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White light-emitting organic electroluminescent devices

United States Patent

June 20, 2006
View the Complete Patent at the US Patent & Trademark Office
A light-emitting device comprises a light-emitting member, which comprises two electrodes, at least two organic electroluminescent ("EL") materials disposed between the electrodes, a charge blocking material disposed between the electrodes, and at least one photoluminescent ("PL") material. The light-emitting member emits electromagnetic ("EM") radiation having a first spectrum in response to a voltage applied across the two electrodes. The PL material absorbs a portion of the EM radiation emitted by the light-emitting member and emits EM radiation having second spectrum different than the first spectrum. Each of the organic EL materials emits EM radiation having a wavelength range selected from the group consisting of blue and red wavelength ranges.
Shiang; Joseph John (Niskayuna, NY), Duggal; Anil Raj (Niskayuna, NY), Parthasarathy; Gautam (Saratoga Springs, NY)
General Electric Company (Niskayuna, NY)
10/ 328,263
December 23, 2002
This invention was first conceived or reduced to practice in the performance of work under contract DE-FC26-00NT-40989 awarded by the United States Department of Energy. The United States of America may have certain rights to this invention.