Abstract
We report the optical and scintillation properties of theCe3+-dopedbromoelpasolites Cs2NaREBr6 (RE = La,Y,Lu).The γ-ray scintillation light yield of these materials varies from 6000 to 17 000 photons per MeV absorbedγ-ray energy. At roomtemperature (RT), the γ-ray scintillation decay curves for all compounds show a fast component of 61 ns, whereas the intrinsicCe3+ decay time is 30 ns. The scintillation mechanism in elpasolites is addressed. InCs2NaLuBr6:Ce3+ andCs2NaYBr6:Ce3+, we observe for thefirst time the so-called Ce3+ anomalous emission in bromide compounds. This emission previously observed for chloride compounds is anultrafast Ce3+ emission with a selective excitation mechanism. The decaytime of the anomalous emission at 10 K in bromide compounds(∼7.80 ns) is faster than that in chloride compounds(∼9.90 ns). Two bands of the anomalous emission are resolved for the first time. The mechanismbehind this emission is discussed.
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