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Electroluminescent device having improved light output

United States Patent

7,911,133
March 22, 2011
View the Complete Patent at the US Patent & Trademark Office
An OLED device including a transparent substrate having a first surface and a second surface, a transparent electrode layer disposed over the first surface of the substrate, a short reduction layer disposed over the transparent electrode layer, an organic light-emitting element disposed over the short reduction layer and including at least one light-emitting layer and a charge injection layer disposed over the light emitting layer, a reflective electrode layer disposed over the charge injection layer and a light extraction enhancement structure disposed over the first or second surface of the substrate; wherein the short reduction layer is a transparent film having a through-thickness resistivity of 10.sup.-9 to 10.sup.2 ohm-cm.sup.2; wherein the reflective electrode layer includes Ag or Ag alloy containing more than 80% of Ag; and the total device size is larger than 10 times the substrate thickness.
Tyan; Yuan-Sheng (Webster, NY), Preuss; Donald R. (Rochester, NY), Farruggia; Giuseppe (Webster, NY), Kesel; Raymond A. (Avon, NY), Cushman; Thomas R. (Rochester, NY)
Global OLED Technology LLC (Wilmington, DE)
11/ 746,820
May 10, 2007
This invention was made with government support under the DOE Cooperative Agreement No. DE-FC26-06NT42933 awarded by the Department of Energy. The government has certain rights to the invention.