Preparation of sulphides and selenides
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United States of America Patent
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Apr 30, 2002
Issued Date -
N/A
app pub date -
Dec 7, 1999
filing date -
Jun 7, 1997
priority date (Note) -
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Abstract
Sulphides and selenides are prepared by dissolving sulphur or selenium in an aqueous or non-aqueous solution of hydrazine hydrate. The solution is combined with a solution of an appropriate cation to precipitate the corresponding sulphide or selenide. Solutions of two or more cations may be used to produce ternary compounds of sulphur and selenium, for example thio-gallates. Likewise both sulphur and selenium can be used together to produce sulpho-selenides. The method is particularly applicable to the production of doped phosphors by the inclusion of solutions containing the appropriate dopant.
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