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:
Mar. 17, 2009
Filed:
Mar. 28, 2002
Kazumi Nii, Kanagawa, JP;
Hisashi Okada, Kanagawa, JP;
Kazumi Nii, Kanagawa, JP;
Hisashi Okada, Kanagawa, JP;
FUJIFILM Corporation, Tokyo, JP;
Abstract
A light-emitting element comprises a substrate, a pair of opposed electrodes between which are provided a light-emitting layer containing at least one light-emitting material selected from compounds of general formula (I) and a host material, and which has an organic membrane having a larger ionization potential than that of the host material between the light-emitting layer and a cathode, with the organic membrane being in contact with the light-emitting layer: general formula (I) wherein Rto Rmay be the same or different and each represents a hydrogen atom or a substituent, X represents an oxygen atom, a sulfur atom or N—R, Rrepresents a hydrogen atom or a substituent, L represents a linking group comprising a conjugated bond, Rand Rmay be the same or different and each represents a hydrogen atom or a substituent, with at least one of them being an electron-withdrawing group.