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Efficient Red Organic Room-Temperature Phosphorescence Enabled by Fused-Cyclization-Induced Planarization for

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Researchers developed an efficient red organic room-temperature phosphorescence (RTP) material using fused-cyclization-induced planarization. This breakthrough enables advanced bioimaging with bright, long-lasting red light emission.

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Biomedical Imaging

Background:

  • Long-wavelength organic room-temperature phosphorescence (RTP) is valuable for time-resolved imaging due to long lifetimes and low background.
  • Efficient red RTP is difficult to achieve because of rapid nonradiative decay and low triplet-state population.

Purpose of the Study:

  • To develop a strategy for achieving highly efficient red RTP.
  • To investigate the impact of molecular rigidity on phosphorescence properties.
  • To enable advanced bioimaging applications using novel RTP materials.

Main Methods:

  • Developed a fused-cyclization-induced planarization strategy.
  • Synthesized a series of biquinoline-based guests with varying conformations.
  • Employed a host-guest doping approach for material optimization.
  • Characterized photophysical properties including phosphorescence efficiency and lifetime.

Main Results:

  • Fused-ring formation significantly enhanced molecular rigidity and suppressed nonradiative decay.
  • Achieved high phosphorescence efficiency (up to 47.53%) and long lifetime (up to 702 ms).
  • Optimized material showed bright red emission (616 nm) and excellent dispersibility.
  • Demonstrated high-contrast in vivo afterglow imaging with a signal-to-background ratio of 49.2.

Conclusions:

  • Fused-cyclization-induced planarization is an effective strategy for designing efficient long-wavelength RTP materials.
  • The developed materials show great potential for advanced bioimaging applications.
  • The study provides a new pathway for creating high-performance phosphorescent organic materials.