Patent Number: 6,803,720

Title: Highly stable and efficient OLEDs with a phosphorescent-doped mixed layer architecture

Abstract: A highly stable and efficient organic light emitting device with a phosphorescent-doped mixed layer architecture comprises an anode layer; hole injecting layer over the anode layer; a mixed layer over the hole injecting layer, the mixed layer comprising an organic small molecule hole transporting material, an organic small molecule electron transporting material and a phosphorescent dopant; and a cathode layer over the mixed layer. An electron transporting layer may be present between the mixed layer and the cathode layer and a hole transporting layer may be present between the hole injecting layer and the mixed layer.

Inventors: Kwong; Raymond C. (Plainsboro, NJ), Hack; Michael G. (Pennington, NJ), Zhou; Theodore (Princeton, NJ), Brown; Julia J. (Princeton, NJ), Ngo; Tan D. (Levittown, PA)

Assignee: Universal Display Corporation

International Classification: H01L 51/50 (20060101); H01L 51/05 (20060101); H01L 51/30 (20060101); H05B 033/00 ()

Expiration Date: 10/12/2021