Energy-transfer from ultra-small Au nanoclusters to Er³⁺ ions: a short-range mechanism
Sub-nanometric Au nanoclusters are known to act as very efficient sensitizers for the luminescent emission of Er(3+) ions in silica through a non-resonant broad-band energy-transfer mechanism. In the present work the energy-transfer process is investigated in detail by room temperature photoluminesc...
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Veröffentlicht in: | Physical chemistry chemical physics : PCCP 2014-08, Vol.16 (29), p.15158-15163 |
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creator | Cesca, Tiziana Kalinic, Boris Michieli, Niccolò Maurizio, Chiara Scian, Carlo Devaraju, Gurram Battaglin, Giancarlo Mazzoldi, Paolo Mattei, Giovanni |
description | Sub-nanometric Au nanoclusters are known to act as very efficient sensitizers for the luminescent emission of Er(3+) ions in silica through a non-resonant broad-band energy-transfer mechanism. In the present work the energy-transfer process is investigated in detail by room temperature photoluminescence characterization of Er and Au co-implanted silica systems in which a different degree of coupling between Er(3+) ions and Au nanoclusters is obtained. The results allow us to definitely demonstrate the short-range nature of the interaction in agreement with non-radiative energy-transfer mechanisms. Moreover, an upper limit to the interaction length is also set by the Au-Au intercluster semi-distance which is smaller than 2.4 nm in the present case. |
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title | Energy-transfer from ultra-small Au nanoclusters to Er³⁺ ions: a short-range mechanism |
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