Tandem OLED having an organic intermediate connector

US7494722B2 · kind B2 · utility

Assignee

• EASTMAN KODAK COMPANY · US

Inventors

• Liang-Sheng Liao · Rochester, US
• Wojciech K. Slusarek · Rochester, US
• Tukaram K. Hatwar · Penfield, US
• Michele L. Ricks · Rochester, US
• Dustin L. Comfort · Webster, US

Key dates

• Filing date: Feb 23, 2005
• Grant date: Feb 24, 2009
• Expiry date: Oct 29, 2026

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S428/917

Abstract

A tandem OLED includes an anode and a cathode. The OLED also includes at least two electroluminescent units disposed between the anode and the cathode, wherein each of the electroluminescent units includes at least one hole-transporting layer and one organic light-emitting layer. An intermediate connector is disposed between adjacent electroluminescent units, wherein the intermediate connector includes an n-doped organic layer and an electron-accepting layer, the electron-accepting layer being disposed closer to the cathode than the n-doped organic layer, and wherein the electron-accepting layer includes one or more organic materials, each having a reduction potential greater than −0.5 V vs. a Saturated Calomel Electrode, and wherein the one or more organic materials constitute more than 50% by volume of the electron-accepting layer.