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Making multi-twisted luminophores produce persistent room-temperature phosphorescence.

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Researchers developed a novel host-guest strategy to achieve persistent room-temperature phosphorescence (pRTP) in multi-twisted molecules. This breakthrough enhances phosphorescence lifetime, enabling new applications in molecular materials.

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Area of Science:

  • Supramolecular Chemistry
  • Photophysics
  • Materials Science

Background:

  • Multi-twisted molecules with multiple rotation axes are promising for molecular machines, optical materials, and sensors.
  • Achieving persistent room-temperature phosphorescence (pRTP) in these molecules is challenging due to rapid non-radiative relaxation.

Purpose of the Study:

  • To develop a strategy to enhance the phosphorescence lifetime of multi-twisted luminophores.
  • To achieve naked-eye observable persistent room-temperature phosphorescence (pRTP) in these systems.
  • To explore photoactivation for prolonging phosphorescence lifetime.

Main Methods:

  • Employed a host-guest energy-transfer relay strategy to improve phosphorescence lifetime.
  • Utilized photoexcitation-induced molecular rearrangement for further lifetime extension.
  • Investigated the stability of pRTP properties under various conditions.

Main Results:

  • Achieved a thousand-fold increase in phosphorescence lifetime for multi-twisted luminophores, enabling pRTP.
  • Demonstrated the first example of photoactivation in ordered host-guest systems to prolong phosphorescence.
  • Exhibited long-term stability (9-12 months) of pRTP properties, with high resistance to humidity and oxygen.

Conclusions:

  • The developed host-guest energy-transfer relay strategy successfully enables pRTP in challenging multi-twisted luminophores.
  • Photoactivation offers a novel route to enhance phosphorescence in ordered supramolecular systems.
  • This work advances the understanding of molecular photophysics and guides the development of new pRTP materials.