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:
Nov. 17, 2020
Filed:
Mar. 28, 2019
Canon Kabushiki Kaisha, Tokyo, JP;
Tetsuo Takahashi, Kawasaki, JP;
Satoru Shiobara, Hiratsuka, JP;
Koichi Ishige, Yokohama, JP;
Tomona Yamaguchi, Tokyo, JP;
Koji Ishizuya, Fujisawa, JP;
Takayuki Ito, Kawasaki, JP;
Norifumi Kajimoto, Zama, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
One embodiment of this invention has a first electrode, a first light emitting layer, and a second electrode, in which the first light emitting layer has a first host material and a first dopant material, a lowest triplet excitation energy of the first host material is higher than a lowest triplet excitation energy of the first dopant material, and, when a weight of the first light emitting layer is set to 100 wt %, a concentration of the first dopant material is 0.3 wt % or less.