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Light emitting device and a method of manufacturing thereof

A technology of a light-emitting device and a manufacturing method, which are applied in the directions of light-emitting materials, lighting devices, electroluminescent light sources, etc., to achieve the effect of improving characteristics and reliability

Inactive Publication Date: 2006-08-30
SEMICON ENERGY LAB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0031] That is, polymer-based hole injecting materials have advantages in that low-cost, simple ink-jet or spin coating methods can be used, and that the characteristics of EL elements can be improved. However, the polymer-based hole-injecting materials used so far Injection material, fundamentally has big problems as mentioned before, needs further improvement

Method used

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  • Light emitting device and a method of manufacturing thereof
  • Light emitting device and a method of manufacturing thereof
  • Light emitting device and a method of manufacturing thereof

Examples

Experimental program
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Effect test

Embodiment approach 1

[0055] This embodiment mode shows the structure of the above-mentioned conjugated polymer used as a hole injection material. The compound represented by formula (1) is a polythiophene derivative. In order to increase the solubility to organic solvents, the substituent R 1 , R 2 It may be an alkyl group having 4 or more carbon atoms having a linear or branched structure, preferably an aliphatic hydrocarbon group having a linear or branched structure having 4 to 6 carbons, or an alicyclic hydrocarbon group having 4 to 6 carbons. Alternatively, a benzene ring having an aliphatic hydrocarbon group or an alicyclic hydrocarbon group, or a condensed aromatic ring may be introduced. In addition, an electron-deficient heteroaromatic ring such as a pyridine ring or a quinoxaline ring may also be introduced, and an aliphatic hydrocarbon group having 4 or more carbons or an alicyclic hydrocarbon group having 4 to 10 carbons may be introduced into the heteroaromatic ring. The polymers o...

Embodiment approach 2

[0065] Next, an electron-accepting organic compound that oxidizes a conjugated polymer used as a hole injection material described in Embodiment 1, that is, an electron-accepting organic compound that is a dopant doped in the above-mentioned conjugated polymer will be described. . In addition, the doping method thereof will be described.

[0066] Formulas (2) to (9) are examples of electron-accepting organic compounds used to oxidize the above-mentioned conjugated polymers. In order to rapidly oxidize the main chain of the conjugated polymer, it is preferable to use an electron-accepting unsaturated compound or an aromatic compound. In addition, since the solubility in highly polar organic solvents is often improved by doping with a conjugated polymer, it is less necessary to introduce an alkyl side chain or the like into an electron-accepting organic compound. In addition, as the electron-accepting organic compound, a polymer having a side chain introduced by an organic com...

Embodiment approach 3

[0071] In this embodiment mode, a method of laminating each functional layer on a substrate after forming a film of a hole injection material manufactured using the materials and methods described in Embodiment Modes 1 and 2 will be described.

[0072] As the substrate coated with ITO, not only quartz or glass, but also paper, plastic resin, and the like can be used. In addition, a substrate on which TFTs are mounted in advance may also be used. Using the conjugated polymers and electron-accepting organic compounds described in Embodiments 1 and 2, the hole injection material is produced by the method described in Embodiment 1, and at least one hole injection layer is laminated on the substrate.

[0073] The functional layers are then laminated. The functional layer includes, for example, a hole-transporting layer, a light-emitting layer, an electron-transporting layer, an electron-injecting layer, a hole-blocking layer, and an electron-blocking layer. In order to be in conta...

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Abstract

An EL element is provided in which a conjugate polymer that has a polythiophene derivative, a polyaniline derivative, a polypyrrole derivative or a polyfuran derivative as a fundamental skeleton and is soluble in an organic solvent is oxidized in its main chain with a dopant of an electron-accepting organic molecule that does not contain an acid component, and the doped conjugate polymer is used as a material to form a hole injecting layer. The polymer, being soluble in an organic solvent, can be formed in film even on a substrate high in the water repellency; that is, it can be easily formed in film on a TFT substrate and the like indispensable for an active matrix display device. Furthermore, since a dopant that does not contain an acid component is used, influence on an organic thin film and an electrode that are in contact with the hole injecting layer can be suppressed to the minimum level.

Description

technical field [0001] The present invention relates to a display device in which a thin film emitting light by a phenomenon called "electroluminescence" (hereinafter referred to as "EL") is sandwiched between an anode, a cathode, and between the above-mentioned anode and cathode, so that the above-mentioned structure An element (hereinafter referred to as "light emitting element") is provided on a substrate; and an electronic device in which the light emitting element is provided on an image display portion. Background technique [0002] Video display monitors are an indispensable display device in modern life. There are various types of displays depending on the application, starting from the so-called TV monitor, to the liquid crystal display that has developed rapidly in recent years, and to the organic EL display that is expected to develop in the future. Various forms. In particular, liquid crystal displays and EL displays are light-emitting elements driven at low vol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/14H05B33/22H01L51/00H01L51/30H01L51/40H01L51/50H05B33/26
CPCH01L51/5096H01L51/002H01L51/0036H01L51/5088H01L51/0051H01L51/005H01L51/0077Y10S428/917H10K71/30H10K85/113H10K85/611H10K85/60H10K85/30H10K50/17H10K50/18H05B33/22C09K11/06H05B33/14
Inventor 德田笃史高须贵子濑尾哲史野村亮二
Owner SEMICON ENERGY LAB CO LTD
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