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Updated: Dec 28, 2025

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Ultrastable atomically precise chiral silver clusters with more than 95% quantum efficiency.

Zhen Han1, Xi-Yan Dong1,2, Peng Luo1

  • 1College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, China.

Science Advances
|February 22, 2020
PubMed
Summary
This summary is machine-generated.

Atomically precise silver clusters now show high photoluminescence quantum yield (PLQY) and stability. This breakthrough enables strong circularly polarized luminescence, paving the way for advanced optical applications.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Photochemistry

Background:

  • Monolayer-protected silver clusters typically have low photoluminescence quantum yield (PLQY) and are unstable in ambient conditions.
  • The chiroptical properties of these silver clusters are not well-developed.

Purpose of the Study:

  • To synthesize enantiomers of an octahedral Ag6 cluster with enhanced photoluminescence and chiroptical activity.
  • To investigate the mechanism behind the high PLQY and circularly polarized luminescence.

Main Methods:

  • One-step synthesis of Ag6 clusters using designed chiral ligands at ambient temperature.
  • Characterization using atomically precise structural determination, photophysical measurements, and computational analysis.
  • Evaluation of photoluminescence quantum yield (PLQY) and thermal stability.

Main Results:

  • Achieved a highest PLQY of >95.0% at 300 K.
  • Clusters demonstrated structural integrity and stable emission up to 150°C in air.
  • Observed thermally activated delayed fluorescence, leading to high PLQY and strong circularly polarized luminescence due to excited-state chirality.

Conclusions:

  • Developed stable, highly luminescent chiral silver clusters with unprecedented PLQY.
  • Thermally activated delayed fluorescence is key to achieving high PLQY and circularly polarized luminescence in these systems.
  • These findings open new avenues for silver clusters in luminescence and optical applications.