Rare-earth phosphate colloidal dispersion, method for the production thereof and a transparent luminescent material obtainable from said dispersion
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United States of America Patent
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Issued Date -
Jun 14, 2007
app pub date -
Sep 15, 2004
filing date -
Sep 18, 2003
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Abstract
The invention relates to a colloidal dispersion comprising rhabdophane-structured rare-earth phosphate particles (Ln) and a polyphosphate. Said dispersion is prepared by a method consisting in forming a medium comprising at least one type of rare-earth salt and a poly phosphate in such quantities that the P/Ln ratio is equal to or higher than 3, in heating the thus obtained medium and in removing residual salts, thereby obtaining said dispersion. Said invention also relates to a transparent luminescent material which is obtainable from said dispersion and based on the rare-earth phosphate particles and a polyphosphate and whose P/Ln ratio is higher than 1, to a luminescent system comprising said material and to an excitation source.
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