Fabrication of Highly Stable Cs3Cu2I5-in-Glass Composite for X-Ray Imaging by SPS Technique

The development of all-inorganic lead-free Cs 3 Cu 2 I 5 perovskite materials has garnered significant attention due to their non-toxic nature and unique optoelectronic properties, particularly in the field of X-ray detection. However, the stability of perovskites remains a major concern for their optical applications. In this study, a highly stable Cs 3 Cu 2 I 5 -in-glass composite (Cs 3 Cu 2 I 5 @Borosilicate) is fabricated by spark plasma sintering (SPS), a rapid and low-temperature sintering process. The Cs 3 Cu 2 I 5 @Borosilicate composite exhibits strong photoluminescence even after prolonged immersion in various polar solvents, whereas Cs 3 Cu 2 I 5 perovskite loses its photoluminescence within seconds. Moreover, the Cs 3 Cu 2 I 5 @Borosilicate composite demonstrates robust radio-luminescence under X-ray irradiation, and its potential as a scintillator material is validated through prototype X-ray imaging with a high spatial resolution (≈7 lp mm −1 ). This innovative composite material holds immense potential for scintillation applications and represents a promising approach for encapsulating perovskites in a transparent amorphous medium.