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Aromatic amine derivative and organic electroluminescent device using same

A technology of derivatives and aromatic amines, applied in electroluminescent light sources, electrical components, electric light sources, etc., can solve problems such as large molecular weight, easy decomposition, and insufficiently long life

Inactive Publication Date: 2007-08-15
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the life of the element is not sufficiently long, and further improvement is still required
[0006] In addition, if the diaminopyrene derivatives described in JP-A-4-175395 are used as a dopant material to make an organic EL element, although an organic EL element with high luminous efficiency can be obtained, the life is not sufficiently long, and further improvement is required.
In addition, the 1,6-substituted diaminopyrene compound is exemplified in JP-A-10-251633, but when this compound is used as a light-emitting material, its molecular weight is relatively large, and it is easily decomposed during vapor deposition.

Method used

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  • Aromatic amine derivative and organic electroluminescent device using same
  • Aromatic amine derivative and organic electroluminescent device using same
  • Aromatic amine derivative and organic electroluminescent device using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] A transparent electrode made of indium tin oxide with a film thickness of 120 nm was provided on a glass substrate with a size of 25×75×1.1 mm. The glass substrate was irradiated with ultraviolet rays and ozone, and after cleaning, the substrate was placed on a vacuum deposition apparatus.

[0089] First, 60nm thick N',N"-bis[4-(diphenylamine)phenyl]-N',N"-diphenylbiphenyl-4,4'-diamine was evaporated as a hole injection layer, Then N,N,N',N'-tetrakis(4-biphenyl)-4,4'-benzidine was vapor-deposited on it with a thickness of 20nm as a hole transport layer.

[0090] Next, use 10,10'-bis[1,1',4',1"]terphenyl-2-yl-9,9'-bianthracene as the luminescent material, and use the above compound (5) as the dopant material , and vapor-deposited simultaneously at a weight ratio of 40:2 to form a light-emitting layer with a thickness of 40 nm.

[0091] Then, tris(8-quinolinolato)aluminum was evaporated to a thickness of 10 nm as an electron injection layer. Lithium fluoride was then e...

Embodiment 2

[0094] An organic EL device was fabricated under the same conditions as in Example 1 except that the compound (6) was used instead of the compound (5).

[0095] Carry out a current conduction test on the obtained element, and obtain a voltage of 6.9V and a current density of 10mA / cm 2 , Luminous brightness 970cd / m 2 blue light (luminescence maximum wavelength: 477nm). Perform an initial brightness of 3,000cd / m 2 After the DC continuous energization test, the half-reduced life is 2,100 hours.

Embodiment 3

[0097] In addition to being used as a light-emitting layer, 10-(4-(naphthalene-1-yl)phenyl)-9-(naphthalene-3-yl)anthracene is used to replace 10,10'-bis[1,1',4 ', 1 "] terphenyl-2-yl-9,9'-bianthracene, use above-mentioned compound (15) to replace compound (5) in doping material, all the other conditions are the same as embodiment 1, make organic EL elements.

[0098] The obtained element was subjected to a power-on test to obtain a voltage of 6.8V and a current density of 10mA / cm 2 , Luminous brightness 902cd / m 2 blue light (luminescence maximum wavelength: 472nm). Perform an initial brightness of 3,000cd / m 2 After the DC continuous energization test, the half-reduced life is 1,900 hours.

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Abstract

An aromatic amine derivative having a specific structure in which diphenylamino groups having substituents are bonded with the unsubstituted pyrene structure, and an organic electroluminescence device comprising an organic thin film layer which comprises one layer or a plurality of layers comprising at least a light emitting layer and is disposed between an anode and a cathode, wherein at least one layer in the organic thin film layer comprises the aromatic amine derivative described above singly or as a component of a mixture. The organic electroluminescence device has a long life and emits blue light with a great efficiency. The aromatic amine derivative enables to obtain the device.

Description

technical field [0001] The present invention relates to an organic electroluminescence element with long service life and high luminous efficiency used as a light source such as a plane illuminant of a wall-mounted TV or a backlight of a display, and a novel aromatic amine derivative for realizing the element. Background technique [0002] Organic electroluminescent (EL) elements using organic substances are considered highly promising as solid-state light-emitting type inexpensive, large-area full-color display elements, and many developments have been made. Generally, an EL element is composed of a light emitting layer and a pair of counter electrodes sandwiching this layer. Light emission is a phenomenon in which electrons are injected from the cathode side and holes are injected from the anode side when an electric field is applied between the two electrodes. Further, the electrons recombine with holes in the light-emitting layer to form an excited state, and when the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/61C09K11/06H05B33/14
CPCC09K2211/1011H01L51/5012C07C211/61H01L51/0054C09K2211/1007H05B33/14C09K11/06H01L51/006C09K2211/1014H01L51/0058H10K85/622H10K85/626H10K85/633H10K50/11
Inventor 舟桥正和
Owner IDEMITSU KOSAN CO LTD
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