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. 27, 2015
Filed:
Mar. 12, 2012
Hiroya Tsuji, Kyoto, JP;
Varutt Kittichungchit, Osaka, JP;
Nobuhiro Ide, Osaka, JP;
Abstract
The present invention proposes a white organic electroluminescent element which is a multiunit element capable of emitting high intensity light that is important to a light source for lighting use, and can have an extended lifetime while suppressing deterioration in luminance. The organic electroluminescent element includes: a transparent electrode; and a first light-emitting unit including a blue fluorescent light-emitting layer containing a blue fluorescent light-emitting material; an intermediate layer; and a second light-emitting unit including a red phosphorescent light-emitting layer containing a red phosphorescent light-emitting material and a green phosphorescent light-emitting layer containing a green phosphorescent light-emitting material; and a reflecting electrode, wherein: the first and second light-emitting units are stacked having the intermediate layer interposed therebetween; and a film thickness (tR) of the red phosphorescent light-emitting layer and a film thickness (tG) of the green phosphorescent light-emitting layer satisfy a relation of 5*tR≦tG.