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Bodipy Dimer for Enhancing Triplet-Triplet Annihilation Upconversion Performance.

Min Gao1, Le Zeng2, Linhan Jiang2

  • 1Jiangxi Key Laboratory for Microscale Interdisciplinary Study, Institute for Advanced Study, Nanchang University, Nanchang 330031, China.

Molecules (Basel, Switzerland)
|July 29, 2023
PubMed
Summary

Researchers developed a new Bodipy dimer for enhanced triplet-triplet annihilation upconversion (TTA-UC). This strategy improves upconversion efficiency, benefiting applications in photonics and bioimaging.

Keywords:
Stokes shiftboron-dipyrromethenefluorescence quantum yieldtriplet-triplet annihilation upconversionupconversion quantum efficiency

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Area of Science:

  • Photochemistry and Photophysics
  • Materials Science
  • Organic Chemistry

Background:

  • Triplet-triplet annihilation upconversion (TTA-UC) is crucial for applications like bioimaging and solar energy.
  • Bodipy dyes are common TTA-UC annihilators but suffer from low efficiency due to internal filtration effects caused by small Stokes shifts.
  • Conventional Bodipy dyes exhibit limited Stokes shifts (<20 nm), hindering optimal performance in TTA-UC systems.

Purpose of the Study:

  • To synthesize a Bodipy dimer with enhanced Stokes shifts for improved TTA-UC performance.
  • To investigate the potential of the new Bodipy dimer as an annihilator in TTA-UC systems.
  • To propose a novel strategy for expanding Bodipy Stokes shifts and boosting TTA-UC efficiency.

Main Methods:

  • Synthesis of a Bodipy dimer (B-2) via dimerization of a known Bodipy annihilator (B-1).
  • Photophysical characterization of the synthesized Bodipy dimer and its parent compound.
  • Coupling of Bodipy derivatives with a red light-activated photosensitizer (PdTPBP) for TTA-UC experiments.
  • Theoretical chemical analysis to understand structure-property relationships.

Main Results:

  • Successful synthesis of a Bodipy dimer (B-2) exhibiting significantly larger Stokes shifts compared to B-1.
  • Both B-1 and B-2 effectively coupled with PdTPBP for TTA-UC.
  • The PdTPBP/B-2 system achieved a higher upconversion efficiency (10.7%) than the PdTPBP/B-1 system (4.0%) due to B-2's higher fluorescence quantum yield.
  • Demonstrated improved TTA-UC performance using the dimerized Bodipy annihilator.

Conclusions:

  • Dimerization of Bodipy annihilators is an effective strategy to increase Stokes shifts and enhance TTA-UC performance.
  • The synthesized Bodipy dimer (B-2) offers superior upconversion efficiency compared to the monomeric form (B-1).
  • This approach provides a pathway for developing advanced TTA-UC materials for photonics and biophotonics.