Electroluminescent devices comprising polymers, and processes for their use

US5376456A · kind A · utility

Assignee

• Polaroid Corporation · US

Inventors

• William J. Cumming · North Chelmsford, US
• Russell Gaudiana · Merrimack, US
• Richard T. Ingwall · Newton, US
• Eric S. Kolb · Acton, US
• Cheryl P. Petersen · Port Washington, US

Key dates

• Filing date: May 13, 1993
• Grant date: Dec 27, 1994
• Expiry date: May 13, 2013

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31678
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Electroluminescent devices have, as the active layer, a polymer having a chain comprising a plurality of electroluminescent groupings, adjacent pairs of the electroluminescent groupings being connected via two benzene rings linked by only a single covalent bond, at least one of the benzene rings bearing, at a position ortho to the covalent bond, a substituent of sufficient size that the two benzene rings are essentially not conjugated with each other. Preferred electroluminescent groupings comprise a chain of three or more para-phenylene groups connected to one another by amide, carboxy, ester, urea, urethane or vinyl groups. The polymers have a fixed conjugation length with predictable electroluminescent properties.