JP2002237386A - Organic electroluminescent element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a white color emitting organic EL element that has durability and emits light of nearly genuine white color. SOLUTION: The organic compound layer which is provided between a positive electrode and a negative electrode contains a compound that is expressed by the formula (1) and a compound that is expressed by the formula (2). Specifically, the luminous layer in the organic compound layer is doped with the blue color luminous material (pyrene derivative) of the above formula (1) as a host and a chalcone type pigment as expressed by the above formula (2) as an orange-color doping material, and is constructed by a single luminous layer. Or it comprises a blue color luminous layer which contains the compound of the formula (1) and an orange color luminous layer in which the compound of the formula (2) is doped. Provided that, in the formula (1) and (2), R1-R19 is hydrogen atom or a prescribed substitutional group, and Ar is an aromatic group, and n is 2 or 3. The compounds of the formula (1) and (2) are superior in durability, and a Forster energy transfer takes place between the two compounds and when the blue color and orange color emit, a white color emission of nearly genuine white color is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an organic electroluminescent device,
In particular, it relates to a white light emitting element.

[0002]

2. Description of the Related Art Organic electroluminescent devices (hereinafter, referred to as organic EL devices) are advantageous in power saving, and have characteristics that they can emit light with a high viewing angle and high brightness. , As a planar light source.

[0003] In such an organic EL device, realizing white light emission is required to increase the number of colors and full color of the display panel, to use the white light emission itself as display light, and to further improve the backlight of a liquid crystal display or the like. It is very important to meet the needs of

However, no white light-emitting organic material which can be used for an organic EL device and has practical-level characteristics has been developed. For this reason, in the organic EL element, as a method of realizing white light emission, a method of emitting two colors having a complementary color relationship from a plurality or a single light emitting layer, and a method of providing three light emitting layers of red, blue, and green are provided. A method for obtaining white color has been proposed. As one of the former methods, a configuration in which two organic layers emit light has been proposed (Japanese Patent No. 2991450, Japanese Patent Application Laid-Open No. H6-158038, Japanese Patent Application Laid-Open No. H7-65958, etc.). Further, a configuration in which a hole transport layer and a light emitting layer emit light, and a method of doping a blue-green host material with a red doping material to obtain white light emission (Japanese Patent Application Laid-Open No. 9-208946) have been proposed. The latter methods include blue, green,
A method of obtaining white light by laminating red light-emitting layers (Japanese Unexamined Patent Publication No.
-142169) and the like.

[0005] Of the above two methods for obtaining white light emission, the former (using two complementary colors) is considered to be capable of easily obtaining white light with high efficiency with a small number of layers. The light having a complementary color relationship is, for example, blue and yellow to orange, or blue-green and red. To obtain white, first, a material that emits these colors is required.

[0006] As the blue material, an arylarylene-based or diferanthracene-based material is known as a material having high efficiency and excellent durability. Also, Japanese Patent Application Laid-Open No. 6-2199
No. 73 and JP-A-10-88122 disclose a blue light-emitting material of a pyrene derivative.

As an orange-yellow light emitting material having a complementary color relationship with blue, rubrene is known as a carrier trap type material, and has an excellent effect of extending the life of the device.
As another material, a DCM dye of a laser dye (Japanese Patent Application Laid-Open No. 10-308281) is known.

[0008]

However, in order to obtain pure white light, even if the above complementary color relationship is used,
It is necessary to use a light emitting material having high color purity. However, for the currently proposed luminescent materials, when selecting a material by focusing on the high color purity of the luminescent color, for example, between a blue luminescent material and an orange luminescent material, one of the materials has poor durability, There is a problem that an element having a long life cannot be obtained.

In order to emit white light by using the complementary color, if the two colors are obtained by separate light-emitting layers, the number of steps for manufacturing the light-emitting layers increases accordingly, and the steps for manufacturing the organic EL element become complicated. become. Further, doping the hole transport layer with a light emitting material without using a plurality of light emitting layers is disclosed in, for example, JP-A-6-158038 and JP-A-7-65958. However, the hole transporting materials having a trifalamine skeleton disclosed therein are materials having a small polarity, and thus the main peak of light emission of the doping material is often shifted to a shorter wavelength side. For this reason, there was a problem that it was not possible to obtain orange light emission and to obtain pure white light emission even when light was emitted simultaneously with blue light.

According to the disclosure of Japanese Patent Application Laid-Open No. 9-202946, the light-emitting layer is a single layer, and white light emission is obtained by doping a blue-green host material with a red doping material. In pure white CIE coordinates (0.3
3,0.33). Further, the heat resistance of the red doping material is not sufficient, and the device life is still insufficient.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to realize an organic EL device which is excellent in durability and can obtain white light emission as close to pure white as possible.

[0012]

To achieve the above object, an organic EL device according to the present invention comprises a compound represented by the following chemical formula (1) and a compound represented by the following chemical formula (2) between electrodes. When

Embedded image

Embedded image And an organic compound layer containing: In the formulas (1) and (2), R1 to R19 are a hydrogen atom or a predetermined substituent, Ar is an aromatic group, and n is 2 or 3.

Since the organic EL element is a current injection type element, when driven at a constant current, a material which is weak in repetition of oxidation / reduction or a material which is weakest thermally is deteriorated first, and the entire element is deteriorated. Leads to. The blue material of the present invention represented by the chemical formula (1) and the orange material represented by the chemical formula (2) are:
All are material stability (electrochemical and thermal stability)
Excellent. Therefore, by manufacturing an organic EL device using both of them, the stability of the entire device can be improved.

Further, the chromaticity of blue alone due to the compound represented by the above formula (1) is (0.151, 0.2
30), the chromaticity of the orange color alone resulting from the compound represented by the chemical formula (2) is (0.524, 0.453). Therefore, when these two chromaticities are connected by a straight line, they pass near (0.33, 0.33) which is pure white, and pure white is obtained by adjusting the intensities of blue and orange.

Another feature of the present invention is that in the above-mentioned organic EL device, the compound represented by the chemical formula (2) is included as a doping material in the light emitting material containing the compound represented by the chemical formula (1). That is.

Each of the above two derivatives is a host material,
When used as a doping material, the energy transfer from the host to the doping material is a Forster type energy transfer. Therefore, if the emission wavelength of the host is different from the absorption wavelength of the doping material, or if the absorbance of the doping material is weak, the energy transfer from the host to the doping material is not complete. It is possible to obtain luminescence.

Since the emission wavelength of the derivative represented by the chemical formula (1) is based on the bound pyrene, 440 n
m to 480 nm. Since the center wavelength of absorption of the orange material (orange doping material), which is a derivative represented by the chemical formula (2), is 490 nm to 520 nm, a white light-emitting organic EL element close to pure white can be realized.

Another feature of the present invention is that, in the above-mentioned organic EL device, the first organic EL device containing the compound represented by the chemical formula (1)
A light emitting layer and a second light emitting layer containing a compound represented by the chemical formula (2).

Since the emission wavelength of the derivative represented by the chemical formula (1) is based on the bound pyrene, 440 n
m to 480 nm. The center wavelength of light emission of the orange material (orange doping material) which is a derivative represented by the chemical formula (2) is 560 nm to 600 nm. Therefore, not only the single light emitting layer structure as described above but also obtaining two colors of light from the two light emitting layers, respectively, can realize a white light emitting organic EL element having excellent durability and almost pure white. it can.

In the present invention, in any one of the above-mentioned organic EL devices, the compound represented by the chemical formula (1) is represented by the following chemical formula (3)

Embedded image The compound represented by the chemical formula (2) is represented by the following chemical formulas (4), (5), (6) and (7)

Embedded image The compound represented by any one of the above is applicable.

[0021]

Embodiments of the present invention (hereinafter referred to as embodiments) will be described below with reference to the drawings.

FIG. 1 shows an example of a cross-sectional configuration of an organic EL device which emits white light according to an embodiment of the present invention. In FIG. 1, an anode 12 using ITO (Indium Tin Oxide) or the like as a transparent electrode is placed on a transparent substrate 10 such as glass.
Is formed thereon, and an organic compound layer 200 having at least a light emitting layer in a multilayer structure is formed thereon.
The cathode 14 is formed on the metal layer 00 using, for example, LiF and Al as metal materials.

In the organic EL device according to the present embodiment, the organic compound layer 200 includes at least the hole transport layer 22, the white light emitting layer 24 composed of a single layer, and the electron transport layer 26, which are composed of the anode 12 and the cathode 14. And a multilayer structure laminated in this order.

The white light emitting layer 24 has the general formula (1)

Embedded image A blue light-emitting material composed of a pyrene derivative represented by In the formula (1), R1 to R9
Is a hydrogen atom or a desired substituent, Ar is an aromatic group, n is 2
Or 3, 440 nm to 480 nm based on pyrene
Emits a wavelength of As an example, the following chemical formula (3)

Embedded image Can be adopted.

The white light-emitting layer 24 further has the general formula (2)

Embedded image And an orange light emitting material complementary to the blue color is doped as a guest material. This compound is a chalcone type compound (dye), and in the formula (2), R
10 to R19 are a hydrogen atom or a desired substituent, and the central wavelength of absorption of this material is 490 nm to 520 nm. As an example, the following chemical formulas (4), (5), and (6)
And (7)

Embedded image Can be employed.

In this embodiment, the energy transfer between the guest material of the above formula (1) and the doping material of the above formula (2) contained in the light emitting layer 24 is of the Forster type. Since the emission wavelength of the host material is different from the absorption wavelength of the guest material, and the rest height of the guest material is weak, the energy transfer from the host to the guest does not completely occur. As a result, light emission of both the host and guest is obtained, and white light emission is obtained.

The chromaticity of blue alone due to the pyrene derivative compound of the above formula (1) is (0.151, 0.23
0), and the chromaticity of the orange color alone resulting from the chalcone type compound represented by the chemical formula (2) is (0.524, 0.45
3). Therefore, if these two chromaticities are connected by a straight line, they pass near (0.33, 0.33) which is pure white. Therefore, the chromaticity coordinates of the emission color (synthetic color) can be changed by adjusting the emission intensity of blue and orange, for example, the doping amount of the doping material, and pure white can be obtained by setting appropriate conditions. it can.

In the present embodiment, the materials used for the hole transport layer 22 and the electron transport layer 26 are not particularly limited. For example, for the hole transport layer 22, triphenylamine tetramer (TPTE) can be used, and for the electron transport layer 26, a quinolinol aluminum complex (Alq3) can be used. Of course, other hole transporting compounds and other electron transporting compounds can be employed. Further, as shown in FIG. 1, a hole injection layer 20 may be provided between the anode 12 and the hole transport layer 22. In this case, as a material of the hole injection layer, for example, CuP
c (copper phthalocyanine), starburst amine, vanadium oxide and the like can be employed.

As described above, for example, L
A laminated electrode of iF and Al can be used, but the material is not limited to these. An organic layer doped with another alkali fluoride, alkali oxide or metal may be provided with an electron between the metal cathode and the electron transport layer. It may be provided as an injection layer.

With the above configuration, in the organic EL device of the present embodiment, holes are injected from the anode 12 into the light emitting layer 24 via the hole injection layer 20 and the hole transport layer 22. Electrons are injected from the cathode 14 through the electron transport layer 28, and both the blue light emitting material (host) and the orange light emitting material (guest) complementary to the blue light emitting material emit light, and pure white light is emitted.

Next, in the above description, a single white light emitting layer in which a blue material is doped with an orange material is shown as the light emitting layer. However, as shown in FIG. 2, a laminated white light-emitting layer provided with a blue light-emitting layer made of a blue material represented by the above formula (1) and an orange light-emitting layer made of an orange material represented by the formula (2), respectively. It may be a light emitting layer. Even with such a laminated structure, a white light-emitting element having excellent characteristics can be obtained. The orange light-emitting layer can be obtained by, for example, using Alq3 as a host material, a chalcone-type dye represented by the formula (2) as a doping material, and doping a desired amount of the chalcone-type dye into the host material. The light-emitting layer having such a two-layer structure increases the number of manufacturing steps as compared with an organic EL element having a single-layer white light-emitting layer 24, but realizes pure white as a light-emitting color similarly to the case of a single layer. In addition, since both the blue and orange light-emitting layers have high durability, they can contribute to prolonging the life of the element.

[0032]

Example 1 White Organic EL Device in which Blue Emitting Layer is Doped with an Orange Doping Material Next, a blue light emitting device according to Example 1 will be described. The device configuration is the same as that of FIG. 1 described above. In the single white light emitting layer 24, a pyrene derivative is used as a blue host material, and a chalcone dye is used as an orange doping material.

(Preparation of Device of Example 1) A glass substrate 10 on which a transparent electrode 12 of ITO was formed in advance was washed with an organic alkali cleaning agent Semico Clean 56 (Furuuchi Chemical), pure water,
After ultrasonic cleaning in the order of acetone and ethanol, UV ozone treatment was performed to remove organic contaminants on the ITO surface, and the substrate was quickly set in a vapor deposition apparatus. In the pretreatment chamber, plasma treatment was performed with a mixed gas of argon and oxygen,
The ITO substrate was cleaned.

Next, after mounting a mask for an organic film in a vacuum, the organic compound layer 200 was continuously formed by heating the carbon crucible. First, the following chemical formula (8)

Embedded image The hole injection layer 20 was formed by laminating 10 nm of CuPc shown in FIG. Then, the following chemical formula (9)

Embedded image The TPTE shown in FIG.
Was formed.

Next, a pyrene derivative (compound 1-1) represented by the above chemical formula (3) was used as a host material, and a chalcone dye (compound 2-3) represented by the above chemical formula (5) was added to the host. 0.5% and the white light-emitting layer 24 is 40 n
m.

Subsequently, the following chemical formula (10)

Embedded image The quinolinol aluminum complex (Alq3) represented by the following formula was laminated as the electron transport layer 26 to a thickness of 20 nm. The film formation rate of each layer of the organic compound layer 200 was set at 2 to 6 nm / min.

Further, the mask was changed to a cathode electrode in a vacuum, and LiF was removed from the W filament by 3 nm / min.
Was deposited from a PBN crucible at a deposition rate of 10 nm / min to form a film of 0.5 nm and 160 nm, respectively, to form a cathode 14.

Each of the above layers of the device has a degree of vacuum of 8 × 1.
The film was formed under the condition of 0 ⁻⁷ Torr (1 Torr ≒ 133 Pa) or less. Next, the element obtained by forming up to the cathode as described above was subjected to a sealing treatment using an ultraviolet curing resin in dry nitrogen having a dew point of 60 ° C. or less.

(Comparative Example 1) For comparison with Example 1, as Comparative Example 1 (a), a blue light-emitting layer using a pyrene derivative represented by the above chemical formula (3) was used. (11)

Embedded image And the same elements as in Example 1 were manufactured for other elements.

As Comparative Example 1 (b), a stacked device having two light emitting layers was manufactured. Specifically, Comparative Example 1
The device according to (b) is composed of an anode: ITO / hole injection layer: Cu
Pc (10 nm) / hole transport layer: TPTE (50 nm)
/ Blue light emitting layer: Compound 1-1 (20 nm) / Orange light emitting layer: Compound 1-1 (20n) doped with 1.5% of DCM
m) / electron transport layer: Alq3 (20 nm) / cathode: Li
F and Al are sequentially laminated.

(Characteristic Evaluation 1) The emission spectrum, the relationship between the injection current density and the emission luminance, and the relationship between the applied voltage and the emission luminance were measured for the organic EL device manufactured by the above method, and the emission efficiency was calculated. Also, the initial luminance is 2400 cd /
A current was injected so as to be m ^2, and the drive voltage dependence of luminance was also measured. 3 to 5 show emission spectra, Table 1 shows initial characteristics, and FIG. 6 shows operating life.

In the device of Example 1, the emission spectrum is divided into two peaks as shown in FIG.
A spectrum having main peaks at m and 575 nm was obtained. At this time, the chromaticity coordinates are (0.34, 0.40), and almost pure white light emission is obtained.

Table 1 below

[Table 1] As shown in the figure, in the device of Example 1, the current efficiency was 7 cd.
/ A, and has sufficient efficiency. On the other hand, Comparative Example 1 using DCM as a doping material
In (a), there is almost no blue light-emitting component, and 580 nm
And emits yellow light having a main peak, and has a chromaticity of (0.51,
0.47). That is, a white light emitting device could not be obtained with the device configuration of Comparative Example 1 (a).

Referring to the change in the emission spectrum before and after driving the element, as shown in FIG. 4, in Example 1, although the orange component slightly decreased, the white component remained within the allowable range of white even after continuous driving. Fits. On the other hand, in the device of Comparative Example 1 (b) in which the light emitting layer has a two-layer structure so that the initial light emission color becomes white, the orange component becomes extremely weak when driven as shown in FIG. The blue component became relatively strong, and the light emission color of the element changed to light blue. Therefore, Comparative Example 1 (b) in which the initial characteristics are white
It can be seen that even with the element of the above, the color tone changes greatly with time, making it difficult to use as a display panel.

Further, the half life of the luminance is calculated as the initial luminance of 240.
As a result of measurement at 0 cd / m ^2, as shown in FIG. 6, in Example 1, the result was twice or more as large as that of Comparative Example 1 (b).
It was confirmed that the device of Example 1 had a long life.

(Effect) As described above, the center wavelength of light emission of the derivative represented by the chemical formula (1) is 440 to 480 nm because it is based on the bound pyrene. The center wavelength of absorption of the orange doping material using the derivative dye represented by the chemical formula (2) is 490 to 520 nm. For this dye, the energy transfer from the host to the doping is considered to be a Forester-type energy transfer. In the device according to the present invention, as can be seen from FIG.
There is a difference between the emission wavelength of the host and the absorption wavelength of the doping, and the absorbance of the orange doping material is small. Therefore, energy transfer from the host to doping does not completely occur, and both blue and orange light are emitted, whereby white light emission can be obtained. In contrast, when DCM is used as a doping material as in Comparative Example 1 (a), DCM has an absorption wavelength of 4 nm.
Although the wavelength is 90 nm, which is slightly longer than the emission wavelength of the blue host, the energy is easily transferred due to the large absorbance, and the yellowish orange characteristic of DCM is obtained as is clear from FIG.

Further, the electrochemical and thermal stability of the materials represented by the chemical formulas (1) and (2) are the same as those of the conventional organic EL.
Since they are superior to materials, the operating life of devices using these materials has been extended.

<Example 2: Blue light-emitting layer and orange light-emitting layer 2
Organic EL Device Having Layer Structure> (Preparation of Device of Example 2) As Example 2, a white light-emitting device provided with two light-emitting layers was prepared. The configuration is the same as FIG. As a substrate, a glass substrate with ITO that had been cleaned in the same manner as in Example 1 was used. After mounting a mask for an organic film in a vacuum, heating the carbon crucible to form a 60 nm thick hole transport layer (TPTE) and a 10 nm thick blue light emitting layer (pyrene derivative represented by chemical formula (3)) as an organic compound layer.
An orange light-emitting layer (Alq3 doped with 1.5% by volume of a chalcone dye represented by the chemical formula (7) by volume) was deposited to a thickness of 20 nm, and an electron transport layer (non-doped Alq3) was deposited to a thickness of 30 nm. Next, the mask was changed to a cathode electrode in a vacuum, and the LiF electron-injecting layer was 0.5 nm at 3 nm / min.
160 nm from N crucible at a deposition rate of 10 nm / min
Formed. The conditions for forming each layer of the device were as follows: vacuum degree 8 ×
The test was performed at 10-7 Torr or less. After forming each layer,
The metal can was sealed in nitrogen in the same manner as in Example 1.

Comparative Example 2 As Comparative Example 2, the following chemical formula (12) was used instead of the pyrene derivative represented by the chemical formula (3) used as the material for the blue light emitting layer in Example 2.

Embedded image Distyrylarylene blue material (DPVB)
An element using i) was produced. In the device according to Comparative Example 2, since the blue light emission luminance was low, DPVBi was set to 20 nm as the blue light emitting layer, which was thicker than the corresponding layer of Example 2, and the orange light emitting layer was formed by the chalcone represented by chemical formula (7). 1 layer of Alq3 doped with 1.5%
The configuration was set to 0 nm. For other layers, see Example 2.
Is the same as

(Evaluation of Characteristics 2) The emission spectrum, initial characteristics and half-life of the device were measured in the same manner as in Example 1 for the organic EL device manufactured by the above method. FIG. 7 shows the EL spectrum and FIG. 8 shows the operating life. Table 2 below shows the emission luminance and chromaticity coordinates.

[Table 2] Shown in

As shown in the spectrum diagram of FIG. 7, the device of Example 2 has EL peak wavelengths of 470 and 575 n.
m white device. Further, the device of Comparative Example 2 also had peak wavelengths of 470 and 575 nm and emitted light similar to that of Example 2, and both devices emitted white light by adjusting the thickness and doping amount of the light emitting layer. I have. However, there is a large difference in light emission luminance. That is, in Comparative Example 2, Table 2
As shown in (2), the current efficiency is only 4.2 cd / A, but in Example 2, the efficiency is as high as 6.0 cd / A.

As for the half life of the luminance when the initial luminance is 2400 cd / m ² , as shown in FIG. 8, Comparative Example 2 is 3 hours, whereas Example 2 is Extends over 30 hours. Example 2 and Comparative Example 2
In the case of the device of (1), since the durability of Alq3 doped with an orange dye is excellent, the blue light-emitting layer is deteriorated first and governs the life of the entire device. In the device of Example 2, since a blue light-emitting material having a pyrene skeleton excellent in durability is used, a long life can be achieved.

(Effect) In order to obtain white light emission, if the chromaticities of the respective emission spectra are connected as described above, it is necessary to pass through the chromaticity of white (0.33, 0.33). In order to obtain white light, it is necessary to take a certain luminous intensity. However, in Example 2, since the luminous intensity of either blue or orange luminescence is high, other luminous It was not necessary to adjust (weakened) the intensity, and high-efficiency white light emission was realized.

With respect to the life of the device, when a conventional blue material is used as shown in Comparative Example 2, the deterioration of the blue light-emitting layer limits the life of the device, but the durability is excellent as in Example 2. By using a blue material, the half-life during continuous driving is significantly increased. Furthermore, since blue light emission is reduced by a gradual decrease in luminance as much as deterioration of orange light emission, there is an advantage that chromaticity of white hardly changes with driving time.

[0055]

As described above, in the present invention, the blue light-emitting material represented by the chemical formula (1) and the orange light-emitting material represented by the chemical formula (2) are used for the material of the organic compound layer, particularly, the light-emitting layer. . Any of these compounds is a highly efficient and long-lived light-emitting material. By using these compounds, a highly efficient and long-lived white light-emitting organic EL device can be realized.

In the present invention, by adopting the blue material and the orange material, (0.3)
3, 0.33) can be obtained.
As the light emitting layer, an element having excellent characteristics can be formed by either a single light emitting layer structure in which a blue material is doped with an orange material or a laminated structure in which a blue material and an orange material are each independently formed. In addition, the former single light emitting layer structure can further simplify the element manufacturing process.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a white organic EL device according to an embodiment and Example 1 of the present invention.

FIG. 2 is a diagram showing a schematic configuration of a white organic EL device according to an embodiment and Example 2 of the present invention.

FIG. 3 is a diagram showing emission spectra of the organic EL devices according to Example 1 of the present invention and Comparative Example 1 (a).

FIG. 4 is a diagram showing the initial characteristics of the organic EL element according to Example 1 and changes in the emission spectrum after continuous driving.

FIG. 5 is a diagram showing initial characteristics of an organic EL element according to Comparative Example 1 (b) and a change in an emission spectrum after continuous driving.

FIG. 6 is an organic EL according to Example 1 and Comparative Example 1 (b).
FIG. 3 is a diagram showing a change over time in light emission luminance of the element.

FIG. 7 is a diagram showing emission spectra of the organic EL devices of Example 2 and Comparative Example 2.

FIG. 8 is a diagram showing a change over time in light emission luminance of the organic EL elements according to Example 2 and Comparative Example 2.

[Explanation of symbols]

Reference Signs List 10 substrate, 12 anode, 14 cathode, 20 hole injection layer, 22 hole transport layer, 24 white light emitting layer, 26 electron transport layer.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Atsushi Miura 41-Cho, Yokomichi, Nagakute-cho, Aichi-gun, Aichi Prefecture Inside Toyota Central Research Laboratory Co., Ltd. No. 41, Yokomichi, Toyota Central Research Laboratory Co., Ltd. (72) Inventor Takeshi Owaki Takeshi Ochi, Nagakute-cho, Aichi-gun, Aichi Prefecture, Japan No. 41, Toyota Central Research Laboratory Co., Ltd. (72) Inventor Yasunori Taga Aichi Prefecture 41, No. 41, Yokomichi, Nagakute-cho, Nagakute-cho, Aichi-gun F-term in Toyota Central R & D Laboratories, Inc. (reference) 3K007 AB02 AB03 AB04 AB11 AB18 BB01 BB04 CA01 CB01 DA01 DB03 EB00

Claims (4)

[Claims] A compound represented by the following chemical formula (1) and a compound represented by a chemical formula (2) are provided between electrodes. Embedded image (However, in the above formulas (1) and (2), R1 to R
19 is an organic electroluminescent element having an organic compound layer containing a hydrogen atom or a predetermined substituent, Ar being an aromatic group, and n being 2 or 3). 2. The organic electroluminescent device according to claim 1, wherein the compound represented by the chemical formula (2) is included as a doping material in the light emitting material containing the compound represented by the chemical formula (1). An organic electroluminescent device, comprising: 3. The organic electroluminescent device according to claim 1, wherein a first light emitting layer containing the compound represented by the chemical formula (1) and a second light emission containing the compound represented by the chemical formula (2). And an organic electroluminescent device comprising: 4. The organic electroluminescent device according to claim 1, wherein the compound represented by the chemical formula (1) is represented by the following chemical formula (3). The compound represented by the chemical formula (2) is represented by the following chemical formulas (4), (5), (6) and (7). An organic electroluminescent device represented by any one of the above.