C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 11/78 (2006.01) C09K 11/81 (2006.01)
Patent
CA 2752664
The invention relates to a composition, as well as to a phosphor containing said composition, including an inorganic core and a europium and yttrium oxide or gadolinium shell uniformly covering the inorganic core at a thickness greater than or equal to 300 nm. The composition is produced by: forming a suspension including the inorganic core and the pH of which is 8 to 11; adding a solution containing a europium salt and an yttrium or gadolinium salt to the suspension and maintaining the pH of the reaction medium at a constant value; and separating the formed solid and calcining same to a temperature of 1000°C at most.
L'invention concerne une composition, ainsi qu'un luminophore à base de cette composition, qui comprend un coeur minéral et une coquille à base d'europium et d'un oxyde d'ytthum ou de gadolinium et recouvrant de façon homogène le coeur minéral sur une épaisseur égale ou supérieure à 300 nm. La composition est obtenue en formant une suspension comprenant le coeur minéral et dont le pH est compris entre 8 et 11; en ajoutant à la suspension une solution contenant un sel d'europium et un sel d'yttrium ou de gadolinium et en maintenant le pH du milieu réactionnel à une valeur constante; en séparant le solide formé et en le calcinant à une température d'au plus 1000°C.
Buissette Valerie
Le-Mercier Thierry
Rhodia Operations
Robic
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