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OLED with improved light outcoupling

United States Patent

9,508,957
November 29, 2016
View the Complete Patent at the US Patent & Trademark Office
An OLED may include regions of a material having a refractive index less than that of the substrate, or of the organic region, allowing for emitted light in a waveguide mode to be extracted into air. These regions can be placed adjacent to the emissive regions of an OLED in a direction parallel to the electrodes. The substrate may also be given a nonstandard shape to further improve the conversion of waveguide mode and/or glass mode light to air mode. The outcoupling efficiency of such a device may be up to two to three times the efficiency of a standard OLED. Methods for fabricating such a transparent or top-emitting OLED is also provided.
Forrest; Stephen (Ann Arbor, MI), Sun; Yiru (Forrest Hills, NY)
The Regents of the University of Michigan (Ann Arbor, MI)
12/ 531,595
20100181899
March 31, 2008
GOVERNMENT RIGHTS This invention was made with U.S. Government support under Contract Nos. DE-FG02-04ER84113 and DE-FC26-04NT42272 awarded by the Department of Energy. The government has certain rights in this invention.