JP5147110B2 - Planar light-emitting illumination device - Google Patents

Description

  The present invention relates to a planar light emitting illumination device, and more particularly to an effect illumination device having a fluctuation function.

In recent years, electroluminescence elements such as organic electroluminescence (EL) elements have attracted attention as planar light-emitting illumination devices. An electroluminescent element emits light when a voltage is applied to a fluorescent material, and can be classified into an organic electroluminescent element and an inorganic electroluminescent element depending on the fluorescent material used. In particular, the organic electroluminescence element can easily emit light on a plane, can emit light with a high luminance of about 100 to 100,000 cd / m ² at a low voltage of about 10 V such as a battery, and the combination of materials constituting the fluorescent substance. Since it can emit a large number of colors, it attracts attention as a flat light emitter.

The windows in homes usually have natural window light in the daytime and at the same time have transparent window glass so that you can see the outside scenery to get a sense of openness. Fluctuation, obtained by hanging wind chimes and silver paper strips on the windowsill using the lighting on the window surface, creates a comfortable atmosphere that gives a soft impact and feels in harmony with nature. .
However, in the Tokyo metropolitan area and the like, housing has increased due to the concentration of houses, and it has become a big issue how to make a room without windows by using artificial lighting. This problem is the same in densely populated areas even in detached houses.

Under these circumstances, artificial lighting using indoor devices has been developed in recent years.
Conventionally, a phosphor as a light source is disposed in the cover on both sides of a transparent window glass, and a sheet-like diffuse reflection member is provided in a detachable manner so as to adhere to and cover the outer surface of the window glass. An apparatus has been proposed (Patent Document 1).
Such a window device is arranged in close contact with the outer surface of the window glass as a light guide for the light from the phosphors on both sides by rolling up the diffuse reflection member during daytime and taking in natural light at night. A diffuse reflection member is used.

Japanese Utility Model Publication No. 5-87727

However, in artificial lighting such as Patent Document 1, the diffuse reflection member disposed in close contact with the outer surface of the window glass at night using artificial light only acts as a light guide, and thus the natural light as described above. It was extremely difficult to get close fluctuations.
As mentioned above, there are many situations in Japan where housing cannot be taken in urban areas, and when there are no windows, there is no lighting or wind, and lighting that incorporates natural fluctuations. I couldn't.
This invention is made | formed in view of the said situation, and it aims at providing the effect illumination which imitated the window surface also in the room without a window.

Surface-emitting type illumination device of the present invention, a planar light emitting device, the planar light emission surface side of the planar light emitting device, at a position at a predetermined distance from the light emitting surface, drooping allowed was predetermined width A planar light emitting illumination device comprising a plurality of flexible strips arranged at a predetermined interval, and the planar light emitting device. The element is an organic electroluminescence element, and the organic electroluminescence element has a built-in power supply circuit for supplying DC power,
The surface having the predetermined width of the strip-shaped reflector faces the light-emitting surface in parallel , and substantially the entire surface of the planar light-emitting surface of the planar light-emitting element is substantially the entire surface of the plurality of strip-shaped reflectors. Facing each other .
According to this configuration, since the planar light-emitting element and the band-shaped reflector that hangs down on the light emitting surface side of the planar light-emitting element are combined, the band-like shape that fluctuates due to air convection due to heat generation from the light-emitting surface of the planar light-emitting element. Since the reflector scatters the light from the planar light emitting element and generates light fluctuations, it is possible to achieve an effect imitating lighting and wind even without a window surface. In order to generate fluctuation, it is desirable that a region where the band-shaped reflector does not exist exists in a region facing the light emitting surface.
Furthermore, with this configuration, various fluctuations can be generated by changes in individual strips.
Furthermore, according to this configuration, fluctuations can be efficiently generated because heat is appropriately generated.
Furthermore, because of this configuration, the planar light emitting element has a built-in power supply circuit that supplies direct current, so it can secure a heat generation amount greater than a certain amount derived from the power supply circuit and does not rely on indoor air convection for air conditioning. , Can ensure stable fluctuation.

  As described above, according to the present invention, the planar light-emitting element and the strip-shaped reflector that hangs down on the light emitting surface side of the planar light-emitting element are combined. The band-like reflector that fluctuates due to air convection scatters light from the planar light emitting element, so that it is possible to produce lighting and wind effects without a window surface.

  In addition, since the planar light emitting device of the present invention has a built-in power supply circuit for supplying DC power, it is possible to secure a heat generation amount exceeding a certain amount derived from the power supply circuit and rely on indoor air convection for air conditioning. Therefore, stable fluctuation can be secured.

Hereinafter, a planar light emitting illumination device according to an embodiment of the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 and 2, the planar light-emitting illumination device includes an organic electroluminescence panel formed by forming an organic electroluminescence element as the planar light-emitting element 100 formed on a glass substrate 101, and this The frame 200 is supported so as to surround the periphery, and a strip-shaped reflector 300 formed at a predetermined interval from the light emitting surface of the planar light emitting element. In addition, this strip | belt-shaped reflector 300 is formed with strip-shaped aluminum foil, and it becomes clear from the cross-sectional view of this planar light-emitting illumination device shown in FIGS. One end is supported by the formed support part 201 and is suspended from the light emitting surface side of the planar light emitting element at a position spaced apart from the light emitting surface.
This organic electroluminescence element includes a power supply circuit (not shown) for supplying direct current.

  In addition, the organic electroluminescent element used here is formed on the translucent glass substrate 101, and is composed of an organic electroluminescent panel that looks like a window glass when turned off. It is also possible to adopt a configuration in which a power supply circuit for supplying DC power is incorporated.

  According to this configuration, the strip-shaped reflector 300 is made of an aluminum foil that is highly reflective and light, and is suspended from the upper portion thereof. Therefore, due to heat generated from the light emitting surface of the organic electroluminescent element, the strip-shaped reflector 300 is stripped. The reflectors fluctuate, the light scatters, and lighting such as lighting and wind windows that is in harmony with nature is possible. 2A shows a cross section where the strip-shaped reflector exists, and FIG. 2B shows a cross section where the strip-shaped reflector does not exist. Heat flows H1 and H2 exist, respectively, so that the strip-shaped reflector 300 moves in the direction S. Move. The fluctuation of the band-like reflector generates a soft light fluctuation, so that a state close to natural light can be experienced.

  Forming more favorable fluctuations by forming a strip-shaped reflector having a plurality of divided areas so as to cover a part of the area rather than covering the entire light emitting surface of the organic electroluminescence element. However, the whole may be covered, and the strip-shaped reflector may be integrated. However, it is desirable to form a slight gap so that a heat space can be formed between the light emitting surface of the organic electroluminescence element and the strip-shaped reflector.

  Furthermore, the planar light emitting element may be formed by arranging a single organic electroluminescence element on the entire surface supported by the frame, or by arranging a plurality of elements in a matrix.

  Further, the organic electroluminescence element 100 has an anode 102 made of a transparent conductive film and a light emitting function on the surface of a light-transmitting glass substrate 101 as shown in an enlarged cross-sectional view of the main part in FIG. A layer 103 and a cathode 104 are sequentially stacked. As the light-transmitting substrate 101, a light-transmitting glass plate such as soda lime glass or non-alkali glass, a light-transmitting plastic plate, or the like can be used. The light-transmitting substrate 101 only needs to be light-transmitting, and may be colorless and transparent, slightly colored, or ground glass.

  The layer 103 having a light emitting function is a multilayer film in which a hole transport layer is stacked on the anode 102 side and an electron injection layer is stacked on the cathode 104 side in addition to a so-called light emitting layer. When a negative voltage is applied to the electrons, electrons injected through the electron injection layer and holes injected through the hole transport layer are combined in the light emitting layer to emit light. Light emitted from the layer 103 having a light emitting function in this manner is transmitted through the anode 102 made of a transparent conductive film and the light transmitting substrate 101 and extracted from the surface side of the light transmitting substrate 101. The organic electroluminescence element 100 can emit light with high luminance at a low voltage of about 10 V such as a battery.

The anode 102 is an electrode for injecting holes into the layer having a light emitting function, and an electrode material made of a metal, an alloy, a conductive compound, or a mixture thereof having a large work function is preferably used. Is preferably 4 eV or more. Examples of the material of the anode 2 include Au (gold) metal, CuI (copper iodide), ITO (indium tin oxide: indium tin oxide), SnO ₂ (tin oxide), ZnO (zinc oxide), and the like. The translucent conductive material can be used. The anode 102 is formed by, for example, forming and patterning these electrode materials on the surface of the light-transmitting substrate 101 by a method such as a vacuum evaporation method or a sputtering method. In order to transmit light emitted from the layer 103 having a light-emitting function through the anode 102 and radiate the light to the outside, the light transmittance of the anode 102 is preferably set to 70% or more. Furthermore, the sheet resistance of the anode 102 is preferably several hundred Ω / □ or less, and particularly preferably 100 Ω / □ or less. Here, the film thickness of the anode 102 varies depending on the material in order to control the light transmittance, sheet resistance and other characteristics of the anode 102 as described above, but is set to a range of 500 nm or less, preferably 10 to 200 nm. Is desirable.

The cathode 104 is an electrode for injecting electrons into the layer 103 having a light emitting function, and an electrode material made of a metal, an alloy, a conductive compound, or a mixture thereof having a low work function is preferably used. The function is preferably 5 eV or less. Examples of the electrode material of the cathode 104 include sodium, sodium-potassium alloy, lithium, magnesium, aluminum, magnesium-silver mixture, magnesium-indium mixture, aluminum-lithium alloy, Al / Al ₂ O ₃ mixture, Al / LiF mixture and the like. Similarly to the anode, the cathode 104 can be obtained by, for example, patterning these electrode materials after film formation by a method such as a vacuum evaporation method or a sputtering method. In order to irradiate the anode 102 with light emitted from the layer 103 having a light emitting function, the light transmittance of the cathode 4 is preferably 10% or less. Here, the film thickness of the cathode 104 varies depending on the material, but in order to control characteristics such as light transmittance of the cathode 104, it is usually 500 nm or less, preferably 100 to 200 nm.

  Here, of the layer 103 having a light emitting function, a light emitting material or a doping material used for the light emitting layer sandwiched between the electron transport layer and the hole transport layer is anthracene, naphthalene, pyrene, tetracene, coronene, perylene, phthaloperylene, naphthaloperylene, Diphenylbutadiene, tetraphenylbutadiene, coumarin, oxadiazole, bisbenzoxazoline, bisstyryl, cyclopentadiene, quinoline metal complex, tris (8-hydroxyquinolinato) aluminum complex, tris (4-methyl-8-quinolinato) aluminum Complexes, tris (5-phenyl-8-quinolinato) aluminum complexes, aminoquinoline metal complexes, benzoquinoline metal complexes, tri- (p-terphenyl-4-yl) amine, 1-aryl-2,5-di (2 -Thienyl ) There are, but are not limited to, pyrrole derivatives, pyran, quinacridone, rubrene, distilbenzene derivatives, distilarylene derivatives, and various fluorescent dyes.

  The layer 103 having a light emitting function has a hole transport layer laminated between the light emitting layer and the anode 2, that is, on the anode side, and the material constituting the hole transport layer has the ability to transport holes. A compound that has a hole injection effect from the anode 102, an excellent hole injection effect for the light emitting layer, prevents movement of electrons to the hole transport layer, and has an excellent thin film forming ability. Can be mentioned. Specifically, phthalocyanine derivatives, naphthalocyanine derivatives, porphyrin derivatives, N, N′-bis (3-methylphenyl)-(1,1′-biphenyl) -4,4′-diamine (TPD) and 4,4 Aromatic diamine compounds such as' -bis [N- (naphthyl) -N-phenyl-amino] biphenyl (α-NPD), oxazole, oxadiazole, triazole, imidazole, imidazolone, stilbene derivative, pyrazoline derivative, tetrahydroimidazole, Polyarylalkanes, butadiene, 4,4 ′, 4 ″ -tris (N- (3-methylphenyl) N-phenylamino) triphenylamine (m-MTDATA), and polyvinyl carbazole, polysilane, polyethylene dioxide thiophene (PEDOT) ) And other conductive polymers Molecular material and the like.

The layer 103 having a light emitting function has an electron injection layer laminated between the light emitting layer and the cathode 104, that is, on the cathode 104 side. As a material constituting the electron injection layer, an electron transporting ability is used. And has an electron injection effect from the cathode 104, an excellent electron injection effect for the layer 103 having a light emitting function, and further prevents movement of holes to the electron injection layer, and a thin film forming ability Can be mentioned. Specifically, fluorene, bathophenanthroline, bathocuproine, anthraquinodimethane, diphenoquinone, oxazole, oxadiazole, triazole, imidazole, anthraquinodimethane, etc. and their compounds, metal complex compounds or nitrogen-containing five-membered ring derivatives is there. Furthermore, the polymer material used for a polymer organic electroluminescent element can also be used. For example, polyparaphenylene and derivatives thereof, fluorene and derivatives thereof, and the like. The electron injection layer can be formed, for example, by co-evaporating bathophenanthroline and Cs (cesium) at a molar ratio of 1: 1.
As described above, according to the present embodiment, by using the organic electroluminescent element, it is possible to realize a soft effect illumination that generates little fluctuation and is close to natural light with little attenuation.
In the above-described embodiment, an example in which an organic electroluminescence element is used as a planar light emitting element has been described. However, the present invention is not limited to an organic electroluminescence element, and other light emitting elements such as an inorganic electroluminescence element can be used. Also good.

  As described above, according to this embodiment, it is possible to realize highly efficient and highly efficient lighting with little attenuation.

  As described above, according to the present invention, since it is possible to realize a lighting effect that is close to natural light, it can be applied in a wide range from home lighting to offices and showrooms.

1 is an external view showing a planar light emitting illumination device according to an embodiment of the present invention. Sectional drawing of the planar light-emitting illuminating device of embodiment of this invention Explanatory drawing which shows the structure of the organic electroluminescent element used with the planar light emission type illuminating device of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Planar light emitting element 200 Frame 201 Support part 300 Strip | belt-shaped reflector

Claims (1)

A planar light emitting device;
A planar light emitting surface side of the planar light emitting device, at a position at a predetermined distance from the light emitting surface, a planar light emitting type illumination device having a belt-shaped reflector of the droop caused to be a predetermined width ,
The belt-like reflector is composed of a plurality of flexible belt-like bodies arranged at a predetermined interval,
The planar light emitting element is an organic electroluminescence element,
The organic electroluminescence element has a built-in power supply circuit for supplying DC power,
The surface having the predetermined width of the strip-shaped reflector faces the light-emitting surface in parallel , and substantially the entire surface of the planar light-emitting surface of the planar light-emitting element is substantially the entire surface of the plurality of strip-shaped reflectors. Face-to-face light-emitting lighting devices facing each other.

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