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Porphyrin-based metal-organic frameworks (MOFs) loaded with fullerene acceptors show efficient, long-lived charge separation. The framework environment dictates electron transfer and recombination pathways, crucial for optoelectronic applications.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Nanotechnology

Background:

  • Porphyrin-based metal-organic frameworks (MOFs) are promising for donor-acceptor systems.
  • Charge separation and transport are key for optoelectronic applications.

Purpose of the Study:

  • To investigate fullerene guest incorporation and photophysics in porphyrin-based MOFs.
  • To understand the role of the MOF framework in photoinduced electron transfer.

Main Methods:

  • Synthesis of PCN-222-(H2) and PCN-222-(Zn) MOFs.
  • Infiltration with C60 or PC61BM fullerenes.
  • N2 physisorption, photoluminescence quenching, UV-vis absorption, DFT calculations, and ultrafast transient absorption spectroscopy.

Main Results:

  • Successful infiltration of fullerene acceptors into MOF pores.
  • Sub-picosecond electron transfer observed with initial exciplex formation.
  • Slow charge recombination (τ ~1 ns) influenced by MOF metalation status.

Conclusions:

  • Porphyrin-MOF/fullerene systems exhibit efficient and long-lived charge separation.
  • The MOF framework environment significantly influences electron transfer and recombination pathways.
  • These findings are relevant for designing advanced donor-acceptor materials for optoelectronics.