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:
Dec. 20, 2022
Filed:
Apr. 20, 2018
Sumitomo Chemical Company, Limited, Tokyo, JP;
SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo, JP;
Abstract
A composition which is useful for producing a light emitting device having excellent external quantum efficiency contains two or more compounds represented by the formula (C-1) and a phosphorescent compound, in which at least one of the compounds represented by the formula (C-1) is a compound in which Ris a group represented by the formula (C'-1). Ring Rand Ring Rrepresent an aromatic hydrocarbon ring or an aromatic hetero ring. Rrepresents an oxygen atom, a sulfur atom or a group represented by the formula (C′-1). Ring Rand Ring Rrepresent an aromatic hydrocarbon ring or an aromatic hetero ring. R′ represents a carbon atom, a silicon atom, a germanium atom, a tin atom or a lead atom.