JPH1025473A - Electroluminescent element and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an electroluminescent element which comprises a first transparent electrode, an org. layer, and a second electrode laminated on a transparent substrate, is excellent in heat resistance and durability, and can form, by vapor deposition, a high-purity hole transport layer by incorporating a specific polymer into the org. layer. SOLUTION: This element is produced by by successively laminating the first transparent electrode (e.g. an ITO electrode), an org. layer mainly comprising an org. compd. which emits light under a voltage applied, and the second electrode (e.g. an Mg metal electrode) on a transparent substrate (e.g. a glass substrate). The org. layer contains a polymer (e.g. one represented by the formula) which pref. has a degree of polymn. of 3-7 and has, as the base units, units derived from a hole transport molecule having arom. rings (e.g. triphenylamine). The arom. rings of a base unit have been bonded to those of the other base units directly or through unsatd. side chains.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electroluminescent device having an organic layer and a method for manufacturing the same. Since the electroluminescent element is a planar light emitting body capable of electrically emitting light, it can be used as a display device such as a front display of an automobile or a backlight of a liquid crystal display.

[0002]

2. Description of the Related Art An electroluminescent device has a pair of electrodes attached to a solid organic compound having strong fluorescence, and emits light by applying a voltage. In general, an electroluminescent element has a structure in which a transparent electrode (ITO), an organic layer as a light emitting layer made of a solid organic compound having strong fluorescence, and a metal (eg, Mg) electrode are sequentially laminated on a transparent glass substrate. have. The principle of light emission of this electroluminescent device is as follows.
When holes are injected from the anode and electrons are injected from the cathode, the injected holes and electrons move through the solid, collide and recombine, and disappear. The energy generated by the recombination is used to generate the excited state of the light-emitting molecule and emits fluorescence.

[0003] Such an electroluminescent device has no limitation on the viewing angle, can operate at a low voltage and can respond at high speed, and has a higher display performance than other display devices such as a liquid crystal, a plasma display, and an inorganic electroluminescent device. Has excellent characteristics as. However, it has been pointed out that the electroluminescent device in which the light emitting portion is formed of an organic layer has a short life. One of the reasons why the life of the electroluminescent device is short is that there is a problem of deterioration and deterioration due to crystallization of organic substances (hole transporting molecules).
That is, the heat generated by the element at the time of driving causes peeling at the junction interface of the element, deformation of the organic layer, deterioration of the organic substance itself, and thermal deterioration of the organic layer.

The electroluminescent device is a flat luminous body of high display quality, but it is required to overcome the problems of improvement in heat resistance and prolonging the service life in practical use of this device. This is because the electroluminescent device has a problem of deterioration and deterioration due to crystallization of the organic substance (hole transport function molecule) in the device. To solve the problem of crystallization of organic matter,
As a method for improving the heat resistance of the hole transport function molecule itself, a starburst amine molecule (Appl. Phys. Lett., 65
(7), 807 (1994)) and the use of a TPD derivative (tetraphenylbenzidine derivative) as a hole transport function molecule.

[0005] The relationship between the heat resistance and the molecular structure of the hole transporting function molecule is not clear at present. For example, Suzuki is T
Various derivatives having different PD substituents were synthesized, and the relationship between the lifetime and the molecular structure of the device was examined. However, no clear conclusion was obtained (Proceedings of the Japan Society of Applied Physics, p1074, spring 94). Moreover, in the materials used by them, no relationship was found between Tg and device life. In addition, Adachi et al. Synthesized various hole transporting molecules and examined the lifetime of devices using these materials, and reported that there was a correlation between the lifetime of the device and the ionization potential of the molecule ( APPL.PHYS.LETT.,
66 (20) 2679 (1995)). However, no conclusions relating to the molecular structure have been obtained.

[0006] As another method, there is a method of improving heat resistance by polymerizing a hole transport function molecule. In other words, by polymerizing the hole transport function molecule, the molecular motion and the arrangement state of the molecule are regulated, the amorphous state becomes a thermodynamically stable state, and the problem of crystallization seen in small molecules is avoided. can do. Examples of such a polymer-dispersed EL device using polyvinyl carbazole as a matrix (applied physics 61 (10), 1044 (1992)),
Polymers containing triphenylamine or TPD in the side chain (Polymer Transactions 52 (4), 216 (1995)), and those having a hole-transporting molecule introduced into the main chain of polycarbonate (Japanese Unexamined Patent Publication No.
247458) is known.

As another method, attempts have been made to improve the heat resistance by dissolving a hole transport molecule in a heat resistant matrix. Tokito et al. Reported that they succeeded in dispersing and fixing organic molecules in an inorganic substance by a binary simultaneous vapor deposition method and improved heat resistance (Tokitomi et al., Appl. Phys. Lett.,
66 (6) 673 (1995)).

[0008]

In the case of an electroluminescent device using the above polymer material, a hole transporting functional material is prepared by a polymerization method. For this reason, it is difficult to remove impurities such as inorganic salts, solvents, and catalysts used in the polymerization. Even if a small amount of these impurities are mixed into the device, the characteristics of the light emitting device are deteriorated. In addition, in the preparation of a material using a polymerization method, when forming a hole transport function, defects such as a change in chemical structure due to an oxidation reaction of a side chain of a polymer or the like are inevitable. Further, it is impossible to remove a defective portion in the polymer once formed. Furthermore, if a defect in the polymer chain acts as a trap for holes, it leads to a decrease in device characteristics. Further, it is difficult to remove the solvent used during the production of the device from the device.

The method of dissolving the hole transport molecule in the heat resistant matrix can improve the heat resistance of the device.
It is inevitable that the density of the hole transporting molecules decreases due to the presence of the matrix, and that the distance between the hole transporting molecules increases, so that hopping between the hole molecules hardly occurs. For this reason, when the hole transport function of the hole transport layer of the light emitting element is reduced, the device characteristics are reduced as compared with the case where the hole transport function molecule is used alone.

The hole transporting function molecules used in the light emitting element manufactured by the vapor deposition method are easy to purify and contain little impurities, and the hole transporting layer has a high density of hole transporting molecules present in the hole transporting layer. Although there is an advantage that a device with excellent characteristics can be manufactured without lowering the function, there are few guidelines for improving the heat resistance of the material as described in the prior art, and synthesis must be tried by trial and error. ,
It was difficult to increase heat resistance.

The present invention has been made in view of the above circumstances, and has been developed to provide a hole transporting functional material having excellent heat resistance, which can be deposited, to provide an organic electroluminescent device having excellent heat resistance, and a method of manufacturing the same. The goal is to establish

[0012]

Means for Solving the Problems The present inventors systematically synthesized multimers of the compound using a molecule having a hole transporting function such as triphenylamine as a basic unit. As a result, for example, in triphenylamine, it was found that there was a clear correlation between the degree of multimerization and Tg, which is an index of the heat resistance of the compound. That is, each time one triphenylamine unit was added, the Tg of the polymer increased by about 30 ° C. Specifically, as shown in Table 3, the dimer (T
PD), trimer (TPTR), tetramer (TPTE) T
g were 60 ° C, 95 ° C, and 130 ° C, respectively. Therefore, it has been found that as the degree of multiplication of the basic unit increases, a material having better heat resistance can be obtained. Moreover, in the case of the triphenylamine unit, it was found that the hole transport function hardly changed even if the degree of multimerization was increased, and that an excellent hole transport function was obtained. When an electroluminescent element was manufactured using the hole transporting molecule, a light emitting element having high heat resistance and a long life was obtained, and the present invention was completed.

[0013] The electroluminescent device of the present invention comprises:
In an electroluminescent device in which a transparent first electrode, an organic layer mainly containing an organic compound which emits light by application of a voltage, and a second electrode are sequentially laminated, the organic layer has a hole transporting property having an aromatic ring. It is characterized in that a functional molecule is a basic unit, and that the aromatic ring of the basic unit contains a multimer in which a bond is formed directly or via an unsaturated side chain.

Preferably, the basic unit is triphenylamine. The phenyl group of the triphenylamine preferably has a substituent bonded thereto. It is preferable that the multimer has a degree of multimerization capable of forming the hole transporting functional layer by a vapor deposition method.

According to the method of manufacturing an electroluminescent device of the present invention, a transparent first electrode, an organic layer mainly composed of an organic compound which emits light by applying a voltage, and a second electrode are sequentially deposited on a transparent substrate by vapor deposition. In the method for manufacturing an electroluminescent device formed by stacking, the formation of the organic layer and the second electrode is performed by maintaining the temperature of the transparent substrate at 80 ° C. or higher and a glass transition temperature or lower of an organic material to be deposited. It is characterized by being formed by vapor deposition.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The electroluminescent device of the present invention comprises a transparent first electrode, a transparent first electrode, an organic layer mainly composed of an organic compound which emits light when a voltage is applied, and a second electrode. Do it. The transparent substrate is not particularly limited, and a glass substrate, a transparent ceramics substrate, a diamond substrate, or the like can be used.

The transparent first electrode is an electrode having high light transmittance and conductivity. For example, a gold deposited film, ITO, or polyaniline can be used as in the conventional case. The organic layer formed of an organic compound that emits light by the application of the voltage is not particularly limited, but is generally formed of an electron transporting functional molecule, a light emitting functional molecule, a hole transporting functional molecule, a matrix, a binder, or an organic material having a combination of these. Dozens to hundreds of layers or layers
m can be obtained as a thin film having a uniform thickness.

The second electrode may be either a transparent electrode or an opaque electrode. Generally, Mg, Ag, Mg-A
g or other metal electrode can be used. The hole transporting functional molecule of the present invention has a hole transporting functional molecule containing a known aromatic ring as a basic unit, and this basic unit forms a bond having a conjugated structure with an aromatic ring to form a multimer. Compound. Examples of the well-known hole transporting functional molecule containing an aromatic ring include hydrazine-type, stilbene-type, triphenylamine-type, and heterocyclic-type compounds.

Above all, it is preferable because a multimer of triphenylamine dimer or more can be easily synthesized, and a high-purity, high-performance hole transport function layer can be formed by vapor deposition. The multimer of triphenylamine desirably has a degree of multiplication of 7 or less to which a vacuum deposition method can be applied. When heat resistance is required, the degree of multiplication is desirably 3 or more.

In the case of a basic unit, for example, triphenylamine, the number of substituents per basic unit is one.
To 15 is possible, but 1 to 3 are particularly desirable.
The basic unit of the hole transporting functional molecule is a multimer formed by bonding aromatic rings directly or via a conjugate bond. As the conjugate bond, for example, -CH = C
H-, -C≡C-, -N = N-, -C = N-, -C
(R) = C (R ′)-(R and R ′ are alkyl or aryl groups) and aromatic compounds (for example, phenyl group, biphenyl group, triphenyl group, naphthyl group, anthranyl group, phenanthryl group, etc.). Can be

Further, a compound in which a substituent is introduced into an aromatic ring using a multimer as a basic skeleton may be used. Examples of such a substituent include an alkyl group, an allyl group, an aryl group, an amino group, an alkoxyl group, and an allyloxy group. Groups, thioalkyl groups, thioallyl groups, thioaryl groups, sulfone groups, phosphoryl groups, carboxyl groups, carbonyl groups, thiocarbonyl groups, imino groups, hydroxy groups, amido groups, alkoxyl groups, cyano groups and the like.

The above-described hole transporting functional material can be used as a hole transporting layer of a one-layer, two-layer, or three-layer type organic EL device manufactured by a vapor deposition method.
In this case, the hole transport layer may be used in a form doped with a light emitting functional molecule, an electron transport functional molecule, and a hole transport functional molecule. Further, it can also be used as a hole transporting function material used for an organic layer of an organic EL device manufactured by a coating method such as dip coating or spin coating.
In this case, it can be used in the form of being dispersed in a matrix or alone. Further, the present hole transporting functional material can be applied to a method of forming a solid solution in a heat resistant matrix. In this case, the hole transport layer may be used in a form doped with a light emitting functional molecule, an electron transport functional molecule, and a hole transport functional molecule.

Examples of the binding of a triphenylamine multimer as the hole transporting function molecule of the present invention are shown below for a trimer.
It is shown in Formula 9. Formulas 10 to 12 show the tetramer. For trimers and smaller, there is only a linear bonding mode,
If it is a monomer or more, branching may occur. If it is a hexamer or more, there may be a plurality of branch points.

[0024]

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[0025]

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[0026]

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[0027]

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[0028]

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[0029]

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[0030]

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[0031]

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[0032]

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[0033]

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[0034]

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[0035]

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The trimer and tetramer can be bonded to the amino group by ortho, meta or para bonding, and there are isomers. In the case of a linear tetramer or trimer, the bond position is limited to a combination of meta and para,
Tables 1 and 2 summarize the possible isomers.

[0037]

[Table 1]

[0038]

[Table 2]

The synthesis of the triphenylamine multimer can be carried out by the Ullmann reaction of an aromatic amine with an aromatic iodide using a copper catalyst. In addition, triphenylamine halides, nickel,
The reaction can also be carried out by performing a coupling reaction using a palladium catalyst. For example, a bromide is used as a Grignard reagent, and another bromide and a nickel catalyst (Ni (dpp) C
It can be Kappurigu with l _2, etc.). Also,
After the bromide is lithiated using an alkyl lithium reagent, boric acid-derived bromide and another bromide can be coupled using a palladium catalyst (such as Pd (PPh ₃ ) ₄ ). In addition, bromide using zinc as a reducing agent,
Coupling can be performed using a nickel catalyst.

In the method of manufacturing an electroluminescent device according to the present invention, an organic layer and a second electrode are formed while maintaining a transparent substrate in a specific temperature range. That is, by holding the transparent substrate at a high temperature, moisture adsorbed on the ITO film surface formed on the surface of the transparent substrate can be removed, and the low molecular weight that has flew from the evaporation source during the film formation of the organic layer can be removed. Impurities (decomposed products) can be re-evaporated from the transparent substrate, and a high-purity organic layer can be formed. Also, the second metal electrode can be made dense by high-temperature film formation. As a result, permeation of moisture and oxygen through the electrode film is suppressed, and deterioration of the element can be suppressed.

The effective temperature of the transparent substrate is 80 ° C. or higher, and is preferably lower than the glass transition temperature of the organic substance to be deposited. Exceeding the glass transition temperature of the organic substance to be deposited is not preferred because crystallization of the organic layer occurs and the quality of the organic layer deteriorates. Table 3 shows the glass transition temperature of the hole transporting material forming the organic layer. On the other hand, if the temperature of the transparent substrate is lower than 80 ° C., the removal of low molecular impurities and the like from the transparent substrate becomes insufficient, which is not preferable.

By heating the transparent substrate to form a film, a high-purity organic layer can be formed and a dense metal second electrode can be formed, and the characteristics (luminance and efficiency) of the electroluminescent device can be improved. This has the advantage of extending the life of the device.

[0043]

[Table 3]

[0044]

The present invention will be specifically described below with reference to examples. (Synthesis Example of Hole Transport Function Molecule) (Synthesis Example 1) Synthesis of di (m-tolyl) 4-bromophenylamine 5.0 g of di (m-tolyl) amine, 7.20 g of 4-bromo-1-iodobenzene, A mixture of 0.1 g of copper powder, 0.1 g of copper oxide (1), 1.84 g of potassium hydroxide, 7 g of decalin, and 0.05 g of 18 crown 6 was heated and stirred at 160 ° C. for 8 hours under a nitrogen atmosphere. The product was purified by column chromatography to give 4.8 g of di (m-tolyl) bromophenylamine.

Synthesis of N, N, N ', N'-tetra (m-tolyl) benzidine Di (m-tolyl) was added to 18 mg of magnesium under a nitrogen stream.
10 ml of a tetrahydrofuran solution in which 500 mg of bromophenylamine was dissolved was added dropwise over 15 minutes. Then, after stirring for 3 hours, stirring was continued at 50 ° C. for 1.5 hours. The reaction mixture was cooled on ice, and then 10 mg of 1,3-di (diphenylphosphino) propane nickel (II) chloride was added.
Was added and left at room temperature for 50 hours. The reaction solution is concentrated, and the concentrated residue is dissolved in a solvent (by 1H-NMR quantification).
N, N, N ', N'-tetra (m-tolyl) benzidine (a dimer represented by Formula 13) was obtained at a yield of 75%.

[0046]

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Synthesis Example 2 Synthesis of 4- (N, N, -di (m-tolyl)) amino-4'-iodobiphenyl 2.5 g of m, m'-ditolylamine, 4,4'-diiodobiphenyl 5.14 g, potassium carbonate 1.93 g, copper powder 0.05 g, cuprous oxide 0.05 g, xylene 15
A mixture of 0.05 g of 18 crowns and 6 crowns was heated at 200 ° C. for 40 hours under a nitrogen stream at 200 ° C. in which a separation device for water and a reflux condenser were arranged. The reaction product was filtered, the solid was washed with chloroform and concentrated to dryness with the filtrate. The product is purified by column chromatography,
2.02 g of 4- (N, N-di (m-tolyl)) amino-4'-iodobiphenyl were obtained.

Synthesis of TPTR (trimer shown in Chemical Formula 14) 4- (N, N-di (m-tolyl)) amino-4'-iodobiphenyl 2.02 g, p-tolylamine 0.23
g, copper powder 0.02 g, cuprous oxide 0.02 g, potassium carbonate 0.65 g, xylene 20 g, 18 crown 6
0.02 g was heated at 200 ° C. for 40 hours under a nitrogen stream. The reaction product was filtered, the solid was washed with chloroform and concentrated to dryness with the filtrate. The product was purified by column chromatography and 0.52 g of TPTR (Chem.
Formula) was obtained. 10 ° C. by DSC (differential scanning calorimeter)
The Tg of TPTR when the temperature was increased at a rate of 95 ° C./min.

[0049]

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Synthesis Example 3 4-Synthesized in Example 2
(N, N-di (m-tolyl)) amino-4′-iodobiphenyl 1.50 g, N, N′-diphenylbenzine 0.52 g, copper powder 0.02 g, cuprous oxide 0.02
g, potassium carbonate 0.48 g, xylene 20 g, and 18 crown 6 0.02 g were heated at 200 ° C. for 46 hours in a nitrogen stream. The reaction product was filtered, the solid was washed with chloroform and concentrated to dryness with the filtrate. The product was purified by column chromatography to give 0.8 g of TPTR. Tg of TPTE (tetramer shown in Chemical Formula 15) when the temperature was raised at 10 ° C./min by DSC (differential scanning calorimeter)
Was 130 ° C.

[0051]

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(Synthesis Example 4) N, N'-diphenyl N,
DSC of N'-di (m-tolyl) benzine (TPD)
The Tg of the TPD (the dimer shown in Chemical Formula 16) when the temperature was raised at 10 ° C./min by a (differential scanning calorimeter) was 60 ° C.

[0053]

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Example 1 An electroluminescent device using the hole transporting molecule TPTE obtained in the above synthesis example as a hole transporting layer was manufactured. TPT on ITO electrode on glass substrate
E is 70 nm under the conditions of 1 × 10 ⁻⁷ Torr and 3 nm / min.
Evaporated. Subsequently, Alq (shown in Formula 17 of light emitting functional molecule) was applied under the conditions of 1 × 10 ⁻⁷ Torr and 3 nm / min.
nm. Then, an MgAg (10: 1) electrode was
180 nm was deposited under the conditions of × 10 ^-7 Torr and 13 nm / min.

[0055]

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An EL device using TPD (triphenylamine represented by Formula 18) as a hole transport function layer was manufactured. TPD (dimerization 13)
(Formula 16 or Formula 16) was deposited at 70 nm under the conditions of 1 × 10 ⁻⁷ Torr and 3 nm / min. Subsequently, 1 × 1 of Alq3 was added.
70 nm was deposited under the conditions of 0 ^-7 Torr and 3 nm / min.
Then, a MgAg (10: 1) electrode was placed at 5 × 10 ⁻⁷ Torr,
180 nm was deposited at 13 nm / min.

[0057]

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The electroluminescent device using the TPTE prepared above as a hole transport layer was driven at room temperature in a nitrogen gas atmosphere. The light emission starting voltage was about 3.5 V, and a maximum luminance of 5000 cd / m ² was obtained by applying 10 V. When the electroluminescent device was driven at 100 ° C. in a nitrogen gas atmosphere,
The light emission starting voltage is about 2.2 V and the maximum luminance is 250 when 9 V is applied.
0 cd / m ² was obtained.

(Comparative Example 1) An EL device having a hole transport layer using TPD (formula 13 or formula 16) produced under the production conditions of Example 1 was driven at 60 ° C. in a nitrogen gas atmosphere. However, the element did not emit light at all due to dielectric breakdown. (Example 3) An EL device having a hole transport layer made of TPTE manufactured under the manufacturing conditions of Example 1 was driven at room temperature under a nitrogen gas atmosphere under a constant current condition. The luminance half life when driven at 11 mA / cm ² was 400 hours. 33m
The luminance half life when driven at A / cm ² was 100 hours. The luminance half life when driven at 110 mA / cm ² was 4 hours.

(Comparative Example 2) An electroluminescent device having a hole transport layer made of TPD (dimerization formula 13 or 16) manufactured under the manufacturing conditions of Example 1 was driven under a constant current condition in a nitrogen gas atmosphere. Was. The luminance half life when driven at 11 mA / cm ² was 100 hours. (Example 4) Substrate temperature on glass substrate with ITO 10
The temperature was set to 0 ° C., and triphenylamine tetramer (TPTE) was added at 500 ° C. by a vacuum evaporation method, and a quinolinol aluminum complex (A
An organic layer was formed by forming a film of lq-formula 17) at 500 °. Finally, a second electrode of MgAg was deposited at 2000 °.

The device was driven in a nitrogen atmosphere at a driving current of 10
When emitted at mA / cm ² , a high initial luminance of 300 cd / m ² was obtained. The device life under continuous driving (10 mA / cm ² ) was able to be achieved for about 1500 hours. (Comparative Example 3) On a glass substrate with ITO at room temperature,
500 [deg.] Of triphenylamine tetramer (TPTE) was obtained by a vacuum evaporation method, and a quinolinol aluminum complex (Alq-formula 17 formula 2)
(Shown) was deposited at 500 °. Finally, the MgAg electrode is
00Å was deposited.

The device was driven in a nitrogen atmosphere at a drive current of 10
When emitted at mA / cm ² , the initial luminance was 200 cd
/ M ² . When the device life under continuous driving (10 mA / cm ² ) was measured, the half life was able to be achieved about 500 hours. (Example 5) A substrate temperature of 13 was formed on a glass substrate with ITO.
The temperature was set to 0 ° C., and triphenylamine tetramer (TPTE) was added at 500 ° C. by a vacuum evaporation method, and a quinolinol aluminum complex (A
(shown in Formula 17) was deposited at 500 °. Finally Mg
An Ag electrode was deposited at 2000 °.

The device was driven at a driving current of 10
When emitted at mA / cm ² , a high initial luminance of 320 cd / m ² was obtained. The device life under continuous driving (10 mA / cm ² ) was able to be achieved in about 2000 hours. (Comparative Example 4) On a glass substrate with ITO at room temperature,
By a vacuum evaporation method, triphenylamine tetramer (TPTE) was formed at a film thickness of 500 °, and a quinolinol aluminum complex (Alq-formula 17) was formed at a film thickness of 500 °. Finally, the MgAg electrode is
00Å was deposited.

The device was driven in a nitrogen atmosphere at a driving current of 10
When emitted at mA / cm ² , the initial luminance was 150 cd
/ M ² . When the device life under continuous driving (10 mA / cm ² ) was measured, the half life was able to be achieved about 300 hours.

[0065]

According to the present invention, the multimer having a hole transport function molecule as a basic unit can maintain its amorphous state without crystallization even when the hole transport function layer is kept at a high temperature for a long time. In particular, a compound having high heat resistance can be obtained by increasing the degree of multiplication of triphenylamine. Further, according to the manufacturing method of the present invention, since the hole transporting functional layer is formed in a specific temperature range in the vapor deposition method, it is possible to form a high-purity hole transporting functional layer containing no impurities. For this reason, the organic electroluminescent device using the hole transport function material,
The initial properties, heat resistance, and durability are excellent.

Continuing from the front page (72) Shizuto Tokito, Inventor 41, Toyota Chuo Research Institute, Inc. 41 No. 1 inside Toyota Central Research Institute, Inc. (72) Inventor Koji Noda 41 No. 1 inside Toyota Central Research Institute Co., Ltd.

Claims (2)

[Claims] 1. A transparent first electrode and an organic layer mainly composed of an organic compound which emits light upon application of a voltage on a transparent substrate,
In the electroluminescent device in which the second electrode and the second electrode are sequentially laminated, the organic layer has a hole transport function molecule having an aromatic ring as a basic unit, and the aromatic rings of the basic unit are directly or unsaturated side chains. An electroluminescent device comprising a multimer having a bond formed through the polymer. 2. A transparent first electrode and an organic layer mainly composed of an organic compound which emits light upon application of a voltage, on a transparent substrate,
In a method for manufacturing an electroluminescent device, wherein a second electrode and a second electrode are sequentially laminated by vapor deposition, wherein the organic layer and the second electrode have a temperature of the transparent substrate of 80 ° C. or higher and a glass transition temperature of an organic material to be vapor deposited or lower. A method for manufacturing an electroluminescent device, wherein the device is formed by vapor deposition while maintaining the temperature.