α-Sialon, α-sialon phosphor and method for...

Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides

Reexamination Certificate

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C252S30140H, C252S30140R

Reexamination Certificate

active

07906040

ABSTRACT:
An α-sialon is offered which is represented by general formula: (M1)X(M2)Y(Si, Al)12(O, N)16(wherein M1 represents one or more elements selected from the group which consists of Li, Mg, Ca, Y and lanthanoid (except La and Ce) and M2 represents one or more elements selected from the group which consists of Ce, Pr, Eu, Tb, Yb and Er and wherein 0.3<X+Y<1.5 and 0<Y<0.7), the α-sialon containing from 30 ppm to 1% of fluorine as an impurity. By making primary particles of the α-sialon 1 to 10 μm in average particle size, an α-sialon phosphor can be obtained reproducibly, stably and in a large quantity. Especially, if containing 30 to 200 ppm of impurity fluorine, the α-sialon phosphor can exhibit an excellent emission characteristic as a white fluorescent matter.

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Forms PCT/IB/338; PCT/IB/373 and PCT/ISA/237 issued in corresponding International Application PCT/JP2005/011207 mailed Jan. 4, 2007.
International Search Report of PCT/JP2005/011207, date of mailing Oct. 4, 2005.

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