Patent ID: 6110398
Filing Date: 2000-08-29
Classification: C09K,G21K,Y10T

Abstract:
A phosphor powder, that is formable into an image receptive screen that has a very short lag time and therefore is susceptible to a very fast scanning rate, comprising a dopant accepting base comprising at least one element selected from amongst those of groups IIA to VIA of the Periodic table, about 0.0025 to 0.1 weight percent of a first dopant comprising a source of samarium, and about 0.0025 to 0.2 weight percent of a second dopant comprising a source of cerium; wherein said phosphor powder has a narrow particle size distribution and an average particle size, measured in its long dimension, of greater that 0 up to less than about 5 microns; and wherein said powder is formable into an image receptive screen that is fast scannable as a result of having low dopant proportions and having been reactivated by mild heating at a temperature of less than about 550.degree. C. after a sinter of said powder composition has been size reduced under conditions sufficient to deactivate the phosphor.