Scintillation properties of crystals based on ternary bromides of calcium and alkali metals activated with europium

Abstract

Single crystals of new scintillation materials ACaBr 3 :Eu 2+ (A = K, Rb) were grown using the Bridgman-Stockbarger method. The luminescence spectra of RbCa 1-x Eu x Br 3 crystals include a single band with a maximum which position shifts from 433 to 443 nm with the increase of mole fraction of Eu 2+ from 0.005 to 0.08. The decay of the scintillation pulse can be described using single component and the decay time rises towards concentration of Eu 2+ in crystals from 2.70 μs (x = 0.03) to 3.14 μs (x = 0.05). The relative light yield achieves 77 per cent vs. NaI:Tl for RbCa 0.92 Eu 0.08 Cl 3 sample and the energy resolution is 8.2%. Comparing with the K-based analogs RbCa 1-x Eu x Br 3 materials are more stable and they are considerably brighter scintillators than CsCa 1-x Eu x Br 3 .

Computational Screening of Promising Deep-Ultraviolet Light Emitters

“…To ensure that the 6 candidates identified are dynamically stable and are viable to be experimentally synthesized, we also calculate their phonon spectra at room temperature and the absence of imaginary phonon modes demonstrates their dynamical stability (see the phonon spectra in Figure S20 in the Supporting Information). By carefully checking the existing literature, we find that Mg 3 NF 3 , KCaBr 3 , KHS, , and RbHS , have all been successfully synthesized in experiments, further confirming the promises of these materials. BeGeN 2 has been reported before, but its experimental synthesis still requires future attempts.…”