COMPOSITE MATERIAL, LIGHT-EMITTING ELEMENT, LIGHT-EMITTING DEVICE, ELECTRONIC DEVICE, AND LIGHTING DEVICE

• US 20120080667A1
• Filed: 09/23/2011
• Published: 04/05/2012
• Est. Priority Date: 10/04/2010
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Nowatari, Hiromi, Seo, Satoshi, Osaka, Harue, Takasu, Takako
• Granted Patent: US 9,496,505 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• 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 2211/1088 containing oxygen as the only heteroatom
• CPC Class Codes: C09K 2211/1092 containing sulfur as the only heteroatom
• CPC Class Codes: 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
• CPC Class Codes: H10K 2102/00 Constructional details relating to the organic devices covered by this subclass
• CPC Class Codes: H10K 50/00 Organic light-emitting devices integrated devices or assemblies of multiple devices H10K59/00, H10K65/00; organic semiconductor lasers H01S5/36
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/14 Carrier transporting layers
• CPC Class Codes: H10K 85/615 Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
• CPC Class Codes: H10K 85/6572 comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
• CPC Class Codes: H10K 85/6574 comprising only oxygen in the heteroaromatic polycondensed ring system, e.g. cumarine dyes
• CPC Class Codes: H10K 85/6576 comprising only sulfur in the heteroaromatic polycondensed ring system, e.g. benzothiophene

Abstract

A composite material including an organic compound and an inorganic compound and having a high carrier-transport property is provided. A composite material having a high carrier-injection property to an organic compound is provided. A composite material in which light absorption due to charge transfer interaction is unlikely to occur is provided. A light-emitting element having high emission efficiency is provided by including the composite material. A light-emitting element having a low drive voltage is provided. A light-emitting element having a long lifetime is provided. A composite material including a heterocyclic compound having a dibenzothiophene skeleton or a dibenzofuran skeleton and an inorganic compound exhibiting an electron-accepting property with respect to the heterocyclic compound is provided.

Claims

1. A composite material comprising:

a heterocyclic compound comprising one of a dibenzothiophene skeleton and a dibenzofuran skeleton; and

an inorganic compound exhibiting an electron-accepting property with respect to the heterocyclic compound.

16. The composite material according to claim 1 or 6, wherein a highest occupied molecular orbital level of the heterocyclic compound measured by photoelectron spectrometry is lower than or equal to −

5.7 eV.

17. A light-emitting element comprising:

a layer including a light-emitting substance between a pair of electrodes,

wherein the layer including the light-emitting substance comprises a layer including the composite material according to any one of claims 1, 4, 5, 6, 13 and 14.

18. A light-emitting element comprising:

a layer including the composite material according to any one of claims 1, 4, 5, 6, 13 and 14,

wherein the layer is interposed between a pair of electrodes and in contact with one of the pair of electrodes.

19. A light-emitting element comprising:

a plurality of layers including a light-emitting substance between a pair of electrodes; and

a layer including the composite material according to any one of claims 1 to 8, 13 and 14,

wherein the layer including the composite material is interposed between the plurality of layers including the light-emitting substance.

20. The composite material according to any one of claims 1 to 5, wherein the heterocyclic compound and the inorganic compound are mixed.

22. A light-emitting device comprising a layer that includes the composite material according to any one of claims 1, 4, 5, 6, 13 and 14, wherein the layer is provided in a display portion.

23. A lighting device comprising a layer that includes the composite material according to any one of claims 1 to 8, 13, and 14, wherein the layer is provided in a light-emitting portion.

2. A composite material comprising:

a heterocyclic compound comprising a substituent bonded to a 4-position of one of a dibenzothiophene skeleton and a dibenzofuran skeleton, the substituent comprising 6 to 70 carbon atoms; and

an inorganic compound exhibiting an electron-accepting property with respect to the heterocyclic compound.

9. The composite material according to claim 2 or 7,

wherein the heterocyclic compound comprises one substituent, and

wherein a ring of the substituent is one or a plurality of rings selected from a benzene ring, a naphthalene ring, a phenanthrene ring, a triphenylene ring, a fluorene ring, a dibenzothiophene ring, and a dibenzofuran ring.

10. The composite material according to claim 2 or 7,

wherein the heterocyclic compound comprises a plurality of substituents, and

wherein each ring of the substituents is separately one or a plurality of rings selected from a benzene ring, a naphthalene ring, a phenanthrene ring, a triphenylene ring, a fluorene ring, a dibenzothiophene ring, and a dibenzofuran ring.

3. A composite material comprising:

a heterocyclic compound comprising a phenyl group bonded to a 4-position of one of a dibenzothiophene skeleton and a dibenzofuran skeleton, the phenyl group comprising one or more substituents, the phenyl group and the one or more substituents comprising a total of 12 to 70 carbon atoms; and

an inorganic compound exhibiting an electron-accepting property with respect to the heterocyclic compound.

11. The composite material according to claim 3 or 8,

wherein the phenyl group comprises one substituent, and

wherein a ring of the substituent is one or a plurality of rings selected from a benzene ring, a naphthalene ring, a phenanthrene ring, a triphenylene ring, a fluorene ring, a dibenzothiophene ring, and a dibenzofuran ring.

12. The composite material according to claim 3 or 8,

wherein the phenyl group comprises a plurality of substituents, and

wherein each ring of the substituents is separately one or a plurality of rings selected from a benzene ring, a naphthalene ring, a phenanthrene ring, a triphenylene ring, a fluorene ring, a dibenzothiophene ring, and a dibenzofuran ring.

4. A composite material comprising:

a heterocyclic compound represented by a general formula (G1);

5. A composite material comprising:

a heterocyclic compound represented by a general formula (G1);

6. A composite material comprising:

a heterocyclic compound comprising one of a dibenzothiophene skeleton and a dibenzofuran skeleton; and

a transition metal oxide.

7. A composite material comprising:

a heterocyclic compound comprising a substituent bonded to a 4-position of one of a dibenzothiophene skeleton and a dibenzofuran skeleton, the substituent comprising 6 to 70 carbon atoms; and

a transition metal oxide.

8. A composite material comprising:

a heterocyclic compound comprising a phenyl group bonded to a 4-position of one of a dibenzothiophene skeleton and a dibenzofuran skeleton, the phenyl group comprising one or more substituents, the phenyl group and the one or more substituents comprising a total of 12 to 70 carbon atoms; and

a transition metal oxide.

13. A composite material comprising:

a heterocyclic compound represented by a general formula (G1);

15. The composite material according to any one of claims 6, 7, 8, 13 and 14, wherein the transition metal oxide is one or a plurality of oxides selected from titanium oxide, vanadium oxide, tantalum oxide, molybdenum oxide, tungsten oxide, rhenium oxide, ruthenium oxide, chromium oxide, zirconium oxide, hafnium oxide, and silver oxide.

21. The composite material according to any one of claims 6, 7, 8, 13 and 14, wherein the heterocyclic compound and the transition metal oxide are mixed.

14. A composite material comprising:

a heterocyclic compound represented by a general formula (G1);