Poly (p-phenyleneneacetylene) light-emitting diodes

US5352906A · kind A · utility

Assignee

• IOWA STATE UNIVERSITY RESEARCH FOUNDATION, INC. · US

Inventors

• Joseph Shinar · Ames, US
• Leland Swanson · McKinney, US
• Feng Lu · Shanghai, CN
• Yiwei Ding · Ballwin, US
• Thomas J. Barton · Ames, US
• Zeev Valentine Vardeny · Holladay, US

Key dates

• Filing date: Jan 29, 1993
• Grant date: Oct 4, 1994
• Expiry date: Jan 29, 2013

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K50/11

Abstract

Acetylene containing poly(p-phenyleneacetylene) (PPA) - based light-emitting diodes (LEDs) are provided. The LEDs are fabricated by coating a hole-injecting electrode, preferably an indium tin oxide (ITO) coated glass substrate, with a PPA polymer, such as a 2,5-dibutoxy or a 2,5-dihexoxy derivative of PPA, dissolved in an organic solvent. This is then followed by evaporating a layer of material capable of injecting electrons, such as Al or Al/Ca, onto the polymer to form a base electrode. This composition is then annealed to form efficient EL diodes.