Photoluminescence and Scintillation Properties of Rb2CeCl5 Crystal

A new Rb 2 CeCl 5 -based crystalline scintillator was grown by the vertical Bridgman-Stockbarger method for application in X-ray and gamma-ray detection.In the X-ray diffraction (XRD) analysis, most peaks of the grown crystal were in good agreement with the database of Rb 2 CeCl 5 , whereas a few peaks of Rb 3 CeCl 6 were also identified.The photoluminescence and scintillation properties of a Rb 2 CeCl 5 crystal were studied under excitation by UV light, X-rays, and γ-rays.The photoluminescence and scintillation spectra showed an emission band peak at 370 nm, with a shoulder at around 350 nm, which was assigned to the 5d 1 -4f ( 2 F 5/2 , 2 F 7/2 ) allowed transitions of Ce 3+ .The calculated scintillation decay time constants were approximately 24 and 153 ns.The scintillation light yield reached 36000 photons/MeV with an energy resolution of 15% at 662 keV.