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:
May. 20, 2014
Filed:
Apr. 22, 2010
Yoshimasa Fujita, Osaka, JP;
Yoshimasa Fujita, Osaka, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
An organic electroluminescent element comprising: an anode (); a cathode (); and an organic layer (), sandwiched between the anode () and the cathode (), which contains a positive and negative charge transporting material, the organic layer () including an acceptor region () doped with an acceptor, a donor region () doped with a donor, and a light-emitting region () doped with an organic light-emitting material, the acceptor region () being located on the anode (), the donor region () being located on the cathode (), the light-emitting region () being located between the acceptor region () and the donor region (), the acceptor having such a concentration gradient in the acceptor region () as to become lower in concentration from the anode () toward the light-emitting region (), the donor having such a concentration gradient in the donor region () as to become lower in concentration from the cathode () toward the light-emitting region (). This makes it possible to provide a simple-structured, high-luminance, high-efficiency, and long-life organic EL element.