Abstract
The impact of introducing heterovalent Bi3+ impurities in APbX3 [A = CH3NH3, CH(NH2)2; X = I, Br] lead halide perovskite single crystals is investigated by means of photoluminescence (PL) spectroscopy. The element analysis reveals that Bi3+ ions are more easily incorporated into CH3NH3PbI3 than into the bromide perovskites CH(NH2)2PbBr3 and CH3NH3PbBr3. The three different halide perovskite single crystals used in this study exhibit a blueshift of the PL spectra at room temperature upon increasing the Bi3+ concentration. This blueshift is attributed to the weaker photon recycling effect that is induced by shorter PL lifetimes. The experiments reveal that the room‐temperature PL spectra of CH(NH2)2PbBr3 and CH3NH3PbI3 are relatively insensitive to impurity doping when compared to the PL spectrum obtained from CH3NH3PbBr3. On the other hand, doping with Bi3+ affects the low‐temperature PL properties of each sample in a different way, that is, its effect depends on the types of ions in the host material. The mechanism responsible for the shift of the PL spectra and the role of Bi3+ in lead halide perovskites are discussed.
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