Cs3Cu2I5 Perovskite Nanoparticles in Polymer Matrix as Large-Area Scintillation Screen for High-Definition X-ray Imaging

Perovskite scintillators have been widely used in X-ray detection; however, lead-based perovskite scintillators with strong self-absorption reduce the optical-coupling efficiency, significantly resulting in a relatively low optical yield. Herein, we prepared self-trapped exciton-emitting lead-free perovskite nano-particles (Cs3Cu2I5 ) using a green antisolvent method and fabricated large-scale (o = 10 cm) scintillation screens by uniformly dispersing them in a transparent styrene monomer. The antisolvent optimized the crystallization of Cs3Cu2I5 , achieving a photo-luminescence quantum yield of 87.2%. The scintillation screen prepared in the liquid phase significantly improves the luminous uniformity and led to a high spatial resolution of 7.3 lp/mm. It exhibits an excellent linear response to X-ray dose rate and a low detection limit of 63 nGyair/s. Besides, the transparent matrix enhances the stability of Cs(3)Cu(2)I(5 )with remarkable radiation-resistant hardness even under continuous X-ray irradiation for 120 min.

Automated summary

Lead-free perovskite nanoparticles capable of emitting self-trapped excitons were prepared and used to fabricate large-scale scintillation screens with high photo-luminescence quantum yield and spatial resolution. The screens showed excellent linear response to X-ray dose rate and low detection limit, as well as remarkable radiation-resistant hardness even under continuous X-ray irradiation for 120 minutes.