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The photostimulation process in the X-ray storage phosphor KBr:In
Uldis Rogulis (Institute of Solid State Physics, UL, University of Latvia), Ivars Tale (Institute of Solid State Physics, UL, University of Latvia), Th. Hangleiter (Institute of Solid State Physics, UL, University of Latvia), J. Martin Spaeth (Institute of Solid State Physics, UL, University of Latvia)
Abstract: The nature of the radiation damage centres generated by X-irradiation at 300 K, 100 K and 10 K and the photostimulation process are investigated in KBr:In. Measurements of the optical absorption, the magnetic circular dichroism of the optical absorption (MCDA) and the MCDA-detected electron paramagnetic resonance, as well as of the photostimulated In + emission, are utilized. At room temperature, F centres, In 2+ centres and In 0 (1) centres are generated. In 2+ centres are not produced at low temperature and therefore are not primary hole defects. It is shown that the photostimulation process does not occur within F-In 2+ centre pairs, as previously proposed. It involves an aggregate between F centres, In + centres and an unknown, room-temperature-stable hole centre. The photostimulation process, including replenishment effects, seems very similar to the one found earlier for the well known X-ray storage phosphor BaFBr:Eu 2+ .