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Lanthanide-Sensitized Upconversion Iridium Complex via Triplet Energy Transfer.

Kui Xu1, Lifeng Zheng2, Song-Song Bao1

  • 1State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210023, China.

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Summary

Researchers developed a new method to achieve upconversion luminescence in iridium (Ir) complexes using lanthanide-doped upconversion nanoparticles (UCNPs). This strategy enables Ir complexes to emit light under near-infrared excitation, overcoming previous limitations.

Keywords:
energy transferluminescencenanoparticlesrare earthsupconversion

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Area of Science:

  • Materials Science
  • Photochemistry
  • Nanotechnology

Background:

  • Cyclometalated iridium (Ir) complexes possess tunable optical properties valuable for biology and photocatalysis.
  • Achieving upconversion luminescence in Ir complexes under near-infrared (NIR) light excitation remains a significant challenge.

Purpose of the Study:

  • To develop a novel strategy for sensitizing upconversion luminescence in Ir complexes using lanthanide-doped upconversion nanoparticles (UCNPs).
  • To investigate the mechanism of triplet energy transfer for enhanced luminescence.

Main Methods:

  • Fabrication of core-shell structured NaYbF4:Tb@NaTbF4 UCNPs.
  • Synthesis of new iridium phosphonate complexes.
  • Utilizing Tb3+-mediated energy migration within UCNPs to sensitize Ir complex luminescence upon 980 nm excitation.
  • Experimental and theoretical investigations of energy transfer pathways.

Main Results:

  • Demonstrated successful sensitization of upconversion luminescence in Ir complexes via UCNPs.
  • Identified triplet energy transfer from excited Tb3+ ions to the Ir complex triplet state as the key sensitization mechanism.
  • Confirmed energy migration to the nanoparticle surface for efficient sensitization.

Conclusions:

  • The developed hybrid UCNP-Ir complex system effectively achieves upconversion luminescence under NIR excitation.
  • Triplet energy transfer is crucial for sensitizing Ir complex luminescence in this hybrid system.
  • This work offers new possibilities for advanced hybrid Ir materials and UCNP-based nanomaterials.