Phenanthrene Compound, Light-Emitting Element, Light-Emitting Device, Electronic Device, and Lighting Device

• US 20120104369A1
• Filed: 10/27/2011
• Published: 05/03/2012
• Est. Priority Date: 10/29/2010
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Kawata, Yuko, Kadoma, Hiroshi, Ohsawa, Nobuharu, Seo, Satoshi
• Granted Patent: US 8,968,888 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: C07D 333/76 Dibenzothiophenes
• CPC Class Codes: H10K 2101/10 Triplet emission
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/166 comprising a multilayered structure
• CPC Class Codes: H10K 85/342 comprising iridium
• CPC Class Codes: H10K 85/615 Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
• CPC Class Codes: H10K 85/633 comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom
• CPC Class Codes: H10K 85/6576 comprising only sulfur in the heteroaromatic polycondensed ring system, e.g. benzothiophene

Abstract

A novel compound having high triplet excitation energy and a bipolar property is provided. Specifically, a phenanthrene compound represented by General Formula (G1) is provided where R¹¹ to R¹⁹ and R²¹ to R²⁷ separately represent any one of hydrogen, an alkyl group having 1 to 4 carbon atoms, and a substituted or unsubstituted aryl group having 6 to 13 carbon atoms, Ar represents a substituted or unsubstituted arylene group having 6 to 13 carbon atoms, and Z represents a sulfur atom or an oxygen atom. The use of the phenanthrene compound as a host material of a light-emitting layer in the presence of a phosphorescent dopant allows the formation of a light-emitting element with high current efficiency.

Claims

1. A phenanthrene compound represented by General Formula (G1):

2. The phenanthrene compound according to claim 1, wherein Ar represents a substituted or unsubstituted phenylene group or a substituted or unsubstituted biphenyldiyl group.

3. The phenanthrene compound according to claim 1, wherein Ar represents a substituted or unsubstituted phenylene group.

4. The phenanthrene compound according to claim 1, wherein R¹¹ to R¹⁹ and R²¹ to R²⁷ each represent hydrogen.

5. The phenanthrene compound according to claim 1,

wherein the phenanthrene compound is represented by General Formula (G2):

6. The phenanthrene compound according to claim 5, wherein the phenylene group in the General Formula (G2) is para-substituted.

7. The phenanthrene compound according to claim 5, wherein the phenylene group in the General Formula (G2) is meta-substituted.

8. A light-emitting element comprising the phenanthrene compound according to claim 1.

9. The light-emitting element according to claim 8, further comprising:

a pair of electrodes; and

a light-emitting layer between the pair of electrodes,

wherein the phenanthrene compound is included in the light-emitting layer.

10. The light-emitting element according to claim 9, wherein the light-emitting layer further comprises a phosphorescent material.

11. The light-emitting element according to claim 9,

wherein the light-emitting layer comprises a first light-emitting layer and a second light-emitting layer over the first light-emitting layer,

wherein the first light-emitting layer and the second light-emitting layer each comprise the phenanthrene compound and a phosphorescent material, and

wherein the first light-emitting layer is different in concentration of the phosphorescent material from the second light-emitting layer.

12. A display device comprising the light-emitting element according to claim 8.

13. An electronic device comprising the light-emitting element according to claim 8.

14. A lighting device comprising the light-emitting element according to claim 8.

15. The lighting device according to claim 14, wherein the lighting device is capable of emitting white light.