Reply to the ‘Comment on “Photodetection and scintillation characterizations of novel lead-bismuth double perovskite halides”’ by L. Xiao, J. Guo, G. Tang and Z. Xiao, J. Mater. Chem. C , 2025,

In this Reply we show that Cs ₄ PbBi ₂ X ₁₂ (X = Br, I) is a distinct dominant phase, not Cs ₃ Bi ₂ X ₉ + CsPbX ₃ , supported by XRD/Rietveld, bandgaps/PL, and SEM/EDS. Residual mismatches arise from kinetics, texture/minor phases, and EDS bias.