Figure 3.

Radioluminescence (RL) characterization of as‐prepared scintillator film. a) Schematic of the testing system for RL intensity measurement. b) RL spectra of CsPbBr₃ NCs with different Ce³⁺ doping concentrations. c) RL spectra of the scintillator films prepared by spin‐coated and suction filtration methods in the same thickness. d) Light yield of CsPbBr₃ NCs with different Ce³⁺ doping concentrations. e) Radiation stability of CsPbBr₃ NCs and CsPbBr₃ with 8% Ce³⁺ doping concentration under continuous X‐ray irradiation for 1200 s and f) repeated cycles of X‐ray excitation with a time interval of 300 s. RL intensity measurements for g) undoped and h) Ce³⁺‐doped (8%) CsPbBr₃‐based scintillator films as a function of different X‐ray dose rates. i) Environmental stability of scintillator film with PS protection layer within a month. j) RL responses of the scintillator film to Beijing Sychrotron Radiation Facility (BSRF). The change of gray value along the k) y direction and l) x direction of j).