Luminescence and scintillation properties of Cs <sub>2</sub> ZnCl <sub>4</sub> and Cs <sub>3</sub> ZnCl <sub>5</sub>
Keisuke Takahashi, Miki Arai, Masanori Koshimizu, Yutaka Fujimoto, Takayuki Yanagida, Keisuke Asai
Abstract
Abstract Fast scintillation materials based on the ternary halide crystals of Cs 2 ZnCl 4 and Cs 3 ZnCl 5 were synthesized. Under X-ray irradiation, an emission band at 310 nm with shoulders at 260 and 410 nm was observed for Cs 2 ZnCl 4 , and emission bands at 240, 290, and 390 nm were observed for Cs 3 ZnCl 5 . The observed bands were primarily attributable to Auger-free luminescence (AFL). In the temporal scintillation profiles, scintillation decay time constants of 1.7 and 1.1 ns were found for Cs 2 ZnCl 4 and Cs 3 ZnCl 5 , respectively. These fast components are attributed to AFL and constituted greater than 88% of the total scintillation amount. On the basis of the pulse height spectra, the light yields of Cs 2 ZnCl 4 and Cs 3 ZnCl 5 were estimated to be 1280 and 440 photons MeV −1 , respectively. The light yield of the fast component of Cs 2 ZnCl 4 was slightly lower than that of BaF 2 , which is a commercially available fast scintillator exhibiting AFL.