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:
Jan. 21, 2003
Filed:
Mar. 31, 1999
Hiroaki Nakamura, Sodegaura, JP;
Chishio Hosokawa, Sodegaura, JP;
Kenichi Fukuoka, Sodegaura, JP;
Hiroshi Tokailin, Sodegaura, JP;
Idemitsu Kosan Co., Ltd., Tokyo, JP;
Abstract
An organic EL device is improved to produce an increased luminance and have a prolonged lifetime. In an organic EL device comprising a cathode layer an electron injection region a light emission region and an anode layer as laminated in that order, the electron injection region contains an aromatic compound composed of carbon and hydrogen or an aromatic compound composed of carbon, hydrogen and oxygen, along with a reducing dopant, and the electron affinity of the electron injection region is controlled to fall between 1.8 and 3.6 eV; or the electron injection region contains an electron-transporting compound and a reducing dopant having a work function of at most 2.9 eV, and the electron affinity of the electron injection region is controlled to fall between 1.8 and 3.6 eV.