Patent ID: 7655926

Claim:
A rare earth activated alkaline earth metal fluorohalide stimulable phosphor represented by the following Formula (1), wherein a spectral width at an intensity of 80% to the maximum intensity of an instantaneous excitation spectrum is 23.0 nm or less, Ba (1-x) M 2 (x) FBr (y) I (1-y) :aM 1 , bLn, cO Formula (1) wherein M 1 is at least an alkali metal selected from the group consisting of Li, Na, K, Rb and Cs; M 2 is at least an alkaline earth metal selected from the group consisting of Be, Mg, Sr and Ca; 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, a, b and c are values meeting the following conditions: 0≦x≦0.3, 0≦y≦0.9, 0≦a≦0.05 0<b≦0.2 and 0≦c≦0.1, respectively.