Microfluidic synthesis of high-brightness Cu2+ doped CsPbBr3 PQD and its flexible film for X-ray scintillator

Cu 2+ doped CsPbBr 3 PQDs with a PLQY of 91 % were synthesized via a continuous microfluidic approach. The precise regulation of flow rate and reaction temperature enabled fine control over the crystal size and structure. Time-resolved photoluminescence (TRPL) and transient absorption (TA) spectroscopy revealed picosecond-scale carrier recombination dynamics and distinct band-edge bleaching behavior in CsPb 0.89 Cu 0.11 Br 3 PQDs, confirming the effective defect passivation induced by Cu 2+ incorporation. Furthermore, flexible CsPb 0.89 Cu 0.11 Br 3 /PCL composite films exhibited an exceptional light yield of 21340 photons MeV −1 and a low detection limit of 82.5 nGy s −1 under X-ray excitation.