The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 25, 2011
Filed:
Jul. 20, 2007
Tomokazu Kobata, Kobe, JP;
Nobutaka Akashi, Kobe, JP;
Tomokazu Kobata, Kobe, JP;
Nobutaka Akashi, Kobe, JP;
Bando Chemical Industries, Ltd., Hyogo, JP;
Abstract
The invention provides an organic electroluminescence element which comprises a hole transporting layer which comprises a tris(p-terphenyl-4-yl)amine represented by the general formula (I) wherein R, Rand Rare each independently a hydrogen atom, an alkyl group, a cycloalkyl group which may have substituents or an aryl group which may have substituents as a hole transporting agent, and a hole injecting layer which comprises a hole injecting agent comprising an aromatic tertiary amine having an ionization potential in the range of 5.2-5.6 eV. This organic electroluminescence element can be driven at a low voltage with high efficiency and at high luminance.