Ultrabright Luminescence from Gold Nanoclusters: Rigidifying the Au(I)-Thiolate Shell

Kyunglim Pyo, Viraj Dhanushka Thanthirige, Kyuju Kwak, Prabhu Pandurangan, Guda Ramakrishna, Dongil Lee

Research output: Contribution to journalArticle

192 Citations (Scopus)

Abstract

Luminescent nanomaterials have captured the imagination of scientists for a long time and offer great promise for applications in organic/inorganic light-emitting displays, optoelectronics, optical sensors, biomedical imaging, and diagnostics. Atomically precise gold clusters with well-defined core-shell structures present bright prospects to achieve high photoluminescence efficiencies. In this study, gold clusters with a luminescence quantum yield greater than 60% were synthesized based on the Au22(SG)18 cluster, where SG is glutathione, by rigidifying its gold shell with tetraoctylammonium (TOA) cations. Time-resolved and temperature-dependent optical measurements on Au22(SG)18 have shown the presence of high quantum yield visible luminescence below freezing, indicating that shell rigidity enhances the luminescence quantum efficiency. To achieve high rigidity of the gold shell, Au22(SG)18 was bound to bulky TOA that resulted in greater than 60% quantum yield luminescence at room temperature. Optical measurements have confirmed that the rigidity of gold shell was responsible for the luminescence enhancement. This work presents an effective strategy to enhance the photoluminescence efficiencies of gold clusters by rigidifying the Au(I)-thiolate shell. (Graph Presented).

Original languageEnglish
Pages (from-to)8244-8250
Number of pages7
JournalJournal of the American Chemical Society
Volume137
Issue number25
DOIs
Publication statusPublished - 2015 Jul 1

Fingerprint

Nanoclusters
Luminescence
Gold
Quantum yield
Rigidity
Photoluminescence
Imagination
Temperature
Nanostructures
Optical sensors
Diagnostic Imaging
Quantum efficiency
Nanostructured materials
Freezing
Optoelectronic devices
Glutathione
Cations
Positive ions
Display devices
Imaging techniques

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Pyo, Kyunglim ; Thanthirige, Viraj Dhanushka ; Kwak, Kyuju ; Pandurangan, Prabhu ; Ramakrishna, Guda ; Lee, Dongil. / Ultrabright Luminescence from Gold Nanoclusters : Rigidifying the Au(I)-Thiolate Shell. In: Journal of the American Chemical Society. 2015 ; Vol. 137, No. 25. pp. 8244-8250.
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Ultrabright Luminescence from Gold Nanoclusters : Rigidifying the Au(I)-Thiolate Shell. / Pyo, Kyunglim; Thanthirige, Viraj Dhanushka; Kwak, Kyuju; Pandurangan, Prabhu; Ramakrishna, Guda; Lee, Dongil.

In: Journal of the American Chemical Society, Vol. 137, No. 25, 01.07.2015, p. 8244-8250.

Research output: Contribution to journalArticle

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