Chiral defect-induced strategy is employed to synthesize zero-dimensional(0D)chiral Cs_(4)PbBr_(6) perovskite nanocrystals(NCs)with blue photoluminescence via a phase transition process.The chirality of the ground sta...Chiral defect-induced strategy is employed to synthesize zero-dimensional(0D)chiral Cs_(4)PbBr_(6) perovskite nanocrystals(NCs)with blue photoluminescence via a phase transition process.The chirality of the ground state of chiral Cs_(4)PbBr_(6) perovskite NCs is confirmed by circular dichroism(CD)spectra,which shows the characteristic mirrored CD signals,behaving as a pair of enantiomers.Meanwhile,the obvious circularly polarized luminescence(CPL)response indicates that the chiral Cs_(4)PbBr_(6) perovskite NCs are endowed with the chirality of the excited state.Furthermore,the UV–vis spectroscopy and electron paramagnetic resonance(EPR)data explicitly reveal that the CPL response originates from the chiral bromine vacancy(VBr).This work not only provides guidance to realize the CPL of 0D chiral perovskites but also gives insights into the structure–property relationship.展开更多
基金supported by the National Natural Science Foundation of China Natural(no.21771083).
文摘Chiral defect-induced strategy is employed to synthesize zero-dimensional(0D)chiral Cs_(4)PbBr_(6) perovskite nanocrystals(NCs)with blue photoluminescence via a phase transition process.The chirality of the ground state of chiral Cs_(4)PbBr_(6) perovskite NCs is confirmed by circular dichroism(CD)spectra,which shows the characteristic mirrored CD signals,behaving as a pair of enantiomers.Meanwhile,the obvious circularly polarized luminescence(CPL)response indicates that the chiral Cs_(4)PbBr_(6) perovskite NCs are endowed with the chirality of the excited state.Furthermore,the UV–vis spectroscopy and electron paramagnetic resonance(EPR)data explicitly reveal that the CPL response originates from the chiral bromine vacancy(VBr).This work not only provides guidance to realize the CPL of 0D chiral perovskites but also gives insights into the structure–property relationship.
