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

US6803720B2 · kind B2 · utility

Assignee

• UNIVERSAL DISPLAY CORPORATION · US

Inventors

• Raymond Kwong · Plainsboro, US
• Michael Hack · Sabre City, US
• Theodore Zhou · Princeton, US
• Julia J. Brown · Yardley, US
• Tan Ngo · Levittown, US

Key dates

• Filing date: Dec 15, 2000
• Grant date: Oct 12, 2004
• Expiry date: Mar 16, 2022

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K2101/90

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.