This study presents new hybrid Eu(II)-bromide scintillators with efficient 5d-4f bandgap transitions for X-ray imaging. The 1D type [Et4N]EuBr3-MeOH and 0D type [Me4N]6Eu5Br16:MeOH scintillators exhibit spin-allowed 5d-4f bandgap transitions, which facilitate efficient carrier transport during scintillation. The 1D/0D structures with edge/face-sharing [EuBr6]4- octahedra contribute to lower bandgaps and enhanced quantum confinement effects, enabling efficient scintillation performance with a light yield of ~73100 ± 800 Ph MeV-1, a detection limit of ~18.6 nGy s-1, and an X-ray afterglow of ~1% at 9.6 μs. The scintillators were embedded into AAO films to achieve an X-ray imaging resolution of 27.3 lp mm-1. These results demonstrate the potential of low-dimensional rare-earth-based halides for scintillation and optoelectronic applications. The study highlights the importance of designing scintillators with efficient radioluminescence through heavy atoms, few defects, and low energy level D-values between the conduction band (CB) and valence band (VB) and luminescence centers (LCs). The efficient scintillation performance is attributed to the 4f-5d bandgap emission, low bandgaps, and enhanced quantum confinement effect. The scintillators show high thermal stability and low detection limits, making them suitable for X-ray imaging applications. The study also demonstrates the potential of solution-processed scintillation screens for X-ray imaging with high spatial resolution and low X-ray afterglow. The findings provide valuable insights for developing next-generation high-performance scintillation materials.This study presents new hybrid Eu(II)-bromide scintillators with efficient 5d-4f bandgap transitions for X-ray imaging. The 1D type [Et4N]EuBr3-MeOH and 0D type [Me4N]6Eu5Br16:MeOH scintillators exhibit spin-allowed 5d-4f bandgap transitions, which facilitate efficient carrier transport during scintillation. The 1D/0D structures with edge/face-sharing [EuBr6]4- octahedra contribute to lower bandgaps and enhanced quantum confinement effects, enabling efficient scintillation performance with a light yield of ~73100 ± 800 Ph MeV-1, a detection limit of ~18.6 nGy s-1, and an X-ray afterglow of ~1% at 9.6 μs. The scintillators were embedded into AAO films to achieve an X-ray imaging resolution of 27.3 lp mm-1. These results demonstrate the potential of low-dimensional rare-earth-based halides for scintillation and optoelectronic applications. The study highlights the importance of designing scintillators with efficient radioluminescence through heavy atoms, few defects, and low energy level D-values between the conduction band (CB) and valence band (VB) and luminescence centers (LCs). The efficient scintillation performance is attributed to the 4f-5d bandgap emission, low bandgaps, and enhanced quantum confinement effect. The scintillators show high thermal stability and low detection limits, making them suitable for X-ray imaging applications. The study also demonstrates the potential of solution-processed scintillation screens for X-ray imaging with high spatial resolution and low X-ray afterglow. The findings provide valuable insights for developing next-generation high-performance scintillation materials.