Material having indolocarbazole compound for phosphorescent light-emitting element and organic electroluminescent element using the same

Patent metadata

Field	Value
Publication number	US-8962158-B2
Application number	US-201013256363-A
Country	US
Kind code	B2
Filing date	Mar 25, 2010
Priority date	Mar 31, 2009
Publication date	Feb 24, 2015
Grant date	Feb 24, 2015

Abstract

Provided is an organic electroluminescent device (organic EL device), which has improved luminous efficiency, has sufficient driving stability, and has a simple construction. The organic EL device of the present invention is an organic electroluminescent device, including a light-emitting layer and a hole-transporting layer between an anode and a cathode laminated on a substrate, in which the light-emitting layer contains a phosphorescent light-emitting dopant and an indolocarbazole compound that serves as a host material, or alternatively, the hole-transporting layer contains an indolocarbazole compound. The indolocarbazole compound is represented by the following formula (1). In the formula: A 1 's each represent an aromatic hydrocarbon group or an aromatic heterocyclic group, provided that at least one of A 1 's has a fused ring structure; and R 1 's each represent a hydrogen atom, an alkyl group, an alkoxy group, or an acyl group.

First claim

The invention claimed is:

1. A material for a phosphorescent light-emitting device, said material comprising an indolocarbazole compound represented by the following general formula (1):

wherein in the formula (1):
each of A 1 's independently represents an aromatic hydrocarbon group having 6 to 50 carbon atoms, an aromatic heterocyclic group having 3 to 50 carbon atoms, an alkyl group having 1 to 10 carbon atoms, or a cycloalkyl group having 3 to 11 carbon atoms, provided that one or both of A 1 's represent an aromatic heterocyclic group represented by the following formula (1b) and represent no aromatic heterocyclic group represented by the following formula (1a); and
each of R 1 's independently represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an acyl group having 2 to 6 carbon atoms:

wherein in the formula (1a), each of X's independently represents a methine group or a nitrogen atom, and at least one of X's in a ring including three X's represents a nitrogen atom;
wherein in the formula (1b), Y represents —NA 4 - or —S—; and
wherein in the formulae (1a) and (1b), A 2 's, A 3 , and A 4 each independently represents an aromatic hydrocarbon group having 6 to 38 carbon atoms, an aromatic heterocyclic group having 3 to 37 carbon atoms, an alkyl group having 1 to 10 carbon atoms, or a cycloalkyl group having 3 to 11 carbon atoms.

2. An organic electroluminescent device, comprising an anode, a plurality of organic layers, and a cathode laminated on a substrate, wherein the organic electroluminescent device comprises an organic layer containing the material for a phosphorescent light-emitting device according to claim 1 .

3. An organic electroluminescent device according to claim 2 , wherein the organic layer containing the material for a phosphorescent light-emitting device comprises at least one layer selected from the group consisting of a light-emitting layer, a hole-transporting layer, an electron-transporting layer, and a hole-blocking layer.

4. An organic electroluminescent device according to claim 3 , wherein the organic layer containing the material for a phosphorescent light-emitting device comprises a light-emitting layer containing a phosphorescent light-emitting dopant.

5. An organic electroluminescent device according to claim 3 , wherein the organic layer containing the material for a phosphorescent light-emitting device comprises a hole-transporting layer.

6. The material for a phosphorescent light-emitting device according to claim 1 , wherein both of A 1 's independently represent the aromatic heterocyclic group represented by formula (1b).

Assignees

• Komori Masaki
• Kai Takahiro
• Yamamoto Toshihiro
• Nippon Steel & Sumikin Chem Co

Inventors

• Komori Masaki
• Kai Takahiro
• Yamamoto Toshihiro

Classifications

• H01L51/0072

  Electricity · mapped topic

• C09K2211/1044

  containing two nitrogen atoms as heteroatoms · CPC title

• C07D487/04 Primary

  Ortho-condensed systems · CPC title

• H01L51/0058

  Electricity · mapped topic

• C09K2211/1011

  Condensed systems · CPC title