A novel high concentration doping method based on the transformation from CsPbBr nanocrystals (NCs), which reacted with divalent metal bromide MBr, to CsPbMBr NCs was developed. Two types of M and Zn which cannot emit light and Mn and Eu which can be used as the luminous centres, were chosen to trigger the transformation of CsPbBr NCs to CsPbMBr NCs. CsPbZnBr NCs maintained high photoluminescence quantum yields (PLQY) (>75%) and had good dispersion in hexane without obvious dissolution or agglomeration after two weeks. By adjusting the reaction temperature, the intrinsic band edge luminescence and the emission of Mn ions CsPbMnBr NCs show different colours of light from green, green-yellow, pink, and orange-red to purple under an excitation of 365 nm. CsPbEuBr NCs were synthesized for the first time, and a weak luminescence around 618 nm from Eu was detected in addition to the band edge luminescence of NCs. X-ray photoelectron spectroscopy (XPS) data showed that Zn, Mn and Eu (Eu) doping concentrations are up to 80%, 75% and 50%, respectively. We also analysed the doping mechanism and compared the new method with the traditional high temperature injection method. The lead-depleted perovskite NCs transformed from CsPbBr can provide a feasible pathway to reduce the lead toxicity of perovskite NCs and expand their applications.
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