B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
B01J 13/00 (2006.01) C09K 11/02 (2006.01) C09K 11/81 (2006.01)
Patent
CA 2536334
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.
L'invention concerne une dispersion colloïdale qui comprend des particules d'un phosphate de terre rare (Ln) de structure rhabdophane et en outre un polyphosphate. Elle est préparée par un procédé dans lequel on forme un milieu comprenant au moins un sel de terre rare et un polyphosphate dans des quantités telles que le rapport P/Ln soit d'au moins 3; puis on chauffe le milieu ainsi obtenu et on élimine les sels résiduels ce par quoi on obtient la dispersion. L'invention concerne aussi un matériau transparent luminescent, qui peut être obtenu à partir de cette dispersion et qui est à base de particule d'un phosphate de terre rare et d'un polyphosphate et dans lequel le rapport P/Ln est supérieur à 1, ainsi qu'un système luminescent comprenant ce matériau et une source d'excitation.
Boilot Jean-Pierre
Buissette Valerie
Chane-Ching Jean-Yves
Gacoin Thierry
Le Mercier Thierry
Centre National de La Recherche Scientifique
Rhodia Electronics And Catalysis
Robic
LandOfFree
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