Recently,doped ternary zinc halides with high photoluminescence quantum yields(PLQYs)have demonstrated great potential in light emitting applications.However,the composition-dependent photophysical properties of terna...Recently,doped ternary zinc halides with high photoluminescence quantum yields(PLQYs)have demonstrated great potential in light emitting applications.However,the composition-dependent photophysical properties of ternary zinc halides have not been investigated,and their X-ray scintillation performances remain unexplored.Here,a compositional engineering strategy for highly efficient Cu^(+)-doped zerodimensional A_(2)ZnX_(4)(A=Rb,Cs;X=Cl,Br)blue emitters is presented.It is found that the A-site cations show a negligible influence on the emission spectra of both pure A_(2)ZnX_(4) and Cu^(+)-doped A_(2)ZnX_(4),while the change of the halide anion slightly shifts the emission peak of doped A_(2)ZnX_(4).The detailed photoluminescence(PL)studies indicate that the emission of Cu^(+)-doped A_(2)ZnX_(4) may come from two selftrapped exciton(STE)emission centers,namely Zn-related and Cu-related STEs.An energy transfer process from the Zn-related STE to the Cu-related STE is proposed.Based on the composition dependent photophysical and scintillation property study,Cu^(+)-doped Cs_(2)ZnBr_(4) is found to show the best scintillation performance among these zinc halides.Cu^(+)-doped Cs_(2)ZnBr_(4) shows a relatively high light yield of~10000 photons MeV^(-1),a low detection limit of 57 nGyair s^(-1),and good radiation stability.The X-ray imaging results based on a doped Cs_(2)ZnBr_(4) scintillation screen show a high spatial resolution of up to 9 line pairs per millimeter.These results demonstrate that the doped Cs_(2)ZnBr_(4) scintillator could be a potential candidate for sensitive X-ray detection and imaging.展开更多
基金financially supported by the Basic Science Center Program for Multiphase Evolution in Hypergravity of the National Natural Science Foundation of China(No.51988101)the National Natural Science Foundation of China(21701009,12174016)the Beijing Outstanding Young Scientists Projects(BJJWZYJH01201910005018).
文摘Recently,doped ternary zinc halides with high photoluminescence quantum yields(PLQYs)have demonstrated great potential in light emitting applications.However,the composition-dependent photophysical properties of ternary zinc halides have not been investigated,and their X-ray scintillation performances remain unexplored.Here,a compositional engineering strategy for highly efficient Cu^(+)-doped zerodimensional A_(2)ZnX_(4)(A=Rb,Cs;X=Cl,Br)blue emitters is presented.It is found that the A-site cations show a negligible influence on the emission spectra of both pure A_(2)ZnX_(4) and Cu^(+)-doped A_(2)ZnX_(4),while the change of the halide anion slightly shifts the emission peak of doped A_(2)ZnX_(4).The detailed photoluminescence(PL)studies indicate that the emission of Cu^(+)-doped A_(2)ZnX_(4) may come from two selftrapped exciton(STE)emission centers,namely Zn-related and Cu-related STEs.An energy transfer process from the Zn-related STE to the Cu-related STE is proposed.Based on the composition dependent photophysical and scintillation property study,Cu^(+)-doped Cs_(2)ZnBr_(4) is found to show the best scintillation performance among these zinc halides.Cu^(+)-doped Cs_(2)ZnBr_(4) shows a relatively high light yield of~10000 photons MeV^(-1),a low detection limit of 57 nGyair s^(-1),and good radiation stability.The X-ray imaging results based on a doped Cs_(2)ZnBr_(4) scintillation screen show a high spatial resolution of up to 9 line pairs per millimeter.These results demonstrate that the doped Cs_(2)ZnBr_(4) scintillator could be a potential candidate for sensitive X-ray detection and imaging.
