JP2011065773A - Organic electroluminescent device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic electroluminescent device capable of improving viewing angle characteristics while maintaining superb front-face brightness and light extraction efficiency. <P>SOLUTION: The organic electroluminescent device, having at least an organic electroluminescent part containing at least a light-emitting layer, and a hemispherical lens controlling an optical path of light emitted from the light-emitting layer, includes a plurality of organic electroluminescent parts having a plurality of pixels each containing a red subpixel, a green subpixel and a blue subpixel, and corresponding to each of the subpixel of the pixel, and a plurality of hemispherical lenses arranged on each of the light-emitting layers of the organic electroluminescent parts. A diameter of one of the plurality of hemispherical lenses is to be different from that of another hemispherical lens adjoining to the above hemispherical lens. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an organic electroluminescent device (hereinafter also referred to as “organic EL device”, “organic EL display device”, and “organic electroluminescent display device”).

  An organic electroluminescent device is a self-luminous display device, and is used for displays and illumination. The organic EL display has advantages in display performance such as higher visibility than conventional CRTs and LCDs and no viewing angle dependency. There is also an advantage that the display can be reduced in weight and thickness.

In such an organic electroluminescent device, in order to improve the light extraction efficiency, the light of a lens or the like that controls the optical path of the light emitted from the light emitting layer and emits the light emitted from the light emitting layer from the light extraction surface side. Various organic electroluminescent devices have been proposed in which an extraction member is disposed on the optical path. (See Patent Documents 1 and 2).
However, in these proposals, as shown in FIGS. 1 and 2, there is only a configuration in which hemispherical lenses are arranged on the light emitting surface, and no consideration is given to the positional relationship of hemispherical lenses in adjacent subpixels (subpixels). It has not been. Therefore, as shown in FIG. 1, a hemispherical lens on another subpixel (G) adjacent to light of 60 ° or less from a perpendicular passing through the center of the hemispherical lens 2 installed on one subpixel (R). 2 enters the shadow of the hemispherical lens 2 on the adjacent sub-pixel (G), and there is a problem that the viewing angle characteristic is deteriorated. In this case, it is conceivable not to arrange a hemispherical lens on the adjacent subpixel, but there is a problem that the light extraction efficiency is lowered even if the viewing angle characteristics are improved.
In addition, in a plurality of pixels, the area of the red sub-pixel in one pixel and the area of the red sub-pixel in another pixel adjacent to the one pixel are different from each other, or the area of the green sub-pixel in one pixel and the one If the area of the green sub-pixel in another pixel adjacent to the pixel is different from the area of the blue sub-pixel in one pixel and the area of the blue sub-pixel in another pixel adjacent to the one pixel There is a problem in that the front luminance differs from pixel to pixel.

  Therefore, at present, it is desired to provide an organic electroluminescent device capable of improving viewing angle characteristics while maintaining good front luminance and light extraction efficiency.

JP 2003-31353 A JP 2004-47298 A

  An object of the present invention is to solve the conventional problems and achieve the following objects. That is, an object of the present invention is to provide an organic electroluminescent device capable of improving viewing angle characteristics while maintaining good front luminance and light extraction efficiency.

Means for solving the problems are as follows. That is,
<1> An organic electroluminescent device having at least an organic electroluminescent part including at least a light emitting layer and a hemispherical lens for controlling an optical path of light emitted from the light emitting layer,
The organic electroluminescence device includes a plurality of pixels including a red subpixel, a green subpixel, and a blue subpixel, a plurality of organic electroluminescence units corresponding to the subpixels of the pixel, and the organic electroluminescence unit A plurality of hemispherical lenses disposed on each light emitting layer,
The organic electroluminescent device is characterized in that a diameter of one hemispherical lens among the plurality of hemispherical lenses is different from a diameter of another hemispherical lens adjacent to the one hemispherical lens.
<2> A lens assembly in which the diameter of one hemispherical lens is larger than the diameter of another hemispherical lens adjacent to the one hemispherical lens, and the other hemispherical lens is composed of a plurality of hemispherical lenses. The organic electroluminescence device according to <1>.
<3> The organic electroluminescent device according to <2>, wherein the lens assembly includes 4 to 25 hemispherical lenses.
<4> The area of the red sub-pixel in one pixel of the plurality of pixels and the area of the red sub-pixel in another pixel adjacent to the one pixel are substantially the same,
The area of the green subpixel in one pixel of the plurality of pixels and the area of the green subpixel in another pixel adjacent to the one pixel are substantially the same,
Any one of <1> to <3>, wherein an area of a blue subpixel in one pixel of the plurality of pixels and an area of a blue subpixel in another pixel adjacent to the one pixel are substantially the same. It is an organic electroluminescent apparatus of description.
<5> The red subpixel in the other pixel is a red subpixel aggregate including a plurality of organic electroluminescence units, and the area of the red subpixel in one pixel and the total area of the red subpixel in the red subpixel aggregate Are substantially identical,
The green subpixel in the other pixel is a green subpixel aggregate including a plurality of organic electroluminescence units, and the area of the green subpixel in one pixel and the total area of the green subpixel in the green subpixel aggregate are approximately Are the same,
The blue subpixel in the other pixel is a blue subpixel aggregate composed of a plurality of organic electroluminescence units, and the area of the blue subpixel in one pixel and the total area of the blue subpixel in the blue subpixel aggregate are approximately The organic electroluminescence device according to <4>, which is the same.
<6> The organic electroluminescence device according to <5>, wherein each color sub-pixel assembly includes 4 to 25 organic electroluminescence units.
<7> The ratio (φ / d) between the diameter φ of one hemispherical lens and the maximum length d of one side of the light emitting layer in one organic electroluminescent portion;
The diameter φ ′ of each hemispherical lens in a lens assembly as another hemispherical lens adjacent to the one hemispherical lens, and a subpixel as another organic electroluminescent part adjacent to the one organic electroluminescent part The ratio (φ ′ / d ′) to the maximum length d ′ of one side of each light emitting layer in the aggregate is expressed by the following formula: 0.9 <(φ / d) / (φ ′ / d ′) <1 .1 is an organic electroluminescence device according to any one of <5> to <6>.

  ADVANTAGE OF THE INVENTION According to this invention, the problem in the past can be solved and the organic electroluminescent apparatus which can improve a viewing angle characteristic can be provided, maintaining favorable front luminance and light extraction efficiency.

FIG. 1 is a side view showing an example of a conventional organic electroluminescent device. FIG. 2 is a plan view of FIG. FIG. 3 is a schematic cross-sectional view showing an example of a bottom emission type organic electroluminescence device. FIG. 4 is a schematic cross-sectional view showing an example of a top emission type organic electroluminescence device. FIG. 5A is a process diagram illustrating an example of a method for manufacturing an organic electroluminescent device. FIG. 5B is a process diagram illustrating an example of a method for manufacturing an organic electroluminescent device. FIG. 5C is a process diagram illustrating an example of a method for manufacturing an organic electroluminescent device. FIG. 5D is a process diagram illustrating an example of a method of manufacturing an organic electroluminescent device. FIG. 5E is a process diagram illustrating an example of a method for manufacturing an organic electroluminescent device. FIG. 5F is a process diagram illustrating an example of a method of manufacturing an organic electroluminescent device. FIG. 6 is a side view showing an example of the organic electroluminescent device according to the first embodiment of the present invention. FIG. 7 is a plan view showing an example of the organic electroluminescent device according to the first embodiment of the present invention. FIG. 8 is a plan view showing another example of the organic electroluminescent device according to the first embodiment of the present invention. FIG. 9 is a plan view showing another example of the organic electroluminescent device according to the first embodiment of the present invention. FIG. 10 is a side view showing an example of an organic electroluminescent device according to the second embodiment of the present invention. FIG. 11 is a plan view showing an example of an organic electroluminescent device according to the second embodiment of the present invention. FIG. 12 is a plan view showing another example of the organic electroluminescent device according to the second embodiment of the present invention. FIG. 13 is a plan view showing another example of the organic electroluminescent device according to the second embodiment of the present invention. FIG. 14 is a side view showing an example of an organic electroluminescent device according to the third embodiment of the present invention. FIG. 15 is a plan view showing an example of an organic electroluminescent device according to the third embodiment of the present invention. FIG. 16 is a plan view showing another example of the organic electroluminescent device according to the third embodiment of the present invention. FIG. 17 is a plan view showing another example of the organic electroluminescent device according to the third embodiment of the present invention. FIG. 18 is a side view showing an example of the organic electroluminescent device of Comparative Example 2. FIG. 19 is a front view showing an example of the organic electroluminescent device of Comparative Example 2.

  The organic electroluminescent device of the present invention has an organic electroluminescent portion including at least a light emitting layer, and a hemispherical lens for controlling the optical path of light emitted from the light emitting layer, and further has other configurations as necessary. Have.

In the present invention, the organic electroluminescent device has a plurality of pixels including a red (R) subpixel, a green (G) subpixel, and a blue (B) subpixel, and corresponds to each subpixel of the pixel. A plurality of organic electroluminescent portions; and a plurality of hemispherical lenses disposed on each light emitting layer of the organic electroluminescent portions.
As a configuration of such a pixel including a red (R) subpixel, a green (B) subpixel, and a blue (B) subpixel, for example, described in “Monthly Display”, September 2000, pages 33-37. As described above, the light emitting layer is formed as a light emitting layer that emits light corresponding to red, green, or blue, and a subpixel is formed, and any one of these red, green, and blue is formed. A known configuration such as a three-color light emission method in which subpixels are arranged can be applied.

One hemispherical lens is disposed on the light emitting layer of one organic electroluminescent unit.
A diameter of one hemispherical lens among the plurality of hemispherical lenses is different from a diameter of another hemispherical lens adjacent to the one hemispherical lens. Thereby, the viewing angle characteristic can be improved.
The diameter of the one hemispherical lens is larger than the diameter of another hemispherical lens adjacent to the one hemispherical lens, and the other hemispherical lens is a lens assembly including a plurality of hemispherical lenses. Is preferable in terms of improving viewing angle characteristics.
The lens assembly preferably has 4 to 25 hemispherical lenses. If the number of the hemispherical lenses is less than 4, the difference in diameter from the hemispherical lens on the adjacent subpixel may be reduced, and the viewing angle improvement effect may be reduced. Depending on the size, formation may be difficult.

The hemispherical lens has a function of controlling an optical path of light emitted from the light emitting layer.
The hemispherical lens is formed on a sealing layer that covers the cathode surface of the organic electroluminescent portion.

Examples of the arrangement of the hemispherical lenses include a square lattice shape and a honeycomb shape.
Examples of the material of the hemispherical lens include transparent resin, glass, transparent crystal, and transparent ceramic.
The effective diameter of the hemispherical lens is preferably 10 μm to 1,000 μm, more preferably 20 μm to 200 μm.
The refractive index of the hemispherical lens is preferably 1.4 to 2.1, and more preferably 1.5 to 1.8.

In the present invention, (1) the area of the red subpixel in one pixel of the plurality of pixels and the area of the red subpixel in another pixel adjacent to the one pixel may be substantially the same. preferable. Here, “substantially the same” means that the difference in area is within ± 10%.
In this case, the red subpixel in the other pixel is a red subpixel aggregate including a plurality of organic electroluminescence units, and the total area of the red subpixel in the red subpixel aggregate and the area of the red subpixel in the one pixel. Are more preferably substantially the same in terms of maintaining the front luminance for each pixel.
(2) It is preferable that the area of the green subpixel in one pixel of the plurality of pixels and the area of the green subpixel in another pixel adjacent to the one pixel are substantially the same. Here, “substantially the same” means that the difference in area is within ± 10%.
In this case, the green subpixel in the other pixel is a green subpixel aggregate including a plurality of organic electroluminescence units, and the total area of the green subpixel in the one pixel and the green subpixel in the green subpixel aggregate. Are more preferably substantially the same in terms of maintaining the front luminance for each pixel.
(3) It is preferable that the area of the blue subpixel in one pixel of the plurality of pixels is substantially the same as the area of the blue subpixel in another pixel adjacent to the one pixel. Here, “substantially the same” means that the difference in area is within ± 10%.
In this case, the blue subpixel in the other pixel is a blue subpixel aggregate including a plurality of organic electroluminescence units, and the total area of the blue subpixel in the one pixel and the blue subpixel in the blue subpixel aggregate. Are more preferably substantially the same in terms of maintaining the front luminance for each pixel.

It is preferable that each color sub-pixel assembly has 4 to 25 organic electroluminescence units.
Note that the area of the red subpixel, the area of the green subpixel, and the area of the blue subpixel in the same pixel may be different.

Here, the ratio (φ / d) between the diameter φ of one hemispherical lens and the maximum length d of one side of the light emitting layer in one organic electroluminescent portion,
The diameter φ ′ of each hemispherical lens of the lens assembly as another hemispherical lens adjacent to the one hemispherical lens, and a subpixel as another organic electroluminescent part adjacent to the one organic electroluminescent part The ratio (φ ′ / d ′) to the maximum length d ′ of one side of each light emitting layer of the aggregate is expressed by the following formula: 0.9 <(φ / d) / (φ ′ / d ′) <1 0.1, 0.95 <(φ / d) / (φ ′ / d ′) <1.05, more preferably (φ / d) / (φ ′ / d ′). Most preferred is 1. That is, it is preferable that one hemispherical lens and the light emitting layer have similar shapes to the other hemispherical lenses and the light emitting layer in order to improve the viewing angle characteristics while maintaining the front luminance and the light extraction efficiency.

  There is no restriction | limiting in particular as a magnitude | size of the said light emitting layer, Although it can select suitably according to the objective, 1 micrometer-10,000 micrometers are preferable, 5 micrometers-500 micrometers are more preferable, 10 micrometers-100 micrometers are especially preferable.

  Here, with reference to drawings, the organic electroluminescent apparatus which concerns on the 1st-3rd embodiment of this invention is demonstrated.

<First Embodiment>
The organic electroluminescent device according to the first embodiment has one hemispherical lens and one hemispherical lens as shown in a side view of FIG. 6 and a plan view of FIGS. 7, 8, and 9, respectively. Another hemispherical lens adjacent is a lens assembly composed of four hemispherical lenses, and one organic electroluminescence part and another organic electroluminescence part adjacent to the one organic electroluminescence part are four organic electroluminescences. This is a sub-pixel assembly composed of parts.
For example, for one red (R) light emitting layer, four green (G) light emitting layers adjacent to the red light emitting layer, and one blue (B) light emitting layer, a hemispherical lens is provided on each light emitting layer. Has been placed.
In the first embodiment, light of 70.5 ° or less from a perpendicular passing through the center of one hemispherical lens enters another adjacent hemispherical lens, and the viewing angle characteristics are improved.
Although not shown, one pixel including the one red (R) subpixel, four green (G) subpixels, one blue (B) subpixel, and the one pixel. The total area of the four green sub-pixels and the area of one green sub-pixel in another pixel adjacent to the one pixel are substantially the same. In addition, the area of the red subpixel in one pixel is substantially the same as the area of the red subpixel in the other pixel. Further, the area of the blue subpixel in one pixel is substantially the same as the area of the blue subpixel in the other pixel. Thereby, there is no difference in front luminance between pixels.

<Second Embodiment>
The organic electroluminescent device of the second embodiment has one hemispherical lens and one hemispherical lens as shown in FIG. 10 in a side view and in FIGS. 11, 12 and 13 in plan views. Another hemispherical lens adjacent is a lens assembly composed of nine hemispherical lenses, and one organic electroluminescence part and another organic electroluminescence part adjacent to the one organic electroluminescence part are nine organic electroluminescences. This is a sub-pixel assembly composed of parts.
For example, for one red (R) light emitting layer, nine green (G) light emitting layers adjacent to the red light emitting layer, and one blue (B) light emitting layer, a hemispherical lens is provided on each light emitting layer. Has been placed.
In the second embodiment, light of 75 ° or less from a perpendicular passing through the center of one hemispherical lens enters another adjacent hemispherical lens, and the viewing angle characteristics are improved.
Although not shown in the figure, one pixel including the one red (R) subpixel, nine green (G) subpixels, one blue (B) subpixel, and the one pixel. The total area of the nine green sub-pixels and the area of one green sub-pixel in another pixel adjacent to the one pixel are substantially the same. In addition, the area of the red subpixel in one pixel is substantially the same as the area of the red subpixel in the other pixel. Further, the area of the blue subpixel in one pixel is substantially the same as the area of the blue subpixel in the other pixel. Thereby, there is no difference in front luminance between pixels.

<Third Embodiment>
The organic electroluminescent device of the third embodiment has one hemispherical lens and one hemispherical lens as shown in FIG. 14 in a side view and in FIG. 15, FIG. 16, and FIG. Another adjacent hemispherical lens is a lens assembly composed of 25 hemispherical lenses, and one organic electroluminescent part and another organic electroluminescent part adjacent to the one organic electroluminescent part are 25 organics. This is a sub-pixel assembly composed of an electroluminescence unit.
For example, a hemispherical lens is provided on each light emitting surface for one red (R) light emitting layer, 25 green (G) light emitting layers adjacent to the red light emitting layer, and one blue (B) light emitting layer. Each is arranged.
In the third embodiment, light of 80 ° or less from a perpendicular passing through the center of one hemispherical lens enters another adjacent hemispherical lens, and the viewing angle characteristics are improved.
Although not shown in the drawing, the one red (R) subpixel, one green (G) subpixel, one blue (B) subpixel, The total area of the 25 green subpixels in the pixel is substantially the same as the area of one green subpixel in another pixel adjacent to the one pixel. In addition, the area of the red subpixel in one pixel is substantially the same as the area of the red subpixel in the other pixel. Further, the area of the blue subpixel in one pixel is substantially the same as the area of the blue subpixel in the other pixel. Thereby, there is no difference in front luminance between pixels.

<< Organic electroluminescence part >>
The organic electroluminescent portion has at least an anode, a light emitting layer, and a cathode, and may have a hole injection layer, a hole transport layer, an electron injection layer, an electron transport layer, and the like as necessary. Each of these layers may have other functions. Various materials can be used for forming each layer.

-Anode-
The anode supplies holes to a hole injection layer, a hole transport layer, a light emitting layer, and the like, and a metal, an alloy, a metal oxide, an electrically conductive compound, or a mixture thereof can be used. The material preferably has a work function of 4 eV or more. Specific examples include conductive metal oxides such as tin oxide, zinc oxide, indium oxide and indium tin oxide (ITO), metals such as gold, silver, chromium and nickel, and these metals and conductive metal oxides. And an inorganic conductive substance such as copper iodide and copper sulfide, an organic conductive material such as polyaniline, polythiophene, and polypyrrole, or a laminate of these with ITO. Among these, a conductive metal oxide is preferable, and ITO is particularly preferable in terms of productivity, high conductivity, transparency, and the like.
There is no restriction | limiting in particular in the thickness of the said anode, Although it can select suitably by material, 10 nm-5 micrometers are preferable, 50 nm-1 micrometer are more preferable, 100 nm-500 nm are still more preferable.

As the anode, a layer formed on a soda-lime glass, non-alkali glass, a transparent resin substrate or the like is usually used. When glass is used, it is preferable to use non-alkali glass as the material in order to reduce ions eluted from the glass. Moreover, when using soda-lime glass, it is preferable to use what gave barrier coatings, such as a silica.
The thickness of the substrate is not particularly limited as long as it is sufficient to maintain mechanical strength, but when glass is used, it is preferably 0.2 mm or more, and more preferably 0.7 mm or more.

  A barrier film can also be used as the transparent resin substrate. The barrier film is a film in which a gas impermeable barrier layer is provided on a plastic support. As the barrier film, a film in which silicon oxide or aluminum oxide is vapor-deposited (Japanese Patent Publication No. 53-12953, Japanese Patent Laid-Open No. 58-217344), an organic-inorganic hybrid coating layer (Japanese Patent Laid-Open No. 2000-323273, JP-A-2004-25732), those having an inorganic layered compound (JP-A-2001-205743), laminates of inorganic materials (JP-A-2003-206361, JP-A-2006-263389), organic Layer and inorganic layer laminated alternately (Japanese Patent Laid-Open No. 2007-30387, US Pat. No. 6,436,645, Affinito et al., Thin Solid Films 1996, pages 290-291), organic layer and inorganic layer continuously A laminate (US Patent Application Publication No. 2004-46497) and the like can be mentioned.

  Various methods are used for the production of the anode. For example, in the case of ITO, electron beam method, sputtering method, resistance heating vapor deposition method, chemical reaction method (sol-gel method, etc.), dispersion of indium tin oxide A film is formed by a method such as application of an object. The anode can be subjected to cleaning or other processing to lower the driving voltage of the display device or to increase the light emission efficiency. For example, in the case of ITO, ozone treatment with UV is effective.

-Cathode-
The cathode supplies electrons to an electron injection layer, an electron transport layer, a light emitting layer, and the like. Adhesion between the cathode and adjacent layers such as an electron injection layer, an electron transport layer, and a light emitting layer, ionization potential, and stability It is selected in consideration of sex and the like.
As the material of the cathode, a metal, an alloy, a metal oxide, an electrically conductive compound, or a mixture thereof can be used. Specific examples thereof include alkali metals (for example, Li, Na, K, etc.) or fluorides thereof, Alkaline earth metals (eg Mg, Ca, etc.) or fluorides thereof, gold, silver, lead, aluminum, sodium-potassium alloys or mixed metals thereof, lithium-aluminum alloys or mixed metals thereof, magnesium-silver alloys or those thereof And a rare earth metal such as indium and ytterbium. Among these, a material having a work function of 4 eV or less is preferable, and aluminum, a lithium-aluminum alloy or a mixed metal thereof, a magnesium-silver alloy or a mixed metal thereof is particularly preferable.

There is no restriction | limiting in particular in the thickness of the said cathode, Although it can select suitably by material, 10 nm-5 micrometers are preferable, 50 nm-1 micrometer are more preferable, 100 nm-1 micrometer are still more preferable.
For the production of the cathode, for example, an electron beam method, a sputtering method, a resistance heating vapor deposition method, a coating method or the like is used, and a metal can be vapor-deposited alone or two or more components can be vapor-deposited simultaneously. Furthermore, a plurality of metals can be vapor-deposited simultaneously to form an alloy electrode, or a pre-adjusted alloy may be vapor-deposited.
The sheet resistance of the anode and cathode is preferably low, and is preferably several hundred Ω / □ or less.

-Light emitting layer-
The material of the light emitting layer is not particularly limited and may be appropriately selected depending on the purpose. Holes can be injected from the anode, the hole injection layer, or the hole transport layer when an electric field is applied, and the cathode Alternatively, a layer having the function of injecting electrons from the electron injection layer, the electron transport layer, the function of moving the injected charge, and the function of emitting light by providing a field for recombination of holes and electrons is formed. What can be used can be used.

The material for the light emitting layer is not particularly limited and may be appropriately selected depending on the purpose. For example, the light emitting layer may be composed of only the light emitting material, or a mixture of the host material and the light emitting material. A layered configuration may also be used.
The light emitting material is not particularly limited, and may be a fluorescent material or a phosphorescent material, or two or more kinds, but preferably contains at least one phosphorescent material.

There is no restriction | limiting in particular as said phosphorescent material, According to the objective, it can select suitably, The complex containing a transition metal atom or a lanthanoid atom can be mentioned.
The transition metal atom is not particularly limited and may be appropriately selected depending on the purpose, but is preferably ruthenium, rhodium, palladium, tungsten, rhenium, osmium, iridium, gold, silver, copper, platinum, rhenium, Iridium and platinum are more preferable, and iridium and platinum are particularly preferable.
The lanthanoid atom is not particularly limited and may be appropriately selected depending on the intended purpose. Is mentioned. Among these, neodymium, europium, and gadolinium are particularly preferable.

The host material is preferably a charge transport material.
The host material may be of one type or two or more types, and examples thereof include a configuration in which an electron transporting host material and a hole transporting host material are mixed. Furthermore, the light emitting layer may contain a material that does not have charge transporting properties and does not emit light.
Moreover, the said light emitting layer may be 1 layer, or may be two or more layers, and each layer may light-emit with a different luminescent color.

With the light emitting layer material, a red light emitting layer, a green light emitting layer, and a blue light emitting layer can be formed.
Examples of the red light-emitting layer include CBP (4,4′-N, N′-dicarbazole-biphenyl) represented by the following formula as a charge transport material, and a dopant A represented by the following formula as a phosphorescent material. Can be formed by co-evaporation.

Examples of the green light emitting layer include mCP (1,3-bis (carbazol-9-yl) benzene) represented by the following formula as a charge transport material and Ir (ppy) represented by the following formula as a phosphorescent material. ₃ ) It can be formed by co-evaporating (tris (2-phenylpyridineiridium)).

  As the blue light emitting layer, for example, mCP (1,3-bis (carbazol-9-yl) benzene) represented by the following formula as a charge transporting material and Firpic (iridium) represented by the following formula as a phosphorescent material are used. (III) Bis [(4,6-difluorophenyl) -pyridinate-N, C2] picolinate) can be co-evaporated.

The method for forming the light emitting layer is not particularly limited and may be appropriately selected depending on the purpose. For example, resistance heating vapor deposition, electron beam, sputtering, molecular lamination method, coating method (spin coating method, casting method, dip coating) Method) and LB method. Among these, resistance heating vapor deposition and a coating method are particularly preferable.
There is no restriction | limiting in particular in the thickness of the said light emitting layer, According to the objective, it can select suitably, 1 nm-5 micrometers are preferable, 5 nm-1 micrometer are more preferable, 10 nm-500 nm are still more preferable.

-Hole injection layer, hole transport layer-
The material of the hole injection layer and the hole transport layer has any one of a function of injecting holes from the anode, a function of transporting holes, and a function of blocking electrons injected from the cathode. If it is, there will be no restriction | limiting in particular, According to the objective, it can select suitably.
Examples of the material for the hole injection layer and the hole transport layer include carbazole derivatives, triazole derivatives, oxazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives, pyrazolone derivatives, phenylenediamine derivatives, arylamines. Derivatives, amino-substituted chalcone derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, stilbene derivatives, silazane derivatives, aromatic tertiary amine compounds, styrylamine compounds, aromatic dimethylidin compounds, porphyrin compounds, polysilane compounds, poly Examples thereof include (N-vinylcarbazole) derivatives, aniline copolymers, thiophene oligomers, and conductive polymer oligomers such as polythiophene. These may be used individually by 1 type and may use 2 or more types together.

The hole injection layer and the hole transport layer may have a single-layer structure composed of one or more of the materials described above, or a multilayer structure composed of a plurality of layers having the same composition or different compositions. Good.
As a method for forming the hole injection layer and the hole transport layer, for example, a vacuum deposition method, an LB method, a method in which the hole injection / transport agent is dissolved or dispersed in a solvent (a spin coating method, a casting method, a dip method). Coating method). In the case of the coating method, it can be dissolved or dispersed together with the resin component.
The resin component is not particularly limited and may be appropriately selected depending on the intended purpose. For example, polyvinyl chloride resin, polycarbonate resin, polystyrene resin, polymethyl methacrylate resin, polybutyl methacrylate resin, polyester resin, polysulfone resin , Polyphenylene oxide resin, polybutadiene, poly (N-vinylcarbazole) resin, hydrocarbon resin, ketone resin, phenoxy resin, polyamide resin, ethyl cellulose, vinyl acetate resin, ABS resin, polyurethane resin, melamine resin, unsaturated polyester resin, alkyd Resin, epoxy resin, silicone resin, etc. are mentioned. These may be used individually by 1 type and may use 2 or more types together.
The thicknesses of the hole injection layer and the hole transport layer are not particularly limited and may be appropriately selected depending on the purpose. For example, 1 nm to 5 μm is preferable, 5 nm to 1 μm is more preferable, and 10 nm to 500 nm is still more preferable. .

-Electron injection layer, electron transport layer-
As a material for the electron injection layer and the electron transport layer, any material may be used as long as it has any one of the function of injecting electrons from the cathode, the function of transporting electrons, and the function of blocking holes injected from the anode. There is no restriction | limiting, According to the objective, it can select suitably.
Examples of the material for the electron injection layer and the electron transport layer include triazole derivatives, oxazole derivatives, oxadiazole derivatives, fluorenone derivatives, anthraquinodimethane derivatives, anthrone derivatives, diphenylquinone derivatives, thiopyrandioxide derivatives, carbodiimide derivatives, Metal complexes of fluorenylidenemethane derivatives, distyrylpyrazine derivatives, heterocyclic tetracarboxylic anhydrides such as naphthaleneperylene, phthalocyanine derivatives, 8-quinolinol derivatives, metal phthalocyanines, benzoxazole and benzothiazole ligands And various metal complexes represented by These may be used individually by 1 type and may use 2 or more types together.

The electron injection layer and the electron transport layer may have a single layer structure made of one or more of the materials described above, or may have a multilayer structure made of a plurality of layers having the same composition or different compositions.
As a method for forming the electron injection layer and the electron transport layer, for example, a vacuum deposition method, an LB method, a method in which the electron injection / transport agent is dissolved or dispersed in a solvent (a spin coating method, a casting method, a dip coating method, etc.) ) Etc. are used. In the case of the coating method, it can be dissolved or dispersed together with the resin component, and examples of the resin component include those exemplified in the case of the hole injection layer or the hole transport layer.
There is no restriction | limiting in particular in the thickness of the said electron injection layer or an electron carrying layer, According to the objective, it can select suitably, 1 nm-5 micrometers are preferable, 5 nm-1 micrometer are more preferable, 10 nm-500 nm are still more preferable.

--- Sealing layer--
The sealing layer is not particularly limited as long as it has a function of preventing permeation of oxygen, moisture, nitrogen oxides, sulfur oxides, ozone and the like in the atmosphere, and can be appropriately selected depending on the purpose.
There is no restriction | limiting in particular as a material of the said sealing layer, According to the objective, it can select suitably, For example, SiN, SiON, etc. are mentioned.
There is no restriction | limiting in particular as thickness of the said sealing layer, Although it can select suitably according to the objective, 5 nm-1,000 nm are preferable, 7 nm-750 nm are more preferable, 10 nm-500 nm are especially preferable. When the thickness of the sealing layer is less than 5 nm, the barrier function for preventing the permeation of oxygen and moisture in the atmosphere may be insufficient. When the thickness exceeds 1,000 nm, the light transmittance decreases and the transparent layer is transparent. Sexuality may be impaired.
As for the optical properties of the sealing layer, the light transmittance is preferably 80% or more, more preferably 85% or more, and still more preferably 90% or more.
There is no restriction | limiting in particular as a formation method of the said sealing layer, According to the objective, it can select suitably, For example, CVD method, a vacuum evaporation method, etc. are mentioned.

--Board--
The substrate may be appropriately selected in its shape, structure, size, etc. In general, the substrate is preferably plate-shaped. The structure of the substrate may be a single layer structure, a laminated structure, may be formed of a single member, or may be formed of two or more members. The substrate may be colorless and transparent or colored and transparent, but is preferably colorless and transparent in that it does not scatter or attenuate light emitted from the light emitting layer.

  The material for the substrate is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include inorganic materials such as yttria-stabilized zirconia (YSZ) and glass; polyethylene terephthalate resin, polybutylene phthalate resin, polyethylene naphthalate. Examples thereof include polyester resins such as resins, organic materials such as polystyrene resins, polycarbonate resins, polyethersulfone resins, polyarylate resins, polyimide resins, polycycloolefin resins, norbornene resins, and poly (chlorotrifluoroethylene) resins. These may be used individually by 1 type and may use 2 or more types together.

  When glass is used as the substrate, it is preferable to use non-alkali glass as the material in order to reduce ions eluted from the glass. Moreover, when using soda-lime glass, it is preferable to use what gave barrier coatings, such as a silica (for example, barrier film board | substrate). In the case of an organic material, it is preferable that it is excellent in heat resistance, dimensional stability, solvent resistance, electrical insulation, and workability.

  When the thermoplastic substrate is used, a hard coat layer, an undercoat layer, or the like may be further provided as necessary.

In the present invention, the organic electroluminescent part may form a microcavity structure in that the color purity can be increased.
Here, the macrocavity structure means a structure in which the semi-transmission layer on the light emission side interferes with the reflective electrode layer on the opposite side to the light emission.

Here, the optical length (optical distance) L of the microcavity structure is expressed by L = 2 × Σn _i d _i (where i is an integer from 1 to i in the number of stacked layers) and a phase shift due to reflection. The sum of the products of the thickness d of each layer formed between the anode and the cathode and the refractive index n of that layer.
The optical length L is related to the emission wavelength λ by the optical length L (λ) = mλ (m = 1: 1, m = 2: secondary, m = 3: 3rd), and the optical length L (λ) is represented by the following mathematical formula.
Where L (λ) is the optical length [= 2Σn _j d _j + ΣABS (φmiλ / 2π)], λ is the emission wavelength, i is a suffix indicating the metal reflective layer, and j is other than the metal reflective layer. A suffix indicating a layer (an organic layer, a dielectric layer, etc.) between metal layers is represented.

  Examples of the structure of the organic electroluminescence unit include a bottom emission type and a top emission type.

The bottom emission type or top emission type structure will be described with reference to the drawings.
Here, FIG. 3 is a schematic cross-sectional view showing a bottom emission type organic electroluminescent device which is an example of the organic electroluminescent device of the present invention. FIG. 4 is a schematic cross-sectional view showing a top emission type organic electroluminescent device which is an example of the organic electroluminescent device of the present invention.

The bottom emission type organic electroluminescent device 100 of FIG. 3 has an organic electroluminescent unit 101 (anode 12, hole injection layer 13, hole transport layer 14, light emitting layer 15, electron transport layer 16, electron injection on a glass substrate 11. The hemispherical lens 30 is formed on the glass substrate 11 as a light extraction surface.
The top emission type organic electroluminescent device 200 of FIG. 4 is formed on a glass substrate 11 with an organic electroluminescent unit 201 (anode 12, hole injection layer 13, hole transport layer 14, light emitting layer 15, electron transport layer 16, electron injection). A sealing layer 19 is formed on the cathode 18, and a hemispherical lens 30 is formed on the sealing layer 19 as a light extraction surface.
The “light emission direction” indicates a direction in which light from the light emitting layer is emitted from the light extraction surface to the outside of the organic electroluminescence device. In the case of the bottom emission type organic electroluminescent device 100 shown in FIG. 3, as indicated by an arrow, the direction from the light emitting layer 15 toward the lower side in parallel with the drawing is shown. In the case of the top emission type organic electroluminescent device 200 shown in FIG. 4, as indicated by an arrow, the direction from the light emitting layer 15 toward the upper side in parallel with the drawing is shown.

  As a method of making the organic electroluminescent device of a full color type, for example, a layer structure that emits light corresponding to three primary colors (blue (B), green (G), and red (R)) is formed on a substrate. And a three-color light emission method arranged in the above.

<Method for manufacturing organic electroluminescent device>
The manufacturing method of the organic electroluminescent device includes a step of forming a hemispherical lens on at least the light emitting layer, and includes other steps as necessary.

  There is no restriction | limiting in particular as a formation method of the said hemispherical lens, Although it can select suitably according to the objective, For example, cutting, grinding | polishing, the inkjet method, the imprint method, the photolithographic method etc. are mentioned.

  As the imprint method, a mold structure having a concave portion corresponding to the shape and arrangement pattern of a hemispherical lens disposed on a rectangular pixel region by using a composition solution containing either a photocurable resin or a thermoplastic resin. The method of forming the said hemispherical lens by hardening the said composition solution after apply | coating on a body is mentioned.

  As the inkjet method, a composition solution containing either the photo-curable resin or the thermoplastic resin is applied by an inkjet method, and then the hemispherical lens is formed by curing the composition solution. A method is mentioned. In the ink jet method, the composition solution dropped by ink jet is cured in a lens shape by surface tension.

  The photocurable resin and the thermoplastic resin used for forming these hemispherical lenses are not particularly limited as long as they are cured by light irradiation or heat application, and are appropriately selected according to the purpose. can do.

  There is no restriction | limiting in particular as said other process, According to the objective, it can select suitably, For example, the process of a well-known process is mentioned as a manufacturing process of an organic electroluminescent apparatus.

Here, an example of the manufacturing method of the organic electroluminescent device of the present invention will be described along the manufacturing process.
First, as shown in FIG. 5A, a buffer layer 2 made of, eg, a silicon oxide film is formed on an insulating substrate 8 (eg, a glass substrate) by, eg, CVD.
Next, as shown in FIG. 5B, a polysilicon film is formed on the buffer layer 2 by, for example, a CVD method. Note that an amorphous silicon film may be formed instead of the polysilicon film, and the amorphous silicon film may be crystallized to form a polysilicon film by a laser annealing method or the like.
Next, the polysilicon film is patterned by photolithography and dry etching to form the channel layer 3.
Next, a gate insulating film 4 (silicon oxide film) is formed on the channel layer 3 by, eg, CVD.
Next, for example, an AlNd film is formed by sputtering, the silicon oxide film and the AlNd film are patterned by photolithography and dry etching, and a gate insulating film 4 and a gate electrode 5 made of a silicon oxide film are formed on the channel layer 3. Form.
Next, as shown in FIG. 5B, using the gate electrode 5 as a mask, phosphorus ions are ion-implanted, for example, by an ion implantation method, and a source region 17 and a drain region 18 are formed in the channel layer 3 on both sides of the gate electrode 5, respectively.
Next, an interlayer insulating film 12 (silicon nitride film) is formed on the insulating substrate 1 on which the thin film transistor shown in FIG.
Next, contact holes 19 and 20 reaching the source region and the drain region are formed on the interlayer insulating film 12 by photolithography and dry etching, respectively.
Next, as shown in FIG. 5D, for example, Al / Ti / Al is formed on the interlayer insulating film 12 in which the contact holes are formed by, for example, sputtering.
Next, patterning is performed by photolithography and dry etching to form a source electrode 21 and a drain electrode 22 made of Ti / Al / Ti.
Next, a photosensitive resin is applied thereon by, for example, spin coating to form a photosensitive resin layer 23. After exposing the photosensitive resin layer 23 using a predetermined mask, the exposed photosensitive resin layer 23 is developed using a predetermined developer, and an opening exposing a region on the source electrode 21 of the interlayer insulating film 12 The contact hole is made of a photosensitive resin.
Next, the lower electrode 24 (Al) is formed by sputtering, for example.
Next, the ITO film is patterned into a predetermined shape by photolithography and etching.
Then, as shown in FIG. 5E, an organic layer 25 covering the lower electrode 24 exposed at the bottom of the pixel opening is deposited using a deposition mask to form a film. For example, in order from the lower electrode side 24, a 2-TNATA (4,4 ′, 4 ″ -tris (2-naphthylphenylamino) triphenylamine) film as a hole injection layer and an α-NPD (N , N′-dinaphthylphenylamino) pyrene) film and Alq3 (8-quinolinol aluminum complex) as a light emitting layer are laminated to form the organic EL layer 25. Thereafter, the upper electrode 26 covering the organic EL layer is formed. The upper electrode 26 is formed by forming, for example, a 25 nm-thick Ag film through a mask opened in a predetermined shape by, for example, a vacuum deposition method or a sputtering method. A SiON film having a thickness of 2 μm is formed as a sealing film by CVD.
Next, after film formation, as shown in FIG. 5F, a lens 28 is formed by, for example, an imprint method. Examples of the resin include an acrylic resin.

  The organic electroluminescent device of the present invention includes, for example, a computer, an on-vehicle display, an outdoor display, a household device, a commercial device, a household appliance, a traffic display, a clock display, a calendar display, a luminescent It can be suitably used in various fields including screens and audio equipment.

  Examples of the present invention will be described below, but the present invention is not limited to these examples.

Example 1
<Production of organic electroluminescent device>
On the TFT (Thin Film Transistor), organic electroluminescence elements corresponding to the red (R) subpixel, the green (G) subpixel, and the blue (B) subpixel shown in FIG. 6 are formed as follows. did.

  First, on the reflective electrode (aluminum) of the TFT, as a hole injection layer, 2-TNATA (4,4 ′, 4 ″ -tris (2-naphthylphenylamino) triphenylamine) and F4-TCNQ (tetra Fluorotetracyanoquinodimethane) was co-evaporated at a mass ratio of 99: 1 (2-TNATA: F4-TCNQ) to form a 40 nm thick hole injection layer.

  On the hole injection layer, α-NPD (N, N′-dinaphthyl-N, N′-diphenyl- [1,1′-biphenyl] -4,4′-diamine) was deposited to a thickness of 10 nm. Next, 3,6-bis (carbazol-1-yl) -1-phenylcarbazole was deposited to a thickness of 3 nm to form a hole transport layer having a total thickness of 13 nm.

  A light emitting layer was formed on the hole injection layer. The light emitting layer is formed for each organic electroluminescent device corresponding to the red (R) sub-pixel, the green (G) sub-pixel, and the blue (B) sub-pixel as follows. And a blue light emitting layer were formed.

[Red light emitting layer]
BAlq (bis- (2-methyl-8-quinolinolate) -4- (phenylphenolate) aluminum) and compound R were co-evaporated with 95: 5 (BAlq: compound R) to obtain a thickness of 30 nm and a maximum of one side. A red light emitting layer having a length of 200 μm was formed.

[Green light emitting layer]
mCP (1,3-bis (carbazol-9-yl) benzene) and Ir (ppy ₃ ) (tris (2-phenylpyridineiridium) were co-evaporated at 85:15 (mass ratio) to obtain a thickness of 25 nm. Four green light emitting layers having a maximum length of 100 μm on one side were formed.

[Blue light emitting layer]
mCP and Compound B were co-evaporated at a mass ratio of 85:15 (mCP: Compound B) to form a blue light emitting layer having a thickness of 35 nm and a maximum length of 200 μm on one side.

  BAlq was vapor-deposited to a thickness of 39 nm on each light emitting layer. Next, BCP (2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline) was deposited to a thickness of 1 nm to form an electron transport layer having a total thickness of 40 nm.

  LiF was deposited on the electron transport layer to form an electron injection layer having a thickness of 1 nm.

  Aluminum (Al) was deposited on the electron injection layer to a thickness of 1.5 nm. Subsequently, Ag was vapor-deposited to a thickness of 20 nm to form a transflective electrode having a total thickness of 21.5 nm.

  Next, on the light emitting layer of each organic electroluminescence device corresponding to the red (R) subpixel, the four green (G) subpixels, and the blue (B) subpixels thus formed with the transflective electrodes, A sealing layer having a thickness of 3 μm was formed by vapor-depositing SiON to form an organic electroluminescent portion shown in FIG.

-Fabrication of hemispherical lens-
As shown in FIG. 6, a hemispherical lens having a diameter of 600 μm on the red (R) subpixel, a hemispherical lens having a diameter of 300 μm on each of the four green (G) subpixels, and a diameter of 600 μm on the blue (B) subpixel. The hemispherical lens was formed by the imprint method.
In the imprint method, a photocurable resin composition solution (PAK-02, manufactured by Toyo Gosei Co., Ltd.) was dropped onto a glass mold having a concave portion corresponding to the shape and arrangement of the lens, and applied by spin coating. Then, a 100 μm thick PEN resin sheet (Q65FA, manufactured by Teijin DuPont Co., Ltd.) was placed on the flat coated surface, and UV irradiation (1,000 mJ / cm ² ) was performed from the PET resin sheet side. Then, the composition solution of the photocurable resin was cured, and the glass mold was peeled from this state to produce a hemispherical lens.
Thus, the organic electroluminescent device of Example 1 shown in FIG. 6 was produced.

(Example 2)
In Example 1, an organic electroluminescent device of Example 2 shown in FIG. 10 was produced in the same manner as Example 1 except that the following points were changed.

[Green light emitting layer]
mCP (1,3-bis (carbazol-9-yl) benzene) and Ir (ppy ₃ ) (tris (2-phenylpyridineiridium) were co-evaporated at 85:15 (mass ratio) to obtain a thickness. Nine green light emitting layers having a maximum length of 67 μm at 25 nm and one side were formed.

<Preparation of hemispherical lens>
As shown in FIG. 10, a hemispherical lens having a diameter of 600 μm on the red (R) subpixel, a hemispherical lens having a diameter of 200 μm on each of the nine green (G) subpixels, and a diameter of 600 μm on the blue (B) subpixel. The hemispherical lens was formed by the imprint method.

(Example 3)
In Example 1, an organic electroluminescent device of Example 3 shown in FIG. 14 was produced in the same manner as Example 1 except that the following points were changed.

[Green light emitting layer]
mCP (1,3-bis (carbazol-9-yl) benzene) and Ir (ppy ₃ ) (tris (2-phenylpyridineiridium) were co-evaporated at 85:15 (mass ratio) to obtain a thickness. Twenty-five green light emitting layers having a maximum length of 40 μm on one side and 25 nm were formed.

<Preparation of hemispherical lens>
As shown in FIG. 14, a hemispherical lens having a diameter of 600 μm on the red (R) subpixel, a hemispherical lens having a diameter of 120 μm on each of the 25 green (G) subpixels, and a diameter of 600 μm on the blue (B) subpixel. The hemispherical lens was formed by the imprint method.

(Comparative Example 1)
In Example 1, the organic electroluminescent device of Comparative Example 1 shown in FIGS. 1 and 2 was produced in the same manner as Example 1 except that the following points were changed.

[Green light emitting layer]
mCP (1,3-bis (carbazol-9-yl) benzene) and Ir (ppy ₃ ) (tris (2-phenylpyridineiridium) were co-evaporated at 85:15 (mass ratio) to obtain a thickness. A green light-emitting layer having a maximum length of 200 μm on one side of 25 nm was formed.

<Preparation of hemispherical lens>
As shown in FIGS. 1 and 2, a hemispherical lens having a diameter of 600 μm on the red (R) subpixel, a hemispherical lens having a diameter of 600 μm on the green (G) subpixel, and a diameter of 600 μm on the blue (B) subpixel. The hemispherical lens was formed by the imprint method.

(Comparative Example 2)
In Comparative Example 1, an organic electroluminescent device of Comparative Example 2 shown in FIGS. 18 and 19 was produced in the same manner as Comparative Example 1 except that no hemispherical lens was disposed on the green (G) pixel.

  Next, with respect to Examples 1 to 3 and Comparative Examples 1 and 2, viewing angle characteristics, front luminance, and light extraction efficiency were measured as follows. The results are shown in Table 1.

<Viewing angle characteristics and front luminance evaluation method>
For the front luminance, a luminance meter (CS-2000 manufactured by Konica Minolta Co., Ltd.) was used, and each sample of Examples 1 to 3 and Comparative Examples 1 to 2 was emitted for each of the red subpixel, the green subpixel, and the blue subpixel. In this state, the measurement location of the sample and luminance meter was aligned with the rotation axis, and measurement was performed.
The front luminance was measured so that the light emitting surface and the luminance meter were vertical.
The viewing angle was measured by rotating the sample every 5 ° from that state, and the viewing angle characteristic was the angle at which light entered the lens outside the sub-pixel.

<Light extraction efficiency>
The light extraction efficiency was evaluated using an integrating sphere for each of the red subpixel, the green subpixel, and the blue subpixel, and was evaluated based on the external quantum efficiency (%) when a current of 20 μA was applied. The larger this value, the higher the light extraction efficiency.

  The organic electroluminescence display device of the present invention includes, for example, a computer, an on-vehicle display, an outdoor display, a household device, a commercial device, a home appliance, a traffic display, a clock display, a calendar display, a luminescence. It can be suitably used in various fields including cent screens, audio equipment and the like.

DESCRIPTION OF SYMBOLS 2 Hemispherical lens 11 Glass substrate 12 Anode 13 Hole injection layer 14 Hole transport layer 15 Light emitting layer 16 Electron transport layer 17 Electron injection layer 18 Cathode 19 Barrier layer 30 Hemispherical lens 101, 201 Organic electroluminescent element (organic electroluminescent part)

Claims (7)

An organic electroluminescent device having at least an organic electroluminescent part including at least a light emitting layer and a hemispherical lens for controlling an optical path of light emitted from the light emitting layer,
The organic electroluminescence device includes a plurality of pixels including a red subpixel, a green subpixel, and a blue subpixel, a plurality of organic electroluminescence units corresponding to the subpixels of the pixel, and the organic electroluminescence unit A plurality of hemispherical lenses disposed on each light emitting layer,
An organic electroluminescent device, wherein a diameter of one hemispherical lens among the plurality of hemispherical lenses is different from a diameter of another hemispherical lens adjacent to the one hemispherical lens.   The diameter of one hemispherical lens is larger than the diameter of another hemispherical lens adjacent to the one hemispherical lens, and the other hemispherical lens is a lens assembly composed of a plurality of hemispherical lenses. 2. The organic electroluminescent device according to 1.   The organic electroluminescent device according to claim 2, wherein the lens assembly has 4 to 25 hemispherical lenses. The area of the red subpixel in one pixel of the plurality of pixels and the area of the red subpixel in another pixel adjacent to the one pixel are substantially the same,
The area of the green subpixel in one pixel of the plurality of pixels and the area of the green subpixel in another pixel adjacent to the one pixel are substantially the same,
4. The organic material according to claim 1, wherein an area of a blue subpixel in one pixel of the plurality of pixels and an area of a blue subpixel in another pixel adjacent to the one pixel are substantially the same. Electroluminescent device. The red subpixel in the other pixel is a red subpixel aggregate including a plurality of organic electroluminescence units, and the area of the red subpixel in one pixel and the total area of the red subpixel in the red subpixel aggregate are approximately Are the same,
The green subpixel in the other pixel is a green subpixel aggregate including a plurality of organic electroluminescence units, and the area of the green subpixel in one pixel and the total area of the green subpixel in the green subpixel aggregate are approximately Are the same,
The blue subpixel in the other pixel is a blue subpixel aggregate composed of a plurality of organic electroluminescence units, and the area of the blue subpixel in one pixel and the total area of the blue subpixel in the blue subpixel aggregate are approximately The organic electroluminescent device according to claim 4, which is the same.   6. The organic electroluminescence device according to claim 5, wherein each color sub-pixel assembly has 4 to 25 organic electroluminescence units. The ratio (φ / d) between the diameter φ of one hemispherical lens and the maximum length d of one side of the light emitting layer in one organic electroluminescent portion;
The diameter φ ′ of each hemispherical lens in a lens assembly as another hemispherical lens adjacent to the one hemispherical lens, and a subpixel as another organic electroluminescent part adjacent to the one organic electroluminescent part The ratio (φ ′ / d ′) to the maximum length d ′ of one side of each light emitting layer in the aggregate is expressed by the following formula: 0.9 <(φ / d) / (φ ′ / d ′) <1 The organic electroluminescent device according to any one of claims 5 to 6 satisfying .1.