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AssigneeE. I. du Pont de Nemour and Company
InventorsFrank P. Uckert, Howard E. Simmons III
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Polymeric compositions are provided comprising a first plurality of first monomeric units comprising an aromatic group with at least one substituent selected from alkyl, heteroalkyl, alkenyl, heteroalkenyl, alkynyl, heteroalkynyl, aryl, arylalkyl, heteroaryl, heteroarylalkyl, and amino, and a second plurality of second multi-functional monomeric units, wherein each multi-functional monomeric unit is capable of forming a branching point in the polymeric composition, thereby resulting in a branched material. Invention compositions therefore have an altered morphology relative to similar non-branched materials. When used to form an EL layer within an EL device, this altered morphology results in EL layers with improved efficiency, which in turn results in more efficient EL devices.
A polymeric composition comprising:
A method for improving efficiency of an electroluminescent device having at least one active layer comprising an aromatic polymer, comprising incorporating into the aromatic polymer a plurality of multi-functional monomeric units that form branching points in the aromatic polymer, thereby improving efficiency of the electroluminescent device.
A method for improving efficiency of an electroluminescent device having at least one active layer comprising a fluorene polymer, comprising incorporating into the fluorene polymer a plurality of multi-functional monomeric units that form branching points in the fluorene polymer, thereby improving efficiency of the electroluminescent device.
A polymeric composition comprising:
Dependencies are inferred from the claim text.