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Thirty-fold photoluminescence enhancement induced by secondary ligands in monolayer protected silver clusters

Abstract

In this paper, we demonstrate that systematic replacement of secondary ligand, PPh3 leads to enhancement in the nearinfrared (NIR) photoluminescence (PL) of [Ag29(BDT)12(PPh3)4]3-. While replacement of PPh3 with other monophosphines enhances luminescence slightly, replacement with diphosphines of increasing chain length leads to drastic PL enhancement, as high as 30 times than the parent cluster, [Ag29(BDT)12(PPh3)4]3-. Computational modelling 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 secondary ligand confirm the influence of it in the emission. The excited state dynamics shows this emission to be phosphorescence 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 is 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.

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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, Accepted Manuscript
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    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. Natarajan, J. Ghosh, S. K. Pal and T. Pradeep, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR05989F

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