LED with improved light emission profile

US7969089B2 · kind B2 · utility

Assignee

• KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

• Helmut Bechtel · Aachen, DE
• Wolfgang Busselt · Roetgen, DE
• Georg Gartner · Aachen, DE
• Eliav Itzhak · Eindhoven, NL
• Joachim Opitz · Aachen, DE

Key dates

• Filing date: Jun 10, 2005
• Grant date: Jun 28, 2011
• Expiry date: Mar 16, 2026

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K50/858

Abstract

An LED includes a substrate, a first electrode layer and a thin colloidal layer located between the substrate and the first electrode layer. A smoothening layer or particles located within or on the colloidal layer is provided so that the roughness of the outer surface of the colloidal layer which is facing towards the first electrode layer is Ra≦30 nm and Ra≧1 nm.