title: Synergistic assembly of heavy metal clusters and luminescent organic bridging ligands in metal-organic frameworks for highly efficient X-ray scintillation.
abstract: We have designed two metal-organic frameworks (MOFs) to efficiently convert X-ray to visible-light luminescence. The MOFs are constructed from M6(μ3-O)4(μ3-OH)4(carboxylate)12 (M = Hf or Zr) secondary building units (SBUs) and anthracene-based dicarboxylate bridging ligands. The high atomic number of Zr and Hf in the SBUs serves as effective X-ray antenna by absorbing X-ray photons and converting them to fast electrons through the photoelectric effect. The generated electrons then excite multiple anthracene-based emitters in the MOF through inelastic scattering, leading to efficient generation of detectable photons in the visible spectrum. The MOF materials thus serve as efficient X-ray scintillators via synergistic X-ray absorption by the metal-cluster SBUs and optical emission by the bridging ligands.
authors.affiliation: Department of Chemistry, University of Chicago , 929 E 57th St, Chicago, Illinois 60637, United States.
authors.forename: Cheng
authors.initials: C
authors.lastname: Wang
authors.forename: Olga
authors.initials: O
authors.lastname: Volotskova
authors.forename: Kuangda
authors.initials: K
authors.lastname: Lu
authors.forename: Moiz
authors.initials: M
authors.lastname: Ahmad
authors.forename: Conroy
authors.initials: C
authors.lastname: Sun
authors.forename: Lei
authors.initials: L
authors.lastname: Xing
authors.forename: Wenbin
authors.initials: W
authors.lastname: Lin
mesh_terms: D008024:Ligands; D008027:Light; D049449:Luminescence; D049408:Luminescent Agents / Q000737:chemistry*; D019216:Metals, Heavy / Q000737:chemistry*; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000737:chemistry*; D012588:Scintillation Counting / Q000379:methods*; D013050:Spectrometry, Fluorescence / Q000379:methods; D014965:X-Rays
chemical_list: D008024:Ligands; D049408:Luminescent Agents; D019216:Metals, Heavy; D009942:Organometallic Compounds
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