Illumination unit having at least one LED as light source

US6657379B2 · kind B2 · utility

Assignee

• Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

• Andries Ellens · Munich, DE
• Gunter Huber · Schrobenhausen, DE
• Franz Kummer · Munich, DE

Key dates

• Filing date: Jul 3, 2002
• Grant date: Dec 2, 2003
• Expiry date: Jul 3, 2022

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01L2224/73265
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An illumination unit having at least one LED as light source, the LED emitting primary radiation in the range from 300 to 485 nm, this radiation being partially or completely converted into longer-wave radiation by phosphors which are exposed to the primary radiation of the LED, in which unit the conversion takes place at least with the aid of a phosphor which emits yellow-orange with a peak emission wavelength at 540 to 620 nm and originates from the class of the Eu-activated sialons, the sialon corresponding to the formula Mp/2Si12−p−qAlp+qOqN16−q:Eu2+, where M=Ca individually or in combination with Mg or Sr, where q=0 to 2.5 and p=0 to 3.