Method of preparing small particle size phosphors

C - Chemistry – Metallurgy – 09 – K

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C09K 11/84 (2006.01) C01F 17/00 (2006.01) C09K 11/77 (2006.01)

Patent

CA 2193856

A process for preparing phosphor particles having a particle size of 1 micron or less and that are spherical in shape. Such phosphors are useful, for example, as upconverter phosphors in labels for immunoassays. The process comprises preparing a dilute solution of soluble salts of the rare earth metals in amounts required to make the desired phosphor, adding a chemical agent that releases hydroxyl ions, precipitating small spherical particles of a rare earth hydroxycarbonate compound, heating the particles in oxygen at a limited temperature to form the corresponding trioxide particles, and heating the trioxide particles in a sulfur-containing flux in the absence of oxygen at a temperature no higher than about 900 ~C to convert the trioxide particles to the corresponding oxysulfide phosphor particles.

L'invention concerne un procédé de préparation de particules de phosphore dont la taille est inférieure ou égale à 1 micron, et dont la forme est sphérique. De telles particules de phosphore peuvent être utilisées, par exemple, comme transformateurs dans des marqueurs pour essais immunologiques. Le procédé consiste à préparer une solution diluée de sels solubles de métaux des terres rares dans des quantités requises pour obtenir le phosphore voulu, à ajouter un agent chimique qui libère des ions d'hydroxyle, à assurer la précipitation de petites particules sphériques d'un composé d'hydroxycarbonate de terres rares, à chauffer les particules dans l'oxygène à une température limitée pour former les particules de trioxyde correspondantes, et enfin, à chauffer les particules de trioxyde dans un flux à base de soufre en l'absence d'oxygène, à une tempéraure ne dépassant pas 900 ~C, pour transformer les particules de trioxyde en particules de phosphore d'oxysulfure correspondantes.

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