Scintillation properties of CsBa2Br5:Eu2+

In this study, the scintillation properties of Eu2+ activated CsBa2Br5 are reported. It is an analog of Eu2+ doped CsBa2I5 scintillator that exhibits excellent scintillation properties. Microcrystalline powder samples of this compound were synthesized by reaction in the molten state of cesium bromide, barium bromide and europium bromide. The concentration of an Eu was varied from 0% to 10%. The luminescence was studied under UV and X-ray excitation. The light output is strongly Eu2+ concentration dependent, reaching an estimated maximum of about 92,000 photons/MeV at 2% Eu under X-ray excitation. About 50% of the scintillation light decays in less than 1 μs. CsBa2Br5:Eu2+ exhibits a complex concentration dependent emission centered around 435 nm.