Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides
Reexamination Certificate
2007-06-07
2011-12-20
Koslow, Carol M (Department: 1734)
Compositions
Inorganic luminescent compositions
Compositions containing halogen; e.g., halides and oxyhalides
C313S486000
Reexamination Certificate
active
08080174
ABSTRACT:
A fluorescent material comprising: a β-Sialon expressed by the general formula Si6-ZAlZOZN8-Zas a host material; and Eu dissolved in solid solution as a luminescence center, is a powder which, when measured by the laser diffraction scattering method, gives particle diameter distribution in which cumulative 10% diameter (D10) falls within the 7 μm to 20 μm range and 90% diameter (D90) within the 50 μm to 90 μm range, and can be used as a fluorescent material low in luminescence intensity degradation ideal for illuminators. This fluorescent material can be produced by subjecting a raw powder, which is obtained by mixing a silicon nitride powder, aluminum nitride powder, and aluminum-containing or Eu-containing compound as required, to heating at 1850° C. to 2050° C. for 9 hours or longer in a nitrogen or nonoxidizing atmosphere.
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Kawagoe Mitsuru
Kawasaki Takashi
Chen Yoshimura LLP
Denki Kagaku Kogyo Kabushiki Kaisha
Koslow Carol M
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