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. 14, 2020
Filed:
Mar. 21, 2017
Sumitomo Chemical Company, Limited, Tokyo, JP;
Cambridge Display Technology Limited, Cambridgeshire, GB;
Takayuki Iijima, Tsukuba, JP;
Satoshi Kobayashi, Tsukuba, JP;
Masanobu Tanaka, Tsukuba, JP;
Nobuhiko Akino, Tsukuba, JP;
Sheena Zuberi, Cambridgeshire, GB;
SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo, JP;
Cambridge Display Technology Limited, Cambridgeshire, GB;
Abstract
Provided is a light-emitting device including an anode, a light-emitting layer, an electron-transporting layer and a cathode. The electron-transporting layer contains at least one electron-transporting material whose LUMO level is −3.0 eV or more and at least one dopant material selected from the group consisting of a heterocyclic compound whose SOMO level is −2.2 to −1.5 eV and a derivative thereof. The LUMO level of the electron-transporting material is smaller than the SOMO level of the heterocyclic compound.