Preparation of sulphides
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United States of America Patent
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May 11, 2004
Grant Date -
Oct 30, 2003
app pub date -
Apr 26, 2002
filing date -
Oct 28, 1999
priority date (Note) -
Expired
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Abstract
Sulphides are prepared by combining a dithionite compound with an aqueous alkaline solution of an appropriate cation or mixture of cations. On heating the corresponding sulphides are precipitated. The dithionite compound may be a dithionite dianion which is produced as an intermediary when thiourea dioxide is used as a starting material in the solution. Examples of appropriate cations are zinc (as zinc acetate) and copper (as copper acetate). The precipitate is dried and subsequently fired to produce high quality sulphides which may be used as phosphors or other optoelectronic materials.
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