Thermally stable oxynitride phosphor and light source comprising such a phosphor
AssigneeOSRAM GmbH
InventorsDaniel Becker, Wolfram Hempel, Frank Jermann, Bianca Pohl
Life of this patent
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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.
Claims19
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 being activated with Eu or Tb alone or as a mixture, optionally in codoping with Mn or Yb, the activator D partially replacing the cation M, and the phosphor emits green, wherein 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, and the phosphor has the stoichiometry MaSib+3cOa+2bN4c, in which the ratio of b:c is from 4.8 to 9.0, wherein a is from 1 to 3.
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 being activated with Eu or Tb alone or as a mixture, optionally in codoping with Mn or Yb, the activator D partially replacing the cation M, and the phosphor emits green, wherein 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, and the phosphor has the stoichiometry MaSib+3cOa+2bN4c, in which the ratio of a:c is from 3.5 to 5.5, wherein b is from 1 to 5.5.
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 being activated with Eu or Tb alone or as a mixture, optionally in codoping with Mn or Yb, the activator D partially replacing the cation M, and the phosphor emits green, wherein 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, and the phosphor has the stoichiometry MaSib+3cOa+2bN4c, in which the ratio of a:c is from 3.5 to 5.5, the ratio of b:c is from 4.8 to 9.0, and wherein c is from 0.131 to 2.675.
Dependencies are inferred from the claim text.