Scintillation Properties of KCu2I3·CH3SOCH3 and RbCu2I3·CH3SOCH3 Single Crystals

KCu 2 I 3 •DMSO (K sample, DMSO: dimethyl sulfoxide) and RbCu 2 I 3 •DMSO (Rb sample) single crystals were fabricated by the solvent diffusion method.The K and Rb samples exhibited a broad emission band peaking at 550 and 530 nm, respectively, in the photoluminescence (PL) spectra.The PL quantum yield values under 450 nm excitation were 26 and 55% for the K and Rb samples, and the decay time constants were calculated to be 1.96 and 1.93 μs, respectively.These emissions were attributed to the cluster-centered charge transfer transitions.The X-rayinduced radioluminescence spectra were almost consistent with the PL spectra; thus, the emissions can be assigned to the same origin.The light yields of the K and Rb samples were estimated to be approximately 2800 and 2600 photons/MeV under γ-ray exposure, respectively.