Patent ID: 6603129
Filing Date: 2003-08-05
Classification: C09K,G21K

Abstract:
A process for preparing a rare earth activated alkaline earth metal fluorohalide stimulable phosphor particles represented by the following formula (1) in a liquid process:Ba(1-x)M2xFX:yM1, zLnâ€ƒâ€ƒformula (1) wherein M2 is at least an alkaline earth metal selected from the group consisting of Mg, Ca, Sr, Zn and Cd; M1 is at least an alkali metal selected from the group consisting of Li, Na, K, Rb and Cs; X is at least a halogen atom selected from the group consisting of Cl, Br and I; Ln is at least a rare earth element selected from the group consisting of Ce, Pr, Sm, Eu, Gd, Tb, Tm, Dy, Ho, Nd, Er and Yb; and x, y and z are numbers within the range of 0&lE;x&lE;0.6, 0&lE;y&lE;0.05 and 0the process comprising: (a) preparing particles of a precursor of the stimulable phosphor, (b) covering the particles of the precursor with fine particles of at least two kinds of metal oxides, and then (c) subjecting the particles of the precursor to calcination to obtain stimulable phosphor particles.