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:
Oct. 01, 2019
Filed:
May. 22, 2015
Sumitomo Chemical Company, Limited, Tokyo, JP;
Makoto Anryu, Osaka, JP;
Nobuhiko Akino, Tsukuba, JP;
Sumitomo Chemical Company, Limited, Tokyo, JP;
Abstract
A light emitting device excellent in luminance life includes an anode, a cathode, a first organic layer (containing at least one phosphorescent compound) disposed between the anode and cathode and a second organic layer (containing at least one phosphorescent compound and a crosslinked body) disposed between the anode and first organic layer. At least one phosphorescent compound contained in the first and second organic layers is the same phosphorescent compound and is represented by the formula (1): wherein M may be an iridium atom, nrepresents an integer of 1 or more, nmay be 0 or more, Eand Emay be a carbon atom, ring Lrepresents an aromatic heterocyclic ring, ring Lmay be an aromatic hydrocarbon ring, A-G-Arepresents an anionic bidentate ligand, and at least one of rings Land Lhas an aryl group, a monovalent heterocyclic group or a substituted amino group.