PHOTOSTIMULATED LUMINESCENCE OF BAFBR-EU2+ PHOSPHORS

After x-irradiation for 10 s, luminescence from BaFBr:Eu2+ phosphors b y photostimulation of longer wavelength than F absorption bands was ob served and assigned to the surface states or intrinsic defects of the powders. It is found that the luminescence by photostimulation into F bands can be reduced via electron migration from F centers into the su rface states or intrinsic defects, thus reducing the x-ray storage or image stability. Surface passivation can lower these defects and impro ve the phosphors or imaging plate quality. (C) 1996 American Institute of Physics.