Effects Of Na+ , Mg2+ , Ca2+ , Sr2+ And Ba2+ Doping On The Scintillation Properties Of Cebr3

The effects of Na+, Mg2+, Ca2+, Sr2+ and Ba2+ doping on the scintillation properties of CeBr3 are evaluated in this paper. Ca2+ and Sr2+ doped CeBr3 show different scintillation properties as compared to undoped CeBr3, i.e. an additional perturbed Ce3+ site with emission maxima red-shifted by 30 nm compared to unperturbed Ce3+ sites as evidenced by X- ray excited emission and photoluminescence measurements. Also a nearly constant light yield at temperatures below 300 K, an increased decay time and the appearance of multiple glow peaks in thermoluminescence measurements are observed for Ca2+ and Sr2+ doped CeBr3. These effects on the scintillation properties of CeBr3 are explained using a single trap model where Br vacancies, formed as charge compensation for the aliovalent dopants, act as electron traps.