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Extended OLED operational lifetime through phosphorescent dopant profile management

United States Patent

May 30, 2017
View the Complete Patent at the US Patent & Trademark Office
This disclosure relates, at least in part, an organic light emitting device, which in some embodiments comprises an anode; a cathode; a first emissive layer disposed between the anode and the cathode, the first emissive layer comprising an electron transporting compound and a phosphorescent emissive dopant compound; and wherein the phosphorescent emissive dopant compound has a concentration gradient, in the emissive layer, which varies from the cathode side of the first emissive layer to the anode side of the emissive layer.
Forrest; Stephen R. (Ann Arbor, MI), Zhang; Yifan (Ann Arbor, MI)
The Regents of the University of Michigan (Ann Arbor, MI)
14/ 537,414
November 10, 2014
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with U.S. Government support under Contract No. DE-SC0001013-sub-K113153 awarded by the Department of Energy. The government may have certain rights in this invention.