Combined internal and external extraction layers for enhanced light outcoupling for organic light emitting device

US10115930B2 · kind B2 · utility

Assignees

• UNIVERSAL DISPLAY CORPORATION · US
• Kent State University · US

Inventors

• Yue Cui · Beijing, CN
• Deng-Ke Yang · Hudson, US
• Gregory McGraw · Yardley, US
• Ruiqing Ma · Morristown, US
• Julia J. Brown · Yardley, US

Key dates

• Filing date: Jul 8, 2014
• Grant date: Oct 30, 2018
• Expiry date: Jul 8, 2034

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K2102/3026

Abstract

OLED structures including an internal extraction layer are provided. The internal extraction layer includes a material having a refractive index that is higher than the refractive index of a transparent electrode in the device, and a non-planar interface disposed between the material and the substrate. Devices are also provided that include an external extraction layer having a non-planar surface which, when used in conjunction with an internal extraction layer, provides greatly improved outcoupling of light generated by the device.