Rare earth phosphors and phosphor screens

Details Rare earth phosphors and phosphor screens Rare earth phosphors and phosphor screens

C - Chemistry, Metallurgy

09

K

31/124

C09K 11/77 (2006.01)

Patent

CA 1098302

ABSTRACT OF THE DISCLOSURE This invention relates to rare earth phosphor screens for convert- ing image carrying incident radiation to image carrying visible or near- visible radiation and to the rare earth phosphor materials utilized in such screens. The invention further relates to methods for converting image carrying charged particles to image carrying radiation principally in the blue and near-ultraviolet region of the spectrum and to stabilized rare earth phosphors characterized by having a continuous surface layer of the phosphors of the invention. More particularly, the phosphors of the invention are oxychlorides and oxybromides of yttrium, lanthanum and gadolinium activated with trivalent cerium and the conversion screens are of the type illustra- tively including x-ray conversion screens, image amplifier tube screens, neutron imaging screens, cathode ray tube screens, high energy gamma ray screens, scintillation detector screens and screens for real-time translation of image carrying high energy radiation to image carrying visible or near- visible radiation.

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