2018/06/26 by Aozhen Xie, Tien Hoa Nguyen, Chathuranga Hettiarachchi +5 · 2 citations
Engineering · Materials Science · Physics and Astronomy · Chemistry · #Perovskite Materials and Applications #Solid-state spectroscopy and crystallography #Optical properties and cooling technologies in crystalline materials #Luminescence #Quenching (fluorescence) #Halide #Analytical Chemistry (journal) #Scintillator #Photoluminescence #Perovskite (structure) #Saturation (graph theory) #Single crystal #Activation energy #Crystal (programming language) #Emission spectrum #Materials science #Spectral line #Chemistry #Crystallography #Fluorescence #Physical chemistry #Inorganic chemistry #Physics #Optics
paper · doi:10.1021/acs.jpcc.8b03622
openalex publication_date 2018/06/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Temperature- and dose-dependent measurements of X-ray luminescence (XL) in various perovskite single crystals are reported. For methylammonium lead halide perovskites (MAPbX 3, MA = methylammonium, X = Cl, Br, or I), the quenching temperature of XL intensities shifts to lower temperatures in the sequence from Cl to I. This quenching is strongly affected by the decrease of the thermal activation energy Δ E q from 53 ± 3 to 6 ± 1 meV. We replace MA in MAPbBr 3 with Cs and observe that the quenching temperature even shifts to lower temperature. But unlike the MAPbX 3 perovskites, the quenching in CsPbBr 3 is now affected by the increase of the ratio between the thermal quenching rate and the radiative transition rate (Γ 0 /Γ v ) from 15 ± 1 to 66 ± 14. The same influence was observed if we dope MAPbBr 3 with Bi 3+, Γ 0 /Γ v increases to 78 ± 18 for crystal with Bi/Pb ratio of 1:10 in precursor solution. For larger dose of X-ray, we observe that the XL intensities are still linear without saturation. Unlike temperature-dependent measurements, we do not observe the line width narrowing in dose-dependent XL spectra. Thus, this scintillator is still stable with the large X-ray dose in comparison with the variation in the temperature.