complex compounds) or rare earth complexes, and most preferred are iridium compounds.

  In the present invention, even if at least one light emitting layer is a layer containing two or more phosphorescent compounds, the concentration ratio of the phosphorescent compound in the light emitting layer is the thickness of the light emitting layer. It may be an aspect that changes in the vertical direction.

  Specific examples of known phosphorescent compounds that can be used in the present invention include compounds described in the following documents.

  Nature 395, 151 (1998), Appl. Phys. Lett. 78, 1622 (2001), Adv. Mater. 19, 739 (2007), Chem. Mater. 17, 3532 (2005), Adv. Mater. 17, 1059 (2005), International Publication No. 2009/100991, International Publication No. 2008/101842, International Publication No. 2003/040257, US Patent Application Publication No. 2006/835469, US Patent Application Publication No. 2006 /. Examples thereof include compounds described in US Patent No. 0202194, US Patent Application Publication No. 2007/0087321, US Patent Application Publication No. 2005/0244673, and the like.

  Inorg. Chem. 40, 1704 (2001), Chem. Mater. 16, 2480 (2004), Adv. Mater. 16, 2003 (2004), Angew. Chem. lnt. Ed. 2006, 45, 7800, Appl. Phys. Lett. 86, 153505 (2005), Chem. Lett. 34, 592 (2005), Chem. Commun. 2906 (2005), Inorg. Chem. 42, 1248 (2003), International Publication No. 2009/050290, International Publication No. 2002/015645, International Publication No. 2009/000673, US Patent Application Publication No. 2002/0034656, and US Pat. No. 7,332,232. US Patent Application Publication No. 2009/0108737, US Patent Application Publication No. 2009/0039776, US Patent No. 6921915, US Patent No. 6,687,266, US Patent Application Publication No. 2007/0190359, US Patent Application Publication No. 2006/0008670, US Patent Application Publication No. 2009/0165846, US Patent Application Publication No. 2008/0015355, US Pat. No. 7,250,226, US Pat. No. 7,396,598 US patent Examples include compounds described in Japanese Patent Application Publication No. 2006/0263635, US Patent Application Publication No. 2003/0138657, US Patent Application Publication No. 2003/0152802, US Pat. No. 7090928, and the like. it can.

  Also, Angew. Chem. lnt. Ed. 47, 1 (2008), Chem. Mater. 18, 5119 (2006), Inorg. Chem. 46, 4308 (2007), Organometallics 23, 3745 (2004), Appl. Phys. Lett. 74, 1361 (1999), International Publication No. 2002/002714, International Publication No. 2006/009024, International Publication No. 2006/056418, International Publication No. 2005/019373, International Publication No. 2005/123873, International Publication No. 2005/123873, International Publication No. 2007/004380, International Publication No. 2006/082742, US Patent Application Publication No. 2006/0251923, US Patent Application Publication No. 2005/0260441, US Pat. No. 7,393,599. Description, US Pat. No. 7,534,505, US Pat. No. 7,445,855, US Patent Application Publication No. 2007/0190359, US Patent Application Publication No. 2008/0297033, US Pat. No. 7,338,722 , US special Examples include compounds described in Japanese Patent Application Publication No. 2002/0134984, US Patent No. 7279704, US Patent Application Publication No. 2006/098120, US Patent Application Publication No. 2006/103874, and the like. it can.

  Furthermore, International Publication No. 2005/076380, International Publication No. 2010/032663, International Publication No. 2008/140115, International Publication No. 2007/052431, International Publication No. 2011/134013, International Publication No. 2011/157339. International Publication No. 2010/086089, International Publication No. 2009/113646, International Publication No. 2012/020327, International Publication No. 2011/051404, International Publication No. 2011/004639, International Publication No. 2011/073149, Special The compounds described in JP 2012-069737 A, JP 2009-114086 A, JP 2003-81988 A, JP 2002-302671 A, JP 2002-363552 A, and the like can also be mentioned.

  In the present invention, preferred phosphorescent compounds include organometallic complexes having Ir as a central metal. More preferably, a complex containing at least one coordination mode of a metal-carbon bond, a metal-nitrogen bond, a metal-oxygen bond, or a metal-sulfur bond is preferable.

  The phosphorescent compound described above (also referred to as a phosphorescent metal complex) is described in, for example, Organic Letter, vol. 16, 2579-2581 (2001), Inorganic Chemistry, Vol. 30, No. 8, 1685-1687 (1991), J. Am. Am. Chem. Soc. , 123, 4304 (2001), Inorganic Chemistry, Vol. 40, No. 7, 1704-1711 (2001), Inorganic Chemistry, Vol. 41, No. 12, 3055-3066 (2002) , New Journal of Chemistry. 26, 1171 (2002), European Journal of Organic Chemistry, 4, 695-709 (2004), and methods disclosed in the references described in these documents. Can be synthesized.

<Fluorescent compound>
Fluorescent compounds include coumarin dyes, pyran dyes, cyanine dyes, croconium dyes, squalium dyes, oxobenzanthracene dyes, fluorescein dyes, rhodamine dyes, pyrylium dyes, perylene dyes, stilbene dyes. And dyes, polythiophene dyes, and rare earth complex phosphors.

(Hole transport layer)
The hole transport layer is made of a hole transport material having a function of transporting holes. In a broad sense, the hole injection layer and the electron blocking layer also have the function of a hole transport layer. The hole transport layer can be provided as a single layer or a plurality of layers.

  The hole transport material has any of hole injection or transport and electron barrier properties, and may be either organic or inorganic. For example, triazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives, pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, oxazole derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, Examples include stilbene derivatives, silazane derivatives, aniline copolymers, conductive polymer oligomers, and thiophene oligomers.

  As the hole transport material, those described above can be used, but porphyrin compounds, aromatic tertiary amine compounds and styrylamine compounds can be used, and in particular, aromatic tertiary amine compounds can be used. preferable.

  Representative examples of aromatic tertiary amine compounds and styrylamine compounds include N, N, N ′, N′-tetraphenyl-4,4′-diaminophenyl, N, N′-diphenyl-N, N′— Bis (3-methylphenyl)-[1,1′-biphenyl] -4,4′-diamine (abbreviation: TPD), 2,2-bis (4-di-p-tolylaminophenyl) propane, 1,1 -Bis (4-di-p-tolylaminophenyl) cyclohexane, N, N, N ', N'-tetra-p-tolyl-4,4'-diaminobiphenyl, 1,1-bis (4-di-p -Tolylaminophenyl) -4-phenylcyclohexane, bis (4-dimethylamino-2-methylphenyl) phenylmethane, bis (4-di-p-tolylaminophenyl) phenylmethane, N, N'-diphenyl-N, '-Di (4-methoxyphenyl) -4,4'-diaminobiphenyl, N, N, N', N'-tetraphenyl-4,4'-diaminodiphenyl ether, 4,4'-bis (diphenylamino) c Audriphenyl, N, N, N-tri (p-tolyl) amine, 4- (di-p-tolylamino) -4 '-[4- (di-p-tolylamino) styryl] stilbene, 4-N, N- Examples include diphenylamino- (2-diphenylvinyl) benzene, 3-methoxy-4′-N, N-diphenylaminostilbenzene, N-phenylcarbazole and the like.

  For the hole transport layer, known methods such as vacuum deposition, spin coating, casting, printing including ink jet, and LB (Langmuir Brodget, Langmuir Broadgett) are used as the hole transport material. Thus, it can be formed by thinning. Although there is no restriction | limiting in particular about the layer thickness of a positive hole transport layer, Usually, about 5 nm-5 micrometers, Preferably it is the range of 5-200 nm. The hole transport layer may have a single layer structure composed of one or more of the above materials.

  Moreover, p property can also be made high by doping the material of a positive hole transport layer with an impurity. Examples thereof include JP-A-4-297076, JP-A-2000-196140, 2001-102175 and J.P. Appl. Phys. 95, 5773 (2004), and the like.

  Thus, it is preferable to increase the p property of the hole transport layer because an element with lower power consumption can be manufactured.

(Electron transport layer)
The electron transport layer is made of a material having a function of transporting electrons, and in a broad sense, an electron injection layer and a hole blocking layer are also included in the electron transport layer. The electron transport layer can be provided as a single layer structure or a stacked structure of a plurality of layers.

  In the electron transport layer having a single-layer structure and the electron transport layer having a multilayer structure, an electron transport material (also serving as a hole blocking material) constituting a layer portion adjacent to the light emitting layer is used as an electron transporting material. What is necessary is just to have the function to transmit. As such a material, any one of conventionally known compounds can be selected and used. Examples include nitro-substituted fluorene derivatives, diphenylquinone derivatives, thiopyran dioxide derivatives, carbodiimides, fluorenylidenemethane derivatives, anthraquinodimethane, anthrone derivatives, and oxadiazole derivatives. Furthermore, in the above oxadiazole derivative, a thiadiazole derivative in which the oxygen atom of the oxadiazole ring is substituted with a sulfur atom, and a quinoxaline derivative having a quinoxaline ring known as an electron-withdrawing group can also be used as a material for the electron transport layer. it can. Furthermore, a polymer material in which these materials are introduced into a polymer chain, or a polymer material having these materials as a polymer main chain can also be used.

In addition, metal complexes of 8-quinolinol derivatives such as tris (8-quinolinol) aluminum (abbreviation: Alq ₃ ), tris (5,7-dichloro-8-quinolinol) aluminum, tris (5,7-dibromo-8- Quinolinol) aluminum, tris (2-methyl-8-quinolinol) aluminum, tris (5-methyl-8-quinolinol) aluminum, bis (8-quinolinol) zinc (abbreviation: Znq), etc. and the central metal of these metal complexes A metal complex replaced with In, Mg, Cu, Ca, Sn, Ga, or Pb can also be used as a material for the electron transport layer.

  The electron transport layer can be formed into a thin film from the above material by a known method such as a vacuum deposition method, a spin coating method, a casting method, a printing method including an inkjet method, and an LB method. Although there is no restriction | limiting in particular about the layer thickness of an electron carrying layer, Usually, it exists in the range of 5 nm-5 micrometers, Preferably it exists in the range of 5-200 nm. The electron transport layer may have a single structure composed of one or more of the above materials.

(Blocking layer)
Examples of the blocking layer include a hole blocking layer and an electron blocking layer, which are provided as necessary in addition to the constituent layers of the organic functional layer unit described above. For example, it is described in JP-A Nos. 11-204258, 11-204359, and “Organic EL elements and their forefront of industrialization” (issued by NTT, Inc. on November 30, 1998). Hole blocking (hole block) layer and the like.

  The hole blocking layer has a function of an electron transport layer in a broad sense. The hole blocking layer is made of a hole blocking material that has a function of transporting electrons and has a very small ability to transport holes, and transports electrons while blocking holes. The recombination probability can be improved. Moreover, the structure of an electron carrying layer can be used as a hole-blocking layer as needed. The hole blocking layer is preferably provided adjacent to the light emitting layer.

  On the other hand, the electron blocking layer has a function of a hole transport layer in a broad sense. The electron blocking layer is made of a material that has a function of transporting holes and has an extremely small ability to transport electrons. By blocking electrons while transporting holes, the electron recombination probability is reduced. Can be improved. Moreover, the structure of a positive hole transport layer can be used as an electron blocking layer as needed. The thickness of the hole blocking layer applied to the present invention is preferably in the range of 3 to 100 nm, more preferably in the range of 5 to 30 nm.

[Cathode: Second electrode]
The cathode (second electrode) is an electrode film that functions to supply holes to the organic functional layer unit, and a metal, an alloy, an organic or inorganic conductive compound, or a mixture thereof is used. Specifically, gold, aluminum, silver, magnesium, lithium, magnesium / copper mixture, magnesium / silver mixture, magnesium / aluminum mixture, magnesium / indium mixture, indium, lithium / aluminum mixture, rare earth metal, ITO, ZnO, TiO Oxide semiconductors such as ₂ and SnO ₂ .

  The second electrode can be produced by forming a thin film of these conductive materials by a method such as vapor deposition or sputtering. The sheet resistance as the second electrode is preferably several hundred Ω / □ or less, and the film thickness is usually selected within the range of 5 nm to 5 μm, preferably 5 to 200 nm.

  In addition, in the case where the organic EL element takes out the emitted light L also from the second electrode, for example, the double-sided emission type as illustrated in FIG. 8B, the second electrode having high light transmittance is selected and configured. do it.

(Sealing member)
Examples of the sealing means used for sealing the organic EL element according to the present invention include a method of bonding the sealing member, the second electrode 6 and the resin base material F with an adhesive.

  As a sealing member, it should just be arrange | positioned so that the display area | region of an organic EL element may be covered, and it may be concave plate shape or flat plate shape. Further, transparency and electrical insulation are not particularly limited.

  Specifically, a glass plate, a polymer plate, a film, a metal plate, a film, etc. are mentioned. Examples of the glass plate include soda-lime glass, barium / strontium-containing glass, lead glass, aluminosilicate glass, borosilicate glass, barium borosilicate glass, and quartz. Examples of the polymer plate include polycarbonate, acrylic, polyethylene terephthalate, polyether sulfide, and polysulfone. Examples of the metal plate include one or more metals or alloys selected from the group consisting of stainless steel, iron, copper, aluminum, magnesium, nickel, zinc, chromium, titanium, molybdenum, silicon, germanium, and tantalum.

As the sealing member, a polymer film and a metal film can be preferably used from the viewpoint of reducing the thickness of the organic EL element. Further, the polymer film has a water vapor transmission rate of 1 × 10 ⁻³ g / m ² .multidot.m at a temperature of 25 ± 0.5 ° C. and a relative humidity of 90 ± 2% RH measured by a method according to JIS K 7129-1992. The oxygen permeability measured by a method according to JIS K 7126-1987 is preferably 1 × 10 ⁻³ ml / m ² · 24 h · atm (1 atm is 1.01325 × 10 ⁵ a Pa) equal to or lower than a temperature of 25 ± 0.5 ° C., water vapor permeability at a relative humidity of 90 ± 2% RH is preferably not more than ^{1 × 10 -3 g / m 2} · 24h.

  In addition, the organic functional layer unit is sandwiched, and the second electrode and the organic functional layer unit are coated on the outer side of the second electrode facing the transparent substrate, and an inorganic or organic layer is formed in contact with the transparent substrate. Thus, a sealing film can be suitably used. In this case, the material for forming the sealing film may be any material that has a function of suppressing intrusion of moisture, oxygen, or the like that degrades the organic EL element. For example, silicon oxide, silicon dioxide, silicon nitride, or the like is used. be able to. Furthermore, in order to improve the brittleness of the sealing film, it is preferable to have a laminated structure of these inorganic layers and organic layers made of organic materials. The method for forming these films is not particularly limited. For example, vacuum deposition method, sputtering method, reactive sputtering method, molecular beam epitaxy method, cluster ion beam method, ion plating method, plasma polymerization method, atmospheric pressure plasma A polymerization method, a plasma CVD method, a laser CVD method, a thermal CVD method, a coating method, or the like can be used.

  In the gap between the sealing member and the display area of the organic EL element, it is preferable to inject an inert gas such as nitrogen or argon, or an inert liquid such as fluorinated hydrocarbon or silicon oil in the gas phase and the liquid phase. . Further, the gap between the sealing member and the display area of the organic EL element can be evacuated, or a hygroscopic compound can be sealed in the gap.

<< Configuration of organic EL element >>
[Tandem type organic EL device]
FIG. 11 is a schematic cross-sectional view showing an example of a white light emitting type organic EL element having a tandem configuration.

  An organic EL element 400 shown in FIG. 11 includes a transparent anode 51, a first organic functional layer unit 103C, a second organic functional layer unit 103D, a third organic functional layer unit 103E, and a counter electrode on a resin base material F. Two electrodes 54 (cathode) are sequentially laminated. For example, when the first organic functional layer unit 103C emits red light, the second organic functional layer unit 103D emits green light, and the third organic functional layer unit 103E emits blue light, the transparent electrode 51 (anode) and the second electrode 54 ( White light is emitted by applying a voltage between the cathode). In the organic EL element illustrated in FIG. 11, the description of the sealing structure, the extraction electrode, the wiring, and the like is omitted.

[Toning type organic EL device]
FIG. 12 is a schematic cross-sectional view showing an example of the configuration of an organic EL element capable of monochromatic emission in addition to white emission with a toning type configuration.

  In FIG. 12, the organic EL element 200 includes a first electrode 51 (transparent anode), a first organic functional layer unit 103C, a first intermediate electrode layer unit 104B, a second organic functional layer unit 103D, on a resin substrate F. The second intermediate electrode layer unit 104C, the third organic functional layer unit 103E, and the second electrode 54 (cathode) that is a counter electrode are sequentially stacked and configured. The first intermediate electrode layer unit 104B and the second intermediate electrode layer unit 104C have base layers 142B and 143B containing nitrogen atoms, respectively, on the resin base material F side. A configuration having 143A is shown. A light extraction film (not shown) is formed on the opposite side of the transparent substrate 101 from the first electrode 102 side. In the configuration of FIG. 12, the first electrode 51 is an anode that is a transparent electrode, and the second electrode 54 is a cathode. In the organic EL element illustrated in FIG. 12, the description of the sealing structure, the extraction electrode, the wiring, and the like is omitted.

  The first electrode 51 and the first intermediate electrode 142A are wired with lead wires, and the first organic functional layer unit 103C emits light by applying a drive voltage V1 within a range of 2 to 40 V to each connection terminal. To do. Similarly, between the first intermediate electrode 142A and the second intermediate electrode 143A is wired with a lead wire, and the second organic functional layer is applied to each connection terminal within the range of 2 to 40V as the drive voltage V2. Unit 103D emits light. Similarly, the second organic electrode 143A and the second electrode 54 are also wired with lead wires, and the third organic functional layer unit is applied to each connection terminal within the range of 2 to 40 V as the drive voltage V3. 103E emits light.

  As described above, by applying each organic functional layer unit independently to emit light, blue single color light emission, green single color light emission, red single color light emission, and white light emission can be obtained by simultaneously emitting light.

  The toning type organic EL element having such characteristics can be suitably used, for example, in a flexible surface light emitter having the arrangement shown in FIG. 9C.

  The organic electroluminescent lighting device of the present invention comprises a flexible surface light emitter having a thin film resin base material, and can be moved naturally and supple, and has an electronic performance and decoration as an elegant object. A luminescent lighting device can be provided.

DESCRIPTION OF SYMBOLS 1 Organic EL lighting device 2, 2A, 2B Flexible surface light emitter 3 Power supply member 4 Conductor 5 Lead electrode 6 Seal member 7 Guide wire 8 Guide wire through hole 9 Blower 10 Wind 11 Cylindrical container 12 Appreciation part 13 Costume (T-shirt)
14 Stand 15 Drive unit 16 Wall surface 17 Ceiling 18 Hanging member 51 Transparent anode (first electrode)
52, 142B, 143B Underlayer 53 Organic functional layer unit 54 Cathode (second electrode)
55 Sealing adhesive layer 56 Sealing member 103C First organic functional layer unit 103D Second organic functional layer unit 103E Third organic functional layer unit 104B First intermediate electrode layer unit 104C Second intermediate electrode layer unit 142A First intermediate Electrode 143A Second intermediate electrode 200, 400, ELD, ELD1, ELD2, ELD (W), ELD (R), ELD (G), ELD (B) Organic electroluminescence element F Resin substrate h Light emitting point L Light emitting light P1 , P2 Joint position with the feeding member V1, V2, V3 Drive voltage

Claims (13)

  A flexible surface light emitter having an organic electroluminescent element on a resin substrate having a thickness in the range of 3 to 50 μm; and a power supply member that supplies power to the organic electroluminescent element, wherein the power supply member is the flexible surface An organic electroluminescence lighting device characterized by supporting at least one portion of a luminous body.   2. The organic electroluminescence lighting device according to claim 1, wherein the organic electroluminescence element has a transparent anode containing silver as a main component and having a thickness in the range of 2 to 20 nm. The organic electroluminescent lighting device according to claim 1, wherein the flexible surface light emitter has a mass of 0.1 g / cm ² or less.   The organic according to any one of claims 1 to 3, wherein the flexible surface light emitter and the power supply member are housed inside a cylindrical body having a transmissive viewing part. Electroluminescence lighting device.   The organic electroluminescent lighting device according to any one of claims 1 to 4, wherein the flexible surface light emitter is held by a guide wire and moves along the guide wire.   The organic electroluminescence lighting device according to any one of claims 1 to 5, wherein the flexible surface light emitter is allowed to fly by an external means.   The organic electroluminescence lighting device according to claim 6, wherein the external means for causing the flexible surface light emitter to fly is a blower or a drive motor.   The organic electroluminescence lighting device according to any one of claims 1 to 7, wherein the organic electroluminescence element is disposed only at a tip portion of the flexible surface light emitter.   The organic electroluminescence element according to any one of claims 1 to 7, wherein the organic electroluminescence element is continuously or intermittently disposed on the entire surface of the flexible surface light emitter. Lighting device.   The organic electroluminescence lighting device according to claim 1, wherein at least one of the organic electroluminescence elements emits white light.   The organic electroluminescence lighting device according to any one of claims 1 to 9, wherein at least one of the organic electroluminescence elements emits monochromatic or toned light in blue, green, or red. .   The organic electroluminescence lighting device according to any one of claims 1 to 11, wherein the lighting device including the flexible surface light emitter and the power supply member is attached to a stand or a wall surface. .   The organic electroluminescence lighting device according to any one of claims 1 to 11, wherein the lighting device including the flexible surface light emitter and the power feeding member is suspended from a ceiling.

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