Transparent substrate light emitting diode

US6643304B1 · kind B1 · utility

Assignee

• AXT, INC. · US

Inventors

• John Chen · Walnut, US
• Bingwen Liang · Sunnyvale, US
• Robert Shih · Hsinchu, TW

Key dates

• Filing date: Jul 26, 2000
• Grant date: Nov 4, 2003
• Expiry date: Mar 10, 2021

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10H20/841

Abstract

A Gallium Nitride based Light Emitting Diode (LED) includes both a transparent substrate and a window for exiting light generated by the LED. Useful amounts of light may be utilized at the face of the window or at the face of the transparent substrate. An external optical reflector is formed directly on the external face of the LED which is not currently being used to exit useful light. If light from the window is being utilized, a Distributed Bragg Reflector (DBR) is formed directly on the “backside” of the substrate. However, if light through the substrate is being utilized, a Distributed Bragg Reflector is formed directly on the light emitting portion of the window.