White organic light-emitting devices with improved efficiency

US6627333B2 · kind B2 · utility

Assignee

• EASTMAN KODAK COMPANY · US

Inventor

• Tukaram K. Hatwar · Penfield, US

Key dates

• Filing date: Aug 15, 2001
• Grant date: Sep 30, 2003
• Expiry date: Oct 26, 2021

Classification

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

Abstract

An organic light-emitting diode (OLED) device which produces substantially white light includes a substrate; an anode disposed over the substrate; and a hole injecting layer disposed over the anode. The device also includes a hole transport layer disposed over the hole injecting layer; a light-emitting layer doped with a blue light-emitting compound, disposed directly on the hole transport layer; and an electron transport layer disposed over the blue light-emitting layer. The device further includes a cathode disposed over the electron transport layer; and the hole transport layer, electron transport layer, or the electron transport layer and the hole transport layer being selectively doped in a region which corresponds to an entire layer or a partial portion of a layer in contact with the blue light-emitting layer, the selective doping being with a compound which emits light in the yellow region of the spectrum.