Low optical loss electrode structures for LEDs

US7897992B2 · kind B2 · utility

Assignee

• Bridgelux, Inc. · US

Inventors

• Frank Shum · Sunnyvale, US
• William W. So · Sunnyvale, US
• Steven D. Lester · Palo Alto, US

Key dates

• Filing date: Jun 29, 2009
• Grant date: Mar 1, 2011
• Expiry date: Jun 29, 2029

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10H20/857

Abstract

An electrode structure is disclosed for enhancing the brightness and/or efficiency of an LED. The electrode structure can have a metal electrode and an optically transmissive thick dielectric material formed intermediate the electrode and a light emitting semiconductor material. The electrode and the thick dielectric cooperate to reflect light from the semiconductor material back into the semiconductor so as to enhance the likelihood of the light ultimately being transmitted from the semiconductor material. Such LED can have enhanced utility and can be suitable for uses such as general illumination.