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. 04, 2018
Filed:
Feb. 15, 2017
Shenzhen China Star Optoelectronics Technology Co., Ltd., Shenzhen, CN;
SHENZHEN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD., Shenzhen, Guangdong, CN;
Abstract
Provided is a tandem organic electroluminescent element, comprising a first electrode, a first light emitting unit, a third electron transporting layer, a second electron transporting layer, a first electron transporting layer, a charge generation layer, a second light emitting unit and a second electrode which are stacked up from bottom to top; both the first electron transporting layer and the second electron transporting layer comprising n type dopant, and a concentration of the n type dopant in the first electron transporting layer being larger than a concentration of the n type dopant in the second electron transporting layer, and the third electron transporting layer comprising no n type dopant; the arrangement of the first, the second and the third electron transporting layers can reduce the energy barrier of injecting electrons into the first light emitting unit by the charge generation layer to make the electrons easy to be injected.