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Circularly polarized luminescence in chiral silver nanoclusters
Jatish Kumar1, Tsuyoshi Kawai1, Takuya Nakashima1
1Graduate School of Materials Science, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan. ntaku@ms.naist.jp tkawai@ms.naist.jp.
Chemical Communications (Cambridge, England)
|January 10, 2017
Summary
Chiral silver nanoclusters (NCs) display opposite circularly polarized luminescence (CPL) due to their ligand structure. This chirality in the ligand influences the optical activity of the silver nanoclusters.
Area of Science:
- Nanomaterials Science
- Physical Chemistry
- Spectroscopy
Background:
- Silver nanoclusters (NCs) are nanoscale materials with unique optical and electronic properties.
- Circularly polarized luminescence (CPL) is an important phenomenon in chiral materials, with applications in sensing and displays.
- Controlling the chirality and luminescence of nanomaterials is a key challenge in materials science.
Purpose of the Study:
- To investigate the relationship between ligand chirality and the CPL of silver nanoclusters.
- To synthesize silver nanoclusters capped with enantiomeric bidentate ligands.
- To characterize the CPL properties and determine the origin of optical activity.
Main Methods:
- Synthesis of silver nanoclusters using enantiomeric bidentate ligands.
- Characterization of nanocluster structure and optical properties.
- Measurement of circularly polarized luminescence (CPL) spectra and anisotropy factors.
Main Results:
- Silver nanoclusters exhibited mirror-image CPL spectra.
- An observed anisotropy factor of 0.2% indicates significant optical activity.
- The chirality of the bidentate ligand directly correlates with the induced CPL.
Conclusions:
- Enantiomeric bidentate ligands effectively induce chirality and CPL in silver nanoclusters.
- The ligand's chiral structure is the primary source of optical activity in the emissive state.
- This work provides a pathway for designing chiral nanomaterials with tailored luminescence.
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