Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 17, Pages 6171-6174Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja500671h
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Funding
- NIH [UO1-CA151455, 1R01-EB016618]
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We have designed two metal organic frameworks (MOFs) to efficiently convert X-ray to visible-light luminescence. The MOFs are constructed from M-6(mu(3)-O)(4)(mu(3)-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.
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