Buffer layers for organic electroluminescent devices and methods of manufacture and use

US7166010B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Sergey Lamansky · Redmond, US
• Manoj Nirmal · Saint Paul, US
• Fred B. McCormick · Maplewood, US
• Ralph R. Roberts · Cottage Grove, US
• John P. Baetzold · North St. Paul, US
• Todd D. Jones · Windom, US

Key dates

• Filing date: Apr 29, 2005
• Grant date: Jan 23, 2007
• Expiry date: Jul 22, 2025

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K85/649

Abstract

Organic electroluminescent device can be formed with multiple layers including an electrode, an emission layer, and a buffer layer. The emission layer includes a light emitting material. The buffer layer is disposed between and in electrical communication with the electrode and the emission layer and includes a triarylamine hole transport material and an electron acceptor material. The buffer layer optionally includes one or more of a) a polymeric binder, b) a color converting material, and c) light scattering particles. The buffer layer can also be formed using a polymeric hole transport material having a plurality of triarylamine moieties.