Scintillation properties of LuI3:Ce3+-high light yield scintillators

The scintillation properties of LuI3:Ce3+ (Pure, 0.5%,. 2%, and 5% Ce3+), a new member of the generation of Ce3+ doped lanthanide trihalide scintillators, are presented. This material has a calculated density of 5.6 g/cm(3) and an atomic number Z(eff) of 60.2. Under optical and X-ray excitation, Ce3+ emission is observed to peak at 472 and 535 nm. A high light yield of 76000 photons per MeV (ph/MeV) was measured for LuI3:2% Ce3+. LuI3:Ce3+ has a nonexponential decay time. The contribution of short decay components (within 50 ns) to the total light yield is around 50%. An energy resolution (full-width half maximum over peak position) for the 662 keV full energy peak of 4.7 +/- 0.5% was observed for LU13:0-5% Ce3+.