Polyimide layer comprising functional material, device employing the same and method of manufacturing same device

US6649283B1 · kind B1 · utility

Assignees

• Sony International GmbH · DE
• Max-Planck-Gesellschaft zur Föderung der Wissenschaften e.V. · US

Inventors

• Donald Lupo · Frankfurt am Main, DE
• Akio Yasuda · Eßlingen, DE
• Martin F. Grell · Sheffield, GB
• Dieter Neher · Mainz, DE
• Tzenka Miteva · Stuttgart, DE
• Andreas Meisel · San Francisco, US

Key dates

• Filing date: Dec 8, 2000
• Grant date: Nov 18, 2003
• Expiry date: Dec 8, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31721

Abstract

The invention relates to novel layers comprising polyimide and organic functional material such as hole transport material, electron transport material and/or emitter material having a glass transition temperature of higher than 80° C. The layers can be prepared by mixing the functional material with a polyimide precursor material, forming a thin film out of the mixture and converting said mixture into doped polyimide. Said doped polyimide layers can be used for the manufacture of electronic and optoelectronic devices such as e.g. light emitting devices. Due to the content of functional material, they can act as hole transport, electron transport or emitter layer. Moreover, the layers can be processed to have aligning properties for liquid crystals, thus allowing the manufacture of devices emitting polarized light. Furthermore, after conversion to doped polyimide, the layers are resistant to solvent treatment allowing the preparation of multi-layers by successive coating and conversion cycles.