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:
Jul. 04, 2017
Filed:
Sep. 12, 2014
Semiconductor Energy Laboratory Co., Ltd., Kanagawa-ken, JP;
Hideko Inoue, Kanagawa, JP;
Tomohiro Kubota, Kanagawa, JP;
Satoshi Seo, Kanagawa, JP;
Hayato Yamawaki, Kanagawa, JP;
Yasushi Kitano, Kanagawa, JP;
Abstract
A composition comprising a dibenzo[f,h]quinoxaline derivative in which impurities are reduced and a method of synthesizing dibenzo[f,h]quinoxaline in which impurities are reduced are provided. In addition, a light-emitting element, a light-emitting device, an electronic appliance, or a lighting device with high emission efficiency and high reliability in which dibenzo[f,h]quinoxaline is used as an EL material is provided. In the synthesis method,-(chloroaryl)dibenzo[f,h]quinoxaline is used as a synthetic intermediate in a synthetic pathway so that an impurity contained in a final product can be removed easily by purification by sublimation.