M. D. Birowosuto, P. Dorenbos, C. W. E. van Eijk, K. W. Krämer and H. U. Güdel
Scintillation and luminescence properties of Ce³⁺ doped ternary cesium rare-earth halides
Phys. Stat. Sol. A 204, 850-860 (2007)                 

Abstract: The scintillation properties of Ce³⁺ doped ternary cesium rare-earth halides are reported. We investigated Cs₃Lu₂I₉:Ce³⁺, Cs₃Gd₂I₉:Ce³⁺, Cs₃LaBr₆:Ce³⁺ and Cs₃LuI₆:Ce³⁺. Cs₃Lu₂I₉:Ce³⁺ and Cs₃LaBr₆:Ce³⁺ exhibit the highest light yields under g-ray excitation of 22800 ± 2300 and 10400 ± 1000 photons per MeV of absorbed g-ray energy, respectively. Optical spectroscopy and scintillation decay time curves of these compounds are presented.