The optical and scintillation properties of pure and Ce3+-doped Cs2LiYX6 (X = Cl,
Br) are presented. X-ray-excited optical luminescence spectra, optical excitation
and emission spectra, time-resolved excitation and emission spectra, scintillation
pulse height spectra and scintillation decay time spectra of Ce3+-doped Cs2LiYX6
(X = Cl, Br) crystals measured from 10 to 300 K are presented. Factors influencing
the scintillation mechanism and the presence of core–valence luminescence are
discussed.