Systematic investigation of temperature-dependence on thermal quenching of X-ray luminescence (XL) fromvarious single perovskite crystals was carried out. In the family of methylammonium lead halide perovskites(MAPbX_3, MA = methylammonium, X= Cl, Br or I), the quenching temperature of XL decreases from Cl toI. According to our analysis, such behavior is strongly affected by their corresponding decrease of thermalactivation energy ΔE_q from 53 ± 3 to 6 ± 1 meV. Different concentrations of Bi~(3+)-doped MAPbBr_3 are alsoprepared and both four-point probe measurement and X-ray thermoluminescence (TL) confirms thesuccessful doping. When we dope MAPbBr_3 with Bi~(3+), Γ_0/Γ_v increases to 78 ± 18 for crystal with Bi/Pb ratioof 1/10 in precursor solution.
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