LED white light source with broadband excitation

US6734467B2 · kind B2 · utility

Assignee

• OSRAM Opto Semiconductors GmbH · DE

Inventors

• Karl-Heinz Schlereth · Burglengenfeld, DE
• Volker Harle · Hemau, DE
• Norbert Stath · Regensburg, DE

Key dates

• Filing date: May 3, 2002
• Grant date: May 11, 2004
• Expiry date: May 3, 2022

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10H20/811

Abstract

A white light source is described and has a UV-/blue-emitting semiconductor LED and an embedding compound provided with phosphor particles. The LED is provided with a plurality of light-emitting zones that are applied within a layer structure on a common substrate. An emission maxima of the light-emitting zones are energetically detuned relative to one another by different choice of the composition or of the layer thickness of the semiconductor material.