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:
Nov. 11, 2014
Filed:
Jan. 21, 2011
Satoru Ohuchi, Osaka, JP;
Ryuuta Yamada, Kyoto, JP;
Takahiro Komatsu, Osaka, JP;
Shinya Fujimura, Osaka, JP;
Hirofumi Fujita, Ehime, JP;
Kenichi Nendai, Hyogo, JP;
Kou Sugano, Hyogo, JP;
Shuhei Yada, Osaka, JP;
Satoru Ohuchi, Osaka, JP;
Ryuuta Yamada, Kyoto, JP;
Takahiro Komatsu, Osaka, JP;
Shinya Fujimura, Osaka, JP;
Hirofumi Fujita, Ehime, JP;
Kenichi Nendai, Hyogo, JP;
Kou Sugano, Hyogo, JP;
Shuhei Yada, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
Provided is an organic EL element which withstands mass production of organic EL display panels, and promises driving at a low voltage and high luminous efficiency due to excellent hole-injection efficiency. Specifically, an organic EL element is formed by sequentially laminating an anode, a hole injection layer, a buffer layer, a light-emitting layer, and a cathode on one surface of a substrate. The hole injection layer is a at least 2 nm thick tungsten oxide layer formed under predetermined film forming conditions, and includes an occupied energy level that is 1.8 eV to 3.6 eV lower than a lowest energy level of a valence band of the hole injection layer in terms of a binding energy. This reduces the hole injection barrier between the anode and the hole injection layer and the hole injection barrier between the hole injection layer and the buffer layer.