Radiation induced light output enhancement of CsPbCl3 crystal

Generally, the light output (LO) of scintillators decreases after the gamma-ray irradiation. However, the LO enhancement is observed in CsPbCl 3 crystals after gamma-rays irradiation at doses of 10 2 , 10 3 , 10 4 and 10 5  rad. A new luminescence band around 580 nm with a decay time of 12 μs is observed after the irradiation. Its intensity depends on the integrated dose of irradiation. A positive correlation between its intensity and LO is observed, illustrating the LO enhancement can be attributed to the new luminescence band. The absorption wavelength of radiation induced color centers at 2.84 eV is consistent with the excitation wavelength of the new luminescence band. There is a positive correlation between the concentration of color centers at 2.84 eV and the intensity of the new luminescence band. It indicates the new luminescence band is attributed to the luminescence of radiation induced color centers. Considering the high mobility of Cl − ions in the CsPbCl 3 crystal, it is speculated the radiation induced color centers may be vacancies of Cl − ions. The intensity of the new luminescence band decreases with time, which is attributed to the annihilation of radiation induced color centers at room temperature. The study provides valuable insights into the performance of CsPbCl 3 crystal under high irradiation. It also explains the abnormal LO enhancement in CsPbCl 3 crystals after gamma-ray irradiations, which may be useful to understand the defects of inorganic halide perovskite crystals.