Material for organic electroluminescent elements, and organic electroluminescent element using same

Patent metadata

Field	Value
Publication number	US-9978963-B2
Application number	US-201415023797-A
Country	US
Kind code	B2
Filing date	Aug 28, 2014
Priority date	Sep 30, 2013
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

Provided are an organic electroluminescent device (organic EL device) that is improved in luminous efficacy, sufficiently secures driving stability, and has a simple construction, and a material for organic EL devices to be used in the organic EL device. The material for organic EL devices is a material for organic EL devices formed of an ortho-carborane compound having a structure in which a silyl group (—SiR 3 ) is bonded to a divalent ortho-carborane group represented by C 2 B 10 H 10 through an aromatic group. In addition, the organic electroluminescent device is an organic electroluminescent device having a structure in which an anode, an organic layer, and a cathode are laminated on a substrate, the device having an organic layer containing the ortho-carborane compound, and the organic layer being a light-emitting layer, an electron-transporting layer, a hole-blocking layer, or an exciton-blocking layer.

First claim

The invention claimed is:

1. A material for organic electroluminescent devices, comprising an ortho-carborane compound represented by the general formula (1):

where ring A represents a divalent ortho-carborane group C 2 B 10 H 10 represented by the formula (1a), L 1 and L 2 each independently represent a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 carbon atoms, a substituted or unsubstituted aromatic heterocyclic group having 3 to 30 carbon atoms, or a linked aromatic group formed by linking 2 to 6 aromatic rings selected from the aromatic hydrocarbon group and the aromatic heterocyclic group, when L 1 or L 2 represents the linked aromatic group, the group may be linear or branched, and the aromatic rings to be linked may be identical to or different from each other, and L 1 represents a p+1-valent group and L 2 represents a q+1-valent group, R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 each independently represent an aliphatic hydrocarbon group having 1 to 12 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group having 6 to 18 carbon atoms, or a substituted or unsubstituted aromatic heterocyclic group having 3 to 17 carbon atoms, R 7 and R 8 each independently represent hydrogen, an aliphatic hydrocarbon group having 1 to 12 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group having 6 to 18 carbon atoms, or a substituted or unsubstituted aromatic heterocyclic group having 3 to 17 carbon atoms, p represents an integer of from 1 to 5, q represents an integer of from 0 to 5, and r represents an integer of from 1 to 4.

2. A material for organic electroluminescent devices according to claim 1 , wherein the ortho-carborane compound represented by the general formula (1) comprises an ortho-carborane compound represented by the general formula (2):

where L 1 , L 2 , R 1 to R 8 , p, q, and r are identical in meaning to those in the general formula (1).

3. A material for organic electroluminescent devices according to claim 2 , wherein in the general formula (2), L 1 and L 2 each independently represent a substituted or unsubstituted aromatic hydrocarbon group having 6 to 18 carbon atoms, a substituted or unsubstituted aromatic heterocyclic group having 3 to 17 carbon atoms, or a linked aromatic group formed by linking 2 to 6 aromatic rings selected from the aromatic hydrocarbon group and the aromatic heterocyclic group.

4. A material for organic electroluminescent devices according to claim 3 , wherein in the general formula (2), R 1 to R 6 each independently represent an aliphatic hydrocarbon group having 1 to 10 carbon atoms, or an aromatic hydrocarbon group having 6 to 12 carbon atoms.

5. An organic electroluminescent device having a structure in which an anode, an organic layer, and a cathode are laminated on a substrate, wherein the organic layer comprises an organic layer containing the material for organic electroluminescent devices of claim 1 .

6. An organic electroluminescent device according to claim 5 , wherein the organic layer containing the material for organic electroluminescent devices comprises at least one layer selected from the group consisting of a light-emitting layer, an electron-transporting layer, a hole-blocking layer, and an exciton-blocking layer.

7. An organic electroluminescent device according to claim 5 , wherein the organic layer containing the material for organic electroluminescent devices comprises an electron-transporting layer, a hole-blocking layer, or an exciton-blocking layer.

Assignees

• Nippon Steel & Sumikin Chem Co

Inventors

• UEDA Tokiko
• Ogawa Junya
• Kai Takahiro

Classifications

• C07F7/0814 Primary

  said ring is substituted at a C ring atom by Si · CPC title

• C09K2211/1096

  containing other heteroatoms · CPC title

• C07F7/0803

  Compounds with Si-C or Si-Si linkages · CPC title

• C09K11/06 Primary

  containing organic luminescent materials · CPC title

• H01L51/0094 Primary

  Electricity · mapped topic