Lead halide perovskite nanocrystals of the formula CsPbBr3 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 CsPbBr3 thin films on scintillating GGAG:Ce (Gd2.985Ce0.015Ga2.7Al2.3O12) 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 CsPbBr3 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 CsPbBr3 nanocrystals as efficient time taggers for ultrafast timing applications, such as TOF-PET.

Department of Dosimetry and Application of Ionizing Radiation Faculty of Nuclear Sciences and Physical Engineering Czech Technical University Prague Břehová 7 115 19 Prague Czech Republic

Department of Nuclear Chemistry Faculty of Nuclear Sciences and Physical Engineering Czech Technical University Prague Břehová 7 115 19 Prague Czech Republic

Department of Solid State Engineering Faculty of Nuclear Sciences and Physical Engineering Czech Technical University Prague Břehová 7 115 19 Prague Czech Republic

Institute of Physics of the Czech Academy of Sciences Cukrovarnická 10 162 00 Prague Czech Republic

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Ionisation of atoms determined by kappa refinement against 3D electron diffraction data