Phosphor screen, method of producing the same, and method...

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 11/84 (2006.01) C09K 11/77 (2006.01)

Patent

CA 2216307

A phosphor powder for producing a high resolution phosphor screen and a phosphor screen are provided. The phosphor screen comprises a substrate, an infrared-absorbing layer, and a phosphor layer coated on the infrared-absorbing layer, wherein the phosphor layer comprises a phosphor powder in which a substantial amount of particles in the powder have a particle size as measured in the longest dimension of greater than 0 and less than about 5 microns. The phosphor screen may also comprise a black, infrared-absorbing substrate with the phosphor layer coated on the substrate. The phosphor powder is formed by preparing a phosphor composition, sintering the composition to form ingots, grinding the ingots to form a powder wherein a substantial amount of particles in the powder have a particle size of greater than 0 and less than about 5 microns, reactivating the powder in an inert atmosphere to a temperature of from about 500°C to about 550°C, preparing a suspension of the powder and a nonreactive organic solvent, mixing the suspension to separate particles of the powder which partially fuse during reactivation and to break up large agglomerates of the powder in the suspension, decanting the suspension to at least partially separate the nonreactive inorganic solvent and the powder, and drying the powder to form the phosphor powder.

Poudre fluorescente pour l'obtention d'un écran fluorescent haute résolution; écran ainsi obtenu. Ce dernier comprend un substrat, une couche absorbant dans l'infra-rouge et un revêtement fluorescent appliqué sur celle-ci; la couche fluorescente renferme une poudre fluorescente, dans laquelle une fraction importante de particules ont une taille de plus de 0 et de moins de 5 microns environ dans le sens de la longueur. L'écran fluorescent peut également renfermer un substrat noir, absorbant dans l'infra-rouge, et revêtu d'une couche fluorescente. La poudre fluorescente est obtenue par préparation d'une composition fluorescente, frittage de celle-ci pour former des lingots, broyage des lingots pour obtention de la poudre, dans laquelle une fraction importante de particules ont une taille de plus de 0 et de moins de 5 microns environ, réactivation de la poudre dans une atmosphère inerte à une température de 500 à 550 degrés C environ, préparation d'une suspension de la poudre et d'un solvant organique non réactif, brassage de la suspension pour séparer les particules de la poudre, qui se fusionnent partiellement lors de la réactivation, et pour décomposer les gros agglomérats de poudre dans la suspension, décantation de la suspension pour séparer au moins partiellement le solvant minéral non réactif et la poudre, et enfin séchage de la poudre pour former la poudre fluorescente.

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