Organic light-emitting devices

US6806491B2 · kind B2 · utility

Assignee

• TSINGHUA UNIVERSITY · CN

Inventors

• Yong Qiu · Beijing, CN
• Yudi Gao · Beijing, CN
• Peng Wei · Nanhu, CN
• Deqiang Zhang · Beijing, CN
• Liduo Wang · Beijing, CN

Key dates

• Filing date: Jan 24, 2003
• Grant date: Oct 19, 2004
• Expiry date: Jan 24, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S977/95

Abstract

An organic light-emitting device including a transparent substrate, a first electrode layer, a second electrode layer, a hole-transporting layer, and a electron-transporting layer sandwiched between the first and second electrode layers, wherein the hole-transporting layer consists of organic multiple-quantum-well structure. The multiple-quantum-well structure has a period number of alternating layers formed of a layer of organic material A with wide energy gap and a layer of organic material B with narrow energy gap. Organic material A and organic material B are selected such that the highest occupied molecular orbital (HOMO) levels of organic material A are lower than those of organic material B and the lowest unoccupied molecular orbital (LUMO) levels of organic material A are higher than those of organic material B.