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:
Aug. 20, 2002
Filed:
Mar. 24, 2000
Idemitsu Kosan Co., Ltd., Tokyo, JP;
Abstract
The present invention is to provide an organic EL element which can secure the durability by which to endure the pulse driving and which has an excellent heat resistance. In an organic electroluminescence element in which a luminous layer and a hole injection layer are formed between an anode and a cathode, the hole injection layer is formed using an oligomer having a phenylenediamine structure and having a glass transition temperature of 110° C. or more, and an intermediate layer is formed between the hole injection layer and the anode to inhibit a chemical reaction in an interface between the anode and the hole injection layer. Consequently, it is possible to remarkably improve the heat resistance of the element, to secure the excellent durability capable of enduring severe driving conditions, and to realize the prolongation of life of the element.