Charge transporting varnish

Patent metadata

Field	Value
Publication number	US-2020020860-A1
Application number	US-201816483986-A
Country	US
Kind code	A1
Filing date	Feb 5, 2018
Priority date	Feb 7, 2017
Publication date	Jan 16, 2020
Grant date	—

Abstract

Provided is a charge transporting varnish comprising: a charge transporting substance such as an aniline derivative and a thiophene derivative; an onium borate salt such as a compound represented by the formula; and an organic solvent.

First claim

1 . A charge-transporting varnish comprising: a charge-transporting material, an onium borate salt, and an organic solvent, wherein
the onium borate salt includes an onium borate salt including a monovalent or divalent anion represented by formula (a1) and a counter cation represented by formulae (c1) to (c5) (provided that the salt is an electrically neutral salt):

wherein Ar's, independently of each other, represent an aryl group which may have a substituent or a heteroaryl group which may have a substituent, and L represents an alkylene group, —NH—, an oxygen atom, a sulfur atom, or —CN + —,

2 . The charge-transporting varnish of claim 1 , wherein Ar is an aryl group having one or two or more electron-withdrawing substituents.

3 . The charge-transporting varnish of claim 2 , wherein the electron-withdrawing substituent is a halogen atom.

4 . The charge-transporting varnish of claim 1 , wherein the anion is represented by formula (a2):

5 . The charge-transporting varnish of claim 4 , wherein the onium borate salt is represented by the following formula:

6 . The charge-transporting varnish of claim 1 , wherein the charge-transporting material is at least one selected from an aniline derivative and a thiophene derivative.

7 . The charge-transporting varnish of claim 6 , wherein the charge-transporting material is the aniline derivative.

8 . A charge-transporting thin film, obtained from the charge-transporting varnish of claim 1 .

9 . An organic electroluminescent device, comprising the charge-transporting thin film of claim 8 .

10 . A method of producing a charge-transporting thin film, the method comprising applying the charge-transporting varnish of claim 1 on a substrate, and evaporating a solvent.

11 . An onium borate salt, included in any one of a hole injection layer, a hole transport layer, and a hole injection/transport layer in an organic electroluminescent device, the onium borate salt comprising a monovalent or divalent anion represented by formula (a1) and a counter cation represented by formulae (c1) to (c5) (provided that the salt is an electrically neutral salt):

wherein Ar's, independently of each other, represent an aryl group which may have a substituent or a heteroaryl group which may have a substituent, and L represents an alkylene group, —NH—, an oxygen atom, a sulfur atom, or —CN + —,

12 . The onium borate salt of claim 11 , wherein Ar is an aryl group having one or two or more electron-withdrawing substituents.

13 . The onium borate salt of claim 12 , wherein the electron-withdrawing substituent is a halogen atom.

14 . The onium borate salt of claim 11 , wherein the anion is represented by formula (a2):

15 . The onium borate salt of claim 14 , wherein the onium borate salt is represented by the following formula:

Assignees

• Nissan Chemical Corp

Inventors

• Nakaie Naoki
• Maeda Daisuke

Classifications

• C07F5/025

  Boronic and borinic acid compounds · CPC title

• C07D209/88

  with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to carbon atoms of the ring system · CPC title

• C07C381/12

  Sulfonium compounds · CPC title

• C09D5/24

  Electrically-conducting paints {(conductive materials H01B1/00)} · CPC title

• C07F5/02

  Boron compounds · CPC title