Rhodia Operations

Franck Aurissergues

Valérie Buissette

Thierry Le-Mercier

Thierry Le Mercier

A modified phosphor is described comprising phosphor particles and at least one amphiphilic agent. Compositions comprising the modified phosphor and at least one polymer are also described.

Modified phosphors and compositions thereof

The silicate of magnesium and of barium, strontium or calcium of the invention is characterized in that it is in the form of a suspension of solid crystallized particles in a liquid phase, said particles having a mean size between 0.1 &#x3bc;m and 1 &#x3bc;m. It is prepared by spray-drying a liquid mixture comprising compounds of magnesium, of silicium and of at least one first element chosen from barium, strontium and calcium, by submitting the dried mixture to a first calcination in air and to a second calcination in a reducing atmosphere and by wet milling the calcined mixture.

Suspension of a magnesium silicate, method for making same and use thereof as a phosphor

A composition comprising an inorganic core and an aluminate shell is described. The aluminate can have the formula (1):(CeTb)MgAlO&#x2003;&#x2003;(1),where a, b, x and y comply with the relations a+b=1&#x2212;0.2&#x2266;x&#x2266;+0.2 and &#x2212;0.2&#x2266;y&#x2266;+0.2, wherein the shell uniformly covers the inorganic core over a thickness of no less than 300 nm. A phosphor is also described that can be obtained by calcinating the composition at a temperature of at least 1200&#xb0; C.

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Argenteuil, France

Franck Aurissergues