Organic electroluminescent element, display device and lighting device

Patent metadata

Field	Value
Publication number	US-9627630-B2
Application number	US-201514595611-A
Country	US
Kind code	B2
Filing date	Jan 13, 2015
Priority date	Dec 13, 2006
Publication date	Apr 18, 2017
Grant date	Apr 18, 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 represent a hydrogen atom or a nitrogen-atom containing substituent selected from the group consisting of a carbazolyl group, a carbolinyl group represented by Formula (a), and a diarylamino group, provided that at least one of A1 and A2 represents the carbazolyl group; X and Y each represent O; L1 and L2 each represent a divalent linking group; L3 represents a m-phenylene group; n represents an integer of 1 or 2; n1 and n2 each represent an integer of 1 or 2; and n3 and n4 each represent 0 or 1;

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

2. The organic electroluminescent element of claim 1 , wherein both A1 and A2 in Formula (A) represent the carbazolyl group.

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

4. The organic electroluminescent element of claim 3 , wherein the aforesaid phosphorescence emitting metal complex is an Ir complex.

5. The organic electroluminescent element of claim 3 , wherein the aforesaid phosphorescence emitting metal complex is represented by Formula (B):

wherein R 1 represents a substituent; Z represents a group of non-metal 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.

6. The organic electroluminescent element of claim 5 , wherein m2 of the phosphorescence emitting metal complex represented by the aforesaid Formula (B) is 0.

7. The organic electroluminescent element of claim 5 , wherein a nitrogen-containing heterocyclic ring formed by phosphorescence emitting metal complexes B 1 -B 5 in the aforesaid Formula (B) is an imidazole ring.

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

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

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

Assignees

• Konica Minolta Inc

Inventors

• Otsu Shinya
• Katoh Eisaku
• Tanaka Tatsuo

Classifications

• C09K11/06

  containing organic luminescent materials · CPC title

• C09K2211/1037

  with sulfur · CPC title

• C09K2211/1088

  containing oxygen as the only heteroatom · CPC title

• C07D471/04

  Ortho-condensed systems · CPC title

• C07D405/14 Primary

  containing three or more hetero rings · CPC title