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Phosphorescent organic light emitting diodes with high efficiency and brightness

United States Patent

November 10, 2015
View the Complete Patent at the US Patent & Trademark Office
An organic light emitting device including a) an anode; b) a cathode; and c) an emissive layer disposed between the anode and the cathode, the emissive layer comprising an organic host compound and a phosphorescent compound exhibiting a Stokes Shift overlap greater than 0.3 eV. The organic light emitting device may further include a hole transport layer disposed between the emissive layer and the anode; and an electron transport layer disposed between the emissive layer and the cathode. In some embodiments, the phosphorescent compound exhibits a phosphorescent lifetime of less than 10 .mu.s. In some embodiments, the concentration of the phosphorescent compound ranges from 0.5 wt. % to 10 wt. %.
Forrest; Stephen R. (Ann Arbor, MI), Zhang; Yifan (Ann Arbor, MI)
The Regents of the University of Michigan (Ann Arbor, MI)
14/ 268,398
May 2, 2014
STATEMENT AS TO RIGHTS TO INVENTIONS MADE UNDER FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This work was supported by the U.S. Department of Energy (DOE), Office of Basic Energy Sciences, as part of the Center for Energy Nanoscience, Energy Frontier Research Center, Grant #DE-SC0001013 through the University of Southern California.