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Organic light emitting device structures for obtaining chromaticity stability

United States Patent

April 26, 2005
View the Complete Patent at the US Patent & Trademark Office
The present invention relates to organic light emitting devices (OLEDs). The devices of the present invention are efficient white or multicolored phosphorescent OLEDs which have a high color stability over a wide range of luminances. The devices of the present invention comprise an emissive region having at least two emissive layers, with each emissive layer comprising a different host and emissive dopant, wherein at least one of the emissive dopants emits by phosphorescence.
Tung; Yeh-Jiun (Princeton, NJ), Lu; Michael (Lawrenceville, NJ), Kwong; Raymond C. (Plainsboro, NJ)
Universal Display Corporation (Ewing, NJ)
10/ 618,160
July 10, 2003
GOVERNMENT RIGHTS This invention was made with Government support under Contract No. DE-FG02-02ER83565 awarded by the Department of Energy. The government has certain rights in this invention.