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Issue 5, 2016
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Tuning Ag29 nanocluster light emission from red to blue with one and two-photon excitation

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Abstract

We demonstrate that the tuning of the light emission from red to blue in dihydrolipoic acid (DHLA) capped Ag29 nanoclusters can be trigged with one and two photon excitations. The cluster stoichiometry was determined with mass spectrometry and found to be Ag29(DHLA)12. In a detailed optical investigation, we show that these silver nanoclusters exhibit a strong red photoluminescence visible to the naked eye and characterized by a quantum yield of nearly ∼2% upon one-photon excitation. In the nonlinear optical (NLO) study of the properties of the clusters, the two-photon excited fluorescence spectra were recorded and their first hyperpolarizability obtained. The two-photon absorption cross-section at ∼800 nm for Ag29(DHLA)12 is higher than 104 GM and the hyperpolarizability is 106 × 10−30 esu at the same excitation wavelength. The two-photon excited fluorescence spectrum appears strongly blue-shifted as compared to the one-photon excited spectrum, displaying a broad band between 400 and 700 nm. The density functional theory (DFT) provides insight into the structural and electronic properties of Ag29(DHLA)12 as well as into interplay between metallic subunit or core and ligands which is responsible for unique optical properties.

Graphical abstract: Tuning Ag29 nanocluster light emission from red to blue with one and two-photon excitation

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Publication details

The article was received on 17 Nov 2015, accepted on 09 Jan 2016 and first published on 11 Jan 2016


Article type: Paper
DOI: 10.1039/C5NR08122J
Citation: Nanoscale, 2016,8, 2892-2898
  • Open access: Creative Commons BY license
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    Tuning Ag29 nanocluster light emission from red to blue with one and two-photon excitation

    I. Russier-Antoine, F. Bertorelle, R. Hamouda, D. Rayane, P. Dugourd, Ž. Sanader, V. Bonačić-Koutecký, P. Brevet and R. Antoine, Nanoscale, 2016, 8, 2892
    DOI: 10.1039/C5NR08122J

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