WO2014013566A1

WO2014013566A1 - Mirror device

Info

Publication number: WO2014013566A1
Application number: PCT/JP2012/068200
Authority: WO
Inventors: 黒田　和男; 吉田　綾子
Original assignee: パイオニア株式会社
Priority date: 2012-07-18
Filing date: 2012-07-18
Publication date: 2014-01-23

Abstract

A mirror device having a plurality of light-emitting elements supported upon a substrate. The plurality of light-emitting elements are a plurality of MIM light-emitting elements and a plurality of organic EL elements. Each of the MIM light-emitting elements and organic EL elements or both a group of the MIM light-emitting elements and a group of the organic EL elements are arranged alternately upon the rear surface of a light-transmitting substrate.

Description

Mirror device

The present invention relates to a mirror device having a light emitting function including an organic electroluminescence element.

An organic electroluminescent element is configured by, for example, sequentially laminating an organic layer including an anode, a light emitting layer, and a cathode on a transparent glass substrate. By injecting current into the organic layer through the anode and the cathode, the electroluminescence ( Hereinafter, the light-emitting element expresses EL). An organic EL element is a self-luminous surface-emitting device, and is used for a display device or a lighting device.

There is an EL illumination built-in mirror that can arrange an organic EL element in a frame shape around the mirror and project an object such as a user's face on the mirror (see Patent Document 1).

In order to extract light from one of the anode and the cathode (light extraction electrode), a so-called metal-dielectric using a silver thin film that is a metal having high electrical conductivity and high transmittance in the visible light region as the light extraction electrode. An organic EL element having a body-metal light emitting element (hereinafter referred to as MIM light emitting element) structure has been proposed (see Patent Document 2 and Non-Patent Document 1).

Japanese Patent Laid-Open No. 2003-217868 JP 2011-165653 A

The mirror device described in Patent Document 1 has a drawback in that it does not accurately illuminate a part of the face that the user wants to see because the light source is arranged around the mirror.

When the organic EL device described in Patent Document 2 obtains white color by using red, green, and blue emission colors, the MIM light emitting device is likely to be artificial light because the spectral distribution width of each color is narrow, and improves color rendering. There is a problem that it is difficult.

Therefore, an object of the present invention is to provide a mirror device that can be toned and can function as a mirror when not emitting light, as well as an organic EL device capable of stabilizing the color of the emitted light.

The mirror device of the present invention is a mirror device having a plurality of light emitting elements carried on a substrate,
The plurality of light emitting elements are a plurality of metal-dielectric-metal light emitting elements (MIM light emitting elements) and a plurality of organic EL elements, each of the MIM light emitting elements and the organic EL elements or a group of the MIM light emitting elements. And each group of the organic EL elements is alternately arranged on the substrate.

According to the mirror device configured as described above, it is possible to perform color adjustment by changing the luminance of each organic EL element and MIM light emitting element, and it can be used as a mirror with illumination such as a hand mirror or a vanity mirror. It can be used as a mirror / illuminator attached to a pillar, ceiling, etc. to make the interior space look wider.

FIG. 1 is a partially cutaway front view of an organic EL device according to an embodiment of the present invention. FIG. 2 is a partial sectional view taken along the line CC in FIG. FIG. 3 is an enlarged cross-sectional view showing an organic EL element of the organic EL device of the example. FIG. 4 is an enlarged cross-sectional view showing the MIM light emitting element of the organic EL device of the example. FIG. 5 is a graph showing a change in light extraction efficiency with respect to photon energy of the organic EL device of the example of the present invention. FIG. 6 is a block diagram showing a schematic configuration of an organic EL device according to an embodiment of the present invention. FIG. 7 is a sectional view of an organic EL device which is another embodiment of the present invention. FIG. 8 is a partially cutaway front view of an organic EL device according to another embodiment of the present invention. FIG. 9 is a partially cutaway front view of an organic EL device which is another embodiment of the present invention. FIG. 10 is a partially cutaway front view of an organic EL device which is another embodiment of the present invention. FIG. 11 is an enlarged cross-sectional view showing an organic EL element of an organic EL device according to another embodiment of the present invention. FIG. 12 is a schematic cross-sectional view schematically showing a configuration of a light-emitting element according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<First embodiment>
FIG. 1 shows the configuration of an organic EL panel of a mirror apparatus that is an organic EL device according to an embodiment of the present invention. The organic EL panel OELD includes a plurality of organic EL elements OEL partitioned by a light-transmitting bank BK which is a non-light-emitting portion on a light-transmitting flat substrate 1 such as glass or resin, and an MIM light-emitting element MIM. Yes. As shown in FIG. 1, the organic EL panel OELD is a bottom emission type organic EL panel in which each of the organic EL elements OEL and the MIM light emitting elements MIM are alternately arranged on the back surface 1 of the translucent substrate. At the same time, since the MIM light emitting element functions as a mirror surface, it is also a mirror device. The bank BK is made of a translucent dielectric material such as optical glass or optical resin.

Each of the organic EL element OEL and the MIM light emitting element MIM is a strip-shaped light emitting portion that extends in the y direction of the xy main surface of the substrate 1, and emits light from the front surface 1 a of the translucent substrate 1. The organic EL element OEL includes red light emitting, green light emitting and blue light emitting organic EL elements Ro, Go and Bo, which are juxtaposed in parallel to emit light of emission colors of red light emitting R, green light emitting G and blue light emitting B, respectively. Radiate. The MIM light emitting element MIM also includes MIM light emitting elements Rm, Gm, and Bm that emit red light, green light, and blue light, which are juxtaposed in parallel, and emit light of red, green, and blue light emission colors, respectively. Radiate. Although the elements of RGB emission color are arranged in groups in the x direction as a set, the organic EL element OEL and the MIM light emitting element MIM are arranged so as not to be close to each other. This is because portions such as lines of the same emission color become thick and color unevenness occurs.

As described above, the organic EL elements Ro, Go, and Bo that emit red, green, and blue emission colors, respectively, and the MIM light emitting elements Rm, Gm, and Bm are repeatedly striped in parallel in a predetermined order so as to be evenly spaced. It is arranged. By adjusting the luminance of the element, light that is recognized as a single emission color is emitted from the front surface of the substrate 1 serving as a light extraction surface by mixing red, green, and blue light at an arbitrary ratio. .

Although not shown, the organic EL elements Ro, Go and Bo are each connected to the organic EL element driving unit, and the MIM light emitting elements Rm, Gm and Bm are also connected to the MIM light emitting element driving unit.

As shown in FIG. 2, each of the organic EL elements OEL is configured by laminating a translucent electrode 2, an organic layer 3o including a light emitting layer, and a reflective electrode 4 on the back surface 1b of the substrate 1 between the banks BK. The Each of the MIM light emitting elements MIM is configured by laminating a translucent electrode 2, a metal thin film MF, a dielectric layer 3m including a light emitting layer, and a reflective electrode 4 on the back surface 1b of the substrate 1 between the banks BK. The

The translucent electrode 2 constituting the anode extends along the xy direction on the substrate 1 and is formed as a common electrode. On the translucent electrode 2, a bus line MBL electrically connected to supply the power supply voltage to the translucent electrode 2 extends in the y direction and is arranged at a predetermined interval for each element x. It is formed parallel to the direction.

On the bus line MBL of the translucent electrode 2, a bank BK is formed extending along the y direction so as to cover them. The bank BK is covered with the reflective electrode 4 except for the slot SL to be separated. The reflective electrode 4 may be formed so as to expose all the banks BK. In other words, the strip-shaped reflective electrodes 4 constituting the cathode each extend along the y direction on the substrate 1 and are juxtaposed in parallel in the x direction for each element at a constant interval.

As shown in FIG. 3, each OEL of the organic EL element has, as an organic layer 3 o, for example, a hole injection layer 3 a, a hole transport layer 3 b, a light emitting layer 3 c, on the translucent electrode 2 between the banks. The electron transport layer 3d and the electron injection layer 3e may be stacked in order. The organic layer 3o sandwiched between the translucent electrode 2 and the reflective electrode 4 is a light emitting laminated body, and is not limited to these laminated structures, for example, hole blocking between the light emitting layer 3c and the electron transporting layer 3d. A layered structure including at least a light-emitting layer or a charge transport layer that can also be used, such as adding a layer (not shown), may be used. The organic layer 3o may be configured by omitting the hole transport layer 3b, the hole injection layer 3a, or the hole injection layer 3a and the electron transport layer 3d from the stacked structure. May be.

The anode translucent electrode 2 for supplying holes to the functional layers up to the light emitting layer 3c includes ITO (Indium-tin-oxide), ZnO, ZnO—Al ₂ O ₃ (so-called AZO), In ₂ O ₃ −. It may be composed of ZnO (so-called IZO), SnO ₂ —Sb ₂ O ₃ (so-called ATO), RuO ₂ or the like. Furthermore, for the translucent electrode 2, it is preferable to select a material having a transmittance of at least 10% at the emission wavelength obtained from the light emitting layer. The translucent electrode 2 usually has a single-layer structure, but may have a laminated structure made of a plurality of materials as desired.

The cathode reflective electrode 4 that supplies electrons to the functional layers up to the light emitting layer 3c is not limited, and for example, metals such as aluminum, silver, copper, nickel, chromium, gold, and platinum are used. In addition, these materials may be used only by 1 type and may use 2 or more types together by arbitrary combinations and a ratio.

The material of the reflective electrode 4 preferably includes a metal having a low work function in order to efficiently inject electrons. For example, a suitable metal such as tin, magnesium, indium, calcium, aluminum, silver, or an alloy thereof. Is used. Specific examples include low work function alloy electrodes such as magnesium-silver alloy, magnesium-indium alloy, and aluminum-lithium alloy. The reflective electrode 4 can be formed as a single layer film or a multilayer film on the organic layer 3o by sputtering or vacuum deposition. The thickness of the reflective electrode 4 is not limited as long as the reflective action of the reflective electrode 4 is maintained.

As shown in FIG. 4, each of the MIM light emitting elements MIM includes, for example, a hole injection layer 3a and a hole as a dielectric layer 3m on the metal thin film MF formed on the translucent electrode 2 between the banks. The transport layer 3b, the light emitting layer 3c, the electron transport layer 3d, and the electron injection layer 3e may be stacked in order. The dielectric layer 3m is configured by being selected from the same material as that of the OEL organic layer 3o of each of the organic EL elements. Each of the MIM light emitting elements MIM includes a metal thin film MF as a first metal electrode, a dielectric layer 3m, and a reflective electrode 4 as a second metal electrode. The translucent electrode 2 is a power supply wiring to the metal thin film MF. is there.

In another modification, a transparent insulating layer (not shown) such as SiO ₂ may be inserted between the translucent electrode 2 and the metal thin film MF, and a separate power supply wiring may be provided to the metal thin film MF. In this modification, a power supply different from the organic EL element can be used for the MIM light emitting element, and the degree of freedom is increased.

As a material of the metal thin film MF, for example, an appropriate metal such as tin, magnesium, indium, calcium, aluminum, silver, or an alloy thereof is used. Specific examples include a magnesium-silver alloy, a magnesium-indium alloy, and an aluminum-lithium alloy. The silver thin film with a thickness of 20 nm of the metal thin film MF has a transmittance of 50%. An Al film having a thickness of 10 nm as the metal thin film has a transmittance of 50%. The 20 nm-thick MgAg alloy film as the metal thin film has a transmittance of 50%. In addition, when comprising the metal thin film MF, although depending on material, a film forming method, and conditions, if the lower limit of the film thickness is 5 nm, conductivity can be ensured. The metal thin film MF can be formed as a single layer film or a multilayer film on the organic layer 3o by sputtering or vacuum deposition.

With such a configuration, the organic EL elements Ro, Go and Bo shown in FIG. 1 are applied between the electrodes sandwiched between the organic layers 3o sandwiched between the translucent electrode 2 and the reflective electrode 4 facing each other. The light is emitted with the first spectral distribution according to the voltage, and the emitted light is emitted through the translucent electrode 2 and the translucent substrate 1. In the MIM light emitting elements Rm, Gm, and Bm shown in FIG. 1, each of the dielectric layers 3m sandwiched between the metal thin film MF and the reflective electrode 4 facing each other corresponds to the applied voltage between the sandwiched electrodes. Then, light is emitted with the second spectral distribution, and the emitted light is emitted through the metal thin film MF, the translucent electrode 2 and the translucent substrate 1. The light emitted from any of the elements travels from the light emitting layer to the extraction surface and exits into the air through the translucent electrode and the glass substrate. In the middle, total reflection occurs above a predetermined critical angle at the translucent electrode glass interface or glass air interface. The totally reflected light and the light directed from the light emitting layer in the direction opposite to the extraction surface are reflected by the reflective electrode and travel toward the light extraction side. The first and second spectral distributions have first and second wavelength bands, respectively.

The MIM light emitting element has a property that plasmon coupling occurs between the metal thin film of the anode and the reflective electrode of the cathode, thereby enhancing the light emission. In addition, it is known that in the MIM light emitting device, the anode and cathode metals are parallel, and the ratio of light perpendicular to the extraction surface is large, and the emission wavelength band is narrower than that of the organic EL device.

When setting an organic EL element and an MIM light emitting element having substantially the same luminescent color, the spectral components of the first and second spectral distributions overlap, the peak wavelengths are close, and the spectral distribution Each light emitting portion is formed as an element group including different light emitting materials so that the widths are different from each other. Even if the peak wavelengths are close, the full width at half maximum of the spectrum distribution of the MIM light emitting element is narrower than the full width at half maximum of the spectrum distribution of the organic EL element.

Hereinafter, the organic layer 3o that can also be formed as the dielectric layer 3m will be described.

[Hole injection layer]
The hole injection layer 3a is preferably a layer containing an electron accepting compound (so-called hole transporting compound).

When forming by a wet coating method, the composition for forming a hole injection layer usually contains a hole transporting compound and a solvent as a constituent material of the hole injection layer. Examples of the solvent include, but are not limited to, ether solvents, ester solvents, aromatic hydrocarbon solvents, amide solvents, and the like. Examples of ether solvents include aliphatic ethers such as ethylene glycol dimethyl ether, ethylene glycol diethyl ether, propylene glycol monomethyl ether acetate (so-called PGMEA), 1,2-dimethoxybenzene, 1,3-dimethoxybenzene, anisole, and phenetole. , Aromatic ethers such as 2-methoxytoluene, 3-methoxytoluene, 4-methoxytoluene, 2,3-dimethylanisole, and 2,4-dimethylanisole.

Examples of the ester solvent include aromatic esters such as phenyl acetate, phenyl propionate, methyl benzoate, ethyl benzoate, propyl benzoate, and n-butyl benzoate.

Examples of the aromatic hydrocarbon solvent include toluene, xylene, cyclohexylbenzene, 3- isopropylpropylphenyl, 1,2,3,4-tetramethylbenzene, 1,4-diisopropylbenzene, cyclohexylbenzene, methylnaphthalene and the like. Can be mentioned.

Examples of the amide solvent include N, N-dimethylformamide and N, N-dimethylacetamide. In addition, dimethyl sulfoxide and the like can also be used. These solvent may use only 1 type and may use 2 or more types by arbitrary combinations and a ratio.

The hole transporting compound may be a polymer compound such as a polymer or a low molecular compound such as a monomer, but is preferably a low molecular compound.

The hole transporting compound is preferably a compound having an ionization potential of 4.5 eV to 6.0 eV from the viewpoint of a charge injection barrier from the anode to the hole injection layer. Examples of the hole transporting compound include aromatic amine derivatives, phthalocyanine derivatives typified by phthalocyanine copper (so-called CuPc), porphyrin derivatives, oligothiophene derivatives, polythiophene derivatives, benzylphenyl derivatives, tertiary amines with fluorene groups. Examples include linked compounds, hydrazone derivatives, silazane derivatives, silanamine derivatives, phosphamine derivatives, quinacridone derivatives, polyaniline derivatives, polypyrrole derivatives, polyphenylene vinylene derivatives, polythienylene vinylene derivatives, polyquinoline derivatives, polyquinoxaline derivatives, and carbon. Here, the derivative includes, for example, an aromatic amine derivative, and includes an aromatic amine itself and a compound having an aromatic amine as a main skeleton. There may be.

As the hole transporting compound, a conductive polymer obtained by polymerizing 3,4-ethylenedioxythiophene, which is a polythiophene derivative, in high molecular weight polystyrene sulfonic acid (so-called PEDOT / PSS) is also preferable. Furthermore, the end of the polymer of PEDOT / PSS may be capped with methacrylate or the like.

The hole transporting compound used as the material for the hole injection layer may contain any one of these compounds alone, or may contain two or more. In the case of containing two or more kinds of hole transporting compounds, the combination is arbitrary, but one or more kinds of aromatic tertiary amine polymer compounds and one or two kinds of other hole transporting compounds. The above can also be used together. From the viewpoints of amorphousness and visible light transmittance, an aromatic amine compound is preferable for the hole injection layer, and an aromatic tertiary amine compound is particularly preferable. Here, the aromatic tertiary amine compound is a compound having an aromatic tertiary amine structure, and includes a compound having a group derived from an aromatic tertiary amine.

The concentration of the hole transporting compound in the composition for forming a hole injection layer is usually 0.01% by weight or more, preferably 0.1% by weight or more, and more preferably 0.00% by weight in terms of film thickness uniformity. 5% by weight or more, usually 70% by weight or less, preferably 60% by weight or less, more preferably 50% by weight or less. If this concentration is too high, film thickness unevenness may occur, and if it is too low, defects may occur in the formed hole injection layer.

In addition to the electron-accepting compound, the composition for forming a hole injection layer may further contain other components. Examples of other components include various organic EL materials, binder resins, coatability improvers, and the like. In addition, only 1 type may be used for another component and it may use 2 or more types together by arbitrary combinations and ratios.

When forming a hole injection layer by a wet coating method, usually, a material for forming the hole injection layer is mixed with an appropriate solvent to prepare a film-forming composition, and this hole injection layer forming composition The hole injection layer is formed by applying the material onto the anode by an appropriate technique, forming a film, and drying.

The film thickness of the hole injection layer is usually 5 nm or more, preferably 10 nm or more, and usually 1000 nm or less, preferably 500 nm or less.

[Hole transport layer]
The material of the hole transport layer 3b may be any material conventionally used as a constituent material of the hole transport layer. For example, the hole transport layer is exemplified as the hole transport compound used in the hole injection layer described above. Things. In addition, arylamine derivatives, fluorene derivatives, spiro derivatives, carbazole derivatives, pyridine derivatives, pyrazine derivatives, pyrimidine derivatives, triazine derivatives, quinoline derivatives, phenanthroline derivatives, phthalocyanine derivatives, porphyrin derivatives, silole derivatives, oligothiophene derivatives, condensed polycyclic aromatics Group derivatives, metal complexes and the like. In addition, for example, polyvinylcarbazole derivatives, polyarylamine derivatives, polyvinyltriphenylamine derivatives, polyfluorene derivatives, polyarylene derivatives, polyarylene ether sulfone derivatives containing tetraphenylbenzidine, polyarylene vinylene derivatives, polysiloxane derivatives, polythiophenes Derivatives, poly (p-phenylene vinylene) derivatives, and the like. These may be any of an alternating copolymer, a random polymer, a block polymer, or a graft copolymer. Further, it may be a polymer having a branched main chain and three or more terminal portions, or a so-called dendrimer.

When the hole transport layer is formed by a wet coating method, a composition for forming a hole transport layer is prepared in the same manner as the formation of the hole injection layer, and then dried after wet film formation.

In addition to the hole transporting compound, the hole transporting layer forming composition contains a solvent. The solvent used is the same as that used for the composition for forming the hole injection layer. The film forming conditions, the drying conditions, and the like are the same as in the case of forming the hole injection layer.

The hole transport layer may contain various organic EL materials, a binder resin, a coating property improving agent and the like in addition to the hole transporting compound.

The film thickness of the hole transport layer is usually 5 nm or more, preferably 10 nm or more, and usually 300 nm or less, preferably 100 nm or less.

As described above, since at least the hole injection layer 3a or the hole transport layer 3b is preferably applied thick, the film thickness of the hole injection layer 3a and / or the hole transport layer 3b from the anode 2 to the light emitting layer 3c. Is preferably at least 100 nm.

[Light emitting layer]
The light emitting layer 3c may be a red, green and blue light emitting independent light emitting layer or a mixed light emitting layer thereof, a compound having a property of transporting holes (hole transporting compound), or A compound having an electron transporting property (electron transporting compound) can also be contained. An organic EL material may be used as a dopant material, and a hole transporting compound, an electron transporting compound, or the like may be appropriately used as a host material. There is no particular limitation on the organic EL material, and a substance that emits light at a desired emission wavelength and has good emission efficiency may be used.

Any known material can be applied as the organic EL material. For example, it may be a fluorescent material or a phosphorescent material, but it is preferable to use a phosphorescent material from the viewpoint of internal quantum efficiency. The light emitting layer may have a single layer structure or a multilayer structure made of a plurality of materials as desired. For example, a fluorescent material may be used for the blue light emitting layer, and a phosphorescent material may be used for the green and red light emitting layers. Further, a diffusion preventing layer can be provided between the light emitting layers.

Examples of fluorescent materials (blue fluorescent dyes) that emit blue light include naphthalene, perylene, pyrene, chrysene, anthracene, coumarin, p-bis (2-phenylethenyl) benzene, and derivatives thereof.

Examples of the fluorescent material (green fluorescent dye) that emits green light include aluminum complexes such as quinacridone derivatives, coumarin derivatives, and Alq3 (tris (8-hydroxy-quinoline) aluminum).

Examples of fluorescent materials that give yellow light emission (yellow fluorescent dyes) include rubrene and perimidone derivatives.

Examples of fluorescent materials that give red light emission (red fluorescent dyes) include DCM (4- (dicyanomethylene) -2-methyl-6- (p-dimethylaminostyryl) -4H-pyran) compounds, benzopyran derivatives, rhodamine derivatives, benzoates. Examples thereof include thioxanthene derivatives and azabenzothioxanthene.

The phosphorescent material is selected from, for example, the long-period periodic table (hereinafter referred to as the long-period periodic table when referring to “periodic table” unless otherwise specified). An organometallic complex containing a metal can be given. Preferred examples of the metal selected from Groups 7 to 11 of the periodic table include ruthenium, rhodium, palladium, silver, rhenium, osmium, iridium, platinum, and gold. As the ligand of the complex, a ligand in which a (hetero) aryl group such as a (hetero) arylpyridine ligand or a (hetero) arylpyrazole ligand and a pyridine, pyrazole, phenanthroline, or the like is connected is preferable. A pyridine ligand and a phenylpyrazole ligand are preferable. Here, (hetero) aryl represents an aryl group or a heteroaryl group.

Specific examples of phosphorescent materials include tris (2-phenylpyridine) iridium (so-called Ir (ppy) 3), tris (2-phenylpyridine) ruthenium, tris (2-phenylpyridine) palladium, and bis (2-phenyl). Pyridine) platinum, tris (2-phenylpyridine) osmium, tris (2-phenylpyridine) rhenium, octaethylplatinum porphyrin, octaphenylplatinum porphyrin, octaethyl palladium porphyrin, octaphenyl palladium porphyrin, and the like.

The molecular weight of the compound used as the organic EL material is usually 10,000 or less, preferably 5000 or less, more preferably 4000 or less, still more preferably 3000 or less, and usually 100 or more, preferably 200 or more, more preferably 300 or more, still more preferably. Is in the range of 400 or more. If the molecular weight of the organic EL material is too small, the heat resistance will be significantly reduced, gas generation will be caused, the film quality will be deteriorated when the film is formed, or the morphology of the functional layer will be changed due to migration, etc. There is a case. On the other hand, if the molecular weight of the organic EL material is too large, it tends to be difficult to purify the organic compound, or it may take time to dissolve the organic EL material in a solvent when formed by a wet coating method.

In addition, only 1 type may be used for an organic EL material, and 2 or more types may be used together by arbitrary combinations and a ratio. The proportion of the organic EL material in the light emitting layer is usually 0.05% by weight or more and usually 35% by weight or less. If the amount of the organic EL material is too small, uneven light emission may occur, and if the amount is too large, the light emission efficiency may be reduced. In addition, when using together 2 or more types of organic EL material, it is made for the total content of these to be contained in the said range. The component having the highest content in the light emitting layer is called a host material, and the component having a smaller content is called a guest material.

The light emitting layer may contain a hole transporting compound as a constituent material. Here, among the hole transporting compounds, examples of the low molecular weight hole transporting compound include various compounds exemplified as the hole transporting compound in the hole injection layer 3a described above, for example, diphenylnaphthyl. Aromatic diamines represented by diamines (so-called α-NPD), including two or more tertiary amines and having two or more condensed aromatic rings substituted with nitrogen atoms, or 4,4 ′, 4 ″- Aromatic amine compounds having a starburst structure such as tris (1-naphthylphenylamino) triphenylamine, aromatic amine compounds composed of tetramers of triphenylamine, and 2,2 ′, 7,7′-tetrakis And spiro compounds such as-(diphenylamino) -9,9'-spirobifluorene.

In addition, in a light emitting layer, only 1 type may be used for a hole transportable compound, and it may use 2 or more types together by arbitrary combinations and a ratio.

The proportion of the hole transporting compound in the light emitting layer is usually 0.1% by weight or more and usually 65% by weight or less. If the amount of the hole transporting compound is too small, it may be easily affected by a short circuit, and if it is too large, the film thickness may be uneven. In addition, when using together 2 or more types of hole transportable compounds, it is made for the total content of these to be contained in the said range.

The light emitting layer may contain an electron transporting compound as a constituent material. Here, among the electron transporting compounds, examples of low molecular weight electron transporting compounds include 2,5-bis (1-naphthyl) -1,3,4-oxadiazole (so-called BND), 2 , 5-bis (6 ′-(2 ′, 2 ″ -bipyridyl))-1,1-dimethyl-3,4-diphenylsilole (so-called PyPySPyPy), bathophenanthroline (so-called BPhen), 2,9 -Dimethyl-4,7-diphenyl-1,10-phenanthroline (so-called BCP, bathocuproin), 2- (4-biphenylyl) -5- (p-tertiarybutylphenyl) -1,3,4-oxadiazole (So-called tBu-PBD), 4,4′-bis (9H-carbazol-9-yl) biphenyl (so-called CBP), etc. In the light-emitting layer, an electron-transporting compound is included. , It may be used alone, or as a combination of two or more kinds in any combination and in any ratio.

The proportion of the electron transporting compound in the light emitting layer is usually 0.1% by weight or more and usually 65% by weight or less. If the amount of the electron transporting compound is too small, it may be easily affected by a short circuit, and if it is too large, the film thickness may be uneven. In addition, when using together 2 or more types of electron transport compounds, it is made for the total content of these to be contained in the said range.

In the case of forming by a wet coating method, the light emitting layer is prepared by dissolving the above light emitting layer material in an appropriate solvent to prepare a composition for forming a light emitting layer. Is formed. Therefore, in the case of forming by a wet coating method, the light emitting layer coating solution is prepared by dispersing or dissolving at least two kinds of solid contents (host material and guest material) to be the light emitting layer as a solute in a solvent. The solvent to be used can be selected from the solvents that can be used for the composition for forming a hole injection layer.

The ratio of the light emitting layer solvent to the light emitting layer forming composition for forming the light emitting layer is usually 0.01% by weight or more and usually 70% by weight or less. In addition, when using 2 or more types of solvents mixed as a solvent for light emitting layers, it is made for the sum total of these solvents to satisfy | fill this range.

The film thickness of the light emitting layer is usually 3 nm or more, preferably 5 nm or more, and usually 200 nm or less, preferably 100 nm or less. If the light emitting layer is too thin, defects may occur in the film, and if it is too thick, the driving voltage may increase.

[Electron transport layer]
The electron transport layer 3d is provided for the purpose of further improving the light emission efficiency of the organic EL element, and efficiently transports electrons injected from the cathode between the electrodes to which an electric field is applied in the direction of the light emitting layer. It is formed from an electron transporting compound capable of forming

As the electron transporting compound used for the electron transporting layer, usually, the electron injection efficiency from the cathode conductive film MF or the electron injection layer 3e is high, and the injected electrons with high electron mobility are efficiently used. A compound that can be transported is used. Examples of compounds that satisfy such conditions include metal complexes of Alq3 and 10-hydroxybenzo [h] quinoline, oxadiazole derivatives, distyrylbiphenyl derivatives, silole derivatives, 3-hydroxyflavone metal complexes, and 5-hydroxyflavones. Metal complex, benzoxazole metal complex, benzothiazole metal complex, trisbenzimidazolylbenzene, quinoxaline compound, phenanthroline derivative, 2-t-butyl-9,10-N, N′-dicyanoanthraquinonediimine, n-type hydrogenated amorphous Quality silicon carbide, n-type zinc sulfide, n-type zinc selenide and the like.

In addition, only 1 type may be used for the material of an electron carrying layer, and 2 or more types may be used together by arbitrary combinations and a ratio.

The formation method of the electron transport layer is not limited, and can be formed by a wet coating method or a dry coating method. In the case of forming by a wet coating method, the electron transport layer is prepared by dissolving the electron transport layer material in an appropriate solvent to prepare a composition for forming an electron transport layer. It is formed by removing. The solvent to be used can be selected from the solvents that can be used for the composition for forming a hole injection layer.

The film thickness of the electron transport layer is usually 1 nm or more, preferably 5 nm or more, and usually 300 nm or less, preferably 100 nm or less.

[Electron injection layer]
The electron injection layer 3e plays a role of efficiently injecting electrons injected from the cathode into the electron transport layer and the light emitting layer. For example, the electron injection layer 3e includes organic electron transport compounds represented by metal complexes such as nitrogen-containing heterocyclic compounds such as bathophenanthroline and aluminum complexes of 8-hydroxyquinoline. Further, the electron injection efficiency can be increased by doping the electron injection layer 3e of the organic electron transport compound with an electron donating material. Examples of the electron donating material include alkali metals such as sodium and cesium, alkaline earth metals such as barium and calcium, compounds thereof (CsF, Cs ₂ CO ₃ , Li ₂ O, LiF), sodium, Alkali metals such as potassium, cesium, lithium and rubidium are used. The thickness of the electron injection layer 3e is usually 5 nm or more, preferably 10 nm or more, and is usually 200 nm or less, preferably 100 nm or less.

The formation method of the electron injection layer is not limited, and can be formed by a wet coating method or a dry coating method. In the case of forming by a wet coating method, the electron injection layer is prepared by dissolving the electron injection layer material in a suitable solvent to prepare a composition for forming an electron injection layer. It is formed by removing. The solvent to be used can be selected from the solvents that can be used for the composition for forming a hole injection layer.

[Examples of organic EL element and MIM light emitting element]
As an organic EL device, an α-NPD hole transport layer (30 nm thickness) on an ITO transparent electrode (110 nm thickness), and a light emitting layer (35 nm thickness) doped with a phosphorescent material as a guest material using CBP as a host material A BCP hole blocking layer (10 nm thick), an Alq3 electron transporting layer (40 nm thick), and an Al reflective electrode were laminated in order, and the emission characteristics were examined. As an MIM light emitting element, except that an Ag metal thin film (40 nm thickness) is laminated between the ITO translucent electrode (110 nm thickness) of the organic EL element and the α-NPD hole transport layer (30 nm thickness). Then, an element having the same configuration as that of the organic EL element was prepared, and the light emission characteristics were examined.

FIG. 5 shows how much power the extracted organic EL element and MIM light-emitting element can extract outside the element with respect to the total emission power, and shows the wavelength dependence of the light extraction efficiency with respect to photon energy (wavelength). It is a graph of the spectrum distribution of EL element and MIM light emitting element EL and MIM.

As can be seen from FIG. 5, in the organic EL element EL using the ITO electrode having a wide spectrum distribution, only about 40% of the total light emission power can be taken out to the outside, but in the MIM light emitting element MIM using the silver metal thin film, As a result, sharpening of the spectral distribution appears, and light emission appears intensively in the vicinity of about 2.5 eV, and the light extraction efficiency exceeds 60% at the peak wavelength. As described above, one of the characteristics of the organic EL element is a broad spectrum distribution (natural light), while the characteristic of the MIM light emitting element is high efficiency and a very narrow spectrum distribution (artificial light). .

The present embodiment is characterized in that both element groups are arranged on the same plane, and are arranged on the same plane and adjusted from the mirror surface by adjusting the intensities of different broad spectrum distributions and very narrow spectrum distributions for each emission color. Yes. Therefore, according to the present embodiment, there is no optical incongruity, and the color rendering can be enhanced by freely adjusting colors from soft light to hard light.

As shown in FIG. 1, the positions of the RGB stripes of the MIM light-emitting elements that are mirror-finished with the RGB stripes of the organic EL elements are defined as red organic EL elements Ro, red MIM light-emitting elements Rm, blue organic EL elements Bo, and blue MIM light-emitting elements Bm , Green organic EL element Go, green MIM light emitting element Gm, red organic EL element Ro, blue MIM light emitting element Bm, green organic EL element Go, red MIM light emitting element Rm, blue organic EL element Bo, green MIM light emitting element Gm Therefore, when all the elements emit light, an effect that the line by the specific color light emitting element does not become thick can be obtained.

[Control of mirror device]
FIG. 6 is a block diagram showing a schematic configuration of a mirror device of an organic EL device according to an embodiment of the present invention. The mirror device includes a control unit 11, an organic EL element driving unit 12o and an MIM light emitting element driving unit 12m connected to the control unit 11, and an organic EL panel shown in FIG. 1 connected to these driving units. Further, the mirror device includes an operation unit 13 connected to the control unit 11.

A panel OELD of such an organic EL device includes a blue light emitting element group of organic EL elements Ro, Go and Bo, a red light emitting element group and a green light emitting element group, a blue light emitting element group of MIM light emitting elements Rm, Gm and Bm, and a red light. A plurality of sets of light emitting element groups and green light emitting element groups. The portion of the organic EL element and the portion of the MIM light emitting element are disposed in the same back surface.

The control unit 11 includes a microcomputer including a CPU, a ROM, a RAM, an internal timer, and the like that execute program codes such as processing procedures for generating various signals including a luminance designation signal, and the luminance of each element group of the organic EL device. And a lighting control routine for controlling lighting / extinguishing. The control unit 11 generates a luminance designation signal for each color for driving each element group, and supplies it to the organic EL element driving unit 12o and the MIM light emitting element driving unit 12m.

The organic EL element driving unit 12o and the MIM light emitting element driving unit 12m are a red driving unit 12Ro, a green driving unit 12Go, a blue driving unit 12Bo, and a red driving unit 12Rm, which are driving circuits for RGB light emission connected to the corresponding elements. , A green driving unit 12Gm and a blue driving unit 12Bm. According to the luminance designation signal supplied from the control unit 11, the red driving unit 12Ro, the green driving unit 12Go, the blue driving unit 12Bo, the red driving unit 12Rm, the green driving unit 12Gm, and the blue driving unit 12Bm are individually assigned to the corresponding elements. Alternatively, driving power is supplied to each of the R group, the G group, and the B group, and each of them emits light with a designated luminance. The organic EL element driving unit 12o and the MIM light emitting element driving unit 12m are white or the like according to a color mixture of light emission of a predetermined luminance of each corresponding element of various lighting modes of the organic EL device according to the luminance designation signal of each color from the control unit 11. Tones the light source color (light color). The light color white light is “color temperature” when the chromaticity is on the black body radiation locus indicated by the XYZ color system of the CIE chromaticity diagram, and “correlated color temperature” when the chromaticity is not within that range. Is represented.

The operation unit 13 is a device such as a remote controller including an open / close switch or a wired module attached in the room. The operation unit 13 supplies an operation command such as a command to turn on or off the mirror device by the user and a command to switch to a lighting mode such as normal illumination or nightlight to the control unit 11.

For example, by using color temperature luminance data of luminance values for each element group of the organic EL device, white light is emitted even if the normal lighting luminance of the entire mirror device is constant due to light emission color mixing of the R, G, B organic EL element groups. The color temperature can be controlled to change.

The color temperature luminance data includes a red driving unit 12Ro, a green driving unit 12Go, and a blue driving unit for emitting white light of various color temperatures of the organic EL device by mixing each corresponding element with light having a specific luminance. 12Bo and table data of luminance values (luminance designation signal) for each element group sent to the red driving unit 12Rm, the green driving unit 12Gm, and the blue driving unit 12Bm.

Based on the acquired color temperature luminance data, the control unit 11 changes the luminance of each corresponding element at a predetermined timing of compensation for the user's operation timing or aging change of the element group from the lower one of the color temperature steps to the higher one. The value is sent as a luminance designation signal to each of the red drive unit 12Ro, the green drive unit 12Go and the blue drive unit 12Bo, the red drive unit 12Rm, the green drive unit 12Gm, and the blue drive unit 12Bm. In this way, the control unit 11 sends the luminance designation signals that define white light having a desired color temperature to the red driving unit 12Ro, the green driving unit 12Go, the blue driving unit 12Bo, the red driving unit 12Rm, the green driving unit 12Gm, and the blue driving unit, respectively. It sends to the drive part 12Bm and controls the brightness | luminance of each corresponding | compatible element. Therefore, the control unit 11 can relatively change the luminance of the plurality of MIM light emitting elements and the luminance of the plurality of organic EL elements, so that the natural light of the organic EL element and the artificial light of the MIM light emitting element are interwoven. Thus, the light color of the organic EL device can be adjusted. The control unit 11 controls the light color and color temperature of the organic EL device by individually adjusting the light emission intensity (luminance) of each element group of the organic EL device, for example, a light bulb according to a user's operation. White light such as color and daylight color can be emitted, or white light can be finely corrected at a predetermined timing for compensating for secular change of a group of elements such as a ROM.

According to the organic EL device having the above configuration, by combining the luminescent colors, it is possible to perform toning that can stabilize the colors of various luminescent colors in addition to the change from warm white to cool white.

In this embodiment, as shown in the configuration diagram of FIG. 6, a signal is output from the control unit to the organic EL element driving unit 12o and the MIM light emitting element driving unit 12m. The color ratio can be changed. As a result, the user can select the desired brightness, hue, softness and hardness of the light emission at that time with a very thin light emitting mirror device.

<Second embodiment>
In the following, the second embodiment will be described mainly with respect to the differences from the first embodiment with reference to FIG. Elements indicated by the same reference numerals as those in the first embodiment are the same, and thus description thereof is omitted.

FIG. 7 shows a second embodiment having the same configuration as that of the first embodiment except that the MIM light emitting element is not formed on the translucent electrode 1 and the MIM light emitting element MIM is arranged in the upper recess of the transparent bank BK. Show. According to this, since the element is arranged inside the recess of the bank BK, the bus line MBL electrically connected to the translucent electrode 2 and the metal thin film MF of the cathode of the MIM light emitting element connected to the bus line MBL are connected to the bank. Can be protected with material. Furthermore, the metal thin film MF can be filled with an insulating material. Since the MIM light emitting element is constructed on or in the transparent bank BK, the degree of freedom in selecting the MIM light emitting element driving power source is increased. In the case of the second embodiment, the MIM light emitting element can be brought close to the organic EL element when viewed from the front.

<Third embodiment>
In the following, the third embodiment will be described mainly with respect to the differences from the first embodiment with reference to FIG. Elements indicated by the same reference numerals as those in the first embodiment are the same, and thus description thereof is omitted.

FIG. 8 shows a third embodiment having the same configuration as that of the first embodiment except that the organic EL element and the MIM light emitting element are arranged in a checkered pattern, that is, in a matrix shape instead of a stripe shape. Show. That is, in one direction (lateral), the red organic EL element Ro, the blue MIM light emitting element Bm, the green organic EL element Go, the red MIM light emitting element Rm, the blue organic EL element Bo, and the green MIM light emitting element Gm In the direction (vertical) intersecting the direction, the elements are arranged so as to have the same color when all light is emitted. According to this, when the checkerboard pattern is used, the horizontal direction is the vertical direction when the organic EL element and the MIM light emitting element emit light separately or at the same time, and the vertical direction is the simultaneous direction. The colors are aligned. Also in this case, the light emitters of the organic EL element and the MIM light emitting element are alternately arranged. The organic EL elements and the MIM light emitting elements juxtaposed in a matrix or stripe form are arranged so that they emit light at equal intervals, whether they emit light separately or simultaneously. Therefore, it is very easy to see the effect when facing the mirror device. Each element is not limited to a rectangular shape, and may be configured to have various shapes such as a circle and an ellipse.

In the above embodiment, the organic EL elements and the MIM elements are always arranged alternately. However, in the other embodiments, two organic EL elements (Ro, Ro) are arranged in a certain row as shown in FIG. A group of MIM light emitting elements and a group of organic EL elements are alternately arranged, such as two MIM elements (Bm, Bm) and then two organic EL elements (Go, Go). They may be arranged alternately in a group configuration.

In another embodiment, as shown in FIG. 10, a predetermined rule, for example, every two rows, two organic EL elements are diagonally arranged (Ro, Ro), and then two MIM elements are diagonally arranged (Bm, Bm). ) After that, two organic EL elements may be arranged diagonally (Go, Go).

Although not shown, when the area of each light emitting element is sufficiently smaller than the light emitting area composed of the organic EL element and the MIM element, the organic EL element and the MIM element may be randomly arranged.

<Fourth embodiment>
In the following, the fourth embodiment will be described mainly with respect to the differences from the second embodiment with reference to FIG.

FIG. 11 shows a mirror device including a transparent bank BK having a so-called reverse taper structure in which the taper of the transparent bank BK is narrowed toward the translucent electrode 1 instead of the forward taper structure of the bank. Elements indicated by the same reference numerals as those in the second embodiment having a so-called forward taper structure in which the taper of the transparent bank BK is widened toward the translucent electrode 1 are the same, and the description thereof is omitted.

In any of the above-described embodiments, a quartz or glass plate, a metal plate or metal foil, a bent resin substrate, a plastic film, a sheet, or the like is used as the translucent substrate 1. In particular, a glass plate or a transparent plate made of a synthetic resin such as polyester, polymethacrylate, polycarbonate, or polysulfone is preferable. When using a synthetic resin substrate, it is necessary to pay attention to gas barrier properties. If the gas barrier property of the substrate is too small, the organic EL device may be deteriorated by outside air that has passed through the substrate, which is not preferable. Therefore, a method of securing a gas barrier property by providing a dense silicon oxide film or the like on at least one surface of the synthetic resin substrate is also a preferable method.

In order to increase the output light extraction efficiency, a light extraction film (not shown) may be attached to the front surface of the substrate 1 so as to cover the light emitting portion.

Furthermore, in any of the above-described embodiments, the organic layer is a light emitting laminate, but the light emitting laminate can also be configured by laminating inorganic material films.

In any of the embodiments, for the purpose of protecting from oxygen and moisture in the atmosphere after the reflective electrode 4 is formed, the bank and the organic EL elements Ro, Go and Bo, and the MIM light emitting elements Rm, Gm and Sealing may be performed by adhering a sealing material (not shown) such as a cap made of metal or glass covering Bm. At this time, a desiccant (not shown) may be attached to the inner wall of the cap, or hermetic sealing with an inert gas is possible. Further, instead of sealing with an inert gas, liquid sealing using a light diffusing material such as oil that diffuses light by dispersing a plurality of fine particles in a liquid phase is also possible. Further, a so-called solid sealing may be performed by forming a sealing film (not shown) made of an organic compound or an inorganic compound so as to cover these constituent members.

Although the above embodiment has been described with a bottom emission structure light emitting element, in other embodiments, the same configuration as the above embodiment except that the light extraction direction is not the substrate side but the MIM light emitting element and organic EL element side. The top emission structure light emitting device shown in FIG. In addition, since the element shown with the same referential mark as said Example is the same, those description is abbreviate | omitted. In the case of a top emission structure light emitting element, the light emitting element can be formed on an opaque substrate in addition to the light transmitting substrate.

DESCRIPTION OF SYMBOLS 1 Substrate 2 Translucent electrode 3a Hole injection layer 3b Hole transport layer 3c Light emitting layer 3d Electron transport layer 3e Electron injection layer 3m Dielectric layer 3o Organic layer 4 Reflective electrode 11 Control unit 12 Drive unit 13 Operation unit BK Bank MBL Bus line
MF Metal thin film Ro, Go, Bo Organic EL element Rm, Gm, Bm MIM light emitting element

Claims

A mirror device having a plurality of light emitting elements carried on a substrate,
The plurality of light emitting elements are a plurality of metal-dielectric-metal light emitting elements (MIM light emitting elements) and a plurality of organic EL elements, each of the MIM light emitting elements and the organic EL elements or a group of the MIM light emitting elements. And each of a group of the organic EL elements is alternately arranged on the substrate.
Each of the organic EL elements includes an organic layer sandwiched between a translucent electrode and a reflective electrode, and emits light with a first spectral distribution when an electric field is applied,
Each of the MIM light emitting elements includes an organic layer sandwiched between a first metal electrode and a second metal electrode, and emits light with a second spectral distribution different from the first spectral distribution when an electric field is applied. The mirror device according to claim 1.
3. The mirror device according to claim 2, wherein the second spectral distribution has a narrower wavelength bandwidth than the first spectral distribution.
Each of the MIM light emitting element and the organic EL element has a strip shape, and the plurality of MIM light emitting elements and the plurality of organic EL elements are juxtaposed in a stripe shape at regular intervals. Item 3. The mirror device according to Item 2.
When each of the MIM light emitting element and the organic EL element exhibits a plurality of light emission colors, the plurality of MIM light emitting elements and the plurality of organic EL elements are juxtaposed in a matrix at regular intervals, The organic EL elements are alternately arranged so as to have different emission colors in one direction juxtaposed in a matrix, and are arranged so as to have the same emission color in a direction crossing the one direction. The mirror device according to claim 2, wherein:
An organic EL element driving section and an MIM light emitting element driving section for driving the plurality of MIM light emitting elements and the plurality of organic EL elements, respectively; a control section for controlling the organic EL element driving section and the MIM light emitting element driving section; The mirror apparatus according to claim 2, further comprising: the control unit relatively changing a luminance of the plurality of MIM light emitting elements and a luminance of the plurality of organic EL elements.
3. The mirror device according to claim 2, further comprising an insulating and translucent bank formed on the translucent electrode and partitioning each of the MIM light emitting element and the organic EL element.
The mirror device according to claim 7, wherein each of the MIM light emitting elements is formed on the bank.