Charge transfer transitions in the excitation spectra of PrX3:Ce3+ (X=Cl, Br) scintillators

The Cl−→Pr3+ charge transfer transition is identified to occur in the excitation spectrum of PrCl3:Ce3+ at 211 nm (47,393 cm−1). A model based on the dissociation of the charge transfer state is proposed to explain the presence of the ligand-to-Pr3+ charge transfer transition band in the excitation spectrum of PrX3:Ce3+ (X=Cl, Br) when the Ce3+ emission is monitored.