Luminescence and scintillation properties of Tl- and Ce-doped Cs2HfCl6 crystals

The luminescence and scintillation properties of Tl-and Ce-doped Cs2HfCl6 crystals were investigated by photoluminescence and radioluminescence spectroscopy. In the photoluminescence spectra, emission bands of the activators were observed at 500nm for Tl-doped Cs2HfCl6, and at 340 and 380nm for Ce-doped Cs2HfCl6. The radioluminescence bands were observed at 405 and 430nm for Tl-and Ce-doped Cs2HfCl6, respectively. Scintillation decay time constants for the Tl-and Ce-doped Cs2HfCl6 were smaller than those for the corresponding undoped crystals. Scintillation light yields for Tl-and Ce-doped Cs2HfCl6 were estimated to be 23,700 and 15,700 photons/MeV, respectively. (C) 2017 The Japan Society of Applied Physics