Composite Material, Light Emitting Element and Light Emitting Device

• US 20080191611A1
• Filed: 03/13/2006
• Published: 08/14/2008
• Est. Priority Date: 03/23/2005
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Seo, Satoshi, Kumaki, Daisuke, Iwaki, Yuji
• Granted Patent: US 8,420,227 B2
• Time in Patent Office: Days
• US Class Current: 313/504
• CPC Class Codes: H10K 2101/40 Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers
• CPC Class Codes: H10K 2102/00 Constructional details relating to the organic devices covered by this subclass
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/157 between the light-emitting layer and the cathode
• CPC Class Codes: H10K 50/17 Carrier injection layers
• CPC Class Codes: H10K 50/19 Tandem OLEDs
• CPC Class Codes: H10K 85/00 Organic materials used in the body or electrodes of devices covered by this subclass
• CPC Class Codes: H10K 85/611 Charge transfer complexes
• CPC Class Codes: H10K 85/615 Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
• CPC Class Codes: H10K 85/626 containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene
• CPC Class Codes: H10K 85/6572 comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

An object of the present invention is to provide a composite material formed of an organic compound and an inorganic compound, and has an excellent carrier transporting property, an excellent carrier injecting property to the organic compound, as well as excellent transparency. A composite material of the present invention for achieving the above object is a composite material of an organic compound represented in the general formula below, and an inorganic compound. For the inorganic compound, an oxide of a transition metal, preferably an oxide of a metal belonging to groups 4 to 8 of the periodic table, in particular vanadium oxide, tantalum oxide, molybdenum oxide, tungsten oxide, rhenium oxide, and ruthenium oxide, can be used.

Claims

1. A composite material comprising an organic compound represented in the general formula (1), and an inorganic compound;

wherein Ar represents an aromatic series hydrocarbon group having 6 to 42 carbon atoms;

n represents a natural number from 1 to 3; and

R¹ and R² represent hydrogen, an alkyl group having 1 to 4 carbon atoms, or an aryl group having 6 to 12 carbon atoms.

10. A composite material according to any one of claims 1 to 4, 8 and 9, wherein the inorganic compound is an oxide of a transition metal.

11. A composite material according to any one of claims 1 to 4, 8 and 9, wherein the inorganic compound is an oxide of a metal belonging to groups 4 to 8 of the periodic table.

12. A composite material according to any one of claims 1 to 4, 8 and 9, wherein the inorganic compound is any of vanadium oxide, tantalum oxide, molybdenum oxide, tungsten oxide, rhenium oxide, and ruthenium oxide.

2. A composite material comprising an organic compound represented in the general formula (2), and an inorganic compound,

wherein Ar represents a monovalent aromatic series hydrocarbon group having 6 to 42 carbon atoms;

and R¹ and R² represent hydrogen, an alkyl group having 1 to 4 carbon atoms, or an aryl group having 6 to 12 carbon atoms.

5. A composite material according to claim 2, wherein Ar represents any of the aromatic series hydrocarbon groups represented in the structural formulas (2-1) to (2-3),

3. A composite material comprising an organic compound represented in the general formula (3), and an inorganic compound,

wherein Ar represents a divalent aromatic series hydrocarbon group having 6 to 42 carbon atoms;

and R¹ to R⁴ represent hydrogen, an alkyl group having 1 to 4 carbon atoms, or an aryl group having 6 to 12 carbon atoms.

6. A composite material according to claim 3, wherein Ar represents any of the aromatic series hydrocarbon groups represented in the structural formulas (3-1) to (3-10),

4. A composite material comprising an organic compound represented in the general formula (4), and an inorganic compound,

wherein Ar represents a trivalent aromatic series hydrocarbon group having 6 to 42 carbon atoms;

and R¹ to R⁶ represent hydrogen, or an alkyl group having 1 to 4 carbon atoms, or an aryl group having 6 to 12 carbon atoms.

7. A composite material according to claim 4, wherein Ar represents any of the aromatic series hydrocarbon groups represented in the structural formulas (4-1) to (4-3),

8. A composite material comprising an aryl carbazole and an inorganic compound.

9. A composite material comprising an aryl carbazole which does not have an arylamine skeleton, and an inorganic compound.

13. A light emitting element comprising between a first electrode and a second electrode:

a layer including an organic compound represented in the general formula (1) and an inorganic compound; and

a layer including a light emitting substance,

wherein Ar represents an aromatic series hydrocarbon group having 6 to 42 carbon atoms;

n represents a natural number from 1 to 3; and

R¹ and R² represent hydrogen, an alkyl group having 1 to 4 carbon atoms, or an aryl group having 6 to 12 carbon atoms.

22. A light emitting element according to any one of claims 13 to 16, 20 and 21, wherein the inorganic compound is an oxide of a transition metal.

23. A light emitting element according to any one of claims 13 to 16, 20 and 21, wherein the inorganic compound is an oxide of a metal belonging to groups 4 to 8 of the periodic table.

24. A light emitting element according to any one of claims 13 to 16, 20 and 21, wherein the inorganic compound is any of vanadium oxide, tantalum oxide, molybdenum oxide, tungsten oxide, rhenium oxide, and ruthenium oxide.

25. A light emitting device comprising:

the light emitting element according to any one of claims 13 to 16, 20 and 21; and

a means for controlling light emission of the light emitting element.

26. An electronic appliance comprising:

a display portion, the display portion which includes the light emitting element according to any one of claims 13 to 16, 20 and 21; and

a means for controlling light emission of the light emitting element.

14. A light emitting element comprising between a first electrode and a second electrode:

a layer including an organic compound represented in the general formula (2), and an inorganic compound; and

a layer including a light emitting substance,

wherein Ar represents a monovalent aromatic series hydrocarbon group having 6 to 42 carbon atoms; and

R¹ and R² represent hydrogen, an alkyl group having 1 to 4 carbon atoms, or an aryl group having 6 to 12 carbon atoms.

17. A light emitting element according to claim 14, wherein Ar represents one of the aromatic series hydrocarbon groups represented in the structural formulas (2-1) to (2-3),

15. A light emitting element comprising between a first electrode and a second electrode:

a layer including an organic compound represented in the general formula (3), and an inorganic compound; and

a layer including a light emitting substance,

wherein Ar represents a divalent aromatic series hydrocarbon group having 6 to 42 carbon atoms; and

R¹ to R⁴ represent hydrogen, an alkyl group having 1 to 4 carbon atoms, or an aryl group having 6 to 12 carbon atoms.

18. A light emitting element according to claim 15, wherein Ar represents one of the aromatic series hydrocarbon groups represented in the structural formulas (3-1) to (3-10),

16. A light emitting element comprising between a first electrode and a second electrode:

a layer including an organic compound represented in the general formula (4), and an inorganic compound; and

a layer including a light emitting substance,

wherein Ar represents a trivalent aromatic series hydrocarbon group having 6 to 42 carbon atoms; and

R¹ to R⁶ represent hydrogen, an alkyl group having 1 to 4 carbon atoms, or an aryl group having 6 to 12 carbon atoms.

19. A light emitting element according to claim 16, wherein Ar represents one of the aromatic series hydrocarbon groups represented in the structural formulas (4-1) to (4-3),

20. A light emitting element comprising between a first electrode and a second electrode:

a layer including an aryl carbazole and an inorganic compound; and

a layer including a light emitting substance.

21. A light emitting element comprising between a first electrode and a second electrode:

a layer including an aryl carbazole which does not have an arylamine skeleton, and an inorganic compound; and

a layer including a light emitting substance.