ORGANIC ELECTROLUMINESCENT ELEMENT AND MATERIAL FOR ORGANIC ELECTROLUMINESCENT ELEMENTS

• US 20150060801A1
• Filed: 03/29/2013
• Published: 03/05/2015
• Est. Priority Date: 03/29/2012
• Status: Active Grant

• Current Assignee: Idemitsu Kosan Company Limited
• Original Assignee: Idemitsu Kosan Company Limited
• Inventors: Nishimura, Kazuki, Ogiwara, Toshinari, Hibino, Kumiko, Inoue, Tetsuya, Ito, Mitsunori
• Granted Patent: US 9,711,732 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: C07D 403/14 containing three or more hetero rings
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 2211/1007 Non-condensed systems
• CPC Class Codes: C09K 2211/1011 Condensed systems
• CPC Class Codes: C09K 2211/1029 containing one nitrogen atom as the heteroatom
• CPC Class Codes: C09K 2211/1044 containing two nitrogen atoms as heteroatoms
• CPC Class Codes: C09K 2211/1059 containing three nitrogen atoms as heteroatoms
• CPC Class Codes: H05B 33/10 Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
• CPC Class Codes: H10K 2101/10 Triplet emission
• CPC Class Codes: H10K 2101/90 Multiple hosts in the emissive layer
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 85/342 comprising iridium
• CPC Class Codes: H10K 85/654 comprising only nitrogen as heteroatom H10K85/652 takes precedence
• CPC Class Codes: H10K 85/6572 comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole

Abstract

An organic electroluminescence device includes: a cathode; an anode; and an organic thin-film layer having one or more layers and provided between the anode and the cathode, in which the organic layer includes an emitting layer. The emitting layer includes a first host material, a second host material and a phosphorescent dopant material. The first host material is a compound represented by a formula (1A). The second host material is a compound represented by a formula (2A).

Claims

1. An organic electroluminescence device comprising:

a cathode;

an anode; and

an organic thin-film layer disposed between the cathode and the anode, the organic thin-film layer having one or more layers comprising an emitting layer,

the emitting layer comprising;

a first host material;

a second host material; and

a phosphorescent dopant material, wherein

the first host material is a compound represented by a formula (1A), and

the second host material is represented by a formula (2A),

2. The organic electroluminescence device according to claim 1, wherein

L₂ is a single bond.

3. The organic electroluminescence device according to claim 1, wherein

L₃ is a single bond.

4. The organic electroluminescence device according to claim 1, wherein

L₂ is a substituted or unsubstituted arylene group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 30 ring atoms.

5. The organic electroluminescence device according to claim 1, wherein

L₃ is a substituted or unsubstituted arylene group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 30 ring atoms.

6. The organic electroluminescence device according to claim 1, wherein

when Y₆ is directly bonded to Y₁₄ in (1A) and Z₇ is bonded to Z₁₄ through L₃ in (2A), L₃ is a substituted or unsubstituted arylene group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 30 ring atoms.

7. The organic electroluminescence device according to claim 1, wherein

the first host material is a compound represented by a formula (1), and

the second host material is represented by a formula (2),

8. The organic electroluminescence device according to claim 7, wherein

in the formula (1), Y₇ is bonded to Y₁₄ or Y₆ is bonded to Y₁₅.

9. The organic electroluminescence device according to claim 7, wherein

in the formula (2), Z₇ is bonded to Z₁₄ or Z₆ is bonded to Z₁₅.

10. The organic electroluminescence device according to claim 1, wherein

two or more of X₁ to X₃ are nitrogen atoms;

and

two or more of X₄ to X₆ are nitrogen atoms.

11. The organic electroluminescence device according to claim 1, wherein

the number of nitrogen atoms of X₁ to X₃ is different from the number of nitrogen atoms of X₄ to X₆.

12. The organic electroluminescence device according to claim 1, wherein

L₁ is a substituted or unsubstituted phenylene group, substituted or unsubstituted naphthylene group, substituted or unsubstituted fluorenylene group, substituted or unsubstituted phenanthrenediyl group, or substituted or unsubstituted triphenylenediyl group.

13. A material for an organic electroluminescence device, comprising a compound represented by a formula (1A) and a compound represented by a formula (2A),

14. The material for the organic electroluminescence device according to claim 13, wherein L₂ is a single bond, and

L₃ is a single bond.

15. The material for the organic electroluminescence device according to claim 13, wherein

formula (1A) is represented by a formula (1) and formula (2A) is represented by a formula (2),

16. The material for the organic electroluminescence device according to claim 13, wherein

two or more of X₁ to X₃ are nitrogen atoms;

and

two or more of X₄ to X₆ are nitrogen atoms.

17. The material for the organic electroluminescence device according to claim 13, wherein

the number of nitrogen atoms of X₁ to X₃ is different from the number of nitrogen atoms of X₄ to X₆.

18. The material for the organic electroluminescence device according to claim 13, wherein

L₁ is a substituted or unsubstituted phenylene group, substituted or unsubstituted naphthylene group, substituted or unsubstituted fluorenylene group, substituted or unsubstituted phenanthrenediyl group, or substituted or unsubstituted triphenylenediyl group.