Organic light emitting device architecture for reducing the number of organic materials

US8040053B2 · kind B2 · utility

Assignee

• UNIVERSAL DISPLAY CORPORATION · US

Inventors

• Brian D'Andrade · Willingboro, US
• James Esler · Yardley, US

Key dates

• Filing date: Dec 11, 2008
• Grant date: Oct 18, 2011
• Expiry date: Jul 7, 2029

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K50/125

Abstract

An organic light emitting device is provided. The device includes an anode and a cathode. A first emissive layer is disposed between the anode and the cathode. The first emissive layer includes a first non-emitting organic material, which is an organometallic material present in the first emissive layer in a concentration of at least 50 wt %. The first emissive layer also includes a first emitting organic material. A second emissive layer is disposed between the first emissive layer and the cathode, preferably, in direct contact with the first emissive layer. The second emissive material includes a second non-emitting organic material and a second emitting organic material. The first and second non-emitting materials, and the first and second emitting materials, are all different materials. A first non-emissive layer is disposed between the first emissive layer and the anode, and in direct contact with the first emissive layer. The first non- emissive layer comprises the first non-emissive organic material.