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:
Feb. 03, 2015
Filed:
Jan. 16, 2013
Panasonic Corporation, Osaka, JP;
Kenji Harada, Hyogo, JP;
Seiji Nishiyama, Osaka, JP;
Takahiro Komatsu, Osaka, JP;
Takayuki Takeuchi, Hyogo, JP;
Satoru Ohuchi, Osaka, JP;
Hirofumi Fujita, Osaka, JP;
Shinya Fujimura, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An organic EL element comprising: an anode; a cathode; banks; a functional layer between the anode and the cathode, the functional layer including one or more sublayers including a light-emitting sublayer, the light-emitting sublayer defined by the banks and containing an organic material; and a hole injection layer between the anode and the functional layer, wherein the hole injection layer comprises tungsten oxide. An Ultraviolet Photoelectron Spectroscopy (UPS) spectrum, obtained from a UPS measurement, has a protrusion appearing near a Fermi surface and within a region corresponding to a binding energy range lower than a top of a valence band. The tungsten oxide contained in the hole injection layer satisfies a condition, determined from an X-ray Photoelectron Spectroscopy (XPS) measurement, that a ratio in a number density of atoms other than tungsten atoms and oxygen atoms to the tungsten atoms does not exceed approximately 0.83.