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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Two New Red/Near-Infrared Ir(Ⅲ) Complexes with Reversible and Force-Induced Enhanced Mechanoluminescence.

Yuzhen Yang1, Qin Zeng1, Weiqiao Zhou1

  • 1Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China.

Materials (Basel, Switzerland)
|July 14, 2023
PubMed
Summary

Novel iridium(III) complexes exhibit enhanced luminescence and a blue-shift in phosphorescence when mechanically stressed. This phenomenon, induced by grinding, is attributed to altered crystalline structure and reduced triplet-triplet annihilation.

Keywords:
force-induced enhanced emissionionic iridium(III) complexesmechanoluminescencered/near-infrared phosphorescence

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Area of Science:

  • Materials Science
  • Photochemistry
  • Coordination Chemistry

Background:

  • Iridium(III) complexes are widely studied for their phosphorescent properties.
  • Mechanical force-induced changes in luminescence are of interest for sensor applications.

Purpose of the Study:

  • To design and synthesize novel red/near-infrared emitting iridium(III) complexes.
  • To investigate the effect of mechanical force on the photophysical properties of these complexes.

Main Methods:

  • Synthesis of two novel iridium(III) complexes (Ir1 and Ir2) using specific ligands.
  • Spectroscopic analysis of phosphorescence in solution and after grinding.
  • Powder X-ray diffraction (PXRD) and time-dependent density functional theory (TD-DFT) calculations.

Main Results:

  • Both complexes exhibited bright phosphorescence in the red/near-infrared region.
  • Grinding induced a significant blue-shift in phosphorescence and enhanced luminescence intensity by approximately two times.
  • PXRD and TD-DFT suggested destruction of crystalline structure and reduced triplet-triplet annihilation as mechanisms.

Conclusions:

  • The designed iridium(III) complexes display unique mechanochromic luminescence properties.
  • Mechanical force can tune the emission characteristics of these materials.
  • The findings provide insights into the mechanism of pressure-induced luminescence changes.