Fig. 1. Structure and performance summary of CsPbBr₃ QDs. （a） Crystal structure； （b） performance radar chart of CsPbBr₃ QD and CsI（Tl） single crystal scintillators

Fig. 2. Characterization of CsPbBr₃ QD scintillators with different weight fractions. （a） Photographs； （b） TGA curves； （c） TEM image， the inset is HRTEM image

Fig. 3. Absorption efficiency of CsPbBr₃ QD scintillators with different weight fractions

Fig. 4. Performances of CsPbBr₃ QD scintillators with different weight fractions. （a） Calculated CsPbBr₃ QDs weight fraction-dependent X-ray attenuation efficiency； （b） RL spectra of scintillators， insets are the photographs of samples excited under X-ray. The dose rate is 10 mGy/s and exposure time is 5 s

Fig. 5. X-ray irradiation stabilities of two scintillators. （a） 20% CsPbBr₃ QD； （b） CsI（Tl） single crystal scintillators. Insets are the corresponding RL spectra of samples before and after X-ray irradiation

Fig. 6. TRPL spectra of CsPbBr₃ QD scintillator before and after X-ray irradiation. （a） Typical TRPL spectra； （b） statistical analysis of PL lifetime. Ten positions is chosen for each samples to decrease the random errors