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Charge-transporting varnish

A technology of charge transport and varnish, applied in the direction of circuits, electric light sources, electrical components, etc., to achieve excellent durability

Active Publication Date: 2017-03-22
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, improvement is often demanded for wet process materials for hole injection layers, and there is still room for improvement in the so-called durability of organic EL devices including the thin film of Patent Document 4.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0116] In a nitrogen atmosphere, 0.211 g of N,N'-bis(1-naphthyl)benzidine and 0.218 g of arylsulfonic acid represented by the formula (A1) were dissolved in 1,3-dimethyl-2-imidazolidine Ketone (hereinafter abbreviated as DMI) 15g. 3.0 g of cyclohexanol (hereinafter abbreviated as CHA) and 3.0 g of propylene glycol (hereinafter abbreviated as PG) were added thereto and stirred to prepare a charge-transporting varnish.

[0117] In addition, the aryl sulfonic acid represented by formula (A1) was synthesize|combined according to the description of International Publication No. 2006 / 025342 (the same applies below).

[0118] [chemical 4]

[0119]

Embodiment 1-2

[0121] In a nitrogen atmosphere, 0.143 g of N,N'-bis(1-naphthyl)benzidine, 0.200 g of arylsulfonic acid represented by the above formula (A1), and 0.086 g of phosphotungstic acid were dissolved in 15 g of DMI. 3.0 g of CHA and 3.0 g of PG were added thereto, stirred, and a charge-transporting varnish was prepared.

Embodiment 2-1

[0126] The charge-transporting varnish prepared in Example 1-1 was coated on an ITO substrate using a spin coater, then dried at 80°C for 1 minute, and then baked at 230°C for 15 minutes in an air atmosphere , forming a uniform thin film of 30nm on the ITO substrate. As the ITO substrate, a 25 mm × 25 mm × 0.7t glass substrate with a pattern of film thickness of 150 nm formed on the surface of indium tin oxide (ITO) was used. 2 A plasma scrubber (150W, 30 seconds) removes impurities on the surface.

[0127] Next, use a vapor deposition device (vacuum degree 1.0×10 -5 Pa), on the ITO substrate on which the thin film was formed, N,N'-bis(1-naphthyl)-N,N'-diphenylbenzidine (α-NPD), tris(8-hydroxyquinoline) Phenyl)aluminum(III)(Alq 3 ), lithium fluoride, and a thin film of aluminum to obtain an organic EL element. At this time, according to α-NPD, Alq 3 Aluminum and aluminum were deposited at a deposition rate of 0.2 nm / sec, and lithium fluoride at a deposition rate of 0.02 n...

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Abstract

A charge-transporting varnish according to the present invention includes a charge-transporting substance, a dopant substance, and an organic solvent, wherein the charge-transporting substance contains at least one selected from N,N'-di(1-naphthyl)benzidine, N,N'-di(2-naphthyl)benzidine, and N-(1-naphthyl)-N'-(2-naphthyl)benzidine. The charge-transporting varnish allows formation of a charge-transporting thin film with which an organic EL element excellent in durability can be achieved when the charge-transporting thin film is applied to a hole injection layer.

Description

technical field [0001] The present invention relates to a charge-transporting varnish, and more specifically, to a charge-transporting varnish containing N,N'-dinaphthylbenzidine as a charge-transporting substance. Background technique [0002] Organic electroluminescent (EL) elements are expected to be put into practical use in the fields of displays and lighting, etc., and in order to achieve low-voltage driving, high brightness, and long life, various materials and element structures have been studied. develop. [0003] A variety of functional thin films are used in organic EL elements, and the hole injection layer, one of them, is responsible for the transfer and reception of charges between the anode and the hole transport layer or light-emitting layer, and plays a role in realizing the low voltage of organic EL elements. Important features for drive and high brightness. [0004] The method of forming the hole injection layer is roughly classified into a dry method re...

Claims

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Application Information

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IPC IPC(8): H01L51/50H05B33/10
CPCH10K71/12H10K71/30H10K85/633H10K50/155H10K50/17H10K85/631H10K85/626
Inventor 中家直树
Owner NISSAN CHEM IND LTD