Organic electroluminescent element, display device and lighting device

Patent metadata

Field	Value
Publication number	US-10109800-B2
Application number	US-201615340520-A
Country	US
Kind code	B2
Filing date	Nov 1, 2016
Priority date	Dec 13, 2006
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

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, provided that at least one of A1 and A2 represents one selected from the group consisting of a carbazolyl group, a carbolinyl group; represented by Formula (a), and a diarylamino group; X and Y each represents O; L1 and L2 each represent a divalent linking group; and L3 represents a divalent linking group selected from the group consisting of carboline ring, a diazacarbazole ring, a triazole ring, a pyrrole ring, a pyridine ring, a pyrazine ring, a quinoxaline ring, a triophene ring, an oxadiazole ring, and an indole ring; 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)═; at least one of the aforesaid X 1 -X 8 represents —C(Ra)═, wherein Ra is a hydrogen atom; and Ra and Rb each represent a hydrogen atom or a substituent.

2. The organic electroluminescent element of claim 1 , wherein the at least one of A1 and A2 represents a carbazolyl group or a diarylamino group.

3. The organic electroluminescent element of claim 1 ,
wherein L3 represents a divalent linking group selected from the group consisting of a pyridine ring and an oxadiazole ring.

4. The organic electroluminescent element of claim 1 , wherein L3 represents a divalent linking group derived from a pyridine ring.

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

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

7. The organic electroluminescent element of claim 4 , 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 numbered ring; n 1 represents an integer of 0 -5; B 1 - B5 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 6 , 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 B 1 -B 5 in 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

• H01L51/0073

  Electricity · mapped topic

• H01L51/5016

  Electricity · mapped topic

• C09K2211/1033

  with oxygen · CPC title

• H05B33/14

  characterised by the chemical or physical composition or the arrangement of the electroluminescent material {, or by the simultaneous addition of the electroluminescent material in or onto the light source} · CPC title

• C07D471/04

  Ortho-condensed systems · CPC title