β type sialon fluorescent substance

Details β type sialon fluorescent substance β type sialon fluorescent substance

2011-08-23

2011-08-23

Koslow, Carol M (Department: 1734)

Compositions

Inorganic luminescent compositions

Compositions containing halogen; e.g., halides and oxyhalides

Reexamination Certificate

active

08003011

ABSTRACT:
A β type Sialon fluorescent substance is disclosed that is capable of achieving enhanced brightness of a white light emitting diode using blue to ultraviolet light as a light source. In the fluorescent substance which contains not less than 90% by mass of a β type Sialon composition represented by general formula: Si6-zAlzOzN8-zas a host material wherein z is not less than 0.24 and not more than 0.42, Eu is present dissolved in solid solution as a luminescent center at a content of 0.05 to 0.2% by atom. The β type Sialon fluorescent substance is preferably in the form of a powder having an average particle size of not less than 1 μm and not more than 20 μm. A white LED of good luminescent characteristics can be obtained by using a blue or ultraviolet light emitting diode as a excitation light source in combination with a fluorescent substance that emits yellow or red light.

REFERENCES:
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Hoppe et al. “Luminescence in Eu2+ -Doped Ba2Si5N8: Fluorscence, Thermoluminescence, and Upconversion”, Journal of Physics and Chemistry of Solids 61, 2000, p. 2001.

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