Properties of optically and thermally stimulated luminescence of novel storage phosphor materials: Doped and undoped CsCaCl₃ ceramics

Abstract

We report the properties of CsCaCl 3 , storage phosphors doped with Eu, Ce, or Cu. Both doped and undoped CsCaCl 3 samples were synthesized as ceramics. For undoped CsCaCl 3 , thermally stimulated luminescence (TSL) spectrum showed a broad band around 360390 nm, and optically stimulated luminescence (OSL) spectrum exhibited the same band with a shoulder near 320 nm. These bands were attributed to different kinds of defects or impurities. The OSL and TSL spectra of Eu-doped CsCaCl 3 showed a band around 440 nm arising from the 5d4f transition of Eu 2+. The Ce-doped CsCaCl 3 showed the OSL and TSL bands originating from the 5d4f transition of Ce 3+ . An intense band at 345 nm appeared in the OSL spectrum of Cu-doped CsCaCl 3 due to Cu + , and an additional peak at 430 nm was ascribed to Cu + ion perturbed by OH ¹ ion. On the other hand, the TSL spectrum of Cu-doped CsCaCl 3 had a peak around 470 nm and it was assigned to Cu 2+ . The TSL glow curves of the undoped, Eudoped, Ce-doped, and Cu-doped CsCaCl 3 were different from each other. This suggested that the dopant ions influenced the trapping process of electronhole pairs, which were formed upon irradiation.