Organic electroluminescent element, display device and lighting device

Patent metadata

Field	Value
Publication number	US-9590188-B2
Application number	US-201313967997-A
Country	US
Kind code	B2
Filing date	Aug 15, 2013
Priority date	Dec 13, 2006
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

Disclosed is an organic electroluminescent device having long life, while exhibiting high luminous efficiency. Also disclosed are an illuminating device and a display, each using such an organic electroluminescent device. In the organic electroluminescent device, a compound represented by the general formula (A) which is suitable as a host material for a phosphorescent metal complex is used at least in one sublayer of a light-emitting layer.

First claim

The invention claimed is:

1. An organic electroluminescent element comprising a substrate having thereon at least an anode and a cathode, and a light emitting layer between the aforesaid anode and the aforesaid cathode, wherein at least one light emitting layer incorporates a compound represented by Formula (A):

wherein A1 and A2 each represents a hydrogen atom or a substituent, provided that at least one of A1 and A2 is a substituent, the substituent being a nitrogen atom-containing aromatic heterocyclic group, and the nitrogen atom-containing aromatic heterocyclic group being bonded to L1 or L2 through a nitrogen atom; X and Y each represents N—R (where R represents a hydrogen atom or a substituent); L1 and L2, each represents a divalent linking group, and L3 represents an arylene group; n represents an integer of 1 or 2; n1 and n2 each represents an integer 1 or 2; and n3 and n4 each represents an integer of 0 or 1, provided that the following condition is satisfied, n1+n2≧2.

2. The organic electroluminescent element of claim 1 , wherein the aforesaid nitrogen atom-containing substituent is a carbazolyl group.

3. The organic electroluminescent element of claim 1 , wherein the aforesaid nitrogen atom-containing substituent represents a carbolinyl group and the aforesaid carbolinyl group is the substituent which is derived from the carboline derivative represented by Formula (a):

wherein X 1 -X 8 each represents a nitrogen atom or —C(Ra)═; at least one of the aforesaid X 1 -X 8 represents a nitrogen atom; and Ra and Rb each represents a hydrogen atom or a substituent.

4. The organic electroluminescent element of claim 1 , wherein the aforesaid nitrogen atom-containing substituent is a diarylamino group.

5. The organic electroluminescent element of claim 1 , wherein the aforesaid light emitting layer incorporates a phosphorescence emitting metal complex.

6. The organic electroluminescent element of claim 5 , wherein the aforesaid phosphorescence emitting metal complex is an Ir complex.

7. The organic electroluminescent element of claim 5 , wherein the aforesaid phosphorescence emitting metal complex is represented by Formula (B):

wherein R 1 represents a substituent; Z represents a group of atoms necessary for forming a 5-7 membered ring; n 1 represents an integer of 0-5; B 1 -B 5 each represents a carbon atom, a nitrogen atom, an oxygen atom, or a sulfur atom and at least one represents a nitrogen atom; M 1 represents a metal of Groups 8-10 in the element periodic table; X 1 and X 2 each represents a carbon atom, a nitrogen atom, or an oxygen atom; L 1 represents a group of atoms which form a bidentate ligand with X 1 and X 2 ; m1 represents 1, 2, or 3; and m2 represents 0, 1, or 2, provided that a sum of m1 and m2 is 2 or 3.

8. The organic electroluminescent element of claim 1 , wherein m2 of the phosphorescence emitting metal complex represented by the aforesaid Formula (B) is 0.

9. The organic electroluminescent element of claim 7 , wherein a nitrogen-containing heterocyclic ring formed by phosphorescence emitting metal complexes B1-B5 represented by the aforesaid Formula (B) is an imidazole ring.

10. The organic electroluminescent element of claim 1 , emitting white light.

11. A display device provided with the organic electroluminescent element of claim 1 .

12. An illuminating device provided with the organic electroluminescent element of claim 1 .

Assignees

• Konica Minolta Inc

Inventors

• Otsu Shinya
• Katoh Eisaku
• Tanaka Tatsuo

Classifications

• C09K2211/1092

  containing sulfur as the only heteroatom · CPC title

• H01L51/0073

  Electricity · mapped topic

• C09K2211/1059

  containing three nitrogen atoms as heteroatoms · CPC title

• C09K11/06

  containing organic luminescent materials · CPC title

• H05B33/20

  characterised by the chemical or physical composition or the arrangement of the material in which the electroluminescent material is embedded · CPC title