X-Ray Luminescence in Undoped and Bismuth-doped Single Crystal Hybrid Lead Halide Perovskites

Systematic investigation of temperature-dependence on thermal quenching of X-ray luminescence (XL) from various 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 to I. According to our analysis, such behavior is strongly affected by their corresponding decrease of thermal activation energy Delta E-q from 53 +/- 3 to 6 +/- 1 meV. Different concentrations of Bi3+-doped MAPbBr3 are also prepared and both four-point probe measurement and X-ray thermoluminescence (TL) confirms the successful doping. When we dope MAPbBr3 with Bi3+, Gamma(0)/Gamma(v) increases to 78 +/- 18 for crystal with Bi/Pb ratio of 1/10 in precursor solution [1].