Light emitting device

US7659546B2 · kind B2 · utility

Assignee

• Hong Kong Applied Science and Technology Research Institute Company Limited · CN

Inventors

• Ming Lu · Luodong, TW
• Geoffrey Wen-Tai Shuy · Tsuen Wan, CN

Key dates

• Filing date: Dec 23, 2005
• Grant date: Feb 9, 2010
• Expiry date: Jan 3, 2026

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01L2924/0002

Abstract

A light emitting device firstly includes a light emitting diode (LED) structure, having a top surface with a light emitting region. The device also has a heterojunction within the device structure, the heterojunction having a p-type and an n-type semiconductor layer, and a plurality of electrodes positioned on the top surface, each being electrically connected to one of the p-type and n-type semiconductor layers. At least a first and a second electrodes are connected to a same type semiconductor layer and are physically separated from each other. The device further includes a first and a second heterojunction regions within the heterojunction, each being respectively defined between one of the first and second electrodes and one of the other electrodes connected to the other type semiconductor layer. The first and second heterojunction regions are alternatively driven for emitting lights in the time domain.