Scintillation properties of Eu2+-activated CsCaCl3−xBrx (x=1, 1.5, 2)

Crystals of CsCa0.95Eu0.05Cl3−xBrx compositions (namely, CsCa0.95Eu0.05ClBr2, CsCa0.95Eu0.05Cl1.5Br1.5 and CsCa0.95Eu0.05Cl2Br) were grown by the vertical Bridgman-Stockbarger method. Their radioluminescence spectra contain a narrow band, which can be attributed to the 5d-4f transition in Eu2+. The decay times are 1.49 μs for CsCa0.95Eu0.05ClBr2, 4.79 μs for CsCa0.95Eu0.05Cl1.5Br1.5 and 4.1 μs for CsCa0.95Eu0.05Cl2Br. The highest light yield is 37,000 ph/MeV in CsCa0.95Eu0.05ClBr2 with an energy resolution of 14.1% at 662 keV. The photoluminescence emission and excitation spectra of the obtained materials were recorded. The moisture sensitivity of the new scintillation materials has been estimated.