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Organic electric field light emitting element and production therefor

a technology of light-emitting elements and organic electric fields, which is applied in the direction of luminescent compositions, thermoelectric devices, chemistry apparatuses and processes, etc., can solve the problems of difficult control of the degree of polymerization and the molecular weight distribution of high molecular weight materials, and the wet coating process is not developed to a practical level. , to achieve the effect of satisfactory operating life and excellent luminous efficiency

Inactive Publication Date: 2011-09-08
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]An object of the present invention is to provide an organic electroluminescent device which has an organic light emitting layer formed by wet coating process, enables charges to be injected from electrodes into the organic light emitting layer satisfactorily, and shows an excellent luminous efficiency and a satisfactory operating life.

Problems solved by technology

The wet coating process, however, has following problems, and most devices formed by wet coating process are not developed to a practical level, except for those using some high molecular weight materials.
It is difficult to control the degrees of polymerization and the molecular weight distributions of high molecular weight materials (polymerized organic compounds).
When devices are operated continuously, terminal residues cause deterioration of the devices.
It is difficult to purify high molecular weight materials highly, and the resulting materials may contain impurities.
The resulting devices, however, operate at high drive voltages and have insufficient luminous efficiencies, because holes and electrons are not sufficiently injected from the anode and cathode, respectively.
Oxadiazole derivatives used as the electron transport material are insufficient in drive stability (operation stability) and thereby insufficient in operating life.
In addition, it is difficult to adopt a phosphorescent material or a blue-emitting material as a luminescent material, because the resulting luminescent material has a large energy gap.Patent Document 1: Japanese Patent No. 3069139Patent Document 2: Japanese Unexamined Patent Application Publication No. 11-273859

Method used

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  • Organic electric field light emitting element and production therefor
  • Organic electric field light emitting element and production therefor
  • Organic electric field light emitting element and production therefor

Examples

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Effect test

example 1

Device Preparation 1

[0409]An indium-tin oxide (ITO) transparent electroconductive film deposited to a thickness of 150 nm on a glass substrate (supplied from Sanyo Vacuum Industries Co., Ltd., sputtered film) was patterned in a 2-mm width stripe pattern using a common photolithography technique and etching with hydrochloric acid-iron chloride solution thereby forming an anode. The patterned ITO substrate was rinsed by sequentially carrying out ultrasonic cleaning in an aqueous surfactant solution and rinsing with pure water, followed by drying in dried nitrogen gas, and UV / ozone cleaning. In addition, a composition for an organic electroluminescent device was prepared by mixing 90 mg of the compound (T1), 90 mg of the compound (T2), and 9 mg of the compound (D1), each represented by the structural formula, and 2.8 g of chlorobenzene as a solvent, and removing insoluble matter by filtration through a PTFE membrane filter having a pore size of 0.2 μm. The composition was applied to th...

example 2

Device Preparation 2

[0420]A composition for an organic electroluminescent device was prepared by mixing 90 mg of the compound (T3), 90 mg of the compound (T4), and 9 mg of the compound (D1), each represented by the structural formula, and 2.8 g of o-dichlorobenzene as a solvent, and removing insoluble matter by filtration through a PTFE membrane filter having a pore size of 0.2 μm. In addition, an ITO substrate was patterned and rinsed in the same manner as with Example 1. The composition was applied to the resulting ITO substrate by spin coating under the following conditions to thereby form a uniform thin film having a thickness of 160 nm.

[0421]Revolution number of spinner: 1500 rpm

[0422]Revolution time of spinner: 30 seconds

[0423]Spinning atmosphere: spinning was conducted in the atmosphere at a temperature of 23° C. and relative humidity of 30%

[0424]Drying condition: drying by heating on a hot plate at 80° C. for 1 minutes and further drying by heating in an oven at 140° C. for ...

example 3

Device Preparation 3

[0431]Initially, an ITO substrate was patterned and rinsed in the same manner as with Example 2 and was immersed in a solution for five minutes. The solution was a 5 mM solution of the compound (ST1) represented by the following structural formula in dichloromethane. The substrate was then taken out from the solution, rinsed with dichloromethane for one minute, and was dried using a nitrogen blow. Thus, surface treatment of the ITO anode was conducted.

[0432]A composition for an organic electroluminescent device was prepared by mixing 60 mg of the compound (T3), 10 mg of the compound (T4), 4 mg of the compound (D1), and 2 g of o-dichlorobenzene as a solvent, and removing insoluble matter by filtration through a PTFE membrane filter having a pore size of 0.2 μm. The composition was applied to the surface treated ITO substrate by spin coating under the condition as with Example 2 to form a uniform thin film having a thickness of 160 nm.

[0433]Next, sodium was deposit...

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Abstract

A composition for an organic electroluminescent device is a composition for forming an organic light emitting layer of an organic electroluminescent device by wet coating process. The composition contains a phosphorescent material, a charge transport material, and a solvent, in which the phosphorescent material and the charge transport material are each an unpolymerized organic compound, and the first oxidation potential of the phosphorescent material ED+, the first reduction potential of the phosphorescent material ED−, the first oxidation potential of the charge transporting material ET+, and the first reduction potential of the charge transporting material ET− satisfy the following condition:ET−+0.1≦ED−<ET+≦ED+−0.1 or ED−+0.1≦ET−<ED+≦ET+−0.1.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a composition for an organic electroluminescent device which can easily yield an organic electroluminescent device through wet coating process, and the resulting organic electroluminescent device has an excellent luminous efficiency and a satisfactory operating life. It also relates to a thin film for an organic electroluminescent device, a transfer member for a thin film for an organic electroluminescent device, and an organic electroluminescent device, each of which is formed by using the composition for an organic electroluminescent device. In addition, it relates to a method of manufacturing the organic electroluminescent device.BACKGROUND OF THE INVENTION[0002]There have been developed electroluminescent devices using organic thin films (organic electroluminescent devices). Materials for organic electroluminescent devices can be roughly classified into low molecular weight materials and high molecular weight materials...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01L51/52C09K11/06
CPCC09K11/06C09K2211/185H01L51/0059H01L51/0067H05B33/14H01L51/0085H01L51/5016H01L51/5048H01L51/0072C09K11/025H10K85/631H10K85/654H10K85/6572H10K85/342H10K50/11H10K2101/10H10K50/14H10K50/00H10K85/60H10K85/111H10K85/322H10K85/324H10K85/615H10K85/626H10K85/636H10K50/16H10K50/17H10K50/18H10K71/15C09K2211/1007C09K2211/1029
Inventor YABE, MASAYOSHIOGATA, TOMOYUKISATO, HIDEKIIIDA, KOICHIROTANAKA, ASATOTANAMURA, MITSURUKAWAMURA, YUICHIROISHIKAWA, HIRONORIOKABE, KAZUKI
Owner MITSUBISHI CHEM CORP
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