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Summary
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This study introduces a novel metal-free photosensitizer for enhanced triplet-triplet annihilation upconversion (TTA-UC) and single-photon absorption upconversion (SPA-UC). This breakthrough enables self-calibrating oxygen sensing in complex biological systems.

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Area of Science:

  • Photochemistry
  • Biomedical Sensing
  • Materials Science

Background:

  • Triplet-triplet annihilation upconversion (TTA-UC) is valuable for sensing by reducing autofluorescence.
  • Quantitative oxygen sensing using TTA-UC in complex systems faces limitations.

Purpose of the Study:

  • To develop a novel heavy-metal-free photosensitizer for improved TTA-UC.
  • To create an integrated platform for simultaneous TTA-UC and oxygen-resistant single-photon absorption upconversion (SPA-UC).
  • To establish a self-calibrating sensing paradigm for oxygen detection.

Main Methods:

  • Multiresonance architecture engineering was used to design a heavy-metal-free photosensitizer (BNOSe).
  • An integrated platform combining TTA-UC and SPA-UC was developed.
  • Performance was evaluated by measuring upconversion efficiency and anti-Stokes shift.

Main Results:

  • The BNOSe system achieved a record TTA-UC quantum yield of 19.3% with a 1.07 eV anti-Stokes shift.
  • Dual emissions at 617 nm (orange) and 412 nm (blue) were achieved from deep-red light excitation (640 nm).
  • The platform demonstrated simultaneous oxygen-dependent TTA-UC and oxygen-resistant SPA-UC.

Conclusions:

  • The developed metal-free photosensitizer and integrated platform overcome limitations in TTA-UC-based oxygen sensing.
  • The system offers a self-calibrating sensing paradigm with multimodal capabilities for bioimaging and analyte detection.
  • This work advances the application of upconversion techniques in complex biological and chemical environments.