Evaluation of Scintillation and Thermally Stimulated Luminescence Properties of Cs2CdCl4 Single Crystals

The optical and scintillation properties of undoped, Sb-doped, and Tl-doped Cs 2 CdCl 4 single crystals were investigated.We chose Sb 3+ and Tl + as the dopants of (ns) 2 -type electronic configurations.In the photoluminescence and scintillation spectra of undoped Cs 2 CdCl 4 , three emission peaks were observed.The scintillation decay-time constants were small (1.2 and 13 ns) and light yields were low (several tens of photons/MeV).In contrast, Sb 3+ -and Tl + -doped Cs 2 CdCl 4 showed s-p transitions of the dopant ions, and the light yield was larger than that of undoped Cs 2 CdCl 4 (625 and 1000 photons/MeV, respectively).Tl-doped Cs 2 CdCl 4 showed relatively large scintillation decay-time constants (270 ns) because of slow energy transfer from the host to Tl + .On the other hand, Sb-doped Cs 2 CdCl 4 showed significant afterglow behavior and three thermally stimulated luminescence (TSL) glow peaks (93, 168, and 238 ℃) with good linearity with respect to the X-ray dose.In conclusion, the light yield of undoped Cs 2 CdCl 4 can be enhanced by doping with Sb 3+ and Tl + ; TSL characteristics are achieved by doping Sb 3+ .