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Issue 42, 2018
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A thirty-fold photoluminescence enhancement induced by secondary ligands in monolayer protected silver clusters

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Abstract

In this paper, we demonstrate that systematic replacement of the secondary ligand PPh3 leads to an enhancement in the near-infrared (NIR) photoluminescence (PL) of [Ag29(BDT)12(PPh3)4]3−. While the replacement of PPh3 with other monophosphines enhances luminescence slightly, the replacement with diphosphines of increasing chain length leads to a drastic PL enhancement, as high as 30 times compared to the parent cluster, [Ag29(BDT)12(PPh3)4]3−. Computational modeling suggests that the emission is a ligand to metal charge transfer (LMCT) which is affected by the nature of the secondary ligand. Control experiments with systematic replacement of the secondary ligand confirm its influence on the emission. The excited state dynamics shows this emission to be phosphorescent in nature which arises from the triplet excited state. This enhanced luminescence has been used to develop a prototypical O2 sensor. Moreover, a similar enhancement was also found for [Ag51(BDT)19(PPh3)3]3−. The work presents an easy approach to the PL enhancement of Ag clusters for various applications.

Graphical abstract: A thirty-fold photoluminescence enhancement induced by secondary ligands in monolayer protected silver clusters

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Publication details

The article was received on 25 Jul 2018, accepted on 28 Sep 2018 and first published on 02 Oct 2018


Article type: Paper
DOI: 10.1039/C8NR05989F
Citation: Nanoscale, 2018,10, 20033-20042
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    A thirty-fold photoluminescence enhancement induced by secondary ligands in monolayer protected silver clusters

    E. Khatun, A. Ghosh, P. Chakraborty, P. Singh, M. Bodiuzzaman, P. Ganesan, G. Nataranjan, J. Ghosh, S. K. Pal and T. Pradeep, Nanoscale, 2018, 10, 20033
    DOI: 10.1039/C8NR05989F

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