Nitridosilicates co-doped with zirconium and hafnium

US9028716B2 · kind B2 · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Holger Winkler · Darmstadt, DE
• Ralf Petry · Griesheim, DE
• Tim Vosgroene · Ober-Ramstadt, DE
• Thomas Juestel · Aachen, DE
• Dominik Uhlich · Steinfurt, DE
• Danuta Dutczak · Steinfurt, DE

Key dates

• Filing date: Feb 1, 2010
• Grant date: May 12, 2015
• Expiry date: Apr 10, 2032

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01L2924/181
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to compounds of the formula (I) Ma2-y (Ca,Sr,Ba)1-x-ySi5-zMezN8:Eux Cey (I), where Ma=Li, Na and/or K Me=Hf4+ and/or Zr4+ x=0.0015 to 0.20 and y=0 to 0.15 z<4, and to a process for the preparation of these compounds and to the use as phosphors and conversion phosphors for conversion of the blue or near-UV emission from an LED.