White-emitting LED having a defined color temperature

US7965031B2 · kind B2 · utility

Assignees

• OSRAM Gesellschaft mit beschraenkter Haftung · DE
• OSRAM Opto Semiconductors GmbH · DE

Inventors

• Herbert Brunner · Sinzing, DE
• Tim Fiedler · Birkenfeld, DE
• Frank Jermann · Königsbrunn, DE
• Jörg Strauβ · Regensburg, DE
• Martin Zachau · Geltendorf, DE

Key dates

• Filing date: Sep 24, 2004
• Grant date: Jun 21, 2011
• Expiry date: Nov 18, 2025

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01L2224/73265
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

LED with a low color temperature up to 3500 K, comprising a blue-emitting LED with two phosphors in front of it, a first phosphor from the class of the oxynitridosilicates, having a cation M, which is doped with divalent Europium, and has the empirical formula M(1-c)Si2O2N2:Dc, with M=Sr, or M=Sr(1-x-y)BayCax with x+y<0.5 being used, the oxynitridosilicate completely or predominantly comprising the high-temperature-stable modification HT, and a second phosphor from the class of the nitridosilicates of formula (Ca,Sr)2Si5N8:Eu.