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AssigneePolaroid Corporation
InventorsWilliam J. Cumming, Russell A. Gaudiana, Richard T. Ingwall, Eric S. Kolb, Cheryl P. Petersen
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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 to each other only by 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 length of the bond connecting the two benzene rings is not less than 1.495 Angstroms. 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 least one substituent at a position ortho to said covalent bond, the number and size of said ortho substituent(s) being such that the length of the bond connecting said two benzene rings is not less than 1.495 Angstroms.
Dependencies are inferred from the claim text.