The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 21, 2006
Filed:
Feb. 03, 2004
Hailiang Wang, Camarillo, CA (US);
Frank P. Uckert, Santa Barbara, CA (US);
Sunghan Kim, Goleta, CA (US);
Hailiang Wang, Camarillo, CA (US);
Frank P. Uckert, Santa Barbara, CA (US);
Sunghan Kim, Goleta, CA (US);
E.I. du Pont de Nemours and Company, Wilmington, DE (US);
DuPont Displays, Inc., Santa Barbara, CA (US);
Abstract
The energy levels (HOMO, LUMO) of the conjugated polymer are tuned independently, so that an energy match on both sides of the device can be accomplished while keeping the emission color in the blue region. Such polymers can be formed by polymerization of a mixture of monomers. The mixture of the monomers contains at least one monomer having an electron-deficient group sandwiched by two aromatic hydrocarbon groups ('Monomer (I)') and at least one hole transporting ('HT') monomer. The mixture of monomers may also contain a solubility enhancement (“SE”) monomer and/or a Branching Monomer. Such polymers can be used in fabricating light emitting diodes to achieve some of the best device performance to date including high efficiency and blue color purity.