| Summary: | Lead halide perovskite nanocrystals of the formula CsPbBr<sub>3</sub> have recently been identified as potential time taggers in scintillating heterostructures for time-of-flight positron emission tomography (TOF-PET) imaging thanks to their ultrafast decay kinetics. This study investigates the potential of this material experimentally. We fabricated CsPbBr<sub>3</sub> thin films on scintillating GGAG:Ce (Gd<sub>2.985</sub>Ce<sub>0.015</sub>Ga<sub>2.7</sub>Al<sub>2.3</sub>O<sub>12</sub>) wafer as a model structure for the future sampling detector geometry. We focused this study on the radioluminescence (RL) response of this composite material. We compare the results of two spin-coating methods, namely the static and the dynamic process, for the thin film preparation. We demonstrated enhanced RL intensity of both CsPbBr<sub>3</sub> and GGAG:Ce scintillating constituents of a composite material. This synergic effect arises in both the RL spectra and decays, including decays in the short time window (50 ns). Consequently, this study confirms the applicability of CsPbBr<sub>3</sub> nanocrystals as efficient time taggers for ultrafast timing applications, such as TOF-PET.
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