Seed‐Crystal‐Induced Cold Sintering Toward Metal Halide Transparent Ceramic Scintillators

Abstract Scintillators with high spatial resolution at a low radiation dose rate are desirable for X‐ray medical imaging. To challenge the state‐of‐art technology, it is necessary to design large‐area wafers with high light yield, oriented light transport, and reduced light scattering. Here, a seed‐crystal‐induced cold sintering is adopted and a <001>‐textured TPP 2 MnBr 4 (TPP: tetraphenylphosphonium) transparent ceramic is fabricated with a large‐area wafer of 5 cm in diameter, exhibiting high optical transparency of above 68% over the 450–600 nm range. The compelling scintillation performance of the TPP 2 MnBr 4 wafer includes a light yield of ≈78 000 ± 2000 photons per MeV, a low detection limit 8.8…