Compound based on an alkaline-earth metal, sulphur and aluminium, gallium or indium, its method of preparation and its use as a phosphor
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United States of America Patent
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Aug 10, 2004
Grant Date -
Dec 19, 2002
app pub date -
Sep 10, 2001
filing date -
Jun 13, 2001
priority date (Note) -
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Abstract
The invention relates to a compound based on at least one element A chosen from alkaline-earth metals, on at least one element B chosen from aluminium, gallium and indium, on sulphur and on a dopant capable of giving the compound luminescence properties, which is characterized in that it is in the form of a mixture of predominantly an AB.sub.2 S.sub.4 -type crystallographic phase and a B.sub.2 S.sub.3 -type crystallographic phase. This compound is prepared by a method in which a solution or suspension comprising salts or sols of the elements A, B and of the dopant is formed in a proportion such that the B/(A+dopant) atomic ratio is at least 2.06; the solution or suspension is spray-dried; the product thus obtained is sulphurized. This compound may be used as a phosphor, especially in cathodoluminescence.
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