Effects of europium concentration on luminescent and scintillation performance of Cs0.2Rb0.8Ca1−xEuxBr3 (0 ≤ x ≤ 0.08) crystals

A series of Cs0.2Rb0.8Ca1–xEuxBr3 (0 ≤ x ≤ 0.08) crystals doped with different concentrations of Eu2+ were grown using the Bridgman-Stockbarger method. The work describes the influence of Eu2+ concentration on the luminescent and kinetic properties of Cs0.2Rb0.8Ca1–xEuxBr3 crystals, as well as on their scintillation performance. The maximum in the radioluminescence spectra of these crystals shifts from 439 to 446 nm with increasing europium concentration. The scintillation decay times of Cs0.2Rb0.8Ca1–xEuxBr3 lengthen with the Eu2+ content. The best light output of 33600 photons/MeV is obtained for Cs0.2Rb0.8Ca0.93Eu0.07Br3, and the best energy resolution of 6.9% is found for Cs0.2Rb0.8Ca0.94Eu0.06Br3. New Cs0.2Rb0.8Ca1−xEuxBr3 scintillation crystals were grown by the Bridgman-Stockbarger technique. The effect of the Eu2+ concentration on their luminescent and scintillation properties was studied. It is found that the optimal concentration of europium for Cs0.2Rb0.8Ca1−xEuxBr3 crystals is 0.06–0.07. [Display omitted] •The Cs0.2Rb0.8Ca1−xEuxBr3 series was grown with various activator concentrations.•The scintillation properties of Cs0.2Rb0.8Ca1−xEuxBr3 crystals were studied.•The highest scintillation yield is obtained for Cs0.2Rb0.8Ca0.93Eu0.07Br3 crystal.