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Excited-Multimer Mediated Supramolecular Upconversion on Multicomponent Lanthanide-Organic Assemblies.

Xiao-Fang Duan1,2, Li-Peng Zhou1, Hao-Ran Li1

  • 1State Key Laboratory of Structural Chemistry, CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China.

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|October 16, 2023
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Summary
This summary is machine-generated.

Researchers developed novel lanthanide-organic complexes exhibiting unique upconversion (UC) properties. This new strategy enables tunable UC materials by utilizing excited-multimer states for enhanced photofunctions.

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Area of Science:

  • Materials Science
  • Optics
  • Chemistry

Background:

  • Upconversion (UC) is an anti-Stokes optical process with broad applications.
  • Existing UC mechanisms, often based on direct energy transfer between metal ions, limit material design and tunability.

Purpose of the Study:

  • To synthesize novel lanthanide-organic complexes utilizing assembly-induced excited-multimer states.
  • To demonstrate a new strategy for designing tunable UC materials.

Main Methods:

  • Synthesis of two types of Ln8L12-type lanthanide-organic complexes.
  • Characterization of upconverted fluorescence under 980 nm excitation.
  • Investigation of cooperative sensitization and excited-multimer mediated energy relay mechanisms.

Main Results:

  • Yb8(L2R/S)12 assembly showed upconverted multimer green fluorescence via cooperative sensitization.
  • Heterometallic (Yb/Eu)8L12 assemblies achieved upconverted red emission through excited-multimer mediated energy relay.

Conclusions:

  • Assembly induced excited-multimer states offer a new pathway for UC material design.
  • This approach enhances the designability and tunability of multicomponent lanthanide-organic complexes for advanced photofunctions.