HOLE-TRAPPING SITES AND THE MECHANISM OF THE PHOTOSTIMULATED LUMINESCENCE OF THE X-RAY STORAGE PHOSPHOR RBL-TL+

Radiation damage centers generated by x irradiation at 80 and 300 K in the storage phosphor RbI:Tl+ were investigated with optically detecte d magnetic resonance and optical measurements. It is shown that the in tensity of the photostimulated luminescence depends on the concentrati on of Tl2+ centers. Bleaching into any of the seven identified Tl2+ ab sorption bands destroys the Tl2+ centers and leads to a Tl+ emission a s well as to V-K centers. Proportionally to photodestruction of Tl2+ c enters, the photostimulated luminescence is decreased. The traps for i nformation storage in RbI:Tl+ are F centers and Tl2+ centers. (C) 1996 American Institute of Physics.