Organic light-emitting diode with high contrast ratio

US6545409B2 · kind B2 · utility

Assignee

• EASTMAN KODAK COMPANY · US

Inventor

• Keith B. Kahen · Rochester, US

Key dates

• Filing date: May 10, 2001
• Grant date: Apr 8, 2003
• Expiry date: Jun 9, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E10/549

Abstract

An organic light-emitting diode includes a transparent substrate, a transparent anode layer disposed over the substrate, and a hole-transport layer disposed over the anode layer. The diode also includes a light-emitting layer disposed over the hole-transport layer, an electron-transport layer disposed over the light-emitting layer, a cathode disposed over the electron-transport layer and having a thickness selected so that light can pass through such cathode, and a light-absorbing layer disposed over the cathode. A dielectric spacer layer disposed over the light-absorbing layer and a conductive layer disposed over the spacer layer and electrically connected to the cathode so that when a voltage is applied between the transparent anode and the cathode, the light-emitting layer produces light which passes directly through the hole-transport layer and the transparent anode and substrate.