Patent · US Active

Thermally stable oxynitride phosphor and light source comprising such a phosphor

US8808577B2 · kind B2 · utility

5Cited by

4References

19Claims

0Family size

Assignee

OSRAM GmbH · DE

Inventors

Daniel Becker · Worms, DE
Wolfram Hempel · Germering, DE
Frank Jermann · Königsbrunn, DE
Bianca Pohl · Birkenfeld, DE

Key dates

Filing date	Jul 24, 2008
Grant date	Aug 19, 2014
Priority date	—
Expiry date	Oct 11, 2030

Classification

Technology area (CPC H)Electricity
CPC primaryH10H20/8512
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

A thermally stable phosphor made of the M-Si—O—N system, having a cation M and an activator D, M being represented by Ba or Sr alone or as a mixture and optionally also being combined with at least one other element from the group Ca, Mg, Zn, Cu. The phosphor is activated with Eu or Ce or Tb alone or as a mixture, optionally in codoping with Mn or Yb. The activator D partially replaces the cation M. The phosphor is produced from the charge stoichiometry MO—SiO2—SiN4/3 with an increased oxygen content relative to the known phosphor MSi2O2N2:D, where MO is an oxidic compound.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.