Abstract
Caesium lead bromide perovskite nanocrystals (PNCs) are synthesized using a room-temperature sonochemical method. By mixing equimolar of CsBr and PbBr2 in Dimethylformamide (DMF), PNCs of CsPbBr3 structure are formed. Under an identical reaction condition, when EuBr2 is introduced with the CsBr/PbBr2 precursor, the resulted product (Eu-PNCs) becomes zero-dimensional Cs4PbBr6 nanocrystals. In addition to the typical green emission observed in both CsPbBr3 and Cs4PbBr6, Eu-PNCs has a blue emission band. The overall photoluminescence quantum yield is much higher than the pristine PNCs. We perform detailed analysis of the crystal structure and luminescence properties of the nanocrystals with and without EuBr2 modification. An X-ray absorption fine structure analysis reveals the local structure of Eu in the PNCs. We propose that the cation-solvent interaction strongly influences the crystallization process of ternary CsxPbyBrz, and the formation of Eu-solvent complexes further modifies the PNCs surface resulting in unique luminescence properties.
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