Patent ID: 6623661
Filing Date: 2003-09-23
Classification: C09K

Abstract:
A method for producing a rare earth activated, alkaline earth metal fluorohalide photostimulable phosphor which is expressed by a basic composition formula (Ba1âˆ’aMIIa)F(Br1âˆ’bIb):zLn, wherein MII is at least one alkaline earth metal selected from a group consisting of Sr and Ca; Ln is at least one rare earth element selected from a group consisting of Ce, Pr, Sm, Eu, Tb, Dy, Ho, Nd, Er, Tm, and Yb; and a, b, and z are numerical values of ranges 0&lE;a<1, 0&lE;b&lE;1, and 0calcining a precursor of the rare earth activated, alkaline earth metal fluorohalide photostimulable phosphor to obtain a calcined product; and annealing the calcined product so that the following annealing conditions are met: (1) Tmpâˆ’600Â° C.&lE;Ta&lE;Tmpâˆ’300Â° C., wherein Ta is the annealing temperature (Â° C.), and Tmp is the melting point (Â° C.) of a host crystal; and (2) 10âˆ’5&lE;NÃ—ta&lE;1, wherein ta is the processing time (in minutes), and N is the number of oxygen moles/the number of phosphor moles.