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PHOSPHORESCENT ORGANIC LIGHT EMITTING DIODES WITH HIGH EFFICIENCY AND BRIGHTNESS

United States Patent Application

*** PATENT GRANTED ***
20140326972
9,184,402
A1
View the Complete Application 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 [0002] 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.