Tandem organic electroluminescent element

US10147899B2 · kind B2 · utility

Assignee

• TENCENT TECHNOLOGY (SHENZHEN) COMPANY LIMITED · CN

Inventors

• Aiguo TU · Lo Wu, CN
• Wei Yuan · Qingdao, CN

Key dates

• Filing date: Feb 15, 2017
• Grant date: Dec 4, 2018
• Expiry date: Feb 15, 2037

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K50/19

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.