# US 8,541,112 B2 · Organic electroluminescent element, display device and lighting device

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- Number: US 8,541,112 B2
- Document ID: US8541112B2
- Status: Granted
- Kind: B2
- Application number: 12/443,410
- Filed: 2007-12-10
- Published: 2010-04-08
- Granted: 2013-09-24
- Earliest claimed: 2006-12-13
- Assignees: Konica Minolta Holdings, Inc.
- Applicants: Shinya Otsu; Eisaku Katoh; Tatsuo Tanaka
- Inventors: Shinya Otsu; Eisaku Katoh; Tatsuo Tanaka
- Web page: https://patentgrep.com/patent/US8541112B2

## CPC

- H10K 85/6572: {comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole}
- C07D 405/14: containing three or more hetero rings
- C07D 409/14: containing three or more hetero rings
- C07D 413/14: containing three or more hetero rings
- C07D 471/04: Ortho-condensed systems
- C09K 11/025: {non-luminescent particle coatings or suspension media}
- C09K 11/06: containing organic luminescent materials
- H05B 33/14: 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}
- H05B 33/20: characterised by the chemical or physical composition or the arrangement of the material in which the electroluminescent material is embedded
- H10K 85/324: {comprising aluminium, e.g. Alq3}
- H10K 85/342: {comprising iridium}
- H10K 85/633: {comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom}
- H10K 85/654: {comprising only nitrogen as heteroatom (H10K85/652 takes precedence)}
- H10K 85/657: {Polycyclic condensed heteroaromatic hydrocarbons}
- H10K 85/6574: {comprising only oxygen in the heteroaromatic polycondensed ring system, e.g. cumarine dyes}
- H10K 85/6576: {comprising only sulfur in the heteroaromatic polycondensed ring system, e.g. benzothiophene}
- C09K 2211/1007: Non-condensed systems
- C09K 2211/1029: containing one nitrogen atom as the heteroatom
- C09K 2211/1033: with oxygen
- C09K 2211/1037: with sulfur
- C09K 2211/1044: containing two nitrogen atoms as heteroatoms
- C09K 2211/1059: containing three nitrogen atoms as heteroatoms
- C09K 2211/1074: containing more than three nitrogen atoms as heteroatoms
- C09K 2211/1088: containing oxygen as the only heteroatom
- C09K 2211/1092: containing sulfur as the only heteroatom
- C09K 2211/185: of the platinum group, i.e. Os, Ir, Pt, Ru, Rh or Pd
- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K 2101/10: Triplet emission
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## 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.

## Claims

### Claim 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 represents a nitrogen atom containing substituent; X and Y each represents O, S, Se, Te, or N—R (where R represents a hydrogen atom or a substituent), providing that X is different from Y; L1, L2, and L3 each represents a divalent linking group; provided that L3 is bonded at a 2 or 3 position of a phenyl ring, n represents an integer of 1 or 2; n1 and n2 each represents an integer of 1 or 2; and n3 and n4 each represents 0 or 1.

### Claim 2 (depends on 1)

The organic electroluminescent element of claim 1, wherein the aforesaid L3 represents an arylene group, a heteroarylene group, a divalent heterocyclic group or an alkylene group.

### Claim 3 (depends on 1)

The organic electroluminescent element of claim 1, wherein the aforesaid L3 represents an arylene group.

### Claim 4 (depends on 1)

The organic electroluminescent element of claim 1, wherein the aforesaid L3 represents a m-phenylene group.

### Claim 5 (depends on 1)

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

### Claim 6 (depends on 1)

The organic electroluminescent element of claim 1, wherein the aforesaid nitrogen atom-containing substituent represents a carbolynyl group and the aforesaid carbolynyl group is the substituent which is derived from the carboline derivative represented by Formula (a):
wherein X1-X8 each represents a nitrogen atom or —C(Ra)═; at least one of the aforesaid X1-X8 represents a nitrogen atom; and Ra and Rb each represents a hydrogen atom or a substituent.

### Claim 7 (depends on 1)

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

### Claim 8 (depends on 1)

The organic electroluminescent element of claim 1, wherein the aforesaid X is an oxygen atom.

### Claim 9 (depends on 1)

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

### Claim 10 (depends on 1)

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

### Claim 11 (depends on 1)

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

### Claim 12 (depends on 1)

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

### Claim 13 (depends on 12)

The organic electroluminescent element of claim 12, wherein the aforesaid phosphorescence emitting metal complex is an Ir complex.

### Claim 14 (depends on 12)

The organic electroluminescent element of claim 12, wherein the aforesaid phosphorescence emitting metal complex is represented by Formula (B):
wherein R1 represents a substituent; Z represents a group of non-metal atoms necessary for forming a 5-7 membered ring; n1 represents an integer of 0-5; B1-B5 each represents a carbon atom, a nitrogen atom, an oxygen atom, or a sulfur atom and at least one represents a nitrogen atom; M1 represents a metal of Groups 8-10 in the element periodic table; X1 and X2 each represents a carbon atom, a nitrogen atom, or an oxygen atom; L1 represents a group of atoms which form a bidentate ligand with X1 and X2; 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.

### Claim 15 (depends on 14)

The organic electroluminescent element of claim 14, wherein m2 of the phosphorescence emitting metal complex represented by the aforesaid Formula (B) is 0.

### Claim 16 (depends on 14)

The organic electroluminescent element of claim 14, wherein a nitrogen-containing heterocyclic ring formed by phosphorescence emitting metal complexes B1-B5 in the aforesaid Formula (B) is an imidazole ring.