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Low Index Grids (LIG) To Increase Outcoupled Light From Top or Transparent OLED

United States Patent Application

20080265757
A1
View the Complete Application at the US Patent & Trademark Office
A transparent or top-emitting OLED may include regions of a material having a refractive index less than that of the organic region, allowing for emitted light in a waveguide mode to be extracted into air. These regions may 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. A method for fabricating such a transparent or top-emitting OLED is also provided.
Forrest, Stephen (Ann Arbor, MI), Sun, Yiru (Hoboken, NJ)
12/ 059,783
March 31, 2008
GOVERNMENT RIGHTS [0002] This invention was made with U.S. Government support under Contract No. DE-FG02-04ER84113 awarded by the Department of Energy. The government has certain rights in this invention.