LED doped with periflanthene for efficient red emission

US6004685A · kind A · utility

Assignee

• Hewlett-Packard Company & The Board of Regents of The University of Texas System · US

Inventors

• Homer Antoniadis · Mountain View, US
• Allen J. Bard · Austin, US

Key dates

• Filing date: Dec 23, 1997
• Grant date: Dec 21, 1999
• Expiry date: Dec 23, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S428/917
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

An OLED having a cathode constructed from a first conducting layer. An electron transport layer constructed from a first electron transport material overlays the cathode. An electroluminescent layer constructed from the first electron transport material doped with dibenzotetraphenylperiflanthene overlays the electron transport layer. A hole transport layer constructed from a first hole transport material overlays the electroluminescent layer. The anode overlays the hole transport layer. In one embodiment of the invention, a second hole transport layer constructed from a second hole transport material is sandwiched between the anode and the first hole transport layer. In a third embodiment of the invention, a second electron transport layer constructed from a second electron transport material is sandwiched between the electroluminescent layer and the first hole transport layer.