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AssigneePolaroid Corporation
InventorsWilliam J. Cumming, Russell A. Gaudiana, Richard T. Ingwall, Eric S. Kolb, Cheryl P. Petersen
Estimating the term…
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.
A process for generating electromagnetic radiation, which process comprises:
An electroluminescent device comprising a first electrode, a second electrode and a layer of an electroluminescent polymer disposed between, and in electrical contact with, the first and second electrodes, wherein the electroluminescent polymer is a polymer having a chain comprising a plurality of electroluminescent groupings, at least one adjacent pair of the electroluminescent groupings being connected via two benzene rings linked to each other only by a single covalent bond, at least one of said benzene rings bearing, at a position ortho to said covalent bond, a branched chain alkyl, branched chain alkoxy or trihalomethyl substituent.
Dependencies are inferred from the claim text.